/* ============================================
   COMPUTING SYSTEMS SIMULATION SITE
   ============================================ */

:root {
    --bg-dark: #0f172a;
    --bg-panel: #1e293b;
    --bg-card: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-blue: #3b82f6;
    --accent-green: #22c55e;
    --accent-red: #ef4444;
    --accent-yellow: #eab308;
    --accent-purple: #8b5cf6;
    --accent-orange: #f59e0b;
    --border: #374151;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow: 0 4px 20px rgba(0,0,0,0.3);
    --transition: 0.25s ease;
    --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
    font-family: var(--font);
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
}

/* ============ LAYOUT ============ */
.app {
    display: flex;
    min-height: 100vh;
}

/* ============ SIDEBAR ============ */
.sidebar {
    width: 280px;
    background: var(--bg-panel);
    border-right: 1px solid var(--border);
    padding: 20px 0;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: 100;
}

.sidebar-header {
    text-align: center;
    padding: 0 20px 20px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 20px;
}

.logo {
    font-size: 2.5rem;
    margin-bottom: 8px;
}

.sidebar-header h1 {
    font-size: 1.2rem;
    color: var(--accent-blue);
    margin-bottom: 4px;
}

.sidebar-header p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.nav-section {
    margin-bottom: 20px;
}

.nav-title {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    padding: 8px 20px;
    font-weight: 700;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 10px 20px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition);
    text-align: left;
    font-family: var(--font);
}

.nav-btn:hover {
    background: rgba(59, 130, 246, 0.1);
    color: var(--text-primary);
}

.nav-btn.active {
    background: rgba(59, 130, 246, 0.15);
    color: var(--accent-blue);
    border-left: 3px solid var(--accent-blue);
}

.nav-icon {
    font-size: 1.1rem;
}

/* ============ MAIN CONTENT ============ */
.main-content {
    flex: 1;
    margin-left: 280px;
    padding: 24px 30px;
    min-height: 100vh;
}

.section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.section-header {
    margin-bottom: 20px;
}

.section-header h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.section-desc {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* ============ BUTTONS ============ */
.btn-primary {
    background: var(--accent-blue);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    font-family: var(--font);
}

.btn-primary:hover {
    background: #2563eb;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 10px 20px;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    font-family: var(--font);
}

.btn-secondary:hover {
    background: var(--border);
}

.btn-large {
    padding: 14px 28px;
    font-size: 1.05rem;
}

/* ============ INPUT GROUPS ============ */
.input-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.input-group label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.input-group input,
.input-group select {
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px 14px;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-mono);
    outline: none;
    transition: border-color var(--transition);
}

.input-group input:focus,
.input-group select:focus {
    border-color: var(--accent-blue);
}

.input-group select {
    cursor: pointer;
}

/* ============ INFO CARDS ============ */
.info-card {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 16px;
    margin-top: 16px;
}

.info-card h3 {
    font-size: 1rem;
    color: var(--accent-blue);
    margin-bottom: 12px;
}

.info-card ul {
    list-style: none;
    padding-left: 0;
}

.info-card li {
    padding: 6px 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding-left: 20px;
    position: relative;
}

.info-card li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-blue);
}

.info-card.warning {
    border-color: var(--accent-orange);
}

.info-card.warning h3 {
    color: var(--accent-orange);
}

/* ============ BINARY CONVERTER ============ */
.converter-container {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
}

.converter-container .input-group {
    flex: 1;
}

.bit-display {
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    padding: 18px;
    text-align: center;
}

.bit-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.bits {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 12px;
}

.bit-group {
    display: flex;
    gap: 4px;
}

.bit {
    width: 44px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-dark);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-family: var(--font-mono);
    font-size: 1.4rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition);
    user-select: none;
}

.bit:hover {
    border-color: var(--accent-blue);
}

.bit.on {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    color: white;
}

.bit-weights {
    display: flex;
    justify-content: center;
    gap: 4px;
}

.bit-weights span {
    width: 44px;
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.bit-weights span:nth-child(4)::after {
    content: '';
    margin-right: 8px;
}

.explanation-box {
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    padding: 14px;
    margin-top: 14px;
}

.explanation-box h3 {
    font-size: 1rem;
    color: var(--accent-yellow);
    margin-bottom: 12px;
}

.explanation-box p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 6px;
}

.explanation-box code {
    font-family: var(--font-mono);
    background: var(--bg-dark);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--accent-green);
}

/* ============ BASE ARITHMETIC ============ */
.base-arith-container {
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    padding: 18px;
}

.base-arith-inputs {
    margin-bottom: 24px;
}

.base-arith-inputs .input-row {
    display: flex;
    gap: 16px;
    align-items: flex-end;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.base-arith-inputs .input-group {
    flex: 1;
    min-width: 120px;
}

.operator-select {
    flex: 0.5 !important;
    min-width: 100px !important;
}

.base-conversion-display {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.conversion-card {
    background: var(--bg-dark);
    border-radius: var(--radius);
    padding: 20px 30px;
    text-align: center;
    min-width: 140px;
    border: 2px solid var(--border);
}

.conversion-card .conv-header {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.conversion-card .conv-decimal {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-blue);
}

.conversion-card .conv-arrow {
    color: var(--text-muted);
    font-size: 1.2rem;
    margin: 8px 0;
}

.conversion-card .conv-base {
    font-family: var(--font-mono);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--accent-green);
    background: rgba(34, 197, 94, 0.1);
    padding: 8px 12px;
    border-radius: var(--radius);
}

.operator-card {
    background: transparent;
    border: none;
    min-width: 60px;
    padding: 20px 10px;
}

.operator-card .conv-operator {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-yellow);
}

.step-calc-container {
    background: var(--bg-dark);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 24px;
}

.step-calc-container h3 {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 1rem;
}

.step-calc-visual {
    font-family: var(--font-mono);
    font-size: 1.4rem;
    max-width: 500px;
    margin: 0 auto 20px;
}

.calc-carries {
    display: flex;
    justify-content: flex-end;
    gap: 0;
    padding-right: 10px;
    color: var(--accent-orange);
    font-size: 0.9rem;
    margin-bottom: 4px;
    min-height: 24px;
}

.calc-carries .carry {
    width: 28px;
    text-align: center;
}

.calc-row {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 8px 0;
}

.calc-label {
    width: 100px;
    text-align: right;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.calc-digits {
    display: flex;
    gap: 0;
}

.calc-digits .digit {
    width: 28px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 4px;
    margin: 0 1px;
    transition: all var(--transition);
}

.calc-digits .digit.highlight {
    background: rgba(59, 130, 246, 0.2);
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

.calc-digits.result .digit {
    background: rgba(34, 197, 94, 0.15);
    border-color: var(--accent-green);
    color: var(--accent-green);
    font-weight: 700;
}

.calc-line {
    height: 3px;
    background: var(--text-muted);
    margin: 8px 0;
    margin-left: 116px;
}

.calc-decimal-result {
    text-align: center;
    padding: 16px;
    background: var(--bg-panel);
    border-radius: var(--radius);
    font-size: 1.1rem;
}

.calc-decimal-result strong {
    color: var(--accent-yellow);
    font-family: var(--font-mono);
    font-size: 1.3rem;
    margin-left: 8px;
}

.step-explanation {
    background: var(--bg-dark);
    border-radius: var(--radius);
    padding: 24px;
}

.step-explanation h3 {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 1rem;
}

.step-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.step-item {
    display: flex;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-panel);
    border-radius: var(--radius);
    border-left: 4px solid var(--accent-purple);
}

.step-item .step-num {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-purple);
    border-radius: 50%;
    font-size: 0.85rem;
    font-weight: 700;
    flex-shrink: 0;
}

.step-item .step-content {
    flex: 1;
}

.step-item .step-calc {
    font-family: var(--font-mono);
    color: var(--accent-blue);
    margin-bottom: 4px;
}

.step-item .step-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.step-item .step-text .carry-note {
    color: var(--accent-orange);
    font-weight: 600;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
    margin-top: 12px;
}

.info-item {
    padding: 12px;
    background: var(--bg-dark);
    border-radius: var(--radius);
}

.info-item strong {
    color: var(--accent-blue);
    display: block;
    margin-bottom: 6px;
}

.info-item p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Conversion Explanation Section */
.conversion-explanation-section {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(59, 130, 246, 0.05));
    border: 2px solid var(--accent-purple);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 24px;
}

.conversion-explanation-section h3 {
    color: var(--accent-purple);
    margin-bottom: 8px;
    font-size: 1.1rem;
}

.conv-subtitle {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.conv-subtitle strong {
    color: var(--accent-yellow);
}

.conversion-demos {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.conv-demo-card {
    background: var(--bg-dark);
    border-radius: var(--radius);
    padding: 20px;
    border: 1px solid var(--border);
}

.conv-demo-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.conv-demo-title {
    font-weight: 600;
    color: var(--text-primary);
}

.conv-demo-formula {
    font-family: var(--font-mono);
    color: var(--accent-blue);
    font-size: 0.9rem;
    background: rgba(59, 130, 246, 0.1);
    padding: 4px 10px;
    border-radius: var(--radius);
}

.conv-demo-steps {
    margin-bottom: 16px;
}

.conv-step-row {
    display: grid;
    grid-template-columns: 1fr auto 60px auto 60px;
    gap: 8px;
    align-items: center;
    padding: 8px 12px;
    background: var(--bg-panel);
    border-radius: var(--radius);
    margin-bottom: 6px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.conv-step-row .division {
    color: var(--text-primary);
}

.conv-step-row .equals {
    color: var(--text-muted);
}

.conv-step-row .quotient {
    color: var(--accent-blue);
    text-align: center;
}

.conv-step-row .remainder-label {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.conv-step-row .remainder {
    color: var(--accent-green);
    font-weight: 700;
    text-align: center;
    background: rgba(34, 197, 94, 0.15);
    padding: 4px 8px;
    border-radius: 4px;
}

.conv-demo-result {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: rgba(234, 179, 8, 0.1);
    border: 1px dashed var(--accent-yellow);
    border-radius: var(--radius);
}

.conv-demo-result span {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.conv-demo-result strong {
    font-family: var(--font-mono);
    font-size: 1.4rem;
    color: var(--accent-yellow);
    letter-spacing: 2px;
}

.remainder-arrow {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 8px;
    color: var(--accent-yellow);
    font-size: 0.8rem;
}

.remainder-arrow::before {
    content: '↑';
    font-size: 1.2rem;
}

/* ============ TWO'S COMPLEMENT ============ */
.twos-container {
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.twos-container .input-group {
    flex-direction: row;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.twos-steps {
    margin-bottom: 24px;
}

.twos-step {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-dark);
    border-radius: var(--radius);
    margin-bottom: 8px;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-10px); }
    to { opacity: 1; transform: translateX(0); }
}

.twos-step-num {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-purple);
    border-radius: 50%;
    font-size: 0.85rem;
    font-weight: 700;
    flex-shrink: 0;
}

.twos-step-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.twos-visual {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.twos-row {
    display: flex;
    align-items: center;
    gap: 16px;
}

.twos-label {
    min-width: 200px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.twos-bits {
    display: flex;
    gap: 2px;
    font-family: var(--font-mono);
    font-size: 1.2rem;
    letter-spacing: 2px;
}

.twos-bits.highlight {
    color: var(--accent-green);
    font-weight: 700;
}

/* ============ OVERFLOW ============ */
.overflow-container {
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.overflow-inputs {
    display: flex;
    align-items: flex-end;
    gap: 16px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.operator {
    font-size: 1.5rem;
    color: var(--text-muted);
    padding-bottom: 8px;
}

.result-display {
    font-family: var(--font-mono);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-yellow);
    min-width: 60px;
    text-align: center;
}

.overflow-visual {
    background: var(--bg-dark);
    border-radius: var(--radius);
    padding: 20px;
    margin: 20px 0;
    font-family: var(--font-mono);
}

.binary-addition {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 4px;
    max-width: 200px;
    margin: 0 auto;
}

.add-row {
    font-size: 1.3rem;
    letter-spacing: 4px;
    color: var(--text-secondary);
}

.add-row.result {
    color: var(--accent-yellow);
    font-weight: 700;
}

.add-line {
    width: 100%;
    height: 2px;
    background: var(--border);
    margin: 4px 0;
}

.overflow-status {
    padding: 16px;
    border-radius: var(--radius);
    text-align: center;
    font-weight: 600;
}

.overflow-status.ok {
    background: rgba(34, 197, 94, 0.15);
    color: var(--accent-green);
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.overflow-status.error {
    background: rgba(239, 68, 68, 0.15);
    color: var(--accent-red);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.highlight { color: var(--accent-green); font-weight: 600; }
.danger { color: var(--accent-red); font-weight: 600; }

/* ============ LOGIC GATES ============ */
.gates-container {
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.gate-selector {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.gate-btn {
    padding: 10px 20px;
    background: var(--bg-dark);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    font-family: var(--font-mono);
}

.gate-btn:hover {
    border-color: var(--accent-blue);
}

.gate-btn.active {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
}

.gate-visual {
    display: flex;
    justify-content: center;
    background: var(--bg-dark);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 20px;
}

.gate-inputs {
    display: flex;
    gap: 24px;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
}

.gate-input-row,
.gate-output-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.toggle-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 1.4rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition);
    font-family: var(--font-mono);
    border: 3px solid var(--border);
    background: var(--bg-dark);
    color: var(--text-muted);
}

.toggle-btn[data-value="1"] {
    background: var(--accent-green);
    border-color: var(--accent-green);
    color: white;
}

.output-value {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 1.4rem;
    font-weight: 700;
    font-family: var(--font-mono);
    background: var(--bg-dark);
    border: 3px solid var(--accent-yellow);
    color: var(--accent-yellow);
}

.truth-table {
    background: var(--bg-dark);
    border-radius: var(--radius);
    overflow: hidden;
}

.truth-table table {
    width: 100%;
    border-collapse: collapse;
}

.truth-table th,
.truth-table td {
    padding: 10px 16px;
    text-align: center;
    font-family: var(--font-mono);
}

.truth-table th {
    background: var(--bg-card);
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.truth-table td {
    border-top: 1px solid var(--border);
}

.truth-table tr.selected {
    background: rgba(59, 130, 246, 0.15);
}

/* ============ ADDER CIRCUIT ============ */
.adder-container {
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.adder-controls {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
    align-items: flex-end;
}

.adder-circuit-svg {
    background: var(--bg-dark);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

.wire {
    stroke-linecap: round;
}

.adder-explanation {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.step {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: var(--bg-dark);
    border-radius: var(--radius);
    flex: 1;
    min-width: 250px;
}

.step-num {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-purple);
    border-radius: 50%;
    font-size: 0.85rem;
    font-weight: 700;
    flex-shrink: 0;
}

.step-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ============ LATCH ============ */
.latch-container {
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.latch-controls {
    display: flex;
    gap: 24px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.bit-toggle-group {
    display: flex;
    gap: 6px;
}

.bit-toggle {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-dark);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-family: var(--font-mono);
    font-size: 1.2rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition);
    color: var(--text-muted);
}

.bit-toggle.on {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    color: white;
}

.we-toggle {
    padding: 10px 20px;
    background: var(--bg-dark);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    color: var(--text-muted);
    font-family: var(--font);
}

.we-toggle.on {
    background: var(--accent-green);
    border-color: var(--accent-green);
    color: white;
}

.latch-visual {
    background: var(--bg-dark);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    justify-content: center;
    margin-bottom: 16px;
}

.latch-state-box {
    padding: 16px;
    background: var(--bg-dark);
    border-radius: var(--radius);
    color: var(--text-secondary);
}

/* ============ FETCH CYCLE ============ */
.fetch-container {
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.fetch-controls {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}

.fetch-datapath {
    background: var(--bg-dark);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    justify-content: center;
    overflow-x: auto;
    margin-bottom: 20px;
}

.fetch-log {
    background: var(--bg-dark);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 20px;
    max-height: 200px;
    overflow-y: auto;
}

.fetch-log h4 {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 12px;
}

.fetch-log ul {
    list-style: none;
}

.fetch-log li {
    padding: 6px 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
}

.fetch-log li:last-child {
    border-bottom: none;
}

.log-ready { color: var(--text-muted); }
.log-step { color: var(--accent-blue); }
.log-data { color: var(--accent-green); }
.log-done { color: var(--accent-yellow); font-weight: 600; }

.fetch-step-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.step-dot {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-dark);
    border: 2px solid var(--border);
    border-radius: 50%;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-muted);
    transition: all var(--transition);
}

.step-dot.active {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    color: white;
}

.step-dot.done {
    background: var(--accent-green);
    border-color: var(--accent-green);
    color: white;
}

.step-line {
    width: 40px;
    height: 3px;
    background: var(--border);
    border-radius: 2px;
}

.step-line.done {
    background: var(--accent-green);
}

/* ============ MEMORY INTERFACE ============ */
.memory-container {
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.memory-controls {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
    align-items: flex-end;
}

.memory-visual {
    display: flex;
    gap: 24px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.memory-registers {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.mem-reg {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-dark);
    border-radius: var(--radius);
    border: 2px solid var(--border);
}

.mem-reg-label {
    font-weight: 700;
    color: var(--accent-blue);
    min-width: 40px;
}

.mem-reg-value {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    color: var(--text-primary);
}

.memory-grid {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 8px;
    background: var(--bg-dark);
    border-radius: var(--radius);
    padding: 16px;
    max-height: 220px;
    overflow-y: auto;
}

.mem-cell {
    padding: 8px 12px;
    background: var(--bg-panel);
    border-radius: var(--radius);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    text-align: center;
    border: 1px solid var(--border);
    transition: all var(--transition);
}

.mem-cell.active {
    border-color: var(--accent-yellow);
    background: rgba(234, 179, 8, 0.1);
}

.mem-cell .addr {
    color: var(--text-muted);
    font-size: 0.75rem;
}

.mem-cell .val {
    color: var(--text-primary);
    font-weight: 600;
}

.memory-log {
    padding: 16px;
    background: var(--bg-dark);
    border-radius: var(--radius);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ============ LC3 DATAPATH ============ */
.lc3-container {
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.lc3-controls {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.lc3-datapath-svg {
    background: var(--bg-dark);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    justify-content: center;
    overflow-x: auto;
    margin-bottom: 20px;
}

.lc3-explanation {
    padding: 16px;
    background: var(--bg-dark);
    border-radius: var(--radius);
    color: var(--text-secondary);
}

/* ============ ADDRESSING MODES ============ */
.addr-container {
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.addr-selector {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.addr-btn {
    padding: 10px 20px;
    background: var(--bg-dark);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    font-family: var(--font);
}

.addr-btn:hover {
    border-color: var(--accent-blue);
}

.addr-btn.active {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
}

.addr-visual {
    background: var(--bg-dark);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    justify-content: center;
    overflow-x: auto;
    margin-bottom: 20px;
}

.addr-comparison {
    overflow-x: auto;
}

.addr-comparison table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-dark);
    border-radius: var(--radius);
    overflow: hidden;
}

.addr-comparison th,
.addr-comparison td {
    padding: 12px 16px;
    text-align: left;
}

.addr-comparison th {
    background: var(--bg-card);
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.addr-comparison td {
    border-top: 1px solid var(--border);
    font-size: 0.9rem;
}

.addr-comparison tr.active {
    background: rgba(59, 130, 246, 0.1);
}

.addr-comparison code {
    font-family: var(--font-mono);
    color: var(--accent-green);
}

/* ============ CONDITION CODES ============ */
.cc-container {
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.cc-input-area {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.cc-display {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 24px;
}

.cc-flag {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 30px;
    background: var(--bg-dark);
    border: 3px solid var(--border);
    border-radius: var(--radius-lg);
    transition: all var(--transition);
}

.cc-flag.active {
    border-color: var(--accent-green);
    background: rgba(34, 197, 94, 0.1);
}

.cc-flag.active.negative {
    border-color: var(--accent-red);
    background: rgba(239, 68, 68, 0.1);
}

.cc-label {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-muted);
}

.cc-flag.active .cc-label {
    color: var(--accent-green);
}

.cc-flag.active.negative .cc-label {
    color: var(--accent-red);
}

.cc-value {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    margin: 8px 0;
}

.cc-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.cc-explanation {
    padding: 16px;
    background: var(--bg-dark);
    border-radius: var(--radius);
    text-align: center;
    margin-bottom: 24px;
}

.cc-branch-test {
    padding: 20px;
    background: var(--bg-dark);
    border-radius: var(--radius);
}

.cc-branch-test h4 {
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.branch-results {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 12px;
}

.branch {
    padding: 8px 14px;
    border-radius: var(--radius);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-weight: 600;
}

.branch.taken {
    background: rgba(34, 197, 94, 0.15);
    color: var(--accent-green);
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.branch.not-taken {
    background: var(--bg-panel);
    color: var(--text-muted);
    border: 1px solid var(--border);
}

/* ============ CPU SIMULATOR ============ */
.cpu-simulator {
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.phase-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px 24px;
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(239, 68, 68, 0.1));
    border: 2px solid var(--accent-orange);
    border-radius: var(--radius-lg);
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.phase-label {
    color: var(--text-secondary);
    font-weight: 500;
}

.phase-name {
    color: var(--accent-orange);
    font-weight: 700;
    font-family: var(--font-mono);
    letter-spacing: 1px;
}

.phase-indicator.fetch .phase-name { color: var(--accent-blue); }
.phase-indicator.decode .phase-name { color: var(--accent-purple); }
.phase-indicator.execute .phase-name { color: var(--accent-green); }
.phase-indicator.halted .phase-name { color: var(--accent-red); }
.phase-indicator.halted { border-color: var(--accent-red); background: rgba(239, 68, 68, 0.1); }

.cpu-controls {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.btn-auto {
    padding: 14px 28px;
    background: var(--accent-purple);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-auto:hover { background: #7c3aed; transform: translateY(-2px); }
.btn-auto.running { background: var(--accent-orange); }

.btn-danger {
    padding: 14px 28px;
    background: var(--accent-red);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-danger:hover { background: #dc2626; transform: translateY(-2px); }

.cpu-layout {
    display: grid;
    grid-template-columns: 240px 1fr 220px;
    gap: 20px;
    margin-bottom: 20px;
}

.cpu-panel {
    background: var(--bg-dark);
    border-radius: var(--radius);
    padding: 16px;
    border: 1px solid var(--border);
}

.cpu-panel h3 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}

.registers-panel .register-box {
    background: var(--bg-panel);
    border-radius: var(--radius);
    padding: 12px;
    margin-bottom: 10px;
    border-left: 4px solid var(--border);
    transition: all var(--transition);
}

.registers-panel .register-box.active {
    border-left-color: var(--accent-yellow);
    background: rgba(234, 179, 8, 0.1);
    box-shadow: 0 0 20px rgba(234, 179, 8, 0.2);
}

#cpu-reg-r1 {
    border-left-color: #06b6d4;
}

#cpu-reg-r1.active {
    border-left-color: #06b6d4;
    background: rgba(6, 182, 212, 0.1);
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.2);
}

.reg-label {
    font-size: 0.85rem;
    color: var(--accent-blue);
    font-weight: 600;
    margin-bottom: 4px;
}

.reg-hint {
    color: var(--text-muted);
    font-size: 0.7rem;
    font-weight: 400;
}

.reg-value {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.datapath-panel {
    display: flex;
    flex-direction: column;
}

.datapath-panel svg {
    flex: 1;
}

.dp-component rect,
.dp-component polygon {
    transition: all var(--transition);
}

.dp-component.active rect,
.dp-component.active polygon {
    filter: drop-shadow(0 0 10px currentColor);
}

.memory-panel .memory-list {
    max-height: 280px;
    overflow-y: auto;
}

.mem-row {
    display: flex;
    justify-content: space-between;
    padding: 6px 10px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    border-bottom: 1px solid var(--border);
    transition: all var(--transition);
}

.mem-row:hover { background: var(--bg-panel); }

.mem-row.pc-target {
    background: rgba(59, 130, 246, 0.15);
    border-left: 3px solid var(--accent-blue);
}

.mem-row.mar-target {
    background: rgba(34, 197, 94, 0.15);
    border-left: 3px solid var(--accent-green);
}

.mem-addr { color: var(--text-muted); }
.mem-val { color: var(--text-primary); }
.mem-label { color: #f59e0b; font-weight: 600; font-size: 0.8rem; }
.mem-indicator { margin-left: 8px; }

.memory-legend {
    display: flex;
    gap: 16px;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.legend-color {
    width: 12px;
    height: 12px;
    border-radius: 3px;
}

.pc-color { background: var(--accent-blue); }
.mar-color { background: var(--accent-green); }

.cpu-log-panel {
    background: var(--bg-dark);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 20px;
    border: 1px solid var(--border);
}

.cpu-log-panel h3 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.cpu-log {
    max-height: 180px;
    overflow-y: auto;
    background: #0a0f1a;
    border-radius: var(--radius);
    padding: 12px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

.log-entry {
    padding: 6px 10px;
    border-radius: 4px;
    margin-bottom: 4px;
    border-left: 3px solid transparent;
}

.log-entry.log-fetch {
    color: var(--accent-blue);
    border-left-color: var(--accent-blue);
    background: rgba(59, 130, 246, 0.08);
}

.log-entry.log-decode {
    color: var(--accent-purple);
    border-left-color: var(--accent-purple);
    background: rgba(139, 92, 246, 0.08);
}

.log-entry.log-execute {
    color: var(--accent-green);
    border-left-color: var(--accent-green);
    background: rgba(34, 197, 94, 0.08);
}

.log-entry.log-info {
    color: var(--text-muted);
}

.log-entry.log-data {
    color: var(--accent-yellow);
    padding-left: 24px;
}

.log-entry.log-halt {
    color: var(--accent-red);
    border-left-color: var(--accent-red);
    background: rgba(239, 68, 68, 0.08);
    font-weight: 600;
}

.phase-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
}

.phase-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.phase-dot {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-dark);
    border: 3px solid var(--border);
    border-radius: 50%;
    font-weight: 700;
    color: var(--text-muted);
    transition: all var(--transition);
}

.phase-text {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    transition: all var(--transition);
}

.phase-step.active .phase-dot {
    border-color: currentColor;
    background: currentColor;
    color: var(--bg-dark);
    box-shadow: 0 0 20px currentColor;
}

.phase-step.done .phase-dot {
    border-color: var(--accent-green);
    color: var(--accent-green);
}

.phase-step.done .phase-text {
    color: var(--accent-green);
}

#phase-fetch.active .phase-dot { color: var(--accent-blue); background: var(--accent-blue); border-color: var(--accent-blue); }
#phase-fetch.active .phase-text { color: var(--accent-blue); }
#phase-decode.active .phase-dot { color: var(--accent-purple); background: var(--accent-purple); border-color: var(--accent-purple); }
#phase-decode.active .phase-text { color: var(--accent-purple); }
#phase-execute.active .phase-dot { color: var(--accent-green); background: var(--accent-green); border-color: var(--accent-green); }
#phase-execute.active .phase-text { color: var(--accent-green); }

.phase-line {
    width: 60px;
    height: 3px;
    background: var(--border);
    margin: 0 8px 24px;
    transition: all var(--transition);
}

.phase-line.done {
    background: var(--accent-green);
}

/* ============ HAMBURGER BUTTON ============ */
.hamburger {
    display: none;
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 200;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 8px 10px;
    cursor: pointer;
    flex-direction: column;
    gap: 4px;
}

.hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s;
}

.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(4px, -4px); }

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 90;
}

.sidebar-overlay.show {
    display: block;
}

/* ============ RESPONSIVE ============ */

/* Desktop compact */
@media (max-width: 1400px) {
    .main-content { padding: 20px 24px; }
    .section-header h2 { font-size: 1.4rem; }
}

@media (max-width: 1200px) {
    .cpu-layout {
        grid-template-columns: 200px 1fr 180px;
        gap: 12px;
    }
    .sidebar { width: 240px; }
    .main-content { margin-left: 240px; padding: 16px 20px; }
    .nav-btn { padding: 8px 14px; font-size: 0.82rem; }
    .sidebar-header h1 { font-size: 1rem; }
    .logo { font-size: 2rem; }
}

@media (max-width: 1024px) {
    .sidebar { width: 220px; }
    .main-content { margin-left: 220px; padding: 14px 16px; }
    .section-header { margin-bottom: 16px; }
    .section-header h2 { font-size: 1.2rem; margin-bottom: 4px; }
    .section-desc { font-size: 0.85rem; }
    .cpu-layout { grid-template-columns: 1fr; }
    .datapath-panel { order: -1; }
    .lc3-visual-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
    .conversion-card .conv-decimal { font-size: 1.4rem; }
    .conversion-card .conv-base { font-size: 1.1rem; }
    .conversion-card { padding: 14px 20px; min-width: 110px; }
}

/* Tablet */
@media (max-width: 768px) {
    .hamburger { display: flex; }

    .sidebar {
        position: fixed;
        left: -280px;
        width: 260px;
        transition: left 0.3s ease;
        z-index: 100;
    }
    .sidebar.open { left: 0; }

    .main-content {
        margin-left: 0;
        padding: 56px 12px 16px;
    }

    .section-header { margin-bottom: 12px; }
    .section-header h2 { font-size: 1.1rem; }
    .section-desc { font-size: 0.8rem; }

    /* Compact all containers */
    .converter-container { flex-direction: column; gap: 10px; }
    .base-arith-container,
    .twos-container,
    .overflow-container,
    .gates-container,
    .adder-container,
    .latch-container,
    .fetch-container,
    .memory-container,
    .lc3-container,
    .addr-container,
    .cc-container { padding: 14px; }

    .bit-display { padding: 14px; }
    .bit { width: 36px; height: 42px; font-size: 1.1rem; }
    .bit-weights span { width: 36px; font-size: 0.65rem; }

    .explanation-box { padding: 12px; margin-top: 12px; }
    .explanation-box h3 { font-size: 0.9rem; margin-bottom: 8px; }
    .explanation-box p { font-size: 0.85rem; }

    /* Base arithmetic */
    .base-arith-inputs .input-row { flex-direction: column; gap: 10px; }
    .base-conversion-display { flex-direction: column; gap: 12px; align-items: stretch; }
    .conversion-card { min-width: unset; padding: 12px; }
    .operator-card { padding: 8px 0; }
    .operator-card .conv-operator { font-size: 1.8rem; }
    .step-calc-container { padding: 14px; }
    .step-calc-visual { font-size: 1rem; }
    .calc-digits .digit { width: 22px; height: 28px; font-size: 0.85rem; }
    .calc-carries .carry { width: 22px; font-size: 0.75rem; }
    .calc-label { width: 70px; font-size: 0.75rem; }
    .step-item { padding: 8px 10px; gap: 8px; }

    /* Conversion explanation */
    .conversion-explanation-section { padding: 14px; }
    .conversion-demos { grid-template-columns: 1fr; }
    .conv-demo-card { padding: 12px; }
    .conv-step-row { grid-template-columns: 1fr auto 50px auto 50px; font-size: 0.8rem; gap: 4px; padding: 6px 8px; }

    /* Two's complement */
    .twos-container .input-group { flex-direction: column; gap: 8px; }
    .twos-row { flex-direction: column; gap: 6px; }
    .twos-label { min-width: unset; font-size: 0.8rem; }
    .twos-bits { font-size: 1rem; }

    /* Sign extension */
    .sext-controls { flex-direction: column; gap: 10px; }
    .sext-visual { padding: 16px; gap: 12px; }
    .sext-row { flex-direction: column; gap: 6px; }
    .sext-label { min-width: unset; font-size: 0.8rem; }
    .sext-bits .bit { width: 22px; height: 28px; font-size: 0.8rem; }

    /* Overflow */
    .overflow-inputs { flex-direction: column; gap: 10px; align-items: stretch; }
    .operator { text-align: center; padding: 0; }
    .result-display { font-size: 1.4rem; }
    .binary-addition { max-width: 160px; }
    .add-row { font-size: 1rem; letter-spacing: 2px; }

    /* DeMorgan */
    .demorgan-inputs { gap: 16px; }
    .toggle-btn { width: 42px; height: 34px; font-size: 1rem; }
    .demorgan-law { padding: 14px; }
    .demorgan-law h4 { font-size: 0.9rem; margin-bottom: 10px; }
    .law-equation { flex-direction: column; gap: 8px; }
    .law-side { min-width: unset; padding: 10px; }
    .law-formula { font-size: 0.9rem; padding: 6px; }
    .law-calc { font-size: 0.8rem; }
    .law-equals { font-size: 1.4rem; transform: rotate(90deg); padding: 4px 0; }
    .law-proof { font-size: 0.85rem; padding: 6px; margin-top: 8px; }
    .nand-universal { padding: 14px; }
    .nand-example { padding: 8px; gap: 8px; flex-wrap: wrap; }
    .nand-name { min-width: 80px; font-size: 0.8rem; }
    .nand-impl { font-size: 0.8rem; }

    /* Logic Gates */
    .gate-selector { gap: 4px; }
    .gate-btn { padding: 6px 12px; font-size: 0.8rem; }
    .gate-inputs { flex-direction: column; gap: 12px; }
    .toggle-btn { width: 42px; height: 42px; font-size: 1.1rem; }
    .output-value { width: 42px; height: 42px; font-size: 1.1rem; }
    .truth-table th, .truth-table td { padding: 6px 10px; font-size: 0.8rem; }

    /* SOP */
    .sop-container { grid-template-columns: 1fr; gap: 14px; }
    .sop-circuit-visual { grid-column: 1; }
    .sop-minterm-details { grid-column: 1; }
    .circuit-wrapper { flex-direction: column; gap: 14px; padding: 12px; }
    .circuit-and-gates { min-width: unset; }
    .and-gate-row { padding: 6px; gap: 4px; font-size: 0.8rem; }
    .truth-table-edit th, .truth-table-edit td { padding: 6px 8px; font-size: 0.8rem; }
    .minterm-cards { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 8px; }
    .minterm-card { padding: 10px; }

    /* Adder */
    .adder-controls { flex-direction: column; gap: 10px; }
    .adder-circuit-svg { padding: 10px; overflow-x: auto; }
    .adder-circuit-svg svg { max-width: 100%; height: auto; }

    /* Latch */
    .latch-controls { flex-direction: column; gap: 14px; }
    .bit-toggle { width: 36px; height: 36px; font-size: 1rem; }
    .latch-visual { padding: 12px; }

    /* Fetch */
    .fetch-controls { flex-wrap: wrap; gap: 8px; }
    .fetch-datapath { padding: 10px; }
    .step-dot { width: 26px; height: 26px; font-size: 0.75rem; }
    .step-line { width: 24px; }

    /* Memory */
    .memory-controls { flex-direction: column; gap: 10px; }
    .memory-visual { flex-direction: column; gap: 14px; }
    .memory-grid { grid-template-columns: repeat(auto-fill, minmax(90px, 1fr)); }

    /* LC-3 */
    .lc3-controls { flex-direction: column; gap: 10px; }
    .lc3-visual-grid { grid-template-columns: 1fr; gap: 14px; }
    .lc3-cc { grid-column: 1; }
    .lc3-selector-panel { flex-direction: column; gap: 10px; }
    .lc3-selector-panel .input-group { min-width: unset; }
    .lc3-info-body { grid-template-columns: 1fr; gap: 12px; }
    .lc3-info-header { flex-wrap: wrap; gap: 8px; }
    .binary-breakdown { gap: 2px; }
    .bin-part { padding: 4px 6px; font-size: 0.8rem; }

    /* Addressing modes */
    .addr-selector { gap: 4px; }
    .addr-btn { padding: 6px 12px; font-size: 0.8rem; }
    .addr-comparison th, .addr-comparison td { padding: 8px 10px; font-size: 0.8rem; }

    /* Condition codes */
    .cc-input-area { flex-direction: column; gap: 10px; }
    .cc-display { gap: 12px; }
    .cc-flag { padding: 12px 18px; }
    .cc-label { font-size: 1.4rem; }
    .cc-value { font-size: 1.1rem; }

    /* CPU Simulator */
    .cpu-layout { grid-template-columns: 1fr; gap: 12px; }
    .cpu-controls { gap: 8px; }
    .phase-indicator { font-size: 1rem; padding: 10px 16px; }
    .phase-dot { width: 32px; height: 32px; }
    .phase-line { width: 30px; }

    /* Info cards */
    .info-card { padding: 12px; margin-top: 14px; }
    .info-card h3 { font-size: 0.9rem; margin-bottom: 8px; }
    .info-card li { font-size: 0.8rem; }
    .info-grid { grid-template-columns: 1fr; gap: 8px; }

    /* Buttons */
    .btn-primary { padding: 8px 16px; font-size: 0.85rem; }
    .btn-large { padding: 10px 20px; font-size: 0.9rem; }
    .btn-secondary { padding: 8px 16px; font-size: 0.85rem; }

    /* Inputs */
    .input-group label { font-size: 0.78rem; }
    .input-group input, .input-group select { padding: 8px 10px; font-size: 0.9rem; }

    /* DeMorgan table */
    .demorgan-table th, .demorgan-table td { padding: 8px; font-size: 0.8rem; }

    /* CC table */
    .cc-update-table th, .cc-update-table td { padding: 8px; font-size: 0.8rem; }
    .cc-table-container { padding: 14px; }

    /* Bit-Byte Converter */
    .bitbyte-input-area { flex-direction: column; gap: 10px; }
    .bitbyte-input-area .input-group { min-width: unset; }
    .bb-results-grid { grid-template-columns: repeat(2, 1fr); }
    .chain-visual { gap: 6px; }
    .chain-item { padding: 8px 10px; }
    .chain-name { font-size: 0.85rem; }
    .chain-desc { font-size: 0.65rem; }
    .chain-arrow { font-size: 1rem; }
    .bitbyte-examples .example-cards { grid-template-columns: 1fr; }

    /* Bit Range Selector */
    .bitrange-input-area .input-row { flex-direction: column; }
    .br-label, .br-bit { width: 26px; height: 26px; font-size: 0.7rem; }
    .br-label { font-size: 0.6rem; }
    .br-selection-info { font-size: 1rem; }
    .br-result { font-size: 1.1rem; }
    .bitrange-display { padding: 16px 8px; }

    /* Decoder */
    .decoder-visual { flex-direction: column; padding: 20px; }
    .decoder-outputs { flex-direction: row; flex-wrap: wrap; gap: 4px; }
    .decoder-output { min-width: 60px; padding: 4px 10px; }
    .decoder-box { width: 100px; height: 100px; }
    .decoder-truth-table { overflow-x: auto; }
    .decoder-truth-table th, .decoder-truth-table td { padding: 4px 6px; font-size: 0.75rem; }

    /* MUX */
    .mux-visual { flex-direction: column; gap: 16px; padding: 20px; }
    .mux-visual-inputs { flex-direction: row; flex-wrap: wrap; gap: 6px; }
    .mux-vi { padding: 6px 10px; }
    .mux-box { width: 80px; height: 80px; }
    .mux-output-val { width: 50px; height: 50px; font-size: 2rem; }
    .mux-input-grid { gap: 12px; }
    .mux-truth-table th, .mux-truth-table td { padding: 6px 8px; font-size: 0.8rem; }

    /* R-S Latch */
    .rs-controls { gap: 16px; }
    .rs-output-box { padding: 12px 20px; }
    .rs-output-val { font-size: 1.5rem; }
    .rs-truth-table th, .rs-truth-table td { padding: 8px 10px; font-size: 0.8rem; }
}

/* Small phones */
@media (max-width: 480px) {
    .main-content { padding: 50px 8px 12px; }

    .section-header h2 { font-size: 1rem; }
    .section-desc { font-size: 0.75rem; }

    .bit { width: 32px; height: 38px; font-size: 1rem; }
    .bit-weights span { width: 32px; font-size: 0.6rem; }
    .bits { gap: 4px; }
    .bit-group { gap: 2px; }

    .sext-bits .bit { width: 18px; height: 24px; font-size: 0.7rem; }

    .toggle-btn { width: 36px; height: 30px; font-size: 0.9rem; }
    .demorgan-inputs { gap: 12px; }

    .gate-btn { padding: 5px 8px; font-size: 0.75rem; }

    .calc-digits .digit { width: 18px; height: 24px; font-size: 0.75rem; }
    .calc-carries .carry { width: 18px; font-size: 0.65rem; }
    .calc-label { width: 55px; font-size: 0.7rem; }

    .step-calc-visual { font-size: 0.85rem; }
    .conv-step-row { grid-template-columns: 1fr auto 40px auto 40px; font-size: 0.7rem; }

    .cc-display { flex-wrap: wrap; gap: 8px; }
    .cc-flag { padding: 10px 14px; }
    .cc-label { font-size: 1.1rem; }
    .cc-value { font-size: 0.9rem; }

    .lc3-opcode { font-size: 1rem; padding: 4px 10px; }
    .lc3-full-name { font-size: 0.9rem; }
    .bin-part { padding: 3px 4px; font-size: 0.7rem; }
    .bin-part::after { font-size: 0.55rem; }

    .truth-table-edit th, .truth-table-edit td { padding: 5px 6px; font-size: 0.75rem; }
    .and-gate-row { font-size: 0.7rem; }
    .and-input { padding: 2px 4px; font-size: 0.75rem; }

    .fetch-controls { gap: 4px; }
    .fetch-controls .btn-primary { padding: 6px 10px; font-size: 0.8rem; }

    .branch { padding: 5px 8px; font-size: 0.75rem; }

    /* Bit-Byte Converter */
    .bb-results-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
    .bb-result-card { padding: 10px; }
    .bb-result-value { font-size: 1.1rem; }
    .chain-visual { flex-direction: column; }
    .chain-arrow { transform: rotate(90deg); }

    /* Bit Range Selector */
    .br-label, .br-bit { width: 20px; height: 22px; font-size: 0.6rem; }
    .br-label { font-size: 0.5rem; }
    .br-selection-info { font-size: 0.85rem; flex-wrap: wrap; }

    /* Decoder */
    .decoder-output { min-width: 50px; font-size: 0.75rem; }
    .decoder-box { width: 80px; height: 80px; }
    .decoder-box-label { font-size: 0.9rem; }

    /* MUX */
    .mux-box { width: 70px; height: 70px; }
    .mux-box-label { font-size: 0.85rem; }
    .mux-output-val { width: 44px; height: 44px; font-size: 1.6rem; }

    /* R-S Latch */
    .rs-controls { flex-wrap: wrap; gap: 12px; }
    .rs-output-box { padding: 10px 16px; }
    .rs-output-val { font-size: 1.3rem; }
}

/* ============ SCROLLBAR ============ */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ============ LC-3 NEW DESIGN ============ */

/* ============ SIGN EXTENSION (SEXT) ============ */
.sext-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.sext-controls {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    align-items: flex-end;
}

.sext-visual {
    background: var(--bg-panel);
    padding: 20px;
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.sext-row {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.sext-label {
    min-width: 180px;
    color: var(--text-secondary);
}

.sext-bits {
    display: flex;
    gap: 2px;
    flex-wrap: wrap;
}

.sext-bits .bit {
    width: 28px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-weight: bold;
    transition: all 0.3s;
}

.sext-bits .bit.sign {
    background: var(--accent-red);
    color: white;
}

.sext-bits .bit.extended {
    background: var(--accent-purple);
    color: white;
    animation: pulse-extend 0.5s ease;
}

.sext-bits .bit.original {
    background: var(--accent-blue);
    color: white;
}

@keyframes pulse-extend {
    0% { transform: scale(0); opacity: 0; }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); opacity: 1; }
}

.sext-arrow {
    text-align: center;
    font-size: 1.2rem;
    color: var(--accent-green);
    padding: 10px;
}

.sext-decimal {
    color: var(--text-muted);
    font-style: italic;
}

.sext-explanation {
    background: rgba(139, 92, 246, 0.1);
    border: 1px solid var(--accent-purple);
    padding: 16px;
    border-radius: var(--radius);
}

.sext-explanation p {
    margin: 4px 0;
}

.highlight-text {
    margin-top: 12px;
    padding: 10px;
    background: rgba(234, 179, 8, 0.2);
    border-radius: var(--radius);
    color: var(--accent-yellow);
}

/* ============ DEMORGAN LAW ============ */
.demorgan-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.demorgan-inputs {
    display: flex;
    gap: 24px;
    justify-content: center;
    flex-wrap: wrap;
}

.toggle-buttons {
    display: flex;
    gap: 8px;
}

.toggle-btn {
    width: 50px;
    height: 40px;
    border: 2px solid var(--border);
    background: var(--bg-panel);
    color: var(--text-secondary);
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
}

.toggle-btn:hover {
    border-color: var(--accent-blue);
}

.toggle-btn.active {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    color: white;
}

.demorgan-laws {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.demorgan-law {
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    padding: 18px;
}

.demorgan-law h4 {
    margin-bottom: 16px;
    color: var(--accent-purple);
}

.law-equation {
    display: flex;
    align-items: stretch;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

.law-side {
    flex: 1;
    min-width: 200px;
    background: var(--bg-dark);
    padding: 16px;
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.law-title {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.law-formula {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    color: var(--accent-blue);
    padding: 8px;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 4px;
    text-align: center;
}

.law-calc {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.law-calc .result {
    color: var(--accent-green);
    font-size: 1.2rem;
}

.law-equals {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--accent-yellow);
    font-weight: bold;
}

.law-proof {
    text-align: center;
    margin-top: 12px;
    padding: 8px;
    background: rgba(34, 197, 94, 0.2);
    color: var(--accent-green);
    border-radius: var(--radius);
    font-weight: bold;
}

.nand-universal {
    background: var(--bg-panel);
    padding: 24px;
    border-radius: var(--radius-lg);
    border: 2px solid var(--accent-orange);
}

.nand-universal h4 {
    color: var(--accent-orange);
    margin-bottom: 12px;
}

.nand-examples {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 16px;
}

.nand-example {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px;
    background: var(--bg-dark);
    border-radius: var(--radius);
}

.nand-name {
    min-width: 100px;
    font-family: var(--font-mono);
    color: var(--accent-blue);
}

.nand-eq {
    color: var(--text-muted);
}

.nand-impl {
    font-family: var(--font-mono);
    color: var(--accent-orange);
}

.demorgan-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 12px;
}

.demorgan-table th,
.demorgan-table td {
    padding: 12px;
    border: 1px solid var(--border);
    text-align: left;
}

.demorgan-table th {
    background: var(--bg-panel);
    color: var(--accent-purple);
}

.demorgan-table code {
    background: var(--bg-dark);
    padding: 4px 8px;
    border-radius: 4px;
    font-family: var(--font-mono);
}

/* ============ CC UPDATE TABLE ============ */

/* ============ SOP CIRCUIT SIMULATOR ============ */
.sop-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.sop-truth-table,
.sop-test-panel,
.sop-circuit-visual,
.sop-minterm-details {
    background: var(--bg-panel);
    padding: 24px;
    border-radius: var(--radius-lg);
}

.sop-truth-table h3,
.sop-test-panel h3,
.sop-circuit-visual h3,
.sop-minterm-details h3 {
    margin-bottom: 16px;
    color: var(--accent-blue);
}

.sop-hint {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

/* Truth Table */
.truth-table-edit {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-mono);
}

.truth-table-edit th,
.truth-table-edit td {
    padding: 10px 12px;
    text-align: center;
    border: 1px solid var(--border);
}

.truth-table-edit th {
    background: var(--bg-dark);
    color: var(--accent-purple);
}

.truth-table-edit tr {
    cursor: pointer;
    transition: all 0.2s;
}

.truth-table-edit tr:hover {
    background: rgba(59, 130, 246, 0.1);
}

.truth-table-edit tr.active {
    background: rgba(34, 197, 94, 0.2);
}

.truth-table-edit tr.active .output-cell {
    color: var(--accent-green);
    font-weight: bold;
    font-size: 1.1rem;
}

.truth-table-edit tr.current {
    outline: 2px solid var(--accent-yellow);
    outline-offset: -2px;
}

.sop-expression {
    margin-top: 16px;
    padding: 12px;
    background: var(--bg-dark);
    border-radius: var(--radius);
    font-family: var(--font-mono);
}

.sop-expression code {
    color: var(--accent-green);
    font-size: 1rem;
    word-break: break-word;
}

/* Test Panel */
.sop-test-inputs {
    display: flex;
    gap: 24px;
    justify-content: center;
    margin-bottom: 20px;
}

.sop-input-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.sop-input-group label {
    font-weight: bold;
    font-size: 1.2rem;
    color: var(--accent-purple);
}

.sop-test-result {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px;
    background: var(--bg-dark);
    border-radius: var(--radius);
    font-size: 1.1rem;
}

.sop-test-result .arrow {
    color: var(--accent-yellow);
    font-size: 1.5rem;
}

.sop-test-result .output-1 {
    color: var(--accent-green);
    font-size: 1.5rem;
}

.sop-test-result .output-0 {
    color: var(--accent-red);
    font-size: 1.5rem;
}

/* Circuit Visualization */
.sop-circuit-visual {
    grid-column: 1 / -1;
}

.circuit-wrapper {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 20px;
    background: var(--bg-dark);
    border-radius: var(--radius);
    overflow-x: auto;
}

.circuit-inputs {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.wire-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.wire-label {
    font-weight: bold;
    font-family: var(--font-mono);
    min-width: 20px;
    color: var(--accent-purple);
}

.wire {
    width: 50px;
    height: 30px;
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-weight: bold;
    transition: all 0.3s;
}

.wire.active {
    background: var(--accent-green);
    border-color: var(--accent-green);
    color: white;
    box-shadow: 0 0 10px rgba(34, 197, 94, 0.5);
}

.wire.inactive {
    background: var(--bg-card);
    border-color: var(--border);
    color: var(--text-muted);
}

.wire.inverted {
    border-style: dashed;
}

.wire.inverted.active {
    background: var(--accent-purple);
    border-color: var(--accent-purple);
}

.not-gate {
    background: var(--accent-red);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: bold;
}

.not-gate.used {
    box-shadow: 0 0 10px rgba(239, 68, 68, 0.5);
    animation: pulse-gate 0.5s ease;
}

@keyframes pulse-gate {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* AND Gates */
.circuit-and-gates {
    display: flex;
    flex-direction: column;
    gap: 12px;
    min-width: 280px;
}

.and-gate-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px;
    background: var(--bg-panel);
    border-radius: var(--radius);
    border: 2px solid var(--border);
    transition: all 0.3s;
}

.and-gate-row.active {
    border-color: var(--accent-green);
    box-shadow: 0 0 15px rgba(34, 197, 94, 0.3);
}

.and-gate-inputs {
    display: flex;
    gap: 4px;
}

.and-input {
    padding: 4px 8px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-weight: bold;
}

.and-input.normal {
    background: var(--accent-blue);
    color: white;
}

.and-input.inverted {
    background: var(--accent-purple);
    color: white;
}

.and-input.active {
    box-shadow: 0 0 8px currentColor;
}

.and-input.contributing {
    animation: pulse-input 0.5s ease;
}

@keyframes pulse-input {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

.and-gate-symbol {
    background: var(--accent-orange);
    color: white;
    padding: 6px 12px;
    border-radius: 4px;
    font-weight: bold;
}

.and-gate-output {
    font-family: var(--font-mono);
    font-weight: bold;
    padding: 4px 12px;
    border-radius: 4px;
    background: var(--bg-dark);
}

.and-gate-output.out-1 {
    color: var(--accent-green);
}

.and-gate-output.out-0 {
    color: var(--text-muted);
}

.and-gate-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-left: auto;
}

/* OR Gate */
.circuit-or-gate {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.or-gate {
    background: var(--accent-yellow);
    color: black;
    padding: 20px 30px;
    border-radius: var(--radius);
    font-weight: bold;
    font-size: 1.2rem;
    transition: all 0.3s;
}

.or-gate.active {
    box-shadow: 0 0 20px rgba(234, 179, 8, 0.5);
}

.final-output {
    display: flex;
    align-items: center;
    gap: 8px;
}

.final-output .wire.output {
    width: 60px;
    height: 40px;
    font-size: 1.3rem;
}

/* Legend */
.circuit-legend {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.legend-wire {
    width: 24px;
    height: 16px;
    border-radius: 3px;
    border: 2px solid;
}

.legend-wire.active {
    background: var(--accent-green);
    border-color: var(--accent-green);
}

.legend-wire.inactive {
    background: var(--bg-card);
    border-color: var(--border);
}

.legend-wire.inverted {
    background: var(--accent-purple);
    border-color: var(--accent-purple);
    border-style: dashed;
}

/* Minterm Details */
.sop-minterm-details {
    grid-column: 1 / -1;
}

.minterm-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.minterm-card {
    background: var(--bg-dark);
    padding: 16px;
    border-radius: var(--radius);
    border: 2px solid var(--border);
    transition: all 0.3s;
}

.minterm-card.active {
    border-color: var(--accent-green);
    background: rgba(34, 197, 94, 0.1);
}

.minterm-card .minterm-title {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    color: var(--accent-blue);
    margin-bottom: 8px;
}

.minterm-card .minterm-binary {
    font-family: var(--font-mono);
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.minterm-card .minterm-formula {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

.minterm-card .term {
    padding: 2px 6px;
    border-radius: 3px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
}

.minterm-card .term.normal {
    background: var(--accent-blue);
    color: white;
}

.minterm-card .term.inverted {
    background: var(--accent-purple);
    color: white;
}

/* Responsive handled in main responsive section */

/* ============ CC UPDATE TABLE ============ */
.cc-table-container {
    margin-top: 24px;
    background: var(--bg-panel);
    padding: 24px;
    border-radius: var(--radius-lg);
}

.cc-table-container h3 {
    margin-bottom: 16px;
    color: var(--accent-yellow);
}

.cc-update-table {
    width: 100%;
    border-collapse: collapse;
}

.cc-update-table th,
.cc-update-table td {
    padding: 12px;
    border: 1px solid var(--border);
    text-align: left;
}

.cc-update-table th {
    background: var(--bg-dark);
    color: var(--text-primary);
}

.cc-update-table tr.updates-cc {
    background: rgba(34, 197, 94, 0.1);
}

.cc-update-table tr.updates-cc td:first-child {
    color: var(--accent-green);
}

.cc-update-table tr.no-update {
    background: rgba(239, 68, 68, 0.1);
}

.cc-update-table tr.no-update td:first-child {
    color: var(--accent-red);
}

.cc-update-table tr.special {
    background: rgba(245, 158, 11, 0.1);
}

.cc-update-table tr.special td:first-child {
    color: var(--accent-orange);
}

.cc-rule-highlight {
    margin-top: 16px;
    padding: 16px;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid var(--accent-blue);
    border-radius: var(--radius);
}

.cc-rule-highlight p {
    margin: 8px 0;
}

/* ============ LC-3 NEW DESIGN ============ */
.lc3-new-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.lc3-selector-panel {
    display: flex;
    gap: 16px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.lc3-selector-panel .input-group {
    flex: 1;
    min-width: 250px;
}

.lc3-selector-panel .btn-large {
    padding: 14px 28px;
    font-size: 1.1rem;
}

/* Info Card */
.lc3-info-card {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    border: 2px solid var(--accent-blue);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.2);
}

.lc3-info-header {
    background: var(--accent-blue);
    padding: 12px 20px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.lc3-opcode {
    background: rgba(255,255,255,0.2);
    padding: 6px 16px;
    border-radius: 4px;
    font-weight: bold;
    font-size: 1.2rem;
    font-family: var(--font-mono);
}

.lc3-full-name {
    font-size: 1.1rem;
    font-family: var(--font-mono);
}

.lc3-info-body {
    padding: 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.lc3-meaning {
    grid-column: 1 / -1;
}

.lc3-meaning p {
    margin-top: 8px;
    font-size: 1.1rem;
    color: var(--text-primary);
    line-height: 1.6;
}

.lc3-formula {
    background: var(--bg-panel);
    padding: 16px;
    border-radius: var(--radius);
    border-left: 3px solid var(--accent-green);
}

.lc3-formula code {
    display: block;
    margin-top: 8px;
    font-size: 1.3rem;
    color: var(--accent-green);
    font-family: var(--font-mono);
}

.lc3-binary {
    background: var(--bg-panel);
    padding: 16px;
    border-radius: var(--radius);
    border-left: 3px solid var(--accent-purple);
}

.binary-breakdown {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: 12px;
}

.bin-part {
    padding: 6px 10px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 1rem;
    position: relative;
    transition: all 0.3s;
}

.bin-part::after {
    content: attr(data-label);
    position: absolute;
    bottom: -18px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.65rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.bin-part.opcode { background: #8b5cf6; color: white; }
.bin-part.dr { background: #3b82f6; color: white; }
.bin-part.sr1 { background: #22c55e; color: white; }
.bin-part.sr2 { background: #f59e0b; color: black; }
.bin-part.mode { background: #ef4444; color: white; }
.bin-part.unused { background: #374151; color: #6b7280; }
.bin-part.offset { background: #06b6d4; color: white; }
.bin-part.imm { background: #ec4899; color: white; }

.bin-part.active {
    transform: scale(1.15);
    box-shadow: 0 0 10px currentColor;
}

/* Visual Execution */
.lc3-execution-visual {
    background: var(--bg-panel);
    padding: 24px;
    border-radius: var(--radius-lg);
}

.lc3-execution-visual h3 {
    margin-bottom: 20px;
    color: var(--accent-yellow);
}

.lc3-visual-grid {
    display: grid;
    grid-template-columns: 180px 1fr 180px;
    gap: 24px;
    align-items: start;
}

.lc3-component {
    background: var(--bg-dark);
    border-radius: var(--radius);
    padding: 16px;
    border: 1px solid var(--border);
}

.comp-title {
    font-weight: bold;
    text-align: center;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
}

/* Registers */
.lc3-registers {
    border-color: var(--accent-blue);
}

.lc3-registers .comp-title {
    color: var(--accent-blue);
}

.reg-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.reg-item {
    display: flex;
    justify-content: space-between;
    padding: 6px 10px;
    background: var(--bg-panel);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    transition: all 0.3s;
}

.reg-item.source {
    background: var(--accent-green);
    color: white;
    box-shadow: 0 0 10px rgba(34, 197, 94, 0.5);
}

.reg-item.dest {
    background: var(--accent-blue);
    color: white;
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.5);
}

.reg-item.dest.writing {
    animation: pulse-write 0.5s ease;
}

@keyframes pulse-write {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.reg-val {
    color: var(--text-muted);
}

.reg-item.source .reg-val,
.reg-item.dest .reg-val {
    color: inherit;
}

/* Dataflow */
.lc3-dataflow {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: var(--bg-dark);
    border-radius: var(--radius);
    border: 2px dashed var(--border);
    min-height: 300px;
    justify-content: center;
}

.flow-step {
    display: flex;
    align-items: center;
    gap: 12px;
    opacity: 0.3;
    transform: translateX(-20px);
    transition: all 0.5s;
}

.flow-step.active {
    opacity: 1;
    transform: translateX(0);
}

.flow-arrow {
    font-size: 2rem;
    color: var(--accent-green);
}

.flow-data {
    background: var(--accent-blue);
    color: white;
    padding: 12px 20px;
    border-radius: var(--radius);
    font-family: var(--font-mono);
    font-size: 1.2rem;
    min-width: 80px;
    text-align: center;
}

.flow-data.result {
    background: var(--accent-purple);
    font-size: 1.4rem;
}

.flow-label {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.flow-operation {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--accent-green);
    color: white;
    padding: 16px 24px;
    border-radius: 50%;
    opacity: 0.3;
    transform: scale(0.8);
    transition: all 0.5s;
}

.flow-operation.active {
    opacity: 1;
    transform: scale(1);
    box-shadow: 0 0 20px rgba(34, 197, 94, 0.5);
}

.op-symbol {
    font-size: 2rem;
    font-weight: bold;
    line-height: 1;
}

.op-name {
    font-size: 0.8rem;
    margin-top: 4px;
}

.flow-result {
    display: flex;
    align-items: center;
    gap: 12px;
    opacity: 0.3;
    transition: all 0.5s;
}

.flow-result.active {
    opacity: 1;
}

.flow-writeback {
    display: flex;
    align-items: center;
    gap: 12px;
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.5s;
}

.flow-writeback.active {
    opacity: 1;
    transform: translateY(0);
}

.flow-writeback .flow-data.writeback {
    background: var(--accent-blue);
    font-weight: bold;
    padding: 10px 20px;
    border-radius: var(--radius);
    font-family: var(--font-mono);
    font-size: 1.1rem;
    color: white;
    box-shadow: 0 0 16px rgba(59, 130, 246, 0.5);
    animation: pulseBlue 1s ease-in-out 2;
}

@keyframes pulseBlue {
    0%, 100% { box-shadow: 0 0 16px rgba(59, 130, 246, 0.5); }
    50% { box-shadow: 0 0 28px rgba(59, 130, 246, 0.8); }
}

.flow-writeback .flow-label {
    color: var(--accent-blue);
    font-weight: 600;
    font-size: 1rem;
}

.flow-writeback .flow-arrow {
    color: var(--accent-blue);
    font-size: 1.5rem;
}

/* Memory */
.lc3-memory {
    border-color: var(--accent-red);
    display: none;
}

.lc3-memory.visible {
    display: block;
}

.lc3-memory .comp-title {
    color: var(--accent-red);
}

.mem-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.mem-item {
    padding: 8px;
    background: var(--bg-panel);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.mem-item.highlight {
    background: var(--accent-red);
    color: white;
}

.mem-item.reading {
    animation: mem-read 0.5s ease;
}

.mem-item.writing {
    animation: mem-write 0.5s ease;
}

@keyframes mem-read {
    0%, 100% { box-shadow: none; }
    50% { box-shadow: 0 0 15px var(--accent-green); }
}

@keyframes mem-write {
    0%, 100% { box-shadow: none; }
    50% { box-shadow: 0 0 15px var(--accent-red); }
}

/* Condition Codes */
.lc3-cc {
    border-color: var(--accent-yellow);
    grid-column: 2;
    justify-self: center;
}

.lc3-cc .comp-title {
    color: var(--accent-yellow);
}

.cc-flags {
    display: flex;
    gap: 8px;
    justify-content: center;
}

.cc-flag {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-panel);
    border-radius: 50%;
    font-weight: bold;
    font-size: 1.1rem;
    color: var(--text-muted);
    transition: all 0.3s;
}

.cc-flag.active {
    background: var(--accent-yellow);
    color: black;
    box-shadow: 0 0 10px var(--accent-yellow);
}

/* Steps Panel */
.lc3-steps-panel {
    background: var(--bg-panel);
    padding: 24px;
    border-radius: var(--radius-lg);
}

.lc3-steps-panel h3 {
    margin-bottom: 16px;
    color: var(--accent-orange);
}

.lc3-steps-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.lc3-step {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 16px;
    background: var(--bg-dark);
    border-radius: var(--radius);
    border-left: 3px solid var(--border);
    opacity: 0.5;
    transition: all 0.3s;
}

.lc3-step.current {
    opacity: 1;
    border-left-color: var(--accent-orange);
    background: rgba(245, 158, 11, 0.1);
}

.lc3-step.done {
    opacity: 0.7;
    border-left-color: var(--accent-green);
}

.step-num {
    background: var(--border);
    color: white;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.lc3-step.current .step-num {
    background: var(--accent-orange);
}

.lc3-step.done .step-num {
    background: var(--accent-green);
}

.step-text {
    line-height: 1.5;
}

/* ============ BIT-BYTE CONVERTER ============ */
.bitbyte-container { display: flex; flex-direction: column; gap: 24px; }
.bitbyte-input-area {
    display: flex; gap: 16px; align-items: flex-end; flex-wrap: wrap;
}
.bitbyte-input-area .input-group { flex: 1; min-width: 120px; }

.bb-results-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 12px;
}
.bb-result-card {
    background: var(--bg-card); border-radius: var(--radius); padding: 16px; text-align: center;
    border: 2px solid transparent; transition: var(--transition);
}
.bb-result-card.active { border-color: var(--accent-blue); background: rgba(59,130,246,0.1); }
.bb-result-value { font-size: 1.4rem; font-weight: 700; color: var(--text-primary); }
.bb-result-unit { font-size: 0.8rem; color: var(--text-secondary); margin-top: 4px; }
.bb-result-calc { font-size: 0.75rem; color: var(--accent-green); margin-top: 6px; }

.chain-visual {
    display: flex; align-items: center; gap: 8px; flex-wrap: wrap; justify-content: center;
    padding: 20px; background: var(--bg-card); border-radius: var(--radius);
}
.chain-item {
    display: flex; flex-direction: column; align-items: center; padding: 12px 16px;
    background: var(--bg-panel); border-radius: var(--radius); border: 1px solid var(--border);
}
.chain-name { font-weight: 700; color: var(--accent-blue); }
.chain-desc { font-size: 0.75rem; color: var(--text-muted); }
.chain-arrow { font-size: 1.2rem; font-weight: 700; color: var(--accent-orange); }

.bitbyte-examples .example-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.example-card {
    background: var(--bg-card); border-radius: var(--radius); padding: 14px;
    border-left: 3px solid var(--accent-purple);
}
.example-q { color: var(--text-secondary); margin-bottom: 6px; font-size: 0.9rem; }
.example-a { color: var(--accent-green); font-size: 0.95rem; }

/* ============ BIT RANGE SELECTOR ============ */
.bitrange-container { display: flex; flex-direction: column; gap: 24px; }
.bitrange-input-area { display: flex; flex-direction: column; gap: 12px; }
.bitrange-input-area .input-row { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; }
.bitrange-input-area .input-group { flex: 1; min-width: 100px; }

.bitrange-display {
    background: var(--bg-card); border-radius: var(--radius-lg); padding: 24px; text-align: center;
}
.br-full-number { overflow-x: auto; }
.br-bit-labels, .br-bits {
    display: flex; justify-content: center; gap: 2px;
}
.br-label, .br-bit {
    width: 32px; height: 32px; display: flex; align-items: center; justify-content: center;
    font-family: var(--font-mono); font-size: 0.85rem; border-radius: 4px;
}
.br-label { color: var(--text-muted); font-size: 0.7rem; }
.br-label.selected { color: var(--accent-orange); font-weight: 700; }
.br-bit {
    background: var(--bg-panel); color: var(--text-secondary); border: 1px solid var(--border);
}
.br-bit.selected {
    background: rgba(245,158,11,0.2); color: var(--accent-orange);
    border-color: var(--accent-orange); font-weight: 700;
}
.br-selection-info {
    display: flex; align-items: center; justify-content: center; gap: 12px;
    margin-top: 16px; font-size: 1.2rem;
}
.br-notation { color: var(--accent-blue); font-weight: 700; font-family: var(--font-mono); }
.br-equals { color: var(--text-muted); }
.br-result { color: var(--accent-orange); font-weight: 700; font-family: var(--font-mono); font-size: 1.4rem; }

.bitrange-explanation {
    background: var(--bg-card); border-radius: var(--radius); padding: 16px;
}
.bitrange-explanation code { padding: 2px 6px; background: var(--bg-dark); border-radius: 4px; font-family: var(--font-mono); }
.bitrange-explanation code.highlight { color: var(--accent-orange); }

/* ============ DECODER ============ */
.decoder-container { display: flex; flex-direction: column; gap: 24px; }
.decoder-inputs-area {
    background: var(--bg-card); border-radius: var(--radius); padding: 20px;
}
.decoder-input-toggles { display: flex; gap: 20px; margin: 12px 0; }
.decoder-input-toggle { display: flex; align-items: center; gap: 8px; }
.decoder-input-toggle label { font-weight: 700; color: var(--accent-blue); }
.decoder-input-binary {
    margin-top: 8px; color: var(--text-secondary); font-family: var(--font-mono);
}

.decoder-visual {
    display: flex; align-items: center; gap: 24px; justify-content: center;
    background: var(--bg-card); border-radius: var(--radius-lg); padding: 30px;
}
.decoder-box {
    width: 120px; height: 180px; background: var(--bg-dark); border: 3px solid var(--accent-purple);
    border-radius: var(--radius); display: flex; flex-direction: column;
    align-items: center; justify-content: center; gap: 4px;
}
.decoder-box-label { font-weight: 700; color: var(--accent-purple); font-size: 1.1rem; }
.decoder-box-sublabel { font-size: 0.85rem; color: var(--text-muted); }
.decoder-outputs {
    display: flex; flex-direction: column; gap: 6px;
}
.decoder-output {
    display: flex; align-items: center; gap: 10px; padding: 6px 14px;
    background: var(--bg-panel); border-radius: 4px; border: 1px solid var(--border);
    transition: var(--transition); min-width: 100px;
}
.decoder-output.active {
    background: rgba(34,197,94,0.15); border-color: var(--accent-green);
}
.do-label { font-size: 0.85rem; color: var(--text-muted); min-width: 28px; }
.do-val { font-weight: 700; font-family: var(--font-mono); color: var(--text-secondary); }
.decoder-output.active .do-val { color: var(--accent-green); font-size: 1.1rem; }

.decoder-truth-table table { width: 100%; border-collapse: collapse; }
.decoder-truth-table th, .decoder-truth-table td {
    padding: 6px 10px; text-align: center; border: 1px solid var(--border);
    font-family: var(--font-mono); font-size: 0.85rem;
}
.decoder-truth-table th { background: var(--bg-card); color: var(--text-secondary); }
.decoder-truth-table tr.selected { background: rgba(59,130,246,0.1); }
.decoder-truth-table td.out-1 { color: var(--accent-green); font-weight: 700; }

/* ============ MUX ============ */
.mux-container { display: flex; flex-direction: column; gap: 24px; }
.mux-data-inputs, .mux-selector-area {
    background: var(--bg-card); border-radius: var(--radius); padding: 20px;
}
.mux-input-grid { display: flex; gap: 20px; margin-top: 12px; flex-wrap: wrap; }
.mux-data-input { display: flex; align-items: center; gap: 8px; }
.mux-data-input label { font-weight: 600; color: var(--accent-blue); min-width: 50px; }

.mux-selector-toggles { display: flex; gap: 20px; margin: 12px 0; }
.mux-sel-toggle { display: flex; align-items: center; gap: 8px; }
.mux-sel-toggle label { font-weight: 700; color: var(--accent-purple); }
.mux-selector-val { color: var(--text-secondary); font-family: var(--font-mono); }

.mux-visual {
    display: flex; align-items: center; justify-content: center; gap: 30px;
    background: var(--bg-card); border-radius: var(--radius-lg); padding: 30px;
}
.mux-visual-inputs { display: flex; flex-direction: column; gap: 8px; }
.mux-vi {
    display: flex; align-items: center; gap: 10px; padding: 8px 14px;
    background: var(--bg-panel); border-radius: 4px; border: 2px solid var(--border);
    transition: var(--transition);
}
.mux-vi.selected { border-color: var(--accent-green); background: rgba(34,197,94,0.1); }
.mux-vi-name { font-size: 0.85rem; color: var(--text-secondary); min-width: 50px; }
.mux-vi-val { font-weight: 700; font-family: var(--font-mono); }
.mux-vi.selected .mux-vi-val { color: var(--accent-green); }

.mux-box {
    width: 100px; height: 140px; background: var(--bg-dark); border: 3px solid var(--accent-orange);
    border-radius: var(--radius); display: flex; flex-direction: column;
    align-items: center; justify-content: center;
}
.mux-box-label { font-weight: 700; color: var(--accent-orange); }
.mux-box-sublabel { font-size: 1.2rem; font-weight: 700; color: var(--accent-orange); }

.mux-visual-output {
    display: flex; flex-direction: column; align-items: center; gap: 8px;
}
.mux-output-label { font-size: 0.85rem; color: var(--text-muted); }
.mux-output-val {
    font-size: 2.5rem; font-weight: 700; color: var(--text-muted);
    width: 60px; height: 60px; display: flex; align-items: center; justify-content: center;
    background: var(--bg-panel); border-radius: 50%; border: 3px solid var(--border);
}
.mux-output-val.out-1 { color: var(--accent-green); border-color: var(--accent-green); }
.mux-output-val.out-0 { color: var(--text-muted); }

.mux-truth-table table { width: 100%; border-collapse: collapse; }
.mux-truth-table th, .mux-truth-table td {
    padding: 8px 12px; text-align: center; border: 1px solid var(--border); font-family: var(--font-mono);
}
.mux-truth-table th { background: var(--bg-card); color: var(--text-secondary); }
.mux-truth-table tr.active { background: rgba(245,158,11,0.1); }

/* ============ R-S LATCH ============ */
.rs-latch-section { margin-bottom: 24px; }
.rs-controls {
    display: flex; gap: 24px; margin: 16px 0; align-items: flex-end;
}
.rs-visual {
    display: flex; flex-direction: column; align-items: center; gap: 16px;
    background: var(--bg-card); border-radius: var(--radius-lg); padding: 24px; margin: 16px 0;
}
.rs-output-box {
    display: flex; align-items: center; gap: 12px; padding: 16px 32px;
    border-radius: var(--radius); font-size: 1.2rem; border: 3px solid var(--border);
    background: var(--bg-panel);
}
.rs-output-box.set { border-color: var(--accent-green); }
.rs-output-box.reset { border-color: var(--accent-blue); }
.rs-output-box.hold { border-color: var(--accent-purple); }
.rs-output-box.danger { border-color: var(--accent-red); background: rgba(239,68,68,0.1); }
.rs-output-label { color: var(--text-secondary); }
.rs-output-val { font-size: 2rem; font-weight: 700; font-family: var(--font-mono); color: var(--text-primary); }
.rs-state-msg {
    font-size: 0.95rem; color: var(--text-secondary); text-align: center;
    padding: 12px; background: var(--bg-panel); border-radius: var(--radius); width: 100%;
}

.rs-truth-table { margin: 16px 0; }
.rs-truth-table table { width: 100%; border-collapse: collapse; }
.rs-truth-table th, .rs-truth-table td {
    padding: 10px 14px; text-align: center; border: 1px solid var(--border);
}
.rs-truth-table th { background: var(--bg-card); color: var(--text-secondary); }
.rs-truth-table tr.selected { background: rgba(59,130,246,0.15); }

.section-divider {
    border: none; border-top: 2px solid var(--border); margin: 32px 0;
}

/* Responsive handled in main responsive section */