/* =========================================================
   星空体育 · 共享样式表  /assets/site.css
   结构：reset → 变量 → 排版 → 框架头 → 框架尾 → 基础件 → 响应式
   ========================================================= */

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

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

body, h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }

ul, ol { margin: 0; padding: 0; list-style: none; }

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

button, input, select, textarea { font: inherit; color: inherit; }

button { background: none; border: 0; padding: 0; cursor: pointer; }

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

[hidden] { display: none !important; }

/* ---------- 2. 变量 ---------- */
:root {
  --deep: #070B18;
  --hull: #0E1730;
  --panel: #16224A;
  --violet: #7A5CFF;
  --cyan: #35E1F0;
  --gold: #FFC24B;
  --star: #E9EEF9;
  --mist: #9AA7C7;
  --line: #2A3A63;
  --line-soft: rgba(42, 58, 99, 0.55);
  --press: #0E8F9C;
  --ink: #05101C;

  --rail: 88px;
  --topbar: 58px;
  --statusbar: 30px;

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- 3. 中文排版与画布 ---------- */
body {
  min-height: 100vh;
  overflow-x: hidden;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--star);
  background-color: var(--deep);
  background-image:
    radial-gradient(900px 480px at 78% -8%, rgba(122, 92, 255, 0.18), transparent 70%),
    radial-gradient(700px 420px at 4% 16%, rgba(53, 225, 240, 0.10), transparent 72%),
    linear-gradient(rgba(42, 58, 99, 0.20) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 58, 99, 0.20) 1px, transparent 1px);
  background-size: auto, auto, 96px 96px, 96px 96px;
  padding-left: var(--rail);
  padding-top: var(--topbar);
  padding-bottom: var(--statusbar);
}

p, li { line-height: 1.8; }

::selection { background: rgba(53, 225, 240, 0.28); color: #FFFFFF; }

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

/* ---------- 4. 页头框架 ---------- */
.site-header {
  position: relative;
  z-index: 130;
}

.skip-link {
  position: fixed;
  left: 12px;
  top: -90px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--cyan);
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  border-radius: 2px;
  transition: top 0.18s var(--ease);
}

.skip-link:focus {
  top: 12px;
  outline: 2px solid var(--star);
  outline-offset: 2px;
}

/* --- 4.1 左侧导轨 --- */
.frame-rail {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--rail);
  z-index: 120;
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, #0B1226 0%, var(--hull) 58%, #0A1024 100%);
  border-right: 1px solid var(--line);
}

.rail-corner {
  flex: 0 0 auto;
  height: var(--topbar);
  display: grid;
  place-items: center;
  border-bottom: 1px solid var(--line);
  background: radial-gradient(60px 40px at 50% 50%, rgba(122, 92, 255, 0.22), transparent 70%);
}

.rail-mark { width: 38px; height: 38px; }

.rail-ring { fill: none; stroke: var(--line); stroke-width: 1; }
.rail-ring--inner { stroke: var(--violet); opacity: 0.75; }

.rail-trace {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 1;
  stroke-dasharray: 90;
  stroke-dashoffset: 90;
  animation: rail-trace 850ms var(--ease) 120ms forwards;
}

@keyframes rail-trace {
  to { stroke-dashoffset: 0; }
}

.rail-node--a { fill: var(--gold); }
.rail-node--b { fill: var(--cyan); }
.rail-node--c { fill: var(--violet); }

.rail-head {
  display: none;
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--mist);
}

.frame-nav {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 10px 0;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.frame-nav::-webkit-scrollbar { width: 0; height: 0; }

.frame-nav-list { display: flex; flex-direction: column; }

.frame-nav-link {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 12px 4px;
  color: var(--mist);
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.nav-num {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--mist);
  opacity: 0.7;
}

.nav-label {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.frame-nav-link:hover {
  color: var(--star);
  background: rgba(53, 225, 240, 0.07);
}

.frame-nav-link:hover .nav-num { opacity: 1; color: var(--cyan); }

.frame-nav-link:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: -3px;
  color: var(--star);
}

.frame-nav-link[aria-current="page"] {
  color: var(--star);
  background: linear-gradient(180deg, rgba(122, 92, 255, 0.22), rgba(122, 92, 255, 0.04));
  box-shadow: inset 0 0 0 1px rgba(122, 92, 255, 0.55);
}

.frame-nav-link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(53, 225, 240, 0.85);
}

.frame-nav-link[aria-current="page"] .nav-num { color: var(--gold); opacity: 1; }

.rail-foot {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 14px 0 16px;
  border-top: 1px solid var(--line);
}

.rail-foot-label {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.26em;
  color: var(--mist);
}

.rail-foot-year {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.06em;
}

/* --- 4.2 顶部横框 --- */
.frame-top {
  position: fixed;
  left: var(--rail);
  right: 0;
  top: 0;
  height: var(--topbar);
  z-index: 110;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 22px;
  background: rgba(9, 14, 32, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.brand-lockup {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--star);
}

.brand-mark { width: 26px; height: 26px; flex: 0 0 auto; }

.mark-axis { stroke: var(--line); stroke-width: 1; }
.mark-axis--h { stroke: rgba(53, 225, 240, 0.45); }
.mark-ring { fill: none; stroke: var(--violet); stroke-width: 1; }
.mark-core { fill: var(--gold); }

.brand-lockup:hover .brand-name { color: var(--cyan); }

.brand-word { display: flex; flex-direction: column; line-height: 1.15; }

.brand-name {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.16em;
  transition: color 0.2s var(--ease);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.frame-search {
  margin-left: auto;
  flex: 0 1 380px;
  min-width: 0;
  max-width: 380px;
  height: 34px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(22, 34, 74, 0.5);
  color: var(--mist);
  font-size: 13px;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.frame-search:hover {
  border-color: var(--violet);
  background: rgba(22, 34, 74, 0.85);
  color: var(--star);
}

.frame-search:focus-visible {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 0 1px rgba(53, 225, 240, 0.5);
  color: var(--star);
}

.search-icon {
  position: relative;
  flex: 0 0 auto;
  width: 12px;
  height: 12px;
  border: 1px solid currentColor;
  border-radius: 50%;
}

.search-icon::after {
  content: "";
  position: absolute;
  right: -4px;
  bottom: -3px;
  width: 5px;
  height: 1px;
  background: currentColor;
  transform: rotate(45deg);
}

.search-text {
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: 0.04em;
}

.nav-toggle {
  display: none;
  flex: 0 0 auto;
  align-items: center;
  gap: 8px;
  height: 34px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--mist);
  font-size: 12px;
  letter-spacing: 0.16em;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

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

.nav-toggle[aria-expanded="true"] {
  border-color: var(--cyan);
  color: var(--star);
  background: rgba(53, 225, 240, 0.1);
}

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 18px;
  height: 12px;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: currentColor;
}

.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { bottom: 0; }

.nav-toggle-text { white-space: nowrap; }

.frame-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 1px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--violet), var(--cyan) 55%, var(--gold));
}

/* --- 4.3 底部状态带 --- */
.frame-status {
  position: fixed;
  left: var(--rail);
  right: 0;
  bottom: 0;
  height: var(--statusbar);
  z-index: 110;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 22px;
  background: #0A1024;
  border-top: 1px solid var(--line);
  color: var(--mist);
  font-size: 12px;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease);
}

.frame-status:hover { background: #0D1530; color: var(--star); }

.status-dot {
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px rgba(53, 225, 240, 0.9);
  animation: status-pulse 2.6s var(--ease) infinite;
}

@keyframes status-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.status-version { font-family: var(--font-mono); color: var(--star); letter-spacing: 0.04em; }
.status-count { color: var(--mist); }
.status-cta { margin-left: auto; color: var(--gold); letter-spacing: 0.1em; }

/* --- 4.4 抽屉遮罩 --- */
.frame-scrim {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(4, 7, 18, 0.72);
  cursor: pointer;
}

/* ---------- 5. 页脚 ---------- */
.site-footer {
  position: relative;
  background: linear-gradient(180deg, #0A1024 0%, var(--deep) 100%);
  border-top: 1px solid var(--line);
  padding: 56px 0 0;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 62%;
  height: 1px;
  background: linear-gradient(90deg, var(--violet), var(--cyan) 58%, transparent);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) 2fr;
  gap: 44px;
  padding-bottom: 40px;
}

.footer-brand-name {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.2em;
}

.footer-brand-sub {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.footer-brand-note {
  margin-top: 14px;
  max-width: 26em;
  font-size: 13px;
  color: var(--mist);
  line-height: 1.75;
}

.back-to-index {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  padding-bottom: 4px;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  border-bottom: 1px solid rgba(53, 225, 240, 0.4);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.back-to-index::before {
  content: "←";
  font-family: var(--font-mono);
}

.back-to-index:hover { color: var(--star); border-color: var(--star); }

.footer-index {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

.footer-col-title {
  position: relative;
  padding-bottom: 10px;
  margin-bottom: 12px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--star);
  border-bottom: 1px solid var(--line-soft);
}

.footer-col-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 26px;
  height: 1px;
  background: var(--violet);
}

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

.footer-link {
  display: inline-block;
  padding: 5px 0;
  font-size: 14px;
  color: var(--mist);
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}

.footer-link:hover {
  color: var(--cyan);
  transform: translateX(3px);
}

.footer-contact {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px 28px;
  padding: 26px 0;
  border-top: 1px solid var(--line-soft);
}

.footer-contact-title {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.26em;
  color: var(--cyan);
}

.footer-contact-list {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px 28px;
}

.footer-contact-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 12px;
  border-left: 1px solid var(--line);
}

.footer-contact-key {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.footer-contact-val {
  font-size: 13px;
  color: var(--star);
  line-height: 1.7;
  word-break: break-word;
}

.footer-note {
  grid-column: 1 / -1;
  max-width: 62em;
  font-size: 12px;
  color: var(--mist);
  line-height: 1.75;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  padding: 18px 0 26px;
  border-top: 1px solid var(--line-soft);
  font-size: 12px;
  color: var(--mist);
}

.footer-copy { letter-spacing: 0.06em; }

.footer-legal {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.footer-legal .footer-link { padding: 0; font-size: 12px; }

.footer-legal-sep { color: var(--line); }

.footer-icp {
  margin-left: auto;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

/* ---------- 6. 页面基础件 ---------- */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 28px;
}

.section {
  position: relative;
  padding: 72px 0;
  border-bottom: 1px solid var(--line-soft);
}

.section--deep { background: var(--deep); }
.section--hull { background: var(--hull); }
.section--panel { background: var(--panel); }
.section--flush { border-bottom: 0; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--cyan);
}

.section-title {
  font-size: clamp(22px, 2.4vw, 32px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.04em;
}

.lede {
  max-width: 34em;
  font-size: 17px;
  line-height: 1.8;
  color: var(--mist);
}

.prose {
  max-width: 38em;
  font-size: 17px;
  line-height: 1.85;
  color: #D5DEF2;
}

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

.prose h2 {
  margin: 1.6em 0 0.6em;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--star);
}

.prose ul { margin: 1em 0; }

.prose li {
  position: relative;
  padding-left: 1.2em;
}

.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 8px;
  height: 1px;
  background: var(--gold);
}

.grid { display: grid; gap: 24px; }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.panel {
  position: relative;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: linear-gradient(160deg, rgba(22, 34, 74, 0.94), rgba(14, 23, 48, 0.94));
}

.panel--float {
  box-shadow: 0 28px 52px -34px rgba(0, 0, 0, 0.95);
}

.num,
.stat-figure {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.02em;
}

.stat-figure {
  display: block;
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.05;
}

.stat-label {
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.index-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.index-row {
  display: grid;
  grid-template-columns: 64px 1fr auto;
  gap: 16px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
  color: var(--star);
  transition: background-color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.index-row:hover { background: rgba(53, 225, 240, 0.05); padding-left: 10px; }

.index-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  color: var(--gold);
  text-align: right;
}

.index-title { font-size: 16px; font-weight: 600; }

.index-meta {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mist);
}

.tag {
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 2px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.tag--cyan { color: var(--cyan); border-color: rgba(53, 225, 240, 0.45); }
.tag--gold { color: var(--gold); border-color: rgba(255, 194, 75, 0.45); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 44px;
  padding: 0 22px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(22, 34, 74, 0.6);
  color: var(--star);
  font-size: 14px;
  letter-spacing: 0.12em;
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease), color 0.2s var(--ease);
}

.btn:hover { border-color: var(--violet); background: rgba(122, 92, 255, 0.18); }

.btn--primary {
  border-color: transparent;
  background: linear-gradient(120deg, var(--violet), #5B45D6);
  color: #F5F7FF;
}

.btn--primary:hover { background: linear-gradient(120deg, #8B6FFF, #6A53E8); }

.btn--ghost { background: transparent; border-color: var(--cyan); color: var(--cyan); }
.btn--ghost:hover { background: rgba(53, 225, 240, 0.12); color: var(--star); }

.btn--gold { background: transparent; border-color: rgba(255, 194, 75, 0.5); color: var(--gold); }
.btn--gold:hover { background: rgba(255, 194, 75, 0.12); color: var(--star); border-color: var(--gold); }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.breadcrumb a { color: var(--mist); transition: color 0.2s var(--ease); }
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb-sep { color: var(--line); }
.breadcrumb [aria-current="page"] { color: var(--star); }

.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: linear-gradient(150deg, #101B3C, var(--deep));
}

.media-frame > img,
.media-frame > svg,
.media-frame > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(7, 11, 24, 0.08) 0%, rgba(7, 11, 24, 0.72) 100%);
}

.media-frame[data-placeholder]::before {
  content: attr(data-placeholder);
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 16px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--portrait { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.disclosure {
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(14, 23, 48, 0.7);
}

.disclosure + .disclosure { margin-top: 10px; }

.disclosure > summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--star);
  list-style: none;
}

.disclosure > summary::-webkit-details-marker { display: none; }

.disclosure > summary::before {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-right: 1px solid var(--cyan);
  border-bottom: 1px solid var(--cyan);
  transform: rotate(-45deg);
  transition: transform 0.24s var(--ease);
}

.disclosure[open] > summary::before { transform: rotate(45deg); }

.disclosure[open] > summary { color: var(--cyan); border-bottom: 1px solid var(--line-soft); }

.disclosure-body { padding: 16px 20px 20px; color: #D5DEF2; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 7. 显现协议 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}

.js [data-reveal="shown"] {
  opacity: 1;
  transform: none;
}

/* ---------- 8. 响应式 ---------- */
@media (max-width: 1200px) {
  .footer-grid { grid-template-columns: minmax(220px, 1fr) 1.8fr; gap: 32px; }
}

@media (max-width: 1023px) {
  body {
    padding-left: 0;
  }

  .frame-rail {
    top: var(--topbar);
    bottom: var(--statusbar);
    width: min(320px, 86vw);
    transform: translateX(-101%);
    transition: transform 0.26s var(--ease);
    border-right: 1px solid var(--violet);
    box-shadow: 0 0 44px rgba(0, 0, 0, 0.65);
  }

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

  .rail-corner { display: none; }

  .rail-head {
    display: block;
    padding: 16px 22px 12px;
    border-bottom: 1px solid var(--line);
  }

  .frame-nav { padding: 6px 0 14px; }

  .frame-nav-link {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 14px;
    padding: 14px 22px;
    border-bottom: 1px solid var(--line-soft);
  }

  .nav-label { writing-mode: horizontal-tb; font-size: 16px; letter-spacing: 0.08em; }
  .nav-num { font-size: 12px; color: var(--gold); opacity: 0.85; }

  .frame-nav-link[aria-current="page"] { box-shadow: none; }

  .frame-nav-link[aria-current="page"]::before {
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
  }

  .rail-foot {
    flex-direction: row;
    justify-content: space-between;
    padding: 14px 22px;
  }

  .frame-top { left: 0; padding: 0 16px; gap: 12px; }
  .frame-status { left: 0; padding: 0 16px; font-size: 11px; }
  .status-count { display: none; }
  .nav-toggle { display: inline-flex; }
  .frame-search { flex: 1 1 auto; max-width: none; }

  body.nav-open { overflow: hidden; }

  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-index { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
  .footer-contact-list { grid-template-columns: 1fr 1fr; }
  .footer-contact { grid-template-columns: 1fr; }
}

@media (max-width: 767px) {
  body { font-size: 15.5px; }
  .container { padding: 0 18px; }
  .section { padding: 52px 0; }
  .grid { gap: 18px; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .footer-index { grid-template-columns: 1fr 1fr; }
  .footer-contact-list { grid-template-columns: 1fr; }
  .footer-icp { margin-left: 0; }
  .prose, .lede { font-size: 16px; }
  .index-row { grid-template-columns: 48px 1fr; }
  .index-meta { grid-column: 2; }
}

@media (max-width: 559px) {
  .brand-sub { display: none; }
  .frame-search { flex: 0 0 auto; width: 34px; max-width: 34px; justify-content: center; padding: 0; }
  .frame-search .search-text { display: none; }
  .nav-toggle-text { display: none; }
  .footer-index { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

@media (min-width: 900px) {
  body { background-attachment: fixed; }
}

/* ---------- 9. 动效降级 ---------- */
@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;
  }

  .rail-trace { stroke-dashoffset: 0; }
  .status-dot { animation: none; }
  .js [data-reveal] { opacity: 1; transform: none; transition: none; }
}