/* ==========================================================================
   海博体育站 · /assets/site.css
   共享外壳：框架式竖导航 + 顶部节奏带 + 深色页脚 + 通用组件
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, ul, ol {
  margin: 0;
}

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

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

button {
  font: inherit;
  color: inherit;
}

/* ---------- 2. 设计变量 ---------- */
:root {
  /* 品牌色 */
  --ink: #081A2B;
  --ink-2: #0C2438;
  --ink-3: #05131E;
  --grass: #1E7A4F;
  --grass-deep: #14563A;
  --whistle: #F26B2A;
  --score: #F7F9F6;
  --teal: #2FAF9A;
  --amber: #FFB27A;
  --gold: #C9A227;
  --fog: #C7D0CB;
  --glass: #1B3A57;
  --ink-text: #10231C;

  /* 结构尺寸 */
  --rail-w: 240px;
  --band-h: 46px;
  --header-m-h: 92px;
  --shell-max: 1240px;
  --gutter: clamp(20px, 4vw, 56px);

  /* 线条 */
  --line: rgba(16, 35, 28, 0.13);
  --line-soft: rgba(16, 35, 28, 0.07);
  --line-invert: rgba(199, 208, 203, 0.16);

  /* 字体族 */
  --font-display: "Barlow Condensed", "Oswald", "Arial Narrow", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

/* ---------- 3. 基础排版 ---------- */
body {
  padding-left: var(--rail-w);
  padding-top: var(--band-h);
  background: var(--score);
  color: var(--ink-text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: 0.01em;
  color: var(--ink-text);
}

h1 { font-size: clamp(2.8rem, 6vw, 5.5rem); }
h2 { font-size: clamp(1.8rem, 3vw, 2.8rem); }
h3 { font-size: clamp(1.25rem, 1.8vw, 1.6rem); line-height: 1.28; }
h4 { font-size: 1.05rem; line-height: 1.4; letter-spacing: 0.04em; }

p { margin: 0; }

a { color: var(--grass-deep); text-underline-offset: 3px; }
a:hover { color: var(--grass); }

strong { font-weight: 700; }

code, kbd, samp {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

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

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

#main-content {
  scroll-margin-top: calc(var(--band-h) + 18px);
}

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 50%;
  z-index: 300;
  transform: translate(-50%, -180%);
  padding: 10px 20px;
  background: var(--whistle);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  border-radius: 3px;
  transition: transform 0.22s ease-out;
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translate(-50%, 0);
  outline: 2px solid var(--score);
  outline-offset: 2px;
}

/* ---------- 5. 头部外壳 ---------- */
.site-header {
  position: relative;
}

/* 5.1 左侧竖框 */
.header-rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 70;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  padding: 24px 18px 20px;
  background:
    linear-gradient(180deg, #0d2941 0%, #081a2b 54%, #05131e 100%);
  color: var(--score);
  border-right: 1px solid var(--line-invert);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
}

.header-rail::after {
  content: "";
  position: absolute;
  top: 0;
  right: 9px;
  bottom: 0;
  width: 1px;
  background-image: linear-gradient(
    to bottom,
    rgba(47, 175, 154, 0.38) 0 7px,
    transparent 7px 26px
  );
  background-size: 1px 26px;
  pointer-events: none;
  opacity: 0.55;
}

/* 5.2 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: inherit;
}

.brand:hover { color: inherit; }

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 40px;
  height: 40px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--score);
  background: linear-gradient(150deg, rgba(30, 122, 79, 0.92), rgba(20, 86, 58, 0.55));
  border: 1px solid rgba(199, 208, 203, 0.3);
  border-radius: 3px;
}

.brand__text { display: block; }

.brand__name {
  display: block;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 800;
  letter-spacing: 0.05em;
  line-height: 1.1;
  color: var(--score);
}

.brand__tag {
  display: block;
  margin-top: 3px;
  font-size: 11.5px;
  line-height: 1.3;
  letter-spacing: 0.06em;
  color: rgba(199, 208, 203, 0.72);
}

/* 5.3 导航 */
.primary-nav {
  margin-top: 30px;
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0;
  padding: 0;
}

.nav-item { display: block; }

.nav-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 8px 10px 13px;
  border-radius: 3px;
  color: rgba(247, 249, 246, 0.8);
  font-size: 15px;
  line-height: 1.4;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: color 0.2s ease-out, background-color 0.2s ease-out;
}

.nav-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: rgba(255, 178, 122, 0.68);
  transition: color 0.2s ease-out;
}

.nav-label { display: inline; }

.nav-link:hover,
.nav-link:focus-visible {
  color: #ffffff;
  background: rgba(47, 175, 154, 0.13);
}

.nav-link[aria-current="page"] {
  color: #ffffff;
  background: rgba(242, 107, 42, 0.14);
}

.nav-link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 3px;
  border-radius: 2px;
  background: var(--whistle);
}

.nav-link[aria-current="page"] .nav-num {
  color: var(--whistle);
}

/* 5.4 竖框底部刻度 */
.rail-foot {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--line-invert);
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.rail-foot__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(47, 175, 154, 0.9);
}

.rail-foot__note {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(199, 208, 203, 0.68);
}

/* 5.5 移动按钮（桌面隐藏） */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: rgba(27, 58, 87, 0.62);
  border: 1px solid rgba(199, 208, 203, 0.3);
  border-radius: 3px;
  color: var(--score);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: background-color 0.2s ease-out, border-color 0.2s ease-out;
}

.nav-toggle:hover {
  background: rgba(27, 58, 87, 0.95);
  border-color: rgba(199, 208, 203, 0.55);
}

.nav-toggle__bars {
  position: relative;
  display: inline-block;
  width: 16px;
  height: 2px;
  background: currentColor;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform 0.22s ease-out, opacity 0.22s ease-out;
}

.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

.site-header[data-open] .nav-toggle__bars { background: transparent; }
.site-header[data-open] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

/* 5.6 顶部节奏带 */
.header-band {
  position: fixed;
  top: 0;
  left: var(--rail-w);
  right: 0;
  z-index: 65;
  height: var(--band-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 0 24px;
  background: rgba(8, 26, 43, 0.94);
  border-bottom: 1px solid var(--line-invert);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  color: rgba(247, 249, 246, 0.82);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
}

.timeline {
  display: flex;
  align-items: center;
  gap: 22px;
  margin: 0;
  padding: 0;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.timeline::-webkit-scrollbar { display: none; }

.timeline li {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  white-space: nowrap;
  color: rgba(199, 208, 203, 0.84);
}

.timeline li::before {
  content: "";
  width: 5px;
  height: 5px;
  flex: none;
  background: currentColor;
  transform: rotate(45deg);
  opacity: 0.55;
}

.timeline li:first-child {
  color: var(--amber);
}

.timeline li:first-child::before {
  background: var(--whistle);
  opacity: 1;
}

.band-meta {
  display: flex;
  align-items: center;
  gap: 18px;
  flex: none;
}

.band-meta__item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  white-space: nowrap;
  color: rgba(199, 208, 203, 0.8);
}

.pulse {
  width: 6px;
  height: 6px;
  flex: none;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 3px rgba(47, 175, 154, 0.18);
}

.band-cta {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 14px;
  background: var(--whistle);
  color: #08131f;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.05em;
  border-radius: 2px;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 0.2s ease-out;
}

.band-cta::after {
  content: "→";
  font-family: var(--font-mono);
  font-size: 12px;
}

.band-cta:hover,
.band-cta:focus-visible {
  background: #ff8142;
  color: #08131f;
}

/* ---------- 6. 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, #071d2f 0%, #081a2b 50%, #050f17 100%);
  color: rgba(247, 249, 246, 0.86);
  font-size: 15px;
  line-height: 1.75;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(47, 175, 154, 0.09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(47, 175, 154, 0.07) 1px, transparent 1px);
  background-size: 118px 118px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), transparent 72%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), transparent 72%);
  pointer-events: none;
}

.footer-turf {
  position: relative;
  height: 6px;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(30, 122, 79, 0.9) 0 46px,
    rgba(20, 86, 58, 0.32) 46px 92px
  );
}

.footer-inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: clamp(44px, 6vw, 82px) var(--gutter) 26px;
}

.footer-main {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 2fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: start;
}

.footer-brand__mark {
  display: inline-block;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 2.6vw, 2.2rem);
  font-weight: 800;
  letter-spacing: 0.05em;
  line-height: 1.1;
  color: var(--score);
  text-decoration: none;
}

.footer-brand__mark:hover { color: var(--amber); }

.footer-brand__line {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--teal);
}

.footer-brand__text {
  margin-top: 14px;
  max-width: 34ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(199, 208, 203, 0.76);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 36px);
}

.footer-col__title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(199, 208, 203, 0.6);
  margin-bottom: 14px;
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 0;
  padding: 0;
}

.footer-contact li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(47, 175, 154, 0.85);
}

.footer-contact__value {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(247, 249, 246, 0.9);
  word-break: break-word;
}

.footer-contact li:nth-child(2) .footer-contact__value {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin: 0;
  padding: 0;
}

.footer-links a {
  position: relative;
  display: inline-block;
  padding-left: 13px;
  color: rgba(247, 249, 246, 0.82);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s ease-out, padding-left 0.2s ease-out;
}

.footer-links a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 1px;
  background: var(--grass);
  transition: width 0.2s ease-out, background-color 0.2s ease-out;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: #ffffff;
  padding-left: 17px;
}

.footer-links a:hover::before,
.footer-links a:focus-visible::before {
  width: 10px;
  background: var(--whistle);
}

.footer-service {
  margin-top: clamp(28px, 4vw, 44px);
  padding-top: 18px;
  border-top: 1px solid var(--line-invert);
  max-width: 78ch;
  font-size: 13px;
  line-height: 1.85;
  color: rgba(199, 208, 203, 0.62);
}

.footer-base {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.09em;
  color: rgba(199, 208, 203, 0.55);
}

.footer-copy,
.footer-icp { margin: 0; }

/* ---------- 7. 通用组件 ---------- */
.section {
  padding: clamp(44px, 6vw, 92px) var(--gutter);
}

.container {
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
}

.eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--grass);
}

.rule {
  height: 0;
  margin: 0;
  border: 0;
  border-top: 1px solid var(--line);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--grass-deep);
  background: rgba(47, 175, 154, 0.12);
  border: 1px solid rgba(47, 175, 154, 0.34);
  border-radius: 2px;
}

/* 7.1 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 26px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.2;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 3px;
  cursor: pointer;
  transition: background-color 0.2s ease-out, color 0.2s ease-out,
              border-color 0.2s ease-out;
}

.btn--primary {
  background: var(--grass);
  color: #ffffff;
}
.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--grass-deep);
  color: #ffffff;
}

.btn--accent {
  background: var(--whistle);
  color: #08131f;
}
.btn--accent:hover,
.btn--accent:focus-visible {
  background: #ff8142;
  color: #08131f;
}

.btn--ghost {
  background: transparent;
  color: var(--ink-text);
  border-color: rgba(16, 35, 28, 0.24);
}
.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--grass);
  color: var(--grass-deep);
}

.btn--on-dark {
  background: transparent;
  color: var(--score);
  border-color: rgba(199, 208, 203, 0.42);
}
.btn--on-dark:hover,
.btn--on-dark:focus-visible {
  border-color: var(--teal);
  color: var(--teal);
}

/* 7.2 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: #5b6b63;
}

.breadcrumb a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid rgba(16, 35, 28, 0.22);
  transition: color 0.2s ease-out, border-color 0.2s ease-out;
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--grass-deep);
  border-color: var(--grass);
}

.breadcrumb__sep {
  color: #a6b3ac;
  font-size: 11px;
}

/* 7.3 网格 */
.grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

.grid--split {
  grid-template-columns: minmax(0, 3fr) minmax(0, 7fr);
}

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

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

/* 7.4 图片容器基础 */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: 4px;
  background:
    linear-gradient(140deg, rgba(30, 122, 79, 0.2), rgba(8, 26, 43, 0.14) 60%, rgba(27, 58, 87, 0.24));
}

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

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(247, 249, 246, 0.08) 0 1px,
    transparent 1px 62px
  );
  pointer-events: none;
}

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--band { aspect-ratio: 21 / 9; }
.media-frame--portrait { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

/* ---------- 8. 滚动显现 ---------- */
.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 0.5s ease-out,
    transform 0.5s ease-out;
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}

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

/* ---------- 9. 响应式 ---------- */
@media (max-width: 1180px) {
  .footer-main {
    grid-template-columns: minmax(0, 1fr);
  }
  .footer-brand__text { max-width: 52ch; }
}

@media (max-width: 1080px) {
  :root { --rail-w: 206px; }
  .header-rail { padding: 20px 14px 18px; }
  .brand__tag { display: none; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 960px) {
  :root {
    --rail-w: 0px;
    --band-h: 0px;
  }

  html { scroll-behavior: auto; }

  body {
    padding-left: 0;
    padding-top: 0;
  }

  #main-content {
    padding-top: var(--header-m-h);
    scroll-margin-top: 16px;
  }

  /* 顶栏 */
  .header-rail {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: auto;
    width: auto;
    height: 56px;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    overflow: visible;
    border-right: 0;
    border-bottom: 1px solid var(--line-invert);
    background: linear-gradient(180deg, #0c2438 0%, #081a2b 100%);
  }

  .header-rail::after { display: none; }

  .brand { gap: 9px; }
  .brand__mark { width: 34px; height: 34px; font-size: 15px; }
  .brand__name { font-size: 18px; }
  .brand__tag { display: none; }

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

  .rail-foot { display: none; }

  /* 导航抽屉 */
  .primary-nav {
    position: fixed;
    top: var(--header-m-h);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 68;
    display: none;
    margin-top: 0;
    padding: 18px 16px 48px;
    overflow-y: auto;
    overscroll-behavior: contain;
    background: #081a2b;
    border-top: 1px solid var(--line-invert);
  }

  .site-header[data-open] .primary-nav { display: block; }

  .nav-list { gap: 4px; }

  .nav-link {
    padding: 14px 10px 14px 15px;
    font-size: 17px;
    border-bottom: 1px solid rgba(199, 208, 203, 0.1);
  }

  .nav-num { font-size: 12px; }

  body.nav-open { overflow: hidden; }

  /* 顶部节奏带改为第二行 */
  .header-band {
    top: 56px;
    left: 0;
    right: 0;
    height: 36px;
    padding: 0 16px;
    gap: 12px;
    font-size: 10.5px;
    letter-spacing: 0.06em;
  }

  .timeline { gap: 15px; }
  .timeline li { gap: 5px; }

  .band-meta { gap: 10px; }
  .band-meta__item { display: none; }

  .band-cta {
    padding: 5px 11px;
    font-size: 12px;
  }

  .section { padding: clamp(34px, 8vw, 56px) var(--gutter); }

  .grid--split,
  .grid--halves,
  .grid--thirds {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-inner { padding: 40px var(--gutter) 24px; }

  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
  }

  .footer-contact { flex-direction: column; }

  .footer-base {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

@media (max-width: 480px) {
  body { font-size: 16px; }
  .btn { padding: 12px 20px; font-size: 14px; }
  .band-cta { display: none; }
  .timeline { gap: 13px; }
  .footer-brand__line { font-size: 11px; letter-spacing: 0.1em; }
}

/* ---------- 10. 动效降级 ---------- */
@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;
    scroll-behavior: auto !important;
  }

  .js-reveal [data-reveal],
  .js-reveal [data-reveal].is-revealed {
    opacity: 1;
    transform: none;
    will-change: auto;
  }

  .nav-toggle__bars::before,
  .nav-toggle__bars::after {
    transition: none;
  }
}