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

/* ===== 变量 ===== */
:root {
  --blue: #c8e0f4;
  --pink: #f5e0e8;
  --dark: #171f26;
  --blue-deep: #a2c4e0;
  --pink-deep: #e8c0d0;
  --dark-mid: #2a3540;
  --dark-light: #3d4f5e;
  --white: #ffffff;
  --text-main: #171f26;
  --text-soft: #4a5a6a;
  --text-inv: #e8f2fa;
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 28px;
  --neu-shadow-out:
    -5px -5px 15px rgba(255,255,255,0.75),
    5px 5px 15px rgba(0,0,0,0.12);
  --neu-shadow-in:
    inset -3px -3px 8px rgba(255,255,255,0.7),
    inset 3px 3px 8px rgba(0,0,0,0.1);
  --neu-shadow-dark-out:
    -5px -5px 15px rgba(255,255,255,0.05),
    5px 5px 15px rgba(0,0,0,0.4);
  --transition: 150ms ease;
  --max-w: 1160px;
  --font-head: 'Barlow Condensed', sans-serif;
  --font-body: 'Barlow', sans-serif;
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text-main);
  background: var(--blue);
  min-height: 100vh;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button, input, select, textarea { font-family: inherit; }

/* ===== 点阵底纹 ===== */
.hero-dot-bg {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, var(--dark-mid) 1px, transparent 1px);
  background-size: 22px 22px;
  opacity: 0.18;
  pointer-events: none;
  z-index: 0;
}

/* ===== 全局容器 ===== */
.section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}
.with-aside {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 40px;
  align-items: start;
}

/* ===== HEADER ===== */
.site-header {
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-mid) 100%);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 4px 24px rgba(0,0,0,0.35);
}
.header-brand-row {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 16px 24px 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand-wrap {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.brand-logo-text {
  font-family: var(--font-head);
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--blue);
  line-height: 1;
  text-transform: uppercase;
}
a.brand-logo-text:hover { color: var(--pink); transition: color var(--transition); }
.brand-tagline {
  font-size: 0.78rem;
  color: var(--blue-deep);
  letter-spacing: 0.04em;
  line-height: 1;
}

/* 搜索框 */
.search-form {
  display: flex;
  gap: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--neu-shadow-dark-out);
}
.search-input {
  background: var(--dark-mid);
  border: none;
  color: var(--text-inv);
  padding: 10px 16px;
  font-size: 0.9rem;
  width: 240px;
  outline: none;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}
.search-input::placeholder { color: #8aabb8; }
.search-input:focus { background: var(--dark-light); }
.search-btn {
  background: linear-gradient(135deg, var(--blue-deep), var(--blue));
  color: var(--dark);
  border: none;
  padding: 10px 20px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  min-height: 44px;
  transition: background var(--transition), transform var(--transition);
}
.search-btn:hover { background: linear-gradient(135deg, var(--blue), var(--pink)); transform: scale(1.03); }
.search-btn:active { transform: scale(0.97); }

/* 导航栏 */
.main-nav {
  background: rgba(23,31,38,0.85);
  border-top: 1px solid rgba(200,224,244,0.12);
}
.main-nav > p {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  align-items: stretch;
}
.main-nav > p > a {
  display: inline-flex;
  align-items: center;
  padding: 12px 16px;
  font-family: var(--font-head);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--blue);
  min-height: 44px;
  border-right: 1px solid rgba(200,224,244,0.1);
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}
.main-nav > p > a:last-child { border-right: none; }
.main-nav > p > a:hover,
.main-nav > p > a[aria-current="page"] {
  background: rgba(200,224,244,0.12);
  color: var(--pink);
}

/* ===== HERO ===== */
.hero-section {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  background: linear-gradient(145deg, var(--dark) 0%, var(--dark-mid) 60%, #1e2d3a 100%);
  overflow: hidden;
  padding: 60px 24px;
}
.hero-section .hero-content {
  position: relative;
  z-index: 1;
  text-align: right;
  max-width: 700px;
  margin-right: 0;
  margin-left: auto;
}
.hero-eyebrow {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--blue-deep);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.hero-title {
  font-family: var(--font-head);
  font-size: clamp(3rem, 8vw, 6.5rem);
  font-weight: 700;
  line-height: 1.0;
  letter-spacing: 0.02em;
  color: var(--blue);
  margin-bottom: 20px;
  text-transform: uppercase;
}
.hero-sub {
  font-size: 1.15rem;
  color: var(--text-inv);
  line-height: 1.6;
  margin-bottom: 32px;
  opacity: 0.85;
}
.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

/* 子页 hero */
.page-hero-section {
  position: relative;
  min-height: 34vh;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  background: linear-gradient(145deg, var(--dark) 0%, var(--dark-mid) 100%);
  overflow: hidden;
  padding: 48px 24px;
}
.page-hero-section .hero-content {
  position: relative;
  z-index: 1;
  text-align: right;
  max-width: 740px;
  margin-left: auto;
}
.page-title {
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3.8rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--blue);
  line-height: 1.1;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.date-row {
  display: flex;
  gap: 16px;
  justify-content: flex-end;
  font-size: 0.85rem;
  color: var(--blue-deep);
  margin-top: 8px;
}

/* ===== 按钮 ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--blue), var(--blue-deep));
  color: var(--dark);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.06em;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  min-height: 44px;
  box-shadow: var(--neu-shadow-out);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}
.btn-primary:hover { background: linear-gradient(135deg, var(--pink), var(--pink-deep)); transform: translateY(-2px); }
.btn-primary:active { transform: scale(0.97); box-shadow: var(--neu-shadow-in); }
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 2px solid var(--blue-deep);
  color: var(--blue);
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.06em;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  min-height: 44px;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}
.btn-secondary:hover { background: rgba(200,224,244,0.15); color: var(--pink); transform: translateY(-1px); }
.btn-secondary:active { transform: scale(0.97); }

/* ===== CONTENT SECTION ===== */
.content-section {
  background: var(--blue);
  padding: 56px 0;
}
.main-col {
  min-width: 0;
}

/* ===== PROSE ===== */
.prose {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-main);
}
.prose h2 {
  font-family: var(--font-head);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--dark);
  margin: 2em 0 0.6em;
  letter-spacing: 0.03em;
}
.prose h3 {
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 1.5em 0 0.5em;
}
.prose p { margin-bottom: 1em; }
.prose ul, .prose ol { padding-left: 1.4em; margin-bottom: 1em; }
.prose li { margin-bottom: 0.4em; }
.prose a { color: #3a6ea0; border-bottom: 1px solid rgba(58,110,160,0.3); }
.prose a:hover { color: var(--dark); border-color: var(--dark); }
.prose strong { font-weight: 600; color: var(--dark); }
.prose blockquote {
  border-left: 4px solid var(--blue-deep);
  padding: 12px 20px;
  background: rgba(200,224,244,0.35);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1.5em 0;
}

/* h2/h3 装饰 span */
h2 > span, h3 > span {
  display: inline;
}

/* section 标题 */
.content-section h2,
.feature-grid-section h2 {
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 700;
  color: var(--dark);
  letter-spacing: 0.04em;
  margin-bottom: 28px;
  text-transform: uppercase;
  position: relative;
}
.content-section h2::after,
.feature-grid-section h2::after {
  content: '';
  display: block;
  width: 56px;
  height: 4px;
  background: linear-gradient(90deg, var(--dark), var(--blue-deep));
  border-radius: 2px;
  margin-top: 8px;
}

/* ===== SIDEBAR / ASIDE ===== */
.sidebar {
  background: linear-gradient(145deg, var(--blue), #d8eaf8);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--neu-shadow-out);
  position: sticky;
  top: 120px;
}
.sidebar h3 {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dark);
  margin-bottom: 12px;
  margin-top: 20px;
  padding-bottom: 6px;
  border-bottom: 2px solid rgba(23,31,38,0.12);
}
.sidebar h3:first-child { margin-top: 0; }
.aside-links {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 8px;
}
.aside-link {
  display: block;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--dark);
  background: linear-gradient(145deg, #d4e8f8, #c0d8ef);
  box-shadow: var(--neu-shadow-out);
  transition: box-shadow var(--transition), transform var(--transition), color var(--transition);
  min-height: 40px;
  line-height: 1.4;
  display: flex;
  align-items: center;
}
.aside-link:hover {
  box-shadow: var(--neu-shadow-in);
  color: #1a3a5e;
  transform: scale(1.02);
}

/* ===== FEATURE GRID ===== */
.feature-grid-section {
  background: linear-gradient(180deg, #d4eaf8 0%, var(--blue) 100%);
  padding: 56px 0;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.child-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 20px;
  background: linear-gradient(145deg, #d8eaf8, #c4d8ee);
  border-radius: var(--radius-lg);
  box-shadow: var(--neu-shadow-out);
  border: 1.5px solid rgba(255,255,255,0.6);
  transition: box-shadow var(--transition), transform var(--transition);
  min-height: 120px;
}
.child-card:hover {
  box-shadow: var(--neu-shadow-in);
  transform: translateY(2px) scale(0.99);
}
.child-card > strong {
  font-family: var(--font-head);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--dark);
  letter-spacing: 0.03em;
}
.child-card > .card-desc {
  font-size: 0.88rem;
  color: var(--text-soft);
  line-height: 1.5;
}

/* ===== PRICING ===== */
.pricing-tiers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-bottom: 40px;
}
.tier-card {
  background: linear-gradient(145deg, #d8eaf8, #c4d8ee);
  border-radius: var(--radius-lg);
  box-shadow: var(--neu-shadow-out);
  padding: 32px 28px;
  position: relative;
  border: 1.5px solid rgba(255,255,255,0.5);
}
.tier-card.tier-vip {
  background: linear-gradient(145deg, var(--pink), var(--pink-deep));
}
.tier-badge {
  position: absolute;
  top: -14px;
  right: 24px;
  background: var(--dark);
  color: var(--blue);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.85rem;
  padding: 4px 16px;
  border-radius: 20px;
  letter-spacing: 0.08em;
}
.tier-header { margin-bottom: 20px; }
.tier-header h2 {
  font-family: var(--font-head);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 8px;
}
.tier-price {
  display: flex;
  align-items: baseline;
  gap: 6px;
}
.price-num {
  font-family: var(--font-head);
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--dark);
}
.price-unit {
  font-size: 1rem;
  color: var(--text-soft);
}
.tier-features {
  list-style: none;
  margin-bottom: 24px;
}
.tier-features li {
  padding: 6px 0;
  border-bottom: 1px solid rgba(23,31,38,0.08);
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 8px;
}
.tier-features li::before {
  content: '✓';
  font-weight: 700;
  color: #3a6ea0;
}
.tier-vip .tier-features li::before { color: #9a3a60; }

/* ===== FAQ ===== */
.faq-intro {
  margin-bottom: 28px;
}
.faq-intro h2 {
  font-family: var(--font-head);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 10px;
}
.faq-intro a { color: #3a6ea0; border-bottom: 1px solid rgba(58,110,160,0.3); }
.faq-list details {
  background: linear-gradient(145deg, #d8eaf8, #c8e0f4);
  border-radius: var(--radius-md);
  box-shadow: var(--neu-shadow-out);
  margin-bottom: 14px;
  overflow: hidden;
  border: 1.5px solid rgba(255,255,255,0.6);
}
.faq-list summary {
  font-family: var(--font-head);
  font-size: 1.05rem;
  font-weight: 600;
  padding: 16px 20px;
  cursor: pointer;
  color: var(--dark);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 52px;
  transition: background var(--transition);
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: '+';
  font-size: 1.4rem;
  font-weight: 300;
  transition: transform var(--transition);
}
.faq-list details[open] summary::after { transform: rotate(45deg); }
.faq-list details[open] summary { background: rgba(200,224,244,0.4); }
.faq-list .faq-answer {
  padding: 0 20px 18px;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-soft);
}

/* ===== ABOUT ===== */
.about-contact.neu-card {
  background: linear-gradient(145deg, #d8eaf8, #c8ddf0);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--neu-shadow-out);
  margin: 24px 0;
}
.about-contact p { margin-bottom: 0.7em; }
.about-contact a { color: #3a6ea0; border-bottom: 1px solid rgba(58,110,160,0.3); }

/* ===== BOTTOM NAV LINKS ===== */
.bottom-nav-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid rgba(23,31,38,0.1);
}

/* ===== FOOTER ===== */
.site-footer {
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-mid) 100%);
  text-align: center;
  padding: 32px 24px 24px;
}
.site-footer > p {
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 600;
  color: var(--blue);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}
.site-footer > small {
  font-size: 0.82rem;
  color: var(--blue-deep);
  line-height: 1.8;
}
.site-footer > small a {
  color: var(--pink);
  transition: color var(--transition);
}
.site-footer > small a:hover { color: var(--white); }

/* ===== SCROLL REVEAL ===== */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.5s ease, transform 0.5s ease;
  }
  .reveal.visible {
    opacity: 1;
    transform: none;
  }
  .child-card {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.4s ease, transform 0.4s ease, box-shadow var(--transition);
  }
  .child-card.visible {
    opacity: 1;
    transform: none;
  }
  .tier-card {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
  }
  .tier-card.visible {
    opacity: 1;
    transform: none;
  }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .with-aside {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: static;
  }
  .pricing-tiers {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .header-brand-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 16px 10px;
  }
  .search-input {
    width: 160px;
  }
  .search-form {
    width: 100%;
  }
  .search-input {
    flex: 1;
    width: auto;
  }
  .main-nav > p {
    padding: 0 8px;
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .main-nav > p::-webkit-scrollbar { display: none; }
  .main-nav > p > a {
    padding: 12px 12px;
    font-size: 0.85rem;
    flex-shrink: 0;
  }
  .hero-section {
    min-height: 55vh;
    padding: 40px 20px;
    justify-content: center;
  }
  .hero-section .hero-content {
    text-align: right;
    max-width: 100%;
  }
  .hero-title { font-size: clamp(2.4rem, 12vw, 4rem); }
  .hero-cta { justify-content: flex-end; }
  .page-hero-section {
    min-height: 28vh;
    padding: 36px 20px;
  }
  .page-title { font-size: clamp(1.6rem, 8vw, 2.6rem); }
  .feature-grid {
    grid-template-columns: 1fr 1fr;
  }
  .section-inner { padding: 0 16px; }
  .content-section { padding: 36px 0; }
  .feature-grid-section { padding: 36px 0; }
  .child-card { padding: 18px 14px; border-radius: 20px; }
}

@media (max-width: 400px) {
  .feature-grid { grid-template-columns: 1fr; }
  .hero-cta { flex-direction: column; align-items: flex-end; }
  .brand-logo-text { font-size: 1.8rem; }
}