/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    background: #f8fafc;
    color: #1e293b;
    line-height: 1.8;
    overflow-x: hidden;
}

/* ===== Subtle Background Pattern ===== */
.bg-pattern {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    pointer-events: none; z-index: 0;
    background-image:
        radial-gradient(circle at 20% 15%, rgba(59,130,246,0.04) 0%, transparent 50%),
        radial-gradient(circle at 80% 85%, rgba(99,102,241,0.04) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(139,92,246,0.03) 0%, transparent 60%);
}
.bg-grid {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    pointer-events: none; z-index: 0; opacity: 0.3;
    background-image:
        linear-gradient(rgba(148,163,184,0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148,163,184,0.1) 1px, transparent 1px);
    background-size: 60px 60px;
}

/* ===== Navigation ===== */
nav {
    position: fixed; top: 0; width: 100%;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(100,116,139,0.12);
    z-index: 1000;
    padding: 0 2rem;
}
.nav-inner {
    max-width: 1200px; margin: 0 auto;
    display: flex; flex-direction: column; align-items: center;
    padding: 0.55rem 0 0.3rem;
}
.nav-top {
    width: 100%; position: relative;
    display: flex; align-items: center; justify-content: center;
    padding: 0.1rem 0 0.25rem;
}
.nav-logo {
    font-size: 1.25rem; font-weight: 700;
    background: linear-gradient(135deg, #2563eb, #7c3aed);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.5px;
    text-align: center;
}
.nav-links { display: flex; list-style: none; gap: 2rem; flex-wrap: wrap; justify-content: center; }
.nav-links a {
    color: #475569; text-decoration: none; font-size: 0.95rem;
    transition: color 0.3s; font-weight: 500;
}
.nav-links a:hover { color: #2563eb; }

/* anchor offset for the taller fixed nav */
[id] { scroll-margin-top: 130px; }

/* ===== Nav right / Language toggle ===== */
.nav-right {
    position: absolute; right: 0; top: 50%; transform: translateY(-50%);
    display: flex; align-items: center; gap: 1.1rem;
}
#lang-toggle {
    background: transparent;
    border: 1.5px solid rgba(37,99,235,0.35);
    color: #2563eb;
    border-radius: 50px;
    padding: 0.28rem 0.95rem;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    font-family: inherit;
}
#lang-toggle:hover { background: rgba(37,99,235,0.08); border-color: #2563eb; }

/* ===== Nav dropdown ===== */
.nav-links .dropdown { position: relative; }
.nav-links .dropdown-toggle::after { content: ' \25BE'; font-size: 0.7em; }
.nav-links .dropdown-menu {
    position: absolute; top: 100%; left: 50%;
    transform: translateX(-50%) translateY(6px);
    background: #ffffff;
    border: 1px solid rgba(100,116,139,0.12);
    border-radius: 12px;
    box-shadow: 0 12px 40px rgba(0,0,0,0.12);
    list-style: none;
    padding: 0.5rem;
    min-width: 200px;
    opacity: 0; visibility: hidden;
    transition: opacity 0.25s, transform 0.25s, visibility 0.25s;
    z-index: 1100;
}
.nav-links .dropdown:hover .dropdown-menu,
.nav-links .dropdown:focus-within .dropdown-menu {
    opacity: 1; visibility: visible;
    transform: translateX(-50%) translateY(0);
}
.nav-links .dropdown-menu li { width: 100%; }
.nav-links .dropdown-menu a {
    display: block; padding: 0.45rem 0.9rem;
    border-radius: 8px; font-size: 0.88rem; white-space: nowrap;
}
.nav-links .dropdown-menu a:hover { background: rgba(37,99,235,0.06); }

/* ===== Sections ===== */
section { position: relative; z-index: 1; }

/* ===== Hero ===== */
.hero {
    min-height: 100vh;
    display: flex; align-items: center; justify-content: center;
    text-align: center; padding: 6rem 2rem 4rem;
    background: linear-gradient(180deg, #ffffff 0%, #f1f5f9 100%);
}
.hero-content { max-width: 900px; position: relative; }
.hero-content::before {
    content: '';
    position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(59,130,246,0.06) 0%, transparent 70%);
    border-radius: 50%;
    z-index: -1;
}
.hero-badge {
    display: inline-block;
    background: rgba(37,99,235,0.08);
    border: 1px solid rgba(37,99,235,0.2);
    border-radius: 50px;
    padding: 0.35rem 1.5rem;
    font-size: 0.85rem;
    color: #2563eb;
    margin-bottom: 2rem;
    letter-spacing: 1px;
}
.hero h1 {
    font-size: 3.2rem; font-weight: 800;
    background: linear-gradient(135deg, #1e293b 0%, #2563eb 50%, #7c3aed 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
    line-height: 1.3;
}
.hero .subtitle {
    font-size: 1.15rem; color: #64748b;
    max-width: 650px; margin: 0 auto 2.5rem;
}
.hero-buttons { display: flex; gap: 1.2rem; justify-content: center; flex-wrap: wrap; }
.btn {
    padding: 0.75rem 2rem; border-radius: 50px; font-size: 1rem;
    font-weight: 600; text-decoration: none; cursor: pointer;
    transition: all 0.3s; display: inline-block;
}
.btn-primary {
    background: linear-gradient(135deg, #2563eb, #7c3aed);
    color: white; border: none;
    box-shadow: 0 4px 20px rgba(59,130,246,0.25);
}
.btn-primary:hover {
    box-shadow: 0 6px 30px rgba(59,130,246,0.4);
    transform: translateY(-2px);
}
.btn-outline {
    background: transparent; color: #475569;
    border: 1.5px solid rgba(100,116,139,0.3);
}
.btn-outline:hover {
    background: rgba(37,99,235,0.06);
    border-color: #2563eb;
    color: #2563eb;
}

/* ===== Section Common ===== */
.section-container {
    max-width: 1200px; margin: 0 auto; padding: 5rem 2rem;
}
.section-label {
    font-size: 0.8rem; text-transform: uppercase; letter-spacing: 3px;
    color: #2563eb; margin-bottom: 0.75rem; font-weight: 600;
}
.section-title {
    font-size: 2.4rem; font-weight: 700; color: #0f172a;
    margin-bottom: 1rem; line-height: 1.25;
}
.section-desc {
    color: #64748b; font-size: 1.1rem; max-width: 1000px;
    margin-bottom: 3rem;
}

/* ===== Subpage header ===== */
.page-header {
    padding: 8rem 2rem 3.5rem;
    background: linear-gradient(180deg, #ffffff 0%, #f1f5f9 100%);
    text-align: center;
    position: relative;
}
.breadcrumb { font-size: 0.85rem; color: #94a3b8; margin-bottom: 1.4rem; }
.breadcrumb a { color: #64748b; text-decoration: none; transition: color 0.3s; }
.breadcrumb a:hover { color: #2563eb; }
.breadcrumb .sep { margin: 0 0.5rem; color: #cbd5e1; }
.page-title {
    font-size: 2.3rem; font-weight: 800;
    background: linear-gradient(135deg, #1e293b 0%, #2563eb 50%, #7c3aed 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.8rem; line-height: 1.3;
}
.page-subtitle { font-size: 1.08rem; color: #64748b; max-width: 720px; margin: 0 auto; }

/* ===== Feature Cards ===== */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.8rem;
}
.feature-card {
    background: #ffffff;
    border: 1px solid rgba(100,116,139,0.12);
    border-radius: 16px;
    padding: 2.2rem 1.8rem;
    transition: all 0.35s;
    position: relative;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.feature-card::before {
    content: ''; position: absolute; top: 0; left: 0;
    width: 100%; height: 3px;
    background: linear-gradient(90deg, #2563eb, #7c3aed);
    opacity: 0; transition: opacity 0.35s;
}
.feature-card:hover::before { opacity: 1; }
.feature-card:hover {
    border-color: rgba(37,99,235,0.2);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.08);
}
.feature-icon {
    width: 56px; height: 56px;
    border-radius: 14px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.6rem; margin-bottom: 1.4rem;
}
.icon-blue { background: rgba(37,99,235,0.08); color: #2563eb; }
.icon-purple { background: rgba(124,58,237,0.08); color: #7c3aed; }
.icon-teal { background: rgba(20,184,166,0.08); color: #0d9488; }
.icon-orange { background: rgba(249,115,22,0.08); color: #ea580c; }
.icon-green { background: rgba(34,197,94,0.08); color: #16a34a; }
.icon-pink { background: rgba(236,72,153,0.08); color: #db2777; }
.icon-amber { background: rgba(245,158,11,0.08); color: #d97706; }

/* ===== Team Cards ===== */
.team-card .team-emblem-wrapper {
    display: flex;
    align-items: center;
    gap: 0.9rem;
    margin-bottom: 1.4rem;
}
.team-emblem {
    width: 52px;
    height: 52px;
    flex-shrink: 0;
    object-fit: contain;
    border-radius: 8px;
    background: rgba(255,255,255,0.6);
    padding: 4px;
}

.feature-card h3 {
    font-size: 1.2rem; color: #1e293b; margin-bottom: 0.6rem;
}
.feature-card p { color: #64748b; font-size: 0.95rem; }

/* ===== Illustration Box ===== */
.illustration-box {
    display: flex; gap: 3rem; align-items: center;
    flex-wrap: wrap; margin: 3rem 0;
}
.illustration-svg {
    flex: 1; min-width: 280px;
    display: flex; align-items: center; justify-content: center;
}
.illustration-svg svg { width: 100%; max-width: 420px; }
.illustration-text { flex: 1; min-width: 280px; }
.illustration-text h3 { font-size: 1.6rem; color: #0f172a; margin-bottom: 1rem; }
.illustration-text p { color: #64748b; margin-bottom: 0.8rem; }

/* ===== Timeline (History) ===== */
.timeline {
    position: relative; padding: 2rem 0;
}
.timeline::before {
    content: '';
    position: absolute; left: 50%; top: 0; bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, transparent, rgba(37,99,235,0.3), rgba(37,99,235,0.3), transparent);
    transform: translateX(-50%);
}
.timeline-item {
    display: flex; align-items: flex-start;
    margin-bottom: 3rem; position: relative;
}
.timeline-item:nth-child(odd) { flex-direction: row-reverse; }
.timeline-dot {
    position: absolute; left: 50%; top: 0;
    width: 16px; height: 16px;
    border-radius: 50%;
    background: #2563eb;
    border: 3px solid rgba(37,99,235,0.2);
    transform: translateX(-50%);
    box-shadow: 0 0 16px rgba(37,99,235,0.2);
    z-index: 2;
}
.timeline-content {
    width: 44%; padding: 1.5rem 2rem;
    background: #ffffff;
    border: 1px solid rgba(100,116,139,0.12);
    border-radius: 14px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.timeline-year {
    font-size: 0.8rem; color: #2563eb; font-weight: 700;
    letter-spacing: 2px; margin-bottom: 0.4rem;
}
.timeline-content h4 { font-size: 1.15rem; color: #1e293b; margin-bottom: 0.5rem; }
.timeline-content p { color: #64748b; font-size: 0.93rem; }

@media (max-width: 768px) {
    .timeline::before { left: 20px; }
    .timeline-item, .timeline-item:nth-child(odd) {
        flex-direction: column;
    }
    .timeline-dot { left: 20px; }
    .timeline-content { width: calc(100% - 50px); margin-left: 50px; }
}

/* ===== Use Cases ===== */
.usecase-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}
.usecase-card {
    background: #ffffff;
    border: 1px solid rgba(100,116,139,0.1);
    border-radius: 14px;
    padding: 2rem 1.6rem;
    text-align: center;
    transition: all 0.3s;
    box-shadow: 0 1px 3px rgba(0,0,0,0.03);
}
.usecase-card:hover {
    border-color: rgba(37,99,235,0.25);
    box-shadow: 0 8px 30px rgba(0,0,0,0.07);
}
.usecase-card .uc-icon {
    font-size: 2.6rem; margin-bottom: 1rem;
}
.usecase-card h4 { color: #1e293b; font-size: 1.1rem; margin-bottom: 0.6rem; }
.usecase-card p { color: #64748b; font-size: 0.9rem; }

/* ===== Future Plan Cards ===== */
.future-card {
    background: linear-gradient(135deg, rgba(37,99,235,0.03), rgba(124,58,237,0.03));
    border: 1.5px dashed rgba(37,99,235,0.2);
    border-radius: 14px;
    padding: 2rem 1.6rem;
    text-align: center;
    transition: all 0.3s;
}
.future-card:hover {
    border-color: rgba(37,99,235,0.4);
    background: linear-gradient(135deg, rgba(37,99,235,0.06), rgba(124,58,237,0.06));
}
.future-card .future-badge {
    display: inline-block;
    background: linear-gradient(135deg, #2563eb, #7c3aed);
    color: white;
    border-radius: 50px;
    padding: 0.2rem 0.9rem;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 1rem;
}
.future-card .uc-icon {
    font-size: 2.4rem; margin-bottom: 0.8rem;
    opacity: 0.7;
}
.future-card h4 { color: #334155; font-size: 1.1rem; margin-bottom: 0.5rem; }
.future-card p { color: #94a3b8; font-size: 0.9rem; }

/* ===== Diagram Section ===== */
.diagram-container {
    display: flex; gap: 2rem; flex-wrap: wrap;
    align-items: center; justify-content: center;
    margin: 2.5rem 0;
}

/* ===== Stats Bar ===== */
.stats-bar {
    display: flex; justify-content: center; gap: 3rem;
    flex-wrap: wrap; padding: 3rem 2rem;
    background: #ffffff;
    border-top: 1px solid rgba(100,116,139,0.1);
    border-bottom: 1px solid rgba(100,116,139,0.1);
}
.stat-item { text-align: center; }
.stat-number {
    font-size: 2.4rem; font-weight: 800;
    background: linear-gradient(135deg, #2563eb, #7c3aed);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-label { color: #64748b; font-size: 0.9rem; margin-top: 0.3rem; }

/* ===== CTA Section ===== */
.cta-section {
    text-align: center; padding: 6rem 2rem;
    background: linear-gradient(180deg, #f1f5f9, #ffffff);
}
.cta-section h2 {
    font-size: 2.2rem; color: #0f172a; margin-bottom: 1rem;
}
.cta-section p { color: #64748b; max-width: 600px; margin: 0 auto 2rem; }

/* ===== References Section ===== */
.references-section {
    background: #ffffff;
    border-top: 1px solid rgba(100,116,139,0.1);
    padding: 4rem 2rem;
}
.references-list {
    list-style: none; max-width: 900px; margin: 0 auto;
}
.references-list li {
    padding: 0.7rem 0;
    border-bottom: 1px solid rgba(100,116,139,0.06);
    color: #475569;
    font-size: 0.92rem;
    line-height: 1.6;
}
.references-list li:last-child { border-bottom: none; }
.references-list li code { background: #f1f5f9; padding: 0.1rem 0.4rem; border-radius: 4px; font-size: 0.85rem; }

/* ===== Footer ===== */
footer {
    background: #f8fafc;
    border-top: 1px solid rgba(100,116,139,0.1);
    padding: 3rem 2rem 2rem;
    text-align: center;
    color: #94a3b8; font-size: 0.9rem;
}
.footer-links { display: flex; gap: 2rem; justify-content: center; flex-wrap: wrap; margin-bottom: 1.5rem; }
.footer-links a { color: #64748b; text-decoration: none; transition: color 0.3s; }
.footer-links a:hover { color: #2563eb; }

/* ===== Equation boxes ===== */
.eq-box {
    background: #ffffff;
    border: 1px solid rgba(100,116,139,0.12);
    border-radius: 16px;
    padding: 2.5rem 2rem;
    margin-bottom: 2rem;
    text-align: center;
    overflow-x: auto;
}
.eq-note { font-size: 0.8rem; color: #94a3b8; margin-top: 0.6rem; }

/* ===== Code blocks ===== */
.code-block {
    background: #ffffff;
    color: #334155;
    border: 1px solid rgba(100,116,139,0.18);
    border-radius: 12px;
    padding: 1.4rem 1.6rem;
    font-family: Consolas, 'Courier New', monospace;
    font-size: 0.88rem;
    overflow-x: auto;
    text-align: left;
    line-height: 1.7;
    margin: 1.5rem 0;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.code-block .cm { color: #94a3b8; }
.code-block-scroll { max-height: 560px; overflow-y: auto; }

/* ===== Page figures ===== */
.page-figure {
    background: #0f172a;
    border-radius: 16px;
    padding: 0.8rem;
    margin: 2rem auto;
    max-width: 780px;
    box-shadow: 0 12px 40px rgba(2,6,23,0.35);
}
.page-figure img {
    width: 100%; height: auto;
    border-radius: 10px;
    display: block;
}
.page-figure figcaption {
    text-align: center; color: #94a3b8;
    font-size: 0.85rem; padding: 0.7rem 0.5rem 0.3rem;
}
.page-figure.light {
    background: #ffffff;
    border: 1px solid rgba(100,116,139,0.12);
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.page-figure.light figcaption { color: #64748b; }

/* ===== Result tables ===== */
.result-table-wrap {
    max-width: 860px;
    margin: 1.5rem auto 2rem;
    background: #ffffff;
    border: 1px solid rgba(100,116,139,0.12);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.result-table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
.result-table caption {
    caption-side: top; text-align: center;
    color: #64748b; font-size: 0.88rem;
    padding: 0.9rem 1rem 0.2rem;
}
.result-table th, .result-table td {
    padding: 0.7rem 1.1rem;
    text-align: left;
    border-bottom: 1px solid rgba(100,116,139,0.1);
    color: #334155;
}
.result-table thead th { background: rgba(37,99,235,0.05); color: #1e293b; font-weight: 600; }
.result-table tbody tr:last-child td { border-bottom: none; }
.result-table tbody tr:hover { background: rgba(37,99,235,0.03); }
.result-table .num { font-variant-numeric: tabular-nums; white-space: nowrap; }
.result-table .best { color: #2563eb; font-weight: 700; }
.result-table .params { color: #64748b; font-size: 0.85rem; }

/* ===== KaTeX tweaks ===== */
.katex-display { margin: 0.5rem 0; overflow-x: auto; overflow-y: hidden; padding: 0.25rem 0; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.2rem; }
    .section-title { font-size: 1.8rem; }
    .nav-logo { font-size: 1.05rem; }
    .nav-links { gap: 1rem; }
    .nav-links a { font-size: 0.85rem; }
    .feature-grid { grid-template-columns: 1fr; }
    .usecase-grid { grid-template-columns: 1fr 1fr; }
    .stats-bar { gap: 1.2rem; }
    .stat-number { font-size: 1.8rem; }
    .page-title { font-size: 1.8rem; }
}
@media (max-width: 480px) {
    .usecase-grid { grid-template-columns: 1fr; }
    .hero h1 { font-size: 1.7rem; }
}

/* ===== Effects ===== */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}
.reveal { opacity: 1; }
body.js .reveal { opacity: 0; }
body.js .reveal.in {
    opacity: 1;
    animation: fadeUp 0.5s cubic-bezier(.22,.61,.36,1) backwards;
}
.hero-stars {
    position: absolute; inset: 0;
    width: 100%; height: 100%;
    pointer-events: none; z-index: 0;
}
.references-list a {
    color: #2563eb; text-decoration: none;
    border-bottom: 1px dashed rgba(37,99,235,0.45);
    transition: background 0.25s, border-color 0.25s;
}
.references-list a:hover {
    background: rgba(37,99,235,0.07);
    border-bottom-color: #2563eb;
}

/* ===== Extra Effects ===== */
#merger {
    width: 100%; max-width: 460px; height: auto;
    border-radius: 16px;
    box-shadow: 0 12px 40px rgba(2,6,23,0.35);
    display: block; margin: 0 auto;
}
.progress-bar {
    position: fixed; top: 0; left: 0; height: 3px; width: 0;
    background: linear-gradient(90deg, #2563eb, #7c3aed);
    z-index: 1100; pointer-events: none;
}
nav.scrolled {
    background: rgba(255,255,255,0.96);
    box-shadow: 0 2px 20px rgba(0,0,0,0.07);
}
.nav-links a.active { color: #2563eb; }
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: translateY(0); }
}
.hero-badge, .hero h1, .hero .subtitle, .hero-buttons, .hero-links {
    opacity: 0;
    animation: fadeInUp 0.7s ease forwards;
}
.hero-badge    { animation-delay: 0.10s; }
.hero h1       { animation-delay: 0.25s; }
.hero .subtitle{ animation-delay: 0.40s; }
.hero-buttons  { animation-delay: 0.55s; }
.hero-links    { animation-delay: 0.70s; }
.hero-links {
    display: flex; gap: 0.7rem; justify-content: center;
    flex-wrap: wrap; margin-top: 1.6rem;
}
.hero-links a {
    font-size: 0.83rem; color: #475569; text-decoration: none;
    padding: 0.32rem 1.05rem; border-radius: 50px;
    border: 1px solid rgba(100,116,139,0.28);
    transition: all 0.3s;
}
.hero-links a:hover {
    color: #2563eb; border-color: #2563eb;
    background: rgba(37,99,235,0.06);
    transform: translateY(-2px);
}
#back-top {
    position: fixed; right: 1.5rem; bottom: 1.5rem;
    width: 46px; height: 46px; border-radius: 50%;
    background: linear-gradient(135deg, #2563eb, #7c3aed);
    color: #fff; border: none; cursor: pointer;
    font-size: 1.15rem; line-height: 1;
    box-shadow: 0 4px 16px rgba(59,130,246,0.3);
    opacity: 0; visibility: hidden; transform: translateY(10px);
    transition: opacity 0.3s, transform 0.3s, visibility 0.3s;
    z-index: 1100;
}
#back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
#back-top:hover { transform: translateY(-3px); }
@media (prefers-reduced-motion: reduce) {
    .hero-badge, .hero h1, .hero .subtitle, .hero-buttons,
    body.js .reveal.in { animation: none !important; opacity: 1 !important; }
    html { scroll-behavior: auto; }
}