/* ============================================================
   /assets/site.css — 南宫体育 中文数据站 · 共享外壳
   夜间数据指挥台 / 档案系统 / 矿物色体系
   ============================================================ */

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

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

:root {
  /* 矿物与信号色 */
  --ink-950: #05130f;
  --ink-900: #071c16;
  --ink-800: #0b2a21;
  --line: #1d4a3a;
  --line-soft: rgba(29, 74, 58, 0.55);
  --mint: #5cffb1;
  --signal: #2fbf84;
  --amber: #ff9f43;
  --amber-hi: #ffb368;
  --clay: #c97755;
  --sand: #d9c9a3;
  --frost: #eaf6ef;
  --mist: #9db8ac;
  --focus: #b7ffe0;

  /* 字体 */
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --font-serif: "Noto Serif SC", "Songti SC", serif;

  /* 度量 */
  --shell: 1240px;
  --gutter: 16px;
  --radius: 6px;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 72px;
}

/* ---------- reset ---------- */

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--ink-900);
  background-image:
    radial-gradient(circle at 12% -4%, rgba(47, 191, 132, 0.12), transparent 46%),
    radial-gradient(circle at 88% 4%, rgba(255, 159, 67, 0.08), transparent 44%);
  background-repeat: no-repeat;
  background-attachment: fixed;
  color: var(--frost);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--frost);
}

p {
  margin: 0 0 1em;
}

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

figure, blockquote {
  margin: 0;
}

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

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

a {
  color: var(--mint);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

a:hover {
  color: var(--focus);
}

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

#main-content {
  display: block;
  scroll-margin-top: 128px;
}

#main-content:focus {
  outline: none;
}

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

/* ---------- 布局工具 ---------- */

.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.bento {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
  align-items: start;
}

.span-full { grid-column: 1 / -1; }
.span-3 { grid-column: span 3; }
.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-9 { grid-column: span 9; }
.span-12 { grid-column: 1 / -1; }

.rule {
  height: 1px;
  border: 0;
  margin: var(--space-4) 0;
  background: var(--line);
}

/* ---------- 跳转链接 ---------- */

.skip-link {
  position: absolute;
  left: 16px;
  top: -120px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: 0 0 var(--radius) var(--radius);
  background: var(--mint);
  color: var(--ink-900);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  transition: top 0.18s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 0;
  color: var(--ink-900);
  outline: 2px solid var(--ink-900);
  outline-offset: -4px;
}

/* ---------- 1. 头部 · 上层信息带 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
}

.header-meta {
  background: var(--ink-950);
  border-bottom: 1px solid var(--line-soft);
}

.header-meta__inner {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 38px;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.header-eyebrow {
  margin: 0;
  flex: 0 0 auto;
  padding-right: var(--space-2);
  border-right: 1px solid var(--line);
  color: var(--sand);
  letter-spacing: 0.16em;
  white-space: nowrap;
}

.header-statement {
  margin: 0;
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.header-update {
  margin: 0 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  color: var(--mint);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.status-dot {
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 3px rgba(92, 255, 177, 0.16);
  animation: status-pulse 2.4s var(--ease) infinite;
}

@keyframes status-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ---------- 2. 头部 · 主体带 ---------- */

.header-main {
  position: relative;
  background: rgba(7, 28, 22, 0.95);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.45);
}

.header-main__inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 68px;
}

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

.brand:hover {
  color: var(--frost);
}

.brand__mark {
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 4px;
  background-color: var(--ink-800);
  background-image:
    radial-gradient(circle at 50% 50%, transparent 4px, var(--mint) 4px, var(--mint) 5px, transparent 5px),
    linear-gradient(
      90deg,
      transparent calc(50% - 0.5px),
      rgba(92, 255, 177, 0.55) calc(50% - 0.5px),
      rgba(92, 255, 177, 0.55) calc(50% + 0.5px),
      transparent calc(50% + 0.5px)
    );
}

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

.brand__name {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.brand__sub {
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.header-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  flex: 1 1 auto;
  min-width: 0;
}

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

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.primary-nav__item {
  display: block;
}

.primary-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 10px 12px;
  border-radius: 4px;
  color: var(--mist);
  font-size: 14px;
  line-height: 1;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.primary-nav__link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  background: var(--mint);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s var(--ease);
}

.primary-nav__link:hover {
  color: var(--frost);
  background: rgba(92, 255, 177, 0.07);
}

.primary-nav__link:hover::after {
  transform: scaleX(0.45);
}

.primary-nav__index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: rgba(201, 119, 85, 0.9);
}

.primary-nav__label {
  white-space: nowrap;
}

.primary-nav__link[aria-current="page"] {
  color: var(--mint);
  background: rgba(92, 255, 177, 0.08);
}

.primary-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.02em;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease),
    border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.btn:active {
  transform: translateY(1px);
}

.btn--accent {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--ink-900);
}

.btn--accent:hover,
.btn--accent:focus-visible {
  background: var(--amber-hi);
  border-color: var(--amber-hi);
  color: var(--ink-900);
}

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

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--signal);
  background: rgba(92, 255, 177, 0.07);
  color: var(--mint);
}

.btn--mint {
  background: var(--mint);
  border-color: var(--mint);
  color: var(--ink-900);
}

.btn--mint:hover,
.btn--mint:focus-visible {
  background: var(--focus);
  border-color: var(--focus);
  color: var(--ink-900);
}

.btn--block {
  width: 100%;
}

/* ---------- 移动导航按钮 ---------- */

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  margin-left: auto;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: transparent;
  color: var(--frost);
  font-size: 13px;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--signal);
  color: var(--mint);
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 1px;
  background: currentColor;
  transition: background-color 0.2s var(--ease);
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  border-radius: 1px;
  background: currentColor;
  transition: transform 0.2s var(--ease), top 0.2s var(--ease);
}

.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  top: 0;
  transform: rotate(-45deg);
}

/* ---------- 页脚 ---------- */

.site-footer {
  margin-top: var(--space-6);
  background: var(--ink-950);
  border-top: 1px solid var(--line);
  color: var(--mist);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1.5fr 1.1fr;
  gap: var(--space-4);
  padding-block: var(--space-5);
}

.footer-brand__name {
  display: inline-block;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--frost);
}

.footer-brand__tagline {
  margin: 12px 0 0;
  max-width: 30ch;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

.footer-brand__meta {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--signal);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
}

.footer-col {
  min-width: 132px;
}

.footer-col__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sand);
}

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

.footer-link {
  display: inline-block;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--mist);
  transition: color 0.18s var(--ease);
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--mint);
}

.footer-contact__list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-contact__item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 13.5px;
}

.footer-contact__key {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--signal);
}

.footer-contact__value {
  color: var(--frost);
  word-break: break-word;
}

.footer-note {
  margin: 16px 0 0;
  max-width: 32ch;
  font-size: 12px;
  line-height: 1.75;
  color: rgba(157, 184, 172, 0.85);
}

.footer-bottom {
  border-top: 1px solid var(--line-soft);
}

.footer-bottom__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-block: 18px;
  font-size: 12px;
  color: rgba(157, 184, 172, 0.9);
}

.footer-copy {
  margin: 0;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-legal a {
  font-size: 12px;
  color: var(--mist);
}

.footer-legal a:hover,
.footer-legal a:focus-visible {
  color: var(--mint);
}

/* ---------- 面包屑 ---------- */

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

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

.breadcrumb__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.breadcrumb a {
  color: var(--mist);
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--mint);
}

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

/* ---------- 正文容器 ---------- */

.prose {
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--frost);
}

.prose p {
  margin: 0 0 1.15em;
}

.prose p:last-child {
  margin-bottom: 0;
}

.prose strong {
  color: var(--mint);
  font-weight: 600;
}

.prose h2 {
  margin: 40px 0 14px;
  font-size: 24px;
}

.prose h3 {
  margin: 32px 0 10px;
  font-size: 18px;
}

.prose ul,
.prose ol {
  margin: 0 0 1.15em;
  padding-left: 1.25em;
  list-style: disc;
}

.prose ol {
  list-style: decimal;
}

.prose li {
  margin-bottom: 6px;
}

.prose a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 面板 / 资料卡 ---------- */

.panel {
  padding: var(--space-3);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-800);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.28), 0 16px 32px -28px rgba(0, 0, 0, 0.95);
}

.panel--accent {
  border-left: 2px solid var(--mint);
}

/* ---------- 标签 ---------- */

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: rgba(29, 74, 58, 0.25);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
  white-space: nowrap;
}

.tag--mint {
  border-color: rgba(92, 255, 177, 0.4);
  background: rgba(92, 255, 177, 0.1);
  color: var(--mint);
}

.tag--amber {
  border-color: rgba(255, 159, 67, 0.4);
  background: rgba(255, 159, 67, 0.1);
  color: var(--amber);
}

.tag--clay {
  border-color: rgba(201, 119, 85, 0.45);
  background: rgba(201, 119, 85, 0.12);
  color: var(--clay);
}

.tag--sand {
  border-color: rgba(217, 201, 163, 0.35);
  background: rgba(217, 201, 163, 0.1);
  color: var(--sand);
}

/* ---------- 章节标题组 ---------- */

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  margin-bottom: var(--space-3);
}

.section-head__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--clay);
}

.section-head__title {
  margin: 0;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.section-head__note {
  margin: 0;
  flex: 1 1 240px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 响应式媒体容器（供页面阶段放置图形） ---------- */

.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--ink-800);
  background-image:
    linear-gradient(rgba(29, 74, 58, 0.5) 1px, transparent 1px),
    linear-gradient(90deg, rgba(29, 74, 58, 0.5) 1px, transparent 1px);
  background-size: 32px 32px;
}

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

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

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--sand);
  background: linear-gradient(to top, rgba(5, 19, 15, 0.94), rgba(5, 19, 15, 0));
}

/* ---------- 滚动进度条（JS 注入） ---------- */

.scroll-meter {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 120;
  height: 2px;
  background: rgba(29, 74, 58, 0.6);
  pointer-events: none;
}

.scroll-meter__fill {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--mint), var(--signal));
  transform: scaleX(0);
  transform-origin: left center;
}

/* ---------- 渐进显现 ---------- */

html.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.24s var(--ease), transform 0.24s var(--ease);
}

html.js [data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   响应式
   ============================================================ */

@media (max-width: 1080px) {
  .header-statement {
    display: none;
  }

  .primary-nav__link {
    padding: 10px 8px;
    font-size: 13px;
  }

  .header-main__inner {
    gap: 16px;
  }

  .header-actions .btn {
    padding: 0 14px;
    font-size: 13px;
  }
}

@media (max-width: 1024px) {
  .span-3,
  .span-4,
  .span-5 {
    grid-column: span 6;
  }

  .span-7,
  .span-8,
  .span-9 {
    grid-column: 1 / -1;
  }
}

@media (max-width: 960px) {
  .nav-toggle {
    display: inline-flex;
  }

  .header-main__inner {
    gap: 12px;
    min-height: 62px;
  }

  .header-panel {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px var(--gutter) 20px;
    background: var(--ink-950);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 24px 40px -32px rgba(0, 0, 0, 0.95);
  }

  .header-panel[data-open="true"] {
    display: flex;
  }

  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .primary-nav__link {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 10px;
    padding: 14px 8px;
    border-bottom: 1px solid var(--line-soft);
    border-radius: 0;
    font-size: 15px;
  }

  .primary-nav__link::after {
    display: none;
  }

  .primary-nav__link[aria-current="page"] {
    padding-left: 12px;
    border-left: 2px solid var(--mint);
    background: rgba(92, 255, 177, 0.09);
  }

  .header-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    padding-top: 16px;
  }

  .header-actions .btn {
    width: 100%;
    min-height: 46px;
    font-size: 14px;
  }

  .header-update {
    display: none;
  }
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3);
  }

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

  .footer-nav {
    gap: var(--space-4);
  }
}

@media (max-width: 700px) {
  .bento {
    grid-template-columns: minmax(0, 1fr);
  }

  .span-3,
  .span-4,
  .span-5,
  .span-6,
  .span-7,
  .span-8,
  .span-9,
  .span-12,
  .span-full {
    grid-column: 1 / -1;
  }

  .section-head__title {
    font-size: 20px;
  }
}

@media (max-width: 640px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-brand__tagline,
  .footer-note {
    max-width: none;
  }

  .footer-bottom__inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .header-eyebrow {
    border-right: 0;
    padding-right: 0;
    letter-spacing: 0.1em;
  }
}

/* ---------- 无障碍：减弱动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .status-dot {
    animation: none;
  }

  html.js [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
}