/* ==========================================================================
   咕嘎云 (Guga Cloud) - 官方极简极速样式表
   Design: Cream (#FFF8F0), Coral (#FF6B6B), Warm Orange (#FFA94D)
   Typography: Poppins + Nunito (Local fallback ready, zero-dependency)
   ========================================================================== */

:root {
  --bg-cream: #FFF8F0;
  --bg-cream-card: #FFFFFF;
  --bg-cream-subtle: #FFF2E2;
  --text-main: #2D3748;
  --text-muted: #64748B;
  --text-light: #94A3B8;
  
  --coral-primary: #FF6B6B;
  --coral-hover: #FA5252;
  --orange-warm: #FFA94D;
  --orange-light: #FFE8CC;
  
  --pastel-peach: #FFD4B8;
  --pastel-mint: #C3F0CA;
  --pastel-lavender: #E8D5F5;
  --pastel-sky: #D0EBFF;
  
  --radius-card: 22px;
  --radius-pill: 100px;
  --radius-sm: 12px;
  
  --shadow-soft: 0 8px 30px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 16px 36px rgba(255, 107, 107, 0.18);
  --shadow-card-hover: 0 14px 32px rgba(0, 0, 0, 0.08);
  
  --font-heading: 'Poppins', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: 'Nunito', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  
  --transition-fast: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-cream);
  color: var(--text-main);
  font-family: var(--font-body);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-main);
  line-height: 1.25;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition-fast);
}

img, svg {
  display: block;
  max-width: 100%;
}

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 248, 240, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 169, 77, 0.15);
  transition: all 0.3s ease;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--coral-primary);
}

.brand-logo .logo-emoji {
  display: inline-block;
  font-size: 1.8rem;
  transition: transform 0.3s ease;
}

.brand-logo:hover .logo-emoji {
  transform: rotate(-12deg) scale(1.15);
}

.brand-logo span.brand-text {
  background: linear-gradient(135deg, var(--coral-primary), var(--orange-warm));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  padding: 8px 12px;
  border-radius: var(--radius-pill);
  transition: var(--transition-fast);
}

.nav-link:hover {
  color: var(--coral-primary);
  background-color: rgba(255, 107, 107, 0.08);
}

.nav-link.highlight {
  color: #D9480F;
  background: var(--pastel-peach);
  padding: 6px 14px;
}

.nav-link.highlight:hover {
  background: #FFC099;
  transform: translateY(-2px);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ==========================================================================
   Buttons (100px Pill Buttons with Playful Micro-Interactions)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  padding: 14px 32px;
  border-radius: var(--radius-pill);
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-soft);
  transition: var(--transition-fast);
  text-align: center;
  white-space: nowrap;
}

.btn-emoji {
  display: inline-block;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.btn:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: var(--shadow-hover);
}

.btn:hover .btn-emoji {
  transform: scale(1.3) rotate(15deg);
}

.btn:active {
  transform: translateY(-1px) scale(0.99);
}

.btn-primary {
  background: linear-gradient(135deg, var(--coral-primary), var(--orange-warm));
  color: #FFFFFF;
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--coral-hover), #F76707);
}

.btn-secondary {
  background-color: #FFFFFF;
  color: var(--text-main);
  border: 2px solid var(--orange-warm);
}

.btn-secondary:hover {
  background-color: #FFF4E6;
  border-color: var(--coral-primary);
  color: var(--coral-primary);
}

.btn-sm {
  padding: 10px 22px;
  font-size: 0.9rem;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  padding: 70px 0 60px;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: #FFFFFF;
  border: 1px solid var(--orange-light);
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 600;
  color: #D9480F;
  margin-bottom: 24px;
  box-shadow: 0 4px 14px rgba(255, 169, 77, 0.12);
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 20px;
  line-height: 1.18;
}

.hero-title .highlight-text {
  background: linear-gradient(135deg, var(--coral-primary), var(--orange-warm));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.35rem;
  font-weight: 600;
  color: #4A5568;
  margin-bottom: 16px;
}

.hero-intro {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-stats-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  padding: 22px 32px;
  background-color: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(255, 169, 77, 0.2);
  border-radius: var(--radius-card);
  max-width: 820px;
  margin: 0 auto;
  box-shadow: var(--shadow-soft);
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-number {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--coral-primary);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Section Generic Header
   ========================================================================== */
.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 50px;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--coral-primary);
  margin-bottom: 10px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Feature Cards Section (3 Main Cards with Pastel Circles)
   ========================================================================== */
.features-section {
  padding: 60px 0;
}

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

.feature-card {
  background-color: var(--bg-cream-card);
  border-radius: var(--radius-card);
  padding: 40px 32px;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(255, 230, 204, 0.6);
  transition: var(--transition-fast);
  display: flex;
  flex-direction: column;
  position: relative;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-card-hover);
}

.icon-circle {
  width: 76px;
  height: 76px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  margin-bottom: 24px;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.feature-card:hover .icon-circle {
  transform: scale(1.1) rotate(8deg);
}

.icon-peach {
  background-color: var(--pastel-peach);
}

.icon-mint {
  background-color: var(--pastel-mint);
}

.icon-lavender {
  background-color: var(--pastel-lavender);
}

.feature-card h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.65;
}

.feature-card .feature-list {
  list-style: none;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px dashed #F1F5F9;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feature-card .feature-list li {
  font-size: 0.9rem;
  color: #4A5568;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ==========================================================================
   Streaming & AI Support Cards
   ========================================================================== */
.streaming-ai-section {
  padding: 60px 0;
  background-color: rgba(255, 255, 255, 0.45);
  border-top: 1px solid rgba(255, 169, 77, 0.1);
  border-bottom: 1px solid rgba(255, 169, 77, 0.1);
}

.unlock-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.unlock-card {
  background-color: var(--bg-cream-card);
  border-radius: var(--radius-card);
  padding: 36px;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(255, 230, 204, 0.6);
}

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

.unlock-header .header-emoji {
  font-size: 2.2rem;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--pastel-sky);
  display: flex;
  align-items: center;
  justify-content: center;
}

.unlock-header h3 {
  font-size: 1.35rem;
  font-weight: 700;
}

.unlock-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

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

.tag-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: var(--bg-cream-subtle);
  border: 1px solid var(--orange-light);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 600;
  color: #C92A2A;
}

/* ==========================================================================
   Pricing Table Section
   ========================================================================== */
.pricing-section {
  padding: 70px 0;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.pricing-card {
  background-color: var(--bg-cream-card);
  border-radius: var(--radius-card);
  padding: 34px 24px;
  box-shadow: var(--shadow-soft);
  border: 2px solid transparent;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition-fast);
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-card-hover);
}

.pricing-card.popular {
  border-color: var(--coral-primary);
  box-shadow: 0 12px 35px rgba(255, 107, 107, 0.14);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--coral-primary), var(--orange-warm));
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 16px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.5px;
  box-shadow: 0 4px 10px rgba(255, 107, 107, 0.3);
}

.pricing-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.pricing-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-height: 40px;
  margin-bottom: 20px;
}

.price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px dashed #E2E8F0;
}

.price-currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--coral-primary);
}

.price-amount {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--coral-primary);
  line-height: 1;
}

.price-period {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.pricing-specs {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 30px;
  flex-grow: 1;
}

.pricing-specs li {
  font-size: 0.88rem;
  color: #4A5568;
  display: flex;
  align-items: center;
  gap: 8px;
}

.pricing-specs li strong {
  color: var(--text-main);
}

.pricing-specs li .spec-icon {
  color: #12B886;
  font-weight: 700;
}

.pricing-card .btn {
  width: 100%;
}

/* ==========================================================================
   Testimonial Section (Rounded Avatars + Stars)
   ========================================================================== */
.testimonials-section {
  padding: 60px 0;
  background-color: rgba(255, 255, 255, 0.45);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.testimonial-card {
  background-color: var(--bg-cream-card);
  border-radius: var(--radius-card);
  padding: 32px 28px;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(255, 230, 204, 0.6);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.stars-rating {
  color: #FAB005;
  font-size: 1.1rem;
  letter-spacing: 2px;
  margin-bottom: 14px;
}

.testimonial-text {
  font-size: 0.95rem;
  color: #4A5568;
  line-height: 1.65;
  margin-bottom: 24px;
  font-style: normal;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 14px;
}

.avatar-circle {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  font-weight: 700;
  color: #FFFFFF;
}

.avatar-peach { background: #FF922B; }
.avatar-mint { background: #20C997; }
.avatar-coral { background: #FF6B6B; }

.user-meta h4 {
  font-size: 0.95rem;
  font-weight: 700;
}

.user-meta span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==========================================================================
   FAQ Section (Accordion / Details)
   ========================================================================== */
.faq-section {
  padding: 70px 0;
}

.faq-container {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background-color: var(--bg-cream-card);
  border-radius: 18px;
  border: 1px solid rgba(255, 230, 204, 0.7);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.03);
  overflow: hidden;
  transition: var(--transition-fast);
}

.faq-item[open] {
  border-color: var(--orange-warm);
  box-shadow: var(--shadow-soft);
}

.faq-question {
  padding: 22px 28px;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  list-style: none;
}

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

.faq-toggle-icon {
  display: inline-block;
  font-size: 1.2rem;
  color: var(--coral-primary);
  transition: transform 0.25s ease;
}

.faq-item[open] .faq-toggle-icon {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 28px 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ==========================================================================
   Footer (Strictly 4 titles opening in new tab + clean layout)
   ========================================================================== */
.site-footer {
  background-color: #2D3748;
  color: #E2E8F0;
  padding: 50px 0 35px;
  margin-top: 60px;
}

.footer-nav-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.footer-links-strict {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  flex-wrap: wrap;
  margin-bottom: 30px;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  width: 100%;
  max-width: 720px;
}

.footer-strict-link {
  font-size: 1.05rem;
  font-weight: 600;
  color: #F8F9FA;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: var(--transition-fast);
}

.footer-strict-link:hover {
  color: #FFA94D;
  background: rgba(255, 169, 77, 0.15);
  border-color: #FFA94D;
  transform: translateY(-2px);
}

.footer-copyright {
  font-size: 0.88rem;
  color: #94A3B8;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.footer-copyright .subtext {
  font-size: 0.78rem;
  color: #64748B;
}

/* ==========================================================================
   Sub-pages & Blog Post Inner Styles
   ========================================================================== */
.article-header {
  padding: 50px 0 30px;
  text-align: center;
}

.article-header h1 {
  font-size: 2.4rem;
  margin-bottom: 16px;
}

.article-meta {
  color: var(--text-muted);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.article-content {
  background: var(--bg-cream-card);
  border-radius: var(--radius-card);
  padding: 48px;
  box-shadow: var(--shadow-soft);
  max-width: 860px;
  margin: 0 auto 60px;
  font-size: 1.05rem;
  line-height: 1.8;
  color: #334155;
}

.article-content h2 {
  font-size: 1.6rem;
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--orange-light);
  color: var(--text-main);
}

.article-content h3 {
  font-size: 1.3rem;
  margin: 24px 0 12px;
}

.article-content p {
  margin-bottom: 18px;
}

.article-content ul, .article-content ol {
  margin-bottom: 22px;
  padding-left: 28px;
}

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

.article-content blockquote {
  border-left: 4px solid var(--coral-primary);
  background-color: var(--bg-cream-subtle);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  font-style: italic;
  color: #4A5568;
}

.article-content a {
  color: var(--coral-primary);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.article-content a:hover {
  color: #D9480F;
}

/* Post list grid on insights page */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-bottom: 60px;
}

.article-card {
  background: var(--bg-cream-card);
  border-radius: var(--radius-card);
  padding: 32px;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(255, 230, 204, 0.7);
  display: flex;
  flex-direction: column;
  transition: var(--transition-fast);
}

.article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
}

.article-tag {
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: var(--pastel-peach);
  color: #D9480F;
  margin-bottom: 14px;
}

.article-card h2 {
  font-size: 1.28rem;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.35;
}

.article-card p {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-light);
  border-top: 1px solid #F1F5F9;
  padding-top: 16px;
}

/* ==========================================================================
   Responsive Media Queries (@media)
   Strictly optimized for single column display on mobile & touch targets
   ========================================================================== */
@media (max-width: 1024px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

@media (max-width: 768px) {
  .nav-container {
    height: auto;
    padding: 16px 0;
    flex-wrap: wrap;
    gap: 14px;
    justify-content: center;
  }
  
  .main-nav {
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 14px;
  }
  
  .hero-title {
    font-size: 2.2rem;
  }
  
  .hero-subtitle {
    font-size: 1.15rem;
  }
  
  .hero-stats-banner {
    flex-direction: column;
    gap: 18px;
    padding: 20px;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-cta-group .btn {
    width: 100%;
    min-height: 52px;
    font-size: 1.05rem;
  }

  .features-grid,
  .unlock-grid,
  .pricing-grid,
  .testimonials-grid,
  .articles-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .pricing-card.popular {
    transform: none;
  }
  
  .footer-links-strict {
    gap: 14px;
    flex-direction: column;
  }
  
  .footer-strict-link {
    width: 80%;
    text-align: center;
  }
  
  .article-content {
    padding: 24px 18px;
  }
}