/* ==========================================================================
   三亿赛事 · 共享样式表 /assets/site.css
   夜间球场数据指挥中心：深空底 / 蓝图网格 / 粗边框硬阴影 / 冷暖双温区
   ========================================================================== */

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

/* ---------- 2. 设计令牌 ---------- */
:root {
  --ink-900: #050912;
  --ink-800: #0A1224;
  --ink-700: #121C36;
  --line-600: #22304F;
  --text-100: #EDF3FF;
  --text-300: #9FB0CE;
  --cool-400: #24D3FF;
  --cool-600: #4C7BFF;
  --pulse-500: #2BF5A6;
  --warm-400: #FF8A3D;
  --warm-300: #FFC53D;
  --violet-500: #7A5CFF;

  --font-display: "Arial Narrow", "Oswald", "Helvetica Neue", Arial, "PingFang SC", sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Inter, system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "JetBrains Mono", "Noto Sans Mono", Consolas, "Courier New", "SimSun", monospace;

  --frame: 12px;
  --shell-max: 1360px;
  --pad-inline: clamp(1rem, 3vw, 2.5rem);
  --shadow-hard: 6px 6px 0 rgba(0, 0, 0, 0.62);
  --shadow-hard-lg: 10px 10px 0 rgba(0, 0, 0, 0.62);
  --ease: cubic-bezier(0.2, 0.7, 0.25, 1);
}

@media (max-width: 720px) {
  :root { --frame: 6px; --pad-inline: 0.9rem; }
}

/* ---------- 3. 基础排版与背景分区 ---------- */
body {
  position: relative;
  min-height: 100vh;
  padding: var(--frame);
  background-color: var(--ink-900);
  background-image:
    radial-gradient(120% 70% at 8% -12%, rgba(36, 211, 255, 0.14), transparent 62%),
    radial-gradient(100% 60% at 96% 4%, rgba(255, 138, 61, 0.10), transparent 60%),
    linear-gradient(to right, rgba(34, 48, 79, 0.42) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(34, 48, 79, 0.42) 1px, transparent 1px);
  background-size: auto, auto, 96px 96px, 96px 96px;
  background-attachment: fixed, fixed, fixed, fixed;
  color: var(--text-100);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
}

/* 细线框架：贴住视口四边，导航成为页面边框的一部分 */
body::before {
  content: "";
  position: fixed;
  inset: var(--frame);
  z-index: 200;
  pointer-events: none;
  border: 1px solid var(--line-600);
  background-image:
    linear-gradient(90deg, var(--cool-400), rgba(36, 211, 255, 0)),
    linear-gradient(180deg, var(--cool-400), rgba(36, 211, 255, 0)),
    linear-gradient(270deg, var(--warm-400), rgba(255, 138, 61, 0)),
    linear-gradient(0deg, var(--warm-400), rgba(255, 138, 61, 0));
  background-repeat: no-repeat;
  background-size: 72px 1px, 1px 72px, 72px 1px, 1px 72px;
  background-position: left top, left top, right bottom, right bottom;
}

/* 复古电子屏扫描线 */
html::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 150;
  pointer-events: none;
  background-image: repeating-linear-gradient(to bottom,
    rgba(255, 255, 255, 0.032) 0 1px,
    rgba(0, 0, 0, 0) 1px 4px);
  opacity: 0.7;
}

:focus-visible {
  outline: 2px solid var(--cool-400);
  outline-offset: 3px;
  border-radius: 2px;
}

.mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-300);
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

/* ---------- 4. Skip link ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: var(--frame);
  z-index: 400;
  transform: translateY(-140%);
  padding: 0.7rem 1.2rem;
  background: var(--pulse-500);
  color: #04140c;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  border: 2px solid var(--pulse-500);
  border-top: 0;
  transition: transform 0.2s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 5. 头部框架导航 ---------- */
.site-header {
  position: sticky;
  top: var(--frame);
  z-index: 80;
  background: var(--ink-900);
  background-image: linear-gradient(180deg, rgba(10, 18, 36, 0.96), rgba(5, 9, 18, 0.99));
  border-bottom: 2px solid var(--line-600);
  transition: box-shadow 0.28s var(--ease);
}
.site-header[data-scrolled] {
  box-shadow: 0 1px 0 0 rgba(36, 211, 255, 0.32), 0 18px 26px -22px rgba(0, 0, 0, 0.95);
}
html[data-view="legacy"] .site-header[data-scrolled] {
  box-shadow: 0 1px 0 0 rgba(255, 138, 61, 0.36), 0 18px 26px -22px rgba(0, 0, 0, 0.95);
}

.utility-strip {
  display: flex;
  align-items: center;
  gap: clamp(0.6rem, 2vw, 1.6rem);
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 0.45rem var(--pad-inline);
  background: var(--ink-800);
  border-bottom: 1px solid var(--line-600);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--text-300);
  overflow-x: auto;
  white-space: nowrap;
  scrollbar-width: none;
}
.utility-strip::-webkit-scrollbar { display: none; }
.utility-strip__item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.utility-strip__item--end { margin-left: auto; }

.mono-tag {
  display: inline-block;
  padding: 0 0.4rem;
  border: 1px solid rgba(122, 92, 255, 0.5);
  border-radius: 2px;
  color: var(--violet-500);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--pulse-500);
  box-shadow: 0 0 0 3px rgba(43, 245, 166, 0.18);
  animation: dot-blip 2.6s var(--ease) infinite;
}
@keyframes dot-blip {
  0%, 62%, 100% { transform: scale(1); opacity: 1; }
  72% { transform: scale(0.5); opacity: 0.45; }
}

.masthead__bar {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-areas: "brand nav actions";
  align-items: center;
  gap: clamp(0.75rem, 2vw, 1.6rem);
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: clamp(0.6rem, 1.5vw, 0.95rem) var(--pad-inline);
}

.brand {
  grid-area: brand;
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
}
.brand__mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: none;
  border: 2px solid var(--cool-400);
  background: var(--ink-800);
  box-shadow: 4px 4px 0 rgba(36, 211, 255, 0.24);
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--cool-400);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.25; }
.brand__name { font-size: 19px; font-weight: 700; letter-spacing: 0.06em; }
.brand__line {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--text-300);
}

.nav-toggle {
  grid-area: toggle;
  display: none;
  align-items: center;
  gap: 0.55rem;
  padding: 0.55rem 0.8rem;
  background: var(--ink-800);
  border: 2px solid var(--line-600);
  border-radius: 2px;
  color: var(--text-100);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  cursor: pointer;
}
.nav-toggle__icon { display: inline-flex; flex-direction: column; gap: 3px; width: 16px; }
.nav-toggle__icon span {
  display: block;
  height: 2px;
  background: var(--cool-400);
  transition: transform 0.22s var(--ease), opacity 0.22s var(--ease);
}
.nav-toggle[aria-expanded="true"] { border-color: var(--pulse-500); color: var(--pulse-500); }
.nav-toggle[aria-expanded="true"] .nav-toggle__icon span { background: var(--pulse-500); }
.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

.site-nav { grid-area: nav; justify-self: center; }
.site-nav__list { display: flex; align-items: stretch; counter-reset: navitem; }
.site-nav__item { display: flex; }
.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.42rem;
  padding: 0.5rem clamp(0.5rem, 1vw, 0.95rem);
  border-left: 1px solid rgba(34, 48, 79, 0.85);
  color: var(--text-300);
  font-size: 15px;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease);
}
.site-nav__item:last-child .site-nav__link { border-right: 1px solid rgba(34, 48, 79, 0.85); }
.site-nav__link::before {
  counter-increment: navitem;
  content: "0" counter(navitem);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--violet-500);
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--pulse-500);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.24s var(--ease);
}
.site-nav__link:hover { color: var(--text-100); background: rgba(18, 28, 54, 0.75); }
.site-nav__link:hover::after { transform: scaleX(1); }
.site-nav__link[aria-current="page"] {
  color: var(--pulse-500);
  background: rgba(43, 245, 166, 0.08);
}
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); }

.masthead__actions {
  grid-area: actions;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.scroll-meter {
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: rgba(34, 48, 79, 0.65);
  overflow: hidden;
}
.scroll-meter__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cool-400), var(--pulse-500) 58%, var(--warm-400));
}

.view-switch {
  position: fixed;
  right: calc(var(--frame) + 16px);
  bottom: calc(var(--frame) + 16px);
  z-index: 95;
  display: flex;
  align-items: center;
  gap: 0.3rem;
  max-width: calc(100vw - (var(--frame) * 2) - 32px);
  padding: 0.32rem;
  overflow-x: auto;
  white-space: nowrap;
  scrollbar-width: none;
  background: rgba(10, 18, 36, 0.94);
  border: 2px solid var(--line-600);
  border-radius: 3px;
  box-shadow: 5px 5px 0 rgba(0, 0, 0, 0.6);
}
.view-switch::-webkit-scrollbar { display: none; }
.view-switch__label {
  padding: 0 0.35rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--violet-500);
}
.view-switch__btn {
  padding: 0.38rem 0.6rem;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 2px;
  color: var(--text-300);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  white-space: nowrap;
  cursor: pointer;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.view-switch__btn:hover { color: var(--text-100); }
.view-switch__btn.is-active {
  background: var(--ink-700);
  border-color: var(--cool-600);
  color: var(--cool-400);
}
html[data-view="legacy"] .view-switch { border-color: rgba(255, 138, 61, 0.55); }
html[data-view="legacy"] .view-switch__btn.is-active {
  background: rgba(255, 138, 61, 0.12);
  border-color: var(--warm-400);
  color: var(--warm-400);
}
html[data-view="legacy"] .view-switch__label { color: var(--warm-300); }

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.62rem 1.05rem;
  border: 2px solid var(--line-600);
  border-radius: 2px;
  background: transparent;
  color: var(--text-100);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: transform 0.18s var(--ease), background-color 0.18s var(--ease),
    color 0.18s var(--ease), border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}
.btn:hover { transform: translate(-2px, -2px); }
.btn:active { transform: translate(0, 0); }
.btn--primary {
  background: var(--pulse-500);
  border-color: var(--pulse-500);
  color: #04140c;
  box-shadow: 5px 5px 0 rgba(43, 245, 166, 0.22);
}
.btn--primary:hover { box-shadow: 7px 7px 0 rgba(43, 245, 166, 0.3); }
.btn--ghost {
  background: rgba(10, 18, 36, 0.7);
  border-color: var(--cool-600);
  color: var(--text-100);
  box-shadow: 5px 5px 0 rgba(76, 123, 255, 0.18);
}
.btn--ghost:hover { background: rgba(76, 123, 255, 0.16); }
.btn--warm {
  background: rgba(255, 138, 61, 0.12);
  border-color: var(--warm-400);
  color: var(--warm-300);
  box-shadow: 5px 5px 0 rgba(255, 138, 61, 0.2);
}
.btn--warm:hover { background: rgba(255, 138, 61, 0.22); }

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 8vw, 7rem);
  padding: clamp(2.5rem, 5vw, 4.25rem) var(--pad-inline) calc(var(--frame) + 96px);
  background: var(--ink-900);
  background-image: linear-gradient(180deg, rgba(18, 28, 54, 0.7), rgba(5, 9, 18, 0) 46%);
  border-top: 2px solid var(--line-600);
}
.site-footer::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 2px;
  height: 9px;
  pointer-events: none;
  background-image: repeating-linear-gradient(90deg, var(--line-600) 0 1px, transparent 1px 32px);
  opacity: 0.85;
}
.site-footer__inner { width: 100%; max-width: var(--shell-max); margin-inline: auto; }

.site-footer__top {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 3.4vw, 3rem);
  padding-top: 1.25rem;
}
@media (min-width: 760px) {
  .site-footer__top { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-footer__brand { grid-column: 1 / -1; }
}
@media (min-width: 1080px) {
  .site-footer__top { grid-template-columns: minmax(0, 1.6fr) repeat(3, minmax(0, 1fr)); }
  .site-footer__brand { grid-column: auto; }
}

.site-footer__brand-name {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.08em;
}
.site-footer__brand-text {
  margin-top: 0.7rem;
  max-width: 46ch;
  color: var(--text-300);
  font-size: 15px;
  line-height: 1.8;
}
.site-footer__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-top: 1.4rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line-600);
}
.site-footer__stat { display: flex; flex-direction: column; }
.site-footer__stat-num {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--cool-400);
  font-variant-numeric: tabular-nums;
}
.site-footer__stat:nth-child(2) .site-footer__stat-num { color: var(--pulse-500); }
.site-footer__stat:nth-child(3) .site-footer__stat-num { color: var(--warm-400); }
.site-footer__stat-label {
  margin-top: 0.35rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-300);
}

.site-footer__col { min-width: 0; }
.site-footer__col-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--violet-500);
}
.site-footer__col-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line-600);
}
.site-footer__links { margin-top: 0.9rem; display: grid; gap: 0.1rem; }
.site-footer__link {
  display: inline-block;
  padding: 0.4rem 0;
  color: var(--text-300);
  font-size: 15px;
  border-bottom: 1px solid rgba(34, 48, 79, 0.5);
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}
.site-footer__link:hover {
  color: var(--cool-400);
  transform: translateX(4px);
}

.site-footer__contact {
  margin-top: clamp(2rem, 4vw, 3rem);
  padding: clamp(1rem, 2.4vw, 1.6rem);
  background: var(--ink-800);
  border: 2px solid var(--line-600);
  box-shadow: var(--shadow-hard);
}
.site-footer__contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--warm-300);
}
.site-footer__contact-line {
  margin-top: 0.6rem;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--text-100);
  word-break: break-word;
}
.site-footer__contact-note {
  margin-top: 0.4rem;
  font-size: 13.5px;
  color: var(--text-300);
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.5rem;
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
  padding-top: 1.1rem;
  border-top: 1px solid var(--line-600);
}
.site-footer__legal-line {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--text-300);
}
.site-footer__legal-nav { display: flex; flex-wrap: wrap; gap: 1.1rem; margin-left: auto; }
.site-footer__legal-link {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-300);
  border-bottom: 1px solid var(--line-600);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.site-footer__legal-link:hover { color: var(--pulse-500); border-color: var(--pulse-500); }

/* ---------- 8. 通用布局组件 ---------- */
.container {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--pad-inline);
}
.section {
  padding-block: clamp(3rem, 7vw, 6.5rem);
  border-top: 1px solid var(--line-600);
}
.section:first-of-type { border-top: 0; }
.grid { display: grid; gap: clamp(1rem, 2.4vw, 1.75rem); }
.grid--split { grid-template-columns: 1fr; }
@media (min-width: 960px) {
  .grid--split { grid-template-columns: minmax(280px, 1fr) minmax(0, 1.65fr); align-items: start; }
}
.grid--cols { grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); }
.rule { height: 1px; margin-block: clamp(1.5rem, 4vw, 3rem); border: 0; background: var(--line-600); }

/* ---------- 9. 通用内容组件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--violet-500);
}
.eyebrow::before { content: ""; width: 26px; height: 2px; background: currentColor; }

.prose {
  max-width: 72ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--text-100);
}
.prose > * + * { margin-top: 1.1em; }
.prose h2 { font-size: clamp(1.4rem, 2.6vw, 1.8rem); line-height: 1.4; margin-top: 2.2em; }
.prose h3 { font-size: clamp(1.1rem, 1.8vw, 1.3rem); line-height: 1.5; margin-top: 1.8em; }
.prose ul, .prose ol { display: grid; gap: 0.5rem; padding-left: 0; }
.prose ul li { position: relative; padding-left: 1.2rem; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.78em;
  width: 10px; height: 2px;
  background: var(--pulse-500);
}
.prose ol { counter-reset: proselist; }
.prose ol li { position: relative; padding-left: 1.8rem; }
.prose ol li::before {
  counter-increment: proselist;
  content: counter(proselist, decimal-leading-zero);
  position: absolute;
  left: 0; top: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cool-400);
}
.prose a {
  color: var(--cool-400);
  border-bottom: 1px solid rgba(36, 211, 255, 0.45);
}
.prose a:hover { border-color: var(--cool-400); }
.prose strong { color: var(--pulse-500); font-weight: 600; }

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.12rem 0.45rem;
  border: 1px solid currentColor;
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.tag--cool { color: var(--cool-400); }
.tag--warm { color: var(--warm-400); }
.tag--violet { color: var(--violet-500); }
.tag--pulse { color: var(--pulse-500); }

.stat { display: flex; flex-direction: column; gap: 0.3rem; }
.stat__value {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 7vw, 5rem);
  line-height: 0.95;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--cool-400);
}
.stat__unit { font-size: 0.4em; margin-left: 0.15em; letter-spacing: 0; }
.stat__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--text-300);
}
.stat--warm .stat__value { color: var(--warm-400); }
.stat--pulse .stat__value { color: var(--pulse-500); }

.panel {
  padding: clamp(1rem, 2.4vw, 1.75rem);
  background: var(--ink-800);
  border: 2px solid var(--line-600);
  box-shadow: var(--shadow-hard);
}
.panel--cool { border-color: rgba(36, 211, 255, 0.5); }
.panel--warm { border-color: rgba(255, 138, 61, 0.5); }
.panel--flat { box-shadow: none; }

.media-frame {
  position: relative;
  overflow: hidden;
  border: 2px solid var(--line-600);
  background: var(--ink-800);
  box-shadow: var(--shadow-hard);
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(34, 48, 79, 0.6) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(34, 48, 79, 0.6) 1px, transparent 1px);
  background-size: 48px 48px, 48px 48px;
  opacity: 0.55;
}
.media-frame__inner {
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 16 / 9;
  background: radial-gradient(120% 100% at 20% 0%, rgba(36, 211, 255, 0.1), transparent 62%), var(--ink-800);
}
.media-frame img { width: 100%; height: 100%; object-fit: cover; }
.media-frame__caption {
  padding: 0.6rem 0.8rem;
  border-top: 1px solid var(--line-600);
  background: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--text-300);
}

.table-basic {
  border: 2px solid var(--line-600);
  background: var(--ink-800);
  font-size: 14.5px;
  font-variant-numeric: tabular-nums;
}
.table-basic th, .table-basic td {
  padding: 0.6rem 0.8rem;
  text-align: left;
  border-bottom: 1px solid var(--line-600);
}
.table-basic thead th {
  background: var(--ink-700);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--warm-400);
}
.table-basic tbody tr:nth-child(even) { background: var(--ink-700); }
.table-basic tbody tr:hover { background: rgba(36, 211, 255, 0.08); }
.table-basic tbody tr:last-child td { border-bottom: 0; }

.fold {
  border: 2px solid var(--line-600);
  background: var(--ink-800);
}
.fold + .fold { margin-top: -2px; }
.fold__summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.9rem clamp(0.9rem, 2vw, 1.3rem);
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-100);
}
.fold__summary::-webkit-details-marker { display: none; }
.fold__summary::before {
  content: "+";
  flex: none;
  width: 20px;
  font-family: var(--font-mono);
  color: var(--pulse-500);
}
.fold[open] .fold__summary::before { content: "–"; }
.fold[open] .fold__summary { border-bottom: 1px solid var(--line-600); }
.fold__body {
  padding: clamp(0.9rem, 2vw, 1.3rem);
  color: var(--text-300);
  font-size: 15.5px;
  line-height: 1.85;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding-block: 1rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-300);
}
.breadcrumbs a { color: var(--text-300); border-bottom: 1px solid transparent; }
.breadcrumbs a:hover { color: var(--cool-400); border-color: currentColor; }
.breadcrumbs__sep { color: var(--line-600); }
.breadcrumbs [aria-current="page"] { color: var(--text-100); }

/* ---------- 10. 动效：错峰显现 ---------- */
html.has-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.62s var(--ease), transform 0.62s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}
html.has-reveal [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 11. 响应式：折叠导航 ---------- */
@media (max-width: 1119px) {
  .nav-toggle { display: inline-flex; }
  .masthead__bar {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "brand toggle"
      "nav nav"
      "actions actions";
  }
  .site-nav {
    justify-self: stretch;
    width: 100%;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: max-height 0.34s var(--ease), opacity 0.22s var(--ease);
  }
  .site-nav[data-open] {
    max-height: 40rem;
    opacity: 1;
    visibility: visible;
  }
  .site-nav__list { flex-direction: column; border-top: 1px solid var(--line-600); }
  .site-nav__item { width: 100%; }
  .site-nav__link {
    width: 100%;
    padding: 0.8rem 0.6rem;
    border-left: 0;
    border-bottom: 1px solid rgba(34, 48, 79, 0.75);
    font-size: 16px;
  }
  .site-nav__item:last-child .site-nav__link { border-right: 0; }
  .site-nav__link::after { display: none; }
  .site-nav__link[aria-current="page"] { border-left: 3px solid var(--pulse-500); }
  .masthead__actions { display: none; flex-wrap: wrap; width: 100%; }
  .site-nav[data-open] ~ .masthead__actions { display: flex; padding-top: 0.35rem; }
}

@media (max-width: 560px) {
  body { font-size: 16px; }
  .brand__line { display: none; }
  .brand__mark { width: 38px; height: 38px; font-size: 12px; }
  .masthead__actions .btn { flex: 1 1 auto; }
  .view-switch {
    right: calc(var(--frame) + 8px);
    bottom: calc(var(--frame) + 8px);
    max-width: calc(100vw - (var(--frame) * 2) - 16px);
  }
  .site-footer__legal-nav { margin-left: 0; width: 100%; }
}

/* ---------- 12. 无障碍与降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    transition-delay: 0ms !important;
  }
  html.has-reveal [data-reveal] { opacity: 1; transform: none; }
  .dot { animation: none; }
}