/* ===========================================================
   乐动体育 · 九游体育  共享样式表  /assets/site.css
   夜灯下的赛事数据编排台 — 切角、斜线、裁判卡牌色
   =========================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 136px;
}

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

ul, ol { padding: 0; 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;
}

table { border-collapse: collapse; width: 100%; }

/* ---------- 2. Tokens ---------- */
:root {
  --ink: #0B0F0D;
  --pitch: #0F2A20;
  --moss: #1C3A2E;
  --fluoro: #C6F542;
  --volt: #FF7A1A;
  --card-y: #FFD43B;
  --card-r: #E63329;
  --bone: #F2F0E6;
  --rock: #8A8F86;
  --clay: #B4573A;

  --cut: 14px;
  --cut-sm: 10px;
  --tilt: -3deg;

  --gutter: clamp(16px, 4vw, 44px);
  --maxw: 1360px;

  --font-display: "Helvetica Neue", "Arial Narrow", Arial,
                   "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto,
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas,
               "Liberation Mono", "Courier New", monospace;
}

/* ---------- 3. Base ---------- */
body {
  min-height: 100vh;
  overflow-x: clip;
  background-color: var(--ink);
  background-image:
    radial-gradient(circle at 10% -12%, rgba(15, 42, 32, 0.92), transparent 56%),
    radial-gradient(circle at 92% 4%, rgba(28, 58, 46, 0.55), transparent 48%),
    linear-gradient(rgba(28, 58, 46, 0.26) 1px, transparent 1px),
    linear-gradient(90deg, rgba(28, 58, 46, 0.26) 1px, transparent 1px);
  background-size: auto, auto, 112px 112px, 112px 112px;
  background-repeat: no-repeat, no-repeat, repeat, repeat;
  color: var(--bone);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  word-break: break-word;
  overflow-wrap: anywhere;
}

::selection { background: var(--fluoro); color: var(--ink); }

:focus { outline: none; }

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

/* ---------- 4. Typography ---------- */
.display-1,
.display-2,
.h-section,
.h-sub,
.btn,
.brand__name,
.footer-col__title {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.display-1 {
  font-size: clamp(56px, 11vw, 132px);
  line-height: 0.94;
}

.display-2 {
  font-size: clamp(38px, 6.4vw, 74px);
  line-height: 0.98;
}

.h-section {
  font-size: clamp(28px, 4.4vw, 46px);
  line-height: 1.08;
  position: relative;
}

.h-sub {
  font-size: clamp(19px, 2vw, 24px);
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.lead {
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.75;
  color: rgba(242, 240, 230, 0.82);
  max-width: 38em;
}

.prose { max-width: 40em; }
.prose p { margin-bottom: 1.15em; color: rgba(242, 240, 230, 0.86); }
.prose p:last-child { margin-bottom: 0; }
.prose h2 { font-size: clamp(22px, 2.6vw, 30px); margin: 1.6em 0 0.6em; font-weight: 800; letter-spacing: -0.02em; }
.prose h3 { font-size: clamp(18px, 1.8vw, 22px); margin: 1.4em 0 0.5em; font-weight: 700; }
.prose ul { margin: 0 0 1.15em; padding-left: 0; }
.prose ul li { position: relative; padding-left: 20px; margin-bottom: 0.5em; color: rgba(242, 240, 230, 0.86); }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 9px;
  height: 2px;
  background: var(--volt);
  transform: rotate(var(--tilt));
}
.prose a { color: var(--fluoro); border-bottom: 1px solid rgba(198, 245, 66, 0.35); }
.prose a:hover { border-bottom-color: var(--fluoro); }
.prose blockquote {
  margin: 1.4em 0;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--clay);
  color: rgba(242, 240, 230, 0.9);
  font-size: 1.05em;
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  font-size: 1.1em;
  color: var(--fluoro);
}

.annotation {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--rock);
  letter-spacing: 0.03em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--rock);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--fluoro);
  transform: rotate(var(--tilt));
}

.h-section::before {
  content: "";
  display: block;
  width: 34px;
  height: 3px;
  margin-bottom: 14px;
  background: var(--fluoro);
  transform-origin: left center;
  transform: rotate(var(--tilt));
  transition: transform 0.45s cubic-bezier(0.2, 0.7, 0.3, 1);
}
.reveal-ready .h-section.reveal::before { transform: scaleX(0) rotate(var(--tilt)); }
.reveal-ready .h-section.reveal.is-visible::before { transform: scaleX(1) rotate(var(--tilt)); }

/* ---------- 5. Layout ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(40px, 6vw, 88px); }

.section--band {
  background: linear-gradient(180deg, rgba(15, 42, 32, 0.94), rgba(11, 15, 13, 0.62));
  border-block: 1px solid var(--moss);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: clamp(22px, 3vw, 42px);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--moss);
}

.rule {
  height: 1px;
  border: 0;
  background: var(--moss);
  margin-block: clamp(24px, 4vw, 48px);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2.2vw, 28px);
}
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }

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

/* ---------- 6. Buttons ---------- */
.btn {
  --btn-bg: var(--volt);
  --btn-fg: #170703;
  --btn-line: transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.02em;
  background: var(--btn-bg);
  color: var(--btn-fg);
  box-shadow: inset 0 0 0 1px var(--btn-line);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
  transition: transform 0.16s ease, background-color 0.16s ease,
              color 0.16s ease, box-shadow 0.16s ease;
}
.btn:hover { transform: translateY(-2px); }

.btn--accent { --btn-bg: var(--fluoro); --btn-fg: var(--ink); }
.btn--primary { --btn-bg: var(--volt); --btn-fg: #170703; }
.btn--ghost {
  --btn-bg: rgba(28, 58, 46, 0.5);
  --btn-fg: var(--bone);
  --btn-line: var(--moss);
}
.btn--ghost:hover { --btn-fg: var(--fluoro); --btn-line: var(--fluoro); }
.btn--sm { padding: 9px 15px; font-size: 13.5px; }
.btn--block { width: 100%; }

.link-quiet {
  font-size: 14px;
  color: rgba(242, 240, 230, 0.76);
  padding: 8px 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}
.link-quiet:hover { color: var(--fluoro); border-bottom-color: var(--fluoro); }

/* ---------- 7. Breadcrumbs ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-block: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--rock);
}
.breadcrumbs__item { display: inline-flex; align-items: center; gap: 10px; }
.breadcrumbs__item:not(:last-child)::after {
  content: "/";
  color: #3d5a4c;
}
.breadcrumbs a { transition: color 0.16s ease; }
.breadcrumbs a:hover { color: var(--fluoro); }
.breadcrumbs [aria-current="page"] { color: var(--bone); }

/* ---------- 8. Header ---------- */
.skip-link {
  position: absolute;
  left: 14px;
  top: -70px;
  z-index: 99;
  padding: 10px 18px;
  background: var(--fluoro);
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: top 0.18s ease;
}
.skip-link:focus,
.skip-link:focus-visible { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(180deg, rgba(11, 15, 13, 0.99), rgba(11, 15, 13, 0.94));
  border-bottom: 1px solid var(--moss);
  backdrop-filter: blur(8px);
  transition: border-color 0.2s ease;
}
.site-header.is-condensed {
  border-bottom-color: rgba(198, 245, 66, 0.28);
}

/* 顶部细数据条 */
.header-rail {
  background: var(--pitch);
  border-bottom: 1px solid rgba(28, 58, 46, 0.9);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--rock);
}
.header-rail__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 30px;
  padding-block: 5px;
  transition: min-height 0.24s ease, padding 0.24s ease;
}
.rail-text {
  display: flex;
  align-items: center;
  gap: 9px;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.rail-dot {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  background: var(--fluoro);
  box-shadow: 0 0 0 3px rgba(198, 245, 66, 0.16);
}
.rail-meter {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  white-space: nowrap;
}
.rail-meter__label { color: var(--rock); }
.rail-meter__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  font-weight: 700;
  color: var(--fluoro);
}

/* 品牌 + 左右分置导航 */
.header-main__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(12px, 3vw, 40px);
  padding-block: clamp(10px, 1.5vw, 16px);
  transition: padding 0.24s ease;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  flex: 0 0 auto;
}
.brand__mark {
  flex: 0 0 auto;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  background: var(--fluoro);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 23px;
  font-weight: 800;
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 13px), calc(100% - 13px) 100%, 0 100%);
  transition: width 0.24s ease, height 0.24s ease, font-size 0.24s ease;
}
.brand__text { display: flex; flex-direction: column; min-width: 0; line-height: 1.15; }
.brand__name {
  font-size: 20px;
  font-weight: 800;
  color: var(--bone);
  white-space: nowrap;
}
.brand__tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--rock);
  white-space: nowrap;
}

.header-right {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 22px);
  min-width: 0;
}

.primary-nav { min-width: 0; }

.nav-list {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-list__link {
  display: inline-block;
  padding: 9px 13px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
  white-space: nowrap;
  color: rgba(242, 240, 230, 0.78);
  background: rgba(28, 58, 46, 0.5);
  box-shadow: inset 0 0 0 1px var(--moss);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: color 0.18s ease, background-color 0.18s ease,
              box-shadow 0.18s ease, padding 0.24s ease;
}
.nav-list__link:hover {
  color: var(--bone);
  box-shadow: inset 0 0 0 1px var(--volt);
}
.nav-list__link[aria-current="page"] {
  color: var(--fluoro);
  background: rgba(198, 245, 66, 0.1);
  box-shadow: inset 0 0 0 1px var(--fluoro);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 14px;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--bone);
  box-shadow: inset 0 0 0 1px var(--moss);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: color 0.16s ease, box-shadow 0.16s ease;
}
.nav-toggle__bars {
  position: relative;
  width: 18px;
  height: 2px;
  background: currentColor;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }
.nav-toggle[aria-expanded="true"] {
  color: var(--fluoro);
  box-shadow: inset 0 0 0 1px var(--fluoro);
}

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  pointer-events: none;
  background: transparent;
}
.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--volt), var(--fluoro));
}

/* 滚动收缩态 */
.site-header.is-condensed .rail-text { display: none; }
.site-header.is-condensed .header-rail__inner { min-height: 24px; padding-block: 2px; }
.site-header.is-condensed .header-main__inner { padding-block: 8px; }
.site-header.is-condensed .brand__mark { width: 36px; height: 36px; font-size: 18px; }
.site-header.is-condensed .brand__tag { display: none; }
.site-header.is-condensed .nav-list__link { padding: 7px 11px; }

/* ---------- 9. Footer ---------- */
.site-footer {
  margin-top: clamp(48px, 8vw, 120px);
  background: linear-gradient(180deg, var(--pitch), #0A1A14 62%, var(--ink));
  border-top: 1px solid var(--moss);
  color: var(--bone);
}

.footer-accent {
  display: block;
  height: 5px;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 58%);
  background: linear-gradient(
    90deg,
    var(--fluoro) 0 26%,
    var(--volt) 26% 44%,
    var(--card-y) 44% 56%,
    var(--card-r) 56% 62%,
    var(--moss) 62% 100%
  );
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: clamp(24px, 4vw, 56px);
  padding-block: clamp(40px, 6vw, 76px);
}

.footer-brand { min-width: 0; }
.brand--footer { align-items: center; }
.brand--footer .brand__mark { width: 40px; height: 40px; font-size: 20px; }
.footer-brand__note {
  margin-top: 18px;
  max-width: 32em;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(242, 240, 230, 0.72);
}
.footer-region {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--rock);
}

.footer-col__title {
  position: relative;
  margin-bottom: 16px;
  padding-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--rock);
}
.footer-col__title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 26px;
  height: 2px;
  background: var(--fluoro);
  transform: rotate(var(--tilt));
}

.footer-list { display: flex; flex-direction: column; gap: 2px; }

.footer-link {
  display: inline-flex;
  align-items: center;
  padding: 5px 0;
  font-size: 14.5px;
  color: rgba(242, 240, 230, 0.76);
  transition: color 0.16s ease;
}
.footer-link::before {
  content: "";
  display: inline-block;
  width: 0;
  height: 1px;
  margin-right: 0;
  background: var(--fluoro);
  vertical-align: middle;
  transition: width 0.18s ease, margin-right 0.18s ease;
}
.footer-link:hover { color: var(--fluoro); }
.footer-link:hover::before { width: 12px; margin-right: 8px; }

.footer-text {
  display: inline-block;
  padding: 5px 0;
  font-size: 14.5px;
  color: var(--rock);
}

.footer-contact { padding-bottom: clamp(24px, 3vw, 40px); }

.contact-card { max-width: 720px; }
.contact-card__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--fluoro);
  margin-bottom: 12px;
}
.contact-card__list { display: flex; flex-direction: column; gap: 4px; }
.contact-card__list li {
  font-size: 14.5px;
  color: rgba(242, 240, 230, 0.86);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}
.contact-card__note {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--rock);
}
.contact-card .btn { margin-top: 18px; }

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 24px;
  padding-block: 20px 28px;
  border-top: 1px solid var(--moss);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--rock);
}
.footer-base__links { display: flex; flex-wrap: wrap; gap: 18px; }
.footer-base__links a { transition: color 0.16s ease; }
.footer-base__links a:hover { color: var(--fluoro); }
.footer-base__icp { color: var(--rock); }

/* ---------- 10. Base components ---------- */
.cut-card {
  position: relative;
  padding: clamp(16px, 2vw, 26px);
  background: var(--pitch);
  box-shadow: inset 0 0 0 1px var(--moss);
  clip-path: polygon(
    0 0,
    calc(100% - var(--cut)) 0,
    100% var(--cut),
    100% 100%,
    var(--cut) 100%,
    0 calc(100% - var(--cut))
  );
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.cut-card:hover {
  transform: translateY(-2px);
  box-shadow: inset 0 0 0 1px var(--volt);
}

.card-corner {
  position: relative;
  padding-top: calc(clamp(16px, 2vw, 26px) + 10px);
}
.card-corner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 22px;
  height: 22px;
  background: linear-gradient(135deg, var(--card-y) 0 50%, var(--card-r) 50% 100%);
  clip-path: polygon(0 0, 100% 0, 0 100%);
}

.data-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--bone);
  background: rgba(28, 58, 46, 0.92);
  box-shadow: inset 0 0 0 1px var(--moss);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
}
.data-chip[data-tone="fluoro"] { color: var(--fluoro); }
.data-chip[data-tone="orange"] { color: var(--volt); }
.data-chip[data-tone="yellow"] { color: var(--card-y); }
.data-chip[data-tone="red"] { color: var(--card-r); }

.stat-block {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: rgba(15, 42, 32, 0.72);
  box-shadow: inset 0 0 0 1px var(--moss);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}
.stat-block__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--fluoro);
}
.stat-block__label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--rock);
}

.timeline {
  position: relative;
  padding-left: 28px;
  border-left: 1px solid var(--moss);
}
.timeline__item { position: relative; padding-bottom: 28px; }
.timeline__item:last-child { padding-bottom: 0; }
.timeline__item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  box-shadow: inset 0 0 0 2px var(--volt);
}

.media-frame {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #0F2A20 0%, #0B0F0D 58%, #1C3A2E 100%);
  box-shadow: inset 0 0 0 1px var(--moss);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(198, 245, 66, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(198, 245, 66, 0.07) 1px, transparent 1px);
  background-size: 32px 32px;
}
.media-frame--21x9 { aspect-ratio: 21 / 9; }
.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--3x2  { aspect-ratio: 3 / 2; }
.media-frame--4x3  { aspect-ratio: 4 / 3; }
.media-frame--1x1  { aspect-ratio: 1 / 1; }
.media-frame--tilt { transform: rotate(-1.4deg); }
.media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame__layer {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 16px 18px 14px;
  background: linear-gradient(180deg, transparent, rgba(11, 15, 13, 0.9));
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--bone);
}

.toc { position: sticky; top: 112px; font-size: 14px; }
.toc__title {
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--rock);
}
.toc__list {
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--moss);
}
.toc-link {
  display: block;
  margin-left: -1px;
  padding: 7px 0 7px 14px;
  border-left: 2px solid transparent;
  font-size: 13.5px;
  color: rgba(242, 240, 230, 0.7);
  transition: color 0.16s ease, border-color 0.16s ease;
}
.toc-link:hover { color: var(--bone); }
.toc-link.is-active {
  color: var(--fluoro);
  border-left-color: var(--fluoro);
}

.accordion { display: flex; flex-direction: column; gap: 10px; }
.accordion__item {
  background: rgba(15, 42, 32, 0.62);
  box-shadow: inset 0 0 0 1px var(--moss);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  transition: box-shadow 0.2s ease;
}
.accordion__item[data-open] { box-shadow: inset 0 0 0 1px rgba(198, 245, 66, 0.55); }
.accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 18px 20px;
  text-align: left;
  font-family: var(--font-display);
  font-size: clamp(17px, 1.6vw, 21px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--bone);
  transition: color 0.16s ease;
}
.accordion__trigger::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--volt);
}
.accordion__item[data-open] .accordion__trigger { color: var(--fluoro); }
.accordion__item[data-open] .accordion__trigger::after { content: "–"; }
.accordion__panel {
  display: none;
  padding: 0 20px 20px;
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(242, 240, 230, 0.84);
  max-width: 40em;
}
.accordion__item[data-open] .accordion__panel { display: block; }

.card-toggle__body {
  display: none;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid rgba(138, 143, 134, 0.35);
}
[data-card-toggle][data-open] .card-toggle__body { display: block; }
[data-card-toggle][data-open] { box-shadow: inset 0 0 0 1px var(--fluoro); }

.back-to-top {
  position: fixed;
  right: clamp(14px, 3vw, 34px);
  bottom: clamp(14px, 3vw, 34px);
  z-index: 70;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--pitch);
  color: var(--fluoro);
  font-size: 18px;
  line-height: 1;
  box-shadow: inset 0 0 0 1px var(--moss), 0 12px 28px rgba(0, 0, 0, 0.55);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.2s ease, transform 0.2s ease,
              visibility 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.back-to-top:hover { background: var(--fluoro); color: var(--ink); }

/* 进场显现 */
.reveal { transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.2, 0.7, 0.3, 1); }
.reveal-ready .reveal { opacity: 0; transform: translateY(14px); }
.reveal-ready .reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 11. Responsive ---------- */
@media (max-width: 1240px) {
  .nav-list__link { padding: 8px 11px; font-size: 13.5px; }
}

@media (max-width: 1080px) {
  .nav-toggle { display: inline-flex; }
  .link-quiet { display: none; }

  .primary-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    max-height: calc(100vh - 96px);
    overflow-y: auto;
    background: var(--ink);
    border-top: 1px solid var(--moss);
    border-bottom: 1px solid var(--moss);
    box-shadow: 0 26px 60px rgba(0, 0, 0, 0.65);
  }
  .primary-nav[data-open] { display: block; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px clamp(16px, 4vw, 44px) 20px;
  }
  .nav-list__link {
    display: block;
    padding: 15px 2px;
    font-size: 17px;
    background: transparent;
    box-shadow: none;
    clip-path: none;
    border-bottom: 1px solid rgba(28, 58, 46, 0.8);
  }
  .nav-list__link:hover { background: rgba(28, 58, 46, 0.4); }
  .nav-list__link[aria-current="page"] {
    box-shadow: none;
    background: transparent;
    border-bottom-color: var(--fluoro);
  }

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

@media (max-width: 900px) {
  body { font-size: 16.5px; }
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9 { grid-column: 1 / -1; }
  .toc { position: static; }
}

@media (max-width: 720px) {
  .brand__tag { display: none; }
  .brand__mark { width: 40px; height: 40px; font-size: 20px; }
  .header-main__inner { gap: 10px; }
  .btn--sm { padding: 8px 12px; font-size: 12.5px; }
  .footer-base { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
  .header-rail__inner { font-size: 11px; }
  .rail-meter__label { display: none; }
  .contact-card__list li { font-size: 13.5px; }
}

/* ---------- 12. Motion preferences ---------- */
@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;
    scroll-behavior: auto !important;
  }

  .reveal-ready .reveal { opacity: 1; transform: none; }
  .reveal-ready .h-section.reveal::before { transform: rotate(var(--tilt)); }
  .btn:hover,
  .cut-card:hover { transform: none; }
  .scroll-progress { display: none; }
}