/* ==========================================================================
   必发体验站 · 共享样式表 /assets/site.css
   夜间数据舱 + 档案索引库
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root {
  --ink-900: #0A1628;
  --ink-800: #112240;
  --ink-750: #0C1B31;
  --ink-700: #16294A;
  --signal: #FF6B35;
  --cyan: #00E5C3;
  --gold: #F0B429;
  --paper: #E6EDF7;
  --muted: #8892A8;
  --brown: #1A1A1A;
  --cream: #F5F0E6;

  --line: rgba(136, 146, 168, 0.26);
  --line-strong: rgba(230, 237, 247, 0.30);
  --line-cyan: rgba(0, 229, 195, 0.36);
  --line-gold: rgba(240, 180, 41, 0.42);
  --line-signal: rgba(255, 107, 53, 0.42);

  --wrap: 1200px;
  --gutter: clamp(16px, 4vw, 44px);
  --radius: 2px;

  --font-display: "Source Han Sans SC", "Noto Sans SC", "Alibaba PuHuiTi",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Source Han Serif SC", "Noto Serif SC", "Songti SC",
    "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "Menlo", "Consolas",
    "Courier New", monospace;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  background: var(--ink-900);
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  font-weight: 400;
  background-color: var(--ink-900);
  background-image:
    radial-gradient(1100px 620px at 6% -10%, rgba(0, 229, 195, 0.10), transparent 62%),
    radial-gradient(900px 540px at 104% 2%, rgba(255, 107, 53, 0.11), transparent 58%),
    radial-gradient(760px 700px at 50% 118%, rgba(240, 180, 41, 0.06), transparent 62%),
    linear-gradient(180deg, #0A1628 0%, #0B1A30 44%, #0A1628 100%);
  background-repeat: no-repeat;
  background-size: cover;
  overflow-x: hidden;
}

img, svg, video, canvas { max-width: 100%; height: auto; display: block; }
button { font: inherit; color: inherit; background: none; border: 0; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5, p, figure { margin: 0; }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 800; line-height: 1.24; }
table { border-collapse: collapse; width: 100%; }

::selection { background: var(--signal); color: var(--ink-900); }

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

/* ---------- 3. 排版 ---------- */
h1, .h1 {
  font-size: clamp(34px, 5.6vw, 68px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.01em;
}
h2, .h2 {
  font-size: clamp(24px, 3.2vw, 40px);
  font-weight: 900;
  line-height: 1.18;
}
h3, .h3 {
  font-size: clamp(19px, 2vw, 25px);
  font-weight: 800;
}

.mono {
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}

.eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.4;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--muted);
}

.lede {
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.95;
  color: #C6D2E6;
  max-width: 62ch;
}

/* ---------- 4. 布局 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding: clamp(46px, 7vw, 98px) 0; position: relative; }
.section--tight { padding: clamp(28px, 4vw, 54px) 0; }

.stack { display: flex; flex-direction: column; gap: clamp(14px, 2vw, 24px); }

.split { display: grid; grid-template-columns: minmax(0, 1fr); gap: clamp(18px, 3vw, 44px); }
@media (min-width: 1024px) {
  .split { grid-template-columns: minmax(160px, 220px) minmax(0, 1fr); }
  .split--right { grid-template-columns: minmax(0, 1fr) minmax(180px, 240px); }
}

.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 980px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .grid--2, .grid--3 { grid-template-columns: minmax(0, 1fr); }
}

.rule { height: 1px; border: 0; margin: 0; background: var(--line); }
.rule--gold { background: linear-gradient(90deg, var(--gold), rgba(240, 180, 41, 0)); }

/* 章节头：大编号 + 标题 + 窄注释 */
.section-head {
  display: grid;
  gap: 0.4em 0.9em;
  border-top: 1px solid var(--line);
  padding-top: 20px;
  margin-bottom: clamp(22px, 3vw, 40px);
}
.section-head__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(42px, 6.4vw, 86px);
  line-height: 0.88;
  letter-spacing: -0.03em;
  color: var(--gold);
}
.section-head__title { font-size: clamp(22px, 2.8vw, 34px); }
.section-head__note {
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 44ch;
}
@media (min-width: 900px) {
  .section-head { grid-template-columns: auto minmax(0, 1fr); }
  .section-head__num {
    grid-row: 1 / span 2;
    align-self: center;
    padding-right: clamp(16px, 2.2vw, 38px);
    border-right: 1px solid var(--line);
  }
  .section-head__title { grid-column: 2; }
  .section-head__note { grid-column: 2; }
}

.note-rail {
  border-left: 2px solid var(--signal);
  padding-left: 14px;
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--muted);
}

/* ---------- 5. 按钮 / 标签 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.74em 1.4em;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.2;
  color: var(--paper);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease),
    background-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.btn:hover { color: var(--signal); border-color: var(--signal); transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  color: var(--ink-900);
  background: var(--signal);
  border-color: var(--signal);
}
.btn--primary:hover {
  color: var(--ink-900);
  background: var(--gold);
  border-color: var(--gold);
}

.btn--ghost { color: var(--cyan); border-color: var(--line-cyan); }
.btn--ghost:hover { color: var(--ink-900); background: var(--cyan); border-color: var(--cyan); }

.tag,
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.28em 0.7em;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius);
  background: rgba(0, 229, 195, 0.05);
}
.tag--gold { color: var(--gold); border-color: var(--line-gold); background: rgba(240, 180, 41, 0.06); }
.tag--signal { color: var(--signal); border-color: var(--line-signal); background: rgba(255, 107, 53, 0.07); }

/* ---------- 6. 内容块 ---------- */
.panel {
  padding: clamp(18px, 2.4vw, 34px);
  background: linear-gradient(158deg, rgba(17, 34, 64, 0.92), rgba(10, 22, 40, 0.72));
  border: 1px solid var(--line);
  border-left: 3px solid var(--signal);
  border-radius: var(--radius);
}

.card {
  position: relative;
  padding: clamp(18px, 2vw, 26px);
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease),
    background-color 0.2s var(--ease);
}
.card:hover {
  border-color: var(--signal);
  background: var(--ink-700);
  transform: translateY(-3px);
}
.card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--gold);
}
.card__title {
  margin-top: 0.55em;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  line-height: 1.45;
}
.card__meta {
  margin-top: 0.7em;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}
.card--row { display: grid; gap: clamp(14px, 2vw, 28px); align-items: center; }
@media (min-width: 840px) {
  .card--row { grid-template-columns: 104px minmax(0, 1fr) auto; }
}

/* ---------- 7. 图片容器（供页面阶段放置图片） ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(22, 41, 74, 0.95), rgba(10, 22, 40, 0.95));
}
.media > img,
.media > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--wide { aspect-ratio: 21 / 9; }

.media__badge {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 0.35em 0.85em;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gold);
  background: rgba(10, 22, 40, 0.92);
  border-top: 1px solid var(--signal);
  border-right: 1px solid var(--line);
}
.media__caption {
  margin-top: 0.6em;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 8. 面包屑 ---------- */
.breadcrumb { margin-top: clamp(18px, 2.6vw, 30px); }
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}
.breadcrumb__item { display: inline-flex; align-items: center; gap: 0.5em; }
.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--line-strong);
}
.breadcrumb__link { color: var(--muted); border-bottom: 1px solid transparent; }
.breadcrumb__link:hover { color: var(--cyan); border-bottom-color: var(--cyan); }
.breadcrumb__current { color: var(--paper); }

/* ---------- 9. 筛选条与复制 / 返回顶部 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.filter-chip {
  padding: 0.42em 0.95em;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease),
    background-color 0.2s var(--ease);
}
.filter-chip:hover { color: var(--cyan); border-color: var(--cyan); }
.filter-chip[aria-pressed="true"] {
  color: var(--ink-900);
  background: var(--signal);
  border-color: var(--signal);
}

[data-hidden] { display: none !important; }

.copy-chip {
  padding: 0.2em 0.6em;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
  background: transparent;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.copy-chip:hover { color: var(--cyan); border-color: var(--cyan); }
.copy-chip[data-copied="true"] { color: var(--gold); border-color: var(--line-gold); }

.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 32px);
  bottom: clamp(14px, 3vw, 32px);
  z-index: 65;
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.6em 1em;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--paper);
  background: rgba(17, 34, 64, 0.94);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease),
    border-color 0.2s var(--ease), color 0.2s var(--ease);
}
.to-top[data-visible] { opacity: 1; visibility: visible; transform: translateY(0); }
.to-top:hover { color: var(--signal); border-color: var(--signal); }

/* ---------- 10. 页头 ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  padding: 0.6em 1em;
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--ink-900);
  background: var(--gold);
}
.skip-link:focus { left: 12px; top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 70;
  background: rgba(10, 22, 40, 0.94);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--cyan), var(--signal));
  transition: width 0.12s linear;
}

.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 10px;
  padding: clamp(12px, 1.8vw, 20px) 0;
}
.masthead__slot { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.masthead__slot--batch { justify-self: start; }
.masthead__slot--region { justify-self: end; align-items: flex-end; }

.batch-code {
  font-size: 13px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.1em;
  white-space: nowrap;
  text-shadow: 0 0 12px rgba(240, 180, 41, 0.28);
}

.masthead__brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 0 clamp(6px, 2vw, 26px);
  text-align: center;
}
.masthead__brand-cn {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.9vw, 32px);
  font-weight: 900;
  letter-spacing: 0.1em;
  color: var(--paper);
  padding: 0.14em 0.5em;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.masthead__brand:hover .masthead__brand-cn {
  color: var(--cyan);
  border-color: var(--line-cyan);
}
.masthead__brand-en {
  font-size: 10px;
  letter-spacing: 0.34em;
  color: var(--muted);
}

.region-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  padding: 0.26em 0.62em;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--cyan);
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius);
  white-space: nowrap;
}
.region-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(0, 229, 195, 0.16);
}

.nav-bar {
  border-top: 1px solid var(--line);
  background: rgba(17, 34, 64, 0.55);
}
.nav-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 54px;
}

.site-nav { flex: 1 1 auto; display: flex; justify-content: center; }
.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: clamp(4px, 1.6vw, 20px);
}
.site-nav__link {
  display: inline-block;
  padding: 0.55em 0.72em;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: #B9C6DC;
  border-bottom: 2px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease),
    background-color 0.2s var(--ease);
}
.site-nav__link:hover { color: var(--cyan); border-bottom-color: var(--signal); }
.site-nav__link[aria-current="page"] {
  color: var(--paper);
  border-bottom-color: var(--signal);
  background: rgba(255, 107, 53, 0.1);
}
.site-nav__meta {
  display: none;
  margin-top: 10px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55em;
  padding: 0.5em 0.85em;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--paper);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.nav-toggle:hover { color: var(--signal); border-color: var(--signal); }
.nav-toggle__bars { display: inline-flex; flex-direction: column; gap: 3px; }
.nav-toggle__bar {
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }
  .nav-bar__inner { flex-wrap: wrap; padding-top: 8px; padding-bottom: 8px; }
  .site-nav {
    order: 2;
    flex: 1 1 100%;
    display: block;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.28s var(--ease);
  }
  .site-nav[data-open] { max-height: min(70vh, 520px); overflow-y: auto; }
  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-bottom: 12px;
  }
  .site-nav__link {
    display: block;
    padding: 0.85em 0.2em;
    letter-spacing: 0.18em;
    border-bottom: 1px solid var(--line);
  }
  .site-nav__link[aria-current="page"] { background: transparent; border-bottom-color: var(--signal); }
  .site-nav__meta { display: block; }
}

/* ---------- 11. 页脚 ---------- */
.site-footer {
  margin-top: clamp(60px, 9vw, 124px);
  background: linear-gradient(180deg, #0C1B31 0%, #08111F 100%);
  border-top: 1px solid var(--gold);
}

.footer-batch {
  padding: 14px 0;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.3em;
  text-align: center;
  text-transform: uppercase;
  color: var(--gold);
  white-space: nowrap;
  overflow: hidden;
  border-bottom: 1px dashed var(--line);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 44px);
  padding: clamp(32px, 5vw, 60px) 0;
}
@media (min-width: 720px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-col--brand { grid-column: 1 / -1; }
}
@media (min-width: 1024px) {
  .footer-grid { grid-template-columns: 1.5fr 1fr 1.35fr 0.9fr; }
  .footer-col--brand { grid-column: auto; }
}

.footer-col { min-width: 0; }
.footer-col__title {
  margin-bottom: 14px;
  padding-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.footer-brand {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 0.1em;
  color: var(--paper);
  transition: color 0.2s var(--ease);
}
.footer-brand:hover { color: var(--cyan); }
.footer-brand__line {
  margin-top: 10px;
  max-width: 36ch;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--muted);
}

.footer-list { display: flex; flex-direction: column; gap: 10px; }
.footer-list a {
  display: inline-block;
  font-size: 14.5px;
  color: #C2CFE3;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.footer-list a:hover { color: var(--cyan); border-bottom-color: var(--cyan); }

.footer-contact { display: grid; gap: 12px; }
.footer-contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5em;
  font-size: 14px;
}
.footer-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}
.footer-value { color: #C2CFE3; word-break: break-word; }
.footer-value.mono { font-size: 13px; color: var(--gold); }

.footer-note {
  font-size: 13px;
  line-height: 1.9;
  color: var(--muted);
}
.footer-note.mono { color: #B9C6DC; letter-spacing: 0.14em; }

.footer-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  padding: 18px 0 28px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

/* ---------- 12. 无障碍与动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto !important; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}