/* =========================================================
   宝石娱乐馆 · 共享样式 /assets/site.css
   暗色多切面工坊：近单色宝石蓝 + 琥珀金 / 翠榴石绿高光
   ========================================================= */

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

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

body { margin: 0; }

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

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

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

button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }

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

table { border-collapse: collapse; }

:target { scroll-margin-top: 120px; }

/* ---------- 2. 变量 ---------- */
:root {
  /* 宝石色阶 */
  --abyss: #030812;
  --sapphire: #071A33;
  --lapis: #123B66;
  --prussian: #1E5A8A;
  --prism: #7FD3E8;
  --amber: #E8B45C;
  --amber-deep: #D89A3C;
  --garnet: #4CC38A;
  --moon: #F2EEE4;
  --mist: #A8B8C8;
  --ember: #E07A5F;

  /* 语义 */
  --ink: var(--moon);
  --ink-soft: var(--mist);
  --ink-faint: rgba(168, 184, 200, 0.72);
  --line: rgba(127, 211, 232, 0.18);
  --line-soft: rgba(127, 211, 232, 0.10);
  --line-strong: rgba(127, 211, 232, 0.42);
  --panel-fill: rgba(18, 59, 102, 0.55);

  /* 字体 */
  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;

  /* 节奏 */
  --wrap: 1240px;
  --gutter: clamp(18px, 4.2vw, 52px);
  --gap-2xs: 6px;
  --gap-xs: 10px;
  --gap-sm: 16px;
  --gap-md: 26px;
  --gap-lg: 42px;
  --gap-xl: 68px;
  --gap-2xl: 104px;

  --radius-s: 2px;
  --radius-m: 6px;

  --ease: cubic-bezier(0.22, 0.68, 0.28, 1);
  --dur-fast: 180ms;
  --dur: 260ms;
  --dur-slow: 420ms;
}

/* ---------- 3. 基础排版 ---------- */
body {
  background:
    radial-gradient(1200px 620px at 84% -10%, rgba(30, 90, 138, 0.30), transparent 62%),
    radial-gradient(820px 520px at 2% 10%, rgba(18, 59, 102, 0.42), transparent 66%),
    var(--abyss);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: clamp(15.5px, 1.02vw, 17px);
  line-height: 1.78;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 {
  font-family: var(--font-display);
  line-height: 1.24;
  letter-spacing: 0.04em;
  color: var(--moon);
}

h1 { font-size: clamp(2.4rem, 5.6vw, 4.8rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.12rem, 1.7vw, 1.4rem); }

p { line-height: 1.78; }

strong { color: var(--moon); font-weight: 600; }

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

/* ---------- 4. 焦点与无障碍 ---------- */
a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible,
summary:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid var(--prism);
  outline-offset: 3px;
  border-radius: 1px;
}

.skip-link {
  position: absolute;
  left: 50%;
  top: 0;
  z-index: 200;
  transform: translate(-50%, -140%);
  padding: 10px 22px;
  background: var(--amber);
  color: #1A1204;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  border-radius: 0 0 var(--radius-s) var(--radius-s);
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus-visible {
  transform: translate(-50%, 0);
  outline-offset: 2px;
}

/* =========================================================
   5. 头部
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background:
    linear-gradient(180deg, rgba(3, 8, 18, 0.99) 0%, rgba(5, 13, 28, 0.98) 58%, rgba(7, 26, 51, 0.97) 100%);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 22px 44px -34px rgba(0, 0, 0, 0.95);
  color: var(--moon);
}

.site-header::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    116deg,
    rgba(127, 211, 232, 0.05) 0 1px,
    transparent 1px 92px
  );
  opacity: 0.7;
}

/* 顶部细线轨 */
.utility-rail {
  position: relative;
  z-index: 1;
  border-bottom: 1px solid var(--line-soft);
  background: rgba(3, 8, 18, 0.72);
}

.utility-rail__inner {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
  min-height: 36px;
}

.utility-rail__meta {
  display: flex;
  align-items: center;
  gap: var(--gap-xs);
  flex: 0 0 auto;
  white-space: nowrap;
}

.utility-rail__version {
  display: inline-flex;
  align-items: center;
  padding: 1px 8px;
  border: 1px solid rgba(232, 180, 92, 0.34);
  border-left: 2px solid var(--amber);
  background: rgba(232, 180, 92, 0.08);
  color: var(--amber);
  font-size: 11px;
  letter-spacing: 0.16em;
}

.utility-rail__dot {
  width: 5px;
  height: 5px;
  flex: 0 0 auto;
  transform: rotate(45deg);
  background: var(--garnet);
  box-shadow: 0 0 8px rgba(76, 195, 138, 0.85);
}

.utility-rail__label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.22em;
  color: var(--ink-faint);
}

.read-progress {
  position: relative;
  flex: 1 1 auto;
  min-width: 48px;
  height: 2px;
  border-radius: 2px;
  background: rgba(127, 211, 232, 0.16);
  overflow: hidden;
}

.read-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--prussian), var(--prism) 68%, var(--amber));
  box-shadow: 0 0 12px rgba(127, 211, 232, 0.55);
  transition: width 120ms linear;
}

.utility-rail__cta {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 22px;
  padding: 2px 11px;
  border: 1px solid rgba(232, 180, 92, 0.42);
  background: rgba(232, 180, 92, 0.06);
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 7px), calc(100% - 7px) 100%, 0 100%);
  transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

.utility-rail__cta:hover,
.utility-rail__cta:focus-visible {
  background: rgba(232, 180, 92, 0.18);
  color: var(--moon);
}

/* 主栏 */
.header-bar__inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 30px);
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(10px, 1.4vw, 16px) var(--gutter);
}

.header-bar__inner::before {
  content: "";
  position: absolute;
  left: var(--gutter);
  right: var(--gutter);
  bottom: 0;
  height: 1px;
  pointer-events: none;
  background: linear-gradient(
    90deg,
    rgba(127, 211, 232, 0.42),
    rgba(127, 211, 232, 0.06) 44%,
    rgba(232, 180, 92, 0.34) 84%,
    transparent
  );
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  color: var(--moon);
}

.brand__gem {
  position: relative;
  width: 32px;
  height: 32px;
  flex: 0 0 auto;
  clip-path: polygon(50% 0, 100% 28%, 100% 72%, 50% 100%, 0 72%, 0 28%);
  background: conic-gradient(from 210deg, var(--prussian), var(--prism), var(--amber), var(--prussian));
  box-shadow: 0 0 22px rgba(127, 211, 232, 0.32);
  transition: box-shadow var(--dur) var(--ease);
}

.brand__gem::after {
  content: "";
  position: absolute;
  inset: 4px;
  clip-path: inherit;
  background: linear-gradient(158deg, rgba(3, 8, 18, 0.86), rgba(3, 8, 18, 0.34));
}

.brand:hover .brand__gem,
.brand:focus-visible .brand__gem {
  box-shadow: 0 0 28px rgba(232, 180, 92, 0.55);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.12;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: 0.14em;
  color: var(--moon);
}

.brand__latin {
  margin-top: 3px;
  font-size: 9.5px;
  letter-spacing: 0.32em;
  color: var(--prism);
  opacity: 0.82;
}

/* 移动端按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 8px 13px;
  border: 1px solid var(--line-strong);
  background: rgba(18, 59, 102, 0.42);
  color: var(--prism);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}

.nav-toggle:hover {
  background: rgba(30, 90, 138, 0.6);
  color: var(--moon);
}

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}

.nav-toggle__bars span {
  display: block;
  height: 1px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur-fast) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(4px) 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(-4px) rotate(-45deg);
}

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  flex: 1 1 auto;
  min-width: 0;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.7vw, 26px);
}

.site-nav__list--left { flex: 0 0 auto; }
.site-nav__list--right { flex: 0 0 auto; }

.site-nav__seam {
  position: relative;
  flex: 1 1 auto;
  align-self: stretch;
  min-width: 26px;
  min-height: 26px;
}

.site-nav__seam::before {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  top: 50%;
  height: 1px;
  background: linear-gradient(
    90deg,
    rgba(127, 211, 232, 0.30),
    rgba(127, 211, 232, 0.05) 48%,
    rgba(232, 180, 92, 0.30)
  );
}

.site-nav__seam::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 8px;
  height: 8px;
  transform: translate(-50%, -50%) rotate(45deg);
  border: 1px solid rgba(127, 211, 232, 0.5);
  background: rgba(7, 26, 51, 0.92);
}

.site-nav__list a {
  position: relative;
  display: inline-block;
  padding: 8px 2px;
  font-size: 14.5px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  transition: color var(--dur-fast) var(--ease);
}

.site-nav__list a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 1px;
  background: linear-gradient(90deg, var(--prism), var(--amber));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}

.site-nav__list a:hover,
.site-nav__list a:focus-visible {
  color: var(--moon);
}

.site-nav__list a:hover::after,
.site-nav__list a:focus-visible::after {
  transform: scaleX(1);
}

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

.site-nav__list a[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--amber);
}

.site-nav__list a[aria-current="page"]::before {
  content: "";
  position: absolute;
  top: 3px;
  left: -9px;
  width: 4px;
  height: 4px;
  transform: rotate(45deg);
  background: var(--amber);
}

.site-nav__quick {
  display: none;
}

/* =========================================================
   6. 页脚
   ========================================================= */
.site-footer {
  position: relative;
  margin-top: var(--gap-2xl);
  background:
    radial-gradient(900px 420px at 88% 0%, rgba(30, 90, 138, 0.32), transparent 62%),
    linear-gradient(180deg, rgba(5, 13, 28, 0.6) 0%, rgba(3, 8, 18, 0.97) 42%, var(--abyss) 100%);
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 14.5px;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(127, 211, 232, 0.55) 22%,
    rgba(232, 180, 92, 0.5) 58%,
    rgba(76, 195, 138, 0.4) 84%,
    transparent
  );
}

.site-footer__inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(46px, 6vw, 86px) var(--gutter) clamp(16px, 2vw, 24px);
}

.site-footer__top {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.9fr);
  gap: var(--gap-xl);
  align-items: start;
}

.site-footer__mark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.4vw, 26px);
  letter-spacing: 0.1em;
  color: var(--moon);
}

.site-footer__mark .mono {
  display: block;
  margin-top: 7px;
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 0.36em;
  color: var(--prism);
  opacity: 0.82;
}

.site-footer__summary {
  margin-top: var(--gap-sm);
  max-width: 40ch;
  font-size: 14.5px;
  line-height: 1.88;
  color: var(--mist);
}

.site-footer__badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-xs);
  margin-top: var(--gap-md);
}

.site-footer__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap-lg);
}

.footer-col__title {
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(232, 180, 92, 0.24);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.2em;
  color: var(--amber);
}

.footer-col__links {
  display: grid;
  gap: 10px;
}

.footer-col__links a {
  position: relative;
  display: inline-block;
  font-size: 14px;
  color: var(--mist);
  transition: color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}

.footer-col__links a::before {
  content: "";
  position: absolute;
  left: -12px;
  top: 0.66em;
  width: 5px;
  height: 5px;
  transform: rotate(45deg);
  background: var(--prussian);
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}

.footer-col__links a:hover,
.footer-col__links a:focus-visible {
  color: var(--moon);
  transform: translateX(5px);
}

.footer-col__links a:hover::before,
.footer-col__links a:focus-visible::before {
  opacity: 1;
  background: var(--prism);
}

.site-footer__contact {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap-md) var(--gap-lg);
  margin-top: var(--gap-xl);
  padding-top: var(--gap-md);
  border-top: 1px solid var(--line-soft);
  font-style: normal;
}

.contact-line {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.contact-line--wide {
  grid-column: span 2;
}

.contact-line__label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.22em;
  color: var(--prism);
  opacity: 0.86;
}

.contact-line__value {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--moon);
  overflow-wrap: anywhere;
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--gap-sm) var(--gap-md);
  margin-top: var(--gap-lg);
  padding: var(--gap-md) 0 var(--gap-lg);
  border-top: 1px solid var(--line-soft);
}

.site-footer__note {
  max-width: 54ch;
  font-size: 12.5px;
  line-height: 1.82;
  color: rgba(168, 184, 200, 0.76);
}

.site-footer__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: rgba(168, 184, 200, 0.7);
}

/* =========================================================
   7. 通用组件
   ========================================================= */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* 展览标签 */
.facet-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px 3px 8px;
  border: 1px solid var(--line-strong);
  border-left: 2px solid var(--prism);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: rgba(127, 211, 232, 0.06);
  color: var(--prism);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  white-space: nowrap;
}

.facet-tag--amber {
  border-left-color: var(--amber);
  background: rgba(232, 180, 92, 0.09);
  color: var(--amber);
}

.facet-tag--garnet {
  border-left-color: var(--garnet);
  background: rgba(76, 195, 138, 0.09);
  color: var(--garnet);
}

/* 章节 */
.section {
  margin-top: var(--gap-2xl);
}

.section__head {
  display: grid;
  gap: var(--gap-xs);
  margin-bottom: var(--gap-lg);
  padding-bottom: var(--gap-sm);
  border-bottom: 1px solid var(--line-soft);
}

.section__eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.26em;
  color: var(--amber);
  text-transform: uppercase;
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.5rem);
  letter-spacing: 0.04em;
  color: var(--moon);
}

.section__lead {
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* 面板 */
.panel {
  position: relative;
  padding: clamp(18px, 2.6vw, 32px);
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  background: linear-gradient(178deg, rgba(18, 59, 102, 0.72), rgba(7, 26, 51, 0.88));
  overflow: hidden;
}

.panel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 2px;
  height: 40px;
  background: linear-gradient(180deg, var(--prism), transparent);
}

.panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap-sm);
  margin-bottom: var(--gap-sm);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
}

.panel__title {
  font-family: var(--font-display);
  font-size: clamp(17px, 1.6vw, 20px);
  letter-spacing: 0.06em;
  color: var(--moon);
}

.panel__body {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.82;
}

/* 网格 */
.grid {
  display: grid;
  gap: var(--gap-md);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(min(100%, 262px), 1fr)); }

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 11px 24px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-s);
  background: rgba(18, 59, 102, 0.42);
  color: var(--moon);
  font-family: var(--font-body);
  font-size: 14.5px;
  letter-spacing: 0.08em;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease),
    color var(--dur) var(--ease), transform var(--dur-fast) var(--ease);
}

.btn:hover {
  background: rgba(30, 90, 138, 0.62);
  border-color: var(--prism);
  transform: translateY(-1px);
}

.btn--primary {
  border-color: transparent;
  background: linear-gradient(135deg, var(--amber), var(--amber-deep));
  color: #1A1204;
  font-weight: 600;
  box-shadow: 0 12px 28px -18px rgba(232, 180, 92, 0.95);
}

.btn--primary:hover {
  background: linear-gradient(135deg, #F0C274, #E0A64A);
  color: #1A1204;
}

.btn--ghost {
  background: transparent;
}

.btn--sm {
  min-height: 36px;
  padding: 7px 15px;
  font-size: 13px;
}

/* 面包屑 */
.breadcrumb {
  margin-bottom: var(--gap-md);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb__link {
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.breadcrumb__link:hover,
.breadcrumb__link:focus-visible {
  color: var(--prism);
  border-bottom-color: rgba(127, 211, 232, 0.5);
}

.breadcrumb__sep {
  color: rgba(127, 211, 232, 0.45);
}

.breadcrumb__current {
  color: var(--amber);
}

/* 图片容器 */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  background:
    radial-gradient(120% 90% at 78% 8%, rgba(127, 211, 232, 0.22), transparent 58%),
    linear-gradient(152deg, var(--lapis), var(--sapphire) 62%, var(--abyss));
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    122deg,
    rgba(127, 211, 232, 0.10) 0 1px,
    transparent 1px 26px
  );
}

.media-frame img,
.media-frame picture,
.media-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 1;
  max-width: 100%;
  padding: 8px 14px;
  border-top: 1px solid var(--line);
  background: rgba(3, 8, 18, 0.74);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--moon);
}

/* 动效协议 */
.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease);
}

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

[data-outline-link].is-active {
  color: var(--amber);
}

/* =========================================================
   8. 响应式
   ========================================================= */
@media (max-width: 1080px) {
  .site-footer__top {
    grid-template-columns: 1fr;
    gap: var(--gap-lg);
  }

  .site-footer__summary { max-width: 60ch; }
}

@media (max-width: 960px) {
  .header-bar__inner {
    flex-wrap: wrap;
    row-gap: 8px;
  }

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .site-nav {
    order: 3;
    flex: 1 1 100%;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    padding-top: 0;
    border-top: 1px solid transparent;
    transition: max-height var(--dur-slow) var(--ease), opacity var(--dur) var(--ease),
      margin-top var(--dur) var(--ease), padding-top var(--dur) var(--ease);
  }

  .site-nav[data-open="true"] {
    max-height: 72vh;
    opacity: 1;
    overflow-y: auto;
    margin-top: 12px;
    padding-top: 10px;
    border-top-color: var(--line);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__list--left,
  .site-nav__list--right { flex: 0 0 auto; }

  .site-nav__seam { display: none; }

  .site-nav__list a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 13px 4px;
    font-size: 16px;
    letter-spacing: 0.06em;
    border-bottom: 1px solid var(--line-soft);
  }

  .site-nav__list a::after { display: none; }

  .site-nav__list a[aria-current="page"]::before {
    top: 50%;
    left: 0;
    margin-top: -2px;
  }

  .site-nav__list a[aria-current="page"] {
    padding-left: 16px;
  }

  .site-nav__quick {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    padding: 16px 0 6px;
  }

  .site-nav .site-nav__quick-link {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 10px 6px;
    border: 1px solid var(--line);
    border-bottom-color: var(--line);
    background: rgba(18, 59, 102, 0.5);
    color: var(--moon);
    font-size: 13px;
    letter-spacing: 0.06em;
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 7px), calc(100% - 7px) 100%, 0 100%);
  }

  .site-nav .site-nav__quick-link[aria-current="page"] {
    padding-left: 6px;
    color: var(--amber);
  }

  .site-nav .site-nav__quick-link[aria-current="page"]::before {
    display: none;
  }

  .site-footer__contact {
    grid-template-columns: 1fr;
  }

  .contact-line--wide {
    grid-column: span 1;
  }
}

@media (max-width: 820px) {
  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }

  .section { margin-top: var(--gap-xl); }
}

@media (max-width: 620px) {
  .utility-rail__label { display: none; }

  .site-footer__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--gap-md);
  }

  .site-footer__legal {
    flex-direction: column;
    align-items: flex-start;
  }

  .brand__name { font-size: 17px; }
  .brand__latin { letter-spacing: 0.24em; }
}

@media (max-width: 420px) {
  .site-footer__cols { grid-template-columns: 1fr; }

  .nav-toggle__label { display: none; }
}

/* ---------- 9. 减少动态偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

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