/* =============================================================================
   闪电科技团队 · 设计系统
   风格：极简、克制、以内容为中心 —— 大留白、细边框、黑白灰
   字体：MiSans（全站统一）
   目录：
     01 Tokens          02 Base            03 Layout
     04 Primitives      05 Navigation      06 Page head
     07 Cards & grids   08 Lists           09 Stats
     10 Callout / CTA   11 Footer          12 Dialogs
     13 Utilities       14 Responsive
   ========================================================================== */

/* ===== 01 Tokens ===== */
:root {
    --bg: #ffffff;
    --bg-soft: #f9f9f9;
    --bg-mute: #f2f2f2;
    --fg: #0d0d0d;
    --fg-secondary: #5d5d5d;
    --fg-tertiary: #8f8f8f;
    --line: #e5e5e5;
    --line-soft: #efefef;
    --ink: #0d0d0d;
    --ink-hover: #292929;
    --ok: #10a37f;

    --r-xs: 8px;
    --r-sm: 12px;
    --r-md: 16px;
    --r-lg: 24px;
    --r-full: 999px;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.04), 0 16px 40px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.05), 0 32px 72px rgba(0, 0, 0, 0.10);

    --ease: cubic-bezier(0.22, 1, 0.36, 1);
    --dur: 0.24s;
    --t: var(--dur) var(--ease);

    --shell: 1200px;
    --nav-h: 72px;
    --font: "MiSans VF", "MiSans", -apple-system, BlinkMacSystemFont, "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

/* ===== 02 Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; font-family: var(--font); }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--fg);
    font-size: 16px;
    line-height: 1.7;
    letter-spacing: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

h1, h2, h3, h4 { font-weight: 600; line-height: 1.2; letter-spacing: -0.01em; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
img, svg { display: block; }
::selection { background: var(--ink); color: var(--bg); }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; border-radius: 4px; }

/* ===== 03 Layout ===== */
.shell { width: 100%; max-width: var(--shell); margin: 0 auto; padding: 0 24px; }
.shell-narrow { max-width: 860px; }

.band { padding: 144px 0; }
.band-sm { padding: 96px 0; }
.band-soft { background: var(--bg-soft); border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); }
.band-line { border-top: 1px solid var(--line-soft); }

.stack-40 { display: flex; flex-direction: column; gap: 40px; }

/* ===== 04 Primitives ===== */
.icon { width: 20px; height: 20px; flex: none; stroke: currentColor; fill: none; }
.icon-sm { width: 16px; height: 16px; }

.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 9px;
    font-size: 15px; font-weight: 500;
    border-radius: var(--r-full); border: 1px solid transparent;
    cursor: pointer; white-space: nowrap;
    transition: background var(--t), color var(--t), border-color var(--t),
                transform var(--t), box-shadow var(--t);
}
.btn-lg { padding: 14px 28px; font-size: 15.5px; }
.btn-md { padding: 10px 20px; font-size: 14.5px; }
.btn-sm { padding: 7px 15px; font-size: 13.5px; }

.btn-solid { background: var(--ink); color: #fff; }
.btn-solid:hover { background: var(--ink-hover); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-solid:active { transform: translateY(0); box-shadow: none; }

.btn-outline { background: var(--bg); color: var(--fg); border-color: var(--line); }
.btn-outline:hover { background: var(--bg-soft); border-color: #d0d0d0; }

.btn-inverse { background: #fff; color: var(--ink); }
.btn-inverse:hover { transform: translateY(-1px); box-shadow: 0 16px 40px rgba(0, 0, 0, 0.30); }

.eyebrow {
    display: inline-flex; align-items: center; gap: 9px;
    font-size: 13px; font-weight: 500; color: var(--fg-secondary);
    border: 1px solid var(--line); background: var(--bg);
    border-radius: var(--r-full); padding: 6px 16px 6px 12px;
}
.eyebrow .mark { width: 6px; height: 6px; border-radius: 50%; background: var(--ok); flex: none; box-shadow: 0 0 0 3px rgba(16, 163, 127, 0.14); }

.kicker {
    display: block; font-size: 12.5px; font-weight: 500; letter-spacing: 0.14em;
    text-transform: uppercase; color: var(--fg-tertiary); margin-bottom: 20px;
}

.tag {
    display: inline-block; font-size: 12px; color: var(--fg-tertiary);
    border: 1px solid var(--line-soft); border-radius: var(--r-full); padding: 3px 12px;
}
.tag-solid { background: var(--ink); color: #fff; border-color: var(--ink); }

.arrow-link {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 14.5px; font-weight: 500; color: var(--fg);
    border-bottom: 1px solid var(--line); padding-bottom: 2px;
    transition: border-color var(--t), gap var(--t);
}
.arrow-link:hover { border-color: var(--fg); gap: 12px; }
.arrow-link .icon { width: 15px; height: 15px; }

.rule { height: 1px; background: var(--line-soft); border: 0; }

/* ===== 05 Navigation ===== */
.nav {
    position: sticky; top: 0; z-index: 90;
    background: rgba(255, 255, 255, 0.78);
    backdrop-filter: saturate(180%) blur(18px);
    -webkit-backdrop-filter: saturate(180%) blur(18px);
    border-bottom: 1px solid transparent;
    transition: border-color var(--t);
}
.nav.is-pinned { border-bottom-color: var(--line); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; height: var(--nav-h); }

.brand { display: inline-flex; align-items: center; gap: 12px; flex: none; }
.brand-mark {
    width: 34px; height: 34px; flex: none; border-radius: 10px; background: var(--ink);
    display: flex; align-items: center; justify-content: center; overflow: hidden;
}
.brand-mark svg { width: 100%; height: 100%; }
.brand-mark img { width: 100%; height: 100%; object-fit: cover; }
.brand-text { font-size: 16px; font-weight: 600; letter-spacing: -0.01em; }
.brand-text span { color: var(--fg-tertiary); font-weight: 400; margin-left: 6px; font-size: 14px; }

.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-link {
    font-size: 14.5px; font-weight: 450; color: var(--fg-secondary);
    padding: 9px 14px; border-radius: var(--r-xs); cursor: pointer;
    transition: color var(--t), background var(--t);
}
.nav-link:hover { color: var(--fg); background: var(--bg-mute); }
.nav-link.is-current { color: var(--fg); font-weight: 600; }
.nav-cta { margin-left: 12px; }

.nav-toggle {
    display: none; width: 40px; height: 40px; flex: none;
    align-items: center; justify-content: center;
    background: transparent; border: 1px solid var(--line); border-radius: var(--r-xs);
    cursor: pointer;
}
.nav-toggle .icon { width: 18px; height: 18px; }

/* ===== 06 Page head ===== */
.hero { padding: 132px 0 84px; text-align: center; }
.hero .eyebrow { margin-bottom: 32px; }
.hero h1 { font-size: clamp(40px, 5.8vw, 72px); margin-bottom: 28px; letter-spacing: -0.02em; }
.hero h1 .soft { color: var(--fg-tertiary); }
.hero-lede {
    font-size: clamp(16.5px, 1.8vw, 20px); color: var(--fg-secondary);
    max-width: 660px; margin: 0 auto 44px; line-height: 1.8;
}
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero-foot { margin-top: 22px; font-size: 13.5px; color: var(--fg-tertiary); }

.hero-left { padding: 128px 0 96px; text-align: left; }
.hero-left h1 { font-size: clamp(38px, 5vw, 62px); }
.hero-left .hero-lede { margin: 0 0 40px; max-width: 600px; }
.hero-left .hero-actions { justify-content: flex-start; }

.page-head { padding: 116px 0 72px; text-align: center; }
.page-head h1 { font-size: clamp(34px, 4.6vw, 56px); margin-bottom: 22px; letter-spacing: -0.02em; }
.page-head p { font-size: clamp(16px, 1.7vw, 19px); color: var(--fg-secondary); max-width: 640px; margin: 0 auto; line-height: 1.8; }
.page-head .kicker { margin-bottom: 20px; }

.section-head { max-width: 680px; margin: 0 auto 76px; text-align: center; }
.section-head h2 { font-size: clamp(30px, 3.8vw, 44px); margin-bottom: 18px; letter-spacing: -0.015em; }
.section-head p { font-size: 18px; color: var(--fg-secondary); line-height: 1.8; }
.section-head--left { margin-left: 0; text-align: left; }

/* ===== 07 Cards & grids ===== */
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
    background: var(--bg); border: 1px solid var(--line); border-radius: var(--r-lg);
    padding: 42px 38px 44px;
    transition: border-color var(--t), box-shadow var(--t), transform var(--t);
}
.card-lift:hover { border-color: #d8d8d8; box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card-tight { padding: 32px 30px 34px; }
.card-flat { background: var(--bg-soft); border-color: var(--line-soft); }

.card .glyph {
    width: 46px; height: 46px; border-radius: 13px; margin-bottom: 28px;
    border: 1px solid var(--line); background: var(--bg-soft);
    display: flex; align-items: center; justify-content: center; color: var(--fg);
}
.card h3 { font-size: 17px; margin-bottom: 10px; }
.card p { font-size: 15px; color: var(--fg-secondary); line-height: 1.8; }
.card .tag { margin-top: 22px; }

/* 项目卡：首页主打 */
.project-card {
    display: flex; flex-direction: column;
    background: var(--bg); border: 1px solid var(--line); border-radius: var(--r-lg);
    padding: 48px 44px 44px; overflow: hidden; position: relative;
    transition: border-color var(--t), box-shadow var(--t), transform var(--t);
}
.project-card:hover { border-color: #d5d5d5; box-shadow: var(--shadow-lg); transform: translateY(-3px); }
.project-card .p-head { display: flex; align-items: center; gap: 16px; margin-bottom: 26px; }
.project-card .p-mark {
    width: 56px; height: 56px; flex: none; border-radius: 16px; overflow: hidden;
    border: 1px solid var(--line); background: var(--bg-soft);
    display: flex; align-items: center; justify-content: center;
}
.project-card .p-mark img { width: 100%; height: 100%; object-fit: cover; }
.project-card .p-mark svg { width: 100%; height: 100%; }
.project-card .p-name { font-size: 21px; font-weight: 600; letter-spacing: -0.01em; }
.project-card .p-kind { font-size: 13.5px; color: var(--fg-tertiary); margin-top: 2px; }
.project-card h3 { font-size: 26px; margin-bottom: 14px; letter-spacing: -0.015em; }
.project-card p { font-size: 15.5px; color: var(--fg-secondary); line-height: 1.85; margin-bottom: 26px; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 30px; }
.chip {
    font-size: 12.5px; color: var(--fg-secondary);
    border: 1px solid var(--line); border-radius: var(--r-full); padding: 5px 14px;
}
.project-card .p-foot { margin-top: auto; display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }

/* ===== 08 Lists ===== */
.rows { border: 1px solid var(--line); border-radius: var(--r-lg); overflow: hidden; }
.row {
    display: flex; align-items: flex-start; gap: 28px;
    padding: 34px 38px; border-bottom: 1px solid var(--line-soft);
    transition: background var(--t);
}
.row:last-child { border-bottom: 0; }
.row:hover { background: var(--bg-soft); }
.row .no {
    flex: none; font-size: 14px; font-weight: 600; color: var(--fg-tertiary);
    font-variant-numeric: tabular-nums; padding-top: 4px; min-width: 24px;
}
.row .body { flex: 1; min-width: 0; }
.row .body h3 { font-size: 17px; margin-bottom: 10px; }
.row .body p { font-size: 15px; color: var(--fg-secondary); line-height: 1.8; }
.row .side { flex: none; color: var(--fg-tertiary); padding-top: 2px; }

.notes { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.note {
    background: var(--bg); border: 1px solid var(--line); border-radius: var(--r-lg);
    padding: 42px 40px; display: flex; gap: 24px;
}
.note .no { flex: none; font-size: 14px; font-weight: 600; color: var(--fg-tertiary); font-variant-numeric: tabular-nums; padding-top: 4px; }
.note h3 { font-size: 17px; margin-bottom: 10px; }
.note p { font-size: 15px; color: var(--fg-secondary); line-height: 1.8; }

/* ===== 09 Stats ===== */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); }
.stat { padding: 48px 28px; text-align: center; border-right: 1px solid var(--line-soft); }
.stat:last-child { border-right: 0; }
.stat .value { font-size: 36px; font-weight: 600; line-height: 1.1; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.stat .label { margin-top: 8px; font-size: 14px; color: var(--fg-tertiary); }

/* ===== 10 Callout / CTA ===== */
.callout {
    border: 1px solid var(--line); border-radius: var(--r-lg);
    padding: 44px 46px; background: var(--bg-soft);
    display: flex; align-items: center; gap: 32px; flex-wrap: wrap;
}
.callout .body { flex: 1; min-width: 260px; }
.callout h3 { font-size: 19px; margin-bottom: 8px; }
.callout p { font-size: 15px; color: var(--fg-secondary); line-height: 1.8; }

.cta-band { padding: 40px 0 144px; }
.cta {
    position: relative; overflow: hidden;
    background: var(--ink); border-radius: var(--r-lg);
    padding: 104px 48px; text-align: center;
}
.cta::after {
    content: ''; position: absolute; inset: 0; pointer-events: none;
    background: radial-gradient(560px 300px at 50% -10%, rgba(255, 255, 255, 0.14), transparent 70%);
}
.cta > * { position: relative; z-index: 1; }
.cta h2 { font-size: clamp(28px, 3.6vw, 42px); color: #fff; margin-bottom: 18px; letter-spacing: -0.015em; }
.cta p { font-size: 17.5px; color: rgba(255, 255, 255, 0.62); max-width: 520px; margin: 0 auto 40px; line-height: 1.8; }
.cta .hero-actions { justify-content: center; }
.cta .btn-outline { background: transparent; color: #fff; border-color: rgba(255, 255, 255, 0.28); }
.cta .btn-outline:hover { background: rgba(255, 255, 255, 0.08); border-color: rgba(255, 255, 255, 0.5); }
.cta .foot { margin: 26px 0 0; font-size: 13.5px; color: rgba(255, 255, 255, 0.42); }

/* ===== 11 Footer ===== */
.footer { border-top: 1px solid var(--line-soft); padding: 72px 0 56px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 56px; }
.footer-brand .brand { margin-bottom: 18px; }
.footer-brand p { font-size: 14px; color: var(--fg-tertiary); line-height: 1.8; max-width: 280px; }
.footer-col h4 { font-size: 13px; font-weight: 600; color: var(--fg); margin-bottom: 18px; letter-spacing: 0.02em; }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.footer-col a { font-size: 14px; color: var(--fg-secondary); transition: color var(--t); }
.footer-col a:hover { color: var(--fg); }
.footer-bottom {
    display: flex; align-items: center; justify-content: space-between;
    flex-wrap: wrap; gap: 20px; padding-top: 32px; border-top: 1px solid var(--line-soft);
    font-size: 13.5px; color: var(--fg-tertiary);
}
.footer-bottom nav { display: flex; gap: 26px; flex-wrap: wrap; }
.footer-bottom nav a { transition: color var(--t); }
.footer-bottom nav a:hover { color: var(--fg); }

/* ===== 12 Dialogs ===== */
.dialog {
    position: fixed; inset: 0; z-index: 200; display: none;
    align-items: center; justify-content: center; padding: 24px;
    background: rgba(13, 13, 13, 0.44);
    backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
}
.dialog.is-open { display: flex; animation: overlay-in 0.2s var(--ease); }
@keyframes overlay-in { from { opacity: 0; } to { opacity: 1; } }

.sheet {
    width: 100%; max-width: 640px; max-height: 86vh;
    display: flex; flex-direction: column; overflow: hidden;
    background: var(--bg); border: 1px solid var(--line);
    border-radius: var(--r-lg); box-shadow: var(--shadow-lg);
    animation: sheet-in 0.24s var(--ease);
}
@keyframes sheet-in { from { opacity: 0; transform: translateY(12px) scale(0.99); } to { opacity: 1; transform: none; } }

.sheet-head {
    display: flex; align-items: center; justify-content: space-between; gap: 12px;
    padding: 22px 28px; border-bottom: 1px solid var(--line-soft); flex: none;
}
.sheet-head h2 { font-size: 17px; }
.sheet-head .sub { display: block; font-size: 12.5px; font-weight: 400; color: var(--fg-tertiary); margin-top: 3px; }
.sheet-close {
    width: 34px; height: 34px; flex: none; border-radius: var(--r-xs);
    border: 1px solid transparent; background: transparent; cursor: pointer;
    color: var(--fg-secondary); display: flex; align-items: center; justify-content: center;
    transition: background var(--t), color var(--t);
}
.sheet-close:hover { background: var(--bg-mute); color: var(--fg); }
.sheet-close .icon { width: 18px; height: 18px; }
.sheet-body { padding: 20px 24px 24px; overflow-y: auto; flex: 1; }
.sheet-foot {
    display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
    padding: 18px 28px; border-top: 1px solid var(--line-soft); flex: none;
    font-size: 13px; color: var(--fg-tertiary);
}

/* ===== 13 Utilities ===== */
.center { text-align: center; }
.mt-0 { margin-top: 0; }
.mt-24 { margin-top: 24px; }
.mt-40 { margin-top: 40px; }
.mt-64 { margin-top: 64px; }
.mt-96 { margin-top: 96px; }
.placeholder { text-align: center; color: var(--fg-tertiary); font-size: 14px; padding: 48px 0; }

/* 文档排版（更新日志等） */
.doc { font-size: 15px; line-height: 1.9; color: var(--fg-secondary); }
.doc h1 { font-size: 24px; color: var(--fg); margin: 0 0 6px; }
.doc h2 { font-size: 16px; color: var(--fg); font-weight: 600; margin: 34px 0 12px; padding-bottom: 10px; border-bottom: 1px solid var(--line-soft); }
.doc h2:first-of-type { margin-top: 8px; }
.doc h3 { font-size: 13px; color: var(--fg-tertiary); font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; margin: 24px 0 10px; }
.doc ul { list-style: none; padding: 0; margin: 10px 0; }
.doc li { position: relative; padding-left: 20px; margin-bottom: 9px; }
.doc li::before { content: ''; position: absolute; left: 4px; top: 0.78em; width: 5px; height: 5px; border-radius: 50%; background: #cfcfcf; }
.doc p { margin: 12px 0; }
.doc strong { color: var(--fg); font-weight: 600; }
.doc blockquote { margin: 18px 0; padding: 16px 20px; background: var(--bg-soft); border: 1px solid var(--line-soft); border-radius: var(--r-sm); }
.doc blockquote p { margin: 0; }
.doc code { background: var(--bg-mute); padding: 2px 6px; border-radius: 6px; font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 0.88em; color: var(--fg); }
.doc pre { background: var(--ink); color: #eaeaea; padding: 18px 20px; border-radius: var(--r-sm); overflow-x: auto; margin: 16px 0; }
.doc pre code { background: transparent; padding: 0; color: inherit; }
.doc a { border-bottom: 1px solid var(--line); }
.doc a:hover { border-color: var(--fg); }
.doc table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14px; }
.doc th, .doc td { border: 1px solid var(--line-soft); padding: 9px 13px; text-align: left; }
.doc th { background: var(--bg-soft); color: var(--fg); font-weight: 600; }
.doc img { max-width: 100%; border-radius: var(--r-xs); }

/* ===== 14 Responsive ===== */
@media (max-width: 1024px) {
    .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
}

@media (max-width: 900px) {
    :root { --nav-h: 64px; }
    .band { padding: 96px 0; }
    .band-sm { padding: 72px 0; }
    .hero { padding: 88px 0 56px; }
    .hero-left { padding: 84px 0 64px; }
    .page-head { padding: 84px 0 56px; }
    .section-head { margin-bottom: 56px; }
    .notes { grid-template-columns: 1fr; }
    .stats { grid-template-columns: repeat(2, 1fr); }
    .stat:nth-child(2) { border-right: 0; }
    .stat:nth-child(1), .stat:nth-child(2) { border-bottom: 1px solid var(--line-soft); }
    .cta { padding: 76px 32px; }
    .cta-band { padding: 32px 0 96px; }
    .callout { padding: 34px 32px; }

    .nav-toggle { display: flex; }
    .nav-links {
        position: fixed; inset: var(--nav-h) 0 auto 0;
        flex-direction: column; align-items: stretch; gap: 2px;
        background: var(--bg); border-bottom: 1px solid var(--line);
        padding: 16px 20px 24px;
        display: none; box-shadow: var(--shadow-md);
    }
    .nav-links.is-open { display: flex; }
    .nav-link { padding: 13px 14px; font-size: 15.5px; }
    .nav-cta { margin: 12px 0 0; }
}

@media (max-width: 680px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .notes { grid-template-columns: 1fr; }
    .band { padding: 76px 0; }
    .hero { padding: 72px 0 48px; }
    .hero-left { padding: 68px 0 52px; }
    .page-head { padding: 68px 0 44px; }
    .section-head { margin-bottom: 44px; }
    .card, .note { padding: 32px 26px 34px; }
    .project-card { padding: 36px 26px 34px; }
    .project-card h3 { font-size: 22px; }
    .row { padding: 26px 24px; gap: 18px; }
    .stat { padding: 36px 20px; }
    .cta { padding: 64px 24px; }
    .cta-band { padding: 24px 0 80px; }
    .callout { padding: 30px 24px; }
    .footer { padding: 56px 0 44px; }
    .footer-grid { grid-template-columns: 1fr; gap: 36px; margin-bottom: 40px; }
    .footer-bottom { flex-direction: column; align-items: flex-start; }
    .dialog { padding: 12px; }
    .sheet { border-radius: 20px; max-height: 90vh; }
}

@media (max-width: 420px) {
    .shell { padding: 0 18px; }
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { width: 100%; }
    .nav-cta span { display: none; }
    .nav-cta { padding: 11px 14px; }
    .footer-bottom nav { gap: 18px; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
    html { scroll-behavior: auto; }
}