/* ============================================================
   葡京娱乐中心 · 共享样式 /assets/site.css
   暗夜霓虹专题研究板：堆叠面板 + 细线网格 + 金色数据语言
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 110px;
}

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

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

img, svg, video, canvas { max-width: 100%; }

button, input, select, textarea { font: inherit; color: inherit; }

a { color: inherit; }

hr { border: 0; }

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

#main-content { display: block; }

/* ---------- 2. 变量 ---------- */
:root {
  /* 主色 */
  --night: #0A1230;
  --abyss: #050A1C;
  --panel: #131C3C;
  --gold: #F2C14E;
  --gold-light: #FFD98A;
  --magenta: #E23E8C;
  --emerald: #19C79B;
  --ice: #7FD4FF;
  --mist: #C9D2E3;
  --white: #F7F9FF;
  --sand: #8A6A2A;

  /* 描边层级 */
  --line: rgba(138, 106, 42, 0.45);        /* 暖沙金结构分隔线 */
  --line-cool: rgba(201, 210, 227, 0.16);  /* 冷色细边：卡片、面板 */
  --line-strong: rgba(201, 210, 227, 0.34);

  /* 字体 */
  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  /* 尺寸与节奏 */
  --wrap: 1240px;
  --gutter: clamp(20px, 4vw, 40px);
  --header-h: 76px;
  --radius: 2px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

@media (max-width: 720px) {
  :root { --header-h: 64px; }
}

/* ---------- 3. 中文排版基础 ---------- */
body {
  min-height: 100%;
  background-color: var(--night);
  background-image:
    radial-gradient(900px 520px at 10% -8%, rgba(242, 193, 78, 0.16), transparent 62%),
    radial-gradient(780px 480px at 94% 2%, rgba(226, 62, 140, 0.13), transparent 60%),
    radial-gradient(760px 540px at 48% 106%, rgba(25, 199, 155, 0.10), transparent 64%),
    linear-gradient(180deg, #0A1230 0%, #070D24 46%, #050A1C 100%);
  background-repeat: no-repeat;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.22;
  color: var(--white);
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(34px, 5.4vw, 60px); font-weight: 900; }
h2 { font-size: clamp(26px, 3.4vw, 40px); }
h3 { font-size: clamp(20px, 2vw, 24px); }
h4 { font-size: 18px; }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

strong { color: var(--white); font-weight: 700; }

code, kbd, samp, .mono {
  font-family: var(--font-mono);
  font-size: 0.94em;
  color: var(--gold);
}

/* ---------- 4. 布局工具 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.page-top { padding-top: calc(var(--header-h) + 44px); }

.section {
  position: relative;
  padding-top: clamp(52px, 7vw, 96px);
  padding-bottom: clamp(52px, 7vw, 96px);
}

.section--tight { padding-top: clamp(28px, 4vw, 52px); }

.stack { display: grid; gap: 0; }

.stack > * {
  padding-top: clamp(28px, 4vw, 52px);
  padding-bottom: clamp(28px, 4vw, 52px);
  border-top: 1px solid var(--line);
}

.stack > *:first-child {
  padding-top: 0;
  border-top: 0;
}

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

.grid { display: grid; gap: clamp(16px, 2vw, 28px); }
.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)); }

.prose {
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.prose h2 { margin: 1.6em 0 0.6em; font-size: clamp(22px, 2.4vw, 30px); }
.prose h3 { margin: 1.4em 0 0.5em; }
.prose ul, .prose ol { margin: 0 0 1.2em; padding-left: 1.3em; list-style: disc; }
.prose li { margin-bottom: 0.4em; }

.prose a {
  color: var(--ice);
  text-decoration: none;
  border-bottom: 1px solid rgba(127, 212, 255, 0.42);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.prose a:hover { color: var(--white); border-color: var(--gold); }

/* ---------- 5. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  padding: 12px 20px;
  background: var(--gold);
  color: #0A1230;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.skip-link:focus {
  left: 12px;
  top: 12px;
}

/* ---------- 6. 页头 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 120;
  background-color: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.3s var(--ease), border-color 0.3s var(--ease);
}

.site-header[data-scrolled="true"] {
  background-color: rgba(8, 14, 36, 0.9);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  backdrop-filter: blur(12px) saturate(140%);
  border-bottom-color: var(--line);
}

.header-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}

.header-progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  transform-origin: 0 50%;
  transform: scaleX(var(--progress, 0));
  background: linear-gradient(90deg, var(--magenta), var(--gold) 46%, var(--gold-light));
  transition: transform 0.12s linear;
  will-change: transform;
}

.header-inner {
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 40px);
  min-height: var(--header-h);
}

/* 品牌 */
.brand {
  position: relative;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  text-decoration: none;
  color: inherit;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  border: 1px solid rgba(242, 193, 78, 0.72);
  border-radius: var(--radius);
  background: linear-gradient(140deg, rgba(242, 193, 78, 0.22), rgba(226, 62, 140, 0.12));
  color: var(--gold);
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 900;
  line-height: 1;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--white);
}

.brand__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--gold);
  opacity: 0.9;
}

.brand--footer .brand__name { font-size: 20px; }
.brand--footer .brand__tag { font-size: 11.5px; }

/* 导航 */
.header-nav { margin-left: auto; }

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

.nav-link {
  position: relative;
  display: inline-block;
  padding: 10px 2px;
  color: var(--mist);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 1px;
  background: linear-gradient(90deg, var(--gold), var(--gold-light));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.28s var(--ease);
}

.nav-link:hover { color: var(--white); }
.nav-link:hover::after { transform: scaleX(1); }

.nav-link[aria-current="page"] { color: var(--gold); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); }

.header-actions {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

/* 移动菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--white);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

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

.nav-toggle__label { line-height: 1; }

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars i {
  display: block;
  height: 1px;
  background: currentColor;
  transition: transform 0.24s var(--ease), opacity 0.24s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: transparent;
  color: var(--white);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-decoration: none;
  cursor: pointer;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background-color 0.2s var(--ease), filter 0.2s var(--ease);
}

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

.btn--gold {
  border-color: rgba(242, 193, 78, 0.6);
  background: linear-gradient(120deg, #F2C14E, #FFD98A);
  color: #0A1230;
  font-weight: 700;
}

.btn--gold:hover {
  border-color: var(--gold-light);
  color: #0A1230;
  filter: brightness(1.08);
}

.btn--ghost {
  border-color: var(--line-strong);
  color: var(--mist);
}

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

.btn--quiet {
  padding-left: 0;
  padding-right: 0;
  border-color: transparent;
  color: var(--ice);
}

.btn--quiet:hover { color: var(--gold-light); }

/* ---------- 8. 标签与数据 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.tag--gold { border-color: rgba(242, 193, 78, 0.5); color: var(--gold); }
.tag--magenta { border-color: rgba(226, 62, 140, 0.5); color: var(--magenta); }
.tag--emerald { border-color: rgba(25, 199, 155, 0.5); color: var(--emerald); }
.tag--ice { border-color: rgba(127, 212, 255, 0.5); color: var(--ice); }

.stat { display: flex; flex-direction: column; gap: 4px; }

.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 500;
  line-height: 1.1;
  color: var(--gold);
}

.stat__label {
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

/* ---------- 9. 面板与卡片 ---------- */
.panel {
  position: relative;
  padding: clamp(20px, 2.6vw, 34px);
  border: 1px solid var(--line-cool);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(19, 28, 60, 0.94), rgba(19, 28, 60, 0.6));
  transition: border-color 0.24s var(--ease);
}

.panel:hover { border-color: rgba(242, 193, 78, 0.45); }

.panel__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
}

.panel__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.panel__label {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--mist);
  opacity: 0.72;
}

.panel__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(20px, 2vw, 24px);
  font-weight: 800;
  color: var(--white);
  line-height: 1.3;
}

.panel__body {
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.2vw, 26px);
  border: 1px solid var(--line-cool);
  border-radius: var(--radius);
  background: rgba(19, 28, 60, 0.7);
  transition: border-color 0.24s var(--ease), filter 0.24s var(--ease);
}

.card:hover {
  border-color: rgba(242, 193, 78, 0.55);
  filter: brightness(1.08);
}

.card__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.card__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(18px, 1.7vw, 22px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--white);
}

.card__body {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

.card__link {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--ice);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.card__link:hover { color: var(--gold-light); }

/* ---------- 10. 章节抬头 / 竖排注释 / 封面骨架 ---------- */
.section-head {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  gap: clamp(20px, 4vw, 48px);
  align-items: end;
  margin-bottom: clamp(26px, 4vw, 48px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--gold);
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: linear-gradient(90deg, var(--gold), transparent);
}

.section-title {
  margin: 10px 0 0;
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 900;
  line-height: 1.2;
}

.section-note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
  opacity: 0.88;
}

.vertical-note {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.34em;
  color: var(--gold);
  opacity: 0.86;
  white-space: nowrap;
}

.cover {
  position: relative;
  padding-top: calc(var(--header-h) + clamp(44px, 8vw, 112px));
  padding-bottom: clamp(48px, 7vw, 92px);
}

.cover__grid {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 2fr) minmax(0, 3fr);
  gap: clamp(20px, 3vw, 44px);
  align-items: start;
}

.cover__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(38px, 6.4vw, 72px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--white);
}

.cover__title em {
  font-style: normal;
  color: var(--gold);
}

.cover__lede {
  margin-top: 20px;
  max-width: 32em;
  font-size: clamp(15px, 1.4vw, 18px);
  line-height: 1.8;
  color: var(--mist);
}

.cover__aside { display: grid; gap: 16px; }

.cover__index {
  border-top: 1px solid var(--line);
}

.cover__index li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.cover__index span {
  font-family: var(--font-mono);
  color: var(--gold);
}

/* ---------- 11. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-top: calc(var(--header-h) + 26px);
  font-size: 13px;
  color: var(--mist);
}

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

.breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  font-family: var(--font-mono);
  color: var(--sand);
  opacity: 0.9;
}

.breadcrumbs a { color: var(--mist); text-decoration: none; transition: color 0.2s var(--ease); }
.breadcrumbs a:hover { color: var(--gold); }
.breadcrumbs [aria-current="page"] { color: var(--white); }

/* ---------- 12. 分段切换 ---------- */
.tabs { position: relative; }

.tablist {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  border-bottom: 1px solid var(--line-cool);
  margin-bottom: clamp(18px, 2.4vw, 28px);
}

.tab {
  position: relative;
  padding: 12px 16px;
  border: 0;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: color 0.2s var(--ease);
}

.tab:hover { color: var(--white); }
.tab[aria-selected="true"] { color: var(--gold); }

html:not(.has-js) .tab[aria-selected="true"] { border-bottom-color: var(--gold); }

.tablist__ink {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), var(--gold-light));
  transform: translateX(0);
  transition: transform 0.3s var(--ease), width 0.3s var(--ease);
  pointer-events: none;
}

.tab-panel { padding-top: 4px; }
.tab-panel[hidden] { display: none; }

/* ---------- 13. 折叠面板 ---------- */
.accordion { border-top: 1px solid var(--line-cool); }

.accordion__item { border-bottom: 1px solid var(--line-cool); }

.accordion__trigger {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
  border: 0;
  background: transparent;
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-align: left;
  cursor: pointer;
  transition: color 0.2s var(--ease);
}

.accordion__trigger:hover { color: var(--gold-light); }
.accordion__trigger[aria-expanded="true"] { color: var(--gold); }

.accordion__icon {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  color: currentColor;
}

.accordion__icon::before,
.accordion__icon::after {
  content: "";
  position: absolute;
  background: currentColor;
  transition: transform 0.24s var(--ease), opacity 0.24s var(--ease);
}

.accordion__icon::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  margin-top: -0.5px;
}

.accordion__icon::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  margin-left: -0.5px;
}

.accordion__trigger[aria-expanded="true"] .accordion__icon::after {
  transform: scaleY(0);
  opacity: 0;
}

.accordion__panel { padding: 0 0 20px; max-width: 34em; }
.accordion__panel[hidden] { display: none; }
.accordion__panel p { margin: 0 0 0.9em; font-size: 15px; line-height: 1.8; }

/* ---------- 14. 层叠目录 ---------- */
.toc {
  border-left: 1px solid var(--line-cool);
}

.toc__item { margin: 0; }

.toc__link {
  display: block;
  padding: 9px 0 9px 16px;
  margin-left: -1px;
  border-left: 1px solid transparent;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.toc__link:hover { color: var(--white); }

.toc__link[aria-current="true"] {
  color: var(--gold);
  border-left-color: var(--gold);
}

/* ---------- 15. 可复制数据 ---------- */
.copyable {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px;
  border: 1px dashed rgba(242, 193, 78, 0.42);
  border-radius: var(--radius);
  background: rgba(242, 193, 78, 0.08);
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--gold);
  cursor: pointer;
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.copyable:hover { background: rgba(242, 193, 78, 0.16); border-color: var(--gold); }

.copyable.is-copied {
  border-color: var(--emerald);
  color: var(--emerald);
}

.copyable__hint {
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
  opacity: 0.78;
}

/* ---------- 16. 媒体容器 ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--line-cool);
  border-radius: var(--radius);
  background: linear-gradient(150deg, rgba(19, 28, 60, 0.94), rgba(5, 10, 28, 0.96));
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 18, 48, 0) 42%, rgba(5, 10, 28, 0.74));
  pointer-events: none;
}

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

.media__glow {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(58% 58% at 28% 30%, rgba(242, 193, 78, 0.20), transparent 70%),
    radial-gradient(52% 52% at 82% 72%, rgba(226, 62, 140, 0.18), transparent 72%),
    radial-gradient(46% 46% at 60% 96%, rgba(127, 212, 255, 0.14), transparent 72%);
}

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }

.media__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
  opacity: 0.8;
}

/* ---------- 17. 进入视口显现 ---------- */
html.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.32s var(--ease), transform 0.32s var(--ease);
}

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

/* ---------- 18. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(40px, 6vw, 88px);
  padding-top: clamp(44px, 6vw, 80px);
  padding-bottom: 32px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(5, 10, 28, 0.55), #050A1C 42%);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) repeat(3, minmax(0, 1fr));
  gap: clamp(24px, 3.4vw, 48px);
}

.footer-brand { min-width: 0; }

.footer-brand__desc {
  margin: 18px 0 0;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.footer-brand__meta {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--gold);
  opacity: 0.82;
}

.footer-col { min-width: 0; }

.footer-col__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.22em;
  color: var(--gold);
}

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

.footer-links__item { margin: 0; }

.footer-link {
  display: inline-block;
  color: var(--mist);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s var(--ease), padding-left 0.2s var(--ease);
}

.footer-link:hover { color: var(--gold-light); padding-left: 4px; }
.footer-link[aria-current="page"] { color: var(--gold); }

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 32px;
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: 20px;
  border-top: 1px solid var(--line-cool);
  font-size: 13px;
  color: var(--mist);
}

.footer-contact__item { margin: 0; }

.footer-contact__value {
  font-family: var(--font-mono);
  color: var(--white);
  word-break: break-all;
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 24px;
  margin-top: 18px;
  font-size: 12px;
  color: var(--mist);
  opacity: 0.76;
}

.footer-meta__hours { margin: 0; }
.footer-meta__icp { margin: 0; font-family: var(--font-mono); letter-spacing: 0.06em; }
.footer-footnote { margin: 0; font-family: var(--font-mono); letter-spacing: 0.06em; }

/* ---------- 19. 响应式 ---------- */
@media (max-width: 1100px) {
  .cover__grid { grid-template-columns: minmax(0, 7fr) minmax(0, 4fr); }
  .cover__grid .vertical-note { display: none; }
}

@media (max-width: 960px) {
  .header-actions .btn { display: none; }
  .nav-toggle { display: inline-flex; }

  .header-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
    margin: 0;
    padding: calc(var(--header-h) + 28px) var(--gutter) 40px;
    overflow-y: auto;
    background: linear-gradient(180deg, rgba(5, 10, 28, 0.98), rgba(10, 18, 48, 0.99));
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity 0.26s var(--ease), transform 0.26s var(--ease), visibility 0.26s linear;
  }

  .header-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }

  body.nav-open { overflow: hidden; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    border-top: 1px solid var(--line);
  }

  .nav-list__item { border-bottom: 1px solid var(--line); }

  .nav-link {
    display: block;
    padding: 16px 2px;
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 0.04em;
  }

  .nav-link::after { display: none; }

  .nav-link[aria-current="page"] {
    padding-left: 14px;
    border-left: 2px solid var(--gold);
  }

  .section-head { grid-template-columns: minmax(0, 1fr); align-items: start; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  .cover__grid { grid-template-columns: minmax(0, 1fr); }
  .brand__tag { display: none; }
  .brand--footer .brand__tag { display: inline; }
  .media--tall { aspect-ratio: 4 / 5; }
}

@media (max-width: 600px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-contact { flex-direction: column; gap: 10px; }
  .footer-meta { flex-direction: column; align-items: flex-start; gap: 6px; }
}

/* ---------- 20. 降低动效 ---------- */
@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;
  }

  html.has-js [data-reveal],
  html.has-js [data-reveal].is-visible {
    opacity: 1 !important;
    transform: none !important;
  }

  .header-progress__bar { transition: none; }
}