/* FSCloud - Swiss International Style (极简瑞士国际主义风格) */
:root {
  --bg-color: #FFFFFF;
  --text-main: #111111;
  --text-muted: #666666;
  --line-color: #E5E5E5;
  --accent-red: #E63946;
  --font-main: 'Inter Tight', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: 'IBM Plex Mono', Menlo, Monaco, Consolas, "Courier New", monospace;
  --container-max: 1240px;
}

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

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

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

/* 12-Column Grid System & Layout */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

/* Typography & Badges */
.mono-label {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
  display: inline-block;
  margin-bottom: 12px;
}

.section-divider {
  border: none;
  border-top: 1px solid var(--line-color);
  margin: 0;
}

/* Header & Navigation */
header.site-header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line-color);
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  font-family: var(--font-main);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  text-decoration: none;
  letter-spacing: -0.03em;
}

.brand-logo span {
  color: var(--accent-red);
}

nav.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

nav.main-nav a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-main);
  text-decoration: none;
  transition: color 0.15s ease;
}

nav.main-nav a:hover {
  color: var(--accent-red);
}

.nav-cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 20px;
  background-color: var(--accent-red);
  color: #FFFFFF !important;
  border-radius: 9999px; /* Pill button */
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  transition: opacity 0.15s ease;
}

.nav-cta-btn:hover {
  opacity: 0.9;
}

/* Hero Section */
.hero-section {
  padding: 100px 0 80px 0;
  border-bottom: 1px solid var(--line-color);
}

.hero-content {
  grid-column: span 12;
}

.hero-title {
  font-size: clamp(2.5rem, 6.5vw, 5.25rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin: 16px 0 28px 0;
  color: var(--text-main);
  max-width: 1000px;
}

.hero-desc {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 780px;
  line-height: 1.6;
  margin-bottom: 40px;
}

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

/* Pill CTA Buttons */
.btn-pill-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  background-color: var(--accent-red);
  color: #FFFFFF;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  border-radius: 9999px;
  transition: transform 0.15s ease, opacity 0.15s ease;
}

.btn-pill-primary:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

.btn-pill-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 30px;
  background-color: transparent;
  color: var(--text-main);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  border: 1px solid var(--text-main);
  border-radius: 9999px;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.btn-pill-secondary:hover {
  background-color: var(--text-main);
  color: #FFFFFF;
}

/* Sections Global */
.page-section {
  padding: 80px 0;
  border-bottom: 1px solid var(--line-color);
}

.section-header {
  grid-column: span 12;
  margin-bottom: 48px;
}

.section-number {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--accent-red);
  font-weight: 600;
  margin-bottom: 8px;
}

.section-heading {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-main);
}

/* 01 Features: 3 Cards */
.feature-card {
  grid-column: span 4;
  border-top: 1px solid var(--text-main);
  padding-top: 24px;
}

.feature-index {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* 02 Streaming & AI Support */
.media-ai-card {
  grid-column: span 6;
  border: 1px solid var(--line-color);
  padding: 36px;
  background: #FFFFFF;
}

.media-ai-card h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.media-ai-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 24px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-item {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  padding: 6px 14px;
  background-color: #F8F9FA;
  border: 1px solid var(--line-color);
  color: var(--text-main);
}

/* 03 Pricing Comparison Table */
.pricing-grid {
  grid-column: span 12;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.pricing-card {
  border: 1px solid var(--line-color);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: #FFFFFF;
  position: relative;
}

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

.pricing-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--accent-red);
  color: #FFFFFF;
  padding: 3px 8px;
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.plan-price {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 6px;
  letter-spacing: -0.03em;
}

.plan-price span {
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--text-muted);
}

.plan-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line-color);
}

.plan-features {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
}

.plan-features li {
  font-size: 0.9rem;
  color: var(--text-main);
  padding: 8px 0;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px dashed #F0F0F0;
}

.plan-features li::before {
  content: "+";
  color: var(--accent-red);
  font-family: var(--font-mono);
  font-weight: 700;
}

.plan-btn {
  display: block;
  text-align: center;
  padding: 12px;
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 9999px;
  transition: all 0.15s ease;
}

.plan-btn-red {
  background-color: var(--accent-red);
  color: #FFFFFF;
}

.plan-btn-red:hover {
  opacity: 0.92;
}

.plan-btn-outline {
  border: 1px solid var(--text-main);
  color: var(--text-main);
}

.plan-btn-outline:hover {
  background-color: var(--text-main);
  color: #FFFFFF;
}

/* 04 Reviews */
.review-card {
  grid-column: span 4;
  border: 1px solid var(--line-color);
  padding: 28px;
  background: #FFFFFF;
}

.review-stars {
  color: var(--accent-red);
  font-size: 1rem;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.review-quote {
  font-size: 0.9375rem;
  color: var(--text-main);
  line-height: 1.6;
  margin-bottom: 18px;
}

.review-author {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
  border-top: 1px solid var(--line-color);
  padding-top: 12px;
}

/* 05 FAQ */
.faq-list {
  grid-column: span 12;
}

.faq-item {
  border-bottom: 1px solid var(--line-color);
  padding: 24px 0;
}

.faq-question {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
  letter-spacing: -0.01em;
}

.faq-answer {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* Footer */
footer.site-footer {
  padding: 60px 0 40px 0;
  background-color: #FFFFFF;
  border-top: 1px solid var(--line-color);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line-color);
}

.footer-brand h4 {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 4px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer-nav {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
}

.footer-nav a {
  font-size: 0.9375rem;
  color: var(--text-main);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.15s ease;
}

.footer-nav a:hover {
  color: var(--accent-red);
}

.footer-bottom {
  padding-top: 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 12px;
}

/* Sub-page Article Styles (for recommendation, about, terms, privacy) */
.page-hero {
  padding: 60px 0 40px 0;
  border-bottom: 1px solid var(--line-color);
}

.page-hero h1 {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.page-hero p {
  font-size: 1.125rem;
  color: var(--text-muted);
}

.article-list {
  padding: 60px 0;
}

.article-item {
  border-bottom: 1px solid var(--line-color);
  padding: 32px 0;
}

.article-meta {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.article-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.35;
}

.article-title a {
  color: var(--text-main);
  text-decoration: none;
  transition: color 0.15s ease;
}

.article-title a:hover {
  color: var(--accent-red);
}

.article-summary {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 16px;
}

.article-body-content {
  font-size: 1rem;
  line-height: 1.8;
  color: #333333;
  margin-top: 16px;
}

.article-body-content p {
  margin-bottom: 16px;
}

.article-body-content h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 24px 0 12px 0;
  color: var(--text-main);
}

.article-body-content a {
  color: var(--accent-red);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-body-content a:hover {
  opacity: 0.8;
}

/* Info & Policy Text Formatting */
.policy-section {
  padding: 60px 0;
}

.policy-block {
  margin-bottom: 40px;
}

.policy-block h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.policy-block p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: #444444;
  margin-bottom: 12px;
}

.policy-block ul {
  padding-left: 20px;
  color: #444444;
  line-height: 1.7;
}

/* Subtle scroll animation */
.reveal-item {
  animation: fadeIn 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive Queries */
@media (max-width: 992px) {
  .feature-card {
    grid-column: span 12;
  }
  .media-ai-card {
    grid-column: span 12;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .review-card {
    grid-column: span 12;
  }
}

@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    height: auto;
    padding: 16px 0;
    gap: 12px;
  }
  nav.main-nav {
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
  }
  .hero-title {
    font-size: 2.25rem;
  }
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .btn-pill-primary, .btn-pill-secondary {
    width: 100%;
    text-align: center;
    padding: 14px 20px;
  }
  .footer-top {
    flex-direction: column;
    align-items: flex-start;
  }
  .footer-nav {
    flex-direction: column;
    gap: 12px;
  }
}