/* 奈云 (Naiyun) - 极简黑金高质感通用样式表 */
:root {
  --bg-deep: #08090C;
  --bg-surface: #10121A;
  --bg-card: rgba(20, 23, 34, 0.75);
  --bg-card-hover: rgba(30, 34, 50, 0.9);
  
  --gold-primary: #D4AF37;
  --gold-light: #F5E5C0;
  --gold-dark: #9A7B1C;
  --gold-gradient: linear-gradient(135deg, #FFE082 0%, #D4AF37 50%, #9A7B1C 100%);
  --gold-gradient-subtle: linear-gradient(135deg, rgba(255, 224, 130, 0.15) 0%, rgba(212, 175, 55, 0.08) 100%);
  --gold-glow: 0 10px 30px -5px rgba(212, 175, 55, 0.35);

  --text-primary: #FFFFFF;
  --text-secondary: #9DA4B4;
  --text-muted: #646C7E;
  
  --border-gold: rgba(212, 175, 55, 0.22);
  --border-gold-strong: rgba(255, 224, 130, 0.55);
  --border-subtle: rgba(255, 255, 255, 0.08);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  --max-width: 1200px;
  --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Reset & Global */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 0%, rgba(212, 175, 55, 0.08) 0%, transparent 50%),
              radial-gradient(circle at 80% 40%, rgba(154, 123, 28, 0.05) 0%, transparent 40%),
              var(--bg-deep);
  min-height: 100vh;
}

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

ul {
  list-style: none;
}

/* Typography Helpers */
.text-gradient-gold {
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

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

.section {
  padding: 100px 0;
  position: relative;
}

.section-title-wrap {
  text-align: center;
  max-width: 750px;
  margin: 0 auto 60px auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--gold-gradient-subtle);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-full);
  color: var(--gold-light);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
}

/* Button Component */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: var(--radius-full);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
  min-height: 48px;
}

.btn-gold {
  background: var(--gold-gradient);
  color: #08090C;
  box-shadow: var(--gold-glow);
}

.btn-gold:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 35px -5px rgba(212, 175, 55, 0.6);
  filter: brightness(1.1);
}

.btn-outline-gold {
  background: rgba(212, 175, 55, 0.05);
  color: var(--gold-light);
  border-color: var(--border-gold);
}

.btn-outline-gold:hover {
  background: rgba(212, 175, 55, 0.15);
  border-color: var(--border-gold-strong);
  color: #FFFFFF;
  transform: translateY(-3px);
}

.btn-lg {
  padding: 16px 40px;
  font-size: 1.1rem;
}

/* Header & Nav */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(8, 9, 12, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  height: 80px;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.logo-badge {
  width: 38px;
  height: 38px;
  background: var(--gold-gradient);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #08090C;
  font-weight: 900;
  font-size: 1.2rem;
  box-shadow: var(--gold-glow);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}

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

.nav-link:hover {
  color: var(--gold-light);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Hero Section */
.hero {
  padding-top: 170px;
  padding-bottom: 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: 15%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 350px;
  background: radial-gradient(circle, rgba(212, 175, 55, 0.18) 0%, transparent 70%);
  filter: blur(60px);
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(212, 175, 55, 0.1);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-full);
  color: var(--gold-light);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 3.8rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 800px;
  margin: 0 auto 40px auto;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 60px;
}

/* Stats Bar */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(10px);
}

.stat-item {
  text-align: center;
  position: relative;
}

.stat-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: 0;
  top: 20%;
  height: 60%;
  width: 1px;
  background: var(--border-subtle);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--gold-light);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Core Advantages */
.grid-2x2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-md);
  padding: 36px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-gold-strong);
  transform: translateY(-5px);
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.7), 0 0 30px -10px rgba(212, 175, 55, 0.2);
}

.card-icon {
  width: 60px;
  height: 60px;
  background: var(--gold-gradient-subtle);
  border: 1px solid var(--border-gold);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 20px;
}

.card-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.card-desc {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.6;
}

/* Streaming & AI Support */
.media-ai-box {
  background: linear-gradient(180deg, rgba(20, 23, 34, 0.9) 0%, rgba(10, 11, 15, 0.95) 100%);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-lg);
  padding: 48px;
  position: relative;
}

.category-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  margin-top: 32px;
}

.tag-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-weight: 600;
  color: var(--text-primary);
  transition: var(--transition);
}

.tag-item:hover {
  border-color: var(--border-gold);
  background: var(--gold-gradient-subtle);
  color: var(--gold-light);
  transform: translateY(-2px);
}

.tag-badge {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 10px;
  background: var(--gold-gradient);
  color: #08090C;
  font-weight: 800;
}

/* Pricing Section */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  position: relative;
}

.pricing-card.featured {
  background: linear-gradient(180deg, rgba(30, 35, 55, 0.95) 0%, rgba(18, 20, 30, 0.95) 100%);
  border: 2px solid var(--gold-primary);
  box-shadow: 0 10px 40px -10px rgba(212, 175, 55, 0.3);
  transform: scale(1.04);
  z-index: 2;
}

.popular-ribbon {
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gold-gradient);
  color: #08090C;
  font-size: 0.82rem;
  font-weight: 800;
  padding: 6px 22px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  white-space: nowrap;
  box-shadow: 0 6px 20px rgba(212, 175, 55, 0.45), inset 0 1px 1px rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.4);
  display: flex;
  align-items: center;
  gap: 6px;
  z-index: 10;
}

.plan-name {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  min-height: 40px;
}

.plan-price {
  font-size: 2.4rem;
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 24px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.plan-price.featured-price {
  color: var(--gold-light);
}

.plan-price span {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--text-secondary);
}

.plan-features {
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.plan-features li::before {
  content: "✓";
  color: var(--gold-primary);
  font-weight: bold;
}

/* User Reviews */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: var(--transition);
}

.review-card:hover {
  border-color: var(--border-gold);
  transform: translateY(-4px);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gold-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #08090C;
  font-weight: 800;
  font-size: 1.1rem;
}

.reviewer-name {
  font-size: 1rem;
  font-weight: 700;
}

.reviewer-role {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.rating-stars {
  color: #FFD700;
  margin-bottom: 12px;
  font-size: 0.9rem;
}

.review-text {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* FAQ Accordion (Pure CSS) */
.faq-list {
  max-width: 850px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item[open] {
  border-color: var(--border-gold);
  background: var(--bg-card-hover);
}

.faq-summary {
  padding: 20px 24px;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
  color: var(--text-primary);
}

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

.faq-summary::after {
  content: "+";
  font-size: 1.5rem;
  color: var(--gold-primary);
  transition: transform 0.3s ease;
}

.faq-item[open] .faq-summary::after {
  content: "−";
}

.faq-content {
  padding: 0 24px 24px 24px;
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.7;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 4px;
  padding-top: 16px;
}

/* Footer Strict Layout - Only 4 Headings as requested */
.footer {
  background: #050608;
  border-top: 1px solid var(--border-gold);
  padding: 60px 0 40px 0;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.footer-nav-link {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--gold-light);
  transition: var(--transition);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
}

.footer-nav-link:hover {
  color: #FFFFFF;
  border-color: var(--border-gold);
  background: var(--gold-gradient-subtle);
}

.footer-bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Subpage Specific Layouts */
.subpage-hero {
  padding-top: 150px;
  padding-bottom: 40px;
  text-align: center;
}

.subpage-content {
  background: var(--bg-card);
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-lg);
  padding: 48px;
  margin-bottom: 80px;
}

.subpage-content h2 {
  font-size: 1.6rem;
  color: var(--gold-light);
  margin: 32px 0 16px 0;
}

.subpage-content h2:first-child {
  margin-top: 0;
}

.subpage-content p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

.subpage-content ul {
  margin-bottom: 24px;
  padding-left: 20px;
}

.subpage-content li {
  color: var(--text-secondary);
  line-height: 1.8;
  list-style: disc;
  margin-bottom: 8px;
}

/* Responsive Media Queries (@media) */
@media (max-width: 1024px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured {
    transform: none;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }
  .stat-item:nth-child(2)::after {
    display: none;
  }
  .reviews-grid {
    grid-template-columns: repeat(1, 1fr);
  }
}

@media (max-width: 768px) {
  .header {
    height: 70px;
  }
  .nav-links {
    display: none; /* Keep clean & focused for mobile */
  }
  .hero {
    padding-top: 130px;
    padding-bottom: 60px;
  }
  .hero-title {
    font-size: 2.4rem;
  }
  .hero-subtitle {
    font-size: 1rem;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .section {
    padding: 60px 0;
  }
  .section-title {
    font-size: 1.8rem;
  }
  .grid-2x2 {
    grid-template-columns: 1fr;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .stat-item::after {
    display: none !important;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .footer-nav {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
  .subpage-content {
    padding: 24px;
  }
}