@import url('https://fonts.googleapis.com/css2?family=Libre+Bodoni:wght@400;500;600;700&family=Public+Sans:wght@300;400;500;600;700&display=swap');

/* ===== 变量 ===== */
:root {
  --c-blue: #c8e0f4;
  --c-pink: #f5e0e8;
  --c-dark: #171f26;
  --c-blue-light: #ddeefa;
  --c-blue-dark: #a8c8e8;
  --c-pink-light: #faeef3;
  --c-pink-dark: #e8c8d8;
  --c-text: #1e2a35;
  --c-text-muted: #5a6a7a;
  --c-surface: #d4e6f5;
  --shadow-out: -5px -5px 15px rgba(255,255,255,0.75), 5px 5px 15px rgba(30,50,70,0.18);
  --shadow-in: inset -3px -3px 8px rgba(255,255,255,0.7), inset 3px 3px 8px rgba(30,50,70,0.15);
  --shadow-card: -4px -4px 12px rgba(255,255,255,0.8), 4px 4px 12px rgba(30,50,70,0.15);
  --shadow-hover: -6px -6px 18px rgba(255,255,255,0.85), 6px 6px 18px rgba(30,50,70,0.22);
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 28px;
  --font-head: 'Libre Bodoni', Georgia, serif;
  --font-body: 'Public Sans', system-ui, sans-serif;
  --nav-h: 64px;
  --sticky-h: 44px;
  --transition: 150ms ease;
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font-body); background: var(--c-blue); color: var(--c-text); line-height: 1.6; min-height: 100vh; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, menu { list-style: none; }
address { font-style: normal; }
summary { list-style: none; }
summary::-webkit-details-marker { display: none; }

/* ===== 滚动偏移（粘性导航） ===== */
article[id] { scroll-margin-top: calc(var(--nav-h) + var(--sticky-h) + 12px); }

/* ===== 站点包裹 ===== */
.site-wrapper { display: flex; flex-direction: column; min-height: 100vh; }

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  height: var(--nav-h);
  background: linear-gradient(145deg, var(--c-blue-light), var(--c-blue));
  box-shadow: var(--shadow-out);
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand-area { display: flex; align-items: baseline; gap: 12px; flex-shrink: 0; }
.brand-logo {
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-dark);
  letter-spacing: -0.02em;
  line-height: 1;
}
.brand-tagline {
  font-size: 0.75rem;
  color: var(--c-text-muted);
  display: none;
}
@media (min-width: 768px) { .brand-tagline { display: inline; } }

/* details/summary 导航 */
.nav-details { position: relative; }
.nav-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  background: linear-gradient(145deg, var(--c-blue-light), var(--c-blue));
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition);
  min-height: 40px;
  user-select: none;
}
.nav-toggle:active { box-shadow: var(--shadow-in); }
.nav-toggle-icon { display: flex; flex-direction: column; gap: 4px; width: 20px; }
.nav-toggle-icon span { display: block; height: 2px; background: var(--c-dark); border-radius: 2px; transition: var(--transition); }
.nav-toggle-text { font-size: 0.875rem; font-weight: 500; color: var(--c-dark); }

.nav-details[open] .nav-toggle { box-shadow: var(--shadow-in); }
.nav-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 200px;
  background: linear-gradient(145deg, var(--c-blue-light), var(--c-blue));
  box-shadow: var(--shadow-hover);
  border-radius: var(--radius-md);
  padding: 8px;
  z-index: 300;
}
.nav-menu li { margin: 0; }
.nav-link {
  display: block;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--c-dark);
  transition: background var(--transition), box-shadow var(--transition);
  min-height: 40px;
  display: flex;
  align-items: center;
}
.nav-link:hover {
  background: linear-gradient(145deg, var(--c-blue), var(--c-blue-dark));
  box-shadow: var(--shadow-in);
}

/* 桌面展开式导航 */
@media (min-width: 960px) {
  .nav-toggle { display: none; }
  .nav-details { position: static; }
  .nav-details[open] > .nav-menu,
  .nav-menu {
    position: static;
    display: flex !important;
    flex-direction: row;
    align-items: center;
    box-shadow: none;
    background: transparent;
    padding: 0;
    gap: 4px;
  }
  .nav-details { display: flex; align-items: center; }
  /* 强制展开 */
  .nav-details:not([open]) > .nav-menu { display: flex !important; }
}

/* ===== 粘性锚点条 ===== */
.sticky-nav {
  position: sticky;
  top: var(--nav-h);
  z-index: 150;
  height: var(--sticky-h);
  background: linear-gradient(90deg, var(--c-pink-light), var(--c-pink));
  box-shadow: 0 3px 10px rgba(30,50,70,0.12);
  overflow: hidden;
}
.sticky-nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 16px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}
.sticky-nav-inner::-webkit-scrollbar { display: none; }
.sticky-link {
  flex-shrink: 0;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--c-dark);
  white-space: nowrap;
  min-height: 32px;
  display: flex;
  align-items: center;
  transition: background var(--transition), box-shadow var(--transition);
}
.sticky-link:hover {
  background: linear-gradient(145deg, var(--c-pink), var(--c-pink-dark));
  box-shadow: var(--shadow-in);
}

/* ===== 主体 ===== */
.site-main { flex: 1; }
.main-article { width: 100%; }

/* ===== Hero ===== */
.hero-block {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, var(--c-blue) 0%, var(--c-blue-light) 50%, var(--c-pink-light) 100%);
}
.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(23,31,38,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23,31,38,0.06) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}
.hero-layout {
  position: relative;
  z-index: 1;
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 24px 60px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
  width: 100%;
}
@media (min-width: 768px) {
  .hero-layout {
    grid-template-columns: 1fr 1fr;
    gap: 64px;
  }
}
.hero-media {
  order: 2;
  display: flex;
  align-items: center;
  justify-content: center;
}
@media (min-width: 768px) { .hero-media { order: 1; } }
.hero-img {
  width: 100%;
  max-width: 520px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-hover);
  object-fit: cover;
}
.hero-img-placeholder {
  width: 100%;
  max-width: 520px;
  aspect-ratio: 4/3;
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, var(--c-blue-light), var(--c-blue-dark));
  box-shadow: var(--shadow-card);
}
.hero-text {
  order: 1;
  text-align: right;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 20px;
}
@media (min-width: 768px) { .hero-text { order: 2; } }
.hero-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--c-text-muted);
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  background: linear-gradient(145deg, var(--c-pink-light), var(--c-pink));
  box-shadow: var(--shadow-card);
}
.hero-h1 {
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3.8rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--c-dark);
  letter-spacing: -0.02em;
}
.hero-sub {
  font-size: 1rem;
  color: var(--c-text-muted);
  max-width: 420px;
  line-height: 1.7;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; justify-content: flex-end; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  min-height: 44px;
  transition: box-shadow var(--transition), transform var(--transition);
}
.btn-primary {
  background: linear-gradient(145deg, var(--c-pink-light), var(--c-pink));
  color: var(--c-dark);
  box-shadow: var(--shadow-card);
}
.btn-primary:hover { box-shadow: var(--shadow-hover); }
.btn-primary:active { box-shadow: var(--shadow-in); transform: scale(0.98); }
.btn-secondary {
  background: linear-gradient(145deg, var(--c-blue-light), var(--c-blue));
  color: var(--c-dark);
  box-shadow: var(--shadow-card);
}
.btn-secondary:hover { box-shadow: var(--shadow-hover); }
.btn-secondary:active { box-shadow: var(--shadow-in); transform: scale(0.98); }

/* ===== 正文区域 ===== */
.content-section {
  padding: 60px 0;
  background: linear-gradient(180deg, var(--c-blue) 0%, var(--c-blue-light) 100%);
}
.content-with-aside {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}
@media (min-width: 1024px) {
  .content-with-aside {
    grid-template-columns: 1fr 300px;
    align-items: start;
  }
}
.content-main { min-width: 0; }

/* 正文内容样式 */
.content-main h2 {
  font-family: var(--font-head);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--c-dark);
  margin: 48px 0 8px;
  line-height: 1.25;
}
.content-main h2:first-child { margin-top: 0; }
.content-main h3 {
  font-family: var(--font-head);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--c-dark);
  margin: 32px 0 8px;
}
.content-main hr {
  border: none;
  height: 2px;
  background: linear-gradient(90deg, var(--c-pink-dark), transparent);
  margin: 0 0 24px;
  border-radius: 2px;
}
.content-main p {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--c-text);
  margin: 0 0 16px;
}
.content-main ul, .content-main ol {
  margin: 0 0 16px 20px;
  line-height: 1.75;
}
.content-main li { margin-bottom: 6px; font-size: 1rem; }
.content-main a { color: var(--c-dark); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.content-main a:hover { color: var(--c-text-muted); }
.content-main article {
  padding: 40px;
  margin: 0 0 32px;
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, var(--c-blue-light), var(--c-blue));
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition);
}
.content-main article:hover { box-shadow: var(--shadow-hover); }
.content-main strong { font-weight: 600; }
.content-main blockquote {
  margin: 24px 0;
  padding: 20px 24px;
  border-radius: var(--radius-sm);
  background: linear-gradient(145deg, var(--c-pink-light), var(--c-pink));
  box-shadow: var(--shadow-in);
  font-style: italic;
  color: var(--c-text-muted);
}

/* ===== 侧边栏 ===== */
.content-aside {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: sticky;
  top: calc(var(--nav-h) + var(--sticky-h) + 20px);
}
.aside-card {
  padding: 28px;
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, var(--c-pink-light), var(--c-pink));
  box-shadow: var(--shadow-card);
}
.aside-card.aside-info {
  background: linear-gradient(145deg, var(--c-blue-light), var(--c-blue));
}
.aside-title {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-dark);
  margin-bottom: 8px;
}
.aside-card hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, var(--c-pink-dark), transparent);
  margin: 0 0 16px;
}
.aside-card.aside-info hr {
  background: linear-gradient(90deg, var(--c-blue-dark), transparent);
}
.aside-nav-list { display: flex; flex-direction: column; gap: 4px; }
.aside-link {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--c-dark);
  min-height: 40px;
  transition: background var(--transition), box-shadow var(--transition);
  background: transparent;
}
.aside-link:hover {
  background: linear-gradient(145deg, var(--c-pink), var(--c-pink-dark));
  box-shadow: var(--shadow-in);
}
.aside-text { font-size: 0.875rem; color: var(--c-text-muted); line-height: 1.6; }

/* ===== 页脚 ===== */
.site-footer {
  background: linear-gradient(145deg, var(--c-dark) 0%, #0f161c 100%);
  color: #c8d8e8;
  padding: 64px 24px 0;
}
.footer-top {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  padding-bottom: 48px;
}
@media (min-width: 640px) { .footer-top { grid-template-columns: 1fr 1fr; } }
@media (min-width: 960px) { .footer-top { grid-template-columns: 2fr 1fr 1fr; } }
.footer-brand-name {
  font-family: var(--font-head);
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 700;
  color: var(--c-blue);
  line-height: 1;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}
.footer-brand-desc { font-size: 0.875rem; color: #7a9ab8; line-height: 1.6; max-width: 300px; }
.footer-col-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--c-pink);
  margin-bottom: 16px;
  text-transform: uppercase;
}
.footer-nav-col ul, .footer-extra-links { display: flex; flex-direction: column; gap: 6px; }
.footer-link {
  font-size: 0.875rem;
  color: #8ab0cc;
  padding: 4px 0;
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: color var(--transition);
}
.footer-link:hover { color: var(--c-blue-light); }
.footer-link-muted { font-size: 0.875rem; color: #5a7a90; }
.footer-address { margin-bottom: 16px; }
.footer-bottom {
  max-width: 1280px;
  margin: 0 auto;
  padding: 20px 0;
  border-top: 1px solid rgba(200,224,244,0.12);
}
.footer-copy { font-size: 0.8rem; color: #4a6a80; }

/* ===== 标题装饰 HR（全局备用） ===== */
h2 + hr, h3 + hr {
  border: none;
  height: 2px;
  background: linear-gradient(90deg, var(--c-pink-dark), transparent);
  margin: 0 0 24px;
  border-radius: 2px;
}

/* ===== 动效 ===== */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.55s ease, transform 0.55s ease;
  }
  .reveal.visible { opacity: 1; transform: none; }
  .stagger > * {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
  }
  .stagger > *.visible { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  .reveal, .stagger > * { opacity: 1 !important; transform: none !important; transition: none !important; }
}

/* ===== 移动端收尾 ===== */
@media (max-width: 767px) {
  .hero-text { text-align: center; align-items: center; }
  .hero-actions { justify-content: center; }
  .hero-eyebrow { align-self: center; }
  .content-main article { padding: 24px 20px; }
  .aside-card { padding: 20px; }
  .footer-brand-name { font-size: 2.5rem; }
}
@media (max-width: 374px) {
  .header-inner { padding: 0 12px; }
  .brand-logo { font-size: 1.2rem; }
}

/* ===== 无横向滚动 ===== */
html, body { overflow-x: hidden; }

/* ===== 玻璃拟态卡片补充（如需） ===== */
.glass-card {
  background: rgba(200,224,244,0.35);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255,255,255,0.4);
  box-shadow: var(--shadow-card);
}

button[aria-expanded]{min-width:44px;min-height:44px}