/* ==========================================================================
   坨坨云 (Tuotuo Cloud) - 极简北欧风 (Nordic Light) Bento Design System
   Domain: tuotuoyun.homes
   ========================================================================== */

:root {
  /* Color Palette - Nordic Light & Sage Accent */
  --bg-primary: #FAFBF9;
  --bg-secondary: #F3F5F1;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F8FAF7;
  
  --text-main: #1C2826;
  --text-muted: #5C6B66;
  --text-light: #8E9C97;
  
  --sage-primary: #3E6B5C;
  --sage-hover: #315549;
  --sage-light: #EBF2EE;
  --sage-border: rgba(62, 107, 92, 0.18);
  
  --accent-gold: #D99B26;
  --accent-gold-bg: #FDF8EC;
  
  --border-color: #E5E9E4;
  --border-subtle: rgba(0, 0, 0, 0.05);
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.04);
  --shadow-hover: 0 12px 40px rgba(62, 107, 92, 0.08);

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  
  /* Radius & Transitions */
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-family);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

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

/* Layout Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Section Spacing - Asymmetrical & Nordic Generous Whitespace */
.section {
  padding: 80px 0;
}

.section-asymmetric-top {
  padding-top: 110px;
  padding-bottom: 70px;
}

.section-asymmetric-bottom {
  padding-top: 60px;
  padding-bottom: 120px;
}

/* Typography Utilities */
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background-color: var(--sage-light);
  color: var(--sage-primary);
  border: 1px solid var(--sage-border);
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 600;
  color: var(--text-main);
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 680px;
  line-height: 1.7;
}

.header-group {
  margin-bottom: 48px;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 251, 249, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition-fast);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.01em;
}

.brand-logo img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: cover;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 500;
  transition: var(--transition-fast);
}

.nav-link:hover {
  color: var(--sage-primary);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  background-color: var(--sage-primary);
  color: #ffffff;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.nav-cta:hover {
  background-color: var(--sage-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* --------------------------------------------------------------------------
   Bento Box Layout Utilities
   -------------------------------------------------------------------------- */
.bento-grid {
  display: grid;
  gap: 20px;
}

.bento-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.bento-card:hover {
  border-color: var(--sage-border);
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

/* --------------------------------------------------------------------------
   Hero Section - Asymmetrical 3x3 Bento Layout
   -------------------------------------------------------------------------- */
.hero-bento-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 24px;
  align-items: stretch;
}

.hero-main-card {
  grid-column: 1 / 2;
  background: linear-gradient(145deg, #FFFFFF 0%, #F5F8F5 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 48px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-md);
}

.hero-sub-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 20px;
}

.hero-badge-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.hero-title {
  font-size: 2.75rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  color: var(--text-main);
  margin-bottom: 20px;
}

.hero-title .highlight {
  color: var(--sage-primary);
  position: relative;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 36px;
}

/* Hero 3 Side-by-Side Responsive Buttons Group */
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 26px;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-fast);
  white-space: nowrap;
  border: 1px solid transparent;
  text-align: center;
}

/* Button 1: Primary Action */
.btn-primary {
  background-color: var(--sage-primary);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(62, 107, 92, 0.25);
}

.btn-primary:hover {
  background-color: var(--sage-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(62, 107, 92, 0.35);
}

/* Button 2 & 3: Secondary Actions (Identical Aesthetics) */
.btn-secondary {
  background-color: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: var(--sage-light);
  color: var(--sage-primary);
  border-color: var(--sage-border);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Hero Data Cards (Right Bento Grid) */
.hero-data-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition-smooth);
}

.hero-data-card:hover {
  border-color: var(--sage-border);
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.hero-data-card .card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background-color: var(--sage-light);
  color: var(--sage-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.hero-data-card .card-val {
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
  margin-bottom: 4px;
}

.hero-data-card .card-lbl {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   Feature Bento Grid Section
   -------------------------------------------------------------------------- */
.feature-bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-bento-grid .card-wide {
  grid-column: span 2;
}

.feature-bento-grid .card-tall {
  grid-row: span 2;
}

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

.feature-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background-color: var(--sage-light);
  color: var(--sage-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.feature-card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-main);
}

.feature-card-desc {
  font-size: 0.975rem;
  color: var(--text-muted);
  line-height: 1.65;
}

.feature-list {
  list-style: none;
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.925rem;
  color: var(--text-muted);
}

.feature-list li svg {
  color: var(--sage-primary);
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   Pricing Bento Section - Tabbed & Asymmetrical Horizontal Cards
   -------------------------------------------------------------------------- */
.pricing-tabs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: var(--bg-secondary);
  padding: 6px;
  border-radius: 100px;
  width: fit-content;
  margin: 0 auto 40px auto;
  border: 1px solid var(--border-color);
}

.tab-btn {
  padding: 10px 24px;
  border-radius: 100px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: var(--transition-fast);
}

.tab-btn.active {
  background-color: #FFFFFF;
  color: var(--sage-primary);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.pricing-bento-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 24px;
}

.pricing-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 36px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: var(--transition-smooth);
}

.pricing-card.featured {
  background: linear-gradient(160deg, #FFFFFF 0%, #F2F7F4 100%);
  border: 2px solid var(--sage-primary);
  box-shadow: var(--shadow-md);
}

.pricing-badge {
  position: absolute;
  top: 24px;
  right: 24px;
  padding: 4px 14px;
  background-color: var(--sage-primary);
  color: #FFFFFF;
  font-size: 0.775rem;
  font-weight: 700;
  border-radius: 100px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.plan-price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 28px;
}

.plan-currency {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--sage-primary);
}

.plan-price {
  font-size: 3rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1;
  letter-spacing: -0.03em;
}

.plan-period {
  font-size: 0.9rem;
  color: var(--text-light);
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 32px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 20px;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.925rem;
  color: var(--text-muted);
}

.plan-features li svg {
  color: var(--sage-primary);
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   Articles Matrix Bento Section
   -------------------------------------------------------------------------- */
.articles-bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.article-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition-smooth);
}

.article-card:hover {
  border-color: var(--sage-border);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.article-meta {
  font-size: 0.825rem;
  color: var(--sage-primary);
  font-weight: 600;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 12px;
}

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
}

.article-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--sage-primary);
  transition: var(--transition-fast);
}

.article-link:hover {
  gap: 10px;
  color: var(--sage-hover);
}

/* --------------------------------------------------------------------------
   Testimonials Section
   -------------------------------------------------------------------------- */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.testimonial-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.testimonial-stars {
  color: var(--accent-gold);
  margin-bottom: 14px;
  display: flex;
  gap: 4px;
}

.testimonial-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.avatar-placeholder {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--sage-light);
  color: var(--sage-primary);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}

.author-info h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
}

.author-info p {
  font-size: 0.8rem;
  color: var(--text-light);
}

/* --------------------------------------------------------------------------
   FAQ Accordion Section
   -------------------------------------------------------------------------- */
.faq-wrapper {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--sage-border);
}

.faq-question {
  width: 100%;
  padding: 22px 28px;
  background: transparent;
  border: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  text-align: left;
}

.faq-icon {
  width: 24px;
  height: 24px;
  color: var(--sage-primary);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
  padding: 0 28px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 28px 24px 28px;
  transition: max-height 0.35s ease-in-out;
}

/* --------------------------------------------------------------------------
   PBN Footer Section - Strict SEO Compliance
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: #F2F4F0;
  border-top: 1px solid var(--border-color);
  padding: 60px 0 40px 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 24px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
}

.footer-brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-light);
}

/* Footer Friendly Links Area - PBN Link Pipeline */
.pbn-links-area {
  margin-top: 12px;
  padding-top: 20px;
  border-top: 1px dashed var(--border-color);
  width: 100%;
  max-width: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  font-size: 0.825rem;
  color: var(--text-light);
}

.pbn-links-title {
  font-weight: 600;
  color: var(--text-muted);
}

.pbn-link {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition-fast);
  border-bottom: 1px dotted var(--text-light);
}

.pbn-link:hover {
  color: var(--sage-primary);
  border-bottom-color: var(--sage-primary);
}

/* Article Page Layout Styles */
.article-container {
  max-width: 860px;
  margin: 60px auto;
  padding: 0 24px;
}

.article-header {
  margin-bottom: 40px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 30px;
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #2D3748;
}

.article-body h2 {
  font-size: 1.65rem;
  font-weight: 600;
  color: var(--text-main);
  margin: 40px 0 20px 0;
  line-height: 1.3;
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-main);
  margin: 30px 0 15px 0;
}

.article-body p {
  margin-bottom: 24px;
}

.article-body ul, .article-body ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

.article-body li {
  margin-bottom: 8px;
}

.article-cta-box {
  background: var(--sage-light);
  border: 1px solid var(--sage-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin: 40px 0;
  text-align: center;
}

/* --------------------------------------------------------------------------
   Responsive Breakpoints - Essential Mobile Adaptations
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-bento-grid {
    grid-template-columns: 1fr;
  }
  
  .feature-bento-grid,
  .articles-bento-grid,
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-bento-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  
  .hero-title {
    font-size: 2.15rem;
  }
  
  .hero-main-card {
    padding: 32px 24px;
  }
  
  .hero-sub-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }
  
  .btn {
    width: 100%;
  }
  
  .feature-bento-grid,
  .articles-bento-grid,
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
  
  .feature-bento-grid .card-wide {
    grid-column: span 1;
  }

  .pbn-links-area {
    flex-direction: column;
    gap: 8px;
  }
}