/* ==========================================================================
   HG皇官网 · 共享样式 / assets/site.css
   索引手册：墨蓝书脊 + 暖纸内容区 + 琥珀金索引
   ========================================================================== */

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
img, svg, video { display: block; max-width: 100%; }
table { border-collapse: collapse; width: 100%; }
input, textarea, select { font: inherit; color: inherit; }

/* ---------- tokens ---------- */
:root {
  --ink: #0E1B2A;
  --ink-soft: #1E3A44;
  --paper: #F3EDE1;
  --shell: #FBF7EF;
  --gold: #E0A64A;
  --gold-deep: #C08B2E;
  --gold-wash: #F0E2C0;
  --mist: #7A8C99;
  --text: #11161C;
  --alert: #D97742;
  --invert: #FBF7EF;

  --line: rgba(14, 27, 42, .15);
  --line-soft: rgba(14, 27, 42, .08);
  --line-invert: rgba(251, 247, 239, .14);
  --line-gold: rgba(224, 166, 74, .34);

  --font-head: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --fs-display: clamp(2.8rem, 7vw, 4.75rem);
  --fs-page: clamp(1.9rem, 3.6vw, 2.6rem);
  --fs-sec: clamp(1.35rem, 2.2vw, 1.9rem);
  --fs-sub: 1.25rem;
  --fs-body: 1.0625rem;

  --rail-w: 288px;
  --rail-h: 64px;
  --gutter: clamp(1.25rem, 4vw, 3rem);

  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- base ---------- */
body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--text);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

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

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

/* ---------- 中文排版 ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--text);
}
h1 { font-size: var(--fs-page); }
h2 { font-size: var(--fs-sec); }
h3 { font-size: var(--fs-sub); font-weight: 700; }

p { max-width: 40em; }

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

/* ---------- 布局容器 ---------- */
.wrap {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.grid { display: grid; gap: clamp(20px, 3vw, 32px); }
.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)); }

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 999;
  padding: 10px 16px;
  background: var(--gold);
  color: var(--ink);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 14px;
  transform: translateY(-180%);
  transition: transform .2s var(--ease);
}
.skip-link:focus { transform: none; }

/* ==========================================================================
   侧边轨道 / 头部
   ========================================================================== */
.rail {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 70;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  gap: clamp(18px, 3vh, 30px);
  padding: 26px 24px 22px;
  background: var(--ink);
  color: var(--invert);
  border-right: 1px solid var(--line-gold);
  overflow-y: auto;
  overscroll-behavior: contain;
}
.rail::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(180deg, rgba(224,166,74,.09) 0 1px, transparent 1px 14px);
  opacity: .8;
}
.rail__brand-row,
.rail__nav,
.rail__foot,
.rail__toggle { position: relative; z-index: 1; }

.rail::-webkit-scrollbar { width: 6px; }
.rail::-webkit-scrollbar-track { background: transparent; }
.rail::-webkit-scrollbar-thumb { background: rgba(224,166,74,.32); }

/* 品牌 */
.rail__brand-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex: none;
}
.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.brand__mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  flex: none;
  background: var(--gold);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
}
.brand__text { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.brand__name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.15;
  letter-spacing: .01em;
  color: var(--invert);
}
.brand__sub {
  font-family: var(--font-mono);
  font-size: 9px;
  line-height: 1;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--gold);
}

/* 导航 */
.rail__nav {
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex: 1 1 auto;
  min-height: 0;
}
.rail__nav-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-gold);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--mist);
  max-width: none;
}
.rail__list { display: flex; flex-direction: column; }
.rail__item { border-bottom: 1px solid var(--line-invert); }
.rail__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 6px 13px 16px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 600;
  color: rgba(251, 247, 239, .72);
  transition: color .2s var(--ease), padding-left .25s var(--ease);
}
.rail__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 2px;
  height: 0;
  background: var(--gold);
  transform: translateY(-50%);
  transition: height .25s var(--ease);
}
.rail__link:hover { color: var(--invert); padding-left: 20px; }
.rail__link:hover::before { height: 58%; }
.rail__link[aria-current="page"] { color: var(--gold); }
.rail__link[aria-current="page"]::before { height: 58%; }
.rail__num {
  flex: none;
  font-size: 10px;
  letter-spacing: .14em;
  color: var(--mist);
}
.rail__link[aria-current="page"] .rail__num { color: var(--gold-deep); }
.rail__label { letter-spacing: .02em; }

/* 轨道底部：版本切换 + 主按钮 */
.rail__foot {
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex: none;
  padding-top: 16px;
  border-top: 1px solid var(--line-gold);
}
.version { display: flex; flex-direction: column; gap: 8px; }
.version__label {
  font-size: 10px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mist);
}
.version__group { display: flex; border: 1px solid var(--line-gold); }
.version__btn {
  flex: 1 1 0;
  padding: 8px 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .04em;
  color: rgba(251, 247, 239, .58);
  border-right: 1px solid var(--line-gold);
  transition: background .2s var(--ease), color .2s var(--ease);
}
.version__btn:last-child { border-right: 0; }
.version__btn:hover { background: rgba(224, 166, 74, .14); color: var(--invert); }
.version__btn.is-active { background: var(--gold); color: var(--ink); font-weight: 700; }
.rail__cta { width: 100%; }

/* 移动抽屉按钮 */
.rail__toggle {
  display: none;
  align-items: center;
  gap: 8px;
  flex: none;
  padding: 8px 10px;
  border: 1px solid var(--line-gold);
  color: var(--invert);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .16em;
}
.rail__toggle-bars { display: grid; gap: 3px; width: 16px; }
.rail__toggle-bars span {
  display: block;
  height: 1.5px;
  background: var(--gold);
  transition: transform .25s var(--ease), opacity .2s var(--ease);
}
.rail[data-open] .rail__toggle-bars span:nth-child(1) { transform: translateY(4.5px) rotate(45deg); }
.rail[data-open] .rail__toggle-bars span:nth-child(2) { opacity: 0; }
.rail[data-open] .rail__toggle-bars span:nth-child(3) { transform: translateY(-4.5px) rotate(-45deg); }

/* 遮罩 */
.rail__scrim {
  position: fixed;
  top: var(--rail-h);
  left: 0; right: 0; bottom: 0;
  z-index: 50;
  display: none;
  background: rgba(14, 27, 42, .62);
  opacity: 0;
  visibility: hidden;
  transition: opacity .25s var(--ease), visibility .25s;
}

/* ==========================================================================
   按钮
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 20px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: .02em;
  border: 1px solid transparent;
  transition: background .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
}
.btn:active { transform: translateY(1px); }
.btn--gold { background: var(--gold); color: var(--ink); border-color: var(--gold); }
.btn--gold:hover { background: var(--gold-deep); border-color: var(--gold-deep); }
.btn--ink { background: var(--ink); color: var(--invert); border-color: var(--ink); }
.btn--ink:hover { background: var(--ink-soft); border-color: var(--ink-soft); }
.btn--line { background: transparent; color: var(--ink); border-color: rgba(14, 27, 42, .3); }
.btn--line:hover { border-color: var(--gold-deep); color: var(--gold-deep); }
.btn--line-invert { background: transparent; color: var(--gold); border-color: var(--line-gold); }
.btn--line-invert:hover { background: rgba(224, 166, 74, .14); }

/* ==========================================================================
   面包屑
   ========================================================================== */
.crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mist);
}
.crumb a {
  color: var(--gold-deep);
  border-bottom: 1px solid transparent;
  transition: border-color .2s var(--ease);
}
.crumb a:hover { border-color: var(--gold-deep); }
.crumb__sep { color: rgba(14, 27, 42, .28); }
.crumb [aria-current="page"] { color: var(--ink); }
.crumb--invert { color: rgba(251, 247, 239, .55); }
.crumb--invert a { color: var(--gold); }
.crumb--invert .crumb__sep { color: rgba(251, 247, 239, .3); }
.crumb--invert [aria-current="page"] { color: var(--invert); }

/* ==========================================================================
   正文容器
   ========================================================================== */
.prose { max-width: 38rem; color: rgba(17, 22, 28, .84); }
.prose > * + * { margin-top: 1em; }
.prose h2 { font-size: var(--fs-sec); margin-top: 1.6em; }
.prose h3 { font-size: var(--fs-sub); margin-top: 1.35em; }
.prose ul { list-style: none; padding-left: 0; }
.prose ul li { position: relative; padding-left: 16px; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .74em;
  width: 7px;
  height: 1px;
  background: var(--gold-deep);
}
.prose ol { list-style: decimal; padding-left: 1.4em; }
.prose strong { font-weight: 700; color: var(--ink); }
.prose a { color: var(--gold-deep); border-bottom: 1px solid var(--line-gold); }
.prose a:hover { color: var(--ink); }
.prose blockquote {
  border-left: 2px solid var(--gold);
  padding-left: 18px;
  color: var(--ink-soft);
}
.prose > p { max-width: 38rem; }

/* ==========================================================================
   面板 / 标签 / 章节头 / 刻度线 / 表格
   ========================================================================== */
.panel {
  position: relative;
  padding: clamp(20px, 2.6vw, 30px);
  background: var(--shell);
  border: 1px solid var(--line);
}
.panel--ink {
  background: var(--ink);
  border-color: var(--line-gold);
  color: rgba(251, 247, 239, .78);
}
.panel--ink h2, .panel--ink h3 { color: var(--invert); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  background: var(--gold-wash);
  border: 1px solid rgba(14, 27, 42, .18);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--ink-soft);
}
.tag--live {
  background: var(--alert);
  border-color: var(--alert);
  color: #fff;
}

.sec-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.sec-head__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold-deep);
}
.sec-head__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(22px, 2.6vw, 30px);
  letter-spacing: -.01em;
}

.rule {
  height: 1px;
  border: 0;
  background: var(--line);
}
.rule--ticks {
  position: relative;
  height: 12px;
  background: none;
  border-bottom: 1px solid var(--line);
}
.rule--ticks::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 6px;
  background-image: repeating-linear-gradient(90deg, rgba(14, 27, 42, .26) 0 1px, transparent 1px 12px);
}

.table { width: 100%; font-size: 15px; }
.table th,
.table td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}
.table thead th {
  background: var(--gold-wash);
  border-bottom: 1px solid var(--gold-deep);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .08em;
  color: var(--ink-soft);
}
.table tbody tr:hover { background: rgba(224, 166, 74, .08); }

/* ==========================================================================
   图片容器基础规则
   ========================================================================== */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: linear-gradient(150deg, #1E3A44 0%, #0E1B2A 100%);
  border: 1px solid var(--line);
}
.media > img,
.media > svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media__ph {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 16px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: rgba(224, 166, 74, .42);
}
.media__cap {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 9px 14px;
  background: rgba(14, 27, 42, .82);
  color: rgba(251, 247, 239, .85);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
}
.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }
.media--paper {
  background: linear-gradient(150deg, #FBF7EF 0%, #F3EDE1 100%);
  border-color: var(--line);
}

/* ==========================================================================
   滚动进度 / 返回顶部
   ========================================================================== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 90;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--gold-deep), var(--gold));
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
}

.to-top {
  position: fixed;
  right: clamp(16px, 3vw, 32px);
  bottom: clamp(16px, 3vw, 32px);
  z-index: 80;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  background: var(--ink);
  color: var(--gold);
  border: 1px solid rgba(224, 166, 74, .5);
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .25s var(--ease), transform .25s var(--ease), visibility .25s, background .2s var(--ease), color .2s var(--ease);
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { background: var(--gold); color: var(--ink); }

/* ==========================================================================
   显现动效
   ========================================================================== */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}
[data-reveal].is-in { opacity: 1; transform: none; }

/* ==========================================================================
   页脚
   ========================================================================== */
.site-foot {
  position: relative;
  margin-top: clamp(56px, 9vw, 110px);
  padding: clamp(52px, 7vw, 86px) 0 26px;
  background: var(--ink);
  border-top: 1px solid var(--line-gold);
  color: rgba(251, 247, 239, .68);
  font-size: 15px;
  line-height: 1.7;
}
.site-foot p { max-width: none; }

.site-foot__grid {
  display: grid;
  grid-template-columns: 1.55fr 1fr 1.35fr 1fr;
  gap: clamp(28px, 4vw, 56px);
}

.foot-brand {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 22px;
  letter-spacing: .01em;
  color: var(--invert);
}
.foot-kicker {
  margin-top: 6px;
  font-size: 10px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gold);
}
.foot-text {
  margin-top: 14px;
  max-width: 30em;
  font-size: 14.5px;
  color: rgba(251, 247, 239, .6);
}

.foot-title {
  padding-bottom: 12px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line-invert);
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mist);
}

.foot-list { display: flex; flex-direction: column; gap: 10px; font-size: 15px; }
.foot-list a {
  display: inline-block;
  color: rgba(251, 247, 239, .72);
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.foot-list a:hover { color: var(--gold); border-color: var(--line-gold); }
.foot-list--meta { gap: 12px; }
.foot-list--meta li { display: flex; flex-direction: column; gap: 2px; }
.foot-key { font-size: 10px; letter-spacing: .18em; color: var(--mist); }
.foot-val { color: rgba(251, 247, 239, .8); word-break: break-word; }

.foot-note {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line-invert);
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}
.foot-icp {
  margin-top: 16px;
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(251, 247, 239, .5);
}

.site-foot__base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 26px;
  margin-top: clamp(36px, 5vw, 58px);
  padding-top: 18px;
  border-top: 1px solid var(--line-invert);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--mist);
}
.site-foot__base span { max-width: none; }

/* ==========================================================================
   响应式
   ========================================================================== */
@media (min-width: 1080px) {
  body { padding-left: var(--rail-w); }
  .skip-link { left: calc(var(--rail-w) + 12px); }
  .scroll-progress { left: var(--rail-w); width: calc(100% - var(--rail-w)); }
}

@media (max-width: 1079px) {
  body { padding-left: 0; padding-top: var(--rail-h); }

  .rail {
    top: 0; bottom: auto;
    left: 0; right: 0;
    width: 100%;
    height: var(--rail-h);
    flex-direction: row;
    align-items: center;
    gap: 10px;
    padding: 0 14px;
    overflow: visible;
    border-right: 0;
    border-bottom: 1px solid var(--line-gold);
  }
  .rail::before { display: none; }

  .rail__brand-row { flex: 0 1 auto; min-width: 0; }
  .brand { gap: 9px; }
  .brand__mark { width: 32px; height: 32px; font-size: 12px; }
  .brand__name { font-size: 15px; white-space: nowrap; }
  .brand__sub { display: none; }

  .rail__nav {
    position: fixed;
    top: var(--rail-h);
    left: 0; right: 0;
    z-index: 55;
    display: block;
    max-height: calc(100vh - var(--rail-h));
    overflow-y: auto;
    padding: 18px 18px 26px;
    background: var(--ink);
    border-bottom: 1px solid var(--line-gold);
    box-shadow: 0 28px 48px -28px rgba(0, 0, 0, .75);
    transform: translateY(-10px);
    opacity: 0;
    visibility: hidden;
    transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s;
  }
  .rail[data-open] .rail__nav { transform: none; opacity: 1; visibility: visible; }
  .rail__nav-label { margin-bottom: 12px; }

  .rail__foot {
    flex-direction: row;
    align-items: center;
    gap: 8px;
    margin-left: auto;
    padding-top: 0;
    border-top: 0;
  }
  .version { flex-direction: row; align-items: center; }
  .version__label { display: none; }
  .version__btn { padding: 6px 9px; font-size: 10px; letter-spacing: 0; }
  .rail__cta { display: none; }

  .rail__toggle { display: inline-flex; }

  .rail__scrim { display: block; }
  .rail[data-open] .rail__scrim { opacity: 1; visibility: visible; }
}

@media (max-width: 960px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-foot__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 36px 28px; }
  .foot-col--brand { grid-column: span 2; }
}

@media (max-width: 620px) {
  :root { --fs-body: 1rem; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .site-foot__grid { grid-template-columns: minmax(0, 1fr); }
  .foot-col--brand { grid-column: auto; }
  .site-foot__base { flex-direction: column; align-items: flex-start; }
  .to-top { width: 42px; height: 42px; }
}

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