/* =========================================================
   天天电竞 /assets/site.css
   共享外壳：reset、变量、中文排版、头部、页脚、通用组件
   ========================================================= */

*, *::before, *::after { box-sizing: border-box; }

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

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

ul, ol { list-style: none; }

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

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

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

[hidden] { display: none !important; }

/* ------------------------ 变量 ------------------------ */
:root {
  --ink: #05070C;
  --ink-2: #0B1220;
  --line: #1E2A3A;
  --cyan: #00E6D2;
  --cyan-dim: #08A79B;
  --magenta: #FF2D7A;
  --yellow: #FFD400;
  --white: #F2F5F7;
  --gray: #8A94A6;
  --paper: #EDEDED;
  --green: #37E39B;
  --orange: #FF8A3D;

  --font-display: "Barlow Condensed", "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: Inter, "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --wrap: 1480px;
  --gap: 24px;
  --rail-w: 232px;
  --header-h: 64px;
  --header-total: 94px;
  --radius: 0px;
  --shadow-1: 0 18px 44px rgba(0, 0, 0, .55);
}

/* ------------------------ 基础排版 ------------------------ */
body {
  min-height: 100vh;
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: .01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background: repeating-linear-gradient(180deg,
    rgba(242, 245, 247, .035) 0 1px,
    rgba(242, 245, 247, 0) 1px 4px);
  animation: scan 16s linear infinite;
}

@keyframes scan {
  from { background-position: 0 0; }
  to   { background-position: 0 420px; }
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: .015em;
}

h1 { font-size: clamp(32px, 5.4vw, 72px); }
h2 { font-size: clamp(24px, 3.4vw, 44px); }
h3 { font-size: clamp(20px, 2.2vw, 28px); }

p { text-wrap: pretty; }

strong, b { color: var(--white); font-weight: 700; }

::selection { background: var(--magenta); color: var(--white); }

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

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .04em;
}

.num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -.01em;
}

.muted { color: var(--gray); }

.prose {
  max-width: 68ch;
  color: #CBD3DC;
  font-size: 16.5px;
}

.prose p + p { margin-top: 1em; }

/* ------------------------ 跳转链接 ------------------------ */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--cyan);
  color: var(--ink);
  border: 1px solid var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  transform: translateY(-180%);
  transition: transform .18s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

/* =========================================================
   头部框架
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(5, 7, 12, .94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--cyan);
  box-shadow: 0 1px 0 rgba(255, 45, 122, .35), 0 12px 34px rgba(0, 0, 0, .5);
}

.frame-bar {
  position: relative;
  z-index: 120;
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 30px);
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 clamp(14px, 3vw, 28px);
  min-height: var(--header-h);
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  padding-right: 6px;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.brand__text { display: block; }

.brand__name {
  display: block;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: .1em;
  line-height: 1;
}

.brand__tag {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  color: var(--gray);
}

/* 导航 */
.nav {
  display: flex;
  align-items: center;
  flex: 1 1 auto;
  min-width: 0;
}

.nav__title { display: none; }

.nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.nav__item { display: block; }

.nav__link {
  position: relative;
  display: block;
  padding: 10px 12px;
  white-space: nowrap;
  font-family: var(--font-display);
  font-size: 16.5px;
  letter-spacing: .07em;
  color: var(--gray);
  transition: color .18s ease, background-color .18s ease;
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .22s ease;
}

.nav__link:hover { color: var(--white); }
.nav__link:hover::after { transform: scaleX(1); }

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

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

/* 头部工具区 */
.header-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

/* 版本切换器 */
.ver { position: relative; }

.ver__trigger {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  list-style: none;
  cursor: pointer;
  border: 1px solid var(--cyan);
  background: rgba(0, 230, 210, .07);
  font-family: var(--font-mono);
  font-size: 12px;
  transition: background-color .18s ease, border-color .18s ease;
}

.ver__trigger::-webkit-details-marker { display: none; }

.ver__trigger:hover { background: rgba(0, 230, 210, .16); }

.ver__label {
  color: var(--gray);
  letter-spacing: .1em;
}

.ver__num {
  color: var(--yellow);
  font-weight: 700;
  font-size: 13.5px;
  letter-spacing: .04em;
}

.ver[open] .ver__trigger {
  background: rgba(0, 230, 210, .18);
  border-color: var(--cyan);
}

.ver__panel {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  z-index: 140;
  width: min(252px, 78vw);
  padding: 14px;
  background: var(--ink-2);
  border: 1px solid var(--cyan);
  box-shadow: var(--shadow-1);
}

.ver__hint {
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--gray);
}

.ver__list { display: grid; gap: 6px; }

.ver__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 10px;
  background: var(--ink);
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--white);
  transition: border-color .18s ease, color .18s ease;
}

.ver__item:hover { border-color: var(--cyan); color: var(--cyan); }

.ver__item[aria-current="true"] {
  border-color: var(--magenta);
  color: var(--white);
}

.ver__flag {
  padding: 2px 6px;
  font-size: 10px;
  letter-spacing: .12em;
  color: var(--ink);
  background: var(--paper);
}

.ver__item[aria-current="true"] .ver__flag { background: var(--yellow); }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 11px;
  border: 1px solid var(--line);
  background: var(--ink-2);
  transition: border-color .18s ease;
}

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

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: var(--cyan);
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--cyan);
  transition: transform .2s ease, top .2s ease, background-color .2s ease;
}

.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  top: 0;
  background: var(--magenta);
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  top: 0;
  background: var(--magenta);
  transform: rotate(-45deg);
}

.nav-toggle__text {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gray);
}

/* 遮罩 */
.nav-scrim {
  position: fixed;
  top: var(--header-total);
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 100;
  background: rgba(5, 7, 12, .74);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity .24s ease, visibility .24s ease;
}

.nav-scrim[data-open] {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

/* 状态条 + 滚动进度 */
.ticker {
  border-top: 1px solid var(--line);
  background: linear-gradient(90deg, rgba(0, 230, 210, .1), rgba(5, 7, 12, 0) 58%);
}

.ticker__inner {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 5px clamp(14px, 3vw, 28px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .07em;
  color: var(--gray);
}

.ticker__text { min-width: 0; }

.ticker__dot {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  animation: pulse 2.4s ease-out infinite;
}

@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(0, 230, 210, .55); }
  70%  { box-shadow: 0 0 0 9px rgba(0, 230, 210, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 230, 210, 0); }
}

.ticker__meta {
  margin-left: auto;
  color: var(--cyan-dim);
  font-size: 11px;
  letter-spacing: .12em;
}

.scroll-bar {
  height: 2px;
  background: var(--line);
}

.scroll-bar__fill {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--magenta));
}

/* =========================================================
   页脚
   ========================================================= */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 104px);
  background: var(--ink-2);
  border-top: 1px solid var(--line);
}

.site-footer::before {
  content: "";
  display: block;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--magenta) 55%, var(--yellow));
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(32px, 5vw, 58px) clamp(16px, 3vw, 28px);
}

.footer__col { min-width: 0; }

.footer__col--brand { border-left: 2px solid var(--magenta); padding-left: 16px; }

.footer__brand {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--white);
}

.footer__desc {
  margin-top: 10px;
  max-width: 34ch;
  font-size: 14px;
  color: var(--gray);
}

.footer__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: .22em;
  color: var(--cyan);
  text-transform: uppercase;
}

.footer__links {
  display: grid;
  gap: 8px;
  margin-top: 18px;
}

.footer__link {
  display: inline-block;
  padding-left: 10px;
  border-left: 2px solid var(--line);
  font-size: 15px;
  color: var(--gray);
  transition: color .18s ease, border-color .18s ease;
}

.footer__link:hover {
  color: var(--white);
  border-left-color: var(--magenta);
}

.footer__contact { display: grid; gap: 12px; }

.footer__line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14px;
}

.footer__label {
  min-width: 46px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--gray);
}

.footer__value {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--white);
  word-break: break-all;
}

.footer__note {
  margin-top: 14px;
  font-size: 13px;
  color: var(--gray);
}

.copy {
  padding: 3px 9px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--gray);
  transition: color .18s ease, border-color .18s ease;
}

.copy:hover { color: var(--cyan); border-color: var(--cyan); }

.copy[data-copied] { color: var(--green); border-color: var(--green); }

.footer__stats {
  display: grid;
  gap: 8px;
  margin-top: 20px;
}

.footer__stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 6px;
  border-bottom: 1px dashed var(--line);
}

.footer__stat dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--gray);
}

.footer__stat dd {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--yellow);
}

.footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 14px clamp(16px, 3vw, 28px) 28px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--gray);
}

.footer__icp { color: var(--gray); }

.footer__ver { color: var(--yellow); }

.footer__status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--cyan-dim);
}

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

.dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gray);
}

.dot--ok {
  background: var(--green);
  box-shadow: 0 0 9px rgba(55, 227, 155, .8);
}

/* 复制提示 */
.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--ink-2);
  border: 1px solid var(--cyan);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  opacity: 0;
  visibility: hidden;
  transform: translate(-50%, 14px);
  pointer-events: none;
  transition: opacity .2s ease, transform .2s ease, visibility .2s ease;
}

.toast[data-open] {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

/* =========================================================
   通用布局与组件
   ========================================================= */
main { display: block; }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 clamp(16px, 3vw, 28px);
}

.section { padding: clamp(38px, 6vw, 88px) 0; }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 26px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.section__kicker {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cyan);
}

.section__title { color: var(--white); }

.shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 clamp(16px, 3vw, 28px);
}

.shell__rail,
.shell__aside { display: none; }

.shell__main { min-width: 0; }

.rail__title {
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--cyan);
}

.rail__link {
  display: block;
  padding: 7px 0 7px 10px;
  border-left: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--gray);
  transition: color .18s ease, border-color .18s ease;
}

.rail__link:hover { color: var(--white); border-left-color: var(--cyan); }

.rail__link[aria-current="true"] {
  color: var(--yellow);
  border-left-color: var(--magenta);
}

/* 网格 */
.grid { display: grid; gap: var(--gap); }

.grid--2,
.grid--3 { grid-template-columns: minmax(0, 1fr); }

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid var(--cyan);
  background: transparent;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  transition: background-color .18s ease, color .18s ease, border-color .18s ease;
}

.btn:hover { background: var(--cyan); color: var(--ink); }

.btn--solid {
  background: var(--cyan);
  color: var(--ink);
  font-weight: 700;
}

.btn--solid:hover { background: var(--white); border-color: var(--white); }

.btn--ghost {
  border-color: var(--line);
  color: var(--white);
}

.btn--ghost:hover {
  border-color: var(--magenta);
  background: rgba(255, 45, 122, .12);
  color: var(--white);
}

.btn--sm { padding: 7px 13px; font-size: 12px; }

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--line);
  background: var(--ink-2);
  color: var(--gray);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  white-space: nowrap;
}

.tag--cyan { color: var(--cyan); border-color: rgba(0, 230, 210, .5); background: rgba(0, 230, 210, .08); }
.tag--magenta { color: var(--magenta); border-color: rgba(255, 45, 122, .5); background: rgba(255, 45, 122, .08); }
.tag--yellow { color: var(--ink); background: var(--yellow); border-color: var(--yellow); }
.tag--paper { color: var(--ink); background: var(--paper); border-color: var(--paper); }
.tag--ok { color: var(--green); border-color: rgba(55, 227, 155, .5); }
.tag--wait { color: var(--orange); border-color: rgba(255, 138, 61, .5); }

/* 卡片 */
.card {
  position: relative;
  padding: 20px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}

.card:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
  box-shadow: var(--shadow-1);
}

.card--stack { box-shadow: 6px 6px 0 -1px var(--ink-2), 7px 7px 0 0 var(--line); }

.card__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.card__title {
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: .03em;
  color: var(--white);
}

.card__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--gray);
}

.card__body {
  font-size: 15px;
  line-height: 1.72;
  color: var(--gray);
}

/* 面包屑 */
.breadcrumb {
  border-bottom: 1px solid var(--line);
  padding: 16px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--gray);
}

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

.breadcrumb__item { display: inline-flex; align-items: center; }

.breadcrumb__item::after {
  content: "/";
  margin-left: 8px;
  color: var(--line);
}

.breadcrumb__item:last-child::after { content: ""; }

.breadcrumb__link { color: var(--gray); transition: color .18s ease; }
.breadcrumb__link:hover { color: var(--cyan); }

.breadcrumb__item[aria-current="page"] { color: var(--white); }

/* 图像容器（页面阶段放 <img class="media__img">） */
.media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  background:
    linear-gradient(130deg, rgba(0, 230, 210, .14), rgba(255, 45, 122, .12) 58%, rgba(5, 7, 12, 0) 92%),
    var(--ink-2);
}

.media::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(90deg,
    rgba(242, 245, 247, .05) 0 1px,
    rgba(242, 245, 247, 0) 1px 30px);
}

.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 4 / 5; }

.media__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 6px 10px;
  background: var(--ink);
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--gray);
}

.media__badge { position: absolute; top: 10px; left: 10px; }

/* 斜向切割条 */
.diag {
  height: clamp(24px, 5vw, 62px);
  margin: clamp(26px, 5vw, 56px) 0;
  background: linear-gradient(100deg, rgba(0, 230, 210, .18), rgba(255, 45, 122, .14) 52%, rgba(5, 7, 12, 0) 82%);
  clip-path: polygon(0 0, 100% 24%, 100% 100%, 0 76%);
}

/* 筛选按钮 */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter {
  padding: 7px 14px;
  border: 1px solid var(--line);
  background: var(--ink-2);
  color: var(--gray);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

.filter:hover { color: var(--white); border-color: var(--cyan); }

.filter[aria-pressed="true"] {
  background: var(--magenta);
  border-color: var(--magenta);
  color: var(--white);
}

/* 折叠面板 */
.acc {
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.acc__item + .acc__item { border-top: 1px solid var(--line); }

.acc__sum {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 16px;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: .03em;
  color: var(--white);
}

.acc__sum::-webkit-details-marker { display: none; }

.acc__sum::after {
  content: "+";
  font-family: var(--font-mono);
  color: var(--cyan);
}

.acc__item[open] > .acc__sum::after { content: "–"; }

.acc__body {
  padding: 0 16px 16px;
  font-size: 15px;
  color: var(--gray);
}

/* 显现 */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .5s ease, transform .5s cubic-bezier(.2, .7, .3, 1);
}

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

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 899px) {
  .nav {
    position: fixed;
    top: var(--header-total);
    left: 0;
    bottom: 0;
    z-index: 110;
    display: block;
    width: min(320px, 86vw);
    padding: 22px 20px 30px;
    overflow-y: auto;
    background: var(--ink-2);
    border-top: 1px solid var(--cyan);
    border-right: 1px solid var(--cyan);
    box-shadow: 14px 0 44px rgba(0, 0, 0, .62);
    transform: translateX(-102%);
    transition: transform .26s cubic-bezier(.4, 0, .2, 1);
  }

  .nav[data-open] { transform: translateX(0); }

  .nav__title {
    display: block;
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--line);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .22em;
    color: var(--gray);
  }

  .nav__list {
    display: grid;
    gap: 4px;
    overflow: visible;
  }

  .nav__link {
    padding: 12px 14px;
    border-left: 2px solid var(--line);
    font-size: 19px;
  }

  .nav__link::after { display: none; }

  .nav__link[aria-current="page"] {
    border-left-color: var(--magenta);
    background: rgba(255, 45, 122, .08);
  }

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

  .ticker__meta { display: none; }

  .shell { padding: 0 16px; }
}

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

  .frame-bar {
    gap: 10px;
    padding: 0 14px;
    border-left: 0;
    border-right: 0;
  }

  .brand__tag { display: none; }

  .ver__label { display: none; }
  .ver__trigger { padding: 8px 10px; }
  .ver__num { font-size: 12.5px; }

  .ticker__text { font-size: 11px; letter-spacing: .04em; }

  .footer__copy { margin-left: 0; width: 100%; }

  .media { aspect-ratio: 4 / 3; }
}

@media (max-width: 420px) {
  .nav-toggle__text { display: none; }
}

@media (min-width: 720px) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .nav-scrim { display: none; }
}

@media (min-width: 1024px) {
  .shell {
    grid-template-columns: var(--rail-w) minmax(0, 1fr) minmax(0, 296px);
    align-items: start;
  }

  .shell--wide { grid-template-columns: var(--rail-w) minmax(0, 1fr); }
  .shell--plain { grid-template-columns: minmax(0, 1fr); }

  .shell__rail {
    display: block;
    position: sticky;
    top: calc(var(--header-total) + 26px);
    align-self: start;
    padding-right: 16px;
    border-right: 1px solid var(--line);
  }

  .shell__aside {
    display: block;
    position: sticky;
    top: calc(var(--header-total) + 26px);
    align-self: start;
    padding-left: 16px;
    border-left: 1px solid var(--line);
  }

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

@media (min-width: 1280px) {
  .brand__name { font-size: 23px; }
  .nav__link { font-size: 17px; padding: 10px 14px; }
}

/* =========================================================
   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;
  }

  body::before { animation: none; }

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

@media print {
  body::before, .site-header, .site-footer { display: none; }
  body { background: #fff; color: #000; }
}