/* ==========================================================================
   咕嘎云 (guga.homes) - 极简高质原生样式表 (Frosted Glass Atmosphere)
   ========================================================================== */

:root {
  --bg-primary: #E9F1F5;
  --bg-card: rgba(255, 255, 255, 0.72);
  --bg-card-hover: rgba(255, 255, 255, 0.88);
  --ink-primary: #12303E;
  --ink-secondary: #4A6977;
  --ink-muted: #78929E;
  --accent: #1F7A99;
  --accent-hover: #17637D;
  --accent-light: rgba(31, 122, 153, 0.12);
  --accent-glow: rgba(31, 122, 153, 0.28);
  --card-border: rgba(255, 255, 255, 0.85);
  --card-radius: 22px;
  --card-shadow: 0 18px 45px -10px rgba(18, 48, 62, 0.08), 0 4px 14px rgba(18, 48, 62, 0.03);
  --card-shadow-hover: 0 28px 60px -12px rgba(18, 48, 62, 0.14), 0 8px 22px rgba(18, 48, 62, 0.05);
  --transition-smooth: all 0.35s cubic-bezier(0.2, 0.8, 0.2, 1);
  --container-max: 1200px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--bg-primary);
  color: var(--ink-primary);
  font-family: 'Manrope', 'Noto Sans SC', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --------------------------------------------------------------------------
   背景悬浮柔光雾气层 (Light Blobs & Parallax)
   -------------------------------------------------------------------------- */
.blob-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.65;
  transition: transform 0.2s cubic-bezier(0.1, 0.8, 0.2, 1);
  will-change: transform;
}

.blob-1 {
  width: 550px;
  height: 550px;
  top: -120px;
  left: -80px;
  background: radial-gradient(circle, rgba(31, 122, 153, 0.32) 0%, rgba(162, 214, 230, 0.18) 50%, transparent 70%);
  animation: floatSlow 22s ease-in-out infinite alternate;
}

.blob-2 {
  width: 650px;
  height: 650px;
  top: 35%;
  right: -150px;
  background: radial-gradient(circle, rgba(74, 169, 199, 0.28) 0%, rgba(200, 230, 240, 0.22) 55%, transparent 75%);
  animation: floatMedium 18s ease-in-out infinite alternate-reverse;
}

.blob-3 {
  width: 600px;
  height: 600px;
  bottom: -150px;
  left: 20%;
  background: radial-gradient(circle, rgba(31, 122, 153, 0.22) 0%, rgba(180, 220, 235, 0.16) 60%, transparent 80%);
  animation: floatSlow 26s ease-in-out infinite alternate;
}

@keyframes floatSlow {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(45px, 35px) scale(1.08); }
  100% { transform: translate(-30px, 60px) scale(0.96); }
}

@keyframes floatMedium {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-50px, -40px) scale(1.1); }
  100% { transform: translate(35px, 45px) scale(0.94); }
}

/* --------------------------------------------------------------------------
   通用布局与毛玻璃基础类
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

.frosted-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--card-border);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  transition: var(--transition-smooth);
}

.frosted-card:hover {
  background: var(--bg-card-hover);
  box-shadow: var(--card-shadow-hover);
}

.section {
  padding: 90px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px auto;
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-light);
  border-radius: 999px;
  margin-bottom: 16px;
  border: 1px solid rgba(31, 122, 153, 0.2);
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  color: var(--ink-primary);
  line-height: 1.25;
  margin-bottom: 18px;
}

.section-desc {
  font-size: 1.08rem;
  color: var(--ink-secondary);
  line-height: 1.65;
}

/* --------------------------------------------------------------------------
   顶部导航栏 (Navbar)
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 16px;
  z-index: 100;
  margin: 0 auto;
  padding: 0 24px;
  max-width: calc(var(--container-max) + 48px);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 28px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 10px 30px -8px rgba(18, 48, 62, 0.08);
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--ink-primary);
}

.brand-icon {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent) 0%, #15556C 100%);
  color: #fff;
  box-shadow: 0 4px 12px var(--accent-glow);
}

.brand-icon svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  text-decoration: none;
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--ink-secondary);
  transition: color 0.25s ease;
  position: relative;
  padding: 6px 0;
}

.nav-link:hover,
.nav-link.active {
  color: var(--accent);
}

.nav-link.nav-highlight {
  color: var(--accent);
  font-weight: 700;
  background: var(--accent-light);
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid rgba(31, 122, 153, 0.25);
}

.nav-link.nav-highlight:hover {
  background: rgba(31, 122, 153, 0.2);
}

.btn-nav {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 22px;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 700;
  color: #ffffff;
  background: linear-gradient(135deg, var(--accent) 0%, #17637D 100%);
  box-shadow: 0 6px 16px var(--accent-glow);
  transition: var(--transition-smooth);
}

.btn-nav:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 22px var(--accent-glow);
}

/* --------------------------------------------------------------------------
   主视觉区 (Hero Section)
   -------------------------------------------------------------------------- */
.hero {
  padding: 80px 0 70px 0;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 18px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.9);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--ink-primary);
  margin-bottom: 24px;
  box-shadow: 0 4px 16px rgba(18, 48, 62, 0.05);
}

.hero-pill-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10B981;
  box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.2);
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
  70% { box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--ink-primary);
  line-height: 1.18;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.hero-title .brand-gradient {
  background: linear-gradient(135deg, var(--ink-primary) 20%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 18px;
}

.hero-desc {
  max-width: 760px;
  margin: 0 auto 36px auto;
  font-size: 1.12rem;
  color: var(--ink-secondary);
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

/* 按钮通用规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 34px;
  border-radius: 999px;
  font-size: 1.05rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.btn-primary {
  color: #ffffff;
  background: linear-gradient(135deg, var(--accent) 0%, #155E75 100%);
  box-shadow: 0 12px 26px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 34px rgba(31, 122, 153, 0.38);
}

.btn-hero-blog {
  color: var(--ink-primary);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.95);
  box-shadow: 0 8px 24px rgba(18, 48, 62, 0.06);
}

.btn-hero-blog:hover {
  transform: translateY(-3px);
  background: #ffffff;
  color: var(--accent);
  box-shadow: 0 14px 30px rgba(18, 48, 62, 0.1);
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  max-width: 820px;
  margin: 0 auto;
  padding: 24px 32px;
}

.stat-item {
  flex: 1;
  text-align: center;
}

.stat-num {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--ink-primary);
  display: block;
  line-height: 1.2;
}

.stat-num small {
  font-size: 1rem;
  color: var(--accent);
  margin-left: 2px;
}

.stat-label {
  font-size: 0.88rem;
  color: var(--ink-secondary);
  font-weight: 500;
  margin-top: 4px;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: rgba(18, 48, 62, 0.1);
}

/* --------------------------------------------------------------------------
   3D倾斜核心优势卡片 (Feature Cards - 3D Tilt)
   -------------------------------------------------------------------------- */
.tilt-card-wrapper {
  perspective: 700px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.tilt-card {
  padding: 38px 30px;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.25s ease-out, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
}

.tilt-card-content {
  transform: translateZ(24px);
}

.feature-icon-box {
  width: 64px;
  height: 64px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(31, 122, 153, 0.15) 0%, rgba(31, 122, 153, 0.05) 100%);
  border: 1px solid rgba(31, 122, 153, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  margin-bottom: 24px;
  box-shadow: 0 6px 16px rgba(31, 122, 153, 0.1);
}

.feature-icon-box svg {
  width: 32px;
  height: 32px;
  fill: currentColor;
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--ink-primary);
  margin-bottom: 14px;
}

.feature-desc {
  font-size: 0.98rem;
  color: var(--ink-secondary);
  line-height: 1.68;
}

/* --------------------------------------------------------------------------
   流媒体与AI支持卡片 (Streaming & AI Showcase)
   -------------------------------------------------------------------------- */
.ecosystem-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

.ecosystem-card {
  padding: 40px 34px;
}

.ecosystem-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.ecosystem-header-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--accent-light);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.ecosystem-header-icon svg {
  width: 28px;
  height: 28px;
  fill: currentColor;
}

.ecosystem-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--ink-primary);
}

.ecosystem-desc {
  font-size: 1rem;
  color: var(--ink-secondary);
  line-height: 1.65;
  margin-bottom: 24px;
}

.brand-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.brand-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(18, 48, 62, 0.08);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink-primary);
  box-shadow: 0 2px 8px rgba(18, 48, 62, 0.03);
}

.tag-badge {
  font-size: 0.72rem;
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 700;
}

/* --------------------------------------------------------------------------
   套餐价格对比表 (Pricing Table)
   -------------------------------------------------------------------------- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  padding: 34px 26px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition-smooth);
}

.pricing-card.popular {
  border: 2px solid var(--accent);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 24px 50px -10px rgba(31, 122, 153, 0.22);
  transform: translateY(-8px);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--accent) 0%, #15556C 100%);
  color: #ffffff;
  padding: 4px 16px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  box-shadow: 0 4px 12px var(--accent-glow);
}

.pricing-tier {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink-primary);
  margin-bottom: 6px;
}

.pricing-sub {
  font-size: 0.86rem;
  color: var(--ink-secondary);
  min-height: 22px;
  margin-bottom: 20px;
}

.pricing-cost {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(18, 48, 62, 0.08);
}

.price-currency {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink-primary);
}

.price-amount {
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--ink-primary);
  letter-spacing: -0.02em;
}

.price-period {
  font-size: 0.88rem;
  color: var(--ink-muted);
}

.pricing-features {
  list-style: none;
  margin-bottom: 28px;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--ink-secondary);
  margin-bottom: 12px;
  line-height: 1.45;
}

.check-icon {
  width: 18px;
  height: 18px;
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.btn-pricing {
  width: 100%;
  padding: 13px 20px;
  border-radius: 999px;
  text-align: center;
  font-size: 0.98rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--accent);
  background: rgba(31, 122, 153, 0.09);
  border: 1px solid rgba(31, 122, 153, 0.25);
  transition: var(--transition-smooth);
}

.btn-pricing:hover {
  background: var(--accent);
  color: #ffffff;
  box-shadow: 0 8px 20px var(--accent-glow);
}

.pricing-card.popular .btn-pricing {
  background: linear-gradient(135deg, var(--accent) 0%, #155E75 100%);
  color: #ffffff;
  border: none;
  box-shadow: 0 8px 20px var(--accent-glow);
}

.pricing-card.popular .btn-pricing:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 26px rgba(31, 122, 153, 0.35);
}

/* --------------------------------------------------------------------------
   用户评价 (User Reviews)
   -------------------------------------------------------------------------- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.review-card {
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
}

.review-stars {
  display: flex;
  gap: 4px;
  color: #F59E0B;
  margin-bottom: 16px;
}

.review-text {
  font-size: 0.95rem;
  color: var(--ink-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.reviewer {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid rgba(18, 48, 62, 0.08);
}

.reviewer-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, #A2D6E6 0%, #C8E6F0 100%);
  color: var(--ink-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
}

.reviewer-name {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--ink-primary);
}

.reviewer-title {
  font-size: 0.8rem;
  color: var(--ink-muted);
}

/* --------------------------------------------------------------------------
   常见问题解答 (FAQ)
   -------------------------------------------------------------------------- */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
  max-width: 1040px;
  margin: 0 auto;
}

.faq-card {
  padding: 30px 28px;
  position: relative;
}

.faq-num {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--accent);
  opacity: 0.85;
  margin-bottom: 10px;
  letter-spacing: 0.05em;
}

.faq-question {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--ink-primary);
  margin-bottom: 12px;
  line-height: 1.4;
}

.faq-answer {
  font-size: 0.96rem;
  color: var(--ink-secondary);
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   底栏 (Footer - 严格遵循只保留4个标题且新页面打开)
   -------------------------------------------------------------------------- */
.site-footer {
  padding: 60px 0 45px 0;
  border-top: 1px solid rgba(18, 48, 62, 0.08);
  margin-top: 50px;
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.footer-link {
  text-decoration: none;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--ink-primary);
  transition: color 0.25s ease;
  position: relative;
  padding: 6px 12px;
  border-radius: 8px;
}

.footer-link:hover {
  color: var(--accent);
  background: var(--accent-light);
}

.footer-bottom {
  text-align: center;
  font-size: 0.88rem;
  color: var(--ink-muted);
}

/* --------------------------------------------------------------------------
   响应式断点适配 (@media)
   -------------------------------------------------------------------------- */
@media (max-width: 1080px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 820px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
  .ecosystem-grid {
    grid-template-columns: 1fr;
  }
  .faq-grid {
    grid-template-columns: 1fr;
  }
  .hero-title {
    font-size: 2.5rem;
  }
  .hero-stats {
    flex-direction: column;
    gap: 20px;
  }
  .stat-divider {
    display: none;
  }
  .navbar {
    padding: 10px 18px;
  }
  .nav-menu {
    display: none; /* 简化移动端，突出核心操作 */
  }
}

@media (max-width: 580px) {
  .section {
    padding: 60px 0;
  }
  .hero {
    padding: 50px 0 40px 0;
  }
  .hero-title {
    font-size: 2.1rem;
  }
  .hero-subtitle {
    font-size: 1.15rem;
  }
  .hero-desc {
    font-size: 1rem;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .btn {
    width: 100%;
    min-height: 50px;
  }
  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }
}

/* --------------------------------------------------------------------------
   通用面包屑导航 (SEO & Accessible Breadcrumb)
   -------------------------------------------------------------------------- */
.breadcrumb-nav {
  margin-bottom: 24px;
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  font-size: 0.92rem;
  color: var(--ink-muted);
}

.breadcrumb-list a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s ease;
}

.breadcrumb-list a:hover {
  text-decoration: underline;
  color: var(--accent-hover);
}

.breadcrumb-separator {
  color: var(--ink-muted);
  user-select: none;
}