/* ============================================================
   亚娱电子指南 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 基础组件
   ============================================================ */

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.7;
  letter-spacing: 0.005em;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, p, figure, blockquote { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
::selection { background: rgba(20, 224, 208, 0.28); color: #FFFFFF; }

:focus-visible {
  outline: 2px solid var(--cyan-500);
  outline-offset: 3px;
  border-radius: 2px;
}

#main-content { display: block; }

/* ---------- 2. Tokens ---------- */
:root {
  /* 色板 */
  --blue-900: #060B18;
  --blue-800: #0B1226;
  --blue-700: #111C3A;
  --white: #FFFFFF;
  --mist-100: #F4F7FB;
  --cyan-500: #14E0D0;
  --cyan-300: #7DF3EA;
  --orange-500: #FF8A3D;
  --gray-400: #8A9BB8;
  --line: rgba(255, 255, 255, 0.14);
  --line-strong: rgba(255, 255, 255, 0.26);

  /* 语义色（可被 .theme-light 局部翻转） */
  --bg: var(--blue-900);
  --bg-soft: var(--blue-800);
  --panel: var(--blue-700);
  --ink: var(--white);
  --ink-soft: rgba(255, 255, 255, 0.74);
  --ink-dim: var(--gray-400);

  /* 字体 */
  --font-sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "Cascadia Mono", Consolas, "Liberation Mono", Menlo, monospace;

  /* 尺度 */
  --rail-w: 236px;
  --header-h: 68px;
  --gutter: clamp(20px, 4vw, 56px);
  --radius: 3px;
  --shadow-soft: 0 18px 44px -26px rgba(0, 0, 0, 0.9);
  --glass: linear-gradient(150deg, rgba(20, 224, 208, 0.10), rgba(11, 18, 38, 0.58) 46%, rgba(255, 138, 61, 0.06));
  --ease: cubic-bezier(0.22, 0.72, 0.28, 1);
}

/* ---------- 3. 中文排版 ---------- */
.display {
  font-size: clamp(2.6rem, 6vw, 6rem);
  font-weight: 250;
  line-height: 1.02;
  letter-spacing: -0.04em;
}

.section-title {
  font-size: clamp(1.5rem, 2.6vw, 2.25rem);
  font-weight: 300;
  line-height: 1.24;
  letter-spacing: -0.03em;
}

.card__title,
.sub-title {
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: -0.01em;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan-500);
}

.lede {
  font-size: clamp(1.0625rem, 1.6vw, 1.25rem);
  line-height: 1.7;
  color: var(--ink-soft);
  max-width: 64ch;
}

.prose { max-width: 72ch; color: var(--ink-soft); }
.prose p + p { margin-top: 1.1em; }
.prose strong { color: var(--ink); font-weight: 600; }

.mono {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.01em;
  font-variant-numeric: tabular-nums;
}

.coord {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

/* ---------- 4. 布局工具 ---------- */
.shell {
  width: 100%;
  max-width: 1560px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(56px, 9vw, 120px); }
.section--tight { padding-block: clamp(36px, 5vw, 64px); }

.theme-light {
  --ink: #0B1226;
  --ink-soft: rgba(11, 18, 38, 0.74);
  --ink-dim: #5A6B88;
  --line: rgba(6, 11, 24, 0.12);
  --line-strong: rgba(6, 11, 24, 0.24);
  --panel: #FFFFFF;
  --glass: linear-gradient(150deg, rgba(20, 224, 208, 0.10), rgba(255, 255, 255, 0.9) 52%, rgba(255, 138, 61, 0.07));
  --shadow-soft: 0 18px 40px -30px rgba(6, 11, 24, 0.5);
  background: var(--mist-100);
  color: var(--ink);
}

.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); grid-template-columns: 1fr; }
.grid--2, .grid--3, .grid--split { grid-template-columns: 1fr; }
.stack { display: flex; flex-direction: column; gap: clamp(12px, 1.6vw, 20px); }
.rule { height: 1px; border: 0; margin: 0; background: var(--line); }

/* ---------- 5. 基础组件 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.2vw, 26px);
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
}

.card__meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--ink-dim);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
}

.tag--cyan { color: var(--cyan-300); border-color: rgba(20, 224, 208, 0.45); background: rgba(20, 224, 208, 0.08); }
.tag--orange { color: var(--orange-500); border-color: rgba(255, 138, 61, 0.45); background: rgba(255, 138, 61, 0.08); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  transition: color 0.22s var(--ease), background 0.22s var(--ease), border-color 0.22s var(--ease);
}

.btn:hover { border-color: var(--cyan-500); color: var(--cyan-300); background: rgba(20, 224, 208, 0.08); }
.btn--primary { color: #1A0C02; background: var(--orange-500); border-color: var(--orange-500); }
.btn--primary:hover { color: #1A0C02; background: #FFA15E; border-color: #FFA15E; }
.btn--ghost { color: var(--cyan-300); border-color: rgba(20, 224, 208, 0.42); background: transparent; }
.btn--ghost:hover { color: var(--blue-900); background: var(--cyan-500); border-color: var(--cyan-500); }
.btn--quiet { padding-inline: 0; border-color: transparent; background: none; color: var(--cyan-300); }
.btn--quiet:hover { background: none; border-color: transparent; color: var(--cyan-500); }

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--ink-dim);
}

.breadcrumbs a { color: var(--ink-soft); }
.breadcrumbs a:hover { color: var(--cyan-300); }
.breadcrumbs li { display: inline-flex; align-items: center; gap: 6px; }
.breadcrumbs li + li::before { content: "/"; color: var(--line-strong); }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
  font-size: 0.8125rem;
  color: var(--ink-soft);
}

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

.legend__swatch {
  width: 10px;
  height: 10px;
  flex: none;
  border: 1px solid var(--line-strong);
}

.legend__swatch--cyan { background: var(--cyan-500); border-color: var(--cyan-500); }
.legend__swatch--orange { background: var(--orange-500); border-color: var(--orange-500); }
.legend__swatch--line { background: transparent; }

.stat__value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(1.75rem, 3.4vw, 2.75rem);
  letter-spacing: -0.02em;
  color: var(--cyan-300);
}

/* 通用图片容器 */
.media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(20, 224, 208, 0.09), rgba(6, 11, 24, 0.92) 55%, rgba(255, 138, 61, 0.07));
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 46px 46px;
  opacity: 0.55;
  pointer-events: none;
}

.media img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--3x4 { aspect-ratio: 3 / 4; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--wide { aspect-ratio: 21 / 9; }

/* ---------- 6. 头部 ---------- */
.skip-link {
  position: absolute;
  top: -72px;
  left: 12px;
  z-index: 120;
  padding: 10px 16px;
  font-size: 0.875rem;
  font-weight: 600;
  color: #02131A;
  background: var(--cyan-500);
  border-radius: var(--radius);
  transition: top 0.2s var(--ease);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 70;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 95;
  pointer-events: none;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan-500), var(--orange-500));
}

.site-header__bar {
  background: linear-gradient(180deg, rgba(6, 11, 24, 0.96), rgba(6, 11, 24, 0.84));
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.8vw, 24px);
  min-height: var(--header-h);
  padding-block: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  white-space: nowrap;
}

.brand__mark {
  width: 9px;
  height: 9px;
  flex: none;
  border: 1px solid var(--cyan-500);
  background: linear-gradient(135deg, var(--cyan-500), rgba(20, 224, 208, 0) 72%);
  transform: rotate(45deg);
}

.brand__name {
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.18em;
  color: var(--ink-dim);
  padding-top: 2px;
}

.brand-note {
  display: none;
  padding-left: clamp(12px, 1.6vw, 22px);
  border-left: 1px solid var(--line);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--ink-dim);
}

.header-utils {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: clamp(6px, 1.2vw, 12px);
}

.util-link {
  display: inline-flex;
  align-items: center;
  padding: 9px 14px;
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: color 0.22s var(--ease), background 0.22s var(--ease), border-color 0.22s var(--ease);
}

.util-link:hover {
  color: var(--cyan-300);
  border-color: rgba(20, 224, 208, 0.4);
  background: rgba(20, 224, 208, 0.06);
}

.util-link--accent {
  font-weight: 600;
  color: #1A0C02;
  background: var(--orange-500);
  border-color: var(--orange-500);
}

.util-link--accent:hover {
  color: #1A0C02;
  background: #FFA15E;
  border-color: #FFA15E;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  font-size: 0.8125rem;
  color: var(--ink);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.nav-toggle:hover { color: var(--cyan-300); border-color: var(--cyan-500); }

.nav-toggle__bars { display: inline-flex; flex-direction: column; gap: 3px; width: 14px; }
.nav-toggle__bars span { display: block; height: 1px; background: currentColor; }
.nav-toggle__bars span:nth-child(2) { width: 70%; }
.nav-toggle__label { letter-spacing: 0.06em; }

/* 索引导航：移动端为抽屉，桌面端为固定左栏 */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 80;
  width: min(86vw, 340px);
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: calc(var(--header-h) + 24px) 20px 28px;
  background: linear-gradient(180deg, #0B1226, #060B18 68%);
  border-right: 1px solid var(--line);
  box-shadow: 26px 0 60px -32px rgba(0, 0, 0, 0.95);
  overflow-y: auto;
  transform: translateX(-102%);
  transition: transform 0.34s var(--ease);
}

.site-nav[data-open] { transform: translateX(0); }

.site-nav__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan-500);
}

.site-nav__list { display: flex; flex-direction: column; gap: 2px; }

.site-nav__item { margin: 0; }

.site-nav__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 14px;
  color: var(--ink-soft);
  font-size: 1rem;
  line-height: 1.3;
  border: 1px solid transparent;
  border-radius: 2px;
  transition: color 0.22s var(--ease), background 0.22s var(--ease), border-color 0.22s var(--ease);
}

.site-nav__num {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
  transition: color 0.22s var(--ease);
}

.site-nav__text { letter-spacing: 0.01em; }

.site-nav__link:hover {
  color: var(--white);
  background: rgba(20, 224, 208, 0.08);
  border-color: rgba(20, 224, 208, 0.24);
}

.site-nav__link:hover .site-nav__num { color: var(--cyan-300); }

.site-nav__link[aria-current="page"] {
  color: var(--white);
  background: rgba(20, 224, 208, 0.1);
  border-color: rgba(20, 224, 208, 0.36);
}

.site-nav__link[aria-current="page"] .site-nav__num { color: var(--cyan-500); }

.site-nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--cyan-500);
}

.site-nav__meta {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.site-nav__meta-line {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--ink-dim);
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  background: linear-gradient(180deg, var(--blue-800), var(--blue-900) 62%);
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(20, 224, 208, 0.5), transparent);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  padding-block: clamp(44px, 6vw, 72px);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}

.footer-note {
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--ink-dim);
  max-width: 34ch;
}

.to-top {
  position: fixed;
  right: clamp(16px, 3vw, 32px);
  bottom: clamp(16px, 3vw, 32px);
  z-index: 60;
  padding: 11px 16px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--cyan-300);
  background: rgba(6, 11, 24, 0.9);
  border: 1px solid rgba(20, 224, 208, 0.4);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: color 0.22s var(--ease), background 0.22s var(--ease);
}

.to-top[hidden] { display: none; }
.to-top:hover { color: var(--white); background: rgba(20, 224, 208, 0.16); }

.footer-nav {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 36px);
}

.footer-col__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-500);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.875rem;
}

.footer-list a { color: var(--ink-soft); transition: color 0.2s var(--ease); }
.footer-list a:hover { color: var(--cyan-300); }

.footer-list--plain li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

.footer-list--plain .mono { color: var(--ink); font-size: 0.8125rem; word-break: break-all; }

.footer-hint {
  margin-top: 12px;
  font-size: 0.75rem;
  color: var(--ink-dim);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 22px;
  padding-block: 20px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--ink-dim);
}

.footer-base__copy { margin: 0; }
.footer-base__icp { margin: 0; }
.footer-base__link { margin-left: auto; color: var(--cyan-300); }
.footer-base__link:hover { color: var(--white); }

/* ---------- 8. 显现动效 ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}

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

/* ---------- 9. 响应式 ---------- */
@media (min-width: 640px) {
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 720px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 860px) {
  .footer-inner { grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); }
  .footer-nav { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .brand-note { display: block; }
}

@media (min-width: 1080px) {
  .shell { padding-left: calc(var(--rail-w) + clamp(24px, 3vw, 52px)); }

  .nav-toggle { display: none; }

  .site-nav {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 65;
    width: var(--rail-w);
    gap: 14px;
    padding: calc(var(--header-h) + 34px) 22px 30px;
    background: linear-gradient(180deg, rgba(11, 18, 38, 0.94), rgba(6, 11, 24, 0.99));
    border-right: 1px solid var(--line);
    box-shadow: none;
    overflow: visible;
    transform: none;
    transition: none;
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
  }

  .site-nav[data-open] { transform: none; }
  .site-nav__list { gap: 2px; }
  .site-nav__meta { margin-top: auto; }

  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--split { grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); }
}

@media (min-width: 1280px) {
  .media--3x4 { aspect-ratio: 3 / 4; }
}

@media (max-width: 560px) {
  .util-link:not(.util-link--accent) { display: none; }
  .brand__sub { display: none; }
}

@media (max-width: 599px) {
  .media--3x4 { aspect-ratio: 4 / 3; }
  .footer-base__link { margin-left: 0; }
}

/* ---------- 10. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

  .site-nav,
  .skip-link,
  .btn,
  .util-link,
  .nav-toggle,
  .to-top,
  .site-nav__link,
  .footer-list a {
    transition: none !important;
  }
}