/* ─── Global ──────────────────────────────────────────────────────────── */
body {
    font-family: 'Source Sans Pro', -apple-system, sans-serif;
    color: #24292f;
    background: #ffffff;
}

.section {
    padding: 2.5rem 0;
}

hr.divider {
    border: 0;
    border-top: 1px solid #e5e7eb;
    margin: 0 auto;
    max-width: 900px;
}

/* ─── Hero / Title ────────────────────────────────────────────────────── */
.hero {
    padding: 3rem 0 1.5rem;
}

.title {
    font-size: 3.2rem;
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 1rem;
}

/* ─── Fourier Title Animation ────────────────────────────────────────── */
#fourier-canvas {
    display: block;
    margin: 0 auto 0.3rem;
    max-width: 100%;
}

.subtitle {
    font-weight: 400;
    font-size: 1.6rem;
    color: #57606a;
}

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

.author {
    margin: 0 0.3rem;
}

.affiliations {
    font-size: 0.95rem;
    color: #6e7781;
    margin-bottom: 0.4rem;
}

.equal-contrib {
    font-size: 0.85rem;
    color: #8b949e;
    margin-bottom: 1.2rem;
    font-style: italic;
}

.link-buttons .btn {
    margin: 0.25rem 0.3rem;
    border-radius: 20px;
    padding: 0.35rem 1rem;
    font-size: 0.9rem;
    font-weight: 600;
}

.link-buttons .btn i {
    margin-right: 0.3rem;
}

/* ─── Section Titles ──────────────────────────────────────────────────── */
.section-title {
    font-size: 1.6rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
}

/* ─── Abstract ────────────────────────────────────────────────────────── */
.abstract-text {
    text-align: justify;
    font-size: 1.05rem;
    line-height: 1.7;
}

.text-justified {
    text-align: justify;
    line-height: 1.65;
}

/* ─── BibTeX ──────────────────────────────────────────────────────────── */
.bibtex {
    background: #f6f8fa;
    border: 1px solid #d0d7de;
    border-radius: 8px;
    padding: 1rem 1.2rem;
    font-size: 0.85rem;
    overflow-x: auto;
}

.bibtex code {
    color: #24292f;
}

/* ─── 4-Way Comparison Slider ────────────────────────────────────────── */
.quad-compare {
    position: relative;
    overflow: hidden;
    cursor: ew-resize;
    border-radius: 8px;
    user-select: none;
    -webkit-user-select: none;
}

.qc-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.qc-layer:first-child {
    position: relative; /* first layer sets the aspect ratio */
}

.qc-layer img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.qc-layer .qc-label {
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0,0,0,0.65);
    color: #fff;
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
    pointer-events: none;
    white-space: nowrap;
    z-index: 5;
}

.qc-handle {
    position: absolute;
    top: 0;
    width: 3px;
    height: 100%;
    background: #ffffff;
    transform: translateX(-50%);
    z-index: 20;
    cursor: ew-resize;
    box-shadow: 0 0 6px rgba(0,0,0,0.4);
}

.qc-handle::before {
    content: '';
    position: absolute;
    top: 0;
    left: -10px;
    width: 23px;
    height: 100%;
}

.qc-handle-knob {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 24px;
    height: 24px;
    background: #ffffff;
    border-radius: 50%;
    box-shadow: 0 1px 4px rgba(0,0,0,0.35);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.55rem;
    color: #555;
    pointer-events: none;
}

/* Scene selector tabs */
.scene-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
    margin-bottom: 1rem;
}

.scene-tabs button {
    border: 1px solid #d0d7de;
    background: #f6f8fa;
    color: #24292f;
    padding: 5px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
}

.scene-tabs button:hover {
    background: #eaeef2;
}

.scene-tabs button.active {
    background: #0969da;
    color: #fff;
    border-color: #0969da;
}

/* ─── Results Tables ─────────────────────────────────────────────────── */
.results-table {
    font-size: 0.82rem;
    border-collapse: collapse;
}

.results-table th,
.results-table td {
    text-align: center;
    padding: 4px 6px;
    white-space: nowrap;
    vertical-align: middle;
}

.results-table th {
    background: #f6f8fa;
    font-weight: 600;
    border-bottom: 2px solid #d0d7de;
}

.results-table td:first-child,
.results-table th:first-child {
    text-align: left;
    font-weight: 600;
}

.results-table .border-left {
    border-left: 2px solid #d0d7de;
}

.results-table .best,
td.best {
    background: #fde2e2;
    font-weight: 700;
}

.results-table .second,
td.second {
    background: #fff3e0;
}

.results-table .ours-row {
    background: #f0f7ff;
}

.best-cell {
    background: #fde2e2;
    padding: 1px 8px;
    border-radius: 3px;
    font-weight: 600;
    font-size: 0.85rem;
}

.second-cell {
    background: #fff3e0;
    padding: 1px 8px;
    border-radius: 3px;
    font-size: 0.85rem;
}

/* ─── 3D Mesh Viewer ─────────────────────────────────────────────────── */
.mesh-viewer {
    width: 100%;
    border-radius: 8px;
    overflow: hidden;
    background: #f6f8fa;
    border: 1px solid #e5e7eb;
    cursor: grab;
}

.mesh-viewer:active {
    cursor: grabbing;
}

.mesh-viewer canvas {
    display: block;
    border-radius: 8px;
}

/* ─── Videos ──────────────────────────────────────────────────────────── */
video {
    border-radius: 8px;
}

/* ─── Responsive ──────────────────────────────────────────────────────── */
@media (max-width: 768px) {
    .title {
        font-size: 2.0rem;
    }
    .subtitle {
        font-size: 1.1rem;
    }
    .section {
        padding: 1.5rem 0;
    }
}