/* ==========================================================================
   塔台 TowerNav — 设计系统
   概念：航空运控美学。亮色主题 =「航图纸面」（航空地图的冷白纸底 + 航图蓝
   墨 + 航图品红），暗色主题 =「夜航塔台」（夜间管制室的深蓝夜色 + 信号琥
   珀）。信息屏（Board）无论何种主题始终是暗面琥珀字 —— 屏幕本身就是发光体。
   ========================================================================== */

/* ---- 设计令牌 ---------------------------------------------------------- */
:root {
  /* 航图纸面（亮色，默认） */
  --c-bg: #f4f5f0;
  --c-surface: #fcfcfa;
  --c-surface-2: #eef0e9;
  --c-ink: #1b2837;
  --c-ink-2: #4d5d6c;
  --c-ink-3: #75828e;
  --c-line: #d7dcd2;
  --c-line-strong: #b9c1b4;
  --c-accent: #a03465;      /* 航图品红：航空地图上 VOR 罗盘的品红 */
  --c-accent-soft: #f4e3ec;
  --c-blue: #2b5c8c;        /* 航图蓝：链接与次级强调 */
  --c-blue-soft: #e3ebf3;
  --c-amber: #9c6a08;       /* 信号琥珀（亮色下加深保证对比度） */
  --c-amber-soft: #f5ead2;
  --c-good: #34683f;
  --c-good-soft: #e2eee2;
  --c-risk: #9d3b34;
  --c-risk-soft: #f4e4e1;

  /* 信息屏：主题无关的发光暗面 */
  --board-bg: #101820;
  --board-bg-2: #161f29;
  --board-line: #263341;
  --board-amber: #f0b64c;
  --board-green: #7fd0a2;
  --board-dim: #8b99a5;
  --board-bright: #e9eef2;

  /* 字体 */
  --font-sans: -apple-system, 'Segoe UI', 'PingFang SC', 'HarmonyOS Sans SC', 'MiSans',
    'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans CJK SC', sans-serif;
  --font-mono: ui-monospace, 'SF Mono', 'Cascadia Code', 'JetBrains Mono', Consolas,
    'Liberation Mono', 'PingFang SC', 'Microsoft YaHei', monospace;

  /* 心电图线遮罩（monitor 语义的分割线与呼号短横共用；stroke 用不透明色，作 alpha 遮罩） */
  --ecg-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 24' preserveAspectRatio='none'%3E%3Cpath d='M0 12 H86 l5 -2 l4 2 l5 0 l3 -6 l4 11 l4 -7 l4 2 H200' fill='none' stroke='%23000' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  --ecg-mask-sm: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 44 20' preserveAspectRatio='none'%3E%3Cpath d='M0 10 H15 l3 -1 l2 1 l3 0 l2 -5 l3 9 l3 -6 l2 2 H44' fill='none' stroke='%23000' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");

  /* 版式 */
  --measure: 42em;            /* 中文正文行长 */
  --shell: 76rem;             /* 页面外壳宽度 */
  --radius: 6px;
  --radius-lg: 10px;

  /* 动效 */
  --ease: cubic-bezier(0.2, 0.6, 0.2, 1);
  --t-fast: 140ms;
  --t-med: 240ms;

  color-scheme: light;
}

/* 夜航塔台（暗色） */
:root[data-theme='dark'] {
  --c-bg: #0d141c;
  --c-surface: #141d27;
  --c-surface-2: #1a2530;
  --c-ink: #e5eaee;
  --c-ink-2: #a2aeb9;
  --c-ink-3: #71808d;
  --c-line: #253240;
  --c-line-strong: #354555;
  --c-accent: #d883ab;
  --c-accent-soft: #35202b;
  --c-blue: #82b1dc;
  --c-blue-soft: #1b2a3a;
  --c-amber: #e8b559;
  --c-amber-soft: #322815;
  --c-good: #8cc79e;
  --c-good-soft: #1c2b21;
  --c-risk: #de8d84;
  --c-risk-soft: #33201e;
  color-scheme: dark;
}

/* 未手动选择主题时跟随系统 */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --c-bg: #0d141c;
    --c-surface: #141d27;
    --c-surface-2: #1a2530;
    --c-ink: #e5eaee;
    --c-ink-2: #a2aeb9;
    --c-ink-3: #71808d;
    --c-line: #253240;
    --c-line-strong: #354555;
    --c-accent: #d883ab;
    --c-accent-soft: #35202b;
    --c-blue: #82b1dc;
    --c-blue-soft: #1b2a3a;
    --c-amber: #e8b559;
    --c-amber-soft: #322815;
    --c-good: #8cc79e;
    --c-good-soft: #1c2b21;
    --c-risk: #de8d84;
    --c-risk-soft: #33201e;
    color-scheme: dark;
  }
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--c-ink);
  background-color: var(--c-bg);
  /* 航图网格：极淡的经纬底纹，纸面质感 */
  background-image:
    linear-gradient(var(--c-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-line) 1px, transparent 1px);
  background-size: 56px 56px;
  background-attachment: fixed;
  text-rendering: optimizeLegibility;
}

@media (max-width: 48rem) {
  body {
    background-image: none; /* 移动端去网格，省渲染 */
  }
}

h1, h2, h3, h4 {
  line-height: 1.35;
  letter-spacing: 0.01em;
  color: var(--c-ink);
  font-weight: 650;
  margin: 0 0 0.6em;
}

h1 { font-size: clamp(1.65rem, 1.2rem + 2vw, 2.35rem); }
h2 { font-size: clamp(1.3rem, 1.1rem + 1vw, 1.6rem); margin-top: 2.2em; }
h3 { font-size: 1.15rem; margin-top: 1.8em; }

p { margin: 0 0 1em; }

a {
  color: var(--c-blue);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--c-blue) 40%, transparent);
  text-underline-offset: 0.2em;
  transition: color var(--t-fast) var(--ease), text-decoration-color var(--t-fast) var(--ease);
}

a:hover {
  color: var(--c-accent);
  text-decoration-color: currentColor;
}

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

img { max-width: 100%; height: auto; }

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--c-surface-2);
  border: 1px solid var(--c-line);
  border-radius: 4px;
  padding: 0.1em 0.35em;
}

pre {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.6;
  background: var(--board-bg);
  color: var(--board-bright);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  overflow-x: auto;
}

pre code { background: none; border: none; padding: 0; color: inherit; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  line-height: 1.55;
}

th, td {
  text-align: left;
  padding: 0.55em 0.8em;
  border-bottom: 1px solid var(--c-line);
  vertical-align: top;
}

th {
  font-size: 0.8rem;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  color: var(--c-ink-2);
  border-bottom: 2px solid var(--c-line-strong);
  white-space: nowrap;
}

hr {
  border: none;
  height: 4px;
  margin: 2.5rem 0;
  /* 跑道中线：断续标线作为分隔符 */
  background: repeating-linear-gradient(90deg, var(--c-line-strong) 0 24px, transparent 24px 40px);
}

::selection {
  background: var(--c-amber-soft);
  color: var(--c-ink);
}

/* ---- 外壳与通用布局 ------------------------------------------------------ */
.shell {
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2.5rem);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 100;
  background: var(--c-ink);
  color: var(--c-bg);
  padding: 0.5rem 1rem;
}

.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

/* ---- 呼号（eyebrow）与元信息 --------------------------------------------- */
.callsign {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--c-accent);
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
}

/* 呼号前的迷你心电图：遮罩定义线形，背景提供颜色+扫描高亮（主题自适应） */
.callsign::before {
  content: '';
  width: 2.1em;
  height: 1em;
  flex: none;
  background:
    linear-gradient(90deg, transparent 0 40%, currentColor 50%, transparent 60% 100%),
    color-mix(in srgb, currentColor 30%, transparent);
  background-size: 220% 100%, 100% 100%;
  background-repeat: no-repeat, no-repeat;
  -webkit-mask: var(--ecg-mask-sm) no-repeat center / 100% 100%;
  mask: var(--ecg-mask-sm) no-repeat center / 100% 100%;
  animation: ecg-sweep 4.2s linear infinite;
}

.meta-line {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--c-ink-3);
  letter-spacing: 0.04em;
}

/* ---- 状态与标签 ---------------------------------------------------------- */
.chip {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  line-height: 1;
  padding: 0.35em 0.6em;
  border-radius: 999px;
  border: 1px solid var(--c-line-strong);
  color: var(--c-ink-2);
  background: var(--c-surface);
  white-space: nowrap;
}

.chip--amber { color: var(--c-amber); border-color: color-mix(in srgb, var(--c-amber) 45%, transparent); background: var(--c-amber-soft); }
.chip--good { color: var(--c-good); border-color: color-mix(in srgb, var(--c-good) 45%, transparent); background: var(--c-good-soft); }
.chip--risk { color: var(--c-risk); border-color: color-mix(in srgb, var(--c-risk) 45%, transparent); background: var(--c-risk-soft); }
.chip--blue { color: var(--c-blue); border-color: color-mix(in srgb, var(--c-blue) 45%, transparent); background: var(--c-blue-soft); }
.chip--accent { color: var(--c-accent); border-color: color-mix(in srgb, var(--c-accent) 45%, transparent); background: var(--c-accent-soft); }

/* ---- 卡片 ---------------------------------------------------------------- */
.card {
  display: block;
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.25rem;
  color: inherit;
  text-decoration: none;
  transition: border-color var(--t-med) var(--ease), transform var(--t-med) var(--ease),
    box-shadow var(--t-med) var(--ease);
}

a.card:hover {
  color: inherit;
  border-color: var(--c-accent);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px -8px color-mix(in srgb, var(--c-ink) 25%, transparent);
}

.card h3, .card h2 { margin-top: 0; }

/* ---- 提示框 --------------------------------------------------------------- */
.notice {
  border: 1px solid var(--c-line-strong);
  border-left: 4px solid var(--c-amber);
  background: var(--c-surface);
  border-radius: var(--radius);
  padding: 0.9rem 1.1rem;
  margin: 1.4rem 0;
  font-size: 0.94rem;
}

.notice--risk { border-left-color: var(--c-risk); }
.notice--good { border-left-color: var(--c-good); }
.notice > :last-child { margin-bottom: 0; }
.notice-label {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--c-ink-3);
  display: block;
  margin-bottom: 0.3em;
}

/* ---- 正文排版（文章页） --------------------------------------------------- */
.prose {
  max-width: var(--measure);
}

.prose h2 {
  padding-top: 0.4em;
  border-top: 1px solid var(--c-line);
}

.prose ul, .prose ol { padding-left: 1.4em; margin: 0 0 1.2em; }
.prose li { margin-bottom: 0.4em; }
.prose li::marker { color: var(--c-accent); font-family: var(--font-mono); }

.prose blockquote {
  margin: 1.4em 0;
  padding: 0.2em 0 0.2em 1.1em;
  border-left: 3px solid var(--c-accent);
  color: var(--c-ink-2);
}

.prose table { display: block; overflow-x: auto; }

.prose strong { color: var(--c-ink); }

/* 标题锚点 */
.prose h2 > a.anchor, .prose h3 > a.anchor {
  color: inherit;
  text-decoration: none;
}
.prose h2 > a.anchor:hover::after, .prose h3 > a.anchor:hover::after {
  content: ' #';
  color: var(--c-accent);
}

/* ---- 信息屏（签名元素：始终暗面琥珀字） ------------------------------------ */
.board {
  background: var(--board-bg);
  border: 1px solid var(--board-line);
  border-radius: var(--radius-lg);
  color: var(--board-bright);
  overflow: hidden;
}

.board-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.7rem 1.1rem;
  border-bottom: 1px solid var(--board-line);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--board-dim);
  text-transform: uppercase;
}

.board-head .live {
  color: var(--board-green);
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
}

.board-head .live::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  animation: pulse 2.4s var(--ease) infinite;
}

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

.board-row {
  display: grid;
  grid-template-columns: 5.5rem 1fr auto;
  gap: 1rem;
  align-items: baseline;
  padding: 0.78rem 1.1rem;
  border-bottom: 1px solid var(--board-line);
  color: inherit;
  text-decoration: none;
  font-size: 0.95rem;
  transition: background var(--t-fast) var(--ease);
}

.board-row:last-child { border-bottom: none; }

a.board-row:hover {
  background: var(--board-bg-2);
  color: inherit;
}

a.board-row:hover .board-title { color: var(--board-amber); }

.board-code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--board-amber);
}

.board-title {
  color: var(--board-bright);
  font-weight: 500;
  transition: color var(--t-fast) var(--ease);
}

.board-status {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--board-green);
  text-transform: uppercase;
}

.board-status--dim { color: var(--board-dim); }

@media (max-width: 40rem) {
  .board-row { grid-template-columns: 4.2rem 1fr; }
  .board-status { display: none; }
}

/* ---- 网格工具 ------------------------------------------------------------- */
.grid {
  display: grid;
  gap: 1rem;
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 64rem) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 40rem) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}

/* ---- 按钮 ---------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  padding: 0.6em 1.2em;
  border-radius: var(--radius);
  border: 1px solid var(--c-ink);
  background: var(--c-ink);
  color: var(--c-bg);
  text-decoration: none;
  cursor: pointer;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease);
}

.btn:hover { background: var(--c-accent); border-color: var(--c-accent); color: #fff; }

.btn--ghost {
  background: transparent;
  color: var(--c-ink);
}

.btn--ghost:hover { background: var(--c-surface-2); color: var(--c-ink); border-color: var(--c-ink); }

/* ---- 页面进入 -------------------------------------------------------------- */
@media (prefers-reduced-motion: no-preference) {
  main {
    animation: rise 0.45s var(--ease) both;
  }
  @keyframes rise {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: none; }
  }
}

/* ---- 降低动效 --------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}

/* ---- 打印 ------------------------------------------------------------------ */
@media print {
  body { background: #fff; }
  header.site-header, footer.site-footer, .no-print { display: none !important; }
}

/* ==========================================================================
   布局与组件（原 .astro 组件样式，现集中管理）
   ========================================================================== */

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

/* ---- Header ---- */
.site-header { background: var(--c-surface); border-bottom: 1px solid var(--c-line); }
.systems-bar { background: var(--board-bg); color: var(--board-dim); font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.12em; }
.systems-inner { display: flex; align-items: center; gap: 1.5rem; padding-block: 0.35rem; }
.sys-date { margin-left: auto; }
.theme-toggle { display: inline-flex; align-items: center; gap: 0.4em; background: none; border: none; color: var(--board-amber); font: inherit; letter-spacing: inherit; cursor: pointer; padding: 0.1em 0.3em; }
.main-bar { display: flex; align-items: center; gap: 2rem; padding-block: 0.9rem; }
.brand { display: inline-flex; align-items: center; gap: 0.6rem; text-decoration: none; color: var(--c-ink); }
.brand:hover { color: var(--c-accent); }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-zh { font-size: 1.25rem; font-weight: 700; letter-spacing: 0.28em; }
.brand-en { font-family: var(--font-mono); font-size: 0.6rem; letter-spacing: 0.34em; color: var(--c-ink-3); }
.primary-nav ul { list-style: none; display: flex; gap: 0.2rem; margin: 0; padding: 0; }
.primary-nav a { display: block; padding: 0.4em 0.75em; font-size: 0.92rem; text-decoration: none; color: var(--c-ink-2); border-radius: var(--radius); }
.primary-nav a:hover { color: var(--c-ink); background: var(--c-surface-2); }
.primary-nav a[aria-current='page'] { color: var(--c-accent); font-weight: 600; }
.search-link { margin-left: auto; display: inline-flex; align-items: center; gap: 0.45em; font-family: var(--font-mono); font-size: 0.82rem; color: var(--c-ink-2); text-decoration: none; border: 1px solid var(--c-line-strong); border-radius: 999px; padding: 0.4em 1em; }
.search-link:hover { color: var(--c-accent); border-color: var(--c-accent); }
.mobile-nav { display: none; position: relative; }

@media (max-width: 56rem) {
  .primary-nav { display: none; }
  .mobile-nav { display: block; }
  .mobile-nav summary { list-style: none; cursor: pointer; font-family: var(--font-mono); font-size: 0.82rem; border: 1px solid var(--c-line-strong); border-radius: var(--radius); padding: 0.4em 0.9em; color: var(--c-ink-2); }
  .mobile-nav summary::-webkit-details-marker { display: none; }
  .mobile-nav[open] summary { color: var(--c-accent); border-color: var(--c-accent); }
  .mobile-nav nav { position: absolute; right: 0; top: calc(100% + 0.5rem); z-index: 50; min-width: 12rem; background: var(--c-surface); border: 1px solid var(--c-line-strong); border-radius: var(--radius-lg); box-shadow: 0 10px 30px -10px rgb(0 0 0 / 0.3); padding: 0.5rem; }
  .mobile-nav ul { list-style: none; margin: 0; padding: 0; }
  .mobile-nav nav a { display: block; padding: 0.55em 0.9em; text-decoration: none; color: var(--c-ink); border-radius: var(--radius); font-size: 0.95rem; }
  .mobile-nav nav a:hover { background: var(--c-surface-2); color: var(--c-accent); }
}
@media (max-width: 40rem) {
  .main-bar { gap: 0.8rem; }
  .search-link span { display: none; }
  .search-link { padding: 0.5em; border-radius: 50%; }
  .sys-item:first-child { display: none; }
}

/* ---- Footer ---- */
.site-footer { margin-top: 4rem; border-top: 1px solid var(--c-line); background: var(--c-surface); font-size: 0.9rem; }
.footer-grid { display: grid; grid-template-columns: 2fr repeat(4, 1fr); gap: 2rem; padding-block: 2.5rem 2rem; }
.footer-logo { font-size: 1.1rem; font-weight: 700; letter-spacing: 0.25em; margin-bottom: 0.2em; }
.footer-logo span { font-family: var(--font-mono); font-size: 0.6rem; letter-spacing: 0.3em; color: var(--c-ink-3); font-weight: 400; }
.footer-tagline { font-family: var(--font-mono); color: var(--c-accent); font-size: 0.85rem; margin-bottom: 0.8em; }
.footer-desc { color: var(--c-ink-2); max-width: 26em; font-size: 0.85rem; }
.footer-heading { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.15em; color: var(--c-ink-3); margin: 0 0 0.9em; font-weight: 500; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 0.45em; }
.site-footer ul a { color: var(--c-ink-2); text-decoration: none; }
.site-footer ul a:hover { color: var(--c-accent); text-decoration: underline; }
.footer-legal { border-top: 1px solid var(--c-line); padding-block: 1.2rem 1.6rem; color: var(--c-ink-3); font-size: 0.8rem; }
.footer-legal p { margin: 0 0 0.5em; }
.footer-meta { font-family: var(--font-mono); letter-spacing: 0.04em; }
@media (max-width: 64rem) {
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-brand { grid-column: 1 / -1; }
}

/* ---- Breadcrumbs ---- */
.breadcrumbs { font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.03em; margin: 1.2rem 0 1.6rem; }
.breadcrumbs ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.4em; }
.breadcrumbs li { display: inline-flex; align-items: center; gap: 0.4em; color: var(--c-ink-3); }
.breadcrumbs li + li::before { content: '/'; color: var(--c-line-strong); }
.breadcrumbs a { color: var(--c-ink-2); text-decoration: none; }
.breadcrumbs a:hover { color: var(--c-accent); text-decoration: underline; }

/* ---- Page intro ---- */
.page-intro { padding-block: 1rem 2rem; max-width: 46em; }
.page-intro h1 { margin: 0.35em 0 0.4em; }
.page-intro .lede { color: var(--c-ink-2); font-size: 1.05rem; margin: 0; }

/* ---- Board foot ---- */
.board-foot { padding: 0.55rem 1.1rem; font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.08em; color: var(--board-dim); border-top: 1px solid var(--board-line); }

/* ---- FAQ ---- */
.faq-section { margin-top: 2rem; }
.faq-item { border: 1px solid var(--c-line); border-radius: var(--radius); background: var(--c-surface); margin-bottom: 0.6rem; }
.faq-item summary { cursor: pointer; padding: 0.75rem 1rem; font-weight: 550; list-style: none; display: flex; align-items: baseline; gap: 0.6em; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::before { content: 'Q'; font-family: var(--font-mono); font-size: 0.8rem; color: var(--c-accent); flex-shrink: 0; }
.faq-item[open] summary { border-bottom: 1px solid var(--c-line); }
.faq-item p, .faq-body { padding: 0.75rem 1rem 0.9rem 2.3rem; margin: 0; color: var(--c-ink-2); font-size: 0.95rem; }
.faq-body p { padding: 0; }
.faq-more { font-size: 0.85rem; color: var(--c-ink-3); margin-top: 0.5em; }

/* ---- Related ---- */
.related { margin-top: 2.5rem; border-top: 1px solid var(--c-line); padding-top: 1rem; }
.related h2 { font-size: 0.85rem; font-family: var(--font-mono); letter-spacing: 0.12em; color: var(--c-ink-3); border: none; margin-top: 0.5em; }
.related ul { list-style: none; margin: 0; padding: 0; }
.related li { padding: 0.5em 0; border-bottom: 1px dashed var(--c-line); display: flex; flex-wrap: wrap; gap: 0.3em 1em; align-items: baseline; }
.related li:last-child { border-bottom: none; }
.related-summary { color: var(--c-ink-3); font-size: 0.84rem; }

/* ---- Article ---- */
.article-shell { padding-block: 0 2rem; }
.article-shell article { max-width: var(--measure); }

/* 带锚点侧栏的文章布局：正文 + 右侧粘性导航
   正文列加宽以容纳数据面板/宽表格；正文文字仍限制在阅读行长内保证可读性。 */
.article-shell.has-toc {
  display: grid;
  grid-template-columns: minmax(0, 50rem) 12rem;
  grid-template-areas: 'main toc';
  gap: 2.5rem;
  align-items: start;
  max-width: calc(50rem + 12rem + 2.5rem);
}
.article-shell.has-toc > article { grid-area: main; max-width: none; min-width: 0; }
.article-shell.has-toc .article-head { max-width: var(--measure); }
.article-shell.has-toc .prose { max-width: none; }
.article-shell.has-toc .prose > p,
.article-shell.has-toc .prose > ul,
.article-shell.has-toc .prose > ol,
.article-shell.has-toc .prose > blockquote { max-width: var(--measure); }
/* 面板 / 规格表 / 宽表格占满正文列 */
.article-toc { grid-area: toc; position: sticky; top: 1.5rem; font-size: 0.86rem; }
.article-toc .toc-title {
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.12em;
  color: var(--c-ink-3); text-transform: uppercase; margin: 0 0 0.7rem;
}
.article-toc ul { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--c-line); }
.article-toc li { margin: 0; }
.article-toc a {
  display: block; padding: 0.35em 0 0.35em 0.9rem; margin-left: -1px;
  border-left: 2px solid transparent; color: var(--c-ink-2); text-decoration: none;
  line-height: 1.35; transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.article-toc a:hover { color: var(--c-accent); }
.article-toc a.active { color: var(--c-accent); border-left-color: var(--c-accent); font-weight: 600; }
@media (max-width: 68rem) {
  .article-shell.has-toc {
    grid-template-columns: 1fr; grid-template-areas: 'toc' 'main'; gap: 1.2rem; max-width: var(--measure);
  }
  .article-toc {
    position: static; border: 1px solid var(--c-line); border-radius: var(--radius-lg);
    background: var(--c-surface); padding: 0.9rem 1.1rem;
  }
  .article-toc ul { display: flex; flex-wrap: wrap; gap: 0.2rem 0.4rem; border-left: none; }
  .article-toc a {
    padding: 0.3em 0.7em; border: 1px solid var(--c-line-strong); border-radius: 999px; margin: 0;
    font-size: 0.82rem;
  }
  .article-toc a.active { border-color: var(--c-accent); background: var(--c-accent-soft); }
}
.article-head { margin-bottom: 2rem; }
.article-head h1 { margin: 0.4em 0 0.5em; }
.article-head .chips { display: flex; flex-wrap: wrap; gap: 0.4em; margin: 0 0 1em; }
.answer-box { border: 1px solid var(--c-line-strong); border-left: 4px solid var(--c-accent); background: var(--c-surface); border-radius: var(--radius); padding: 0.9rem 1.1rem; margin: 1.2rem 0 0.9rem; }
.answer-box p { margin: 0; font-size: 1.02rem; font-weight: 500; }
.sources { margin-top: 2.5rem; font-size: 0.9rem; }
.sources h2 { font-size: 0.85rem; font-family: var(--font-mono); letter-spacing: 0.12em; color: var(--c-ink-3); border-top: 1px solid var(--c-line); padding-top: 1.4em; }
.sources ul { padding-left: 1.2em; color: var(--c-ink-2); }

/* ---- Spec panel ---- */
.spec-panel { margin: 0 0 1.6rem; }
.spec-grid { display: grid; gap: 0; margin: 0; border: 1px solid var(--c-line); border-radius: var(--radius-lg); overflow: hidden; }
.spec-row { display: grid; grid-template-columns: 7.5rem 1fr; gap: 1rem; padding: 0.7rem 1rem; border-bottom: 1px solid var(--c-line); }
.spec-row:last-child { border-bottom: none; }
.spec-row:nth-child(odd) { background: var(--c-surface); }
.spec-row dt { font-family: var(--font-mono); font-size: 0.8rem; color: var(--c-ink-3); margin: 0; }
.spec-row dd { margin: 0; font-size: 0.92rem; display: flex; flex-wrap: wrap; gap: 0.4em; align-items: flex-start; }
/* 亮点/注意里的长句标签允许换行，避免被规格表圆角裁切 */
.spec-row dd .chip { white-space: normal; line-height: 1.5; }
.spec-note { font-size: 0.8rem; color: var(--c-ink-3); margin: 0.6rem 0 0; }
.rating { display: inline-flex; align-items: center; gap: 0.5em; }
.rating-dots { display: inline-flex; gap: 3px; }
.rating .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--c-line-strong); }
.rating .dot.on { background: var(--c-accent); }

/* ---- 推广 CTA（已披露的联盟链接）---- */
.aff-cta {
  margin-top: 2.2rem;
  border: 1px solid var(--c-line-strong);
  border-left: 4px solid var(--c-accent);
  background: var(--c-surface);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
}
.aff-cta p { margin: 0.5rem 0 0; font-size: 0.92rem; color: var(--c-ink-2); }
.aff-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 0.9rem; margin-top: 1rem; }
.aff-promo { font-size: 0.88rem; color: var(--c-ink-2); }
.aff-promo code {
  background: var(--c-amber-soft);
  border-color: color-mix(in srgb, var(--c-amber) 40%, transparent);
  color: var(--c-amber);
}

/* ---- 实测数据面板（真实数据）---- */
.perf-panel {
  margin: 2.2rem 0;
  border: 1px solid var(--c-line-strong);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--c-surface);
}
.perf-head {
  background: var(--board-bg);
  color: var(--board-bright);
  padding: 0.75rem 1rem;
}
.perf-title { font-weight: 650; display: flex; align-items: center; gap: 0.6em; }
.perf-live {
  font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.12em;
  color: var(--board-bg); background: var(--board-green); padding: 0.2em 0.5em; border-radius: 4px;
}
.perf-meta { font-family: var(--font-mono); font-size: 0.72rem; color: var(--board-dim); margin-top: 0.35em; letter-spacing: 0.02em; }
.perf-toolbar {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.45rem;
  padding: 0.7rem 1rem; border-bottom: 1px solid var(--c-line); background: var(--c-surface-2);
}
.perf-toolbar-lab { font-family: var(--font-mono); font-size: 0.72rem; color: var(--c-ink-3); letter-spacing: 0.06em; }
.perf-chip {
  font: inherit; font-size: 0.8rem; padding: 0.22em 0.75em; border-radius: 999px;
  border: 1px solid var(--c-line-strong); background: transparent; color: var(--c-ink-2); cursor: pointer;
}
.perf-chip:hover { border-color: var(--c-accent); color: var(--c-accent); }
.perf-chip[aria-pressed='true'] { background: var(--c-accent); border-color: var(--c-accent); color: #fff; }
.perf-tablewrap { overflow-x: auto; }
.perf-table { width: 100%; border-collapse: collapse; font-family: var(--font-mono); font-size: 0.8rem; }
.perf-table thead th {
  position: sticky; top: 0; background: var(--c-surface-2); color: var(--c-ink-2);
  text-align: right; padding: 0.5em 0.7em; white-space: nowrap; font-size: 0.72rem;
  border-bottom: 2px solid var(--c-line-strong); font-weight: 600;
}
.perf-table thead th:nth-child(-n+3) { text-align: left; }
.perf-table td { padding: 0.4em 0.7em; border-bottom: 1px solid var(--c-line); text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
.perf-table tbody tr:hover td { background: color-mix(in srgb, var(--c-accent) 5%, transparent); }
.perf-idx { text-align: left; color: var(--c-ink-3); }
.perf-name { text-align: left; color: var(--c-ink); font-family: var(--font-sans); }
.perf-type { text-align: left; }
.perf-badge { font-size: 0.66rem; padding: 0.1em 0.45em; border-radius: 4px; border: 1px solid var(--c-line-strong); color: var(--c-ink-2); }
.perf-lat { border-radius: 4px; padding: 0.1em 0.5em; font-weight: 600; }
.perf-lat.good { color: var(--c-good); background: var(--c-good-soft); }
.perf-lat.mid { color: var(--c-amber); background: var(--c-amber-soft); }
.perf-lat.bad { color: var(--c-risk); background: var(--c-risk-soft); }
.perf-num { color: var(--c-ink); }
.perf-bar { display: inline-flex; justify-content: flex-end; }
.perf-track { width: 90px; height: 8px; background: var(--c-blue-soft); border-radius: 3px; overflow: hidden; }
.perf-fill { display: block; height: 100%; background: var(--c-blue); border-radius: 3px; }
.perf-udp { text-align: left; color: var(--c-ink-3); font-size: 0.74rem; }
.perf-anom td { color: var(--c-risk); }
.perf-anom .perf-name { color: var(--c-risk); }
.perf-summary { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 1px; background: var(--c-line); }
.perf-summary div { background: var(--c-surface-2); padding: 0.65rem 1rem; }
.perf-k { font-family: var(--font-mono); font-size: 0.68rem; color: var(--c-ink-3); letter-spacing: 0.04em; display: block; }
.perf-v { font-family: var(--font-mono); font-size: 1.1rem; color: var(--c-ink); font-variant-numeric: tabular-nums; }
.perf-v small { font-size: 0.68rem; color: var(--c-ink-3); }
.perf-foot { padding: 0.6rem 1rem; font-size: 0.72rem; color: var(--c-ink-3); font-family: var(--font-mono); line-height: 1.5; }
.perf-empty { text-align: center; color: var(--c-ink-3); padding: 1.5rem; }

.perf-live.official { background: var(--c-amber); color: #fff; }
/* 价格面板：前两列左对齐，其余右对齐 */
.perf-price thead th { text-align: right; }
.perf-price thead th:nth-child(-n+2) { text-align: left; }
.perf-price td:nth-child(2) { text-align: left; color: var(--c-ink-2); }
.perf-dim { color: var(--c-ink-3); }
.perf-price-perm td { background: color-mix(in srgb, var(--c-amber) 8%, transparent); }
.perf-price-perm .perf-name { color: var(--c-amber); }

/* 解锁矩阵单元格 */
.perf-matrix td { text-align: center; }
.perf-matrix td.perf-idx, .perf-matrix td.perf-name, .perf-matrix td.perf-type { text-align: left; }
.perf-cell { display: inline-block; min-width: 3.6em; padding: 0.12em 0.45em; border-radius: 4px; font-size: 0.7rem; font-weight: 600; }
.perf-cell.ok { color: var(--c-good); background: var(--c-good-soft); }
.perf-cell.no { color: var(--c-risk); background: var(--c-risk-soft); }
.perf-cell.na { color: var(--c-ink-3); background: var(--c-surface-2); font-weight: 400; }
.perf-cell.warn { color: var(--c-amber); background: var(--c-amber-soft); }
.perf-cell.cur { color: var(--c-ink-2); background: transparent; font-weight: 400; font-family: var(--font-mono); }

/* ---- Content card ---- */
.content-card { display: flex; flex-direction: column; height: 100%; }
.cc-code { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.1em; color: var(--c-accent); margin-bottom: 0.3rem; }
.content-card h3 { margin: 0 0 0.4rem; font-size: 1.05rem; }
.content-card p { margin: 0; color: var(--c-ink-2); font-size: 0.88rem; }
.cc-chips { margin-top: 0.8rem; display: flex; flex-wrap: wrap; gap: 0.35em; }
.cc-chips .chip { font-size: 0.68rem; padding: 0.25em 0.5em; }

/* ---- Category block / hub ---- */
.block { padding-block: 2.8rem; }
.block-head { margin-bottom: 1.4rem; }
.block-head h2 { margin: 0.4em 0 0.2em; }
.block-lede { color: var(--c-ink-2); margin: 0; }
.cat-block { margin-bottom: 2.6rem; }
.cat-head { display: flex; align-items: baseline; gap: 0.6rem; font-size: 1.15rem; border-bottom: 1px solid var(--c-line); padding-bottom: 0.5rem; margin-bottom: 1.2rem; margin-top: 0; }
.cat-count { font-family: var(--font-mono); font-size: 0.78rem; color: var(--c-ink-3); }
.hub-tip { color: var(--c-ink-2); font-size: 0.92rem; margin: -0.6rem 0 1.2rem; }

/* ---- Filter bar ---- */
.filter-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem 1.2rem; padding: 0.9rem 1.1rem; background: var(--c-surface); border: 1px solid var(--c-line); border-radius: var(--radius-lg); margin-bottom: 1.4rem; }
.filter-group { display: flex; align-items: center; gap: 0.4rem; flex-wrap: wrap; }
.filter-label { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.08em; color: var(--c-ink-3); }
.filter-btn { font: inherit; font-size: 0.82rem; padding: 0.3em 0.8em; border: 1px solid var(--c-line-strong); border-radius: 999px; background: transparent; color: var(--c-ink-2); cursor: pointer; transition: all var(--t-fast) var(--ease); }
.filter-btn:hover { border-color: var(--c-accent); color: var(--c-accent); }
.filter-btn[aria-pressed='true'] { background: var(--c-accent); border-color: var(--c-accent); color: #fff; }
.filter-reset { font-family: var(--font-mono); font-size: 0.75rem; margin-left: auto; background: none; border: none; color: var(--c-ink-3); cursor: pointer; text-decoration: underline; }
.filter-reset:hover { color: var(--c-accent); }
.filter-empty { text-align: center; color: var(--c-ink-3); padding: 2rem; }

/* ---- Glossary hub ---- */
.glossary-search { margin-bottom: 1.6rem; }
.glossary-search input { width: 100%; max-width: 30em; font: inherit; padding: 0.7em 1em; border: 1px solid var(--c-line-strong); border-radius: var(--radius); background: var(--c-surface); color: var(--c-ink); }
.glossary-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.6rem; }
.glossary-item { display: flex; flex-direction: column; gap: 0.2rem; padding: 0.8rem 1rem; border: 1px solid var(--c-line); border-radius: var(--radius); background: var(--c-surface); text-decoration: none; color: inherit; transition: border-color var(--t-fast) var(--ease); }
.glossary-item:hover { border-color: var(--c-accent); color: inherit; }
.gi-term { font-weight: 650; font-size: 1rem; }
.gi-desc { font-size: 0.82rem; color: var(--c-ink-2); }
.glossary-empty { text-align: center; color: var(--c-ink-3); padding: 1.5rem; }
.term-aka { font-family: var(--font-mono); font-size: 0.82rem; color: var(--c-ink-3); margin: 0 0 0.4rem; }
.term-back { margin-top: 2rem; font-family: var(--font-mono); font-size: 0.85rem; }
.term-back a { text-decoration: none; }
@media (max-width: 40rem) { .glossary-list { grid-template-columns: 1fr; } }

/* ---- Compare tables ---- */
.table-wrap { overflow-x: auto; border: 1px solid var(--c-line); border-radius: var(--radius-lg); margin: 1rem 0; }
.table-wrap table { min-width: 34rem; }
.table-wrap th, .table-wrap td { padding: 0.7em 1em; }
.table-wrap tbody th { font-weight: 600; }
.table-wrap tbody th a { text-decoration: none; }
.compare-note { font-size: 0.9rem; color: var(--c-ink-2); background: var(--c-surface); border-left: 3px solid var(--c-accent); padding: 0.8rem 1rem; border-radius: var(--radius); margin-top: 1.4rem; }

/* ---- Updates ---- */
.update-timeline { display: flex; flex-direction: column; gap: 1.5rem; }
.update-entry { display: grid; grid-template-columns: 10rem 1fr; gap: 1.5rem; padding-bottom: 1.5rem; border-bottom: 1px solid var(--c-line); }
.update-meta { display: flex; flex-direction: column; gap: 0.5rem; align-items: flex-start; font-family: var(--font-mono); font-size: 0.82rem; color: var(--c-ink-3); }
.update-content h2 { margin-top: 0; font-size: 1.15rem; }
.update-content { font-size: 0.94rem; }
@media (max-width: 46rem) { .update-entry { grid-template-columns: 1fr; gap: 0.6rem; } .update-meta { flex-direction: row; align-items: center; } }

/* ---- Topics ---- */
.topic-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.2rem; }
.topic-card { border: 1px solid var(--c-line); border-radius: var(--radius-lg); background: var(--c-surface); padding: 1.4rem; }
.topic-card h2 { margin: 0 0 0.4rem; font-size: 1.15rem; }
.topic-desc { color: var(--c-ink-2); font-size: 0.9rem; margin: 0 0 1rem; }
.topic-steps { margin: 0; padding-left: 1.2rem; }
.topic-steps li { margin-bottom: 0.4em; }
.topic-steps li::marker { color: var(--c-accent); font-family: var(--font-mono); }
@media (max-width: 46rem) { .topic-grid { grid-template-columns: 1fr; } }

/* ---- Start path ---- */
.start-path { display: flex; flex-direction: column; gap: 0.7rem; margin-bottom: 2rem; }
.start-step { display: grid; grid-template-columns: 3rem 1fr auto; gap: 1rem; align-items: center; padding: 1rem 1.2rem; border: 1px solid var(--c-line); border-radius: var(--radius-lg); background: var(--c-surface); text-decoration: none; color: inherit; transition: border-color var(--t-med) var(--ease), transform var(--t-med) var(--ease); }
.start-step:hover { border-color: var(--c-accent); transform: translateX(4px); color: inherit; }
.start-num { font-family: var(--font-mono); font-size: 1.3rem; color: var(--c-accent); font-weight: 600; }
.start-body { display: flex; flex-direction: column; gap: 0.15rem; }
.start-title { font-weight: 650; font-size: 1.05rem; }
.start-note { font-size: 0.86rem; color: var(--c-ink-2); }
.start-arrow { color: var(--c-accent); font-family: var(--font-mono); }

/* ---- Search page ---- */
.search-box input { width: 100%; font: inherit; font-size: 1.05rem; padding: 0.85em 1.1em; border: 1px solid var(--c-line-strong); border-radius: var(--radius-lg); background: var(--c-surface); color: var(--c-ink); }
.search-box input:focus-visible { border-color: var(--c-accent); outline-offset: 0; }
.search-status { font-size: 0.9rem; color: var(--c-ink-2); margin: 1rem 0; min-height: 1.2em; }
.search-results { display: flex; flex-direction: column; gap: 0.6rem; }
.search-hit { display: grid; grid-template-columns: 5rem 1fr; grid-template-areas: 'kind title' 'kind summary'; gap: 0.1rem 1rem; padding: 0.9rem 1.1rem; border: 1px solid var(--c-line); border-radius: var(--radius); background: var(--c-surface); text-decoration: none; color: inherit; transition: border-color var(--t-fast) var(--ease); }
.search-hit:hover { border-color: var(--c-accent); color: inherit; }
.search-hit-kind { grid-area: kind; font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.06em; color: var(--c-accent); align-self: start; padding-top: 0.2em; }
.search-hit-title { grid-area: title; font-weight: 650; }
.search-hit-summary { grid-area: summary; font-size: 0.86rem; color: var(--c-ink-2); }
.search-hit mark, .prose mark { background: var(--c-amber-soft); color: var(--c-ink); padding: 0 0.1em; border-radius: 2px; }
@media (max-width: 40rem) { .search-hit { grid-template-columns: 1fr; grid-template-areas: 'kind' 'title' 'summary'; gap: 0.3rem; } }

/* ==========================================================================
   首页
   ========================================================================== */
.hero { padding-block: 2.5rem 1rem; background: radial-gradient(1200px 400px at 80% -10%, var(--c-accent-soft), transparent 70%); }
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 2.5rem; align-items: center; }
.hero-copy h1 { font-size: clamp(1.9rem, 1.3rem + 2.6vw, 3rem); line-height: 1.2; letter-spacing: -0.01em; margin: 0.5em 0 0.4em; }
.hero-lede { font-size: 1.05rem; color: var(--c-ink-2); max-width: 34em; margin-bottom: 1.6rem; }
.hero-search { display: flex; gap: 0.5rem; max-width: 36em; }
.hero-search input { flex: 1; font: inherit; font-size: 0.98rem; padding: 0.75em 1em; border: 1px solid var(--c-line-strong); border-radius: var(--radius); background: var(--c-surface); color: var(--c-ink); }
.hero-search input:focus-visible { border-color: var(--c-accent); outline-offset: 0; }
.hero-search button { font-family: var(--font-mono); font-size: 0.9rem; letter-spacing: 0.05em; padding: 0 1.4em; border: 1px solid var(--c-ink); background: var(--c-ink); color: var(--c-bg); border-radius: var(--radius); cursor: pointer; transition: background var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease); }
.hero-search button:hover { background: var(--c-accent); border-color: var(--c-accent); color: #fff; }
.hero-quicklinks { margin-top: 1.1rem; font-size: 0.86rem; color: var(--c-ink-3); display: flex; flex-wrap: wrap; gap: 0.3em 1em; align-items: baseline; }
.hero-quicklinks a { color: var(--c-ink-2); text-decoration: none; }
.hero-quicklinks a:hover { color: var(--c-accent); text-decoration: underline; }

/* 全站主推：本站实测推荐机场 */
.feature-airport {
  display: block; position: relative; text-decoration: none; color: inherit;
  border: 1px solid var(--c-line-strong); border-left: 4px solid var(--c-accent);
  border-radius: var(--radius-lg); background: var(--c-surface);
  padding: 1.3rem 1.5rem 1.4rem;
  transition: border-color var(--t-med) var(--ease), transform var(--t-med) var(--ease), box-shadow var(--t-med) var(--ease);
}
.feature-airport:hover { color: inherit; transform: translateY(-2px); box-shadow: 0 8px 24px -12px color-mix(in srgb, var(--c-ink) 30%, transparent); border-left-color: var(--c-accent); }
.feature-badge {
  display: inline-block; font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.1em;
  color: #fff; background: var(--c-accent); padding: 0.25em 0.7em; border-radius: 999px; margin-bottom: 0.7rem;
}
.feature-name { display: flex; align-items: baseline; flex-wrap: wrap; gap: 0.4rem 1rem; margin: 0 0 0.5rem; font-size: 1.5rem; border: none; padding: 0; }
.feature-go { font-family: var(--font-mono); font-size: 0.82rem; color: var(--c-accent); font-weight: 500; }
.feature-airport:hover .feature-go { text-decoration: underline; }
.feature-sum { margin: 0 0 0.9rem; color: var(--c-ink-2); font-size: 0.95rem; max-width: 60ch; }
.feature-chips { display: flex; flex-wrap: wrap; gap: 0.4em; margin: 0 0 0.9rem; }
.feature-note { margin: 0; font-size: 0.8rem; color: var(--c-ink-3); font-family: var(--font-mono); }
.feature-note code { background: var(--c-amber-soft); border-color: color-mix(in srgb, var(--c-amber) 40%, transparent); color: var(--c-amber); }

.device-strip { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0.8rem; }
.device { display: flex; flex-direction: column; gap: 0.15rem; padding: 1rem 1.1rem; background: var(--c-surface); border: 1px solid var(--c-line); border-radius: var(--radius-lg); text-decoration: none; color: inherit; transition: border-color var(--t-med) var(--ease), transform var(--t-med) var(--ease); }
.device:hover { border-color: var(--c-accent); transform: translateY(-2px); color: inherit; }
.device-code { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.12em; color: var(--c-accent); }
.device-os { font-size: 1.1rem; font-weight: 650; }
.device-client { font-size: 0.82rem; color: var(--c-ink-3); }

.two-col { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 2.5rem; }
.two-col--wide { grid-template-columns: 1.1fr 0.9fr; }

.concept-list { display: flex; flex-direction: column; gap: 0.6rem; }
.concept { display: grid; grid-template-columns: 4rem 1fr auto; gap: 0.8rem; align-items: center; padding: 0.85rem 1rem; border: 1px solid var(--c-line); border-radius: var(--radius); background: var(--c-surface); text-decoration: none; color: inherit; transition: border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease); }
.concept:hover { border-color: var(--c-accent); background: var(--c-surface-2); color: inherit; }
.concept-term { font-size: 1.1rem; font-weight: 650; }
.concept-desc { font-size: 0.88rem; color: var(--c-ink-2); }
.concept-arrow { color: var(--c-accent); font-family: var(--font-mono); }

.scenario-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.4rem; }
.scenario-list a { display: flex; align-items: baseline; gap: 0.8rem; padding: 0.6rem 0.8rem; text-decoration: none; color: var(--c-ink); border-bottom: 1px dashed var(--c-line); transition: color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease); }
.scenario-list a:hover { color: var(--c-accent); padding-left: 1.1rem; }
.scenario-tag { font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.06em; color: var(--c-ink-3); border: 1px solid var(--c-line-strong); border-radius: 3px; padding: 0.1em 0.5em; flex-shrink: 0; min-width: 4.4em; text-align: center; }
.scenario-label { font-size: 0.95rem; }

.zone-card { position: relative; }
.zone-code { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.12em; color: var(--c-accent); }
.zone-card h3 { margin: 0.3em 0 0.4em; font-size: 1.05rem; }
.zone-card p { margin: 0; font-size: 0.85rem; color: var(--c-ink-2); }

.update-list { list-style: none; margin: 0; padding: 0; }
.update-list li { display: flex; align-items: baseline; gap: 0.7rem; padding: 0.7rem 0; border-bottom: 1px solid var(--c-line); flex-wrap: wrap; }
.update-date { font-family: var(--font-mono); font-size: 0.78rem; color: var(--c-ink-3); }
.update-list a { text-decoration: none; color: var(--c-ink); flex: 1; min-width: 12rem; }
.update-list a:hover { color: var(--c-accent); }
.more-link { margin-top: 1rem; font-size: 0.88rem; }
.more-link a { text-decoration: none; color: var(--c-accent); font-family: var(--font-mono); }

.risk-panel { background: var(--board-bg); color: var(--board-bright); border-radius: var(--radius-lg); padding: 1.6rem; }
.risk-panel .notice-label { color: var(--board-amber); }
.risk-panel h2 { color: var(--board-bright); margin: 0.2em 0 0.8em; font-size: 1.2rem; }
.risk-panel ol { margin: 0 0 1rem; padding-left: 1.2rem; }
.risk-panel li { margin-bottom: 0.6em; color: var(--board-dim); font-size: 0.92rem; }
.risk-panel li strong { color: var(--board-bright); }
.risk-panel .risk-foot { font-size: 0.82rem; color: var(--board-dim); margin: 0; }
.risk-panel a { color: var(--board-amber); }

.about-strip { display: grid; grid-template-columns: 1.4fr 0.6fr; gap: 2rem; align-items: center; padding: 1.8rem; border: 1px solid var(--c-line); border-radius: var(--radius-lg); background: var(--c-surface); }
.about-strip h2 { margin: 0.3em 0 0.4em; }
.about-strip p { margin: 0; color: var(--c-ink-2); }
.about-links { display: flex; flex-direction: column; gap: 0.6rem; }
.about-links .btn { justify-content: center; }

@media (max-width: 60rem) {
  .hero-grid { grid-template-columns: 1fr; gap: 1.8rem; }
  .two-col, .two-col--wide { grid-template-columns: 1fr; gap: 1.8rem; }
  .device-strip { grid-template-columns: repeat(2, 1fr); }
  .about-strip { grid-template-columns: 1fr; }
  .about-links { flex-direction: row; flex-wrap: wrap; }
}
@media (max-width: 40rem) {
  .hero-search { flex-direction: column; }
  .device-strip { grid-template-columns: 1fr 1fr; }
}

/* ==========================================================================
   背景网格涟漪（航图雷达脉冲）
   点击时从最近的网格单元向外扩散一圈，逐格渐亮再消散。纯装饰，渐进增强：
   无 JS 或降低动效时不出现，不影响任何内容与交互（pointer-events:none）。
   颜色随主题切换：亮=航图蓝（似水/墨），暗=信号绿（似雷达脉冲，贴合 ONLINE 语义）。
   ========================================================================== */
:root { --ripple-rgb: 43, 92, 140; }
:root[data-theme='dark'] { --ripple-rgb: 127, 208, 162; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) { --ripple-rgb: 127, 208, 162; }
}
.grid-ripple-canvas { position: fixed; inset: 0; z-index: 0; pointer-events: none; }
/* 内容层置于涟漪画布之上，涟漪只在网格留白处透出 */
.site-header, main, .site-footer { position: relative; z-index: 1; }
@media (prefers-reduced-motion: reduce) {
  .grid-ripple-canvas { display: none; }
}

/* ==========================================================================
   心电图分割线（替代英雄区下方的普通分割线）
   一条全宽的心电图基线 + 一道缓慢扫过的高亮脉冲。小幅度、微动，主题自适应。
   ========================================================================== */
.ecg-divider { width: 100%; margin-block: 0.6rem 0; }
.ecg-line {
  width: 100%;
  height: 26px;
  background:
    linear-gradient(90deg, transparent 0 42%, var(--c-accent) 50%, transparent 58% 100%),
    color-mix(in srgb, var(--c-ink-3) 55%, transparent);
  background-size: 200% 100%, 100% 100%;
  background-repeat: no-repeat, repeat-x;
  -webkit-mask: var(--ecg-mask) repeat-x left center / 200px 26px;
  mask: var(--ecg-mask) repeat-x left center / 200px 26px;
  animation: ecg-sweep 5.5s linear infinite;
}
/* 高亮脉冲从右向左扫过；基线层保持不动 */
@keyframes ecg-sweep {
  from { background-position: 150% 0, 0 0; }
  to { background-position: -50% 0, 0 0; }
}
@media (prefers-reduced-motion: reduce) {
  .ecg-line, .callsign::before { animation: none; }
}