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

:root {
    --clr-bg:        #0c0c14;
    --clr-surface:   #14141f;
    --clr-card:      #1a1a2e;
    --clr-border:    #2a2a40;
    --clr-text:      #e2e2ef;
    --clr-text-dim:  #9999b3;
    --clr-accent:    #6c63ff;
    --clr-accent2:   #ff6584;
    --clr-accent3:   #43e8d8;
    --radius:        12px;
    --shadow:        0 4px 24px rgba(0,0,0,.35);
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--clr-bg);
    color: var(--clr-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

/* ── Animated gradient background ──────────────────────────────── */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 20% 10%, rgba(108,99,255,.12) 0%, transparent 60%),
        radial-gradient(ellipse 60% 50% at 80% 90%, rgba(255,101,132,.08) 0%, transparent 60%),
        radial-gradient(ellipse 50% 40% at 50% 50%, rgba(67,232,216,.06) 0%, transparent 60%);
    z-index: -1;
    pointer-events: none;
}

/* ── Layout ────────────────────────────────────────────────────── */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

section {
    padding: 60px 0;
}

/* ── Hero ──────────────────────────────────────────────────────── */
.hero {
    text-align: center;
    padding: 100px 0 60px;
}

.badge {
    display: inline-block;
    padding: 6px 18px;
    border-radius: 100px;
    font-size: .8rem;
    font-weight: 600;
    letter-spacing: .08em;
    text-transform: uppercase;
    background: linear-gradient(135deg, var(--clr-accent), var(--clr-accent2));
    color: #fff;
    margin-bottom: 24px;
}

h1 {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 8px;
    background: linear-gradient(135deg, #fff 30%, var(--clr-accent3));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: clamp(1.1rem, 2.5vw, 1.4rem);
    color: var(--clr-text-dim);
    margin-bottom: 32px;
    font-weight: 300;
}

/* ── Authors ───────────────────────────────────────────────────── */
.authors {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
    margin-bottom: 8px;
}

.author {
    font-size: 1.1rem;
    font-weight: 500;
}

.author .equal {
    font-size: .75rem;
    vertical-align: super;
    color: var(--clr-accent);
}

.affiliation {
    color: var(--clr-text-dim);
    font-size: .95rem;
    margin-bottom: 6px;
}

.affiliation-logo {
    height: 22px;
    vertical-align: middle;
    margin-right: 4px;
    filter: brightness(0) invert(1) opacity(.7);
}

.equal-note {
    color: var(--clr-text-dim);
    font-size: .85rem;
    margin-top: 4px;
}

/* ── Links row ─────────────────────────────────────────────────── */
.links {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-top: 28px;
}

.links a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 22px;
    border-radius: 100px;
    font-size: .9rem;
    font-weight: 500;
    text-decoration: none;
    transition: transform .2s, box-shadow .2s;
}

.links a:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(108,99,255,.3);
}

.btn-primary {
    background: var(--clr-accent);
    color: #fff;
}

.btn-outline {
    border: 1.5px solid var(--clr-border);
    color: var(--clr-text);
    background: transparent;
}

.btn-outline:hover {
    border-color: var(--clr-accent);
}

/* ── Section titles ────────────────────────────────────────────── */
h2 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 12px;
    position: relative;
    display: inline-block;
}

h2::after {
    content: '';
    display: block;
    width: 48px;
    height: 3px;
    border-radius: 3px;
    background: linear-gradient(90deg, var(--clr-accent), var(--clr-accent2));
    margin-top: 8px;
}

.section-desc {
    color: var(--clr-text-dim);
    max-width: 680px;
    margin-bottom: 40px;
    font-size: .97rem;
}

/* ── Abstract ──────────────────────────────────────────────────── */
.abstract-box {
    background: var(--clr-card);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius);
    padding: 36px 40px;
    box-shadow: var(--shadow);
    line-height: 1.85;
    font-size: .97rem;
    color: var(--clr-text);
}

.abstract-box p {
    margin-bottom: 0;
}

/* ── Citation ──────────────────────────────────────────────────── */
.citation-box {
    position: relative;
    background: var(--clr-card);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius);
    padding: 28px 32px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.citation-box pre {
    font-family: 'JetBrains Mono', monospace;
    font-size: .85rem;
    line-height: 1.7;
    color: var(--clr-text-dim);
    white-space: pre-wrap;
    word-break: break-word;
    margin: 0;
}

.copy-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(108,99,255,.15);
    border: 1px solid var(--clr-accent);
    color: var(--clr-accent);
    padding: 6px 14px;
    border-radius: 100px;
    font-size: .78rem;
    font-weight: 600;
    cursor: pointer;
    transition: background .2s, transform .2s;
}

.copy-btn:hover {
    background: rgba(108,99,255,.3);
    transform: translateY(-1px);
}

/* ── Example row (3-col) ───────────────────────────────────────── */
.example-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.example-row.two-col {
    grid-template-columns: repeat(2, 1fr);
}

.example-card {
    background: var(--clr-card);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: border-color .25s, transform .25s;
}

.example-card:hover {
    border-color: var(--clr-accent);
    transform: translateY(-3px);
}

.example-card video {
    width: 100%;
    display: block;
    background: #000;
}

.card-label {
    padding: 14px 16px;
    font-size: .85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--clr-text-dim);
    text-align: center;
}

.card-label .highlight {
    color: var(--clr-accent3);
}

.card-label .highlight-fwd {
    color: var(--clr-accent);
}

.card-label .highlight-bwd {
    color: var(--clr-accent2);
}

.card-label .highlight-blend {
    background: linear-gradient(90deg, var(--clr-accent), var(--clr-accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ── Divider ───────────────────────────────────────────────────── */
.divider {
    border: none;
    border-top: 1px solid var(--clr-border);
    margin: 0;
}

/* ── Note banner ───────────────────────────────────────────────── */
.note {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    background: rgba(108,99,255,.08);
    border-left: 3px solid var(--clr-accent);
    border-radius: 0 var(--radius) var(--radius) 0;
    padding: 16px 20px;
    margin-bottom: 48px;
    font-size: .9rem;
    color: var(--clr-text-dim);
    line-height: 1.6;
}

.note svg {
    flex-shrink: 0;
    margin-top: 2px;
}

/* ── Example set header ────────────────────────────────────────── */
.example-set-label {
    font-size: .8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: var(--clr-text-dim);
    margin-bottom: 16px;
    opacity: .6;
}

/* ── Footer ────────────────────────────────────────────────────── */
footer {
    text-align: center;
    padding: 40px 0;
    color: var(--clr-text-dim);
    font-size: .85rem;
    border-top: 1px solid var(--clr-border);
}

footer a {
    color: var(--clr-accent);
    text-decoration: none;
}

/* ── Responsive ────────────────────────────────────────────────── */
@media (max-width: 720px) {
    .example-row {
        grid-template-columns: 1fr;
    }
    .example-row.two-col {
        grid-template-columns: 1fr;
    }
    .authors { gap: 16px; }
    .abstract-box { padding: 24px; }
    section { padding: 40px 0; }
    .hero { padding: 60px 0 40px; }
}

/* ── Fade-in animation ─────────────────────────────────────────── */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity .6s ease, transform .6s ease;
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ── Icon helper ───────────────────────────────────────────────── */
.icon {
    width: 18px;
    height: 18px;
    fill: currentColor;
}