@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@300;400;500;600;700&family=Share+Tech+Mono&display=swap');

/* ===========================
   CSS 自定义属性
   =========================== */
:root {
  --c-primary: #c8e0f4;
  --c-accent: #f5e0e8;
  --c-dark: #171f26;
  --c-bg: #daeaf6;
  --c-bg-alt: #f8eff3;
  --c-surface: #cde3f5;
  --c-surface-alt: #f3dde8;
  --c-text: #171f26;
  --c-text-muted: #445566;
  --c-text-light: #6a7f92;
  --c-border: rgba(23,31,38,0.12);
  --c-shadow-dark: rgba(23,31,38,0.18);
  --c-shadow-light: rgba(255,255,255,0.82);

  /* Neumorphism 阴影 */
  --neu-shadow: -5px -5px 15px var(--c-shadow-light), 5px 5px 15px var(--c-shadow-dark);
  --neu-shadow-inset: inset -3px -3px 8px var(--c-shadow-light), inset 3px 3px 8px var(--c-shadow-dark);
  --neu-shadow-press: inset -2px -2px 5px var(--c-shadow-light), inset 2px 2px 5px var(--c-shadow-dark);
  --neu-shadow-sm: -3px -3px 8px var(--c-shadow-light), 3px 3px 8px var(--c-shadow-dark);

  --radius: 14px;
  --radius-sm: 10px;
  --font-mono: 'Share Tech Mono', 'Fira Code', 'Courier New', monospace;
  --font-body: 'Fira Code', 'Share Tech Mono', monospace;

  --transition: 150ms ease;
  --max-w: 1100px;
  --prose-w: 780px;
}

/* ===========================
   Reset & Base
   =========================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text);
  background-color: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a {
  color: var(--c-dark);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition), opacity var(--transition);
}

a:hover {
  opacity: 0.72;
}

ul, menu {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-mono);
  font-weight: 600;
  line-height: 1.3;
}

/* ===========================
   公告条
   =========================== */
.announce-bar {
  background: linear-gradient(145deg, var(--c-dark), #253545);
  color: var(--c-primary);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  padding: 8px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  min-height: 40px;
}

.announce-sep {
  opacity: 0.4;
}

/* ===========================
   站点头部
   =========================== */
.site-header {
  background: linear-gradient(145deg, var(--c-bg), var(--c-primary));
  padding: 16px 24px 0;
  box-shadow: 0 4px 20px var(--c-shadow-dark);
  position: relative;
  z-index: 100;
}

.brand-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 14px;
  flex-wrap: wrap;
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  box-shadow: var(--neu-shadow-sm);
}

.brand-name {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-dark);
  text-decoration: none;
}

.brand-tagline {
  font-size: 13px;
  color: var(--c-text-muted);
  letter-spacing: 0.03em;
  margin-left: auto;
}

/* ===========================
   导航 details > summary + menu > li > a
   =========================== */
.nav-details {
  border-top: 1px solid var(--c-border);
}

.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 4px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-text-muted);
  letter-spacing: 0.05em;
  list-style: none;
  min-height: 44px;
  user-select: none;
}

.nav-toggle::-webkit-details-marker {
  display: none;
}

.nav-toggle-icon {
  font-size: 20px;
  line-height: 1;
  transition: transform var(--transition);
}

.nav-details[open] .nav-toggle-icon {
  transform: rotate(90deg);
}

.nav-menu {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-bottom: 12px;
}

.nav-menu li a {
  display: block;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.03em;
  color: var(--c-dark);
  text-decoration: none;
  border-radius: var(--radius-sm);
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition);
  min-height: 40px;
  line-height: 1.4;
}

.nav-menu li a:hover {
  background: linear-gradient(145deg, var(--c-primary), var(--c-bg));
  box-shadow: var(--neu-shadow-sm);
  opacity: 1;
}

.nav-menu li a.nav-active {
  background: linear-gradient(145deg, var(--c-surface), var(--c-primary));
  box-shadow: var(--neu-shadow-inset);
  font-weight: 600;
}

/* ===========================
   粘性锚点条（指南页）
   =========================== */
.sticky-anchor-bar {
  position: sticky;
  top: 0;
  z-index: 90;
  background: linear-gradient(145deg, var(--c-surface), var(--c-bg));
  border-bottom: 1px solid var(--c-border);
  display: flex;
  gap: 4px;
  padding: 8px 20px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  box-shadow: 0 3px 12px var(--c-shadow-dark);
}

.sticky-anchor-bar::-webkit-scrollbar {
  display: none;
}

.anchor-link {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--c-text-muted);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: background var(--transition), box-shadow var(--transition);
}

.anchor-link:hover {
  background: linear-gradient(145deg, var(--c-primary), var(--c-bg));
  box-shadow: var(--neu-shadow-sm);
  opacity: 1;
}

/* ===========================
   Hero 区（首页）
   =========================== */
.hero-section {
  position: relative;
  min-height: 45vh;
  background: linear-gradient(145deg, var(--c-dark) 0%, #253545 60%, #1a2d3e 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  overflow: hidden;
}

.hero-inner {
  position: relative;
  z-index: 2;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 48px 24px 72px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 20px;
}

.hero-img {
  max-height: 180px;
  width: auto;
  border-radius: var(--radius);
  box-shadow: var(--neu-shadow);
  object-fit: cover;
}

.hero-h1 {
  font-family: var(--font-mono);
  font-size: clamp(24px, 5vw, 44px);
  color: var(--c-primary);
  letter-spacing: 0.04em;
  text-shadow: 0 2px 12px rgba(0,0,0,0.4);
}

.hero-lead {
  font-size: 16px;
  color: rgba(200,224,244,0.8);
  max-width: 560px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

/* 圆弧底边 */
.hero-arc {
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 48px;
  background: var(--c-bg);
  clip-path: ellipse(60% 100% at 50% 100%);
  z-index: 3;
}

/* ===========================
   按钮
   =========================== */
.btn-primary,
.btn-secondary {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.05em;
  padding: 12px 24px;
  border-radius: var(--radius);
  text-decoration: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  transition: box-shadow var(--transition), transform var(--transition), background var(--transition);
}

.btn-primary {
  background: linear-gradient(145deg, var(--c-primary), #a8c8e8);
  color: var(--c-dark);
  box-shadow: var(--neu-shadow);
}

.btn-primary:hover {
  box-shadow: -6px -6px 18px var(--c-shadow-light), 6px 6px 18px var(--c-shadow-dark);
  opacity: 1;
  transform: translateY(-1px);
}

.btn-primary:active {
  box-shadow: var(--neu-shadow-press);
  transform: scale(0.98);
}

.btn-secondary {
  background: linear-gradient(145deg, var(--c-accent), #e8c8d4);
  color: var(--c-dark);
  box-shadow: var(--neu-shadow);
}

.btn-secondary:hover {
  box-shadow: -6px -6px 18px var(--c-shadow-light), 6px 6px 18px var(--c-shadow-dark);
  opacity: 1;
  transform: translateY(-1px);
}

.btn-secondary:active {
  box-shadow: var(--neu-shadow-press);
  transform: scale(0.98);
}

/* ===========================
   首页主体
   =========================== */
.home-main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 48px 24px;
  display: flex;
  flex-direction: column;
  gap: 56px;
}

/* 区块 label */
.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-text-light);
  text-transform: uppercase;
  border-bottom: 1px solid var(--c-border);
  padding-bottom: 6px;
  display: block;
}

.section-label-fig {
  margin-bottom: 24px;
}

/* 正文内容 prose */
.prose-block,
.guide-prose,
.faq-prose,
.about-prose,
.privacy-prose,
.default-prose {
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-text);
  max-width: var(--prose-w);
}

.prose-block h2,
.guide-prose h2,
.faq-prose h2,
.about-prose h2,
.privacy-prose h2,
.default-prose h2 {
  font-family: var(--font-mono);
  font-size: 20px;
  margin: 2em 0 0.75em;
  color: var(--c-dark);
  letter-spacing: 0.03em;
}

.prose-block h3,
.guide-prose h3,
.faq-prose h3,
.about-prose h3,
.privacy-prose h3,
.default-prose h3 {
  font-family: var(--font-mono);
  font-size: 17px;
  margin: 1.8em 0 0.6em;
  color: var(--c-dark);
}

.prose-block p,
.guide-prose p,
.faq-prose p,
.about-prose p,
.privacy-prose p,
.default-prose p {
  margin-bottom: 1.2em;
}

.prose-block ul,
.prose-block ol,
.guide-prose ul,
.guide-prose ol,
.faq-prose ul,
.faq-prose ol,
.about-prose ul,
.about-prose ol,
.privacy-prose ul,
.privacy-prose ol,
.default-prose ul,
.default-prose ol {
  margin: 1em 0 1em 1.4em;
  list-style: disc;
}

.prose-block ol,
.guide-prose ol,
.faq-prose ol,
.about-prose ol,
.privacy-prose ol,
.default-prose ol {
  list-style: decimal;
}

.prose-block li,
.guide-prose li,
.faq-prose li,
.about-prose li,
.privacy-prose li,
.default-prose li {
  margin-bottom: 0.5em;
}

.prose-block code,
.guide-prose code,
.faq-prose code,
.about-prose code,
.privacy-prose code,
.default-prose code {
  font-family: var(--font-mono);
  font-size: 14px;
  background: linear-gradient(145deg, var(--c-surface), var(--c-primary));
  padding: 2px 6px;
  border-radius: 6px;
  box-shadow: var(--neu-shadow-sm);
}

.prose-block a,
.guide-prose a,
.faq-prose a,
.about-prose a,
.privacy-prose a,
.default-prose a {
  color: var(--c-dark);
  font-weight: 500;
}

/* HUD 数据条 */
.hud-stats {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.stat-node {
  flex: 1;
  min-width: 120px;
  background: linear-gradient(145deg, var(--c-bg), var(--c-surface));
  border-radius: var(--radius);
  box-shadow: var(--neu-shadow);
  padding: 20px 16px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat-num {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  color: var(--c-dark);
  letter-spacing: 0.04em;
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-text-muted);
  letter-spacing: 0.06em;
}

/* ===========================
   卡片 grid
   =========================== */
.guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  list-style: none;
}

.card-neu {
  background: linear-gradient(145deg, var(--c-bg), var(--c-surface));
  border-radius: var(--radius);
  box-shadow: var(--neu-shadow);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  border: none;
  transition: box-shadow var(--transition), transform var(--transition);
}

.card-neu:hover {
  box-shadow: -7px -7px 20px var(--c-shadow-light), 7px 7px 20px var(--c-shadow-dark);
  transform: translateY(-2px);
}

.card-neu h3 {
  font-size: 15px;
  letter-spacing: 0.03em;
}

.card-neu h3 a {
  color: var(--c-dark);
  text-decoration: none;
}

.card-neu h3 a:hover {
  text-decoration: underline;
  opacity: 1;
}

.card-neu p {
  font-size: 14px;
  color: var(--c-text-muted);
  line-height: 1.6;
}

.card-date {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-text-light);
  letter-spacing: 0.05em;
  margin-top: auto;
}

.section-more {
  margin-top: 24px;
  text-align: right;
}

.link-more {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--c-dark);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  background: linear-gradient(145deg, var(--c-primary), var(--c-bg));
  box-shadow: var(--neu-shadow-sm);
  display: inline-block;
  transition: box-shadow var(--transition);
  min-height: 40px;
  line-height: 24px;
}

.link-more:hover {
  box-shadow: -5px -5px 12px var(--c-shadow-light), 5px 5px 12px var(--c-shadow-dark);
  opacity: 1;
}

/* About 条 */
.about-strip {
  background: linear-gradient(145deg, var(--c-bg-alt), var(--c-accent));
  border-radius: var(--radius);
  box-shadow: var(--neu-shadow);
  padding: 20px 24px;
  font-size: 15px;
  line-height: 1.7;
}

.about-strip a {
  font-weight: 600;
}

/* ===========================
   Aside 通用
   =========================== */
.aside-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-text-light);
  display: block;
  margin-bottom: 10px;
  border-bottom: 1px solid var(--c-border);
  padding-bottom: 6px;
}

.guide-info-aside,
.faq-quick-nav,
.about-brand-aside,
.privacy-nav-aside,
.default-nav-aside {
  background: linear-gradient(145deg, var(--c-bg-alt), var(--c-surface-alt));
  border-radius: var(--radius);
  box-shadow: var(--neu-shadow);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 15px;
}

.guide-info-aside p,
.faq-quick-nav p {
  color: var(--c-text-muted);
  font-size: 14px;
  line-height: 1.6;
  margin: 0;
}

.aside-nav-links,
.guide-info-aside a,
.faq-quick-nav a,
.about-brand-aside a,
.privacy-nav-aside a,
.default-nav-aside a {
  display: block;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-dark);
  text-decoration: none;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  min-height: 40px;
  line-height: 26px;
  transition: background var(--transition), box-shadow var(--transition);
}

.aside-nav-links a:hover,
.guide-info-aside a:hover,
.faq-quick-nav a:hover,
.about-brand-aside a:hover,
.privacy-nav-aside a:hover,
.default-nav-aside a:hover {
  background: linear-gradient(145deg, var(--c-primary), var(--c-bg));
  box-shadow: var(--neu-shadow-sm);
  opacity: 1;
}

/* ===========================
   指南页
   =========================== */
.guide-hero-bar {
  background: linear-gradient(145deg, var(--c-dark), #253545);
  padding: 32px 24px 40px;
  display: flex;
  gap: 24px;
  align-items: flex-end;
  flex-wrap: wrap;
  position: relative;
}

.guide-hero-img {
  width: 120px;
  height: 80px;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: var(--neu-shadow);
  flex-shrink: 0;
}

.guide-hero-meta {
  flex: 1;
  min-width: 200px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.guide-eyebrow,
.faq-eyebrow,
.about-eyebrow,
.privacy-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-accent);
}

.guide-h1 {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.5vw, 32px);
  color: var(--c-primary);
  letter-spacing: 0.03em;
  line-height: 1.3;
}

.guide-dates {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.article-date {
  font-family: var(--font-mono);
  font-size: 13px;
  color: rgba(200,224,244,0.7);
  letter-spacing: 0.04em;
}

.guide-main,
.faq-main,
.about-main,
.privacy-main,
.default-main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 40px 24px 56px;
  display: flex;
  flex-direction: column;
  gap: 48px;
}

.guide-content-section,
.faq-content-section,
.about-content-section,
.privacy-content-section,
.default-content-section {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 32px;
  align-items: start;
}

.content-lead-fig,
.faq-nav-fig,
.about-brand-fig,
.privacy-nav-fig,
.default-nav-fig {
  position: sticky;
  top: 60px;
}

/* Related section */
.related-section {
  padding-top: 24px;
  border-top: 1px solid var(--c-border);
}

.related-aside {
  margin-top: 16px;
}

.related-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  list-style: none;
}

.related-list li a {
  display: block;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--c-dark);
  text-decoration: none;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: linear-gradient(145deg, var(--c-bg), var(--c-surface));
  box-shadow: var(--neu-shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
  min-height: 40px;
  line-height: 20px;
}

.related-list li a:hover {
  box-shadow: -4px -4px 12px var(--c-shadow-light), 4px 4px 12px var(--c-shadow-dark);
  transform: translateX(3px);
  opacity: 1;
}

/* ===========================
   FAQ 页
   =========================== */
.faq-page-header {
  background: linear-gradient(145deg, var(--c-dark), #1e3040);
  padding: 32px 24px 44px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.faq-h1 {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.5vw, 32px);
  color: var(--c-primary);
  letter-spacing: 0.03em;
}

.faq-lead {
  font-size: 15px;
  color: rgba(200,224,244,0.8);
  max-width: 560px;
}

.faq-guides-section,
.about-guides-section {
  padding-top: 24px;
  border-top: 1px solid var(--c-border);
}

.faq-guide-list,
.about-guide-list {
  margin-top: 16px;
}

.faq-guide-list li article,
.about-guide-list li article {
  background: linear-gradient(145deg, var(--c-bg), var(--c-surface));
  border-radius: var(--radius);
  box-shadow: var(--neu-shadow);
  padding: 16px;
  transition: box-shadow var(--transition);
}

.faq-guide-list li article:hover,
.about-guide-list li article:hover {
  box-shadow: -6px -6px 16px var(--c-shadow-light), 6px 6px 16px var(--c-shadow-dark);
}

.faq-guide-list li article h3,
.about-guide-list li article h3 {
  font-size: 15px;
  margin-bottom: 6px;
}

.faq-guide-list li article h3 a,
.about-guide-list li article h3 a {
  color: var(--c-dark);
  text-decoration: none;
}

.faq-guide-list li article h3 a:hover,
.about-guide-list li article h3 a:hover {
  text-decoration: underline;
}

.faq-guide-list li article p,
.about-guide-list li article p {
  font-size: 13px;
  color: var(--c-text-muted);
  line-height: 1.6;
  margin: 0;
}

/* ===========================
   About 页
   =========================== */
.about-page-header {
  background: linear-gradient(145deg, #1e2c3a, var(--c-dark));
  padding: 32px 24px 44px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.about-h1 {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.5vw, 32px);
  color: var(--c-primary);
  letter-spacing: 0.03em;
}

.about-lead {
  font-size: 15px;
  color: rgba(200,224,244,0.8);
  max-width: 560px;
}

/* ===========================
   Privacy 页
   =========================== */
.privacy-page-header {
  background: linear-gradient(145deg, var(--c-dark), #212d3a);
  padding: 28px 24px 40px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.privacy-h1 {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.5vw, 30px);
  color: var(--c-primary);
  letter-spacing: 0.03em;
}

/* ===========================
   Default 页
   =========================== */
.default-page-header {
  background: linear-gradient(145deg, var(--c-dark), #253545);
  padding: 28px 24px 40px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.default-h1 {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.5vw, 30px);
  color: var(--c-primary);
  letter-spacing: 0.03em;
}

.default-lead {
  font-size: 15px;
  color: rgba(200,224,244,0.8);
}

/* ===========================
   页脚
   =========================== */
.site-footer {
  background: linear-gradient(145deg, var(--c-dark), #1a2634);
  padding: 32px 24px 20px;
  margin-top: 40px;
}

.footer-brand-row {
  text-align: center;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(200,224,244,0.1);
  margin-bottom: 16px;
}

.footer-brand-big {
  font-family: var(--font-mono);
  font-size: clamp(36px, 8vw, 72px);
  font-weight: 700;
  color: rgba(200,224,244,0.12);
  letter-spacing: 0.1em;
  user-select: none;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 13px;
  color: rgba(200,224,244,0.5);
  letter-spacing: 0.04em;
}

.footer-links {
  display: flex;
  gap: 16px;
}

.footer-links a {
  font-family: var(--font-mono);
  font-size: 13px;
  color: rgba(200,224,244,0.6);
  text-decoration: none;
  padding: 8px 4px;
  min-height: 40px;
  display: flex;
  align-items: center;
  letter-spacing: 0.04em;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--c-primary);
  opacity: 1;
}

/* ===========================
   时间标记
   =========================== */
time.article-date {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
}

/* ===========================
   响应式
   =========================== */
@media (min-width: 768px) {
  .nav-details {
    border-top: none;
  }

  .nav-toggle {
    display: none;
  }

  .nav-details[open] .nav-menu,
  .nav-menu {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 4px;
    padding-bottom: 10px;
    padding-top: 0;
  }

  .nav-menu li a {
    font-size: 13px;
    padding: 8px 12px;
  }

  /* details always open on desktop */
  .nav-details {
    open: true;
  }
}

@media (max-width: 767px) {
  .guide-content-section,
  .faq-content-section,
  .about-content-section,
  .privacy-content-section,
  .default-content-section {
    grid-template-columns: 1fr;
  }

  .content-lead-fig,
  .faq-nav-fig,
  .about-brand-fig,
  .privacy-nav-fig,
  .default-nav-fig {
    position: static;
  }

  .guide-grid {
    grid-template-columns: 1fr;
  }

  .hud-stats {
    gap: 14px;
  }

  .stat-node {
    min-width: 80px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .brand-tagline {
    display: none;
  }

  .guide-dates {
    flex-direction: column;
    gap: 4px;
  }
}

@media (max-width: 480px) {
  .site-header {
    padding: 12px 16px 0;
  }

  .home-main,
  .guide-main,
  .faq-main,
  .about-main,
  .privacy-main,
  .default-main {
    padding: 28px 16px 40px;
  }

  .hero-inner {
    padding: 36px 16px 64px;
  }

  .guide-hero-bar,
  .faq-page-header,
  .about-page-header,
  .privacy-page-header,
  .default-page-header {
    padding: 24px 16px 32px;
  }

  .sticky-anchor-bar {
    padding: 6px 12px;
  }

  .stat-num {
    font-size: 26px;
  }
}

/* ===========================
   prefers-reduced-motion
   =========================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}

/* ===========================
   details open 状态（桌面始终展开导航）
   =========================== */
@media (min-width: 768px) {
  .nav-details {
    display: contents;
  }

  .nav-details .nav-menu {
    display: flex !important;
  }

  .nav-toggle {
    display: none !important;
  }
}