/* =========================================================
   易倍体育主站 — 共享样式表 /assets/site.css
   深空黑 + 荧光绿赛场科技体系
   ========================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 104px;
  scrollbar-color: #28313B #06080A;
  scrollbar-width: thin;
}
html::-webkit-scrollbar { width: 12px; height: 12px; }
html::-webkit-scrollbar-track { background: #06080A; }
html::-webkit-scrollbar-thumb {
  background: #28313B;
  border-radius: 999px;
  border: 3px solid #06080A;
}

body {
  margin: 0;
  background-color: #06080A;
  background-image:
    radial-gradient(1100px 620px at 12% -8%, rgba(63, 200, 255, 0.10), transparent 62%),
    radial-gradient(900px 520px at 96% 4%, rgba(182, 255, 61, 0.07), transparent 60%),
    repeating-linear-gradient(0deg, rgba(241, 245, 243, 0.022) 0 1px, transparent 1px 3px);
  background-attachment: fixed;
  color: #F1F5F3;
  font-family: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; }

::selection { background: #B6FF3D; color: #06080A; }

/* ---------- 2. 变量 ---------- */
:root {
  /* 色板 */
  --space-black: #06080A;
  --graphite: #10141A;
  --steel: #28313B;
  --volt: #B6FF3D;
  --signal: #3FC8FF;
  --alert: #FF6A2C;
  --frost: #F1F5F3;
  --mist: #93A1AD;
  --moss: #16240F;
  --day-sheet: #EAF0EC;

  /* 字体 */
  --font-display: "Archivo Narrow", "Oswald", "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-data: "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;

  /* 字阶 14 / 18 / 22 / 28 / 36 / 45 / 56 / 70 */
  --fs-14: 14px;
  --fs-18: 18px;
  --fs-22: 22px;
  --fs-28: 28px;
  --fs-36: 36px;
  --fs-45: 45px;
  --fs-56: 56px;
  --fs-70: 70px;

  /* 形状 */
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 28px;
  --radius-pill: 999px;

  /* 间距 */
  --gap-block: clamp(64px, 10vw, 140px);
  --gap-tight: clamp(16px, 2vw, 28px);
  --wrap-max: 1280px;

  /* 动效 */
  --ease-spring: cubic-bezier(.2, .8, .2, 1);
  --dur-fast: 180ms;
  --dur-mid: 240ms;

  /* 头部 */
  --header-compact: 56px;
}

/* ---------- 3. 中文排版基础 ---------- */
.prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.75;
  color: #DDE4E0;
}
.prose p + p { margin-top: 1.1em; }
.prose h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--frost);
  margin: 1.8em 0 0.6em;
}
.prose h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--frost);
  margin: 1.5em 0 0.4em;
}
.prose ul { margin: 1em 0; }
.prose li {
  position: relative;
  padding-left: 20px;
  margin: 0.5em 0;
}
.prose li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--volt);
}
.prose strong { color: var(--frost); font-weight: 700; }
.prose a {
  color: var(--signal);
  border-bottom: 1px solid rgba(63, 200, 255, 0.4);
  transition: border-color var(--dur-fast) linear;
}
.prose a:hover { border-bottom-color: var(--signal); }

.prose--day {
  background: var(--day-sheet);
  color: #10141A;
  max-width: 78ch;
  border-radius: var(--radius-lg);
  padding: clamp(24px, 4vw, 56px);
}
.prose--day h2,
.prose--day h3,
.prose--day strong { color: #06080A; }
.prose--day a { color: #0B6E9B; border-bottom-color: rgba(11, 110, 155, 0.45); }
.prose--day li::before { background: #16240F; }

/* ---------- 4. 布局 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap-max);
  margin-inline: auto;
  padding-inline: clamp(18px, 4vw, 44px);
}

.stack > * + * { margin-top: var(--gap-tight); }
.stack--loose > * + * { margin-top: clamp(32px, 5vw, 72px); }

.grid12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap-tight);
}
.col-3 { grid-column: span 3; min-width: 0; }
.col-4 { grid-column: span 4; min-width: 0; }
.col-5 { grid-column: span 5; min-width: 0; }
.col-7 { grid-column: span 7; min-width: 0; }
.col-8 { grid-column: span 8; min-width: 0; }
.col-9 { grid-column: span 9; min-width: 0; }
.col-12 { grid-column: span 12; min-width: 0; }

.split-7-5,
.split-8-4,
.split-3-9 {
  display: grid;
  gap: clamp(20px, 3.4vw, 52px);
  align-items: start;
}
.split-7-5 { grid-template-columns: 7fr 5fr; }
.split-8-4 { grid-template-columns: 8fr 4fr; }
.split-3-9 { grid-template-columns: 3fr 9fr; }

.divider {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--steel), rgba(40, 49, 59, 0.15) 55%, transparent);
  margin: clamp(40px, 6vw, 88px) 0;
}

/* ---------- 5. 文字与数据组件 ---------- */
.display {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 7vw, 112px);
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: var(--frost);
  margin: 0;
}
.display--volt { color: var(--volt); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--volt);
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--volt);
  flex: none;
}

.lede {
  font-size: clamp(17px, 1.5vw, 19px);
  line-height: 1.75;
  color: #C7D0CC;
  max-width: 62ch;
}

.data-num {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.meta-line {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.stat { display: flex; flex-direction: column; gap: 2px; }
.stat__value {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(24px, 3vw, 36px);
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--frost);
}
.stat__value--volt { color: var(--volt); }
.stat__value--alert { color: var(--alert); }
.stat__label {
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--mist);
  text-transform: uppercase;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(182, 255, 61, 0.3);
  background: var(--moss);
  color: var(--volt);
  font-family: var(--font-data);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  white-space: nowrap;
}
.tag--blue {
  background: rgba(63, 200, 255, 0.12);
  color: var(--signal);
  border-color: rgba(63, 200, 255, 0.32);
}
.tag--alert {
  background: rgba(255, 106, 44, 0.14);
  color: var(--alert);
  border-color: rgba(255, 106, 44, 0.36);
}

/* ---------- 6. 区块与卡片 ---------- */
.panel {
  background: var(--graphite);
  border: 1px solid var(--steel);
  border-radius: var(--radius-lg);
  padding: clamp(20px, 3vw, 36px);
}
.panel--volt {
  background: var(--moss);
  border-color: rgba(182, 255, 61, 0.28);
}
.panel--day {
  background: var(--day-sheet);
  border-color: transparent;
  color: #06080A;
}
.panel--day .stat__value,
.panel--day .stat__label { color: #06080A; }

.card {
  background: var(--graphite);
  border: 1px solid var(--steel);
  border-radius: var(--radius-md);
  padding: 16px;
  position: relative;
  overflow: hidden;
  transition: border-color var(--dur-mid) var(--ease-spring), transform var(--dur-mid) var(--ease-spring);
}
.card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: transparent;
  transition: background var(--dur-mid) linear, width var(--dur-mid) var(--ease-spring);
}
.card:hover {
  border-color: #38424E;
  transform: translateY(-2px);
}
.card:hover::before { background: var(--volt); width: 6px; }
.card--alert::before { background: var(--alert); width: 4px; }

.aside-note {
  border-left: 2px solid var(--signal);
  padding-left: 14px;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.65;
}
.aside-note strong { color: var(--frost); font-weight: 700; }

/* ---------- 7. 数据条 ---------- */
.data-bar {
  position: relative;
  display: block;
  height: 8px;
  border-radius: var(--radius-pill);
  background: #0B0F14;
  border: 1px solid var(--steel);
  overflow: hidden;
}
.data-bar__fill {
  display: block;
  height: 100%;
  width: 0;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--signal), var(--volt));
  transition: width 700ms var(--ease-spring);
}
.data-bar--alert .data-bar__fill {
  background: linear-gradient(90deg, #FF9A5E, var(--alert));
}

/* ---------- 8. 按钮与胶囊 ---------- */
.btn {
  --btn-bg: var(--graphite);
  --btn-fg: var(--frost);
  --btn-bd: var(--steel);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--btn-bd);
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.2;
  cursor: pointer;
  white-space: nowrap;
  transition: transform var(--dur-mid) var(--ease-spring),
              background-color var(--dur-fast) linear,
              border-color var(--dur-fast) linear,
              color var(--dur-fast) linear;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--volt {
  --btn-bg: var(--volt);
  --btn-fg: var(--space-black);
  --btn-bd: var(--volt);
}
.btn--volt:hover {
  --btn-bg: #C9FF6B;
  --btn-bd: #C9FF6B;
}
.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--frost);
  --btn-bd: var(--steel);
}
.btn--ghost:hover {
  --btn-bd: var(--signal);
  --btn-fg: var(--signal);
  --btn-bg: rgba(63, 200, 255, 0.06);
}
.btn--sm { padding: 8px 15px; font-size: 13.5px; }

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 15px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--steel);
  background: var(--graphite);
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.2;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color var(--dur-mid) var(--ease-spring),
              color var(--dur-fast) linear,
              border-color var(--dur-fast) linear,
              transform var(--dur-mid) var(--ease-spring);
}
.pill:hover {
  color: var(--frost);
  border-color: var(--signal);
  transform: translateY(-1px);
}
.pill[aria-current="true"],
.pill[aria-selected="true"] {
  background: var(--volt);
  border-color: var(--volt);
  color: var(--space-black);
}

/* ---------- 9. 标签页与折叠 ---------- */
.tabs__list {
  display: flex;
  gap: 6px;
  padding: 5px;
  border: 1px solid var(--steel);
  border-radius: var(--radius-pill);
  background: var(--graphite);
  overflow-x: auto;
  scrollbar-width: none;
}
.tabs__list::-webkit-scrollbar { display: none; }
[role="tabpanel"][hidden] { display: none; }
[role="tabpanel"] { padding-top: clamp(20px, 3vw, 32px); }

/* ---------- 10. 面包屑 ---------- */
.breadcrumb { padding-block: 18px 0; }
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}
.breadcrumb__list li { display: inline-flex; align-items: center; gap: 6px; }
.breadcrumb__list li + li::before {
  content: "/";
  color: var(--steel);
}
.breadcrumb__list a { color: var(--mist); transition: color var(--dur-fast) linear; }
.breadcrumb__list a:hover { color: var(--signal); }
.breadcrumb__list [aria-current="page"] { color: var(--frost); }

/* ---------- 11. 图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--steel);
  background:
    linear-gradient(150deg, #0E1419 0%, #06080A 68%);
}
.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(-45deg, rgba(63, 200, 255, 0.07) 0 2px, transparent 2px 10px);
  pointer-events: none;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(6, 8, 10, 0.72) 100%);
  pointer-events: none;
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.7) contrast(1.06) brightness(0.92);
}
.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }

/* ---------- 12. 显现动效 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms var(--ease-spring), transform 420ms var(--ease-spring);
}
.reveal.is-in { opacity: 1; transform: none; }

/* ---------- 13. 焦点 ---------- */
:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
  border-radius: 6px;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -80px;
  z-index: 200;
  padding: 12px 20px;
  border-radius: var(--radius-pill);
  background: var(--volt);
  color: var(--space-black);
  font-weight: 700;
  font-size: 14px;
  transition: top var(--dur-mid) var(--ease-spring);
}
.skip-link:focus {
  top: 12px;
}

/* =========================================================
   14. 头部
   ========================================================= */
.masthead {
  position: sticky;
  top: 0;
  z-index: 80;
  background: linear-gradient(180deg, rgba(6, 8, 10, 0.97), rgba(6, 8, 10, 0.9));
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--steel);
  color: var(--frost);
}

.masthead__inner {
  position: relative;
}

/* 上层：品牌署名 + 全局动作 */
.masthead__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-block: 9px;
  border-bottom: 1px solid var(--steel);
  max-height: 96px;
  overflow: hidden;
  transition: max-height var(--dur-mid) var(--ease-spring),
              opacity var(--dur-fast) linear,
              padding var(--dur-mid) var(--ease-spring),
              border-color var(--dur-mid) linear;
}
.masthead.is-condensed .masthead__top {
  max-height: 0;
  opacity: 0;
  padding-block: 0;
  border-bottom-color: transparent;
}

.masthead__brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}
.masthead__mark {
  flex: none;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: var(--volt);
  color: var(--space-black);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -0.02em;
}
.masthead__brandtext {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
  min-width: 0;
}
.masthead__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--frost);
}
.masthead__tagline {
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
  white-space: nowrap;
}

.masthead__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: none;
}

/* 主行：栏目 + 移动开关 */
.masthead__main {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 52px;
}

.masthead__toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 15px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--steel);
  background: var(--graphite);
  color: var(--frost);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: border-color var(--dur-fast) linear, color var(--dur-fast) linear;
}
.masthead__toggle:hover { border-color: var(--volt); color: var(--volt); }
.masthead__toggle-bars {
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  box-shadow: 0 -5px 0 currentColor, 0 5px 0 currentColor;
}
.masthead[data-open] .masthead__toggle {
  border-color: var(--volt);
  color: var(--volt);
}

/* 主导航 */
.nav-primary { min-width: 0; }
.nav-primary__list {
  display: flex;
  align-items: center;
  gap: clamp(4px, 1.6vw, 26px);
}
.nav-primary__link {
  position: relative;
  display: inline-block;
  padding: 9px 4px;
  color: #D6DEDA;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: color var(--dur-fast) linear;
}
.nav-primary__link::after {
  content: "";
  position: absolute;
  left: 4px;
  right: 4px;
  bottom: 3px;
  height: 2px;
  border-radius: 2px;
  background: var(--volt);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur-mid) var(--ease-spring);
}
.nav-primary__link:hover { color: var(--frost); }
.nav-primary__link:hover::after { transform: scaleX(1); }
.nav-primary__link[aria-current="page"] { color: var(--volt); }
.nav-primary__link[aria-current="page"]::after { transform: scaleX(1); }

/* 索引带 */
.index-strip {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-block: 7px;
  border-top: 1px solid var(--steel);
  max-height: 62px;
  overflow: hidden;
  transition: max-height var(--dur-mid) var(--ease-spring),
              opacity var(--dur-fast) linear,
              padding var(--dur-mid) var(--ease-spring),
              border-color var(--dur-mid) linear;
}
.masthead.is-condensed .index-strip {
  max-height: 0;
  opacity: 0;
  padding-block: 0;
  border-top-color: transparent;
  pointer-events: none;
}
.index-strip[hidden] { display: none; }

.index-strip__label {
  flex: none;
  font-family: var(--font-data);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}
.index-strip__list {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  padding-block: 2px;
  scrollbar-width: none;
  scroll-snap-type: x proximity;
}
.index-strip__list::-webkit-scrollbar { display: none; }
.index-strip__item { flex: none; scroll-snap-align: start; }

/* =========================================================
   15. 页脚
   ========================================================= */
.site-foot {
  position: relative;
  margin-top: clamp(72px, 11vw, 150px);
  background: var(--graphite);
  border-top: 1px solid var(--steel);
  color: var(--frost);
}
.site-foot::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(320px, 40%);
  height: 2px;
  background: linear-gradient(90deg, var(--volt), rgba(182, 255, 61, 0));
}

.site-foot__grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1.5fr;
  gap: clamp(28px, 4vw, 60px);
  padding-block: clamp(44px, 6vw, 80px);
}

.site-foot__brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 2.4vw, 28px);
  letter-spacing: -0.015em;
  color: var(--frost);
  line-height: 1.1;
}
.site-foot__lede {
  margin-top: 12px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
  max-width: 34ch;
}
.site-foot__tick {
  margin-top: 16px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--volt);
}

.site-foot__title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
  margin-bottom: 14px;
}
.site-foot__list { display: flex; flex-direction: column; gap: 10px; }
.site-foot__link {
  display: inline-block;
  font-size: 14.5px;
  color: #C7D0CC;
  transition: color var(--dur-fast) linear, transform var(--dur-mid) var(--ease-spring);
}
.site-foot__link:hover { color: var(--volt); transform: translateX(3px); }

.site-foot__contact { display: flex; flex-direction: column; gap: 14px; }
.site-foot__contact-item { display: flex; flex-direction: column; gap: 3px; }
.site-foot__key {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
  text-transform: uppercase;
}
.site-foot__val {
  font-family: var(--font-data);
  font-size: 13.5px;
  letter-spacing: 0.01em;
  color: var(--frost);
  word-break: break-word;
  line-height: 1.55;
}

.site-foot__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  padding-block: 20px 28px;
  border-top: 1px solid var(--steel);
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--mist);
}
.site-foot__icp { color: var(--mist); }
.site-foot__legal-list { display: flex; flex-wrap: wrap; gap: 18px; }
.site-foot__copy { margin-left: auto; color: var(--mist); }

/* =========================================================
   16. 回顶按钮（JS 注入）
   ========================================================= */
.to-top {
  position: fixed;
  right: clamp(16px, 3vw, 34px);
  bottom: clamp(16px, 3vw, 34px);
  z-index: 70;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border: 1px solid var(--volt);
  border-radius: 50%;
  background: var(--volt);
  color: var(--space-black);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--dur-mid) var(--ease-spring),
              transform var(--dur-mid) var(--ease-spring),
              visibility var(--dur-mid) linear,
              background-color var(--dur-fast) linear;
}
.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.to-top:hover { background: #C9FF6B; }

/* =========================================================
   17. 响应式
   ========================================================= */
@media (max-width: 1080px) {
  .site-foot__grid { grid-template-columns: 1.6fr 1fr 1.6fr; }
  .site-foot__col--brand { grid-column: 1 / -1; }
  .site-foot__lede { max-width: 52ch; }
}

@media (max-width: 960px) {
  .split-7-5,
  .split-8-4,
  .split-3-9 { grid-template-columns: 1fr; }
  .col-3, .col-4, .col-5, .col-7, .col-8, .col-9 { grid-column: span 12; }
}

@media (max-width: 860px) {
  html { scroll-padding-top: 76px; }

  .masthead__toggle { display: inline-flex; }

  .masthead__main {
    justify-content: space-between;
    min-height: 52px;
  }

  .nav-primary {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: block;
    background: var(--space-black);
    border-bottom: 1px solid var(--steel);
    box-shadow: 0 26px 48px rgba(0, 0, 0, 0.6);
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    transition: max-height 320ms var(--ease-spring), visibility 320ms linear;
  }
  .masthead[data-open] .nav-primary {
    max-height: min(74vh, 560px);
    overflow-y: auto;
    visibility: visible;
  }

  .nav-primary__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px clamp(18px, 4vw, 44px) 20px;
  }
  .nav-primary__link {
    display: block;
    padding: 15px 8px;
    font-size: 17px;
    border-bottom: 1px solid var(--steel);
  }
  .nav-primary__link::after { display: none; }
  .nav-primary__link[aria-current="page"] {
    color: var(--volt);
    background: var(--graphite);
  }

  .masthead__top { flex-wrap: wrap; gap: 10px; }
  .masthead__tagline { display: none; }
  .masthead__actions { gap: 8px; }

  .index-strip { gap: 10px; }
  .index-strip__label { display: none; }

  .site-foot__grid { grid-template-columns: 1fr 1fr; gap: 32px 24px; }
  .site-foot__col--brand { grid-column: 1 / -1; }
  .site-foot__copy { margin-left: 0; width: 100%; }
}

@media (max-width: 560px) {
  .masthead__actions .btn--ghost { display: none; }
  .masthead__mark { width: 34px; height: 34px; font-size: 17px; }
  .masthead__name { font-size: 16px; }
  .site-foot__grid { grid-template-columns: 1fr; }
  .btn { padding: 11px 18px; font-size: 14.5px; }
  .btn--sm { padding: 8px 14px; font-size: 13px; }
}

/* =========================================================
   18. 减少动效
   ========================================================= */
@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;
  }

  .reveal { opacity: 1; transform: none; }
  .btn:hover,
  .pill:hover,
  .card:hover,
  .site-foot__link:hover { transform: none; }
  .data-bar__fill { transition: none; }
}