/* ==========================================================================
   XBET品牌 · 站点共享样式 /assets/site.css
   高原夜航体系 · 非对称编辑部版式
   ========================================================================== */

/* ---------- 1. 重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd,
ul, ol { margin: 0; }

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

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

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

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

main { display: block; }

/* ---------- 2. 变量 ---------- */
:root {
  /* 色板 */
  --night: #0B1B33;
  --deep: #142C4E;
  --gold: #E3A93C;
  --orange: #F1804A;
  --pulu: #B4413F;
  --snow: #F2F5F8;
  --rice: #EFE8DA;
  --rock: #8E97A3;
  --moss: #4F7A63;
  --clay: #A65E3F;

  /* 派生 */
  --line: rgba(142, 151, 163, 0.22);
  --line-strong: rgba(142, 151, 163, 0.4);
  --glass: rgba(242, 245, 248, 0.08);
  --glass-hover: rgba(242, 245, 248, 0.16);
  --deep-lift: #17335A;

  /* 字体 */
  --f-display: "PingFang SC", "Noto Sans SC", "HarmonyOS Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --f-body: "Noto Sans SC", "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --f-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;

  /* 字号阶梯 56/40/32/24/18/16/14/13 */
  --fs-56: 56px;
  --fs-40: 40px;
  --fs-32: 32px;
  --fs-24: 24px;
  --fs-18: 18px;
  --fs-16: 16px;
  --fs-14: 14px;
  --fs-13: 13px;

  /* 结构 */
  --shell: 1440px;
  --gutter: 32px;
  --header-h: 76px;
  --header-h-sm: 56px;
  --radius: 2px;

  /* 动效 */
  --t-fast: 180ms ease;
  --t-base: 240ms ease;
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--night);
  background-image:
    radial-gradient(120% 60% at 85% -10%, rgba(227, 169, 60, 0.10), transparent 62%),
    radial-gradient(90% 50% at 5% 0%, rgba(79, 122, 99, 0.10), transparent 60%);
  background-repeat: no-repeat;
  color: var(--snow);
  font-family: var(--f-body);
  font-size: var(--fs-16);
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--f-display);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 0.03em;
  color: var(--snow);
}

h1 { font-size: var(--fs-56); }
h2 { font-size: var(--fs-40); }
h3 { font-size: var(--fs-32); }
h4 { font-size: var(--fs-24); }
h5 { font-size: var(--fs-18); }

p { max-width: 74ch; }

strong { font-weight: 700; color: var(--snow); }

hr {
  border: none;
  height: 1px;
  background: var(--line);
  margin: 0;
}

::selection {
  background: var(--gold);
  color: var(--night);
}

/* ---------- 4. 焦点与可访问 ---------- */
:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
  border-radius: var(--radius);
}

.visually-hidden {
  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;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 300;
  padding: 12px 22px;
  background: var(--gold);
  color: var(--night);
  font-family: var(--f-display);
  font-weight: 700;
  font-size: var(--fs-14);
  letter-spacing: 0.04em;
  border-radius: var(--radius);
  transition: top var(--t-fast);
}

.skip-link:focus {
  top: 14px;
  outline: 2px solid var(--snow);
  outline-offset: 2px;
}

/* ---------- 5. 通用工具 ---------- */
.container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow { max-width: 880px; }

.mono {
  font-family: var(--f-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--f-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.16em;
  color: var(--gold);
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: currentColor;
  opacity: 0.75;
}

.rule {
  height: 1px;
  background: var(--line);
  border: none;
  margin: 0;
}

.rule--tick {
  height: 3px;
  background: linear-gradient(90deg, var(--clay) 0%, var(--orange) 42%, var(--gold) 72%, transparent 100%);
}

.surface-light {
  background: var(--rice);
  color: var(--night);
}

.surface-light h1,
.surface-light h2,
.surface-light h3,
.surface-light h4 { color: var(--night); }

.surface-light a { color: var(--pulu); }

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  min-width: 44px;
  padding: 11px 22px;
  font-family: var(--f-display);
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.05em;
  line-height: 1.2;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background var(--t-fast), color var(--t-fast),
              border-color var(--t-fast), box-shadow var(--t-fast);
}

.btn--primary {
  background: var(--gold);
  color: var(--night);
}

.btn--primary:hover {
  background: #F0BC5C;
  box-shadow: 0 0 0 1px rgba(227, 169, 60, 0.5);
}

.btn--ghost {
  background: transparent;
  color: var(--snow);
  border-color: rgba(242, 245, 248, 0.28);
}

.btn--ghost:hover {
  color: var(--orange);
  border-color: var(--orange);
}

.btn--quiet {
  background: var(--glass);
  color: var(--snow);
  border-color: var(--line);
}

.btn--quiet:hover {
  background: var(--glass-hover);
  border-color: var(--line-strong);
}

/* ---------- 7. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 22px;
  font-family: var(--f-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.06em;
  color: var(--rock);
}

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

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

.breadcrumb a {
  color: var(--rock);
  transition: color var(--t-fast);
}

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

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

/* ---------- 8. 章节节奏 ---------- */
.section { padding-block: 96px; }
.section--tight { padding-block: 64px; }
.section--loose { padding-block: 128px; }

.section__head {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 48px;
  max-width: 68ch;
}

.section__head p {
  color: var(--rock);
  font-size: var(--fs-16);
}

/* ---------- 9. 网格 ---------- */
.grid {
  display: grid;
  gap: 24px;
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.grid--editorial {
  grid-template-columns: minmax(0, 3fr) minmax(0, 7fr);
  gap: 48px;
}

.grid--stagger > *:nth-child(2n) { transform: translateY(32px); }
.grid--stagger > *:nth-child(3n) { transform: translateY(-18px); }

/* ---------- 10. 卡片 ---------- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 28px;
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: transform var(--t-fast), background var(--t-fast), border-color var(--t-fast);
}

.card:hover {
  transform: translateY(-4px);
  background: var(--glass-hover);
  border-color: var(--line-strong);
}

.card:focus-within {
  border-color: var(--orange);
}

.card--solid {
  background: var(--deep);
  border-color: rgba(142, 151, 163, 0.3);
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
}

.card--solid:hover {
  background: var(--deep-lift);
  transform: translateY(-4px);
}

.card__index {
  font-family: var(--f-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.1em;
  color: var(--gold);
}

.card__title {
  font-family: var(--f-display);
  font-size: var(--fs-24);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.3;
}

.card__body {
  color: var(--rock);
  font-size: var(--fs-14);
  line-height: 1.75;
}

.card--accent-gold { border-left: 3px solid var(--gold); }
.card--accent-orange { border-left: 3px solid var(--orange); }
.card--accent-moss { border-left: 3px solid var(--moss); }
.card--accent-clay { border-left: 3px solid var(--clay); }

/* ---------- 11. 图片容器 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--night);
  background-image:
    radial-gradient(120% 90% at 82% 0%, rgba(227, 169, 60, 0.16), transparent 62%),
    linear-gradient(150deg, #17335A 0%, #0B1B33 100%);
}

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

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(242, 245, 248, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(242, 245, 248, 0.055) 1px, transparent 1px);
  background-size: 56px 56px;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }
.media--plain::after { display: none; }

.media__caption {
  display: block;
  margin-top: 10px;
  font-family: var(--f-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.04em;
  color: var(--rock);
}

/* ---------- 12. 显现 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--t-base), transform var(--t-base);
}

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

/* ---------- 13. 滚动进度 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 2px;
  z-index: 200;
  pointer-events: none;
  background: linear-gradient(90deg, var(--gold) 0%, var(--orange) 100%);
  transition: width 80ms linear;
}

/* ==========================================================================
   14. 命令栏头部
   ========================================================================== */
.cmd-bar {
  position: sticky;
  top: 0;
  z-index: 120;
  background: rgba(11, 27, 51, 0.88);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--line);
  transition: background var(--t-base), border-color var(--t-base);
}

.cmd-bar.is-condensed {
  background: rgba(11, 27, 51, 0.97);
  border-bottom-color: var(--line-strong);
}

.cmd-bar__inner {
  display: flex;
  align-items: center;
  gap: 18px;
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
  height: var(--header-h);
  transition: height var(--t-base);
}

.cmd-bar.is-condensed .cmd-bar__inner { height: var(--header-h-sm); }

/* 品牌 */
.cmd-bar__brand {
  display: flex;
  flex-direction: column;
  gap: 1px;
  flex: 0 0 auto;
  padding-right: 20px;
  line-height: 1.25;
  border-right: 1px solid var(--line);
  transition: border-color var(--t-fast);
}

.cmd-bar__brand:hover .cmd-bar__brand-mark { color: var(--gold); }

.cmd-bar__brand-mark {
  font-family: var(--f-display);
  font-size: var(--fs-18);
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--snow);
  transition: color var(--t-fast);
}

.cmd-bar__sig {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--rock);
}

/* 导航 */
.cmd-bar__nav {
  display: flex;
  align-items: stretch;
  height: 100%;
  margin-left: auto;
}

.cmd-bar__link {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1px;
  min-height: 44px;
  padding: 8px 13px;
  font-size: var(--fs-14);
  line-height: 1.3;
  color: var(--rock);
  border-left: 2px solid transparent;
  transition: color var(--t-fast), background var(--t-fast), border-color var(--t-fast);
}

.cmd-bar__idx {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  opacity: 0.72;
}

.cmd-bar__name { white-space: nowrap; }

.cmd-bar__link:hover {
  color: var(--snow);
  background: var(--glass);
}

.cmd-bar__link[aria-current="page"] {
  color: var(--gold);
  border-left-color: var(--gold);
  background: linear-gradient(90deg, rgba(227, 169, 60, 0.14), transparent 72%);
}

.cmd-bar__link[aria-current="page"] .cmd-bar__idx { opacity: 1; }

.cmd-bar__cta {
  flex: 0 0 auto;
  margin-left: 14px;
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  min-width: 44px;
  min-height: 44px;
  margin-left: auto;
  padding: 10px 12px;
  background: transparent;
  color: var(--snow);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color var(--t-fast), background var(--t-fast);
}

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

.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 18px;
  height: 14px;
}

.nav-toggle__bars span {
  display: block;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform var(--t-fast), opacity var(--t-fast);
}

.nav-toggle__text {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ==========================================================================
   15. 页脚
   ========================================================================== */
.site-foot {
  position: relative;
  background: var(--deep);
  border-top: 1px solid var(--line);
  color: var(--snow);
  font-size: var(--fs-14);
}

.site-foot::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg,
    var(--clay) 0 25%,
    var(--pulu) 25% 50%,
    var(--orange) 50% 75%,
    var(--gold) 75% 100%);
  opacity: 0.85;
}

.foot-band { border-bottom: 1px solid rgba(142, 151, 163, 0.16); }
.foot-band:last-child { border-bottom: none; }

.foot-band__inner {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 44px var(--gutter);
}

/* 第一带 */
.foot-band--index .foot-band__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.foot-brand {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.foot-brand__mark {
  font-family: var(--f-display);
  font-size: var(--fs-24);
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--snow);
}

.foot-brand__note {
  font-family: var(--f-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.06em;
  color: var(--rock);
}

.foot-index {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 22px;
}

.foot-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 0;
  color: var(--rock);
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}

.foot-index__link:hover {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.foot-index__link .mono {
  color: var(--clay);
  font-size: 12px;
}

.foot-index__link:hover .mono { color: var(--gold); }

/* 第二带 */
.foot-band--contact .foot-band__inner {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 28px 40px;
  align-items: start;
}

.foot-contact__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.foot-contact__label {
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--rock);
  text-transform: uppercase;
}

.foot-contact__value {
  font-size: var(--fs-16);
  line-height: 1.5;
  color: var(--snow);
  word-break: break-word;
}

.foot-contact__value--accent { color: var(--gold); }

.foot-contact__note {
  grid-column: 1 / -1;
  max-width: 74ch;
  margin-top: 4px;
  padding-left: 14px;
  border-left: 2px solid var(--clay);
  color: var(--rock);
  font-size: var(--fs-14);
  line-height: 1.7;
}

/* 第三带 */
.foot-band--legal .foot-band__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 32px;
  padding-block: 24px;
  color: var(--rock);
  font-size: var(--fs-13);
}

.foot-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 22px;
}

.foot-legal a {
  color: var(--rock);
  transition: color var(--t-fast);
}

.foot-legal a:hover { color: var(--gold); }

.foot-meta {
  font-family: var(--f-mono);
  letter-spacing: 0.04em;
  max-width: none;
}

/* ==========================================================================
   16. 响应式
   ========================================================================== */
@media (max-width: 1180px) {
  .cmd-bar__link { padding: 8px 9px; font-size: var(--fs-13); }
  .cmd-bar__brand { padding-right: 14px; }
  .grid--editorial { gap: 32px; }
}

@media (max-width: 1023px) {
  .nav-toggle { display: inline-flex; }

  .cmd-bar__nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    z-index: 118;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    height: auto;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    margin-left: 0;
    padding: 8px var(--gutter) 28px;
    background: rgba(11, 27, 51, 0.98);
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line-strong);
    transform: translateY(-10px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--t-base), transform var(--t-base), visibility var(--t-base);
  }

  .cmd-bar.is-condensed .cmd-bar__nav { top: var(--header-h-sm); }

  .cmd-bar__nav[data-open] {
    transform: none;
    opacity: 1;
    visibility: visible;
  }

  .cmd-bar__link {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 14px;
    min-height: 52px;
    padding: 14px 12px;
    font-size: var(--fs-16);
    border-left: 2px solid transparent;
    border-bottom: 1px solid rgba(142, 151, 163, 0.12);
  }

  .cmd-bar__link[aria-current="page"] {
    background: linear-gradient(90deg, rgba(227, 169, 60, 0.16), transparent 64%);
  }

  .cmd-bar__cta {
    margin-left: 0;
    padding-inline: 14px;
    font-size: var(--fs-13);
  }

  .grid--editorial { grid-template-columns: 1fr; gap: 32px; }
  .grid--3,
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--stagger > *:nth-child(2n),
  .grid--stagger > *:nth-child(3n) { transform: none; }

  .section { padding-block: 76px; }
  .section--loose { padding-block: 96px; }
}

@media (max-width: 640px) {
  :root {
    --gutter: 20px;
    --header-h: 64px;
    --header-h-sm: 52px;
    --fs-56: 34px;
    --fs-40: 28px;
    --fs-32: 24px;
    --fs-24: 20px;
  }

  body { font-size: var(--fs-16); line-height: 1.72; }

  .cmd-bar__brand { padding-right: 0; border-right: none; }
  .cmd-bar__sig { display: none; }
  .cmd-bar__brand-mark { font-size: var(--fs-16); }
  .cmd-bar__cta { padding: 10px 12px; }

  .nav-toggle__text { display: none; }

  .foot-band__inner { padding: 32px var(--gutter); }
  .foot-brand__mark { font-size: var(--fs-18); }
  .foot-band--legal .foot-band__inner { padding-block: 20px; }

  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: 1fr; }
  .grid { gap: 18px; }

  .section { padding-block: 56px; }
  .section--loose { padding-block: 72px; }
  .section__head { margin-bottom: 32px; }

  .card { padding: 22px; }

  .media { aspect-ratio: 4 / 3; }
  .media--wide { aspect-ratio: 16 / 9; }
}

@media (max-width: 400px) {
  .cmd-bar__cta { font-size: 12px; padding: 10px 10px; letter-spacing: 0.02em; }
}

/* ==========================================================================
   17. 降低动效
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  .card:hover,
  .card--solid:hover {
    transform: none;
  }

  .grid--stagger > * { transform: none !important; }
}