/* ============================================================
   波音真人会馆 · 共享样式表 /assets/site.css
   夜间航电仪表盘 / 蓝图网格 / 珠宝色分区
   ============================================================ */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
img, svg { max-width: 100%; display: block; }
button, input { font: inherit; color: inherit; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 { margin: 0; font-weight: 250; letter-spacing: .08em; line-height: 1.16; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
[hidden] { display: none !important; }

/* ---------- 2. 变量 ---------- */
:root {
  --bl-navy-900: #061426;
  --bl-navy-800: #0B2138;
  --bl-navy-700: #123154;
  --bl-cyan-400: #2FE3D0;
  --bl-cyan-600: #17A99B;
  --bl-orange-500: #FF8A3D;
  --bl-gold-300: #FFC98B;
  --bl-violet-500: #6B4FE0;
  --bl-wine-600: #7A2B45;
  --bl-mist-100: #E8F1F8;
  --bl-slate-400: #A9BFD3;

  --bl-line: rgba(47, 227, 208, .26);
  --bl-line-soft: rgba(47, 227, 208, .12);
  --bl-line-strong: rgba(47, 227, 208, .55);

  --bl-font-display: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --bl-font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --bl-font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "DejaVu Sans Mono", "Noto Sans Mono CJK SC", monospace;

  --bl-wrap: 1320px;
  --bl-edge: clamp(18px, 4.2vw, 64px);
  --bl-header-h: 88px;
  --bl-radius: 16px;
  --bl-ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 3. 全局介质：蓝图网格与左缘框架线 ---------- */
body {
  background-color: var(--bl-navy-900);
  background-image:
    linear-gradient(rgba(47, 227, 208, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(47, 227, 208, .045) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px;
  background-position: -1px -1px;
  color: var(--bl-mist-100);
  font-family: var(--bl-font-body);
  font-size: 17px;
  line-height: 1.75;
  padding-top: var(--bl-header-h);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
body::after {
  content: "";
  position: fixed;
  inset: 0 auto 0 0;
  width: 2px;
  background: linear-gradient(180deg, rgba(47, 227, 208, .75), rgba(47, 227, 208, .06) 44%, rgba(107, 79, 224, .4));
  pointer-events: none;
  z-index: 70;
}
:focus-visible { outline: 2px solid var(--bl-cyan-400); outline-offset: 3px; }

/* ---------- 4. 布局与排版原子 ---------- */
.bl-wrapper { width: 100%; max-width: var(--bl-wrap); margin-inline: auto; padding-inline: var(--bl-edge); }
.bl-section { position: relative; padding: clamp(48px, 7vw, 96px) 0; }
.bl-grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 24px; }
.bl-rule { height: 1px; border: 0; margin: 0; background: linear-gradient(90deg, var(--bl-cyan-400), rgba(47, 227, 208, 0) 76%); }

.bl-kicker {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--bl-font-mono); font-size: 12px;
  letter-spacing: .22em; text-transform: uppercase; color: var(--bl-cyan-400);
}
.bl-kicker::before { content: ""; width: 26px; height: 1px; background: var(--bl-cyan-400); }
.bl-index { font-family: var(--bl-font-mono); font-size: 12px; letter-spacing: .18em; color: var(--bl-slate-400); }
.bl-lede { font-size: clamp(17px, 1.5vw, 20px); line-height: 1.8; color: var(--bl-slate-400); max-width: 62ch; }
.bl-note { font-size: 14px; line-height: 1.7; color: var(--bl-slate-400); border-left: 1px solid var(--bl-line); padding-left: 16px; }
.bl-sr {
  position: absolute !important; 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;
}
.bl-link { color: var(--bl-cyan-400); border-bottom: 1px solid rgba(47, 227, 208, .4); transition: color .24s var(--bl-ease), border-color .24s var(--bl-ease); }
.bl-link:hover { color: var(--bl-gold-300); border-color: var(--bl-gold-300); }
.bl-empty {
  padding: 22px 18px; border: 1px dashed var(--bl-line); border-radius: var(--bl-radius);
  color: var(--bl-slate-400); font-size: 14px; text-align: center;
}
.bl-filtered-out { display: none !important; }

/* ---------- 5. 按钮 / 卡片 / 标签 / 面包屑 ---------- */
.bl-btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 12px 22px; border-radius: 999px;
  border: 1px solid var(--bl-line-strong);
  background: transparent; color: var(--bl-mist-100);
  font-size: 15px; letter-spacing: .06em; cursor: pointer;
  transition: color .24s var(--bl-ease), border-color .24s var(--bl-ease), background-color .24s var(--bl-ease), transform .24s var(--bl-ease);
}
.bl-btn:hover { border-color: var(--bl-orange-500); color: var(--bl-gold-300); transform: translateX(4px); }
.bl-btn--primary { background: var(--bl-orange-500); border-color: var(--bl-orange-500); color: #08192b; font-weight: 500; }
.bl-btn--primary:hover { background: var(--bl-gold-300); border-color: var(--bl-gold-300); color: #08192b; }

.bl-card {
  position: relative; padding: 24px;
  border: 1px solid var(--bl-line); border-radius: var(--bl-radius);
  background: linear-gradient(180deg, rgba(18, 49, 84, .85), rgba(11, 33, 56, .93));
  box-shadow: inset 0 0 0 1px rgba(47, 227, 208, .06), 0 30px 60px -48px rgba(0, 0, 0, .9);
  transition: border-color .24s var(--bl-ease), transform .24s var(--bl-ease);
}
.bl-card:hover { border-color: var(--bl-orange-500); transform: translateX(4px); }
.bl-card--violet { border-color: rgba(107, 79, 224, .45); }
.bl-card--wine { border-color: rgba(122, 43, 69, .55); }

.bl-chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; border-radius: 999px;
  border: 1px solid var(--bl-line); background: rgba(18, 49, 84, .6);
  font-family: var(--bl-font-mono); font-size: 12px; letter-spacing: .14em;
  color: var(--bl-slate-400);
  transition: color .24s var(--bl-ease), background-color .24s var(--bl-ease), border-color .24s var(--bl-ease);
}
.bl-chip.is-active, .bl-chip[aria-pressed="true"] {
  background: var(--bl-orange-500); border-color: var(--bl-orange-500); color: #08192b;
}

.bl-crumb {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px;
  font-family: var(--bl-font-mono); font-size: 12px; letter-spacing: .16em; color: var(--bl-slate-400);
}
.bl-crumb a { transition: color .24s var(--bl-ease); }
.bl-crumb a:hover { color: var(--bl-cyan-400); }
.bl-crumb [aria-current] { color: var(--bl-mist-100); }

/* ---------- 6. 图片容器基础规则 ---------- */
.bl-figure {
  position: relative; overflow: hidden; margin: 0;
  border: 1px solid var(--bl-line); border-radius: var(--bl-radius);
  background-color: var(--bl-navy-700);
  background-image:
    linear-gradient(rgba(47, 227, 208, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(47, 227, 208, .07) 1px, transparent 1px);
  background-size: 34px 34px, 34px 34px;
  box-shadow: inset 0 0 0 1px rgba(47, 227, 208, .08), 0 34px 64px -52px rgba(0, 0, 0, .95);
}
.bl-figure > img { width: 100%; height: 100%; object-fit: cover; }
.bl-figure::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(120% 90% at 82% 12%, rgba(107, 79, 224, .3), transparent 58%),
    radial-gradient(90% 70% at 12% 88%, rgba(47, 227, 208, .16), transparent 62%),
    linear-gradient(180deg, rgba(6, 20, 38, 0) 44%, rgba(6, 20, 38, .74));
}
.bl-figure > figcaption {
  position: absolute; left: 18px; right: 18px; bottom: 14px; z-index: 2;
  font-family: var(--bl-font-mono); font-size: 12px; letter-spacing: .12em; color: var(--bl-slate-400);
}
.bl-ratio-16x9 { aspect-ratio: 16 / 9; }
.bl-ratio-4x5 { aspect-ratio: 4 / 5; }
.bl-ratio-1x1 { aspect-ratio: 1 / 1; }

/* ---------- 7. 跳转链接 ---------- */
.bl-skip {
  position: absolute; left: 50%; top: -72px; transform: translateX(-50%);
  z-index: 200; padding: 10px 20px; border-radius: 0 0 12px 12px;
  background: var(--bl-orange-500); color: #08192b; font-size: 14px;
  transition: top .2s var(--bl-ease);
}
.bl-skip:focus { top: 0; }

/* ---------- 8. 页头框架 ---------- */
.bl-masthead {
  position: fixed; inset: 0 0 auto 0; z-index: 60;
  background: linear-gradient(180deg, rgba(11, 33, 56, .97), rgba(6, 20, 38, .9));
  border-bottom: 1px solid var(--bl-line);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.bl-progress { position: absolute; inset: 0 0 auto 0; height: 2px; background: rgba(47, 227, 208, .12); overflow: hidden; }
.bl-progress-bar {
  display: block; width: 100%; height: 100%;
  transform: scaleX(0); transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--bl-cyan-400), var(--bl-orange-500));
  transition: transform .12s linear;
}
.bl-masthead-inner {
  max-width: var(--bl-wrap); margin-inline: auto;
  padding: 0 var(--bl-edge); min-height: var(--bl-header-h);
  display: grid; grid-template-columns: auto 1fr auto;
  align-items: center; gap: clamp(14px, 2.4vw, 40px);
}

.bl-brand { display: inline-flex; align-items: center; gap: 14px; padding: 10px 0; }
.bl-brand-mark { position: relative; width: 34px; height: 34px; flex: 0 0 auto; border: 1px solid var(--bl-cyan-400); border-radius: 10px; }
.bl-brand-mark i { position: absolute; display: block; background: var(--bl-cyan-400); }
.bl-brand-mark i:nth-child(1) { left: 7px; right: 7px; top: 11px; height: 1px; }
.bl-brand-mark i:nth-child(2) { left: 7px; right: 7px; bottom: 11px; height: 1px; }
.bl-brand-mark i:nth-child(3) { left: 16px; top: 7px; bottom: 7px; width: 1px; background: var(--bl-cyan-600); }
.bl-brand-text { display: flex; flex-direction: column; gap: 2px; line-height: 1.2; }
.bl-brand-name { font-family: var(--bl-font-display); font-size: 17px; font-weight: 300; letter-spacing: .14em; color: var(--bl-mist-100); transition: color .24s var(--bl-ease); }
.bl-brand-sub { font-family: var(--bl-font-mono); font-size: 10px; letter-spacing: .2em; color: var(--bl-cyan-600); text-transform: uppercase; }
.bl-brand:hover .bl-brand-name { color: var(--bl-cyan-400); }

.bl-nav-list { display: flex; align-items: center; justify-content: center; gap: clamp(8px, 1.6vw, 22px); }
.bl-nav-link {
  position: relative; display: inline-block; padding: 8px 2px;
  font-size: 14px; letter-spacing: .12em; white-space: nowrap;
  color: var(--bl-slate-400);
  transition: color .24s var(--bl-ease);
}
.bl-nav-link::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 2px; height: 1px;
  background: var(--bl-cyan-400); transform: scaleX(0); transform-origin: 0 50%;
  transition: transform .24s var(--bl-ease);
}
.bl-nav-link:hover { color: var(--bl-mist-100); }
.bl-nav-link:hover::after { transform: scaleX(1); }
.bl-nav-link[aria-current="page"] { color: var(--bl-cyan-400); }
.bl-nav-link[aria-current="page"]::after { transform: scaleX(1); background: var(--bl-orange-500); }

.bl-search {
  display: flex; align-items: center; gap: 10px;
  width: 240px; padding-bottom: 4px;
  border-bottom: 1px solid var(--bl-cyan-600);
  transition: border-color .24s var(--bl-ease);
}
.bl-search::before {
  content: ""; flex: 0 0 auto; width: 9px; height: 9px;
  border: 1px solid var(--bl-cyan-400); border-radius: 50%;
}
.bl-search:focus-within { border-color: var(--bl-orange-500); }
.bl-search-label {
  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;
}
.bl-search-input {
  width: 100%; min-width: 0; padding: 6px 0;
  background: transparent; border: 0; outline: none;
  font-size: 14px; letter-spacing: .05em; color: var(--bl-mist-100);
}
.bl-search-input::placeholder { color: rgba(169, 191, 211, .65); }
.bl-search-input::-webkit-search-cancel-button { -webkit-appearance: none; appearance: none; }
.bl-search-count {
  font-family: var(--bl-font-mono); font-size: 11px; letter-spacing: .1em;
  color: var(--bl-orange-500); white-space: nowrap;
}

.bl-nav-toggle {
  display: none; align-items: center; gap: 10px;
  padding: 8px 16px 8px 12px; border-radius: 999px;
  border: 1px solid var(--bl-line-strong); background: transparent;
  color: var(--bl-mist-100); cursor: pointer;
  transition: border-color .24s var(--bl-ease), color .24s var(--bl-ease);
}
.bl-nav-toggle:hover { border-color: var(--bl-orange-500); color: var(--bl-gold-300); }
.bl-nav-toggle-bars { position: relative; display: block; width: 18px; height: 10px; }
.bl-nav-toggle-bars::before,
.bl-nav-toggle-bars::after {
  content: ""; position: absolute; left: 0; width: 18px; height: 1px;
  background: var(--bl-cyan-400);
  transition: transform .24s var(--bl-ease), top .24s var(--bl-ease), bottom .24s var(--bl-ease);
}
.bl-nav-toggle-bars::before { top: 1px; }
.bl-nav-toggle-bars::after { bottom: 1px; }
.bl-masthead[data-open] .bl-nav-toggle-bars::before { top: 4px; transform: rotate(45deg); }
.bl-masthead[data-open] .bl-nav-toggle-bars::after { bottom: 5px; transform: rotate(-45deg); }
.bl-nav-toggle-text { font-size: 13px; letter-spacing: .14em; }

.bl-search-orb {
  display: none; align-items: center; justify-content: center;
  position: fixed; right: 20px; bottom: 20px; z-index: 80;
  width: 58px; height: 58px; border-radius: 50%;
  border: 1px solid var(--bl-cyan-400);
  background: rgba(11, 33, 56, .95); color: var(--bl-cyan-400);
  font-family: var(--bl-font-mono); font-size: 12px; letter-spacing: .1em;
  cursor: pointer;
  box-shadow: 0 18px 40px -24px rgba(0, 0, 0, .95), inset 0 0 0 1px rgba(47, 227, 208, .14);
  transition: background-color .24s var(--bl-ease), color .24s var(--bl-ease);
}
.bl-search-orb:hover { background: var(--bl-orange-500); color: #08192b; border-color: var(--bl-orange-500); }

/* ---------- 9. 页脚 ---------- */
.bl-foot {
  position: relative; margin-top: clamp(64px, 9vw, 140px);
  background: var(--bl-navy-800);
  border-top: 1px solid var(--bl-line);
}
.bl-foot::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 2px;
  background: linear-gradient(90deg, var(--bl-cyan-400), rgba(47, 227, 208, 0) 62%);
}
.bl-foot-grid {
  display: grid; grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: clamp(24px, 3vw, 48px);
  padding: clamp(40px, 5vw, 64px) 0 clamp(26px, 3vw, 40px);
}
.bl-foot-brand { padding-right: 8px; }
.bl-foot-brand-name { font-family: var(--bl-font-display); font-size: 20px; font-weight: 300; letter-spacing: .14em; margin-bottom: 12px; }
.bl-foot-brand-note { font-size: 14px; line-height: 1.8; color: var(--bl-slate-400); max-width: 34ch; margin-bottom: 20px; }
.bl-foot-col { min-width: 0; }
.bl-foot-title {
  font-family: var(--bl-font-mono); font-size: 12px; letter-spacing: .2em;
  text-transform: uppercase; color: var(--bl-cyan-600); margin-bottom: 16px;
}
.bl-foot-list { display: flex; flex-direction: column; gap: 10px; }
.bl-foot-link { font-size: 14px; color: var(--bl-slate-400); transition: color .24s var(--bl-ease); }
.bl-foot-link:hover { color: var(--bl-cyan-400); }
.bl-foot-meta { padding-bottom: 32px; }
.bl-foot-contact {
  display: flex; flex-wrap: wrap; gap: 6px 26px;
  padding: 18px 0; border-top: 1px solid var(--bl-line-soft);
  font-size: 14px; color: var(--bl-slate-400);
}
.bl-foot-legal {
  display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 12px 24px;
  padding-top: 18px; border-top: 1px solid var(--bl-line-soft);
  font-family: var(--bl-font-mono); font-size: 12px; letter-spacing: .14em;
  color: rgba(169, 191, 211, .78);
}
.bl-foot-legal-links { display: flex; flex-wrap: wrap; gap: 18px; }

/* ---------- 10. 章节显现 ---------- */
.bl-js [data-reveal] { opacity: 0; transform: translateY(24px); transition: opacity .42s var(--bl-ease), transform .42s var(--bl-ease); }
.bl-js [data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 11. 响应式 ---------- */
@media (max-width: 1120px) {
  .bl-search { width: 190px; }
}
@media (max-width: 980px) {
  :root { --bl-header-h: 72px; }
  .bl-masthead-inner { grid-template-columns: auto 1fr; gap: 14px; }
  .bl-nav-toggle { display: inline-flex; order: -1; }
  .bl-brand { justify-self: start; }
  .bl-search { display: none; }
  .bl-masthead[data-search-open] .bl-search {
    display: flex; position: absolute; left: var(--bl-edge); right: var(--bl-edge);
    top: 50%; transform: translateY(-50%); width: auto; z-index: 3;
    padding: 4px 14px 6px; border: 1px solid var(--bl-cyan-600); border-radius: 12px;
    background: var(--bl-navy-800);
  }
  .bl-search-orb { display: inline-flex; }
  .bl-nav {
    position: fixed; inset: var(--bl-header-h) 0 auto 0;
    max-height: calc(100vh - var(--bl-header-h)); overflow-y: auto;
    background: linear-gradient(180deg, rgba(11, 33, 56, .99), rgba(6, 20, 38, .99));
    border-bottom: 1px solid var(--bl-line);
    opacity: 0; visibility: hidden; pointer-events: none; transform: translateY(-12px);
    transition: opacity .24s var(--bl-ease), transform .24s var(--bl-ease), visibility .24s linear;
  }
  .bl-masthead[data-open] .bl-nav { opacity: 1; visibility: visible; pointer-events: auto; transform: none; }
  .bl-nav-list { flex-direction: column; align-items: stretch; gap: 0; padding: 8px var(--bl-edge) 28px; }
  .bl-nav-list li + li { border-top: 1px solid var(--bl-line-soft); }
  .bl-nav-link { display: block; padding: 16px 0; font-size: 16px; }
  .bl-nav-link::after { display: none; }
  .bl-nav-link[aria-current="page"] { padding-left: 14px; }
  .bl-nav-link[aria-current="page"]::before {
    content: ""; position: absolute; left: 0; top: 50%; width: 6px; height: 6px;
    margin-top: -3px; border-radius: 50%; background: var(--bl-orange-500);
  }
}
@media (max-width: 1024px) {
  .bl-foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 900px) {
  body { font-size: 16px; }
  .bl-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 16px; }
}
@media (max-width: 620px) {
  .bl-foot-grid { grid-template-columns: 1fr; }
  .bl-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .bl-foot-legal { justify-content: flex-start; }
}

/* ---------- 12. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .bl-js [data-reveal] { opacity: 1; transform: none; }
  .bl-progress-bar { transition: none; }
  .bl-btn:hover, .bl-card:hover { transform: none; }
}