/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #06b6d4;
    
    --bg-color: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-color: #f1f5f9;
    --text-muted: #94a3b8;
    --border-color: #475569;
    
    --conventional-color: #22c55e;
    --boot-color: #3b82f6;
    --runtime-color: #a855f7;
    --reserved-color: #ef4444;
    --mmio-color: #f59e0b;
    --smram-color: #ec4899;
    --acpi-color: #14b8a6;
}

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

/* Navigation */
.navbar {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-brand span {
    background: linear-gradient(135deg, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.home-link {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 400;
    transition: color 0.2s ease;
}

.home-link:hover {
    color: var(--text-color);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 0.5rem;
}

.nav-link {
    color: var(--text-muted);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-color);
    background: var(--bg-tertiary);
}

/* Language Switcher */
.lang-switcher {
    display: flex;
    gap: 0.5rem;
    margin-left: 1rem;
}

.lang-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.lang-btn:hover {
    border-color: var(--primary-color);
    color: var(--text-color);
}

.lang-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

/* Sections */
.section {
    margin-bottom: 4rem;
    scroll-margin-top: 80px;
}

.section h1 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 3px solid var(--primary-color);
    background: linear-gradient(135deg, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subsection {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.subsection h2 {
    font-size: 1.5rem;
    color: var(--info-color);
    margin-bottom: 1rem;
}

.subsection h3 {
    font-size: 1.2rem;
    color: var(--text-color);
    margin: 1.5rem 0 1rem;
}

.description {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
}

.description code {
    background: var(--bg-tertiary);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    color: var(--warning-color);
    font-family: 'Consolas', 'Monaco', monospace;
}

/* Code Blocks */
.code-block {
    background: #0d1117;
    border-radius: 12px;
    padding: 1.5rem;
    overflow-x: auto;
    border: 1px solid var(--border-color);
    margin: 1rem 0;
}

.code-block pre {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    color: #e6edf3;
    line-height: 1.6;
    white-space: pre;
}

/* Diagrams */
.diagram-container {
    background: var(--bg-tertiary);
    border-radius: 12px;
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.diagram {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 200px;
}

/* SVG Styles */
svg {
    max-width: 100%;
    height: auto;
}

.node-box {
    fill: var(--bg-secondary);
    stroke: var(--primary-color);
    stroke-width: 2;
}

.node-title {
    fill: var(--text-color);
    font-size: 14px;
    font-weight: 600;
    text-anchor: middle;
}

.node-field {
    fill: var(--text-muted);
    font-size: 12px;
    font-family: 'Consolas', monospace;
}

.divider {
    stroke: var(--border-color);
    stroke-width: 1;
}

.pointer-dot {
    stroke-width: 2;
}

.pointer-dot.forward {
    fill: var(--success-color);
    stroke: var(--success-color);
}

.pointer-dot.back {
    fill: var(--primary-color);
    stroke: var(--primary-color);
}

.arrow {
    fill: none;
    stroke-width: 2;
}

.forward-arrow {
    stroke: var(--success-color);
}

.back-arrow {
    stroke: var(--primary-color);
}

/* Legend */
.legend {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.forward {
    background: var(--success-color);
}

.dot.back {
    background: var(--primary-color);
}

.color-box {
    width: 20px;
    height: 20px;
    border-radius: 4px;
}

.color-box.conv {
    background: var(--conventional-color);
}

.color-box.boot {
    background: var(--boot-color);
}

.color-box.runtime {
    background: var(--runtime-color);
}

/* Memory Map Entry Styles */
.entry-box {
    stroke-width: 2;
}

.entry-box.type-conventional {
    fill: rgba(34, 197, 94, 0.1);
    stroke: var(--conventional-color);
}

.entry-box.type-boot {
    fill: rgba(59, 130, 246, 0.1);
    stroke: var(--boot-color);
}

.entry-box.type-runtime {
    fill: rgba(168, 85, 247, 0.1);
    stroke: var(--runtime-color);
}

.entry-title {
    fill: var(--text-color);
    font-size: 13px;
    font-weight: 600;
    text-anchor: middle;
}

.list-entry-embed {
    fill: var(--bg-tertiary);
    stroke: var(--border-color);
    stroke-width: 1;
    stroke-dasharray: 4;
}

.embed-title {
    fill: var(--text-muted);
    font-size: 11px;
    text-anchor: middle;
}

.field-name {
    fill: var(--text-muted);
    font-size: 11px;
}

.field-value {
    fill: var(--text-color);
    font-size: 11px;
    font-family: 'Consolas', monospace;
}

.field-value.type-conv {
    fill: var(--conventional-color);
}

.field-value.type-boot {
    fill: var(--boot-color);
}

.field-value.type-runtime {
    fill: var(--runtime-color);
}

.head-label {
    fill: var(--warning-color);
    font-size: 12px;
    text-anchor: middle;
    font-weight: 600;
}

.head-arrow {
    stroke: var(--warning-color);
    stroke-width: 2;
}

/* Memory Types Grid */
.memory-types-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.type-card {
    padding: 1rem;
    border-radius: 10px;
    border: 2px solid;
    transition: transform 0.2s ease;
}

.type-card:hover {
    transform: translateY(-3px);
}

.type-card h4 {
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
    font-family: 'Consolas', monospace;
}

.type-card p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.type-card.reserved {
    background: rgba(239, 68, 68, 0.1);
    border-color: var(--reserved-color);
}

.type-card.reserved h4 {
    color: var(--reserved-color);
}

.type-card.loader-code,
.type-card.loader-data {
    background: rgba(249, 115, 22, 0.1);
    border-color: #f97316;
}

.type-card.loader-code h4,
.type-card.loader-data h4 {
    color: #f97316;
}

.type-card.bs-code,
.type-card.bs-data {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--boot-color);
}

.type-card.bs-code h4,
.type-card.bs-data h4 {
    color: var(--boot-color);
}

.type-card.rt-code,
.type-card.rt-data {
    background: rgba(168, 85, 247, 0.1);
    border-color: var(--runtime-color);
}

.type-card.rt-code h4,
.type-card.rt-data h4 {
    color: var(--runtime-color);
}

.type-card.conventional {
    background: rgba(34, 197, 94, 0.1);
    border-color: var(--conventional-color);
}

.type-card.conventional h4 {
    color: var(--conventional-color);
}

.type-card.acpi-reclaim,
.type-card.acpi-nvs {
    background: rgba(20, 184, 166, 0.1);
    border-color: var(--acpi-color);
}

.type-card.acpi-reclaim h4,
.type-card.acpi-nvs h4 {
    color: var(--acpi-color);
}

.type-card.mmio {
    background: rgba(245, 158, 11, 0.1);
    border-color: var(--mmio-color);
}

.type-card.mmio h4 {
    color: var(--mmio-color);
}

.type-card.persistent {
    background: rgba(236, 72, 153, 0.1);
    border-color: var(--smram-color);
}

.type-card.persistent h4 {
    color: var(--smram-color);
}

/* Memory Layout Section */
.memory-layout {
    display: flex;
    gap: 1rem;
    padding: 1rem;
}

.address-column {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 0.5rem 0;
    min-width: 100px;
}

.address {
    font-family: 'Consolas', monospace;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: right;
}

.memory-blocks {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.mem-block {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 0.75rem;
    border: 2px solid;
    text-align: center;
    transition: transform 0.2s ease;
}

.mem-block:hover {
    transform: scale(1.02);
    z-index: 10;
}

.block-name {
    font-weight: 600;
    font-size: 0.95rem;
}

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

.block-size {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-style: italic;
}

.mmio-block {
    background: rgba(245, 158, 11, 0.15);
    border-color: var(--mmio-color);
    flex: 0.8;
}

.mmio-block .block-name {
    color: var(--mmio-color);
}

.smram-block {
    background: rgba(236, 72, 153, 0.15);
    border-color: var(--smram-color);
    flex: 0.6;
}

.smram-block .block-name {
    color: var(--smram-color);
}

.pci-block {
    background: rgba(249, 115, 22, 0.15);
    border-color: #f97316;
    flex: 1;
}

.pci-block .block-name {
    color: #f97316;
}

.dxe-block {
    background: rgba(34, 197, 94, 0.15);
    border-color: var(--conventional-color);
    flex: 2.5;
}

.dxe-block .block-name {
    color: var(--conventional-color);
}

.runtime-block {
    background: rgba(168, 85, 247, 0.15);
    border-color: var(--runtime-color);
    flex: 0.5;
}

.runtime-block .block-name {
    color: var(--runtime-color);
}

.boot-block {
    background: rgba(59, 130, 246, 0.15);
    border-color: var(--boot-color);
    flex: 0.8;
}

.boot-block .block-name {
    color: var(--boot-color);
}

.legacy-block {
    background: rgba(100, 116, 139, 0.15);
    border-color: var(--secondary-color);
    flex: 0.4;
}

.legacy-block .block-name {
    color: var(--secondary-color);
}

.low-block {
    background: rgba(239, 68, 68, 0.15);
    border-color: var(--reserved-color);
    flex: 0.3;
}

.low-block .block-name {
    color: var(--reserved-color);
}

.info-column {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-width: 80px;
}

.info-item {
    display: flex;
    align-items: center;
}

.info-label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Initial Map Diagram */
.initial-map {
    overflow-x: auto;
}

.initial-map-svg {
    min-width: 900px;
}

.head-box {
    fill: var(--bg-secondary);
    stroke: var(--warning-color);
    stroke-width: 2;
}

.head-title {
    fill: var(--warning-color);
    font-size: 12px;
    font-weight: 600;
    text-anchor: middle;
}

.head-subtitle {
    fill: var(--text-muted);
    font-size: 10px;
    text-anchor: middle;
}

.reserved-entry {
    fill: rgba(239, 68, 68, 0.15);
    stroke: var(--reserved-color);
}

.mmio-entry {
    fill: rgba(245, 158, 11, 0.15);
    stroke: var(--mmio-color);
}

.conventional-entry {
    fill: rgba(34, 197, 94, 0.15);
    stroke: var(--conventional-color);
}

.runtime-entry {
    fill: rgba(168, 85, 247, 0.15);
    stroke: var(--runtime-color);
}

.smram-entry {
    fill: rgba(236, 72, 153, 0.15);
    stroke: var(--smram-color);
}

.entry-type {
    font-size: 11px;
    font-weight: 600;
    text-anchor: middle;
}

.reserved-entry + .entry-type,
g:has(.reserved-entry) .entry-type {
    fill: var(--reserved-color);
}

.entry-field {
    font-size: 10px;
    fill: var(--text-muted);
    font-family: 'Consolas', monospace;
}

.connect-line {
    stroke: var(--border-color);
    stroke-width: 1;
    stroke-dasharray: 4;
}

/* Step Controls */
.step-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin: 1.5rem 0;
    flex-wrap: wrap;
}

.step-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.step-btn:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.step-btn:disabled {
    background: var(--bg-tertiary);
    color: var(--text-muted);
    cursor: not-allowed;
}

.reset-btn {
    background: var(--secondary-color);
}

.reset-btn:hover {
    background: #475569;
}

.step-indicator {
    font-size: 1rem;
    color: var(--text-muted);
    min-width: 100px;
    text-align: center;
}

/* Allocation Container */
.allocation-container {
    background: var(--bg-tertiary);
    border-radius: 12px;
    padding: 1.5rem;
}

.step-description {
    background: var(--bg-secondary);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border-left: 4px solid var(--primary-color);
}

.step-description h3 {
    color: var(--primary-color);
    margin-bottom: 0.75rem;
}

.step-description p {
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.step-description strong {
    color: var(--warning-color);
}

.alloc-diagram {
    background: var(--bg-secondary);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1.5rem;
    min-height: 400px;
    overflow-x: auto;
}

/* Algorithm Box */
.algorithm-box {
    background: var(--bg-tertiary);
    border-radius: 12px;
    padding: 1.5rem;
    border: 2px solid var(--info-color);
}

.algorithm-box h4 {
    color: var(--info-color);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.algorithm-box ol {
    padding-left: 1.5rem;
    color: var(--text-muted);
}

.algorithm-box li {
    margin-bottom: 0.75rem;
}

.algorithm-box ul {
    padding-left: 1.5rem;
    margin-top: 0.5rem;
}

/* Merge Diagram */
.merge-diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    padding: 2rem;
    flex-wrap: wrap;
}

.merge-before,
.merge-after {
    text-align: center;
}

.merge-before h4,
.merge-after h4 {
    margin-bottom: 1rem;
    color: var(--text-muted);
}

.merge-blocks {
    display: flex;
    gap: 0;
}

.merge-block {
    padding: 1.5rem 1rem;
    border: 2px solid;
    text-align: center;
    font-size: 0.9rem;
    min-width: 100px;
}

.merge-block.free {
    background: rgba(34, 197, 94, 0.15);
    border-color: var(--conventional-color);
    color: var(--conventional-color);
}

.merge-block.releasing {
    background: rgba(59, 130, 246, 0.15);
    border-color: var(--boot-color);
    color: var(--boot-color);
    animation: pulse 1s infinite;
}

.merge-block.large {
    min-width: 320px;
}

.merge-arrow {
    font-size: 3rem;
    color: var(--primary-color);
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

/* Animation Classes */
.highlight {
    animation: highlight-pulse 1s ease-in-out;
}

@keyframes highlight-pulse {
    0%, 100% {
        filter: brightness(1);
    }
    50% {
        filter: brightness(1.5);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

/* Footer */
.footer {
    background: var(--bg-secondary);
    padding: 2rem;
    text-align: center;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
}

/* Responsive */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .section h1 {
        font-size: 1.8rem;
    }
    
    .memory-layout {
        flex-direction: column;
    }
    
    .address-column {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: space-between;
    }
    
    .memory-blocks {
        min-height: 500px;
    }
    
    .info-column {
        display: none;
    }
}

/* SVG Animation Styles */
.svg-node {
    transition: all 0.3s ease;
}

.svg-node:hover {
    filter: brightness(1.2);
}

.svg-arrow {
    stroke-dasharray: 10;
    animation: dash 0.5s linear forwards;
}

@keyframes dash {
    from {
        stroke-dashoffset: 100;
    }
    to {
        stroke-dashoffset: 0;
    }
}

.searching {
    animation: searchPulse 0.5s ease-in-out;
}

@keyframes searchPulse {
    0%, 100% {
        stroke-width: 2;
        filter: brightness(1);
    }
    50% {
        stroke-width: 4;
        filter: brightness(1.5);
    }
}

.found {
    animation: foundGlow 0.8s ease-in-out;
}

@keyframes foundGlow {
    0% {
        filter: drop-shadow(0 0 5px var(--success-color));
    }
    50% {
        filter: drop-shadow(0 0 20px var(--success-color));
    }
    100% {
        filter: drop-shadow(0 0 5px var(--success-color));
    }
}

.splitting {
    animation: split 0.5s ease-in-out;
}

@keyframes split {
    0% {
        transform: scaleX(1);
    }
    50% {
        transform: scaleX(1.1);
    }
    100% {
        transform: scaleX(1);
    }
}

/* ============================================
   Section 5: Pool Allocation
   ============================================ */

/* ============================================
   Section 6: Boot Timeline
   ============================================ */
.timeline-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.timeline-phase {
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 0.75rem 1.2rem;
    cursor: pointer;
    text-align: center;
    transition: all 0.3s ease;
    min-width: 100px;
}

.timeline-phase:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.timeline-phase.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: 0 0 15px rgba(37, 99, 235, 0.4);
}

.timeline-phase .phase-name {
    display: block;
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-color);
}

.timeline-phase .phase-desc {
    display: block;
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 0.2rem;
}

.timeline-phase.active .phase-desc {
    color: rgba(255, 255, 255, 0.8);
}

.timeline-connector {
    width: 30px;
    height: 3px;
    background: var(--border-color);
    flex-shrink: 0;
}

.timeline-map-container {
    min-height: 250px;
    overflow-x: auto;
}

/* ============================================
   Section 7: Policy Comparator
   ============================================ */
.policy-selector {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin: 1.5rem 0;
    flex-wrap: wrap;
}

.policy-btn {
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    color: var(--text-color);
    padding: 0.6rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all 0.2s ease;
}

.policy-btn:hover {
    border-color: var(--primary-color);
}

.policy-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.policy-request {
    color: var(--warning-color);
    font-weight: 600;
    font-size: 0.95rem;
    margin-left: 1rem;
}

.policy-result {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    color: var(--text-muted);
    font-size: 0.9rem;
    min-height: 40px;
}

/* ============================================
   Section 8: Fragmentation Heatmap
   ============================================ */
.frag-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin: 1.5rem 0;
}

.frag-heatmap {
    background: var(--bg-secondary);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1.5rem;
    overflow-x: auto;
}

.frag-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.metric-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 1rem;
    text-align: center;
}

.metric-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.metric-value {
    display: block;
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--info-color);
    font-family: 'Consolas', monospace;
}

/* ============================================
   Section 9: Runtime Handoff
   ============================================ */
.handoff-container {
    display: flex;
    align-items: stretch;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.handoff-panel {
    flex: 1;
    min-width: 300px;
    background: var(--bg-tertiary);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
}

.handoff-panel h3 {
    color: var(--info-color);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.handoff-arrow {
    display: flex;
    align-items: center;
    font-size: 3rem;
    color: var(--primary-color);
    font-weight: 700;
}

/* ============================================
   Export Toolbar
   ============================================ */
.export-toolbar {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 999;
}

.export-toggle-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.4);
    transition: all 0.2s ease;
}

.export-toggle-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.5);
}

.export-dropdown {
    position: absolute;
    bottom: 100%;
    right: 0;
    margin-bottom: 0.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    min-width: 160px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.export-dropdown.hidden {
    display: none;
}

.export-option {
    display: block;
    width: 100%;
    background: none;
    border: none;
    color: var(--text-color);
    padding: 0.75rem 1.2rem;
    text-align: left;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background 0.15s ease;
}

.export-option:hover {
    background: var(--bg-tertiary);
}

/* ============================================
   Code-to-Visual Linking
   ============================================ */
.code-highlight-link {
    cursor: pointer;
    border-radius: 3px;
    transition: background 0.2s ease;
}

.code-highlight-link:hover {
    background: rgba(37, 99, 235, 0.3);
}

.svg-linked-highlight {
    filter: drop-shadow(0 0 20px var(--primary-color)) brightness(1.4) !important;
    transition: filter 0.3s ease;
}

/* ============================================
   Responsive additions
   ============================================ */
@media (max-width: 768px) {
    .timeline-bar {
        gap: 0.5rem;
    }
    
    .timeline-connector {
        width: 15px;
    }

    .timeline-phase {
        min-width: 70px;
        padding: 0.5rem 0.6rem;
    }
    
    .handoff-container {
        flex-direction: column;
    }
    
    .handoff-arrow {
        justify-content: center;
        transform: rotate(90deg);
    }
    
    .frag-metrics {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .policy-selector {
        flex-direction: column;
    }

    .nav-links {
        gap: 0.25rem;
    }

    .nav-link {
        padding: 0.3rem 0.6rem;
        font-size: 0.8rem;
    }
}