/* ===== 01 重置 ===== */
*,
*::before,
*::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { max-width: 100%; display: block; }
button { font: inherit; color: inherit; background: none; border: 0; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
[id] { scroll-margin-top: 130px; }

/* ===== 02 变量 ===== */
:root {
  --ink: #06110D;
  --bg: #0C2A21;
  --panel: #16473A;
  --panel-deep: #0F3A2E;
  --neon: #3FF2C8;
  --mist: #9BF6E0;
  --amber: #FF8B3D;
  --amber-soft: #FFC078;
  --paper: #EFF7F3;
  --muted: #8FA8A0;
  --violet: #7A5CFF;
  --line: rgba(155, 246, 224, 0.22);
  --line-strong: rgba(155, 246, 224, 0.45);
  --shadow-hard: 8px 8px 0 rgba(6, 17, 13, 0.55);
  --r: 4px;
  --r-pill: 999px;
  --wrap: 1220px;
  --gutter: clamp(16px, 4vw, 40px);
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-narrow: "Arial Narrow", "Helvetica Neue Condensed", "Roboto Condensed", var(--font-sans);
}

/* ===== 03 基底排版 ===== */
body {
  background-color: var(--bg);
  background-image:
    radial-gradient(920px 520px at 10% -8%, rgba(63, 242, 200, 0.10), transparent 62%),
    radial-gradient(760px 480px at 94% 2%, rgba(122, 92, 255, 0.10), transparent 60%),
    linear-gradient(180deg, #0C2A21 0%, #08211A 58%, #06110D 100%);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  min-height: 100vh;
  overflow-x: hidden;
}
h1 { font-size: clamp(34px, 6vw, 64px); line-height: 1.05; font-weight: 900; letter-spacing: -0.02em; }
h2 { font-size: clamp(26px, 4vw, 52px); line-height: 1.1; font-weight: 800; letter-spacing: -0.015em; }
h3 { font-size: clamp(19px, 2.2vw, 28px); line-height: 1.28; font-weight: 700; }
h4 { font-size: 16px; line-height: 1.4; font-weight: 800; letter-spacing: 0.02em; }
strong { font-weight: 800; color: var(--paper); }
::selection { background: var(--neon); color: var(--ink); }

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

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

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -80px;
  z-index: 200;
  padding: 12px 20px;
  background: var(--neon);
  color: var(--ink);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.06em;
  border: 3px solid var(--ink);
  border-radius: 0 0 8px 8px;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 0; }

.container { width: min(calc(100% - var(--gutter) * 2), var(--wrap)); margin-inline: auto; }
.footer-shell { width: min(calc(100% - var(--gutter) * 2), var(--wrap)); margin-inline: auto; }

.fig {
  font-family: var(--font-narrow);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  line-height: 1;
}

/* ===== 04 头部 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  color: var(--paper);
  background: linear-gradient(180deg, rgba(6, 17, 13, 0.97), rgba(9, 32, 25, 0.93));
  border-bottom: 4px solid var(--ink);
  box-shadow: 0 16px 36px rgba(6, 17, 13, 0.5);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.scroll-meter { height: 3px; background: rgba(155, 246, 224, 0.12); overflow: hidden; }
.scroll-meter-bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--neon), var(--mist) 55%, var(--amber));
  transition: transform 0.12s linear;
}
.header-shell { width: min(calc(100% - var(--gutter) * 2), var(--wrap)); margin-inline: auto; }
.header-main {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 22px);
  padding-block: 12px;
  transition: padding 0.25s ease;
}

.brand { display: flex; align-items: center; gap: 12px; flex: 0 0 auto; min-width: 0; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 44px; height: 44px;
  flex: 0 0 auto;
  background: linear-gradient(140deg, var(--neon), #2AD3AD);
  color: var(--ink);
  font-family: var(--font-narrow);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.06em;
  border: 3px solid var(--ink);
  border-radius: 14px 4px 14px 4px;
  box-shadow: 4px 4px 0 rgba(6, 17, 13, 0.7);
  transition: width 0.25s ease, height 0.25s ease, font-size 0.25s ease;
}
.brand-text { display: flex; flex-direction: column; min-width: 0; }
.brand-name { font-size: 16px; font-weight: 800; letter-spacing: 0.02em; white-space: nowrap; }
.brand-line {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  transition: opacity 0.2s ease, height 0.25s ease;
}

.site-nav { flex: 1 1 auto; display: flex; justify-content: center; min-width: 0; }
.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 5px;
  background: rgba(22, 71, 58, 0.55);
  border: 2px solid var(--line);
  border-radius: var(--r-pill);
}
.nav-link {
  position: relative;
  display: block;
  padding: 8px 16px;
  border-radius: var(--r-pill);
  font-size: 14px;
  font-weight: 600;
  color: var(--mist);
  white-space: nowrap;
  transition: color 0.2s ease, background-color 0.2s ease, padding 0.25s ease;
}
.nav-link:hover { color: var(--paper); background: rgba(63, 242, 200, 0.12); }
.nav-link[aria-current="page"] { color: var(--neon); background: rgba(63, 242, 200, 0.10); }
.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 16px; right: 16px; bottom: 2px;
  height: 2px;
  border-radius: 2px;
  background: var(--neon);
}

.header-search {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  border: 2px solid var(--line-strong);
  border-radius: var(--r-pill);
  color: var(--muted);
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease, padding 0.25s ease;
}
.header-search:hover { border-color: var(--neon); color: var(--mist); background: rgba(63, 242, 200, 0.08); }
.search-icon {
  position: relative;
  width: 13px; height: 13px;
  flex: 0 0 auto;
  border: 2px solid currentColor;
  border-radius: 50%;
}
.search-icon::after {
  content: "";
  position: absolute;
  right: -6px; bottom: -4px;
  width: 8px; height: 2px;
  background: currentColor;
  transform: rotate(45deg);
}
.search-text { font-size: 13px; letter-spacing: 0.04em; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 15px;
  background: rgba(22, 71, 58, 0.7);
  border: 2px solid var(--line-strong);
  border-radius: var(--r-pill);
  color: var(--mist);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.nav-toggle:hover { border-color: var(--neon); color: var(--neon); }
.nav-toggle-text { letter-spacing: 0.14em; }
.nav-toggle-bars { position: relative; display: block; width: 18px; height: 2px; background: currentColor; transition: background-color 0.2s ease; }
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px; height: 2px;
  background: currentColor;
  transition: transform 0.22s ease;
}
.nav-toggle-bars::before { top: -6px; }
.nav-toggle-bars::after { top: 6px; }
.site-header[data-open] .nav-toggle-bars { background: transparent; }
.site-header[data-open] .nav-toggle-bars::before { transform: translateY(6px) rotate(45deg); }
.site-header[data-open] .nav-toggle-bars::after { transform: translateY(-6px) rotate(-45deg); }

.index-band {
  display: flex;
  align-items: center;
  gap: 14px;
  max-height: 64px;
  padding-bottom: 11px;
  overflow: hidden;
  transition: max-height 0.28s ease, opacity 0.2s ease, padding 0.28s ease;
}
.index-tabs {
  flex: 0 0 auto;
  display: flex;
  gap: 4px;
  padding: 3px;
  background: rgba(6, 17, 13, 0.6);
  border: 2px solid var(--line);
  border-radius: var(--r-pill);
}
.index-tab {
  padding: 5px 12px;
  border-radius: var(--r-pill);
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease;
}
.index-tab:hover { color: var(--mist); }
.index-tab[aria-pressed="true"] { background: var(--neon); color: var(--ink); }
.index-track {
  flex: 1 1 auto;
  min-width: 0;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 18px, #000 calc(100% - 30px), transparent);
  mask-image: linear-gradient(90deg, transparent, #000 18px, #000 calc(100% - 30px), transparent);
}
.index-panel { display: flex; gap: 8px; overflow-x: auto; padding-block: 2px; scrollbar-width: none; }
.index-panel::-webkit-scrollbar { display: none; }
.index-panel[hidden] { display: none; }
.index-chip {
  flex: 0 0 auto;
  padding: 5px 12px;
  background: rgba(22, 71, 58, 0.5);
  border: 2px solid var(--line);
  border-radius: var(--r);
  color: var(--mist);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.index-chip:hover { background: var(--neon); border-color: var(--ink); color: var(--ink); }

.site-header[data-condensed] .header-main { padding-block: 7px; }
.site-header[data-condensed] .brand-mark { width: 36px; height: 36px; font-size: 14px; }
.site-header[data-condensed] .brand-line { opacity: 0; height: 0; }
.site-header[data-condensed] .nav-link { padding: 6px 13px; }
.site-header[data-condensed] .header-search { padding: 6px 12px; }
.site-header[data-condensed] .header-search .search-text { display: none; }
.site-header[data-condensed] .index-band { max-height: 0; opacity: 0; padding-bottom: 0; }

/* ===== 05 页脚 ===== */
.site-footer {
  margin-top: clamp(48px, 8vw, 110px);
  background: linear-gradient(180deg, #08211A, #06110D 62%);
  border-top: 4px solid var(--ink);
  color: var(--paper);
}
.footer-top { padding-block: clamp(40px, 6vw, 72px); }
.footer-grid {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  grid-template-columns: repeat(12, minmax(0, 1fr));
}
.footer-block { grid-column: span 12; min-width: 0; }
.footer-mark {
  font-size: 20px;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--paper);
}
.footer-mark::before {
  content: "";
  display: inline-block;
  width: 10px; height: 10px;
  margin-right: 10px;
  background: var(--neon);
  border-radius: 2px;
  transform: translateY(-2px);
}
.footer-desc { margin-top: 12px; font-size: 14px; line-height: 1.8; color: var(--muted); }
.footer-note { margin-top: 12px; font-size: 12.5px; line-height: 1.75; color: var(--muted); }
.footer-title {
  margin-bottom: 14px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--neon);
}
.footer-list { display: grid; gap: 9px; }
.footer-link {
  width: fit-content;
  font-size: 14px;
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.footer-link:hover { color: var(--neon); border-bottom-color: var(--neon); }
.footer-list--contact { gap: 12px; }
.contact-row { display: grid; gap: 2px; }
.contact-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}
.contact-value { font-size: 15px; font-weight: 600; color: var(--paper); font-variant-numeric: tabular-nums; }

.footer-subscribe {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 26px;
  margin-top: clamp(24px, 3vw, 40px);
  padding: clamp(18px, 2.4vw, 26px);
  background: linear-gradient(120deg, rgba(22, 71, 58, 0.78), rgba(12, 42, 33, 0.6));
  border: 3px solid var(--line);
  border-left: 6px solid var(--amber);
  border-radius: var(--r);
  box-shadow: var(--shadow-hard);
}
.subscribe-body { flex: 1 1 320px; min-width: 0; }
.subscribe-title { font-size: 17px; font-weight: 800; letter-spacing: 0.02em; color: var(--paper); }
.subscribe-note { margin-top: 6px; font-size: 14px; line-height: 1.75; color: var(--muted); }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 24px;
  padding-block: 22px;
  border-top: 2px solid var(--line);
  font-size: 13px;
  color: var(--muted);
}
.footer-legal { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.footer-legal-link { color: var(--mist); transition: color 0.2s ease; }
.footer-legal-link:hover { color: var(--neon); }
.footer-copy { font-variant-numeric: tabular-nums; }

/* ===== 06 按钮与标签 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border: 3px solid var(--ink);
  border-radius: var(--r-pill);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.04em;
  cursor: pointer;
  box-shadow: 4px 4px 0 rgba(6, 17, 13, 0.7);
  transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.2s ease, color 0.2s ease;
}
.btn:hover { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 rgba(6, 17, 13, 0.75); }
.btn--primary { background: var(--neon); color: var(--ink); }
.btn--primary:hover { background: var(--mist); }
.btn--amber { background: var(--amber); color: var(--ink); }
.btn--ghost {
  background: transparent;
  color: var(--mist);
  border-color: var(--line-strong);
  box-shadow: none;
}
.btn--ghost:hover { background: var(--neon); border-color: var(--ink); color: var(--ink); box-shadow: none; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: 2px solid var(--line-strong);
  border-radius: 3px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
}
.tag--neon { background: var(--neon); border-color: var(--ink); color: var(--ink); }
.tag--amber { background: var(--amber); border-color: var(--ink); color: var(--ink); }
.tag--violet { background: var(--violet); border-color: var(--ink); color: var(--paper); }
.tag--ghost { background: transparent; color: var(--muted); }

/* ===== 07 版式区块 ===== */
.section { padding-block: clamp(44px, 6vw, 88px); }
.section--tight { padding-block: clamp(28px, 4vw, 52px); }
.section--wide { width: 100%; }
.section-head { display: grid; gap: 14px; max-width: 74ch; margin-bottom: clamp(22px, 3vw, 40px); }
.section-num {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-narrow);
  font-size: 12px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.24em;
  color: var(--neon);
}
.section-num::after { content: ""; width: 64px; height: 3px; border-radius: 2px; background: var(--neon); }
.kicker {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--neon);
}
.page-hero { padding-block: clamp(34px, 5vw, 64px) clamp(20px, 3vw, 38px); }
.page-title { font-size: clamp(32px, 5.4vw, 64px); font-weight: 900; line-height: 1.05; letter-spacing: -0.02em; }
.lede { max-width: 64ch; font-size: clamp(16px, 1.6vw, 19px); line-height: 1.8; color: var(--mist); }
.prose { max-width: 68ch; font-size: 16px; line-height: 1.8; color: #DCEBE4; }
.prose p + p { margin-top: 1.2em; }
.prose h3 { margin-top: 1.8em; margin-bottom: 0.5em; }
.prose ul, .prose ol { display: grid; gap: 8px; margin-top: 1em; }
.prose li { position: relative; padding-left: 20px; }
.prose li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.72em;
  width: 8px; height: 8px;
  background: var(--neon);
  border-radius: 1px;
}

.band {
  padding-block: clamp(26px, 3.4vw, 44px);
  background: linear-gradient(90deg, rgba(6, 17, 13, 0.95), rgba(12, 42, 33, 0.95));
  border-block: 4px solid var(--ink);
}

/* ===== 08 栅格与卡片 ===== */
.grid {
  display: grid;
  gap: clamp(14px, 2vw, 26px);
  grid-template-columns: repeat(12, minmax(0, 1fr));
}
.grid > * { grid-column: span 12; min-width: 0; }

.tac-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, rgba(22, 71, 58, 0.85), rgba(12, 42, 33, 0.92));
  border: 4px solid var(--ink);
  border-radius: var(--r);
  box-shadow: var(--shadow-hard);
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}
.tac-card::after {
  content: "";
  position: absolute;
  right: -4px; bottom: -4px;
  width: 16px; height: 16px;
  background: var(--neon);
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}
.tac-card:hover { transform: translate(-3px, -3px); border-color: var(--neon); box-shadow: 10px 10px 0 rgba(6, 17, 13, 0.6); }
.tac-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  background: rgba(6, 17, 13, 0.35);
  border-bottom: 3px solid var(--ink);
}
.tac-card__title { font-size: 15px; font-weight: 800; letter-spacing: 0.04em; color: var(--paper); }
.tac-card__meta { font-size: 11px; font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); }
.tac-card__body { display: grid; gap: 12px; padding: 16px; }
.tac-card__foot {
  padding: 12px 16px;
  border-top: 2px dashed var(--line);
  font-size: 12px;
  color: var(--muted);
}

.data-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-block: 9px;
  border-bottom: 1px dashed var(--line);
}
.data-row:last-child { border-bottom: 0; }
.data-row__key { font-size: 13px; color: var(--muted); }
.data-row__val {
  font-family: var(--font-narrow);
  font-size: 17px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: var(--paper);
}
.data-row__val--neon { color: var(--neon); }
.data-row__val--up { color: var(--amber); }
.data-row__val--violet { color: var(--violet); }

.stat { display: grid; gap: 4px; }
.stat__value {
  font-family: var(--font-narrow);
  font-size: clamp(30px, 4.4vw, 52px);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--neon);
}
.stat__label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ===== 09 面包屑与图片容器 ===== */
.breadcrumb { margin-bottom: clamp(18px, 2.4vw, 30px); }
.breadcrumb__list { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: 12.5px; color: var(--muted); }
.breadcrumb__item { display: flex; align-items: center; gap: 8px; }
.breadcrumb__item + .breadcrumb__item::before { content: "/"; color: var(--line-strong); }
.breadcrumb__link { color: var(--mist); transition: color 0.2s ease; }
.breadcrumb__link:hover { color: var(--neon); }
.breadcrumb__item[aria-current="page"] { color: var(--paper); font-weight: 700; }

.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 4px solid var(--ink);
  border-radius: var(--r);
  background: linear-gradient(140deg, #0F3A2E, #06110D);
  box-shadow: var(--shadow-hard);
}
.media-frame img { width: 100%; height: 100%; object-fit: cover; }
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(115deg, rgba(63, 242, 200, 0.10) 0 1px, transparent 1px 22px),
    radial-gradient(120% 90% at 86% 8%, rgba(63, 242, 200, 0.16), transparent 62%);
  mix-blend-mode: screen;
  pointer-events: none;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame__caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ===== 10 返回顶部与动效 ===== */
.to-top {
  position: fixed;
  right: clamp(14px, 2.4vw, 28px);
  bottom: clamp(14px, 2.4vw, 28px);
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 11px 16px;
  background: var(--neon);
  color: var(--ink);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  border: 3px solid var(--ink);
  border-radius: var(--r);
  cursor: pointer;
  box-shadow: 5px 5px 0 rgba(6, 17, 13, 0.65);
  transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.2s ease;
}
.to-top:hover { background: var(--mist); transform: translate(-2px, -2px); box-shadow: 7px 7px 0 rgba(6, 17, 13, 0.7); }
.to-top[hidden] { display: none; }
.to-top__arrow {
  width: 0; height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-bottom: 7px solid currentColor;
}
.to-top__text { font-size: 11px; }

.reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.42s ease, transform 0.42s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

/* ===== 11 响应式 ===== */
@media (max-width: 960px) {
  .header-main { position: relative; flex-wrap: wrap; }
  .nav-toggle { display: inline-flex; order: 2; margin-left: auto; }
  .header-search { order: 3; padding: 8px 12px; }
  .header-search .search-text { display: none; }
  .brand-line { display: none; }
  .site-nav {
    order: 4;
    display: none;
    position: absolute;
    left: 0; right: 0;
    top: calc(100% + 10px);
    z-index: 90;
    padding: 10px;
    background: linear-gradient(180deg, #0B241C, #06110D);
    border: 4px solid var(--ink);
    border-radius: 14px;
    box-shadow: var(--shadow-hard);
  }
  .site-header[data-open] .site-nav { display: block; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 4px; padding: 0; background: none; border: 0; border-radius: 0; }
  .nav-link { padding: 12px 14px; border-radius: 8px; font-size: 15px; }
  .nav-link[aria-current="page"]::after { left: 14px; right: auto; width: 22px; bottom: 6px; }
  .index-band { flex-direction: column; align-items: stretch; gap: 8px; max-height: 120px; padding-bottom: 12px; }
  .index-track { width: 100%; }
}

@media (max-width: 620px) {
  .brand-mark { width: 38px; height: 38px; font-size: 14px; border-width: 2px; }
  .brand-name { font-size: 14px; }
  .header-search { display: none; }
  .footer-bottom { flex-direction: column; }
}

@media (min-width: 760px) {
  .footer-brand { grid-column: span 5; }
  .footer-nav { grid-column: span 3; }
  .footer-contact { grid-column: span 4; }
}

@media (min-width: 860px) {
  .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; }
}

@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;
  }
  .reveal { opacity: 1; transform: none; }
  .btn:hover, .tac-card:hover, .to-top:hover { transform: none; }
  .site-header[data-condensed] .index-band { max-height: 64px; opacity: 1; }
}