/* ============================================================
   星空赛场 · 共享站点样式 /assets/site.css
   夜航星图 × 赛场仪表盘：左轨道 + 右框景，锐利直角与精密细线
   ============================================================ */

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

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

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

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

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

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

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

:root {
  --ink: #070C18;
  --orbit: #101A30;
  --orbit-deep: #0B1425;
  --orbit-soft: #0A1120;
  --silver: #D7DEEA;
  --mist: #8E9AB2;
  --orange: #FF6A2A;
  --orange-soft: #FF824D;
  --cyan: #35E0C2;
  --signal: #F4C95D;
  --cream: #EFE4CE;
  --clay: #C9523F;
  --line: rgba(215, 222, 234, 0.16);
  --line-soft: rgba(215, 222, 234, 0.08);
  --rail: 104px;
  --wrap: 1360px;
  --font-display: "Oswald", "Barlow Condensed", "Arial Narrow", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  padding-left: var(--rail);
  background:
    radial-gradient(circle at 86% -8%, rgba(53, 224, 194, 0.07), transparent 46%),
    radial-gradient(circle at 10% 4%, rgba(255, 106, 42, 0.06), transparent 42%),
    var(--ink);
  color: var(--silver);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: 0.01em;
  color: var(--silver);
}

h1 { font-size: clamp(32px, 4.4vw, 64px); }
h2 { font-size: clamp(24px, 2.8vw, 40px); }
h3 { font-size: clamp(19px, 1.9vw, 28px); }

p { max-width: 74ch; }

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

::selection { background: rgba(255, 106, 42, 0.35); color: #fff; }

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

#main-content { scroll-margin-top: 24px; }

/* ---------- 跳转入口 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  padding: 11px 18px;
  background: var(--orange);
  color: #0A0F1C;
  font: 700 12px/1 var(--font-mono);
  letter-spacing: 0.08em;
  border-radius: 1px;
  transform: translateY(-180%);
  transition: transform 0.2s ease;
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 左轨道头部 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail);
  z-index: 100;
  display: flex;
  flex-direction: column;
  padding: 18px 0 16px;
  background: linear-gradient(180deg, #0B1322 0%, var(--orbit) 42%, #091020 100%);
  border-right: 1px solid var(--line);
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 1px;
  height: 96px;
  background: linear-gradient(180deg, var(--orange), transparent);
  pointer-events: none;
}

.site-header::after {
  content: "";
  position: absolute;
  top: 0;
  right: -1px;
  bottom: 0;
  width: 7px;
  background-image: repeating-linear-gradient(180deg, var(--line) 0 1px, transparent 1px 16px);
  opacity: 0.55;
  pointer-events: none;
}

/* 品牌区 */
.rail-brand {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 0 10px 16px;
  border-bottom: 1px solid var(--line-soft);
}

.brand-mark {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
}

.brand-glyph {
  position: relative;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--orange);
  color: var(--orange);
  font: 700 16px/1 var(--font-display);
  letter-spacing: 0;
  background: rgba(255, 106, 42, 0.07);
}

.brand-glyph::after {
  content: "";
  position: absolute;
  right: -4px;
  bottom: -4px;
  width: 4px;
  height: 4px;
  background: var(--cyan);
}

.brand-name {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--cream);
  white-space: nowrap;
}

.brand-sub {
  font: 400 9px/1.65 var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--mist);
  max-width: 78px;
}

.rail-version {
  margin-top: 2px;
  font: 400 9px/1 var(--font-mono);
  letter-spacing: 0.1em;
  color: var(--mist);
  text-transform: uppercase;
}

/* 移动目录按钮（桌面隐藏） */
.nav-toggle { display: none; }
.nav-toggle-glyph { display: none; }

/* 轨道导航 */
.rail-nav {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding: 12px 0;
  scrollbar-width: thin;
}

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

.rail-link {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 10px 10px 16px;
  border-left: 2px solid transparent;
  color: var(--mist);
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.rail-link::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--line-soft);
}

.rail-link:hover {
  color: var(--silver);
  background: rgba(215, 222, 234, 0.04);
}

.rail-index {
  font: 400 10px/1 var(--font-mono);
  letter-spacing: 0.1em;
  color: var(--mist);
  transition: color 0.2s ease;
}

.rail-label {
  font: 600 13px/1.35 var(--font-body);
  letter-spacing: 0.03em;
}

.rail-link[aria-current="page"] {
  color: var(--cream);
  border-left-color: var(--orange);
  background: linear-gradient(90deg, rgba(255, 106, 42, 0.16), transparent 92%);
}

.rail-link[aria-current="page"] .rail-index { color: var(--orange); }

.rail-link[aria-current="page"]::before { background: rgba(255, 106, 42, 0.5); }

/* 轨道底部：语言 / CTA / 观测进度 */
.rail-meta {
  flex: 0 0 auto;
  margin-top: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 14px 10px 0;
  border-top: 1px solid var(--line-soft);
}

.rail-utility {
  font: 400 9px/1 var(--font-mono);
  letter-spacing: 0.14em;
  color: var(--mist);
  text-transform: uppercase;
}

.rail-cta {
  display: block;
  width: 100%;
  padding: 10px 4px;
  text-align: center;
  background: var(--orange);
  color: #0A0F1C;
  font: 700 11px/1.32 var(--font-body);
  letter-spacing: 0.02em;
  border-radius: 1px;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  transition: background-color 0.2s ease;
}

.rail-cta:hover { background: var(--orange-soft); }

.rail-progress {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  width: 100%;
}

.rail-progress-track {
  position: relative;
  display: block;
  width: 2px;
  height: 92px;
  background: var(--line);
  overflow: hidden;
}

.rail-progress-fill {
  position: absolute;
  inset: 0;
  display: block;
  background: linear-gradient(180deg, var(--cyan), var(--orange));
  transform-origin: top center;
  transform: scaleY(0);
  transition: transform 0.14s linear;
}

.rail-progress-value {
  font: 400 10px/1 var(--font-mono);
  letter-spacing: 0.1em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

/* ---------- 页脚：轨道末端档案条 ---------- */
.site-footer {
  position: relative;
  background: linear-gradient(180deg, #0A1120 0%, var(--ink) 72%);
  border-top: 1px solid var(--line);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 72px;
  height: 2px;
  background: var(--orange);
}

.site-footer::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 40%;
  height: 100%;
  background-image:
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px),
    linear-gradient(180deg, var(--line-soft) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.5;
  pointer-events: none;
}

.footer-grid {
  position: relative;
  z-index: 1;
  width: min(100% - 48px, var(--wrap));
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 44px 32px;
  padding: 56px 0 44px;
}

.footer-brand { min-width: 0; }

.footer-mark {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--cream);
  line-height: 1;
}

.footer-summary {
  margin-top: 16px;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

.footer-contact-list {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-contact-list li {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 8px;
  font: 400 12px/1.7 var(--font-mono);
  letter-spacing: 0.02em;
  color: var(--mist);
  word-break: break-word;
}

.footer-contact-key {
  color: var(--orange);
  letter-spacing: 0.1em;
}

.footer-col { min-width: 0; }

.footer-col-title {
  padding-bottom: 12px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line-soft);
  font: 400 11px/1 var(--font-mono);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  display: inline-block;
  font-size: 14px;
  color: var(--silver);
  transition: color 0.2s ease;
}

.footer-links a:hover { color: var(--orange); }

.footer-contact-line {
  font-size: 13px;
  line-height: 1.85;
  color: var(--mist);
  margin-bottom: 12px;
}

.footer-note {
  margin-bottom: 18px;
  padding-left: 10px;
  border-left: 2px solid var(--signal);
  font: 400 11px/1.75 var(--font-mono);
  letter-spacing: 0.02em;
  color: var(--signal);
}

.footer-legal {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line-soft);
}

.footer-legal-inner {
  width: min(100% - 48px, var(--wrap));
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 28px;
  padding: 18px 0 24px;
  font: 400 11px/1.6 var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--mist);
}

.footer-copy { color: var(--mist); }

.footer-icp { color: var(--mist); }

.footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.footer-legal-links a {
  color: var(--mist);
  transition: color 0.2s ease;
}

.footer-legal-links a:hover { color: var(--cyan); }

/* ---------- 通用布局 ---------- */
.content-wrap {
  width: min(100% - 48px, var(--wrap));
  margin-inline: auto;
}

.page-main {
  display: block;
  padding: 0 0 clamp(56px, 7vw, 104px);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 24px;
}

.grid__col { min-width: 0; }

.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

/* ---------- 面包屑 ---------- */
.breadcrumb {
  width: min(100% - 48px, var(--wrap));
  margin-inline: auto;
  padding: 18px 0;
  font: 400 11px/1.5 var(--font-mono);
  letter-spacing: 0.06em;
  color: var(--mist);
}

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

.breadcrumb-list li { display: inline-flex; align-items: center; gap: 8px; }

.breadcrumb-list li + li::before {
  content: "/";
  color: var(--line);
}

.breadcrumb-list a { color: var(--mist); transition: color 0.2s ease; }

.breadcrumb-list a:hover { color: var(--cyan); }

.breadcrumb-list [aria-current="page"] { color: var(--silver); }

/* ---------- 章节头与索引条 ---------- */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px 28px;
  padding-bottom: 14px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  font: 400 11px/1 var(--font-mono);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--orange);
}

.section-title { margin-top: 8px; }

.rule-label {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  padding: 10px 0;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  font: 400 11px/1.6 var(--font-mono);
  letter-spacing: 0.08em;
  color: var(--mist);
  text-transform: uppercase;
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--line);
  border-radius: 1px;
  font: 400 10px/1.5 var(--font-mono);
  letter-spacing: 0.08em;
  color: var(--mist);
  background: rgba(215, 222, 234, 0.03);
  white-space: nowrap;
}

.tag--orange { color: var(--orange); border-color: rgba(255, 106, 42, 0.45); background: rgba(255, 106, 42, 0.08); }
.tag--cyan { color: var(--cyan); border-color: rgba(53, 224, 194, 0.4); background: rgba(53, 224, 194, 0.07); }
.tag--signal { color: var(--signal); border-color: rgba(244, 201, 93, 0.4); background: rgba(244, 201, 93, 0.08); }
.tag--clay { color: var(--cream); border-color: var(--clay); background: var(--clay); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 1px;
  font: 600 13px/1.2 var(--font-body);
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn--primary {
  background: var(--orange);
  color: #0A0F1C;
}

.btn--primary:hover { background: var(--orange-soft); }

.btn--ghost {
  border-color: var(--line);
  color: var(--silver);
  background: transparent;
}

.btn--ghost:hover {
  border-color: var(--orange);
  color: var(--cream);
  background: rgba(255, 106, 42, 0.08);
}

/* ---------- 数字 ---------- */
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

/* ---------- 图片容器基础规则 ---------- */
.figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--orbit-deep);
}

.figure__media {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: linear-gradient(155deg, var(--orbit) 0%, #0A1222 100%);
}

.figure__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px),
    linear-gradient(180deg, var(--line-soft) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.55;
  pointer-events: none;
}

.figure__img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.figure__caption {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px 14px;
  padding: 10px 12px;
  border-top: 1px solid var(--line-soft);
  font: 400 11px/1.6 var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--mist);
}

.figure--wide .figure__media { aspect-ratio: 21 / 9; }

.figure--tall .figure__media { aspect-ratio: 4 / 5; }

/* ---------- 滚动显现协议 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* ---------- 响应式：轨道折叠 ---------- */
@media (min-width: 901px) and (max-width: 1180px) {
  :root { --rail: 88px; }
  .brand-name { font-size: 13px; letter-spacing: 0.1em; }
  .brand-sub { font-size: 8px; max-width: 66px; }
  .rail-label { font-size: 12px; }
  .rail-link { padding-left: 14px; }
}

@media (max-height: 760px) and (min-width: 901px) {
  .rail-progress-track { height: 56px; }
  .rail-utility { display: none; }
  .rail-version { display: none; }
  .brand-sub { display: none; }
  .rail-link { padding-top: 8px; padding-bottom: 8px; }
}

@media (max-width: 900px) {
  body { padding-left: 0; }

  .site-header {
    position: sticky;
    top: 0;
    left: 0;
    right: 0;
    bottom: auto;
    width: 100%;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
    padding: 10px 16px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    background: linear-gradient(180deg, #0B1322 0%, var(--orbit) 100%);
  }

  .site-header::before { display: none; }
  .site-header::after { display: none; }

  .rail-brand {
    flex: 1 1 auto;
    flex-direction: row;
    align-items: center;
    gap: 10px;
    padding: 0;
    border-bottom: 0;
    min-width: 0;
  }

  .brand-mark {
    flex-direction: row;
    align-items: center;
    gap: 9px;
    text-align: left;
  }

  .brand-glyph { width: 28px; height: 28px; font-size: 13px; flex: 0 0 auto; }
  .brand-glyph::after { right: -3px; bottom: -3px; }
  .brand-name { font-size: 14px; letter-spacing: 0.12em; }
  .brand-sub { display: none; }
  .rail-version { display: none; }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    flex: 0 0 auto;
    padding: 9px 12px;
    border: 1px solid var(--line);
    border-radius: 1px;
    color: var(--silver);
    font: 600 12px/1 var(--font-mono);
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: border-color 0.2s ease, color 0.2s ease;
  }

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

  .nav-toggle-glyph {
    display: flex;
    flex-direction: column;
    gap: 3px;
    width: 14px;
  }

  .nav-toggle-glyph span {
    display: block;
    width: 100%;
    height: 1px;
    background: currentColor;
    transition: transform 0.2s ease, opacity 0.2s ease;
  }

  .site-header[data-open] .nav-toggle { border-color: var(--orange); color: var(--orange); }
  .site-header[data-open] .nav-toggle-glyph span:nth-child(1) { transform: translateY(4px) rotate(45deg); }
  .site-header[data-open] .nav-toggle-glyph span:nth-child(2) { opacity: 0; }
  .site-header[data-open] .nav-toggle-glyph span:nth-child(3) { transform: translateY(-4px) rotate(-45deg); }

  .rail-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex: 0 0 auto;
    max-height: 72vh;
    overflow-y: auto;
    padding: 6px 0 14px;
    background: var(--orbit-deep);
    border-bottom: 1px solid var(--line);
    border-top: 1px solid var(--line-soft);
  }

  .site-header[data-open] .rail-nav { display: block; }

  .rail-nav-list { flex-direction: column; }

  .rail-link {
    flex-direction: row;
    align-items: baseline;
    gap: 10px;
    padding: 13px 20px;
    border-left: 2px solid transparent;
  }

  .rail-link::before { display: none; }
  .rail-index { font-size: 10px; }
  .rail-label { font-size: 15px; }

  .rail-meta { display: none; }

  .grid { grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 16px; }
  .span-4, .span-5, .span-6, .span-7, .span-8, .span-12 { grid-column: span 6; }

  .content-wrap,
  .breadcrumb,
  .footer-grid,
  .footer-legal-inner { width: calc(100% - 40px); }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 34px 24px;
    padding: 44px 0 34px;
  }
}

@media (max-width: 640px) {
  body { font-size: 15px; }

  .content-wrap,
  .breadcrumb,
  .footer-grid,
  .footer-legal-inner { width: calc(100% - 32px); }

  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
  .span-4, .span-5, .span-6, .span-7, .span-8, .span-12 { grid-column: span 2; }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 36px 0 28px;
  }

  .footer-mark { font-size: 22px; }
  .footer-summary { max-width: none; }

  .footer-legal-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 16px 0 22px;
  }

  .footer-legal-links { gap: 14px; }

  .section-head { align-items: flex-start; }
}

/* ---------- 动效可及性 ---------- */
@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;
  }

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

  .skip-link { transition: none; }
}