:root {
  --ink-900: #0A1B2A;
  --ink-800: #122E45;
  --teal-900: #123B3A;
  --indigo-900: #29234A;
  --wine-900: #5A2230;
  --coral: #FF6B4A;
  --signal: #2ED47A;
  --gold: #C9A227;
  --paper: #F4F0E6;
  --paper-hi: #FBF8F0;
  --slate: #8FA3B8;
  --black: #101820;

  --line: rgba(143, 163, 184, 0.30);
  --line-strong: rgba(143, 163, 184, 0.55);
  --line-dark: rgba(16, 24, 32, 0.14);

  --font-display: "Source Han Serif SC", "Noto Serif SC", "Songti SC", STSong, SimSun, serif;
  --font-body: "HarmonyOS Sans SC", "Inter", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --r-sm: 2px;
  --r-md: 4px;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 240ms;

  --shadow-paper: 0 1px 0 rgba(16, 24, 32, 0.06), 0 18px 40px -30px rgba(10, 27, 42, 0.60);
  --shadow-plate: 0 22px 48px -32px rgba(10, 27, 42, 0.85);

  --container: 1360px;
  --gutter: clamp(16px, 3.6vw, 44px);

  --scroll-progress: 0;
}

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

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

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

ul, ol { list-style: none; }

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

button { font: inherit; color: inherit; }

hr {
  border: 0;
  border-top: 1px solid var(--line-dark);
}

body {
  min-height: 100vh;
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(16, 24, 32, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 24, 32, 0.035) 1px, transparent 1px);
  background-size: 100% 32px, 32px 100%;
  color: var(--black);
  font-family: var(--font-body);
  font-size: clamp(15px, 0.95rem + 0.18vw, 17px);
  line-height: 1.78;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: 0.01em;
}

p { max-width: 46ch; }

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--coral);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

/* ---------- 通用容器 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.prose {
  max-width: 42rem;
}

.prose > * + * {
  margin-top: 1em;
}

.prose p {
  max-width: none;
  color: rgba(16, 24, 32, 0.86);
}

.prose a {
  color: var(--wine-900);
  text-decoration: none;
  border-bottom: 1px solid var(--coral);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.prose a:hover {
  color: var(--coral);
}

.divider {
  height: 1px;
  background: var(--line-dark);
  margin-block: clamp(24px, 3vw, 40px);
}

/* ---------- 跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  transform: translateY(-180%);
  padding: 10px 16px;
  background: var(--coral);
  color: var(--black);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  border-radius: var(--r-sm);
  transition: transform 180ms var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- 头部（档案书脊框架） ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(180deg, var(--ink-900) 0%, var(--ink-900) 64%, var(--ink-800) 100%);
  color: var(--paper);
  border-bottom: 1px solid rgba(201, 162, 39, 0.34);
  box-shadow: 0 8px 24px -18px rgba(0, 0, 0, 0.9);
}

.site-header::before {
  content: "";
  display: block;
  height: 3px;
  background:
    linear-gradient(90deg,
      var(--coral) 0 13%,
      var(--gold) 13% 19%,
      rgba(143, 163, 184, 0.22) 19% 100%);
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--coral), var(--gold));
  transform: scaleX(var(--scroll-progress));
  transform-origin: 0 50%;
  transition: transform 110ms linear;
  pointer-events: none;
}

.header-inner {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.8vw, 30px);
  padding-block: 12px;
}

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

.brand-mark {
  position: relative;
  width: 26px;
  height: 36px;
  border: 1px solid rgba(201, 162, 39, 0.72);
  border-radius: var(--r-sm);
  background: linear-gradient(180deg, rgba(201, 162, 39, 0.22), rgba(201, 162, 39, 0));
  flex: 0 0 auto;
}

.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  left: 5px;
  right: 5px;
  height: 1px;
  background: rgba(201, 162, 39, 0.75);
}

.brand-mark::before { top: 9px; }
.brand-mark::after { bottom: 9px; }

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

.brand-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--paper);
}

.brand-sub {
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--slate);
}

/* 移动目录按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-sm);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}

.nav-toggle-bars span {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.nav-toggle[aria-expanded="true"] {
  border-color: var(--coral);
  color: var(--coral);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:first-child {
  transform: translateY(2.75px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:last-child {
  transform: translateY(-2.75px) rotate(-45deg);
}

/* 主导航 */
.site-nav {
  flex: 0 1 auto;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 10px;
  font-size: 14px;
  line-height: 1.3;
  color: rgba(244, 240, 230, 0.78);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  border-radius: var(--r-sm);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav-num {
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1.5;
  letter-spacing: 0.06em;
  padding: 1px 4px;
  color: var(--slate);
  border: 1px solid var(--line);
  border-radius: 2px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.nav-link:hover {
  color: #fff;
  background: rgba(255, 107, 74, 0.12);
}

.nav-link:hover .nav-num {
  color: var(--coral);
  border-color: var(--coral);
}

.nav-link[aria-current="page"] {
  color: #fff;
  border-bottom-color: var(--coral);
}

.nav-link[aria-current="page"] .nav-num {
  background: var(--coral);
  border-color: var(--coral);
  color: var(--black);
}

/* 右侧工具区 */
.header-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  flex: 0 0 auto;
}

.version-badge {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 4px 8px;
  color: var(--gold);
  border: 1px solid rgba(201, 162, 39, 0.60);
  border-radius: var(--r-sm);
  text-decoration: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.version-badge:hover {
  background: var(--gold);
  color: var(--ink-900);
}

/* 快捷轴 */
.axis-rail {
  background: var(--ink-800);
  border-top: 1px solid var(--line);
}

.axis-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-block: 7px;
  overflow-x: auto;
  scrollbar-width: none;
}

.axis-inner::-webkit-scrollbar { display: none; }

.axis-label {
  flex: 0 0 auto;
  padding-right: 12px;
  border-right: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.20em;
  color: var(--slate);
  white-space: nowrap;
}

.axis-list {
  display: flex;
  align-items: center;
  gap: 6px;
}

.axis-link {
  display: inline-block;
  padding: 4px 10px;
  font-size: 12.5px;
  white-space: nowrap;
  color: rgba(244, 240, 230, 0.74);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.axis-link:hover {
  color: var(--coral);
  border-color: var(--coral);
  background: rgba(255, 107, 74, 0.10);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.3;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.btn--primary {
  background: var(--coral);
  border-color: var(--coral);
  color: var(--black);
}

.btn--primary:hover {
  background: #ff8a6e;
  border-color: #ff8a6e;
  transform: translateY(-1px);
}

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

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

.btn--outline {
  background: transparent;
  border-color: rgba(16, 24, 32, 0.26);
  color: var(--ink-900);
}

.btn--outline:hover {
  border-color: var(--coral);
  color: var(--wine-900);
}

.btn--sm {
  padding: 8px 14px;
  font-size: 13px;
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  padding-block: clamp(32px, 5vw, 64px) 0;
  background: linear-gradient(180deg, var(--ink-900) 0%, #0d2133 48%, var(--teal-900) 100%);
  color: rgba(244, 240, 230, 0.80);
  border-top: 1px solid rgba(201, 162, 39, 0.30);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 96px;
  height: 2px;
  background: var(--gold);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: clamp(24px, 4vw, 56px);
  padding-bottom: clamp(24px, 3vw, 40px);
  border-bottom: 1px solid var(--line);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}

.footer-tag {
  display: inline-block;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--gold);
  border: 1px solid rgba(201, 162, 39, 0.55);
  border-radius: var(--r-sm);
}

.footer-name {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--paper);
  max-width: none;
}

.footer-note {
  max-width: 36ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
}

.footer-blocks {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 2.4vw, 32px);
}

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

.footer-h {
  max-width: none;
  margin-bottom: 12px;
  padding-left: 10px;
  position: relative;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.20em;
  color: var(--gold);
}

.footer-h::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 4px;
  height: 4px;
  background: var(--coral);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(244, 240, 230, 0.72);
  word-break: break-word;
}

.footer-list a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-list a:hover {
  color: var(--coral);
  border-bottom-color: var(--coral);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-block: 18px 26px;
  border-top: 1px solid rgba(143, 163, 184, 0.18);
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 20px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: rgba(244, 240, 230, 0.55);
}

.footer-icp {
  padding: 2px 7px;
  border: 1px solid rgba(143, 163, 184, 0.30);
  border-radius: var(--r-sm);
}

.footer-copy { color: rgba(244, 240, 230, 0.55); }

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: clamp(18px, 2.4vw, 28px) 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: rgba(16, 24, 32, 0.55);
}

.breadcrumbs a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.breadcrumbs a:hover {
  color: var(--wine-900);
  border-bottom-color: var(--coral);
}

.crumb-sep {
  opacity: 0.55;
}

/* ---------- 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(16px, 2.2vw, 28px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* ---------- 区块标题 ---------- */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 20px;
  margin-bottom: clamp(16px, 2vw, 26px);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-dark);
}

.eyebrow {
  display: inline-block;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--wine-900);
  border: 1px solid rgba(90, 34, 48, 0.35);
  border-radius: var(--r-sm);
  max-width: none;
}

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  padding: clamp(16px, 2vw, 26px);
  background: var(--paper-hi);
  border: 1px solid var(--line-dark);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-paper);
}

.card > p { max-width: 40ch; }

.card--paper { background: var(--paper-hi); }

.card--plate {
  background: var(--ink-800);
  border-color: rgba(143, 163, 184, 0.32);
  color: var(--paper);
  box-shadow: var(--shadow-plate);
}

.card--plate p { color: rgba(244, 240, 230, 0.76); }

.card--teal {
  background: var(--teal-900);
  border-color: rgba(46, 212, 122, 0.26);
  color: var(--paper);
  box-shadow: var(--shadow-plate);
}

.card--teal p { color: rgba(244, 240, 230, 0.76); }

/* ---------- 展签与编号 ---------- */
.label-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--slate);
  background: rgba(244, 240, 230, 0.08);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
}

.label-tag--gold {
  color: var(--gold);
  border-color: rgba(201, 162, 39, 0.55);
}

.num-frame {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 30px;
  padding: 2px 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--coral);
  border: 1px solid rgba(255, 107, 74, 0.55);
  border-radius: var(--r-sm);
}

.status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--slate);
  vertical-align: middle;
}

.status-dot--done { background: var(--signal); }
.status-dot--wait { background: var(--gold); }

/* ---------- 图片容器基础 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--ink-800);
  border: 1px solid var(--line-dark);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-paper);
}

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

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }

/* ---------- 进度 ---------- */
.progress-track {
  position: relative;
  width: 100%;
  height: 6px;
  background: rgba(143, 163, 184, 0.24);
  border-radius: 1px;
  overflow: hidden;
}

.progress-fill {
  display: block;
  height: 100%;
  width: 0;
  background: var(--coral);
  transition: width 260ms var(--ease), background var(--dur) var(--ease);
}

.progress-fill.is-done {
  width: 100%;
  background: var(--signal);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1180px) {
  .nav-link {
    padding: 10px 7px;
    font-size: 13px;
    gap: 6px;
  }

  .nav-num {
    display: none;
  }

  .header-cta {
    display: none;
  }
}

@media (max-width: 960px) {
  .header-inner {
    flex-wrap: wrap;
    row-gap: 0;
  }

  .brand { order: 1; }

  .nav-toggle {
    display: inline-flex;
    order: 2;
    margin-left: auto;
  }

  .header-tools {
    order: 3;
    margin-left: 0;
    gap: 8px;
  }

  .header-cta { display: none; }

  .site-nav {
    order: 4;
    flex: 0 0 100%;
    width: 100%;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    border-top: 1px solid transparent;
    transition: max-height 280ms var(--ease), opacity 200ms var(--ease);
  }

  .site-nav[data-open="true"] {
    max-height: 70vh;
    overflow-y: auto;
    opacity: 1;
    margin-top: 10px;
    border-top-color: var(--line);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-bottom: 10px;
  }

  .nav-link {
    justify-content: flex-start;
    padding: 12px 2px;
    font-size: 15px;
    border-bottom: 1px solid var(--line);
    border-radius: 0;
  }

  .nav-num {
    display: inline-block;
    font-size: 10.5px;
  }

  .nav-link[aria-current="page"] {
    border-bottom-color: var(--coral);
    background: rgba(255, 107, 74, 0.10);
  }

  .footer-top {
    grid-template-columns: minmax(0, 1fr);
  }

  .grid--2,
  .grid--3 {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 640px) {
  .brand-name { font-size: 16px; }
  .brand-sub { font-size: 9.5px; letter-spacing: 0.10em; }
  .brand-mark { width: 22px; height: 30px; }

  .nav-toggle {
    padding: 8px 10px;
    letter-spacing: 0.10em;
  }

  .footer-blocks {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .btn {
    width: 100%;
  }

  .header-tools .version-badge { font-size: 11px; }
}

/* ---------- 动效偏好 ---------- */
@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;
  }

  .site-header::after { transition: none; }
}

/* ---------- 打印 ---------- */
@media print {
  .site-header,
  .site-footer,
  .skip-link,
  .nav-toggle {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
    font-size: 12pt;
  }
}