/* ── Semantic colours ── */
.clr-propose {
    color: #D97706;
}

.clr-match {
    color: #2563EB;
}

/* ── Base ── */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Inter", "Helvetica Neue", Arial, sans-serif;
    color: #111;
    background: #fff;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

section {
    padding: 72px 24px;
}

.container {
    max-width: 960px;
    margin: 0 auto;
}

h2 {
    font-size: 1.6rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 32px;
    letter-spacing: -0.02em;
}

/* ── Hero ── */
.hero {
    padding: 120px 24px 80px;
    text-align: center;
    background: #fff;
    border-bottom: 1px solid #e5e5e5;
}

.hero h1 {
    font-size: 2.4rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.25;
    max-width: 860px;
    margin: 0 auto 16px;
}

.hero .authors {
    font-size: 1.05rem;
    color: #555;
    margin-bottom: 28px;
}

.hero .authors sup {
    font-size: 0.7em;
    margin: 0 1px;
}

.hero .affiliations {
    font-size: 0.9rem;
    color: #888;
    line-height: 1.9;
    max-width: 720px;
    margin: 0 auto 32px;
}

.buttons {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 22px;
    border: 1.5px solid #111;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    transition: background 0.2s, color 0.2s;
}

.btn:hover {
    background: #111;
    color: #fff;
}

.btn svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

/* ── TL;DR ── */
.tldr-section {
    background: #fafafa;
    border-bottom: 1px solid #e5e5e5;
}

.tldr-list {
    list-style: none;
    max-width: 740px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.tldr-list li {
    font-size: 0.98rem;
    color: #333;
    line-height: 1.7;
    padding-left: 20px;
    position: relative;
}

.tldr-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 10px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #bbb;
}

.tldr-label {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: #999;
    background: #f0f0f0;
    border-radius: 3px;
    padding: 1px 7px;
    margin-right: 6px;
    vertical-align: middle;
}

/* ── Video Demo ── */
.video-section {
    background: #fff;
    text-align: center;
    border-bottom: 1px solid #e5e5e5;
}

.video-section video {
    max-width: 960px;
    width: 100%;
    border-radius: 6px;
    border: 1px solid #e0e0e0;
}

/* ── Abstract ── */
.abstract-section {
    background: #fff;
    border-bottom: 1px solid #e5e5e5;
}

.abstract-section .container p {
    font-size: 1.02rem;
    color: #333;
    text-align: justify;
    line-height: 1.85;
}

/* ── Method ── */
.method-section {
    background: #fafafa;
    border-bottom: 1px solid #e5e5e5;
}

.method-cards {
    display: flex;
    flex-direction: column;
    gap: 48px;
    max-width: 960px;
    margin: 0 auto;
}

.method-card {
    text-align: center;
}

.method-card img {
    width: 100%;
    max-width: 900px;
    border-radius: 4px;
    border: 1px solid #e0e0e0;
    margin-bottom: 16px;
}

.method-card .caption {
    font-size: 0.92rem;
    color: #555;
    line-height: 1.7;
    max-width: 780px;
    margin: 0 auto;
    text-align: left;
}

/* ── Experiments ── */
.experiment-section {
    background: #fff;
    border-bottom: 1px solid #e5e5e5;
}

.experiment-section .container {
    max-width: 960px;
}

.experiment-block {
    margin-bottom: 56px;
}

.experiment-block:last-child {
    margin-bottom: 0;
}

.experiment-block h3 {
    font-size: 1.15rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.experiment-block p {
    font-size: 0.95rem;
    color: #555;
    line-height: 1.7;
    text-align: center;
    max-width: 720px;
    margin: 0 auto 24px;
}

.experiment-charts {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 36px;
}

.experiment-charts img {
    width: 100%;
    max-width: 800px;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
}

.experiment-charts-row {
    display: flex;
    justify-content: center;
    gap: 24px;
}

.experiment-charts-row img {
    width: 48%;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
}

/* ── Citation ── */
.citation-section {
    background: #fafafa;
    border-bottom: 1px solid #e5e5e5;
}

.citation-block {
    max-width: 680px;
    margin: 0 auto;
    background: #fff;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    padding: 20px 24px;
    font-family: "SFMono-Regular", "Consolas", "Liberation Mono", monospace;
    font-size: 0.82rem;
    line-height: 1.65;
    color: #444;
    text-align: left;
    white-space: pre-wrap;
    word-break: break-word;
    position: relative;
}

.citation-block .copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: #f5f5f5;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 4px 10px;
    font-size: 0.75rem;
    cursor: pointer;
    color: #666;
    transition: background 0.2s;
}

.citation-block .copy-btn:hover {
    background: #e5e5e5;
}

/* ── Footer ── */
footer {
    padding: 32px 24px;
    text-align: center;
    font-size: 0.85rem;
    color: #aaa;
    background: #fff;
}

/* ── Responsive ── */
@media (max-width: 640px) {
    .hero h1 {
        font-size: 1.6rem;
    }

    .hero .authors {
        font-size: 0.92rem;
    }

    section {
        padding: 48px 16px;
    }

    .experiment-charts-row {
        flex-direction: column;
        align-items: center;
    }

    .experiment-charts-row img {
        width: 100%;
    }
}