/* ============================================================
   Project Page: Human-level 3D shape perception
   ============================================================ */

:root {
    --serif: 'Source Serif 4', Georgia, serif;
    --sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --mono: 'JetBrains Mono', monospace;

    --bg: #ffffff;
    --bg-alt: #f7f5f2;
    --text: #1a1a1a;
    --text-secondary: #555;
    --accent: #c03030;
    --accent-light: #e8d4d4;
    --border: #e0dcd6;

    --max-width: 1100px;
    --narrow-width: 740px;
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
    font-size: 18px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--sans);
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Layout ---------- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.container.narrow {
    max-width: var(--narrow-width);
}

.section {
    padding: 5rem 0;
}

.alt-bg {
    background: var(--bg-alt);
}

/* ---------- Hero ---------- */
#hero {
    padding: 6rem 0 4rem;
    text-align: center;
    border-bottom: 1px solid var(--border);
}

#hero h1 {
    font-family: var(--serif);
    font-weight: 700;
    font-size: 2.6rem;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 1.2rem;
}

.authors {
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
}

.authors a {
    color: var(--text);
    font-weight: 500;
}

.affiliation {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.hero-links {
    display: flex;
    gap: 0.8rem;
    justify-content: center;
}

.tldr {
    margin-top: 1.2rem;
    font-size: 1.05rem;
    font-style: italic;
    color: var(--text-secondary);
    text-align: center;
    max-width: 36rem;
    margin-left: auto;
    margin-right: auto;
}

.btn {
    display: inline-block;
    padding: 0.5rem 1.4rem;
    border: 1.5px solid var(--text);
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text);
    transition: all 0.15s;
}

.btn:hover {
    background: var(--text);
    color: var(--bg);
    text-decoration: none;
}

.btn-icon {
    width: 1em;
    height: 1em;
    vertical-align: -0.15em;
    margin-right: 0.35em;
}

/* ---------- Section headings ---------- */
h2 {
    font-family: var(--serif);
    font-weight: 600;
    font-size: 1.8rem;
    margin-bottom: 0.8rem;
    letter-spacing: -0.01em;
}

h3 {
    font-family: var(--sans);
    font-weight: 600;
    font-size: 1.05rem;
    margin-bottom: 0.5rem;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 2rem;
}

.section-note {
    margin-top: 2rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-align: center;
}

.lede {
    font-family: var(--serif);
    font-size: 1.4rem;
    font-weight: 400;
    line-height: 1.5;
    margin-bottom: 1.2rem;
    color: var(--text);
}

p + p {
    margin-top: 0.9rem;
}

.caption {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.6rem;
    line-height: 1.5;
}

/* ---------- Oddity demo (Section 2) ---------- */
.condition-tabs {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.condition-tab {
    font-family: var(--sans);
    font-size: 0.85rem;
    font-weight: 500;
    padding: 0.4rem 1rem;
    border: 1.5px solid var(--border);
    border-radius: 20px;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
}

.condition-tab:hover {
    border-color: var(--text);
    color: var(--text);
}

.condition-tab.active {
    background: var(--text);
    color: var(--bg);
    border-color: var(--text);
}

.oddity-grid {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.oddity-card {
    width: 260px;
    cursor: pointer;
    border-radius: 8px;
    overflow: hidden;
    border: 3px solid transparent;
    transition: border-color 0.15s, transform 0.15s;
    background: #fff;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}

.oddity-card:hover {
    transform: translateY(-2px);
    border-color: var(--border);
}

.oddity-card.correct {
    border-color: #2e7d32;
    box-shadow: 0 0 0 2px rgba(46,125,50,0.2);
}

.oddity-card.incorrect {
    border-color: #c62828;
    box-shadow: 0 0 0 2px rgba(198,40,40,0.2);
}

.oddity-card.revealed {
    border-color: #2e7d32;
    opacity: 0.7;
}

.oddity-card img {
    width: 100%;
    height: auto;
    display: block;
}

.feedback {
    text-align: center;
    padding: 1.2rem;
    border-radius: 8px;
    margin: 1rem auto;
    max-width: 500px;
}

.feedback.hidden { display: none; }

.feedback-stats {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 0.3rem;
}

/* ---------- Figures ---------- */
.figure-single {
    text-align: center;
    margin: 2rem auto;
}

.figure-single .figure-img {
    max-width: 370px;
    margin: 0 auto;
}

.figure-single .figure-img-medium {
    max-width: 500px;
}

.figure-single .figure-img-wide {
    max-width: min(600px, 100%);
}

.figure-single .figure-img-full {
    max-width: 100%;
}

.figure-img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
}

.figure-video {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
}

.figure-pair {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin: 2rem auto;
    max-width: 550px;
}

.figure-panel {
    text-align: center;
}

.figure-panel .figure-img {
    margin: 0 auto;
}

.figure-placeholder {
    background: var(--bg-alt);
    border: 2px dashed var(--border);
    border-radius: 8px;
    padding: 3rem 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 240px;
}

.placeholder-text {
    color: var(--text-secondary);
    text-align: center;
    font-size: 0.95rem;
}

/* ---------- Object gallery ---------- */
.object-gallery {
    margin-top: 3rem;
}

.object-gallery h3 {
    text-align: center;
    margin-bottom: 1rem;
}

.gallery-strip {
    display: flex;
    gap: 1rem;
    overflow-x: auto;
    padding: 1rem 0;
    justify-content: center;
    flex-wrap: wrap;
}

.gallery-strip img {
    width: 100px;
    height: 100px;
    object-fit: contain;
    border-radius: 6px;
    background: #fff;
    box-shadow: 0 1px 6px rgba(0,0,0,0.08);
}

/* ---------- Sensory Signals (3-column: video, depth, motion) ---------- */
.sensory-signals {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1rem;
    margin: 2rem auto;
    max-width: 900px;
}

.sensory-col {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.sensory-label {
    font-family: var(--sans);
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.sensory-source {
    font-weight: 400;
    opacity: 0.7;
}

.sensory-media {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: 6px;
    border: 1px solid var(--border);
    display: block;
    background: var(--bg);
}

@media (max-width: 640px) {
    .sensory-signals {
        grid-template-columns: 1fr;
        max-width: 320px;
    }
}

/* ---------- Headcam (legacy) ---------- */
.headcam-container {
    margin: 2rem 0;
    text-align: center;
}

.headcam-container .figure-video {
    max-width: 370px;
    margin: 0 auto;
}

.headcam-container .figure-placeholder {
    max-width: 600px;
    margin: 0 auto;
    min-height: 340px;
}

/* ---------- Two-column layout (Section 5) ---------- */
.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
    margin: 2rem 0;
}

.col-text p {
    font-size: 0.95rem;
}

.col-figure .figure-placeholder {
    min-height: 300px;
}

.col-figure .figure-video {
    max-width: 450px;
    width: 100%;
    border-radius: 6px;
}

.dl3dv-container {
    margin: 2rem 0;
    text-align: center;
}

.dl3dv-container .figure-video {
    max-width: 450px;
    margin: 0 auto;
}

/* ---------- Camera Viz (3D trajectory) ---------- */
.camera-viz-container {
    margin: 2.5rem 0 0;
}

.camera-viz-row-3col {
    display: grid;
    grid-template-columns: 1fr 1fr 1.5fr;
    gap: 0.8rem;
    align-items: start;
    margin: 0 auto;
}

.camera-viz-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.camera-viz-panel-label {
    font-family: var(--sans);
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.camera-viz-panel .figure-video,
.camera-viz-panel img {
    width: 100%;
    height: 280px;
    object-fit: cover;
    border-radius: 6px;
    border: 1px solid var(--border);
    display: block;
}

.camera-viz-panel-wide {
    min-width: 0;
}

.camera-viz-canvas {
    width: 100%;
    height: 280px;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--bg-alt);
    overflow: hidden;
}

.camera-viz-controls {
    text-align: center;
    margin-top: 1rem;
}

@media (max-width: 768px) {
    .camera-viz-row-3col {
        grid-template-columns: 1fr;
    }
    .camera-viz-canvas {
        height: 240px;
    }
}

.model-schematic {
    margin-top: 2.5rem;
    text-align: center;
}

.model-schematic .figure-placeholder {
    max-width: 800px;
    margin: 0 auto;
    min-height: 200px;
}

/* ---------- Results panel highlight (Section 5) ---------- */
.results-panels {
    position: relative;
    display: inline-block;
    width: 100%;
}

.panel-overlay {
    position: absolute;
    top: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0);
    transition: background 0.25s ease;
    pointer-events: auto;
    cursor: default;
}

.panel-overlay[data-panel="left"]   { left: 0;      width: 33.3%; }
.panel-overlay[data-panel="center"] { left: 33.3%;   width: 33.4%; }
.panel-overlay[data-panel="right"]  { left: 66.7%;   width: 33.3%; }

.results-panels.has-highlight .panel-overlay.dimmed {
    background: rgba(247, 245, 242, 0.7);
}

.panel-link {
    transition: color 0.25s ease;
    cursor: default;
    border-radius: 3px;
}

.panel-link.highlight {
    color: var(--accent);
}

/* ---------- Evaluation steps (Section 6) ---------- */
.eval-steps {
    display: flex;
    gap: 1.5rem;
    margin: 2rem 0;
}

.eval-step {
    flex: 1;
    display: flex;
    gap: 0.8rem;
    align-items: flex-start;
}

.step-number {
    flex-shrink: 0;
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    background: var(--text);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 600;
    margin-top: 0.15rem;
}

.step-content h3 {
    font-size: 0.95rem;
    margin-bottom: 0.3rem;
}

.step-content p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.eval-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 2.5rem;
}

.metric-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.2rem;
}

.metric-card h4 {
    font-family: var(--sans);
    font-size: 0.85rem;
    color: var(--accent);
    margin-bottom: 0.3rem;
}

.metric-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ---------- Results triptych (Section 7) ---------- */
.results-triptych {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin: 2rem 0;
}

.result-panel {
    text-align: center;
}

.result-panel h3 {
    font-family: var(--sans);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 0.8rem;
}

.chart-container {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 0.8rem;
}

.chart-container canvas {
    max-width: 100%;
    height: auto;
}

.results-summary {
    max-width: var(--narrow-width);
    margin: 2rem auto 0;
    text-align: center;
    font-family: var(--serif);
    font-size: 1.05rem;
}

/* ---------- Attention visualization (Section 6) ---------- */
.attention-controls {
    display: flex;
    gap: 2rem;
    margin-bottom: 1.5rem;
    align-items: flex-start;
    flex-wrap: wrap;
}

.attention-controls label {
    font-size: 0.9rem;
    font-weight: 500;
}

.attention-controls select {
    font-family: var(--sans);
    font-size: 0.85rem;
    padding: 0.3rem 0.5rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: #fff;
    margin-left: 0.3rem;
}

.layer-slider-container {
    flex: 1;
    min-width: 200px;
    max-width: 400px;
}

.layer-slider-container label {
    display: block;
    margin-bottom: 0.3rem;
}

.layer-slider-container input[type="range"] {
    width: 100%;
    accent-color: var(--accent);
}

.layer-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.72rem;
    color: var(--text-secondary);
    margin-top: 0.15rem;
}

.attn-toggle {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
}

.attn-toggle input[type="checkbox"] {
    accent-color: var(--accent);
    width: 1rem;
    height: 1rem;
}

/* Attention grid layout */
.attn-grid {
    display: flex;
    gap: 1rem;
    margin: 1.5rem 0;
    align-items: flex-start;
    justify-content: center;
}

.attn-col {
    flex-shrink: 0;
    text-align: center;
    align-self: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.attn-col-header {
    font-family: var(--sans);
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
}

/* Source image A: taller, spans both rows visually */
.attn-col #attn-source {
    width: 180px;
    height: 180px;
    border-radius: 6px;
    border: 2px solid var(--border);
}

/* Reference A'/B images */
.attn-col #attn-ref-match,
.attn-col #attn-ref-nonmatch {
    width: 180px;
    height: 180px;
    border-radius: 4px;
    border: 2px solid var(--border);
}

.attn-heatmap-cols {
    display: flex;
    gap: 0.5rem;
}

.attn-point-col {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.attn-point-header {
    font-family: var(--sans);
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
}

.attn-point-col canvas {
    width: 180px;
    height: 180px;
    border-radius: 4px;
    border: 1px solid var(--border);
}

/* ---------- Open Questions ---------- */
.open-questions-list {
    margin-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.oq-item h3 {
    font-family: var(--serif);
    font-weight: 600;
    font-size: 1.05rem;
    margin-bottom: 0.4rem;
}

.oq-item p {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* ---------- Footer ---------- */
footer {
    padding: 4rem 0;
    border-top: 1px solid var(--border);
    background: var(--bg-alt);
}

footer h2 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.citation {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 1rem 1.2rem;
    overflow-x: auto;
    font-size: 0.8rem;
    line-height: 1.5;
    margin-bottom: 1.5rem;
}

.citation code {
    font-family: var(--mono);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.footer-links a {
    font-weight: 500;
}

.acknowledgments {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.references {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.6;
    padding-left: 1.5rem;
}

.references li {
    margin-bottom: 0.4rem;
}

.references li a {
    font-size: 0.75rem;
}

sup a {
    text-decoration: none;
    font-size: 0.65rem;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
    html { font-size: 16px; }
    #hero h1 { font-size: 1.8rem; }
    .figure-pair,
    .two-col,
    .results-triptych,
    .eval-metrics { grid-template-columns: 1fr; }
    .eval-steps { flex-direction: column; }
    .oddity-card { width: 200px; }
    .attention-viz { flex-direction: column; }
    .attn-reference canvas { width: 160px; height: 160px; }

    /* Attention viz: horizontal scroll on mobile */
    .attn-grid {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding-bottom: 0.5rem;
    }

    .figure-single .figure-img,
    .figure-single .figure-img-medium,
    .figure-single .figure-img-wide {
        max-width: 100%;
    }
}