/* ==========================================================================
   Swiss Minimalist Style Sheet - 灯塔cloud (Lighthouse Cloud)
   Palette: Background #FAFAFA | Text #0A0A0A | Accent #FF4500 | Border #E5E5E5 & #0A0A0A
   Zero radius, zero gradients, zero shadows - pure typography and hairlines.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;700;900&display=swap');

:root {
  --bg-color: #FAFAFA;
  --text-color: #0A0A0A;
  --accent-color: #FF4500;
  --border-light: #E5E5E5;
  --border-dark: #0A0A0A;
  --muted-text: #666666;
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --spacing-section: 120px;
  --container-max: 1280px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  border-radius: 0 !important;
  box-shadow: none !important;
}

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

body {
  line-height: 1.6;
  overflow-x: hidden;
  background-color: var(--bg-color);
  color: var(--text-color);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
}

/* Hairline utilities */
.border-top-hairline { border-top: 1px solid var(--border-light); }
.border-bottom-hairline { border-bottom: 1px solid var(--border-light); }
.border-top-dark { border-top: 1px solid var(--border-dark); }
.border-bottom-dark { border-bottom: 1px solid var(--border-dark); }

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 32px;
}

/* Header & Sticky Top Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-color);
  border-bottom: 1px solid var(--border-dark);
}

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

.logo-block {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 18px;
  font-weight: 900;
  letter-spacing: -0.04em;
  text-transform: uppercase;
}

.logo-dot {
  width: 10px;
  height: 10px;
  background-color: var(--accent-color);
  display: inline-block;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 40px;
  list-style: none;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
  position: relative;
  padding: 8px 0;
}

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

.nav-cta-btn {
  display: inline-block;
  padding: 12px 24px;
  border: 1px solid var(--border-dark);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background-color: transparent;
  color: var(--text-color);
}

.nav-cta-btn:hover {
  background-color: var(--text-color);
  color: var(--bg-color);
}

/* Hero Section */
.hero-section {
  padding-top: var(--spacing-section);
  padding-bottom: 80px;
  position: relative;
}

.hero-meta {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--accent-color);
  text-transform: uppercase;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.hero-title {
  font-size: 110px;
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.05em;
  color: var(--text-color);
  text-transform: uppercase;
  margin-bottom: 32px;
  max-width: 1100px;
}

.hero-subtitle {
  font-size: 26px;
  font-weight: 300;
  font-style: italic;
  line-height: 1.4;
  color: var(--muted-text);
  margin-bottom: 40px;
  max-width: 820px;
}

.hero-description {
  font-size: 16px;
  font-weight: 400;
  line-height: 1.8;
  color: var(--text-color);
  max-width: 780px;
  margin-bottom: 48px;
  border-left: 2px solid var(--accent-color);
  padding-left: 24px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 18px 42px;
  background-color: var(--text-color);
  color: var(--bg-color);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.05em;
  border: 1px solid var(--text-color);
}

.btn-primary:hover {
  background-color: var(--accent-color);
  border-color: var(--accent-color);
  color: #FFFFFF;
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 18px 36px;
  background-color: transparent;
  color: var(--text-color);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.05em;
  border: 1px solid var(--border-dark);
}

.btn-secondary:hover {
  background-color: var(--text-color);
  color: var(--bg-color);
}

/* Stat Row (4 Columns separated by hairline borders) */
.stats-section {
  border-top: 1px solid var(--border-dark);
  border-bottom: 1px solid var(--border-dark);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.stat-item {
  padding: 48px 32px;
  border-right: 1px solid var(--border-dark);
}

.stat-item:last-child {
  border-right: none;
}

.stat-number {
  font-size: 52px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--text-color);
  margin-bottom: 12px;
  display: block;
}

.stat-number span {
  color: var(--accent-color);
}

.stat-label {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted-text);
}

.stat-desc {
  font-size: 14px;
  color: var(--text-color);
  margin-top: 8px;
  line-height: 1.5;
}

/* Section Header Structure */
.section-wrapper {
  padding: var(--spacing-section) 0;
  border-bottom: 1px solid var(--border-light);
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 64px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-dark);
}

.section-tag {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.25em;
  color: var(--accent-color);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-heading {
  font-size: 44px;
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--text-color);
}

.section-note {
  font-size: 14px;
  font-weight: 400;
  color: var(--muted-text);
  max-width: 380px;
  text-align: right;
  line-height: 1.6;
}

/* Feature 3x2 Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--border-dark);
  border-left: 1px solid var(--border-dark);
}

.feature-cell {
  padding: 48px 36px;
  border-right: 1px solid var(--border-dark);
  border-bottom: 1px solid var(--border-dark);
  position: relative;
  background-color: var(--bg-color);
  transition: background-color 0.2s ease;
}

.feature-cell:hover {
  background-color: #F0F0F0;
}

.feature-num {
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.15em;
  color: var(--accent-color);
  margin-bottom: 24px;
  display: block;
}

.feature-title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  color: var(--text-color);
}

.feature-text {
  font-size: 15px;
  font-weight: 400;
  line-height: 1.7;
  color: var(--muted-text);
}

/* Streaming & AI Cards */
.media-ai-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.media-ai-card {
  border: 1px solid var(--border-dark);
  padding: 48px;
  background-color: #FFFFFF;
}

.card-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 4px 10px;
  background-color: var(--text-color);
  color: var(--bg-color);
  margin-bottom: 24px;
}

.card-title {
  font-size: 28px;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.card-desc {
  font-size: 15px;
  color: var(--muted-text);
  line-height: 1.7;
  margin-bottom: 32px;
}

.app-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  border-top: 1px solid var(--border-light);
  padding-top: 24px;
}

.app-tag {
  font-size: 13px;
  font-weight: 700;
  padding: 6px 14px;
  border: 1px solid var(--border-dark);
  color: var(--text-color);
}

/* Pricing Section */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.pricing-card {
  border: 1px solid var(--border-dark);
  padding: 48px 36px;
  background-color: #FFFFFF;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
}

.pricing-card.featured {
  border: 2px solid var(--accent-color);
}

.featured-flag {
  position: absolute;
  top: 0;
  right: 0;
  background-color: var(--accent-color);
  color: #FFFFFF;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 6px 14px;
}

.plan-name {
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.plan-sub {
  font-size: 13px;
  color: var(--muted-text);
  margin-bottom: 32px;
}

.plan-price-wrap {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-light);
}

.plan-currency {
  font-size: 20px;
  font-weight: 700;
  vertical-align: super;
}

.plan-price {
  font-size: 54px;
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1;
}

.plan-period {
  font-size: 14px;
  color: var(--muted-text);
}

.plan-features-list {
  list-style: none;
  margin-bottom: 40px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.plan-feature-item {
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-color);
}

.plan-check {
  color: var(--accent-color);
  font-weight: 900;
}

.plan-btn {
  display: block;
  width: 100%;
  text-align: center;
  padding: 16px 0;
  border: 1px solid var(--border-dark);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background-color: transparent;
  color: var(--text-color);
}

.pricing-card.featured .plan-btn {
  background-color: var(--accent-color);
  border-color: var(--accent-color);
  color: #FFFFFF;
}

.plan-btn:hover {
  background-color: var(--text-color);
  border-color: var(--text-color);
  color: var(--bg-color);
}

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

.review-card {
  border: 1px solid var(--border-dark);
  padding: 40px 32px;
  background-color: #FFFFFF;
}

.review-rating {
  color: var(--accent-color);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.review-quote {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-color);
  margin-bottom: 24px;
}

.review-author {
  font-size: 13px;
  font-weight: 700;
  border-top: 1px solid var(--border-light);
  padding-top: 16px;
  display: flex;
  justify-content: space-between;
  color: var(--muted-text);
}

/* FAQ Accordion / Minimal List */
.faq-list {
  border-top: 1px solid var(--border-dark);
}

.faq-item {
  border-bottom: 1px solid var(--border-dark);
  padding: 32px 0;
}

.faq-question {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.faq-question::before {
  content: "Q";
  color: var(--accent-color);
  font-weight: 900;
  margin-right: 16px;
}

.faq-answer {
  font-size: 15px;
  color: var(--muted-text);
  line-height: 1.8;
  padding-left: 32px;
  max-width: 900px;
}

/* Footer (4-column grid, exactly 4 titles) */
.site-footer {
  background-color: var(--bg-color);
  border-top: 1px solid var(--border-dark);
  padding: 80px 0 40px 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  margin-bottom: 64px;
}

.footer-col {
  display: flex;
  flex-direction: column;
}

.footer-col-title {
  font-size: 16px;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  color: var(--text-color);
  display: inline-block;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-dark);
}

.footer-col-desc {
  font-size: 13px;
  color: var(--muted-text);
  line-height: 1.7;
  margin-bottom: 16px;
}

.footer-btn-link {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent-color);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-btn-link:hover {
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid var(--border-light);
  padding-top: 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--muted-text);
}

/* Article Page & News Hub Styles */
.article-header {
  padding: 80px 0 40px 0;
  border-bottom: 1px solid var(--border-dark);
}

.article-meta {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent-color);
  margin-bottom: 20px;
  text-transform: uppercase;
}

.article-title {
  font-size: 48px;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  max-width: 900px;
}

.article-subtitle {
  font-size: 18px;
  color: var(--muted-text);
  line-height: 1.6;
  max-width: 800px;
}

.article-content {
  padding: 60px 0 100px 0;
  max-width: 860px;
}

.article-content h2 {
  font-size: 28px;
  font-weight: 900;
  margin: 48px 0 20px 0;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
}

.article-content h3 {
  font-size: 20px;
  font-weight: 700;
  margin: 32px 0 16px 0;
}

.article-content p {
  font-size: 16px;
  line-height: 1.85;
  margin-bottom: 24px;
  color: #1F1F1F;
}

.article-content ul, .article-content ol {
  margin: 20px 0 28px 28px;
  line-height: 1.85;
}

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

.article-content blockquote {
  border-left: 2px solid var(--accent-color);
  padding: 16px 24px;
  background-color: #F3F3F3;
  margin: 32px 0;
  font-size: 15px;
  color: var(--muted-text);
}

.article-content a {
  color: var(--accent-color);
  font-weight: 700;
  border-bottom: 1px solid var(--accent-color);
}

.article-content a:hover {
  background-color: #FFF0EB;
}

/* News List Hub Grid */
.news-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-top: 48px;
}

.news-card {
  border: 1px solid var(--border-dark);
  padding: 40px;
  background-color: #FFFFFF;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.15s ease;
}

.news-card:hover {
  transform: translateY(-2px);
}

.news-meta {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--accent-color);
  margin-bottom: 16px;
  text-transform: uppercase;
}

.news-title {
  font-size: 22px;
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 16px;
}

.news-summary {
  font-size: 14px;
  color: var(--muted-text);
  line-height: 1.7;
  margin-bottom: 24px;
}

.news-read-more {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-color);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.news-read-more:hover {
  color: var(--accent-color);
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 80px;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stat-item:nth-child(2) {
    border-right: none;
  }
  .stat-item:nth-child(1), .stat-item:nth-child(2) {
    border-bottom: 1px solid var(--border-dark);
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .media-ai-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --spacing-section: 64px;
  }
  .container {
    padding: 0 20px;
  }
  .nav-wrapper {
    height: 70px;
  }
  .nav-menu {
    gap: 16px;
  }
  .nav-link {
    font-size: 13px;
  }
  .nav-cta-btn {
    padding: 8px 14px;
    font-size: 12px;
  }
  .hero-title {
    font-size: 46px;
    line-height: 1.05;
  }
  .hero-subtitle {
    font-size: 18px;
  }
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .btn-primary, .btn-secondary {
    width: 100%;
    min-height: 48px;
    font-size: 14px;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .stat-item {
    border-right: none;
    border-bottom: 1px solid var(--border-dark);
    padding: 32px 20px;
  }
  .stat-item:last-child {
    border-bottom: none;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
  .section-note {
    text-align: left;
  }
  .section-heading {
    font-size: 32px;
  }
  .media-ai-card {
    padding: 32px 20px;
  }
  .pricing-card {
    padding: 36px 20px;
  }
  .news-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
  }
  .article-title {
    font-size: 32px;
  }
}