/* ==========================================================================
   b体育登录 · 共享样式表 /assets/site.css
   设计语言：技术蓝图网格 + 赛场数据秩序
   ========================================================================== */

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

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

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, figcaption, 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;
  cursor: pointer;
}

a { color: inherit; text-decoration: none; }

main { display: block; }

/* ---------------------------------------------------------------
   2. Design tokens
   --------------------------------------------------------------- */
:root {
  /* 品牌色 */
  --deep: #0B3A2B;
  --deep-2: #062A20;
  --volt: #C6FF4A;
  --mint: #3FD68A;
  --orange: #FF7A29;
  --paper: #FFFFFF;
  --mist: #EFF4EE;
  --grey: #5E6E66;
  --line: #1E5B45;

  /* 文字 */
  --ink: #0E2A21;
  --ink-soft: #44584F;

  /* 字体栈 */
  --font-head: "Barlow Condensed", "Oswald", "Noto Sans SC", sans-serif;
  --font-body: "Inter", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --font-num: "Barlow Condensed", "Roboto Mono", ui-monospace, "SFMono-Regular", monospace;

  /* 度量 */
  --page: 1280px;
  --gutter: clamp(20px, 4vw, 64px);
  --r-card: 20px 5px 20px 5px;
  --r-btn: 14px 4px 14px 4px;
  --r-soft: 26px;

  /* 动效 */
  --ease: cubic-bezier(.22, .72, .26, 1);
  --dur: .24s;

  /* 网格线 */
  --grid-stroke: rgba(30, 91, 69, .45);
}

/* ---------------------------------------------------------------
   3. 基础排版
   --------------------------------------------------------------- */
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: .005em;
  color: inherit;
}

h1 { font-size: clamp(44px, 6vw, 84px); }
h2 { font-size: clamp(30px, 3.6vw, 48px); }
h3 { font-size: clamp(21px, 2.1vw, 28px); line-height: 1.2; }
h4 { font-size: 19px; line-height: 1.3; }

p { line-height: 1.75; }

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

::selection { background: var(--volt); color: var(--deep-2); }

:focus-visible {
  outline: 2px solid var(--volt);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(6, 42, 32, .55);
  border-radius: 3px;
}

#main-content { scroll-margin-top: 130px; }

/* ---------------------------------------------------------------
   4. 页头 —— 居中刊头 + 细线导航
   --------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  isolation: isolate;
  background: var(--deep);
  color: var(--paper);
  border-bottom: 1px solid var(--line);
  transition: box-shadow var(--dur) var(--ease);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(30, 91, 69, .55) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(0deg, rgba(30, 91, 69, .38) 0 1px, transparent 1px 64px);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
}

.site-header[data-scrolled="true"] {
  box-shadow: 0 22px 50px -34px rgba(0, 0, 0, .95);
}

/* 跳转链接 */
.skip-link {
  position: absolute;
  left: 50%;
  top: 0;
  z-index: 99;
  transform: translate(-50%, -140%);
  padding: 12px 24px;
  background: var(--volt);
  color: var(--deep-2);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: .08em;
  border-radius: 0 0 16px 16px;
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus { transform: translate(-50%, 0); }

/* 刊头行 */
.header-bar {
  max-width: var(--page);
  margin-inline: auto;
  padding: clamp(14px, 1.8vw, 22px) var(--gutter) 0;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  transition: padding var(--dur) var(--ease);
}

.header-kicker {
  justify-self: start;
  display: flex;
  align-items: center;
  gap: 9px;
  max-width: 24ch;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: rgba(198, 255, 74, .8);
}

.header-kicker::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  flex: none;
}

.masthead {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  min-width: 0;
}

.masthead-brand {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(27px, 3.2vw, 40px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--paper);
  transition: color var(--dur) var(--ease), font-size var(--dur) var(--ease);
}

.masthead-brand:hover { color: var(--volt); }

.masthead-tagline {
  margin-top: 4px;
  max-height: 22px;
  overflow: hidden;
  font-family: var(--font-num);
  font-size: 11.5px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .5);
  white-space: nowrap;
  transition: opacity var(--dur) var(--ease), max-height var(--dur) var(--ease);
}

.header-actions {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 15px;
  border: 1px solid rgba(198, 255, 74, .45);
  border-radius: var(--r-btn);
  color: var(--paper);
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: .14em;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.nav-toggle:hover { border-color: var(--volt); color: var(--volt); }

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 18px;
  height: 12px;
  flex: none;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--volt);
  transition: transform var(--dur) var(--ease);
}

.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { bottom: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { transform: translateY(-5px) rotate(-45deg); }

/* 导航 */
.site-nav {
  position: relative;
  max-width: var(--page);
  margin: clamp(10px, 1.4vw, 16px) auto 0;
  padding: 0 var(--gutter);
}

.site-nav::before {
  content: "";
  position: absolute;
  top: 0;
  left: var(--gutter);
  right: var(--gutter);
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(198, 255, 74, .3) 16%, rgba(198, 255, 74, .3) 84%, transparent);
}

.site-nav-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0 clamp(14px, 3vw, 44px);
}

.site-nav-list a {
  position: relative;
  display: block;
  padding: 14px 2px 15px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: .07em;
  color: rgba(255, 255, 255, .7);
  transition: color var(--dur) var(--ease);
}

.site-nav-list a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 8px;
  height: 2px;
  background: var(--volt);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform var(--dur) var(--ease);
}

.site-nav-list a:hover,
.site-nav-list a:focus-visible { color: var(--paper); }

.site-nav-list a:hover::after,
.site-nav-list a:focus-visible::after { transform: scaleX(1); }

.site-nav-list a[aria-current="page"] { color: var(--paper); }

.site-nav-list a[aria-current="page"]::after { transform: scaleX(1); }

/* 页头收缩态 */
.site-header[data-scrolled="true"] .header-bar { padding-top: 9px; }

.site-header[data-scrolled="true"] .masthead-brand { font-size: clamp(22px, 2.5vw, 31px); }

.site-header[data-scrolled="true"] .masthead-tagline { opacity: 0; max-height: 0; }

/* ---------------------------------------------------------------
   5. 页脚
   --------------------------------------------------------------- */
.site-footer {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--deep-2);
  color: rgba(255, 255, 255, .7);
  border-top: 1px solid var(--line);
}

.site-footer::before {
  content: "";
  position: absolute;
  z-index: -1;
  width: min(640px, 80vw);
  aspect-ratio: 1;
  right: -14%;
  top: -36%;
  border-radius: 46% 54% 62% 38% / 52% 44% 56% 48%;
  background: radial-gradient(circle at 42% 42%, rgba(63, 214, 138, .2), rgba(63, 214, 138, 0) 68%);
  pointer-events: none;
}

.site-footer::after {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(30, 91, 69, .55) 0 1px, transparent 1px 78px),
    repeating-linear-gradient(0deg, rgba(30, 91, 69, .4) 0 1px, transparent 1px 78px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .78), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .78), transparent 76%);
}

.footer-inner {
  position: relative;
  max-width: var(--page);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.15fr 1.15fr;
  gap: clamp(26px, 3vw, 46px);
  padding-block: clamp(48px, 6.5vw, 86px) clamp(30px, 4vw, 46px);
}

.footer-mark {
  display: inline-block;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 30px;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--paper);
  transition: color var(--dur) var(--ease);
}

.footer-mark:hover { color: var(--volt); }

.footer-line {
  margin-top: 14px;
  max-width: 34ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(255, 255, 255, .62);
}

.footer-meta {
  margin-top: 18px;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mint);
}

.footer-meta::before {
  content: "";
  width: 7px;
  height: 7px;
  flex: none;
  border-radius: 50%;
  background: var(--volt);
  box-shadow: 0 0 0 4px rgba(198, 255, 74, .16);
}

.footer-head {
  padding-bottom: 12px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--volt);
}

.footer-list li + li { margin-top: 10px; }

.footer-list a {
  display: inline-block;
  font-size: 15px;
  color: rgba(255, 255, 255, .74);
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.footer-list a:hover { color: var(--volt); padding-left: 6px; }

.footer-list-plain li {
  font-size: 14.5px;
  line-height: 1.65;
  color: rgba(255, 255, 255, .58);
  word-break: break-word;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 22px 0 32px;
  border-top: 1px solid var(--line);
  font-family: var(--font-num);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: rgba(255, 255, 255, .52);
}

.footer-legal-note { color: rgba(255, 255, 255, .42); }

/* ---------------------------------------------------------------
   6. 布局容器
   --------------------------------------------------------------- */
.wrap {
  width: 100%;
  max-width: var(--page);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(52px, 7vw, 104px); }
.section-tight { padding-block: clamp(34px, 4.5vw, 66px); }
.section-mist { background: var(--mist); }
.section-deep { background: var(--deep); color: var(--paper); }

.section-deep h1,
.section-deep h2,
.section-deep h3 { color: var(--paper); }

.section-deep .lead,
.band .lead { color: rgba(255, 255, 255, .78); }

.band-volt .lead { color: rgba(6, 42, 32, .8); }

.grid { display: grid; gap: clamp(18px, 2.4vw, 32px); }

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

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

.stack > * + * { margin-top: var(--gap, 16px); }

/* 横向主题带 */
.band {
  position: relative;
  overflow: hidden;
  padding-block: clamp(38px, 5vw, 70px);
  background: var(--deep);
  color: var(--paper);
}

.band h2, .band h3 { color: inherit; }

.band-volt { background: var(--volt); color: var(--deep-2); }
.band-orange { background: var(--orange); color: #2A1204; }

.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--line), rgba(30, 91, 69, 0));
}

/* ---------------------------------------------------------------
   7. 文字组件
   --------------------------------------------------------------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--grey);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  flex: none;
  background: currentColor;
  opacity: .75;
}

.eyebrow-volt { color: var(--volt); }
.eyebrow-mint { color: var(--mint); }

.lead {
  font-size: clamp(16.5px, 1.4vw, 18.5px);
  line-height: 1.72;
  color: var(--ink-soft);
}

.muted { color: var(--grey); font-size: 14px; }

.sec-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px 32px;
  margin-bottom: clamp(24px, 3vw, 42px);
}

.sec-title { font-size: clamp(30px, 3.6vw, 48px); }

.sec-note {
  max-width: 46ch;
  font-size: 15px;
  color: var(--grey);
}

.section-deep .sec-note,
.band .sec-note { color: rgba(255, 255, 255, .66); }

.band-volt .sec-note { color: rgba(6, 42, 32, .72); }

/* 面包屑 */
.crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-num);
  font-size: 12.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--grey);
}

.crumb a { color: var(--grey); transition: color var(--dur) var(--ease); }
.crumb a:hover { color: var(--deep); }
.crumb-sep { color: var(--line); }

/* ---------------------------------------------------------------
   8. 按钮
   --------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 22px;
  border: 1px solid transparent;
  border-radius: var(--r-btn);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: .06em;
  line-height: 1.2;
  white-space: nowrap;
  transition: transform .18s var(--ease), background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.btn-volt { background: var(--volt); color: var(--deep-2); }
.btn-volt:hover { background: #d9ff7d; transform: translateY(-2px); }

.btn-ghost { border-color: rgba(255, 255, 255, .42); color: var(--paper); }
.btn-ghost:hover { border-color: var(--volt); color: var(--volt); }

.btn-outline { border-color: var(--line); color: var(--deep); background: transparent; }
.btn-outline:hover { border-color: var(--deep); background: var(--mist); }

.btn-sm { padding: 9px 16px; font-size: 14px; letter-spacing: .08em; }

/* ---------------------------------------------------------------
   9. 卡片 / 面板 / 标签
   --------------------------------------------------------------- */
.card {
  padding: clamp(20px, 2.3vw, 30px);
  background: var(--paper);
  border: 1px solid rgba(30, 91, 69, .26);
  border-radius: var(--r-card);
  transition: transform .22s var(--ease), box-shadow .22s var(--ease), border-color .22s var(--ease);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--mint);
  box-shadow: 0 22px 46px -30px rgba(6, 42, 32, .95);
}

.card-dark {
  background: var(--deep);
  color: var(--paper);
  border-color: var(--line);
}

.card-dark:hover { border-color: var(--volt); }

.panel {
  padding: clamp(20px, 2.4vw, 32px);
  background: var(--paper);
  border: 1px solid rgba(30, 91, 69, .22);
  border-radius: var(--r-card);
}

.section-deep .panel,
.card-dark.panel { background: rgba(255, 255, 255, .04); border-color: var(--line); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 13px;
  border: 1px solid var(--mint);
  border-radius: 999px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--deep);
  background: rgba(63, 214, 138, .1);
}

.tag-orange {
  border-color: var(--orange);
  color: #A6410A;
  background: rgba(255, 122, 41, .12);
}

.section-deep .tag,
.card-dark .tag { color: var(--volt); border-color: rgba(198, 255, 74, .5); background: rgba(198, 255, 74, .1); }

/* 数据大数字 */
.stat { display: flex; flex-direction: column; gap: 7px; }

.stat-num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  font-size: clamp(40px, 5.4vw, 84px);
  line-height: .95;
  letter-spacing: -.01em;
  color: var(--deep);
}

.stat-num-volt { color: var(--volt); }
.stat-num-mint { color: var(--mint); }
.stat-num-orange { color: var(--orange); }

.stat-cap {
  font-family: var(--font-num);
  font-size: 12.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--grey);
}

.section-deep .stat-num,
.band .stat-num { color: var(--volt); }

.section-deep .stat-cap,
.band .stat-cap { color: rgba(255, 255, 255, .6); }

/* ---------------------------------------------------------------
   10. 图片容器（供页面阶段放置图片）
   --------------------------------------------------------------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: var(--r-card);
  background: var(--deep-2);
}

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

.media-ph {
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  min-height: 100%;
  padding: 22px;
  text-align: center;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .55);
  background-color: var(--deep-2);
  background-image:
    linear-gradient(140deg, rgba(63, 214, 138, .18), rgba(198, 255, 74, .06) 62%, transparent),
    repeating-linear-gradient(90deg, rgba(30, 91, 69, .6) 0 1px, transparent 1px 42px),
    repeating-linear-gradient(0deg, rgba(30, 91, 69, .45) 0 1px, transparent 1px 42px);
}

.media-16x9 { aspect-ratio: 16 / 9; }
.media-21x9 { aspect-ratio: 21 / 9; }
.media-4x3  { aspect-ratio: 4 / 3; }
.media-1x1  { aspect-ratio: 1 / 1; }
.media-3x4  { aspect-ratio: 3 / 4; }

@supports not (aspect-ratio: 1 / 1) {
  .media-ph { min-height: 220px; }
}

/* ---------------------------------------------------------------
   11. 表格 / 时间轴 / 分段控件
   --------------------------------------------------------------- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

.data-table caption {
  text-align: left;
  padding-bottom: 12px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--grey);
}

.data-table th {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--grey);
}

.data-table td {
  padding: 12px;
  border-bottom: 1px solid rgba(30, 91, 69, .18);
  font-size: 15px;
}

.data-table tbody tr:nth-child(even) { background: var(--mist); }

.section-deep .data-table th,
.card-dark .data-table th { color: rgba(255, 255, 255, .6); border-bottom-color: var(--line); }

.section-deep .data-table td,
.card-dark .data-table td { border-bottom-color: rgba(30, 91, 69, .7); }

.section-deep .data-table tbody tr:nth-child(even),
.card-dark .data-table tbody tr:nth-child(even) { background: rgba(255, 255, 255, .04); }

/* 水平赛季刻度轴 */
.timeline {
  display: flex;
  gap: 0;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
}

.timeline-step {
  position: relative;
  flex: 1 0 clamp(170px, 22vw, 240px);
  padding: 30px 22px 0 0;
  border-top: 1px solid var(--line);
}

.timeline-step::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--volt);
  box-shadow: 0 0 0 5px rgba(198, 255, 74, .16);
}

.timeline-year {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 20px;
  color: var(--deep);
}

.timeline-note {
  margin-top: 6px;
  font-size: 14px;
  color: var(--grey);
}

.section-deep .timeline-year { color: var(--volt); }
.section-deep .timeline-note { color: rgba(255, 255, 255, .62); }

/* 可访问分段控件 */
.segmented { display: block; }

.segmented-rail {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 5px;
  background: var(--mist);
  border: 1px solid rgba(30, 91, 69, .26);
  border-radius: var(--r-btn);
}

.segmented-btn {
  padding: 9px 18px;
  border-radius: 11px 3px 11px 3px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 16px;
  letter-spacing: .06em;
  color: var(--grey);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.segmented-btn:hover { color: var(--deep); }

.segmented-btn[aria-selected="true"] {
  background: var(--deep);
  color: var(--volt);
}

.segmented-panels { margin-top: clamp(18px, 2.4vw, 30px); }

.segmented-panel[hidden] { display: none; }

.section-deep .segmented-rail,
.band .segmented-rail {
  background: rgba(255, 255, 255, .06);
  border-color: var(--line);
}

.section-deep .segmented-btn,
.band .segmented-btn { color: rgba(255, 255, 255, .68); }

.section-deep .segmented-btn[aria-selected="true"],
.band .segmented-btn[aria-selected="true"] { background: var(--volt); color: var(--deep-2); }

/* ---------------------------------------------------------------
   12. 滚动进度刻度
   --------------------------------------------------------------- */
.scroll-meter {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
  height: 3px;
  pointer-events: none;
  background: rgba(11, 58, 43, .14);
}

.scroll-meter-bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--mint), var(--volt));
}

/* ---------------------------------------------------------------
   13. 显现动效
   --------------------------------------------------------------- */
html[data-anim="on"] [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}

html[data-anim="on"] [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------------------------------------------------------------
   14. 响应式
   --------------------------------------------------------------- */
@media (max-width: 1023px) {
  .grid-12 > .g-span-3,
  .grid-12 > .g-span-4,
  .grid-12 > .g-span-5 { grid-column: span 6; }

  .grid-12 > .g-span-7,
  .grid-12 > .g-span-8 { grid-column: span 12; }

  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 34px 28px;
  }

  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 899px) {
  .header-bar {
    grid-template-columns: 1fr auto;
    grid-template-areas: "masthead actions";
    align-items: center;
    padding-top: 14px;
    gap: 12px;
  }

  .header-kicker { display: none; }

  .masthead {
    grid-area: masthead;
    align-items: flex-start;
    text-align: left;
  }

  .masthead-tagline { display: none; }

  .header-actions { grid-area: actions; }

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

  .site-nav {
    overflow: hidden;
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    transition: max-height .32s var(--ease), opacity .2s var(--ease), margin-top .32s var(--ease), border-color .2s var(--ease);
    border-top: 1px solid transparent;
  }

  .site-nav::before { display: none; }

  .site-nav[data-open="true"] {
    max-height: 560px;
    opacity: 1;
    margin-top: 12px;
    border-top-color: rgba(198, 255, 74, .22);
  }

  .site-nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 0 18px;
  }

  .site-nav-list a {
    padding: 15px 6px;
    font-size: 19px;
    border-bottom: 1px solid rgba(30, 91, 69, .8);
  }

  .site-nav-list a::after { display: none; }

  .site-nav-list a[aria-current="page"] {
    color: var(--volt);
    background: linear-gradient(90deg, rgba(198, 255, 74, .14), rgba(198, 255, 74, 0) 74%);
  }

  #main-content { scroll-margin-top: 96px; }
}

@media (max-width: 639px) {
  .grid-12 > .g-span-3,
  .grid-12 > .g-span-4,
  .grid-12 > .g-span-5,
  .grid-12 > .g-span-6 { grid-column: 1 / -1; }

  .footer-grid { grid-template-columns: 1fr; gap: 30px; }

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

  .header-bar .btn-sm { padding: 8px 12px; font-size: 12.5px; letter-spacing: .04em; }

  .stat-num { font-size: clamp(36px, 12vw, 60px); }
}

/* ---------------------------------------------------------------
   15. 无障碍与动效降级
   --------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  .card:hover,
  .btn-volt:hover { transform: none; }

  .footer-list a:hover { padding-left: 0; }
}