/* ============================================================
   博亚娱乐馆 · /assets/site.css
   共享外壳：reset / tokens / 头部侧边轨道导航 / 页脚 / 通用组件
   ============================================================ */

/* ---------- 1. Reset ---------- */
*, *::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; padding: 0; }
ul, ol { list-style: none; }
img, picture, svg, video { display: block; max-width: 100%; height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; }

/* ---------- 2. Tokens ---------- */
:root {
  --sea: #123A5E;
  --sea-deep: #0C2A45;
  --ink: #0B1F33;
  --coral: #FF6B4A;
  --coral-deep: #C8462E;
  --coral-press: #AE3A24;
  --paper: #FBF6EC;
  --card: #F3EADB;
  --pearl: #FFFFFF;
  --jade: #1FA37A;
  --mist: #D6E1EA;
  --slate: #5A6B7B;
  --line: #1B2D3F;

  --rail-w: 92px;
  --bar-h: 64px;
  --maxw: 1200px;
  --maxw-wide: 1440px;
  --offset-a: 48px;
  --offset-b: 96px;

  --sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, "Times New Roman", serif;
  --mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --edge: 1px solid var(--line);
  --hair: 1px solid rgba(27, 45, 63, .22);
  --shadow-card: 0 1px 0 rgba(11, 31, 51, .05), 0 12px 26px -20px rgba(11, 31, 51, .5);
  --shadow-lift: 0 20px 38px -24px rgba(11, 31, 51, .6);
  --ease: cubic-bezier(.2, .7, .25, 1);
}

/* ---------- 3. Base typography ---------- */
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.8;
  letter-spacing: .01em;
  min-height: 100vh;
}
@media (min-width: 961px) {
  body { font-size: 17px; line-height: 1.85; }
}
h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 900;
  letter-spacing: .02em;
  line-height: 1.16;
  color: var(--ink);
}
h1 { font-size: clamp(2.2rem, 7vw, 4.2rem); line-height: 1.06; }
h2 { font-size: clamp(1.6rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 2.6vw, 1.5rem); }
h4 { font-size: 1.05rem; }
p { max-width: 42em; }
strong, b { font-weight: 700; }
::selection { background: var(--coral); color: var(--ink); }

.mono {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

:focus-visible {
  outline: 3px solid var(--coral-deep);
  outline-offset: 2px;
}
.site-header :focus-visible,
.site-footer :focus-visible,
.section--sea :focus-visible {
  outline-color: var(--coral);
}

/* ---------- 4. Skip link ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 10px;
  z-index: 200;
  transform: translateY(-160%);
  background: var(--ink);
  color: var(--pearl);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .1em;
  padding: 10px 16px;
  border: 1px solid var(--pearl);
  transition: transform 160ms var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible { transform: translateY(12px); }

/* ---------- 5. Header：移动顶栏 + 抽屉 / 桌面轨道 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--bar-h);
  background: var(--sea);
  color: var(--pearl);
  border-bottom: 1px solid rgba(255, 255, 255, .16);
  z-index: 80;
}
.site-header__inner {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 100%;
  padding: 0 14px;
}

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--pearl);
}
.brand__mark {
  flex: none;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--coral);
  color: var(--ink);
  border: 1px solid var(--ink);
  display: grid;
  place-items: center;
  font-family: var(--serif);
  font-weight: 900;
  font-size: 16px;
  line-height: 1;
}
.brand__text { display: flex; flex-direction: column; line-height: 1.25; }
.brand__name {
  font-family: var(--serif);
  font-weight: 900;
  font-size: 15px;
  letter-spacing: .06em;
  color: var(--pearl);
}
.brand__suffix {
  font-size: 10px;
  letter-spacing: .18em;
  color: #A9C2D6;
}

/* 移动菜单按钮 */
.nav-toggle {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 40px;
  padding: 9px 14px;
  border: 1px solid rgba(255, 255, 255, .5);
  color: var(--pearl);
  transition: background 140ms var(--ease), border-color 140ms var(--ease);
}
.nav-toggle:hover { background: rgba(255, 255, 255, .12); }
.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: var(--pearl);
  transition: background 160ms var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--pearl);
  transition: transform 180ms var(--ease);
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }
.nav-toggle__label {
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .14em;
}

/* 抽屉（移动 / 平板） */
.rail {
  position: fixed;
  top: var(--bar-h);
  left: 0;
  bottom: 0;
  width: min(320px, 86vw);
  display: flex;
  flex-direction: column;
  background: var(--paper);
  color: var(--ink);
  border-right: var(--edge);
  box-shadow: 26px 0 60px -30px rgba(11, 31, 51, .55);
  overflow-y: auto;
  padding-bottom: 20px;
  z-index: 90;
  transform: translateX(-103%);
  transition: transform 260ms var(--ease);
}
.rail[data-open] { transform: translateX(0); }
.rail__tagline {
  padding: 18px 18px 14px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--slate);
  border-bottom: 1px solid var(--mist);
  max-width: none;
}
.rail__list { display: flex; flex-direction: column; }
.rail__item { border-top: 1px solid var(--mist); }
.rail__item:first-child { border-top: 0; }
.rail__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 18px;
  color: var(--ink);
  transition: background 140ms var(--ease), color 140ms var(--ease);
}
.rail__idx {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--coral-deep);
}
.rail__label {
  font-size: 15px;
  font-weight: 900;
  letter-spacing: .08em;
  transition: transform 120ms var(--ease), opacity 120ms var(--ease);
}
.rail__link:hover { background: var(--card); }
.rail__link[aria-current="page"] { background: var(--mist); }
.rail__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--coral-deep);
}
.rail__foot {
  margin-top: auto;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 1px solid var(--mist);
}
.rail__batch {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--slate);
  text-align: center;
  transition: color 140ms var(--ease);
}
.rail__batch:hover { color: var(--coral-deep); }

.nav-scrim {
  position: fixed;
  inset: var(--bar-h) 0 0 0;
  background: rgba(11, 31, 51, .52);
  z-index: 85;
}
.nav-scrim[hidden] { display: none; }

@media (max-width: 960px) {
  html[data-nav-open] { overflow: hidden; }
}

/* 桌面：左侧 92px 轨道 */
@media (min-width: 961px) {
  .site-header {
    top: 0;
    left: 0;
    bottom: 0;
    right: auto;
    width: var(--rail-w);
    height: auto;
    border-bottom: 0;
    border-right: 1px solid rgba(255, 255, 255, .16);
  }
  .site-header__inner {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    height: 100%;
    padding: 0;
  }
  .brand {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 12px;
    padding: 22px 8px 20px;
  }
  .brand__mark { width: 42px; height: 42px; font-size: 19px; }
  .brand__text { align-items: center; gap: 8px; }
  .brand__name { writing-mode: vertical-rl; font-size: 15px; letter-spacing: .18em; }
  .brand__suffix { writing-mode: vertical-rl; font-size: 9.5px; letter-spacing: .2em; }

  .nav-toggle { display: none; }

  .rail {
    position: static;
    transform: none;
    width: auto;
    height: auto;
    flex: 1 1 auto;
    min-height: 0;
    background: transparent;
    color: var(--pearl);
    border-right: 0;
    box-shadow: none;
    overflow-y: auto;
    padding-bottom: 0;
    transition: none;
  }
  .rail[data-open] { transform: none; }
  .rail__tagline { display: none; }
  .rail__list { padding: 0; }
  .rail__item { border-top: 1px solid rgba(255, 255, 255, .12); }
  .rail__link {
    flex-direction: column;
    align-items: center;
    gap: 5px;
    padding: 14px 4px;
    color: #DCE7F0;
  }
  .rail__idx { color: #7FA3C0; font-size: 10px; }
  .rail__label {
    font-size: 12.5px;
    letter-spacing: .08em;
    opacity: .72;
    transform: translateX(-4px);
  }
  .rail__link:hover { background: rgba(255, 255, 255, .08); color: var(--pearl); }
  .rail__link:hover .rail__label { opacity: 1; transform: translateX(0); }
  .rail__link[aria-current="page"] { background: rgba(255, 255, 255, .12); color: var(--pearl); }
  .rail__link[aria-current="page"] .rail__label { opacity: 1; transform: none; }

  .rail__foot {
    margin-top: auto;
    padding: 14px 8px 18px;
    border-top: 1px solid rgba(255, 255, 255, .16);
  }
  .rail__batch { color: #9DB9CE; }
  .rail__batch:hover { color: var(--coral); }

  .nav-scrim { display: none; }

  .btn--outline-light {
    border-color: rgba(255, 255, 255, .55);
    color: var(--pearl);
    background: transparent;
  }
  .btn--outline-light:hover { background: rgba(255, 255, 255, .14); }
}

/* ---------- 6. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 1px solid var(--line);
  background: var(--pearl);
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .08em;
  line-height: 1.3;
  transition: transform 140ms var(--ease), background 140ms var(--ease),
              color 140ms var(--ease), border-color 140ms var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn--cta {
  background: var(--coral-deep);
  border-color: var(--coral-deep);
  color: var(--pearl);
}
.btn--cta:hover { background: var(--coral-press); border-color: var(--coral-press); }
.btn--ghost {
  background: transparent;
  border-color: var(--sea);
  color: var(--sea);
}
.btn--ghost:hover { background: var(--sea); color: var(--pearl); }
.btn--outline-light {
  background: transparent;
  border-color: var(--sea);
  color: var(--sea);
}
.btn--outline-light:hover { background: var(--sea); color: var(--pearl); }
.btn--block { display: flex; width: 100%; }
.btn--rail {
  font-size: 12px;
  padding: 9px 4px;
  letter-spacing: .06em;
  line-height: 1.35;
  text-align: center;
}

/* ---------- 7. Footer ---------- */
.site-footer {
  background: var(--sea);
  color: #CFDCE8;
  border-top: 4px solid var(--coral-deep);
  padding: 56px 20px 28px;
}
.site-footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}
.footer-brand { display: flex; flex-direction: column; gap: 10px; align-items: flex-start; }
.footer-brand__name {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: .08em;
  color: var(--pearl);
  border-bottom: 1px solid rgba(255, 255, 255, .28);
  padding-bottom: 8px;
  transition: border-color 140ms var(--ease);
}
.footer-brand__name:hover { border-color: var(--coral); }
.footer-brand__suffix { font-size: 11px; letter-spacing: .18em; color: #8FB0C9; max-width: none; }
.footer-brand__meta {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: #8FB0C9;
  max-width: none;
}
.footer-cols { display: grid; grid-template-columns: 1fr; gap: 28px; }
.footer-col__title {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: .16em;
  color: var(--pearl);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, .2);
}
.footer-col__list { display: flex; flex-direction: column; gap: 9px; }
.footer-link {
  font-size: 14px;
  color: #CFDCE8;
  transition: color 140ms var(--ease), padding-left 140ms var(--ease);
}
.footer-link:hover { color: var(--coral); padding-left: 4px; }

.footer-contact { display: block; }
.contact-list { display: flex; flex-direction: column; gap: 12px; }
.contact-list__item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}
.contact-list__key {
  font-size: 11px;
  letter-spacing: .14em;
  color: #8FB0C9;
  min-width: 62px;
}
.contact-list__val {
  font-size: 13px;
  color: var(--pearl);
}
.copy-btn {
  font-size: 11px;
  letter-spacing: .1em;
  padding: 5px 10px;
  border: 1px solid rgba(255, 255, 255, .4);
  color: #CFDCE8;
  transition: background 140ms var(--ease), color 140ms var(--ease),
              border-color 140ms var(--ease);
}
.copy-btn:hover { background: rgba(255, 255, 255, .14); color: var(--pearl); }
.copy-btn.is-copied {
  background: var(--jade);
  border-color: var(--jade);
  color: var(--pearl);
}

.site-footer__legal {
  max-width: var(--maxw);
  margin: 40px auto 0;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, .18);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.legal-line {
  font-size: 12.5px;
  line-height: 1.8;
  color: #A9C2D6;
  max-width: none;
}
.legal-note {
  font-size: 12px;
  letter-spacing: .02em;
  color: #8FB0C9;
  max-width: none;
}

@media (min-width: 641px) {
  .footer-cols { grid-template-columns: repeat(3, 1fr); gap: 32px; }
}
@media (min-width: 961px) {
  .site-footer { padding: 76px 48px 36px; margin-left: var(--rail-w); }
  .site-footer__inner {
    grid-template-columns: 1.05fr 2fr 1.25fr;
    gap: 56px;
    align-items: start;
  }
  .footer-cols { gap: 36px; }
}

/* ---------- 8. 内容区偏移 ---------- */
main { padding-top: var(--bar-h); }
#main-content { display: block; scroll-margin-top: 84px; }
@media (min-width: 961px) {
  main { padding-top: 0; padding-left: var(--rail-w); }
}

/* ---------- 9. 版面与栅格 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}
.container--wide { max-width: var(--maxw-wide); }
@media (min-width: 961px) {
  .container { padding: 0 40px; }
}

.section { padding: 64px 0; }
.section--tight { padding: 40px 0; }
.section--card { background: var(--card); }
.section--tint { background: var(--mist); }
.section--sea { background: var(--sea); color: #DCE7F0; }
.section--sea h1,
.section--sea h2,
.section--sea h3 { color: var(--pearl); }
@media (min-width: 961px) {
  .section { padding: 112px 0; }
  .section--tight { padding: 64px 0; }
}

.grid { display: grid; grid-template-columns: 1fr; gap: 24px; }
@media (min-width: 641px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 961px) {
  .grid { gap: 32px; }
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
}

/* ---------- 10. 组件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 12px;
  background: var(--pearl);
  border: var(--edge);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: .14em;
  color: var(--sea);
}
.roundel {
  flex: none;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--sea);
  color: var(--pearl);
  border: var(--edge);
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: .02em;
}
.roundel--coral { background: var(--coral-deep); border-color: var(--coral-deep); }
.roundel--jade { background: var(--jade); border-color: var(--jade); }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 10px;
  background: var(--mist);
  border: var(--edge);
  color: var(--sea);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
}
.chip--coral {
  background: var(--coral-deep);
  border-color: var(--coral-deep);
  color: var(--pearl);
}
.chip--jade {
  background: transparent;
  border-color: var(--jade);
  color: var(--jade);
}

.card {
  background: var(--card);
  border: var(--edge);
  padding: 24px;
  box-shadow: var(--shadow-card);
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease),
              border-color 180ms var(--ease);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
  border-color: var(--sea);
}
.card__title {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 900;
  margin-bottom: 8px;
}
.card__meta {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--slate);
}
.card--paper { background: var(--pearl); }
.card--sea { background: var(--sea); border-color: var(--sea); color: #DCE7F0; }
.card--sea .card__title { color: var(--pearl); }
.card--sea .card__meta { color: #8FB0C9; }

.prose { max-width: 44rem; }
.prose > * + * { margin-top: 1.1em; }
.prose h2 { margin-top: 2.2em; }
.prose h3 { margin-top: 1.8em; }
.prose ul { display: flex; flex-direction: column; gap: 8px; }
.prose ul li { position: relative; padding-left: 1.2em; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 9px;
  height: 1px;
  background: var(--coral-deep);
}
.prose ol { list-style: decimal; padding-left: 1.4em; display: flex; flex-direction: column; gap: 8px; }
.prose a { color: var(--coral-deep); border-bottom: 1px solid currentColor; }
.prose blockquote {
  border-left: 4px solid var(--coral-deep);
  padding: 4px 0 4px 18px;
  color: var(--slate);
  font-family: var(--serif);
  font-size: 1.05rem;
}

.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: var(--edge);
  background:
    radial-gradient(120% 120% at 12% 18%, rgba(255, 107, 74, .55) 0%, rgba(255, 107, 74, 0) 55%),
    linear-gradient(135deg, var(--sea) 0%, #1B4A73 52%, var(--mist) 100%);
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(255, 255, 255, .32);
  pointer-events: none;
}
.media-frame img { width: 100%; height: 100%; object-fit: cover; }
.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--wide { aspect-ratio: 21 / 9; }

.figcap {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--slate);
  max-width: none;
}

.breadcrumbs { padding: 18px 0 0; }
.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--slate);
}
.breadcrumbs__item { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumbs__link { color: var(--slate); transition: color 140ms var(--ease); }
.breadcrumbs__link:hover { color: var(--coral-deep); }
.breadcrumbs__sep { color: var(--slate); opacity: .55; }
.breadcrumbs [aria-current="page"] { color: var(--sea); font-weight: 700; }

.rule { height: 1px; background: var(--line); opacity: .25; }

/* ---------- 11. 显现动效 ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 620ms var(--ease), transform 620ms var(--ease);
}
html.js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

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