@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700;800&display=swap');

/* =============================================
   CSS 自定义属性
   ============================================= */
:root {
  --c-mint: #b4fde1;
  --c-blue: #add8e6;
  --c-dark: #172620;
  --c-dark2: #1e3028;
  --c-dark3: #243b30;
  --c-mint-dim: rgba(180,253,225,0.12);
  --c-blue-dim: rgba(173,216,230,0.12);
  --c-text: #e8f5ef;
  --c-text-muted: #8fb8a0;
  --c-border-mint: #b4fde1;
  --c-border-blue: #add8e6;

  --radius-card: 18px;
  --radius-btn: 14px;
  --radius-hero: 24px;

  --shadow-outer: 4px 4px 10px rgba(0,0,0,0.45);
  --shadow-inner: inset -2px -2px 8px rgba(180,253,225,0.08);
  --shadow-card: 4px 4px 12px rgba(0,0,0,0.4), inset -2px -2px 6px rgba(180,253,225,0.06);

  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --nav-h: 64px;
  --anchor-h: 44px;

  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* =============================================
   重置与基础
   ============================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 17px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background-color: var(--c-dark);
  color: var(--c-text);
  line-height: 1.65;
  overflow-x: hidden;
  min-height: 100vh;
}

a {
  color: var(--c-mint);
  text-decoration: none;
  transition: color 0.2s ease-out, opacity 0.2s ease-out;
}

a:hover {
  color: var(--c-blue);
  opacity: 0.9;
}

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

ul {
  list-style: none;
}

/* =============================================
   导航 Header
   ============================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(23,38,32,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 3px solid var(--c-mint);
  height: var(--nav-h);
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 3px solid var(--c-mint);
  background: var(--c-mint-dim);
  box-shadow: var(--shadow-outer), var(--shadow-inner);
  transition: transform 0.2s var(--ease-bounce);
}

.brand-icon:hover {
  transform: scale(1.08);
}

.brand-glyph {
  font-size: 15px;
  font-weight: 800;
  color: var(--c-mint);
  letter-spacing: -0.5px;
}

.logo-img {
  border-radius: 8px;
}

.main-nav {
  flex: 1;
  overflow: hidden;
}

.nav-links {
  display: flex;
  flex-wrap: nowrap;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  align-items: center;
}

.nav-links::-webkit-scrollbar {
  display: none;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--c-text);
  border-radius: 10px;
  white-space: nowrap;
  min-height: 40px;
  border: 2px solid transparent;
  transition: all 0.2s var(--ease-out);
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--c-mint);
  background: var(--c-mint-dim);
  border-color: var(--c-mint);
}

/* 汉堡按钮 */
.burger-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: var(--c-mint-dim);
  border: 3px solid var(--c-mint);
  border-radius: 12px;
  cursor: pointer;
  padding: 8px 10px;
  flex-shrink: 0;
  transition: transform 0.2s var(--ease-bounce), background 0.2s;
}

.burger-btn:hover {
  background: rgba(180,253,225,0.2);
  transform: scale(1.05);
}

.burger-btn span {
  display: block;
  width: 100%;
  height: 2.5px;
  background: var(--c-mint);
  border-radius: 2px;
  transition: all 0.25s ease-out;
}

.burger-btn[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

.burger-btn[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.burger-btn[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

/* =============================================
   全屏菜单遮罩
   ============================================= */
.fullscreen-menu {
  position: fixed;
  inset: 0;
  z-index: 300;
  background: rgba(23,38,32,0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease-out;
}

.fullscreen-menu.is-open {
  opacity: 1;
  pointer-events: auto;
}

.menu-close {
  position: absolute;
  top: 20px;
  right: 24px;
  width: 48px;
  height: 48px;
  background: var(--c-mint-dim);
  border: 3px solid var(--c-mint);
  border-radius: 14px;
  color: var(--c-mint);
  font-size: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s var(--ease-bounce);
}

.menu-close:hover {
  transform: scale(1.1) rotate(90deg);
}

.menu-nav {
  text-align: center;
}

.menu-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}

.menu-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 18px;
  font-weight: 700;
  color: var(--c-text);
  border-radius: 16px;
  border: 3px solid transparent;
  min-height: 52px;
  min-width: 280px;
  text-align: center;
  transition: all 0.2s var(--ease-bounce);
  background: rgba(255,255,255,0.03);
}

.menu-links a:hover {
  color: var(--c-dark);
  background: var(--c-mint);
  border-color: var(--c-mint);
  transform: scale(1.03);
}

/* =============================================
   粘性锚点条
   ============================================= */
.sticky-anchor {
  position: sticky;
  top: var(--nav-h);
  z-index: 150;
  background: var(--c-dark2);
  border-bottom: 2px solid var(--c-dark3);
  height: var(--anchor-h);
  overflow: hidden;
}

.anchor-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.anchor-link {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--c-text-muted);
  border-radius: 8px;
  white-space: nowrap;
  min-height: 30px;
  transition: all 0.2s ease-out;
}

.anchor-link:hover,
.anchor-link.active {
  color: var(--c-mint);
  background: var(--c-mint-dim);
}

/* =============================================
   主容器布局
   ============================================= */
main {
  min-height: calc(100vh - var(--nav-h) - 120px);
}

.wrap {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* =============================================
   Hero 区域
   ============================================= */
.page-hero-section {
  padding: 0;
  margin-bottom: 48px;
}

.hero-article {
  position: relative;
  overflow: hidden;
  background: var(--c-dark2);
  border: 4px solid var(--c-mint);
  border-radius: var(--radius-hero);
  box-shadow: var(--shadow-card);
  margin-top: 32px;
}

/* 首页大 Hero */
.page-home .hero-article {
  min-height: 45vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 紧凑 Hero（内页） */
.compact-hero {
  padding: 40px 48px;
}

/* 点阵底纹 */
.hero-dot-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle, rgba(180,253,225,0.18) 1px, transparent 1px);
  background-size: 24px 24px;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  padding: 48px 32px;
}

.compact-hero .hero-content {
  padding: 0;
  text-align: left;
  max-width: none;
  margin: 0;
}

.eyebrow-tag {
  display: inline-block;
  padding: 4px 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--c-mint-dim);
  border: 2px solid var(--c-mint);
  border-radius: 8px;
  color: var(--c-mint);
  margin-bottom: 16px;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--c-mint);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.compact-hero h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  color: var(--c-text);
}

.subtitle,
p.subtitle {
  font-size: 1.05rem;
  color: var(--c-text-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--c-text);
  max-width: 600px;
  margin: 0 auto 28px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 24px;
}

/* 日期行 */
.date-row {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.pub-date,
.mod-date {
  font-size: 13px;
  color: var(--c-text-muted);
  font-weight: 600;
}

/* =============================================
   按钮
   ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 700;
  border-radius: var(--radius-btn);
  border: 3px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.2s var(--ease-bounce), box-shadow 0.2s ease-out, background 0.2s;
  min-height: 48px;
  line-height: 1.2;
}

.btn:active {
  transform: scale(0.96);
}

.btn-primary {
  background: var(--c-mint);
  color: var(--c-dark);
  border-color: var(--c-mint);
  box-shadow: 3px 3px 10px rgba(180,253,225,0.3), inset -1px -1px 4px rgba(0,0,0,0.1);
}

.btn-primary:hover {
  background: #c8ffe9;
  border-color: #c8ffe9;
  color: var(--c-dark);
  transform: translateY(-2px) scale(1.02);
  box-shadow: 4px 6px 16px rgba(180,253,225,0.4), inset -1px -1px 4px rgba(0,0,0,0.1);
}

.btn-secondary {
  background: var(--c-blue-dim);
  color: var(--c-blue);
  border-color: var(--c-blue);
  box-shadow: 3px 3px 10px rgba(173,216,230,0.2), var(--shadow-inner);
}

.btn-secondary:hover {
  background: rgba(173,216,230,0.2);
  transform: translateY(-2px) scale(1.02);
  color: var(--c-blue);
}

.btn-outline {
  background: transparent;
  color: var(--c-mint);
  border-color: var(--c-mint);
}

.btn-outline:hover {
  background: var(--c-mint-dim);
  transform: translateY(-2px);
  color: var(--c-mint);
}

.btn-lg {
  padding: 16px 40px;
  font-size: 17px;
  border-radius: 18px;
  min-height: 56px;
}

/* =============================================
   内容区（prose-article：aside 左侧）
   ============================================= */
.content-section {
  margin-bottom: 48px;
}

.prose-article {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 32px;
  align-items: start;
}

/* aside 在左 */
.page-aside {
  position: sticky;
  top: calc(var(--nav-h) + 16px);
  background: var(--c-dark2);
  border: 3px solid var(--c-mint);
  border-radius: var(--radius-card);
  padding: 24px 20px;
  box-shadow: var(--shadow-card);
}

.page-aside h2 {
  font-size: 14px;
  font-weight: 800;
  color: var(--c-mint);
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}

.page-aside .subtitle {
  font-size: 12px;
  margin-bottom: 16px;
  color: var(--c-text-muted);
}

.aside-link {
  display: block;
  padding: 9px 12px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--c-text);
  border-radius: 10px;
  border: 2px solid transparent;
  transition: all 0.18s ease-out;
  margin-bottom: 4px;
  min-height: 40px;
  line-height: 1.3;
  display: flex;
  align-items: center;
}

.aside-link:hover {
  color: var(--c-mint);
  background: var(--c-mint-dim);
  border-color: var(--c-mint);
}

/* 正文排版 */
.prose-body {
  min-width: 0;
}

.prose-body h2 {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--c-mint);
  margin: 36px 0 8px;
  line-height: 1.25;
}

.prose-body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--c-blue);
  margin: 24px 0 8px;
}

.prose-body p {
  margin-bottom: 18px;
  color: var(--c-text);
  font-size: 1rem;
  line-height: 1.75;
}

.prose-body ul,
.prose-body ol {
  margin: 16px 0 20px 20px;
  list-style: disc;
}

.prose-body ol {
  list-style: decimal;
}

.prose-body li {
  margin-bottom: 8px;
  line-height: 1.65;
}

.prose-body a {
  color: var(--c-mint);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose-body blockquote {
  border-left: 4px solid var(--c-mint);
  padding: 12px 20px;
  background: var(--c-mint-dim);
  border-radius: 0 12px 12px 0;
  margin: 20px 0;
  color: var(--c-text);
  font-style: italic;
}

.prose-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 14.5px;
}

.prose-body th,
.prose-body td {
  padding: 10px 14px;
  border: 2px solid var(--c-dark3);
  text-align: left;
}

.prose-body th {
  background: var(--c-mint-dim);
  color: var(--c-mint);
  font-weight: 700;
}

/* =============================================
   卡片网格
   ============================================= */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.card-grid-2 {
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

.card-grid-3 {
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}

.card-item {
  list-style: none;
}

.card-item > article {
  background: var(--c-dark2);
  border: 3px solid var(--c-blue);
  border-radius: var(--radius-card);
  padding: 24px 22px;
  box-shadow: var(--shadow-card);
  height: 100%;
  transition: transform 0.2s var(--ease-bounce), box-shadow 0.2s ease-out, border-color 0.2s;
}

.card-item > article:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: 6px 8px 20px rgba(0,0,0,0.5), inset -2px -2px 8px rgba(180,253,225,0.08);
  border-color: var(--c-mint);
}

.card-item h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 10px;
  line-height: 1.35;
}

.card-item h3 a {
  color: var(--c-text);
}

.card-item h3 a:hover {
  color: var(--c-mint);
}

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

.card-link {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--c-mint);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* =============================================
   功能/特性 区块
   ============================================= */
.features-section,
.related-section,
.cta-section,
.contact-info-section,
.stats-section {
  margin-bottom: 56px;
}

.features-section h2,
.related-section h2,
.cta-section h2,
.contact-info-section h2,
.stats-section h2 {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--c-mint);
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.features-section > .subtitle,
.related-section > .subtitle,
.cta-section > .subtitle,
.contact-info-section > .subtitle,
.stats-section > .subtitle {
  margin-bottom: 28px;
  font-size: 1rem;
}

.cta-btn-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 24px;
}

/* 统计网格 */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
  list-style: none;
  padding: 0;
}

.stat-card {
  list-style: none;
}

.stat-card > article {
  background: var(--c-dark2);
  border: 3px solid var(--c-mint);
  border-radius: var(--radius-card);
  padding: 24px 20px;
  box-shadow: var(--shadow-card);
  text-align: center;
  transition: transform 0.2s var(--ease-bounce);
}

.stat-card > article:hover {
  transform: translateY(-3px);
}

.stat-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--c-mint);
  margin-bottom: 8px;
  line-height: 1.1;
}

.stat-card p {
  font-size: 14px;
  color: var(--c-text-muted);
}

/* =============================================
   页脚
   ============================================= */
.site-footer {
  background: var(--c-dark2);
  border-top: 3px solid var(--c-dark3);
  padding: 40px 24px 24px;
  text-align: center;
}

.footer-cta {
  margin-bottom: 20px;
}

.site-footer small {
  display: block;
  font-size: 13px;
  color: var(--c-text-muted);
  line-height: 1.7;
}

.site-footer small a {
  color: var(--c-text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.site-footer small a:hover {
  color: var(--c-mint);
}

/* =============================================
   Scroll Reveal 动效
   ============================================= */
@media (prefers-reduced-motion: no-preference) {
  .reveal-item {
    opacity: 0;
    transform: translateY(24px) scale(0.97);
    transition:
      opacity 0.5s var(--ease-out),
      transform 0.5s var(--ease-bounce);
    transition-delay: calc(var(--i, 0) * 0.08s);
  }

  .reveal-item.is-visible {
    opacity: 1;
    transform: translateY(0) scale(1);
  }

  .prose-article,
  .page-hero-section,
  .features-section,
  .related-section,
  .contact-info-section,
  .stats-section,
  .cta-section {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
  }

  .prose-article.is-visible,
  .page-hero-section.is-visible,
  .features-section.is-visible,
  .related-section.is-visible,
  .contact-info-section.is-visible,
  .stats-section.is-visible,
  .cta-section.is-visible {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .reveal-item,
  .prose-article,
  .page-hero-section,
  .features-section,
  .related-section,
  .contact-info-section,
  .stats-section,
  .cta-section {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* =============================================
   移动端响应式
   ============================================= */
@media (max-width: 900px) {
  .prose-article {
    grid-template-columns: 1fr;
  }

  .page-aside {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px;
  }

  .page-aside h2,
  .page-aside .subtitle {
    grid-column: 1 / -1;
  }

  .anchor-inner {
    gap: 2px;
  }
}

@media (max-width: 640px) {
  html {
    font-size: 16px;
  }

  :root {
    --nav-h: 60px;
  }

  .header-inner {
    padding: 0 16px;
    gap: 10px;
  }

  .main-nav {
    display: none;
  }

  .wrap {
    padding: 0 16px;
  }

  .hero-content {
    padding: 36px 20px;
  }

  .compact-hero {
    padding: 28px 20px;
  }

  .compact-hero .hero-content {
    padding: 0;
  }

  h1 {
    font-size: clamp(1.5rem, 7vw, 2.2rem);
  }

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

  .btn {
    min-height: 48px;
    padding: 12px 22px;
  }

  .card-grid,
  .card-grid-2,
  .card-grid-3 {
    grid-template-columns: 1fr;
  }

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

  .page-aside {
    grid-template-columns: 1fr;
  }

  .menu-links a {
    min-width: 88vw;
    font-size: 16px;
    padding: 12px 20px;
  }

  .features-section h2,
  .related-section h2,
  .cta-section h2,
  .stats-section h2,
  .contact-info-section h2 {
    font-size: 1.4rem;
  }

  .cta-btn-row {
    flex-direction: column;
  }

  .site-footer {
    padding: 32px 16px 20px;
  }
}

@media (max-width: 375px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .stat-num {
    font-size: 1.6rem;
  }
}

/* =============================================
   FAQ 特定样式
   ============================================= */
.faq-body h2 {
  margin-top: 32px;
}

.faq-body details {
  border: 3px solid var(--c-dark3);
  border-radius: 14px;
  margin-bottom: 12px;
  padding: 0;
  overflow: hidden;
  transition: border-color 0.2s;
}

.faq-body details[open] {
  border-color: var(--c-mint);
}

.faq-body summary {
  padding: 16px 20px;
  font-weight: 700;
  font-size: 1rem;
  color: var(--c-text);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 56px;
  user-select: none;
}

.faq-body summary::-webkit-details-marker {
  display: none;
}

.faq-body summary::after {
  content: '+';
  font-size: 22px;
  color: var(--c-mint);
  font-weight: 400;
  transition: transform 0.2s ease-out;
  flex-shrink: 0;
  margin-left: 12px;
}

.faq-body details[open] summary::after {
  transform: rotate(45deg);
}

.faq-body details > div,
.faq-body details > p {
  padding: 0 20px 18px;
  color: var(--c-text-muted);
  font-size: 15px;
  line-height: 1.7;
}

/* =============================================
   Privacy 特定样式
   ============================================= */
.privacy-prose h2 {
  margin-top: 40px;
  font-size: 1.3rem;
}

.privacy-prose h3 {
  font-size: 1.05rem;
  margin-top: 20px;
}