/* =========================================================
   MANBETX体育 · 共享样式表 /assets/site.css
   夜间赛场基调 + 左侧品牌轨道 + 切角面板 + 等宽数字
   ========================================================= */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, figcaption, blockquote, dl, dt, dd { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }

/* ---------- 2. Tokens ---------- */
:root {
  --c-void: #07090C;
  --c-panel: #111821;
  --c-line: #232D38;
  --c-muted: #7C8896;
  --c-ink: #F4F7F9;
  --c-neon: #C8FF3C;
  --c-orange: #FF7A1A;
  --c-cyan: #35E0C0;
  --c-moss: #0E1A10;
  --c-lift: #1A2430;
  --c-deep: #0B1119;

  --rail-w: 88px;
  --railbar-h: 0px;
  --status-h: 32px;
  --mast-h: 76px;
  --shell-h: calc(var(--railbar-h) + var(--status-h) + var(--mast-h));

  --pad-x: clamp(18px, 4vw, 56px);
  --maxw: 1240px;
  --cut: 18px;
  --ease: cubic-bezier(.22, .61, .36, 1);

  --font-sans: "Inter", "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "IBM Plex Mono", "Roboto Mono", Menlo, Consolas, monospace;
}

/* ---------- 3. Base & 中文排版 ---------- */
html { scroll-behavior: smooth; }
body {
  min-height: 100vh;
  background: var(--c-void);
  color: var(--c-ink);
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  padding-left: var(--rail-w);
  padding-top: var(--shell-h);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { font-weight: 900; line-height: 1.12; letter-spacing: -.01em; }
h1 { font-size: clamp(34px, 5.4vw, 62px); }
h2 { font-size: clamp(26px, 3.4vw, 42px); }
h3 { font-size: clamp(19px, 1.7vw, 24px); line-height: 1.35; }
h4 { font-size: 17px; line-height: 1.4; }
p { max-width: 68ch; }
p + p { margin-top: 1.2em; }
strong { font-weight: 700; }
::selection { background: var(--c-neon); color: #07090C; }
[id] { scroll-margin-top: calc(var(--shell-h) + 20px); }

/* ---------- 4. 可达性 ---------- */
.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;
}
:focus-visible { outline: 2px solid var(--c-neon); outline-offset: 3px; }
.skip-link {
  position: fixed;
  top: 8px;
  left: calc(var(--rail-w) + 12px);
  z-index: 200;
  transform: translateY(-180%);
  background: var(--c-neon);
  color: #07090C;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  padding: 10px 18px;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: transform .16s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 5. 骨架：容器 / 网格 / 章节 ---------- */
.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--pad-x); }
.container--wide { max-width: 1500px; }

.grid { display: grid; gap: clamp(16px, 2vw, 28px); grid-template-columns: repeat(12, minmax(0, 1fr)); }
.span-4 { grid-column: span 4; }
.span-6 { grid-column: span 6; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

.section { padding-block: clamp(40px, 6vw, 84px); }
.section--tight { padding-block: clamp(22px, 3vw, 44px); }
.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 16px;
  margin-bottom: clamp(20px, 3vw, 36px);
  border-bottom: 1px solid var(--c-line);
}

.chapter {
  display: grid;
  grid-template-columns: minmax(58px, auto) minmax(0, 1fr);
  gap: clamp(14px, 2vw, 30px);
  align-items: start;
}
.chapter__index {
  font-family: var(--font-mono);
  font-weight: 200;
  font-size: clamp(52px, 8vw, 132px);
  line-height: .82;
  letter-spacing: -.05em;
  color: rgba(124, 136, 150, .14);
  -webkit-text-stroke: 1px var(--c-line);
}
.chapter__body { max-width: 74ch; }
.chapter__eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--c-muted);
  text-transform: uppercase;
  margin-bottom: 8px;
}
.chapter__title { margin-bottom: 10px; }
.chapter__lead { color: var(--c-muted); max-width: 62ch; }

/* ---------- 6. 面板 / 标签 / 数据 ---------- */
.panel {
  position: relative;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  padding: clamp(18px, 2.2vw, 30px);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
  transition: background-color .16s var(--ease), border-color .16s var(--ease), transform .16s var(--ease);
}
.panel:hover { background: var(--c-lift); border-color: var(--c-neon); transform: translateY(-2px); }
.panel:focus-within { border-color: var(--c-neon); }
.panel--data { background: linear-gradient(160deg, #111821 0%, var(--c-deep) 100%); }
.panel--data::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(180deg, rgba(255, 255, 255, .035) 0 1px, rgba(0, 0, 0, 0) 1px 6px);
  opacity: .55;
}
.panel--accent { border-color: rgba(200, 255, 60, .45); }
.panel--moss { background: var(--c-moss); }
.panel__title {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--c-muted);
  margin-bottom: 12px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  padding: 4px 9px;
  border: 1px solid var(--c-line);
  color: var(--c-muted);
}
.tag--neon { color: var(--c-neon); border-color: rgba(200, 255, 60, .45); }
.tag--orange { color: var(--c-orange); border-color: rgba(255, 122, 26, .45); }
.tag--cyan { color: var(--c-cyan); border-color: rgba(53, 224, 192, .45); }

.stat { display: flex; flex-direction: column; gap: 4px; }
.stat__value {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(30px, 4.5vw, 56px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--c-neon);
}
.stat__unit { font-size: .42em; letter-spacing: .06em; color: var(--c-muted); margin-left: 5px; }
.stat__label { font-size: 13px; letter-spacing: .12em; color: var(--c-muted); }
.stat--orange .stat__value { color: var(--c-orange); }
.stat--cyan .stat__value { color: var(--c-cyan); }
.stat--ink .stat__value { color: var(--c-ink); }

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--c-ink);
  background: transparent;
  border: 1px solid var(--c-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: background-color .16s var(--ease), color .16s var(--ease), border-color .16s var(--ease);
}
.btn:hover { color: var(--c-neon); border-color: var(--c-neon); }
.btn:focus-visible { outline: none; box-shadow: inset 0 0 0 2px var(--c-neon); }
.btn--cta { background: var(--c-neon); border-color: var(--c-neon); color: #07090C; }
.btn--cta:hover { background: #DDFF7E; border-color: #DDFF7E; color: #07090C; }
.btn--cta:focus-visible { box-shadow: inset 0 0 0 2px #07090C; }
.btn--ghost { color: var(--c-muted); }
.btn--ghost:hover { color: var(--c-ink); border-color: var(--c-ink); }
.btn--orange { background: var(--c-orange); border-color: var(--c-orange); color: #1A1006; }
.btn--orange:hover { background: #FF9B4C; border-color: #FF9B4C; color: #1A1006; }

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--c-neon);
}
.link-more::after { content: "→"; transition: transform .16s var(--ease); }
.link-more:hover::after { transform: translateX(4px); }

/* ---------- 8. 面包屑 / 辅助文本 ---------- */
.breadcrumbs { margin-block: clamp(16px, 2.4vw, 28px); }
.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-muted);
}
.breadcrumbs__item a { color: var(--c-muted); transition: color .16s var(--ease); }
.breadcrumbs__item a:hover { color: var(--c-neon); }
.breadcrumbs__item[aria-current="page"] { color: var(--c-ink); }
.breadcrumbs__sep { color: var(--c-line); }

.note {
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-muted);
  border-left: 2px solid var(--c-line);
  padding-left: 14px;
}
.note--neon { border-left-color: var(--c-neon); }
.rule { height: 1px; border: 0; background: var(--c-line); margin-block: clamp(20px, 3vw, 36px); }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 8px 18px; font-size: 15px; }
.kv dt { font-family: var(--font-mono); font-size: 12px; letter-spacing: .12em; color: var(--c-muted); }
.kv dd { color: var(--c-ink); }

/* ---------- 9. 图片容器（供页面阶段放置图片） ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: linear-gradient(150deg, #111821 0%, var(--c-deep) 58%, var(--c-moss) 100%);
  border: 1px solid var(--c-line);
}
.media img, .media video { width: 100%; height: 100%; object-fit: cover; }
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(180deg, rgba(255, 255, 255, .05) 0 1px, rgba(0, 0, 0, 0) 1px 5px);
  opacity: .5;
}
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }
.media--pano { aspect-ratio: 21 / 9; }
.media__placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--c-muted);
}
.media__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--c-ink);
  background: rgba(7, 9, 12, .74);
}

/* ---------- 10. 横向滑动 / 表格 / 档位组 ---------- */
.scroller {
  display: flex;
  gap: clamp(14px, 1.6vw, 22px);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 14px;
  scrollbar-color: var(--c-line) transparent;
}
.scroller > * { flex: 0 0 clamp(238px, 30vw, 344px); scroll-snap-align: start; }
.scroller::-webkit-scrollbar { height: 4px; }
.scroller::-webkit-scrollbar-track { background: #0E141B; }
.scroller::-webkit-scrollbar-thumb { background: var(--c-line); }
.scroller::-webkit-scrollbar-thumb:hover { background: var(--c-neon); }

.table-wrap { overflow-x: auto; background: var(--c-panel); border: 1px solid var(--c-line); }
.data-table { min-width: 640px; font-size: 15px; }
.data-table th, .data-table td { padding: 14px 16px; text-align: left; border-bottom: 1px solid var(--c-line); }
.data-table th {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-muted);
  background: var(--c-deep);
}
.data-table tr:hover td { background: var(--c-lift); }
.data-table td.is-num { font-family: var(--font-mono); font-weight: 600; color: var(--c-neon); }

.segmented { display: inline-flex; border: 1px solid var(--c-line); background: var(--c-deep); }
.segmented__btn {
  padding: 9px 16px;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--c-muted);
  border-right: 1px solid var(--c-line);
  transition: color .16s var(--ease), background-color .16s var(--ease);
}
.segmented__btn:last-child { border-right: 0; }
.segmented__btn:hover { color: var(--c-ink); }
.segmented__btn[aria-pressed="true"] { background: var(--c-neon); color: #07090C; }

/* ---------- 11. 头部：状态条 / 品牌轨道 / 主导航 ---------- */
.site-header { position: relative; z-index: 60; }

.statusbar {
  position: fixed;
  top: 0;
  left: var(--rail-w);
  right: 0;
  height: var(--status-h);
  z-index: 52;
  background: #0B0F14;
  border-bottom: 1px solid var(--c-line);
  display: flex;
  align-items: center;
}
.statusbar__inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad-x);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--c-muted);
  text-transform: uppercase;
}
.statusbar__item { display: inline-flex; align-items: center; gap: 8px; white-space: nowrap; }
.statusbar__dot { width: 6px; height: 6px; background: var(--c-neon); flex: none; }
.statusbar__item--ver { color: var(--c-ink); }
.statusbar__item--hours { letter-spacing: .16em; }
.statusbar__item--icp { justify-self: end; color: #5A6673; }

.rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  z-index: 70;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 14px 0 16px;
  background: linear-gradient(180deg, #0B0F14 0%, var(--c-void) 62%);
  border-right: 1px solid var(--c-line);
}
.rail__brand { display: flex; flex-direction: column; align-items: center; gap: 12px; color: var(--c-ink); }
.rail__mark {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  background: var(--c-neon);
  color: #07090C;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
}
.rail__name {
  writing-mode: vertical-rl;
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .34em;
  text-transform: uppercase;
  transition: color .16s var(--ease);
}
.rail__brand:hover .rail__name { color: var(--c-neon); }
.rail__index { margin: auto 0; display: flex; flex-direction: column; align-items: center; gap: 12px; }
.rail__tick {
  width: 18px;
  height: 2px;
  background: var(--c-line);
  transition: width .16s var(--ease), background-color .16s var(--ease);
}
.rail__tick.is-active { width: 30px; background: var(--c-neon); }
.rail__top {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: 1px solid var(--c-line);
  color: var(--c-muted);
  font-family: var(--font-mono);
  font-size: 13px;
  opacity: 0;
  visibility: hidden;
  transition: opacity .2s var(--ease), visibility .2s var(--ease), color .16s var(--ease), border-color .16s var(--ease);
}
.rail__top.is-visible { opacity: 1; visibility: visible; }
.rail__top:hover { color: var(--c-neon); border-color: var(--c-neon); }

.masthead {
  position: fixed;
  top: calc(var(--railbar-h) + var(--status-h));
  left: var(--rail-w);
  right: 0;
  height: var(--mast-h);
  z-index: 51;
  display: flex;
  align-items: center;
  background: rgba(7, 9, 12, .88);
  border-bottom: 1px solid var(--c-line);
  backdrop-filter: blur(10px);
}
.masthead__inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad-x);
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 32px);
}
.masthead__label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--c-muted);
  white-space: nowrap;
}
.masthead__label::before { content: ""; width: 26px; height: 1px; background: var(--c-neon); }

.mainnav { margin-left: auto; }
.mainnav__list { display: flex; align-items: center; gap: clamp(12px, 1.8vw, 28px); }
.mainnav__link {
  position: relative;
  display: inline-block;
  padding: 6px 0;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--c-muted);
  transition: color .16s var(--ease);
}
.mainnav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--c-neon);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .16s var(--ease);
}
.mainnav__link:hover { color: var(--c-ink); }
.mainnav__link:hover::after { transform: scaleX(1); }
.mainnav__link[aria-current="page"] { color: var(--c-neon); }
.mainnav__link[aria-current="page"]::after { transform: scaleX(1); }

.navtoggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 13px;
  border: 1px solid var(--c-line);
  color: var(--c-ink);
  font-size: 12px;
  letter-spacing: .16em;
}
.navtoggle__bars { position: relative; display: block; width: 16px; height: 10px; }
.navtoggle__bars::before, .navtoggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1.5px;
  background: currentColor;
  transition: transform .2s var(--ease), top .2s var(--ease), bottom .2s var(--ease);
}
.navtoggle__bars::before { top: 0; }
.navtoggle__bars::after { bottom: 0; }
.navtoggle[aria-expanded="true"] { color: var(--c-neon); border-color: var(--c-neon); }
.navtoggle[aria-expanded="true"] .navtoggle__bars::before { top: 4px; transform: rotate(45deg); }
.navtoggle[aria-expanded="true"] .navtoggle__bars::after { bottom: 4.5px; transform: rotate(-45deg); }

.progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  pointer-events: none;
}
.progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--c-neon), var(--c-cyan));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .12s linear;
}

/* ---------- 12. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 112px);
  padding: clamp(36px, 5vw, 66px) var(--pad-x) 26px;
  background: #090D12;
  border-top: 1px solid var(--c-line);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: min(340px, 42%);
  height: 3px;
  background: linear-gradient(90deg, var(--c-neon), var(--c-cyan) 62%, rgba(0, 0, 0, 0));
}
.footer__inner { max-width: var(--maxw); margin-inline: auto; }
.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.5fr;
  gap: clamp(24px, 4vw, 56px);
  padding-bottom: clamp(26px, 4vw, 46px);
}
.footer__block { min-width: 0; }
.footer__mark {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 900;
  letter-spacing: .02em;
  color: var(--c-ink);
}
.footer__mark-badge {
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  background: var(--c-neon);
  color: #07090C;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
}
.footer__line { margin-top: 12px; font-size: 15px; color: var(--c-muted); max-width: 44ch; }
.footer__title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--c-muted);
  margin-bottom: 14px;
}
.footer__links { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 18px; }
.footer__links a {
  position: relative;
  font-size: 15px;
  color: var(--c-muted);
  transition: color .16s var(--ease);
}
.footer__links a:hover { color: var(--c-neon); }

.contact-list { display: grid; gap: 2px; }
.contact-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 4px 14px;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px solid var(--c-line);
}
.contact-item--stack { grid-template-columns: minmax(0, 1fr); }
.contact-item__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--c-muted);
  white-space: nowrap;
}
.contact-item__value { font-size: 15px; color: var(--c-ink); overflow-wrap: anywhere; }
.contact-item__value--mono { font-family: var(--font-mono); letter-spacing: .04em; }
.copy-btn {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  padding: 3px 9px;
  border: 1px solid var(--c-line);
  color: var(--c-muted);
  transition: color .16s var(--ease), background-color .16s var(--ease), border-color .16s var(--ease);
}
.copy-btn:hover { background: var(--c-neon); border-color: var(--c-neon); color: #07090C; }
.copy-btn.is-done { background: var(--c-cyan); border-color: var(--c-cyan); color: #06110E; }
.copy-btn:focus-visible { outline: none; box-shadow: inset 0 0 0 2px var(--c-neon); }

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-top: 20px;
  border-top: 1px solid var(--c-line);
}
.footer__policy { display: flex; align-items: center; gap: 10px; font-size: 14px; }
.footer__policy a { color: var(--c-muted); transition: color .16s var(--ease); }
.footer__policy a:hover { color: var(--c-neon); }
.footer__sep { color: var(--c-line); }
.footer__copyright { font-family: var(--font-mono); font-size: 12px; letter-spacing: .08em; color: #5A6673; }

/* ---------- 13. 响应式 ---------- */
@media (max-width: 1024px) {
  .masthead__label { display: none; }
  .navtoggle { display: inline-flex; }
  .masthead__inner { justify-content: flex-end; gap: 12px; }
  .mainnav {
    position: fixed;
    top: var(--shell-h);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    margin-left: 0;
    padding: 6px var(--pad-x) 22px;
    max-height: calc(100vh - var(--shell-h));
    overflow-y: auto;
    background: var(--c-deep);
    border-bottom: 1px solid var(--c-line);
    box-shadow: 0 28px 52px rgba(0, 0, 0, .6);
    z-index: 49;
  }
  .mainnav[data-open] { display: flex; }
  .mainnav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .mainnav__item + .mainnav__item { border-top: 1px solid var(--c-line); }
  .mainnav__link { display: block; padding: 15px 0; font-size: 15px; letter-spacing: .14em; }
  .mainnav__link::after { display: none; }
  .mainnav__link[aria-current="page"]::before {
    content: "";
    display: inline-block;
    width: 12px;
    height: 2px;
    margin-right: 10px;
    vertical-align: middle;
    background: var(--c-neon);
  }
}

@media (max-width: 900px) {
  :root {
    --rail-w: 0px;
    --railbar-h: 48px;
    --status-h: 30px;
    --mast-h: 64px;
  }
  body { padding-left: 0; }
  .rail {
    top: 0;
    left: 0;
    right: 0;
    bottom: auto;
    width: auto;
    height: var(--railbar-h);
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 0 var(--pad-x);
    border-right: 0;
    border-bottom: 1px solid var(--c-line);
  }
  .rail__brand { flex-direction: row; gap: 10px; }
  .rail__mark { width: 26px; height: 26px; font-size: 12px; }
  .rail__name { writing-mode: horizontal-tb; font-size: 12px; letter-spacing: .26em; }
  .rail__index { flex-direction: row; align-items: center; gap: 8px; margin: 0; }
  .rail__tick { width: 2px; height: 14px; }
  .rail__tick.is-active { width: 2px; height: 22px; background: var(--c-neon); }
  .rail__top { width: 30px; height: 30px; font-size: 12px; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .footer__block--brand { grid-column: 1 / -1; }
}

@media (max-width: 860px) {
  .span-4, .span-6, .span-8 { grid-column: span 12; }
  .chapter { grid-template-columns: minmax(0, 1fr); gap: 8px; }
  .chapter__index { font-size: clamp(46px, 14vw, 74px); }
}

@media (max-width: 680px) {
  body { font-size: 16px; line-height: 1.7; }
  .footer__grid { grid-template-columns: minmax(0, 1fr); }
  .footer__links { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .contact-item { grid-template-columns: auto minmax(0, 1fr); }
  .contact-item .copy-btn { grid-column: 2; justify-self: start; }
  .footer__bottom { flex-direction: column; align-items: flex-start; }
  .scroller > * { flex-basis: min(78vw, 320px); }
}

@media (max-width: 560px) {
  .statusbar__inner { grid-template-columns: 1fr auto; font-size: 10px; letter-spacing: .08em; }
  .statusbar__item--ver { display: none; }
  .btn { padding: 10px 15px; font-size: 12px; letter-spacing: .1em; }
}

/* ---------- 14. 减少动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .panel:hover { transform: none; }
  .link-more:hover::after { transform: none; }
}