/* ============================================================
   皇官方版口服 · /assets/site.css
   共享层：reset / 变量 / 中文排版 / 头部 / 页脚 / 通用组件
   ============================================================ */

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
html:focus-within { scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { max-width: 100%; display: block; }
button { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }
[id] { scroll-margin-top: 7rem; }

/* ---------- 变量 ---------- */
:root {
  --ink: #0E1114;
  --ink-2: #1B2026;
  --ink-3: #232A31;
  --gold: #C9A24D;
  --gold-soft: #E7CE93;
  --cinnabar: #C0392B;
  --celadon: #5F8F7C;
  --paper: #F3EDE2;
  --paper-2: #E7DECD;
  --white: #FBFAF7;
  --graphite: #4A5058;
  --steel: #7C8794;
  --text-ink: #D9D3C7;
  --line: rgba(231, 206, 147, .20);
  --line-strong: rgba(231, 206, 147, .44);
  --line-dark: rgba(14, 17, 20, .14);
  --glass: rgba(243, 237, 226, .055);

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

  --step--1: 0.8125rem;
  --step-0: 1rem;
  --step-1: 1.125rem;
  --step-2: 1.375rem;
  --step-3: 1.75rem;
  --step-4: 2.25rem;
  --step-5: 3rem;
  --step-6: clamp(2.75rem, 5.4vw, 4.5rem);

  --gutter: clamp(1rem, 4vw, 2.5rem);
  --wrap: 1240px;
  --gap: clamp(1rem, 2.4vw, 2rem);
  --ease: cubic-bezier(.2, .7, .2, 1);
  --shadow: 0 18px 40px rgba(0, 0, 0, .38);
}

/* ---------- 中文排版与基础 ---------- */
body {
  background: var(--ink);
  color: var(--text-ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.75;
  letter-spacing: .01em;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 800;
  color: var(--white);
  line-height: 1.18;
  letter-spacing: -.01em;
  text-wrap: balance;
}
h1 { font-size: var(--step-6); }
h2 { font-size: var(--step-4); }
h3 { font-size: var(--step-3); }
h4 { font-size: var(--step-2); }
strong { color: var(--white); font-weight: 700; }
::selection { background: rgba(201, 162, 77, .3); color: var(--white); }

:focus-visible {
  outline: 2px solid var(--gold-soft);
  outline-offset: 3px;
}

/* ---------- 布局 ---------- */
.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: clamp(3rem, 7vw, 6rem); border-top: 1px solid var(--line); }
.section--ink-2 { background: var(--ink-2); }
.section--glass { background: var(--glass); backdrop-filter: blur(6px); }
.section--paper { background: var(--paper); color: var(--graphite); }
.section--paper :is(h1, h2, h3, h4) { color: var(--ink); }
.section--paper a { color: #1F4E3F; }
.section--paper .mono,
.section--paper .eyebrow { color: #7A5C13; }

.grid { display: grid; gap: var(--gap); grid-template-columns: repeat(12, minmax(0, 1fr)); }
.grid > * { grid-column: span 12; min-width: 0; }
.grid > .col-2 { grid-column: span 2; }
.grid > .col-3 { grid-column: span 3; }
.grid > .col-4 { grid-column: span 4; }
.grid > .col-5 { grid-column: span 5; }
.grid > .col-6 { grid-column: span 6; }
.grid > .col-7 { grid-column: span 7; }
.grid > .col-8 { grid-column: span 8; }
.grid > .col-9 { grid-column: span 9; }
.grid > .col-10 { grid-column: span 10; }
.grid > .col-12 { grid-column: span 12; }

.stack { display: grid; gap: var(--gap); }
.cluster { display: flex; flex-wrap: wrap; gap: .75rem; align-items: center; }

/* ---------- 标注与图形元素 ---------- */
.mono {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--steel);
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gold);
}
.eyebrow::before { content: ""; width: 28px; height: 1px; background: currentColor; opacity: .75; }
.index-num { font-family: var(--font-mono); font-size: var(--step--1); letter-spacing: .16em; color: var(--gold); }
.lede { font-size: var(--step-2); line-height: 1.6; color: var(--text-ink); max-width: 34ch; }
.rule { height: 1px; border: 0; background: linear-gradient(90deg, var(--line-strong), transparent); }
.v-note {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gold);
  opacity: .85;
}
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 标签 / 按钮 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .25rem .55rem;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  border: 1px solid var(--line-strong);
  color: var(--gold-soft);
  white-space: nowrap;
}
.tag--official { border-color: rgba(201, 162, 77, .6); color: var(--gold-soft); background: rgba(201, 162, 77, .1); }
.tag--current { border-color: rgba(192, 57, 43, .6); color: #E38A7E; background: rgba(192, 57, 43, .12); }
.tag--legacy { border-color: rgba(95, 143, 124, .6); color: #93BCAA; background: rgba(95, 143, 124, .12); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .72rem 1.15rem;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--gold-soft);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .12em;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform .18s var(--ease), background-color .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}
.btn:hover { transform: translateY(-2px); border-color: var(--gold); color: var(--white); background: rgba(201, 162, 77, .12); }
.btn--ghost { background: transparent; }
.btn--gold { background: var(--gold); border-color: var(--gold); color: var(--ink); }
.btn--gold:hover { background: var(--gold-soft); border-color: var(--gold-soft); color: var(--ink); }
.btn--sm { padding: .45rem .8rem; font-size: .75rem; }
.btn--block { width: 100%; }

/* ---------- 头部 ---------- */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -4.5rem;
  z-index: 100;
  padding: .65rem 1rem;
  background: var(--gold);
  color: var(--ink);
  font-size: .875rem;
  letter-spacing: .08em;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 1rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--ink);
  border-bottom: 1px solid var(--line-strong);
}
.header-top { background: var(--ink); border-bottom: 1px solid var(--line); }
.header-top__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: .7rem;
}
.brand { display: inline-flex; align-items: center; gap: .75rem; }
.brand__mark {
  display: grid;
  place-items: center;
  width: 2.3rem;
  height: 2.3rem;
  border: 1px solid var(--line-strong);
  color: var(--gold);
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.125rem;
  flex: none;
}
.brand__text { display: flex; flex-direction: column; line-height: 1.25; }
.brand__name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.0625rem;
  letter-spacing: .02em;
  color: var(--white);
}
.brand__desc {
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--steel);
}
.header-note {
  display: flex;
  align-items: center;
  gap: .9rem;
  font-size: var(--step--1);
  color: var(--steel);
}
.header-note__mail { font-family: var(--font-mono); color: var(--gold-soft); letter-spacing: .04em; }
.header-note__time { white-space: nowrap; }

.header-main { background: var(--ink-2); }
.header-main__inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-block: .4rem;
}
.site-nav { flex: 1 1 auto; min-width: 0; }
.site-nav__list { display: flex; align-items: center; flex-wrap: wrap; gap: .15rem; }
.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: .45rem;
  padding: .8rem .85rem;
  color: var(--text-ink);
  font-size: .9375rem;
  border-bottom: 2px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}
.site-nav__idx { font-family: var(--font-mono); font-size: .6875rem; letter-spacing: .1em; color: var(--steel); }
.site-nav__link:hover { color: var(--white); border-bottom-color: var(--gold); background: rgba(201, 162, 77, .08); }
.site-nav__link:hover .site-nav__idx { color: var(--gold-soft); }
.site-nav__link[aria-current="page"] { color: var(--gold); border-bottom-color: var(--gold); }
.site-nav__link[aria-current="page"] .site-nav__idx { color: var(--gold); }

.header-side { display: flex; align-items: center; gap: .75rem; margin-left: auto; }
.version-chip {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .35rem .6rem;
  border: 1px solid rgba(95, 143, 124, .55);
  color: #93BCAA;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  white-space: nowrap;
}
.version-chip__dot { width: 6px; height: 6px; border-radius: 50%; background: var(--celadon); flex: none; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: .6rem;
  padding: .5rem .7rem;
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--gold-soft);
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  cursor: pointer;
}
.nav-toggle__bars { display: grid; gap: 3px; width: 16px; }
.nav-toggle__bars span { display: block; height: 1px; background: currentColor; }
.nav-toggle[aria-expanded="true"] { border-color: var(--gold); background: rgba(201, 162, 77, .12); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: .3; }
.nav-toggle__label { white-space: nowrap; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--ink);
  border-top: 1px solid var(--line-strong);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
  gap: var(--gap);
  padding-block: clamp(2.5rem, 5vw, 4rem);
}
.footer-col { min-width: 0; }
.footer-brand {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--white);
  letter-spacing: .02em;
}
.footer-domain { margin-top: .6rem; }
.footer-icp { margin-top: .3rem; }
.footer-note { margin-top: 1rem; font-size: .875rem; line-height: 1.7; color: var(--steel); max-width: 36ch; }
.footer-title {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: .75rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1rem;
}
.footer-list { display: grid; gap: .6rem; }
.footer-list a {
  font-size: .9375rem;
  color: var(--text-ink);
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}
.footer-list a:hover { color: var(--gold); border-bottom-color: var(--gold); }
.footer-list__idx {
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .1em;
  color: var(--steel);
  margin-right: .5rem;
}
.footer-meta { display: grid; gap: .85rem; font-size: .9375rem; color: var(--text-ink); }
.footer-meta li { display: block; word-break: break-word; }
.footer-meta__key {
  display: block;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .18em;
  color: #93BCAA;
  margin-bottom: .15rem;
}
.footer-meta__hint { font-size: .8125rem; line-height: 1.7; color: var(--steel); }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  justify-content: space-between;
  align-items: center;
  padding-block: 1.25rem;
  border-top: 1px solid var(--line);
  font-size: var(--step--1);
  color: var(--steel);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding-block: .9rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--steel);
}
.breadcrumb ol { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem; }
.breadcrumb li + li::before { content: "/"; margin-right: .5rem; color: var(--line-strong); }
.breadcrumb a:hover { color: var(--gold); }
.breadcrumb [aria-current="page"] { color: var(--gold-soft); }

/* ---------- 卡片与索引组件 ---------- */
.card {
  position: relative;
  padding: clamp(1.15rem, 2.4vw, 1.75rem);
  background: var(--ink-2);
  border: 1px solid var(--line);
  transition: transform .22s var(--ease), border-color .22s var(--ease), box-shadow .22s var(--ease);
}
.card:hover { transform: translateY(-4px); border-color: var(--gold); box-shadow: var(--shadow); }
.card--paper { background: var(--white); border-color: var(--line-dark); color: var(--graphite); }
.card--paper :is(h2, h3, h4) { color: var(--ink); }
.card__index { font-family: var(--font-mono); font-size: .75rem; letter-spacing: .16em; color: var(--gold); }
.card__title { margin-top: .5rem; font-size: var(--step-2); }
.card__text { margin-top: .5rem; font-size: .9375rem; line-height: 1.7; color: var(--steel); }
.card--paper .card__text { color: var(--graphite); }
.card__meta { margin-top: 1rem; display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; }
.card-grid {
  display: grid;
  gap: var(--gap);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 230px), 1fr));
}

.index-list { display: grid; border-top: 1px solid var(--line); }
.index-list__row {
  display: grid;
  grid-template-columns: 4rem 1fr auto;
  gap: 1rem;
  align-items: baseline;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}
.index-list__id { font-family: var(--font-mono); font-size: .75rem; letter-spacing: .1em; color: var(--gold); }
.index-list__label { color: var(--white); font-size: var(--step-1); }
.index-list__note { font-size: .875rem; color: var(--steel); }

.legend { display: grid; gap: .5rem; }
.legend__item {
  display: flex;
  align-items: center;
  gap: .55rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--steel);
}
.legend__swatch { width: 10px; height: 10px; border: 1px solid currentColor; flex: none; }

/* ---------- 图像容器基础规则（页面阶段放置占位图） ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: linear-gradient(140deg, var(--ink-2), #101418);
  border: 1px solid var(--line);
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame img, .media-frame svg { width: 100%; height: 100%; object-fit: cover; }
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .55;
  background-image:
    linear-gradient(rgba(231, 206, 147, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(231, 206, 147, .07) 1px, transparent 1px);
  background-size: 34px 34px;
}
.media-frame__tag {
  position: absolute;
  left: .75rem;
  top: .75rem;
  z-index: 2;
  padding: .22rem .5rem;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--gold-soft);
  background: rgba(14, 17, 20, .75);
  border: 1px solid var(--line);
}
.media-caption { margin-top: .6rem; font-family: var(--font-mono); font-size: .6875rem; letter-spacing: .1em; color: var(--steel); }

/* ---------- 长文 ---------- */
.prose { max-width: 70ch; font-size: var(--step-1); line-height: 1.8; }
.prose > * + * { margin-top: 1em; }
.prose :is(h2, h3) { margin-top: 2em; }
.prose ul { display: grid; gap: .5rem; }
.prose ul li { position: relative; padding-left: 1.35rem; }
.prose ul li::before { content: "—"; position: absolute; left: 0; color: var(--gold); }
.section--paper .prose ul li::before { color: #7A5C13; }

/* ---------- 分段切换 ---------- */
.tabs__list {
  display: flex;
  gap: .2rem;
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
}
.tabs__tab {
  padding: .8rem 1.1rem;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .12em;
  text-transform: uppercase;
  white-space: nowrap;
  cursor: pointer;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}
.tabs__tab:hover { color: var(--white); background: rgba(201, 162, 77, .08); }
.tabs__tab[aria-selected="true"] { color: var(--gold); border-bottom-color: var(--gold); }
.tabs__panel { padding-top: 1.5rem; }
.tabs__panel:focus-visible { outline: 2px solid var(--gold-soft); outline-offset: 4px; }

/* ---------- 动效 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
  transition-delay: var(--reveal-delay, 0s);
}
[data-reveal].is-revealed { opacity: 1; transform: none; }

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--gold), var(--cinnabar));
  z-index: 3;
  transition: transform .1s linear;
}

/* ---------- 响应式：平板 ---------- */
@media (max-width: 1080px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 960px) {
  .header-note__time { display: none; }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    background: var(--ink-2);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line-strong);
    box-shadow: var(--shadow);
    max-height: min(72vh, 560px);
    overflow-y: auto;
  }
  .site-nav[data-open] { display: block; }
  .site-nav__list { flex-direction: column; align-items: stretch; gap: 0; padding: .25rem 0; }
  .site-nav__link {
    justify-content: space-between;
    padding: .95rem var(--gutter);
    border-bottom: 1px solid var(--line);
    border-left: 2px solid transparent;
  }
  .site-nav li:last-child .site-nav__link { border-bottom: 0; }
  .site-nav__link:hover { border-left-color: var(--gold); }
  .site-nav__link[aria-current="page"] {
    border-left-color: var(--gold);
    border-bottom-color: var(--line);
    background: rgba(201, 162, 77, .08);
  }
  .footer-col--brand { grid-column: 1 / -1; }
  .grid > .col-5,
  .grid > .col-7,
  .grid > .col-8,
  .grid > .col-9,
  .grid > .col-10 { grid-column: 1 / -1; }
  .grid > .col-2,
  .grid > .col-3,
  .grid > .col-4 { grid-column: span 6; }
}

/* ---------- 响应式：手机 ---------- */
@media (max-width: 560px) {
  body { font-size: .9375rem; }
  .header-note__mail { display: none; }
  .header-side .btn { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .index-list__row { grid-template-columns: 3rem 1fr; }
  .index-list__note { grid-column: 2 / -1; }
  .grid > .col-2,
  .grid > .col-3,
  .grid > .col-4,
  .grid > .col-5,
  .grid > .col-6,
  .grid > .col-7,
  .grid > .col-8,
  .grid > .col-9,
  .grid > .col-10,
  .grid > .col-12 { grid-column: 1 / -1; }
  .lede { font-size: var(--step-1); }
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  html:focus-within { scroll-behavior: auto; }
  [data-reveal] { opacity: 1; transform: none; transition: none; }
}