/* ==========================================================================
   博奥看台 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 基础组件
   ========================================================================== */

*,
*::before,
*::after { box-sizing: border-box; }

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

html,
body { overflow-x: hidden; }

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

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

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

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

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

main { display: block; }

/* ---------------------------------------------------------------- 变量 */
:root {
  /* 品牌色 */
  --ink: #071A14;
  --char: #101418;
  --lime: #C8FF3D;
  --orange: #FF6A2B;
  --red: #C43A3A;
  --bone: #F4F1E8;
  --mist: #A8B8B0;
  --teal: #123C3A;
  --indigo: #2A2B57;
  --wine: #4A1F2B;

  /* 派生 */
  --surface: #0A211A;
  --line: rgba(168, 184, 176, 0.22);
  --line-strong: rgba(168, 184, 176, 0.42);
  --lime-soft: rgba(200, 255, 61, 0.12);

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-display: "Arial Narrow", "Helvetica Neue", Helvetica, "PingFang SC",
    "Microsoft YaHei", sans-serif;
  --font-num: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono",
    monospace;

  /* 形状 */
  --r-lg: 28px;
  --r-md: 18px;
  --r-sm: 12px;
  --r-pill: 999px;
  --r-btn: 16px;

  /* 节奏 */
  --shell: 1180px;
  --pad: clamp(16px, 4vw, 40px);
  --header-h: 66px;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 220ms;
}

/* ---------------------------------------------------------------- 基础 */
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0.01em;
  color: var(--bone);
  background-color: var(--ink);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

@media (max-width: 1024px) {
  body { padding-bottom: calc(66px + env(safe-area-inset-bottom, 0px)); }
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.015em;
}

p { text-wrap: pretty; }

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

:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------------------------------------------------------------- 布局壳 */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.grid { display: grid; gap: clamp(12px, 2vw, 20px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--bento { grid-template-columns: repeat(12, minmax(0, 1fr)); }

@media (max-width: 900px) {
  .grid--2,
  .grid--3 { grid-template-columns: 1fr; }
  .grid--bento { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ---------------------------------------------------------------- 跳转链接 */
.skip-link {
  position: absolute;
  left: 14px;
  top: -72px;
  z-index: 90;
  display: inline-block;
  padding: 11px 20px;
  border-radius: 0 0 14px 14px;
  background: var(--lime);
  color: var(--ink);
  font-size: 14px;
  font-weight: 800;
  transition: top 160ms var(--ease);
}

.skip-link:focus { top: 0; }

/* ================================================================ 头部 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(7, 26, 20, 0.94);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  color: var(--bone);
}

.header-bar {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 24px);
  min-height: var(--header-h);
  padding-block: 10px;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  transition: opacity var(--dur) var(--ease);
}

.brand:hover { opacity: 0.85; }

.brand__mark {
  flex: 0 0 auto;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  color: var(--ink);
  background: linear-gradient(148deg, var(--lime) 0%, #8FD91C 100%);
  box-shadow: 0 0 0 1px rgba(200, 255, 61, 0.25), 0 6px 18px rgba(200, 255, 61, 0.16);
}

.brand__text { display: block; }

.brand__name {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: 0.02em;
  line-height: 1.1;
  color: var(--bone);
}

.brand__line {
  display: block;
  font-size: 10.5px;
  line-height: 1.3;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.brand--footer .brand__name { font-size: 21px; }

/* 命令栏导航 */
.cmdbar {
  flex: 1 1 auto;
  display: flex;
  justify-content: center;
  min-width: 0;
}

.cmdbar__list {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: rgba(18, 60, 58, 0.5);
}

.cmdbar__item { position: relative; }

.cmdbar__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: var(--r-pill);
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  color: var(--mist);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.cmdbar__link:hover {
  color: var(--bone);
  background: var(--lime-soft);
}

.cmdbar__idx {
  font-family: var(--font-num);
  font-size: 10px;
  letter-spacing: -0.02em;
  color: var(--mist);
  opacity: 0.7;
}

.cmdbar__link[aria-current="page"] {
  color: var(--bone);
  background: var(--lime-soft);
}

.cmdbar__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -1px;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--lime);
  transform: translateX(-50%);
}

.cmdbar__link[aria-current="page"] .cmdbar__idx {
  color: var(--lime);
  opacity: 1;
}

/* 头部右侧 */
.header-actions {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: var(--r-btn);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.01em;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease),
    border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.btn--lime {
  background: var(--lime);
  color: var(--ink);
  box-shadow: 0 8px 22px rgba(200, 255, 61, 0.16);
}

.btn--lime:hover {
  background: #D6FF66;
  transform: translateY(-2px);
}

.btn--ghost {
  background: transparent;
  color: var(--bone);
  border-color: var(--line-strong);
}

.btn--ghost:hover {
  border-color: var(--lime);
  color: var(--lime);
  transform: translateY(-2px);
}

.btn--sm { padding: 9px 15px; font-size: 13px; border-radius: 13px; }
.btn--block { width: 100%; }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 13px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: rgba(18, 60, 58, 0.7);
  color: var(--bone);
  font-size: 13px;
  font-weight: 700;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.nav-toggle__bars {
  display: grid;
  gap: 5px;
  width: 16px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--lime);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child {
  transform: translateY(3.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child {
  transform: translateY(-3.5px) rotate(-45deg);
}

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

.header-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--lime) 0%, var(--orange) 72%, var(--red) 100%);
  transition: width 90ms linear;
}

/* ---------------------------------------------------------- 头部响应式 */
@media (max-width: 1120px) {
  .cmdbar__idx { display: none; }
  .cmdbar__link { padding: 8px 10px; font-size: 12.5px; }
}

@media (max-width: 1024px) {
  .nav-toggle { display: inline-flex; }

  .cmdbar {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 70;
    display: block;
    max-height: 0;
    padding: 0 var(--pad);
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 26px 44px rgba(0, 0, 0, 0.5);
    transition: max-height 260ms var(--ease), opacity 200ms var(--ease),
      padding 260ms var(--ease), visibility 0s linear 260ms;
  }

  .cmdbar[data-open] {
    max-height: min(72vh, 520px);
    padding: 12px var(--pad) 20px;
    overflow-y: auto;
    opacity: 1;
    visibility: visible;
    transition: max-height 300ms var(--ease), opacity 200ms var(--ease),
      padding 260ms var(--ease), visibility 0s;
  }

  .cmdbar__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 0;
    border: 0;
    background: transparent;
    border-radius: 0;
  }

  .cmdbar__link {
    justify-content: flex-start;
    padding: 13px 16px;
    border-radius: 14px;
    font-size: 15px;
    color: var(--bone);
  }

  .cmdbar__link[aria-current="page"] {
    background: rgba(200, 255, 61, 0.14);
    color: var(--lime);
  }

  .cmdbar__link[aria-current="page"]::after { display: none; }

  .header-actions { gap: 8px; }
}

@media (max-width: 620px) {
  .header-actions .btn--lime { display: none; }
  .brand__line { display: none; }
  .brand__name { font-size: 17px; }
}

/* ================================================================ 页脚 */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 96px);
  padding-block: clamp(38px, 6vw, 74px) clamp(22px, 3vw, 30px);
  color: var(--bone);
  background-color: var(--char);
  background-image:
    radial-gradient(780px 300px at 8% -12%, rgba(42, 43, 87, 0.62), transparent 70%),
    radial-gradient(720px 280px at 92% -8%, rgba(74, 31, 43, 0.55), transparent 70%),
    radial-gradient(560px 240px at 50% 108%, rgba(18, 60, 58, 0.5), transparent 72%);
  border-top: 1px solid var(--line);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--lime) 0%, var(--orange) 48%, var(--red) 100%);
  opacity: 0.9;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 2fr);
  gap: clamp(26px, 5vw, 64px);
  padding-top: clamp(6px, 1.6vw, 16px);
}

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

.brand--footer {
  display: inline-flex;
  align-items: center;
  gap: 11px;
}

.footer-brand__summary {
  max-width: 32ch;
  margin-block: 16px 20px;
  font-size: 15px;
  color: var(--mist);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 34px);
}

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

.footer-col__title {
  margin-bottom: 14px;
  font-family: var(--font-num);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--lime);
}

.footer-col__list {
  display: grid;
  gap: 9px;
}

.footer-col__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  font-size: 14.5px;
  color: var(--mist);
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.footer-col__link::before {
  content: "›";
  font-size: 13px;
  line-height: 1;
  color: rgba(168, 184, 176, 0.5);
  transition: color var(--dur) var(--ease);
}

.footer-col__link:hover { color: var(--lime); }
.footer-col__link:hover::before { color: var(--lime); }

.footer-col--contact .footer-col__title { color: var(--orange); }

.footer-col__item {
  font-size: 14px;
  line-height: 1.65;
  color: var(--mist);
  word-break: break-word;
}

.footer-col__item:first-child {
  font-family: var(--font-num);
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--bone);
}

.footer-col__note {
  margin-top: 12px;
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(168, 184, 176, 0.78);
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  margin-top: clamp(30px, 4.5vw, 52px);
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.footer-legal__link {
  font-size: 13.5px;
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}

.footer-legal__link:hover { color: var(--bone); }

.footer-icp {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: rgba(168, 184, 176, 0.72);
}

/* 移动端底栏直达条 */
.dock { display: none; }

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

  .dock {
    display: block;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 75;
    padding: 6px 8px calc(6px + env(safe-area-inset-bottom, 0px));
    background: rgba(9, 32, 26, 0.96);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    border-top: 1px solid var(--line);
    box-shadow: 0 -14px 30px rgba(0, 0, 0, 0.45);
  }

  .dock__list {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 4px;
  }

  .dock__item { min-width: 0; }

  .dock__link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: 8px 4px;
    border-radius: 14px;
    font-size: 11.5px;
    font-weight: 600;
    color: var(--mist);
    transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
  }

  .dock__link:hover,
  .dock__link[aria-current="page"] { color: var(--bone); }

  .dock__icon {
    font-family: var(--font-num);
    font-size: 11px;
    letter-spacing: -0.02em;
    opacity: 0.65;
  }

  .dock__link--key {
    background: var(--lime);
    color: var(--ink);
  }

  .dock__link--key:hover { background: #D6FF66; color: var(--ink); }
  .dock__link--key .dock__icon { opacity: 0.6; }
}

@media (max-width: 480px) {
  .footer-nav { grid-template-columns: 1fr; }
  .footer-meta { flex-direction: column; align-items: flex-start; }
}

/* ================================================================ 基础组件 */
/* 面包屑 */
.breadcrumbs { margin-bottom: 18px; font-size: 13px; }

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  color: var(--mist);
}

.breadcrumbs__item { display: inline-flex; align-items: center; gap: 6px; }

.breadcrumbs__item:not(:last-child)::after {
  content: "/";
  color: rgba(168, 184, 176, 0.42);
}

.breadcrumbs__link {
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}

.breadcrumbs__link:hover { color: var(--lime); }

.breadcrumbs__item[aria-current="page"] { color: var(--bone); }

/* 章节开篇 */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-num);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--lime);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: var(--lime);
}

.section-title {
  margin-top: 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 4.4vw, 48px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--bone);
}

.lede {
  max-width: 60ch;
  margin-top: 14px;
  font-size: clamp(15px, 1.5vw, 17.5px);
  line-height: 1.72;
  color: var(--mist);
}

/* 长文 */
.prose { max-width: 68ch; }

.prose p {
  margin-bottom: 1.05em;
  color: rgba(244, 241, 232, 0.87);
}

.prose p:last-child { margin-bottom: 0; }

.prose h2,
.prose h3 {
  margin: 1.7em 0 0.6em;
  color: var(--bone);
}

.prose a {
  color: var(--lime);
  border-bottom: 1px solid rgba(200, 255, 61, 0.4);
}

.prose a:hover { border-bottom-color: var(--lime); }

/* 卡片 */
.card {
  position: relative;
  padding: clamp(18px, 2.8vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--teal);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.card:hover {
  transform: translateY(-2px);
  border-color: rgba(200, 255, 61, 0.5);
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.32);
}

.card--char { background: var(--char); }
.card--indigo { background: var(--indigo); }
.card--wine { background: var(--wine); }

.card__label {
  display: block;
  font-family: var(--font-num);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--lime);
}

.card--wine .card__label { color: var(--orange); }

.card__title {
  margin-top: 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--bone);
}

.card__text {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.68;
  color: var(--mist);
}

/* 数据锚点 */
.stat { display: grid; gap: 2px; }

.stat__num {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(32px, 6vw, 58px);
  line-height: 0.95;
  letter-spacing: -0.035em;
  color: var(--lime);
}

.stat__unit {
  margin-left: 0.28em;
  font-size: 0.34em;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.stat__label {
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--mist);
}

/* 胶囊 */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  font-size: 12.5px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--bone);
}

.pill--lime { background: var(--lime); border-color: transparent; color: var(--ink); }
.pill--orange { background: var(--orange); border-color: transparent; color: var(--ink); }
.pill--red { background: var(--red); border-color: transparent; color: var(--bone); }

.pill__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* 图片容器 */
.media {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border-radius: var(--r-lg);
  background-color: var(--teal);
  background-image:
    radial-gradient(120% 90% at 18% 0%, rgba(200, 255, 61, 0.16), transparent 62%),
    linear-gradient(158deg, rgba(18, 60, 58, 0.95) 0%, rgba(42, 43, 87, 0.9) 100%);
}

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

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(180deg, transparent 42%, rgba(7, 26, 20, 0.78) 100%);
}

.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }

.media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 14px 18px;
  font-size: 12.5px;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--bone);
}

/* 章节编号链接 */
.chapter-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: 13px;
  color: var(--mist);
  transition: color var(--dur) var(--ease);
}

.chapter-link__idx {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: -0.02em;
  opacity: 0.6;
}

.chapter-link:hover { color: var(--bone); }

.chapter-link[aria-current="true"] { color: var(--lime); }

[data-chapter] { scroll-margin-top: calc(var(--header-h) + 24px); }

#main-content { scroll-margin-top: calc(var(--header-h) + 12px); }

/* 进场轻显 */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
}

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

/* ---------------------------------------------------------- 动效收敛 */
@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;
  }

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

  .card:hover,
  .btn--lime:hover,
  .btn--ghost:hover,
  .footer-col__link:hover {
    transform: none;
  }
}