/* ===================================================
   安博赛场 /assets/site.css
   共享外壳：重置、变量、中文排版、头部、页脚、基础组件
   =================================================== */

/* ---------- 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, figure, blockquote, dl, dd {
  margin: 0;
}

ul, ol {
  padding: 0;
  list-style: none;
}

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

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

a { color: inherit; }

input, select, textarea { font: inherit; }

/* ---------- 变量 ---------- */
:root {
  --c-ink: #0B1D18;
  --c-ink-2: #122A24;
  --c-slate: #1E2A2E;
  --c-bone: #E9EFEA;
  --c-bone-soft: rgba(233, 239, 234, 0.82);
  --c-mist: #9FB0A8;
  --c-signal: #3DF2B6;
  --c-signal-deep: #12A87A;
  --c-amber: #FF8A3D;
  --c-amber-soft: #FFC79B;
  --c-violet: #7A6CF0;

  --line: rgba(159, 176, 168, 0.22);
  --line-soft: rgba(159, 176, 168, 0.12);
  --line-strong: rgba(159, 176, 168, 0.36);

  --font-display: "Barlow Condensed", "Oswald", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --font-mono: ui-monospace, "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;

  --maxw: 1240px;
  --gutter: clamp(18px, 4vw, 40px);
  --header-h: 78px;
  --header-h-scrolled: 62px;
  --cut: 18px;
  --cut-sm: 12px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--c-ink);
  background-image:
    radial-gradient(1100px 620px at 84% -14%, rgba(61, 242, 182, 0.10), transparent 62%),
    radial-gradient(820px 520px at -10% 26%, rgba(122, 108, 240, 0.09), transparent 58%),
    repeating-linear-gradient(90deg, rgba(233, 239, 234, 0.020) 0 1px, transparent 1px 76px),
    repeating-linear-gradient(0deg, rgba(233, 239, 234, 0.014) 0 1px, transparent 1px 64px);
  background-repeat: no-repeat, no-repeat, repeat, repeat;
  color: var(--c-bone);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: condensed;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--c-bone);
}

h1 { font-size: clamp(2.4rem, 6.4vw, 4.5rem); }
h2 { font-size: clamp(1.55rem, 3.4vw, 2rem); }
h3 { font-size: clamp(1.12rem, 2vw, 1.25rem); }

p { color: var(--c-bone-soft); }

a {
  color: var(--c-signal);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

strong { color: var(--c-bone); font-weight: 700; }

::selection {
  background: rgba(61, 242, 182, 0.28);
  color: var(--c-bone);
}

:focus-visible {
  outline: 2px solid var(--c-signal);
  outline-offset: 3px;
  border-radius: 2px;
}

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

.mono, .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.num {
  font-size: clamp(2rem, 3.6vw, 3.5rem);
  line-height: 1;
  color: var(--c-bone);
}

.num--signal { color: var(--c-signal); }
.num--amber { color: var(--c-amber); }

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -80px;
  z-index: 200;
  padding: 11px 20px;
  background: var(--c-signal);
  color: #06231A;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  transition: top 0.22s var(--ease);
}

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

.slant-divider {
  position: relative;
  height: clamp(28px, 4.5vw, 56px);
}

.slant-divider::before {
  content: "";
  position: absolute;
  left: 0; right: 0;
  top: 50%;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--line) 0 9px, transparent 9px 18px);
  transform: rotate(-0.7deg);
  transform-origin: 0 50%;
}

/* ---------- 容器与网格 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.section {
  padding-top: clamp(52px, 8vw, 108px);
  padding-bottom: clamp(52px, 8vw, 108px);
}

.section--tight {
  padding-top: clamp(30px, 4.5vw, 56px);
  padding-bottom: clamp(30px, 4.5vw, 56px);
}

#main-content { scroll-margin-top: calc(var(--header-h) + 12px); }

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}

.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }

/* ---------- 排版件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.22em;
  color: var(--c-mist);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--c-signal);
}

.display-title {
  font-family: var(--font-display);
  font-stretch: condensed;
  font-size: clamp(2.4rem, 6.4vw, 4.5rem);
  letter-spacing: -0.02em;
  line-height: 1.02;
  margin-bottom: 18px;
}

.section-title {
  font-family: var(--font-display);
  font-stretch: condensed;
  font-size: clamp(1.55rem, 3.4vw, 2rem);
  letter-spacing: -0.02em;
  line-height: 1.14;
  margin-bottom: 16px;
}

.card-title {
  font-family: var(--font-display);
  font-stretch: condensed;
  font-size: clamp(1.12rem, 2vw, 1.25rem);
  letter-spacing: -0.01em;
  margin-bottom: 8px;
}

.lede {
  max-width: 62ch;
  font-size: clamp(16.5px, 1.5vw, 19px);
  line-height: 1.8;
  color: rgba(233, 239, 234, 0.86);
}

.annotation {
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-mist);
}

/* ---------- 按钮 ---------- */
.btn {
  --btn-bg: transparent;
  --btn-fg: var(--c-bone);
  --btn-line: var(--line-strong);
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 22px;
  border: 1px solid var(--btn-line);
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.03em;
  text-decoration: none;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  transition: background-color 0.22s var(--ease), color 0.22s var(--ease),
              border-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.btn:hover { transform: translateY(-1px); }
.btn:focus-visible { outline-offset: -4px; }

.btn--primary {
  --btn-bg: var(--c-signal);
  --btn-fg: #06231A;
  --btn-line: var(--c-signal);
}
.btn--primary:hover {
  --btn-bg: #6bffc8;
  --btn-line: #6bffc8;
}

.btn--ghost:hover {
  --btn-line: var(--c-signal);
  --btn-fg: var(--c-signal);
  background: rgba(61, 242, 182, 0.08);
}

.btn--amber {
  --btn-bg: var(--c-amber);
  --btn-fg: #2A1206;
  --btn-line: var(--c-amber);
}
.btn--amber:hover { --btn-bg: var(--c-amber-soft); --btn-line: var(--c-amber-soft); }

.btn--wide { width: 100%; }

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  background: rgba(30, 42, 46, 0.6);
  color: var(--c-mist);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.7;
  letter-spacing: 0.06em;
  white-space: nowrap;
  text-decoration: none;
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.tag:hover { color: var(--c-bone); border-color: var(--line-strong); }

.tag--signal {
  color: var(--c-signal);
  border-color: rgba(61, 242, 182, 0.35);
  background: rgba(18, 168, 122, 0.12);
}

.tag--amber {
  color: var(--c-amber-soft);
  border-color: rgba(255, 138, 61, 0.4);
  background: rgba(255, 138, 61, 0.12);
}

.tag--violet {
  color: #B9B2FF;
  border-color: rgba(122, 108, 240, 0.42);
  background: rgba(122, 108, 240, 0.12);
}

.tag[aria-pressed="true"] {
  color: var(--c-ink);
  background: var(--c-signal);
  border-color: var(--c-signal);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

/* ---------- 面板 ---------- */
.panel {
  position: relative;
  padding: clamp(20px, 2.4vw, 28px);
  background: linear-gradient(158deg, var(--c-ink-2) 0%, rgba(30, 42, 46, 0.78) 100%);
  border: 1px solid var(--line-soft);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.panel--slate {
  background: linear-gradient(158deg, rgba(30, 42, 46, 0.96) 0%, rgba(18, 42, 36, 0.86) 100%);
}

.panel--amber {
  background: linear-gradient(158deg, rgba(255, 138, 61, 0.14) 0%, rgba(30, 42, 46, 0.7) 62%);
  border-color: rgba(255, 138, 61, 0.32);
}

.panel__label {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-serif);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--c-mist);
}

.panel__status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--c-signal);
}

.panel__status::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 4px rgba(61, 242, 182, 0.16);
}

.panel__status--amber {
  color: var(--c-amber);
}
.panel__status--amber::before {
  box-shadow: 0 0 0 4px rgba(255, 138, 61, 0.16);
}

.panel__status--idle {
  color: var(--c-mist);
}
.panel__status--idle::before {
  box-shadow: 0 0 0 4px rgba(159, 176, 168, 0.14);
}

/* ---------- 统计条带 ---------- */
.stat-strip {
  display: flex;
  overflow-x: auto;
  background: var(--c-slate);
  border: 1px solid var(--line-soft);
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.stat-strip__item {
  flex: 0 0 clamp(196px, 26vw, 272px);
  padding: 18px 20px 20px;
  border-right: 1px solid var(--line-soft);
  scroll-snap-align: start;
}

.stat-strip__item:last-child { border-right: 0; }

.stat-strip__track {
  margin-top: 12px;
  height: 6px;
  background: rgba(159, 176, 168, 0.14);
  overflow: hidden;
}

.stat-strip__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--c-signal), var(--c-signal-deep));
  transition: width 0.6s ease-out;
}

.stat-strip__bar--alt {
  background: linear-gradient(90deg, var(--c-violet), rgba(122, 108, 240, 0.35));
}

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--c-mist);
}

.breadcrumbs li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.breadcrumbs li + li::before {
  content: "／";
  color: rgba(159, 176, 168, 0.45);
}

.breadcrumbs a {
  color: var(--c-mist);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.breadcrumbs a:hover { color: var(--c-signal); }

/* ---------- 图片容器 ---------- */
.image-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background:
    linear-gradient(150deg, rgba(30, 42, 46, 0.95), rgba(11, 29, 24, 0.95)),
    repeating-linear-gradient(115deg, rgba(61, 242, 182, 0.06) 0 2px, transparent 2px 9px);
  border: 1px solid var(--line-soft);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.image-frame--wide { aspect-ratio: 16 / 9; }
.image-frame--tall { aspect-ratio: 3 / 4; }
.image-frame--square { aspect-ratio: 1 / 1; }
.image-frame--fill { aspect-ratio: 4 / 3; }

.image-frame > img,
.image-frame__media {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.image-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 26px 16px 12px;
  background: linear-gradient(180deg, rgba(11, 29, 24, 0) 0%, rgba(11, 29, 24, 0.9) 100%);
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-mist);
}

.image-frame--tall .image-frame__caption { padding-top: 40px; }

/* ---------- 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}

[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 滚动进度 ---------- */
.scroll-progress {
  position: absolute;
  left: 0;
  top: 0;
  height: 2px;
  width: 100%;
  transform: scaleX(var(--scroll, 0));
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--c-signal), var(--c-violet));
  opacity: 0.9;
  pointer-events: none;
}

/* ===================================================
   头部
   =================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 80;
  background-color: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.3s var(--ease), border-color 0.3s var(--ease);
}

.site-header[data-scrolled="true"] {
  background-color: rgba(11, 29, 24, 0.97);
  border-bottom-color: var(--line-soft);
}

.header__inner {
  position: relative;
  z-index: 2;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 30px);
  transition: height 0.3s var(--ease);
}

.site-header[data-scrolled="true"] .header__inner {
  height: var(--header-h-scrolled);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
  color: var(--c-bone);
  text-decoration: none;
}

.brand:hover { color: var(--c-bone); }

.brand__mark {
  width: 5px;
  height: 30px;
  background: linear-gradient(180deg, var(--c-signal), var(--c-signal-deep));
  clip-path: polygon(0 6px, 100% 0, 100% 100%, 0 calc(100% - 6px));
  transition: height 0.3s var(--ease);
}

.site-header[data-scrolled="true"] .brand__mark { height: 24px; }

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__line {
  font-family: var(--font-display);
  font-stretch: condensed;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--c-bone);
}

.brand__scene {
  font-family: var(--font-serif);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--c-mist);
}

/* 导航 */
.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 24px);
}

.nav__list {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.9vw, 24px);
}

.nav__link {
  position: relative;
  display: inline-block;
  padding: 9px 1px;
  color: var(--c-mist);
  font-size: 15px;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--c-signal);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.26s var(--ease);
}

.nav__link:hover { color: var(--c-bone); }
.nav__link:hover::after { transform: scaleX(0.4); }

.nav__link[aria-current="page"] { color: var(--c-bone); }
.nav__link[aria-current="page"]::after { transform: scaleX(1); }

.nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: -13px;
  top: 50%;
  width: 6px;
  height: 6px;
  margin-top: -3px;
  border-radius: 50%;
  background: var(--c-signal);
}

.header__cta { flex: 0 0 auto; }

.nav__cta-mobile { display: none; }

/* 移动菜单按钮 */
.nav-toggle {
  display: none;
  margin-left: auto;
  align-items: center;
  gap: 10px;
  padding: 10px 13px;
  border: 1px solid var(--line);
  background: rgba(30, 42, 46, 0.5);
  color: var(--c-bone);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
}

.nav-toggle__bars {
  position: relative;
  display: inline-block;
  width: 18px;
  height: 12px;
}

.nav-toggle__bars i {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform 0.26s var(--ease);
}

.nav-toggle__bars i:first-child { top: 0; }
.nav-toggle__bars i:last-child { bottom: 0; }

.site-header[data-open="true"] .nav-toggle__bars i:first-child {
  transform: translateY(5px) rotate(45deg);
}
.site-header[data-open="true"] .nav-toggle__bars i:last-child {
  transform: translateY(-5px) rotate(-45deg);
}

/* 遮罩 */
.nav-scrim {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  top: var(--header-h);
  z-index: 1;
  display: block;
  background: rgba(4, 12, 10, 0.62);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.3s var(--ease), visibility 0s linear 0.3s;
}

.site-header[data-open="true"] .nav-scrim {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition: opacity 0.3s var(--ease), visibility 0s;
}

/* ===================================================
   页脚
   =================================================== */
.site-footer {
  position: relative;
  margin-top: clamp(60px, 9vw, 120px);
  padding-top: clamp(38px, 5.5vw, 68px);
  background:
    linear-gradient(180deg, rgba(18, 42, 36, 0) 0%, rgba(18, 42, 36, 0.92) 26%),
    var(--c-ink-2);
  border-top: 1px solid var(--line-soft);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(46%, 520px);
  height: 2px;
  background: linear-gradient(90deg, var(--c-signal), rgba(61, 242, 182, 0));
}

.site-footer::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(30%, 300px);
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--line) 0 8px, transparent 8px 16px);
  transform: rotate(-0.9deg);
  transform-origin: 100% 0;
}

.footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: clamp(24px, 4vw, 52px);
}

.footer__brandline {
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-stretch: condensed;
  font-size: clamp(1.4rem, 2.4vw, 1.7rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--c-bone);
}

.footer__scene {
  margin-bottom: 12px;
  font-family: var(--font-serif);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--c-signal);
}

.footer__note {
  max-width: 36ch;
  font-size: 13px;
  line-height: 1.75;
  color: var(--c-mist);
}

.footer__title {
  margin-bottom: 14px;
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--c-mist);
}

.footer__list {
  display: grid;
  gap: 10px;
}

.footer__list a {
  color: rgba(233, 239, 234, 0.82);
  font-size: 15px;
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.footer__list a:hover { color: var(--c-signal); }

.footer__contact {
  margin-top: clamp(32px, 4.5vw, 56px);
  padding-top: 22px;
  border-top: 1px solid var(--line-soft);
  display: grid;
  gap: 7px;
}

.footer__contact-line {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.8;
  color: rgba(233, 239, 234, 0.8);
}

.footer__hours {
  font-size: 13px;
  line-height: 1.75;
  color: var(--c-mist);
}

.footer__legal {
  margin-top: 24px;
  padding: 18px 0 28px;
  border-top: 1px solid var(--line-soft);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 28px;
  font-size: 13px;
  color: var(--c-mist);
}

.footer__icp {
  font-family: var(--font-mono);
  color: var(--c-mist);
}

.footer__copy {
  margin-left: auto;
  color: var(--c-mist);
}

/* ===================================================
   响应式
   =================================================== */
@media (max-width: 1024px) {
  .col-3 { grid-column: span 4; }
  .col-4 { grid-column: span 6; }
  .col-5 { grid-column: span 6; }
  .col-7 { grid-column: span 12; }
  .col-8 { grid-column: span 12; }
  .col-9 { grid-column: span 12; }
}

@media (max-width: 900px) {
  :root {
    --header-h: 68px;
    --header-h-scrolled: 58px;
  }

  .nav__cta-mobile { display: inline-flex; }

  .site-nav {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    z-index: 2;
    margin-left: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: calc(var(--header-h) + 14px) var(--gutter) 28px;
    background: linear-gradient(180deg, #0B1D18 0%, #102420 100%);
    border-bottom: 1px solid var(--line);
    transform: translateY(-104%);
    visibility: hidden;
    transition: transform 0.34s var(--ease), visibility 0s linear 0.34s;
  }

  .site-header[data-open="true"] .site-nav {
    transform: translateY(0);
    visibility: visible;
    transition: transform 0.34s var(--ease), visibility 0s;
  }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav__link {
    display: block;
    padding: 15px 0;
    font-size: 17px;
    border-bottom: 1px solid var(--line-soft);
  }

  .nav__link::after,
  .nav__link:hover::after { display: none; }

  .nav__link[aria-current="page"] {
    color: var(--c-signal);
  }

  .nav__link[aria-current="page"]::before { display: none; }

  .nav__cta-mobile {
    margin-top: 22px;
    align-self: flex-start;
  }

  .header__cta { display: none; }

  .nav-toggle { display: inline-flex; }

  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }

  .footer__brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 640px) {
  body { font-size: 16px; }

  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9 {
    grid-column: span 12;
  }

  .grid { gap: 18px; }

  .brand__scene { display: none; }

  .footer__grid { grid-template-columns: 1fr; }

  .footer__copy { margin-left: 0; }

  .stat-strip__item { flex-basis: 210px; }
}

/* ===================================================
   减少动态效果
   =================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    transition-delay: 0ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .stat-strip__bar { transition: none; }

  .btn:hover { transform: none; }
}