/* ==========================================================================
   幸运28 · 共享样式表 /assets/site.css
   高原红土 × 茶褐 × 米白纸 · 居中刊头 · 12 列精密网格
   ========================================================================== */

/* --- 1. 设计变量 ---------------------------------------------------------- */
:root {
  /* 色板 */
  --ink: #1E1A17;
  --clay: #A63A22;
  --clay-soft: #C96A3F;
  --tea: #6B4A32;
  --gold: #D8A037;
  --celadon: #4F7E6B;
  --paper: #F4EDE3;
  --sand: #E0D6C8;
  --pit: #12100E;
  --pale-gold: #F0D9A8;

  /* 派生 */
  --rule: rgba(30, 26, 23, .16);
  --rule-strong: rgba(30, 26, 23, .34);
  --rule-dark: rgba(244, 237, 227, .16);
  --clay-ghost: rgba(166, 58, 34, .16);

  /* 字体 */
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, "Times New Roman", serif;
  --font-sans: "Noto Sans SC", system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Courier New", monospace;

  /* 网格 */
  --wrap: 1320px;
  --gutter: 24px;

  /* 动效 */
  --ease: cubic-bezier(.22, .7, .3, 1);
}

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

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

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(30, 26, 23, .022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 26, 23, .022) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

h1, h2, h3, h4, h5 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: .01em;
}

p { margin: 0; }
ul, ol { margin: 0; }
a { color: inherit; }
button { font: inherit; color: inherit; }

[id] { scroll-margin-top: 150px; }

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

.site-footer :focus-visible,
.masthead-utility :focus-visible,
.masthead-utility :focus-visible a {
  outline-color: var(--pale-gold);
}

::selection {
  background: var(--clay);
  color: var(--paper);
}

/* --- 3. 布局容器 ---------------------------------------------------------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding: clamp(56px, 8vw, 104px) 0; }
.section--tight { padding: clamp(36px, 5vw, 64px) 0; }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}

.grid-12 > * { grid-column: span 12; }
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

.rule-hair {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--rule);
}

/* --- 4. 页头 -------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}

.skip-link {
  position: absolute;
  left: 50%;
  top: -120px;
  z-index: 200;
  transform: translateX(-50%);
  padding: 12px 22px;
  background: var(--pit);
  color: var(--pale-gold);
  font-size: 14px;
  letter-spacing: .1em;
  text-decoration: none;
  transition: top .2s var(--ease);
}

.skip-link:focus { top: 10px; }

/* 顶部通报条 */
.masthead-utility {
  background: var(--pit);
  color: var(--pale-gold);
  font-size: 12.5px;
  letter-spacing: .06em;
  line-height: 1.6;
}

.masthead-utility__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 4px 20px;
  padding-block: 8px;
}

.utility-item {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-width: 0;
}

.utility-dot {
  width: 6px;
  height: 6px;
  flex: none;
  border-radius: 50%;
  background: var(--celadon);
  box-shadow: 0 0 0 3px rgba(79, 126, 107, .22);
}

/* 居中刊头 */
.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  padding-block: 20px 14px;
}

.nav-toggle {
  grid-column: 1;
  justify-self: start;
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  background: transparent;
  border: 1px solid var(--rule-strong);
  color: var(--ink);
  font-size: 13px;
  letter-spacing: .14em;
  cursor: pointer;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.nav-toggle:hover { border-color: var(--clay); color: var(--clay); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1.5px;
  background: currentColor;
  transition: transform .22s var(--ease);
}

.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { bottom: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(4.25px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-4.25px) rotate(-45deg); }

.masthead__brand {
  grid-column: 2;
  display: block;
  text-align: center;
  text-decoration: none;
  color: inherit;
}

.masthead__logo {
  display: block;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(30px, 4.6vw, 52px);
  line-height: 1;
  letter-spacing: .16em;
  text-indent: .16em;
  color: var(--ink);
}

.masthead__tagline {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  letter-spacing: .2em;
  color: var(--tea);
}

.masthead__cta {
  grid-column: 3;
  justify-self: end;
}

/* 栏目行 */
.nav-row { border-top: 1px solid var(--rule); }

.site-nav { display: block; }

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(12px, 2.4vw, 38px);
  padding: 12px 0;
  list-style: none;
}

.site-nav__list a {
  display: inline-block;
  padding: 6px 2px;
  font-size: 15px;
  letter-spacing: .06em;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.site-nav__list a:hover {
  color: var(--clay);
  border-bottom-color: var(--clay-soft);
}

.site-nav__list a[aria-current="page"] {
  color: var(--clay);
  border-bottom-color: var(--clay);
}

/* 阅读进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
}

.scroll-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--clay), var(--clay-soft) 55%, var(--gold));
}

/* --- 5. 页脚 -------------------------------------------------------------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 9vw, 120px);
  background: var(--pit);
  color: var(--pale-gold);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 38%;
  background: linear-gradient(180deg, rgba(166, 58, 34, .30), rgba(166, 58, 34, 0) 72%);
  pointer-events: none;
}

.site-footer::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 7px;
  background-image: repeating-linear-gradient(90deg, rgba(166, 58, 34, .75) 0 2px, transparent 2px 44px);
  opacity: .55;
  pointer-events: none;
}

.footer-main {
  position: relative;
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1fr;
  gap: 44px 32px;
  padding-block: 72px 44px;
}

.footer-brand__mark {
  display: inline-block;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 32px;
  letter-spacing: .16em;
  color: var(--paper);
  text-decoration: none;
}

.footer-brand__line {
  margin-top: 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--pale-gold);
  max-width: 34ch;
}

.footer-brand__meta {
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: .06em;
  color: rgba(240, 217, 168, .62);
}

.footer-col__title {
  margin-bottom: 16px;
  padding-bottom: 10px;
  font-family: var(--font-serif);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: .2em;
  color: var(--paper);
  border-bottom: 1px solid var(--rule-dark);
}

.footer-col ul {
  display: grid;
  gap: 10px;
  list-style: none;
  padding: 0;
}

.footer-col a {
  display: inline-block;
  font-size: 15px;
  color: rgba(240, 217, 168, .84);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
}

.footer-col a:hover {
  color: var(--gold);
  border-bottom-color: rgba(216, 160, 55, .6);
  transform: translateX(4px);
}

.footer-sync {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 16px 28px;
  padding-block: 22px;
  border-top: 1px solid var(--rule-dark);
  border-bottom: 1px solid var(--rule-dark);
}

.footer-sync__title {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 900;
  letter-spacing: .24em;
  color: var(--gold);
  white-space: nowrap;
}

.footer-sync__text {
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(240, 217, 168, .72);
  max-width: 78ch;
}

.sync-badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 14px;
  border: 1px solid rgba(79, 126, 107, .62);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--pale-gold);
  white-space: nowrap;
}

.sync-badge::before {
  content: "";
  width: 7px;
  height: 7px;
  flex: none;
  border-radius: 50%;
  background: var(--celadon);
}

.footer-contact {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 26px 32px;
  padding-block: 40px;
}

.footer-contact__item { margin: 0; }

.footer-contact__item dt {
  margin-bottom: 9px;
  font-size: 12px;
  letter-spacing: .2em;
  color: rgba(240, 217, 168, .55);
}

.footer-contact__item dd {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.footer-contact__value {
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper);
  word-break: break-word;
}

.footer-contact__value--note {
  font-size: 13px;
  line-height: 1.75;
  color: rgba(240, 217, 168, .68);
}

.copy-btn {
  padding: 4px 10px;
  background: transparent;
  border: 1px solid var(--rule-dark);
  color: rgba(240, 217, 168, .8);
  font-size: 12px;
  letter-spacing: .12em;
  cursor: pointer;
  transition: border-color .2s var(--ease), color .2s var(--ease), background-color .2s var(--ease);
}

.copy-btn:hover {
  border-color: var(--gold);
  color: var(--gold);
}

.copy-btn.is-copied {
  border-color: var(--celadon);
  color: var(--paper);
  background: rgba(79, 126, 107, .28);
}

.footer-legal {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 28px;
  padding-block: 20px 36px;
  border-top: 1px solid var(--rule-dark);
  font-size: 12.5px;
  letter-spacing: .05em;
  color: rgba(240, 217, 168, .55);
}

/* --- 6. 通用按钮 ---------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 24px;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1;
  letter-spacing: .08em;
  text-decoration: none;
  text-align: center;
  border: 1px solid transparent;
  border-radius: 0;
  background: var(--clay);
  color: var(--paper);
  cursor: pointer;
  transition: background-color .22s var(--ease), color .22s var(--ease),
              border-color .22s var(--ease), transform .22s var(--ease);
}

.btn:hover { background: var(--clay-soft); transform: translateX(4px); }
.btn:active { transform: translateX(2px); }

.btn--sm {
  padding: 10px 16px;
  font-size: 13px;
  letter-spacing: .1em;
}

.btn--ghost {
  background: transparent;
  color: var(--clay);
  border-color: var(--clay);
}

.btn--ghost:hover {
  background: var(--clay);
  color: var(--paper);
  border-color: var(--clay);
}

.btn--dark {
  background: var(--pit);
  color: var(--pale-gold);
}

.btn--dark:hover { background: var(--tea); color: var(--paper); }

/* --- 7. 标签与数据 -------------------------------------------------------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 11px;
  font-size: 12.5px;
  letter-spacing: .08em;
  line-height: 1.5;
  color: var(--tea);
  background: rgba(224, 214, 200, .55);
  border: 1px solid var(--rule);
}

.tag--live {
  color: #33574A;
  border-color: rgba(79, 126, 107, .48);
  background: rgba(79, 126, 107, .1);
}

.tag--live::before {
  content: "";
  width: 6px;
  height: 6px;
  flex: none;
  border-radius: 50%;
  background: var(--celadon);
}

.tag--policy {
  color: var(--clay);
  border-color: var(--clay-ghost);
  background: rgba(166, 58, 34, .07);
}

.stat {
  padding-top: 16px;
  border-top: 2px solid var(--clay);
}

.stat__num {
  display: block;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(40px, 6vw, 78px);
  line-height: .95;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  letter-spacing: .01em;
}

.stat__label {
  display: block;
  margin-top: 10px;
  font-size: 13.5px;
  letter-spacing: .1em;
  color: var(--tea);
}

/* --- 8. 正文与标题 -------------------------------------------------------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--tea);
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--clay);
}

.eyebrow__num { color: var(--clay); font-weight: 700; }

.section-title {
  margin-bottom: 18px;
  font-size: clamp(30px, 4.6vw, 52px);
  color: var(--ink);
}

.section-note {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.75;
  letter-spacing: .03em;
  color: var(--tea);
}

.lead {
  max-width: 62ch;
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.8;
  color: var(--tea);
}

.prose {
  max-width: 72ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink);
}

.prose p { margin-bottom: 1.15em; }

.prose h2 {
  margin: 2.2em 0 .7em;
  font-size: clamp(26px, 3.2vw, 38px);
}

.prose h3 {
  margin: 1.9em 0 .6em;
  font-size: clamp(20px, 2.2vw, 24px);
}

.prose ul,
.prose ol {
  margin-bottom: 1.2em;
  padding-left: 1.3em;
}

.prose li { margin: .4em 0; }

.prose a {
  color: var(--clay);
  text-underline-offset: 3px;
}

.prose strong { font-weight: 600; }

.prose blockquote {
  margin: 1.6em 0;
  padding: 4px 0 4px 22px;
  border-left: 3px solid var(--clay);
  color: var(--tea);
}

/* --- 9. 面包屑 ------------------------------------------------------------ */
.breadcrumb {
  padding-block: 18px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--tea);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0 10px;
  list-style: none;
  padding: 0;
}

.breadcrumb li { display: inline-flex; align-items: center; gap: 10px; }

.breadcrumb li + li::before {
  content: "/";
  color: rgba(107, 74, 50, .45);
}

.breadcrumb a {
  color: var(--tea);
  text-decoration: none;
  border-bottom: 1px solid rgba(107, 74, 50, .34);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.breadcrumb a:hover {
  color: var(--clay);
  border-bottom-color: var(--clay);
}

.breadcrumb [aria-current="page"] {
  color: var(--ink);
  border: 0;
}

/* --- 10. 图版容器 -------------------------------------------------------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  background-color: var(--sand);
  background-image: linear-gradient(135deg, rgba(166, 58, 34, .15), rgba(107, 74, 50, .1) 55%, rgba(79, 126, 107, .13));
}

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--plate { aspect-ratio: 16 / 10; }
.media--square { aspect-ratio: 1 / 1; }
.media--portrait { aspect-ratio: 4 / 5; }

.media--grid::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(244, 237, 227, .18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(244, 237, 227, .18) 1px, transparent 1px);
  background-size: 60px 60px;
  box-shadow: inset 0 0 0 1px rgba(30, 26, 23, .12);
}

.media--clay::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(200deg, rgba(166, 58, 34, .38), rgba(18, 16, 14, .3));
}

.media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  margin: 0;
  padding: 26px 16px 12px;
  font-size: 12.5px;
  letter-spacing: .06em;
  line-height: 1.6;
  color: var(--pale-gold);
  background: linear-gradient(180deg, rgba(18, 16, 14, 0), rgba(18, 16, 14, .84));
}

/* --- 11. 坐标索引 -------------------------------------------------------- */
.coord-index {
  position: fixed;
  right: 22px;
  top: 50%;
  z-index: 60;
  transform: translateY(-50%);
  display: none;
}

.coord-index ul {
  display: grid;
  justify-items: end;
  gap: 14px;
  list-style: none;
  padding: 0;
}

.coord-index a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--tea);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.coord-index a::after {
  content: "";
  width: 16px;
  height: 1px;
  background: currentColor;
  transition: width .22s var(--ease), background-color .22s var(--ease);
}

.coord-index a:hover { color: var(--clay); }
.coord-index a:hover::after { width: 26px; }

.coord-index a.is-current { color: var(--clay); }
.coord-index a.is-current::after {
  width: 30px;
  background: var(--gold);
}

/* --- 12. 滚动显现 -------------------------------------------------------- */
.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .62s var(--ease), transform .62s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}

.js-reveal [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .js-reveal [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .skip-link,
  .btn,
  .copy-btn,
  .footer-col a {
    transition: none;
  }

  .btn:hover,
  .footer-col a:hover {
    transform: none;
  }
}

/* --- 13. 响应式 ---------------------------------------------------------- */
@media (min-width: 1240px) {
  .coord-index { display: block; }
}

@media (max-width: 1100px) {
  .span-3,
  .span-4,
  .span-5 { grid-column: span 6; }

  .footer-main { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer-col:last-of-type { grid-column: 1 / -1; }
  .footer-col:last-of-type ul { grid-auto-flow: column; justify-content: start; gap: 24px; }
}

@media (max-width: 1024px) {
  .footer-contact { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  :root { --gutter: 20px; }

  .masthead {
    grid-template-columns: auto 1fr auto;
    padding-block: 14px 12px;
  }

  .nav-toggle { display: inline-flex; }

  .masthead__logo {
    font-size: clamp(22px, 6.2vw, 30px);
    letter-spacing: .1em;
    text-indent: .1em;
  }

  .masthead__tagline {
    margin-top: 5px;
    font-size: 11px;
    letter-spacing: .1em;
  }

  .site-nav {
    display: none;
    border-top: 1px solid var(--rule);
  }

  .site-nav[data-open="true"] { display: block; }

  .site-nav__list {
    flex-direction: column;
    gap: 0;
    padding: 4px 0 10px;
  }

  .site-nav__list li { border-bottom: 1px solid var(--rule); }
  .site-nav__list li:last-child { border-bottom: 0; }

  .site-nav__list a {
    display: block;
    padding: 13px 4px;
    font-size: 16px;
    border-bottom: 0;
    border-left: 3px solid transparent;
    padding-left: 12px;
  }

  .site-nav__list a:hover,
  .site-nav__list a[aria-current="page"] {
    border-bottom-color: transparent;
    border-left-color: var(--clay);
    background: rgba(166, 58, 34, .06);
  }

  .footer-sync { grid-template-columns: 1fr; }
  .footer-sync__title { white-space: normal; }
}

@media (max-width: 720px) {
  body { font-size: 16px; }

  .span-3,
  .span-4,
  .span-5,
  .span-6,
  .span-7,
  .span-8 { grid-column: span 12; }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 34px;
    padding-block: 56px 34px;
  }

  .footer-col:last-of-type ul { grid-auto-flow: row; gap: 10px; }
  .footer-contact { grid-template-columns: 1fr; padding-block: 32px; }
  .footer-brand__mark { font-size: 27px; }
}

@media (max-width: 560px) {
  .masthead-utility { font-size: 11.5px; letter-spacing: .03em; }
  .masthead__cta { padding: 9px 12px; font-size: 12.5px; letter-spacing: .04em; }
  .btn { padding: 13px 20px; font-size: 14px; }
  .footer-legal { font-size: 12px; }
}