/* =========================================================
   九游赛场 · 共享样式 /assets/site.css
   01 重置  02 变量  03 基础与中文排版  04 布局骨架
   05 通用组件  06 页头  07 页脚  08 工具类  09 响应式  10 动效
   ========================================================= */

/* ---------- 01 重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd, hr {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }

img, svg, video, canvas { max-width: 100%; }

button { font: inherit; color: inherit; background: none; border: 0; }

a { color: inherit; }

/* ---------- 02 变量 ---------- */
:root {
  --ink-0: #030B09;
  --ink-1: #071713;
  --ink-2: #0D2A22;
  --cyan: #35F1C8;
  --cyan-soft: #8AF7DF;
  --flame: #FF5A36;
  --flame-soft: #FFB27A;
  --paper: #F4FFFB;
  --mist: #9AB8B0;
  --glass: rgba(255, 255, 255, 0.08);
  --glass-line: rgba(255, 255, 255, 0.14);
  --cyan-line: rgba(53, 241, 200, 0.22);
  --flame-line: rgba(255, 90, 54, 0.35);

  --wrap: 1200px;
  --gutter: clamp(1.15rem, 4vw, 3rem);
  --header-h: 76px;
  --radius: 20px;
  --radius-sm: 10px;
  --radius-pill: 999px;
  --sect: clamp(3.5rem, 8vw, 7rem);

  --font-display: "Arial Narrow", "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  --font-data: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, "Courier New", monospace;

  --shadow-lift: 0 28px 60px -34px rgba(0, 0, 0, 0.9);
  --speed: 0.32s;
}

/* ---------- 03 基础与中文排版 ---------- */
body {
  min-height: 100vh;
  overflow-x: hidden;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  background-color: var(--ink-1);
  background-image:
    linear-gradient(rgba(53, 241, 200, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(53, 241, 200, 0.04) 1px, transparent 1px),
    radial-gradient(1100px 620px at 88% -8%, rgba(53, 241, 200, 0.17), transparent 62%),
    radial-gradient(820px 560px at -8% 12%, rgba(255, 90, 54, 0.12), transparent 60%),
    linear-gradient(180deg, #071713 0%, #061310 52%, #030B09 100%);
  background-size: 72px 72px, 72px 72px, auto, auto, auto;
  background-repeat: repeat, repeat, no-repeat, no-repeat, no-repeat;
  background-attachment: fixed;
}

body::after {
  content: "";
  position: fixed;
  inset: auto 0 0 0;
  height: 34vh;
  pointer-events: none;
  z-index: 0;
  background: linear-gradient(180deg, transparent, rgba(3, 11, 9, 0.55));
}

h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; }

::selection { background: var(--cyan); color: var(--ink-0); }

.display {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(3rem, 8vw, 7rem);
  line-height: 1.02;
  letter-spacing: -0.025em;
}

.title-l {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 4.4vw, 3.2rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.title-m {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.25rem, 2.1vw, 1.6rem);
  line-height: 1.28;
}

.lede {
  max-width: 38ch;
  color: var(--mist);
  font-size: clamp(1rem, 1.35vw, 1.12rem);
  line-height: 1.8;
}

.prose {
  max-width: 38em;
  color: rgba(244, 255, 251, 0.88);
  line-height: 1.8;
}

.prose p + p { margin-top: 1.05em; }
.prose h2 { margin-top: 1.8em; margin-bottom: 0.6em; font-size: clamp(1.3rem, 2.2vw, 1.7rem); }
.prose h3 { margin-top: 1.5em; margin-bottom: 0.5em; font-size: 1.15rem; }
.prose ul, .prose ol { margin: 1em 0; padding-left: 1.2em; list-style: disc; }
.prose li + li { margin-top: 0.4em; }
.prose a { color: var(--cyan); text-decoration: none; border-bottom: 1px solid var(--cyan-line); }
.prose a:hover { color: var(--cyan-soft); border-bottom-color: var(--cyan); }
.prose strong { color: var(--paper); }

.data {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--cyan);
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  display: block;
  width: 26px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 04 布局骨架 ---------- */
.container {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow { max-width: 860px; }
.container--wide { max-width: 1440px; }

.section { padding-block: var(--sect); }
.section--tight { padding-block: clamp(2rem, 5vw, 3.5rem); }

.grid {
  display: grid;
  gap: clamp(1rem, 2.4vw, 1.75rem);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.rule {
  height: 1px;
  border: 0;
  margin-block: clamp(1.5rem, 4vw, 2.5rem);
  background: linear-gradient(90deg, var(--cyan-line), rgba(255, 255, 255, 0.04) 60%, transparent);
}

/* ---------- 05 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.72rem 1.35rem;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: transform var(--speed) ease, background var(--speed) ease,
              color var(--speed) ease, border-color var(--speed) ease, box-shadow var(--speed) ease;
}

.btn--accent {
  background: var(--flame);
  color: #210802;
  box-shadow: 0 16px 32px -18px rgba(255, 90, 54, 0.95);
}
.btn--accent:hover { background: var(--flame-soft); transform: translateY(-2px); }

.btn--cyan { background: var(--cyan); color: #04211A; }
.btn--cyan:hover { background: var(--cyan-soft); transform: translateY(-2px); }

.btn--ghost {
  border-color: var(--cyan-line);
  background: var(--glass);
  color: var(--cyan-soft);
}
.btn--ghost:hover { border-color: var(--cyan); background: rgba(53, 241, 200, 0.12); color: var(--paper); }

.btn--quiet { border-color: var(--glass-line); color: var(--mist); }
.btn--quiet:hover { border-color: var(--cyan-line); color: var(--paper); }

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: clamp(1.1rem, 2.4vw, 1.7rem);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
  background: var(--ink-2);
  transition: transform var(--speed) ease, border-color var(--speed) ease, box-shadow var(--speed) ease;
}

.card:hover { transform: translateY(-4px); border-color: var(--cyan-line); box-shadow: var(--shadow-lift); }

.card--glass {
  background: var(--glass);
  backdrop-filter: blur(12px) saturate(140%);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
}

.card--accent {
  border-color: var(--flame-line);
  background: linear-gradient(158deg, rgba(255, 90, 54, 0.16), rgba(13, 42, 34, 0.94) 58%);
}

.card__meta {
  color: var(--mist);
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.card__title { font-family: var(--font-display); font-weight: 700; font-size: clamp(1.15rem, 1.8vw, 1.45rem); line-height: 1.26; }
.card__title a { text-decoration: none; }
.card__title a:hover { color: var(--cyan); }
.card__body { color: rgba(244, 255, 251, 0.78); font-size: 0.95rem; }

.stat { display: flex; flex-direction: column; gap: 0.15rem; }
.stat__value {
  color: var(--cyan);
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.1;
}
.stat__label { color: var(--mist); font-size: 0.78rem; letter-spacing: 0.08em; }
.stat--flame .stat__value { color: var(--flame); }

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.22rem 0.62rem;
  border: 1px solid var(--cyan-line);
  border-radius: var(--radius-pill);
  background: rgba(53, 241, 200, 0.08);
  color: var(--cyan-soft);
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
}

.tag--flame {
  border-color: var(--flame-line);
  background: rgba(255, 90, 54, 0.12);
  color: var(--flame-soft);
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.filter-btn {
  padding: 0.45rem 0.95rem;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-pill);
  background: var(--glass);
  color: var(--mist);
  font-family: var(--font-data);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: color var(--speed) ease, border-color var(--speed) ease, background var(--speed) ease;
}

.filter-btn:hover { color: var(--paper); border-color: var(--cyan-line); }
.filter-btn[aria-pressed="true"] { background: var(--cyan); border-color: var(--cyan); color: #04211A; }

[data-filter-item][hidden] { display: none; }

.index-list { border-top: 1px solid var(--glass-line); }

.index-item {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 1rem 0.25rem;
  border-bottom: 1px solid var(--glass-line);
  color: var(--paper);
  text-decoration: none;
  transition: background var(--speed) ease, padding var(--speed) ease, color var(--speed) ease;
}

.index-item:hover { padding-left: 0.8rem; background: rgba(53, 241, 200, 0.06); color: var(--cyan-soft); }
.index-item__num { flex: 0 0 auto; color: var(--cyan); font-family: var(--font-data); font-size: 0.78rem; letter-spacing: 0.1em; }
.index-item__title { flex: 1 1 auto; font-weight: 600; }
.index-item__meta { flex: 0 0 auto; color: var(--mist); font-family: var(--font-data); font-size: 0.72rem; }

.note {
  padding: 0.35rem 0 0.35rem 1rem;
  border-left: 2px solid var(--cyan);
  color: var(--mist);
  font-size: 0.9rem;
}

.note--flame { border-left-color: var(--flame); }

.bar {
  height: 6px;
  overflow: hidden;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.08);
}

.bar__fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--cyan), var(--cyan-soft));
}

.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(53, 241, 200, 0.14), rgba(7, 23, 19, 0.2) 45%),
    linear-gradient(160deg, #0D2A22, #071713 60%, #123a30);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, transparent 42%, rgba(3, 11, 9, 0.74));
}

.media-frame img,
.media-frame svg,
.media-frame video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--21x9 { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }

.media-frame__caption {
  position: absolute;
  left: 1rem;
  bottom: 0.85rem;
  z-index: 2;
  color: var(--cyan-soft);
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  color: var(--mist);
  font-family: var(--font-data);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
}

.breadcrumbs a { text-decoration: none; border-bottom: 1px solid transparent; }
.breadcrumbs a:hover { color: var(--cyan); border-bottom-color: var(--cyan); }
.breadcrumbs__sep { color: rgba(154, 184, 176, 0.5); }
.breadcrumbs__item[aria-current="page"] { color: var(--cyan-soft); }

/* ---------- 06 页头 ---------- */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -120px;
  z-index: 200;
  padding: 0.65rem 1.1rem;
  border-radius: 0 0 12px 12px;
  background: var(--cyan);
  color: #04211A;
  font-weight: 700;
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-link:focus { top: 0; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(7, 23, 19, 0.84);
  border-bottom: 1px solid var(--cyan-line);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  width: 100%;
  max-width: var(--wrap);
  min-height: var(--header-h);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  flex: 0 0 auto;
  color: var(--paper);
  text-decoration: none;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(145deg, var(--cyan), #0F8C74);
  color: var(--ink-0);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -0.04em;
  box-shadow: 0 0 0 1px rgba(53, 241, 200, 0.4), 0 12px 26px -16px rgba(53, 241, 200, 0.9);
}

.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__name { font-family: var(--font-display); font-weight: 800; font-size: 1.15rem; letter-spacing: 0.02em; }
.brand__note { color: var(--cyan); font-family: var(--font-data); font-size: 0.64rem; letter-spacing: 0.16em; text-transform: uppercase; }

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.4vw, 2.2rem);
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0.5rem, 1.3vw, 1.25rem);
  counter-reset: navidx;
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0.55rem 0.1rem;
  color: var(--mist);
  font-size: 0.94rem;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--speed) ease;
}

.site-nav__link::before {
  counter-increment: navidx;
  content: counter(navidx, decimal-leading-zero);
  transform: translateY(-0.35em);
  color: rgba(138, 247, 223, 0.55);
  font-family: var(--font-data);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.1rem;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--speed) ease;
}

.site-nav__link:hover,
.site-nav__link:focus-visible { color: var(--paper); }
.site-nav__link:hover::after,
.site-nav__link:focus-visible::after { transform: scaleX(1); }

.site-nav__link[aria-current="page"] { color: var(--cyan); }
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); background: var(--flame); }

.site-nav__utility {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-left: clamp(0.75rem, 2vw, 1.5rem);
  border-left: 1px solid var(--glass-line);
}

.link-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--cyan-line);
  border-radius: var(--radius-pill);
  background: var(--glass);
  color: var(--cyan-soft);
  font-family: var(--font-data);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: background var(--speed) ease, color var(--speed) ease, border-color var(--speed) ease;
}

.link-chip:hover { background: rgba(53, 241, 200, 0.14); border-color: var(--cyan); color: var(--paper); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--cyan-line);
  border-radius: var(--radius-pill);
  background: var(--glass);
  color: var(--paper);
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  cursor: pointer;
}

.nav-toggle__bars { display: grid; gap: 4px; width: 18px; }
.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  transition: transform var(--speed) ease, opacity var(--speed) ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.header-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--flame));
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
}

/* ---------- 07 页脚 ---------- */
.site-footer {
  position: relative;
  z-index: 1;
  margin-top: var(--sect);
  border-top: 1px solid var(--cyan-line);
  background: linear-gradient(180deg, #062018 0%, #030B09 68%, #030B09 100%);
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, 0.78fr)) minmax(0, 1.05fr);
  gap: clamp(2rem, 4vw, 3rem);
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(2.5rem, 6vw, 4.5rem) var(--gutter) clamp(2rem, 4vw, 3rem);
}

.footer-lede {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
  max-width: 34ch;
}

.footer-tag {
  color: var(--cyan);
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.footer-brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 4vw, 2.7rem);
  line-height: 1;
  letter-spacing: -0.02em;
}

.footer-about { color: var(--mist); font-size: 0.94rem; }

.footer-col { display: flex; flex-direction: column; }

.footer-col__title {
  margin-bottom: 1rem;
  color: var(--cyan-soft);
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.footer-col__list { display: grid; gap: 0.55rem; }

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  width: fit-content;
  color: var(--mist);
  font-size: 0.92rem;
  text-decoration: none;
  transition: color var(--speed) ease;
}

.footer-link::before {
  content: "";
  width: 0;
  height: 2px;
  background: var(--cyan);
  transition: width var(--speed) ease;
}

.footer-link:hover { color: var(--paper); }
.footer-link:hover::before { width: 14px; }

.footer-contact { display: grid; gap: 0.85rem; align-content: start; }
.footer-contact__item { display: grid; gap: 0.15rem; }
.footer-contact__label {
  color: var(--cyan);
  font-family: var(--font-data);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.footer-contact__value { color: var(--paper); font-size: 0.92rem; line-height: 1.6; }
.footer-note { color: var(--mist); font-size: 0.82rem; line-height: 1.7; }

.footer-legal {
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
  border-top: 1px solid var(--glass-line);
  background: rgba(0, 0, 0, 0.3);
}

.footer-legal__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 1.1rem var(--gutter);
  color: var(--mist);
  font-family: var(--font-data);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
}

/* ---------- 08 工具类 ---------- */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

:where(a, button, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- 09 响应式 ---------- */
@media (max-width: 1180px) {
  .footer-inner { grid-template-columns: minmax(0, 1.2fr) repeat(2, minmax(0, 1fr)); }
  .footer-lede { grid-column: 1 / -1; max-width: 46ch; }
}

@media (max-width: 1080px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 70;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: 84vh;
    overflow-y: auto;
    padding: 1.2rem var(--gutter) calc(1.5rem + env(safe-area-inset-bottom));
    border-top: 1px solid var(--cyan);
    border-radius: 22px 22px 0 0;
    background: linear-gradient(180deg, rgba(13, 42, 34, 0.98), rgba(3, 11, 9, 0.99));
    box-shadow: 0 -34px 70px -34px rgba(0, 0, 0, 0.95);
    transform: translateY(112%);
    visibility: hidden;
    transition: transform 0.38s cubic-bezier(0.2, 0.8, 0.2, 1), visibility 0.38s ease;
  }

  .site-nav[data-open="true"] { transform: translateY(0); visibility: visible; }

  html[data-nav-open="true"] { overflow: hidden; }

  .site-nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .site-nav__link {
    justify-content: flex-start;
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--glass-line);
    font-size: 1.05rem;
  }
  .site-nav__link::after { display: none; }

  .site-nav__utility {
    flex-direction: column;
    align-items: stretch;
    gap: 0.7rem;
    margin-top: 0.9rem;
    padding: 1.1rem 0 0;
    border-left: 0;
    border-top: 1px solid var(--glass-line);
  }
  .site-nav__utility .btn { width: 100%; }
  .link-chip { justify-content: center; }
}

@media (max-width: 1000px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
  :root { --header-h: 66px; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .footer-inner { grid-template-columns: minmax(0, 1fr); }
  .footer-lede { grid-column: auto; }
  .brand__mark { width: 32px; height: 32px; font-size: 0.98rem; }
  .index-item { flex-wrap: wrap; gap: 0.35rem 0.8rem; }
  .index-item__meta { flex: 1 0 100%; }
}

/* ---------- 10 动效 ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
}

html.js [data-reveal].is-visible { opacity: 1; transform: none; }

html.js [data-reveal="bar"] {
  opacity: 1;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}

html.js [data-reveal="bar"].is-visible { transform: scaleX(1); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  html.js [data-reveal],
  html.js [data-reveal="bar"] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .card:hover, .btn:hover { transform: none; }
}