/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Noto Sans SC', 'Inter', system-ui, sans-serif;
  background: #0a0e1a;
  color: #e2e8f0;
  line-height: 1.7;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
details { cursor: pointer; }

/* ===== DESIGN TOKENS ===== */
:root {
  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-dark: #4f46e5;
  --accent: #22d3ee;
  --accent2: #f472b6;
  --surface: rgba(255,255,255,0.04);
  --surface-hover: rgba(255,255,255,0.08);
  --border: rgba(255,255,255,0.08);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --bg: #0a0e1a;
  --bg2: #0f1528;
  --radius: 16px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(99,102,241,0.15);
  --shadow-lg: 0 8px 48px rgba(99,102,241,0.25);
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
}

/* ===== UTILITY ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: 0 4px 20px rgba(99,102,241,0.4);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(99,102,241,0.6);
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
}
.btn-secondary {
  background: var(--surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
  backdrop-filter: blur(8px);
}
.btn-secondary:hover {
  background: var(--surface-hover);
  border-color: var(--primary-light);
  transform: translateY(-2px);
}
.btn-large { padding: 18px 40px; font-size: 1.1rem; }

/* ===== HEADER ===== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(10,14,26,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: all var(--transition);
}
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 70px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  transition: opacity var(--transition);
}
.logo:hover { opacity: 0.8; }
.logo-icon {
  font-size: 1.5rem;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.logo-text em { color: var(--primary-light); font-style: normal; }
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition);
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 2px;
  background: var(--primary);
  transform: scaleX(0);
  transition: transform var(--transition);
}
.nav-links a:hover { color: var(--text-primary); }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-cta {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark)) !important;
  color: #fff !important;
  padding: 8px 20px;
  border-radius: 50px;
  font-weight: 600 !important;
}
.nav-cta::after { display: none !important; }
.nav-cta:hover { opacity: 0.9; transform: translateY(-1px); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 4px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: all var(--transition); }

/* ===== HERO ===== */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 120px 0 80px;
}
.hero-bg-orbs { position: absolute; inset: 0; pointer-events: none; }
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  animation: float 8s ease-in-out infinite;
}
.orb-1 { width: 500px; height: 500px; background: var(--primary); top: -100px; left: -150px; animation-delay: 0s; }
.orb-2 { width: 400px; height: 400px; background: var(--accent); top: 200px; right: -100px; animation-delay: -3s; }
.orb-3 { width: 300px; height: 300px; background: var(--accent2); bottom: -50px; left: 40%; animation-delay: -6s; }
.orb-4 { width: 600px; height: 600px; background: var(--primary); top: -200px; left: -200px; animation-delay: -2s; }
.orb-5 { width: 400px; height: 400px; background: var(--accent); bottom: -100px; right: -100px; animation-delay: -4s; }
@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-30px) scale(1.05); }
}
.hero-content { position: relative; z-index: 1; text-align: center; max-width: 900px; margin: 0 auto; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(99,102,241,0.15);
  border: 1px solid rgba(99,102,241,0.3);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--primary-light);
  margin-bottom: 24px;
  font-weight: 500;
}
.badge-dot {
  width: 8px; height: 8px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}
.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #fff 0%, #c7d2fe 50%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.title-highlight {
  display: block;
  font-size: clamp(1.5rem, 3.5vw, 2.5rem);
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
  margin-top: 8px;
  letter-spacing: 0.05em;
}
.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto 40px;
  line-height: 1.8;
}
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.stat-item { text-align: center; }
.stat-num {
  display: block;
  font-size: 2.2rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}
.stat-label { font-size: 0.85rem; color: var(--text-muted); font-weight: 500; }
.hero-cta-group { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s ease-in-out infinite;
}
.scroll-arrow { font-size: 1.5rem; color: var(--text-muted); }
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(-10px); }
}

/* ===== SECTION COMMON ===== */
.section-header { text-align: center; margin-bottom: 56px; }
.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 800;
  background: linear-gradient(135deg, #fff, #c7d2fe);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}
.section-subtitle { font-size: 1.05rem; color: var(--text-secondary); }

/* ===== FEATURES ===== */
.features-section {
  padding: 100px 0;
  background: var(--bg2);
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}
.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.feature-card:hover { transform: translateY(-6px); border-color: rgba(99,102,241,0.3); background: var(--surface-hover); box-shadow: var(--shadow); }
.feature-card:hover::before { transform: scaleX(1); }
.feature-icon { font-size: 2.5rem; margin-bottom: 16px; }
.feature-card h3 { font-size: 1.15rem; font-weight: 700; color: var(--text-primary); margin-bottom: 10px; }
.feature-card p { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.7; }
.features-cta { text-align: center; }

/* ===== ARTICLES ===== */
.articles-section {
  padding: 100px 0;
  background: var(--bg);
}
.articles-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}
.article-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}
.article-card:hover {
  border-color: rgba(99,102,241,0.3);
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}
.article-featured { grid-column: span 12; background: linear-gradient(135deg, rgba(99,102,241,0.08), rgba(34,211,238,0.04)); border-color: rgba(99,102,241,0.2); }
.article-card:nth-child(2),
.article-card:nth-child(3) { grid-column: span 6; }
.article-card:nth-child(4),
.article-card:nth-child(5),
.article-card:nth-child(6) { grid-column: span 4; }
.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.article-tag {
  padding: 3px 10px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.tag-guide { background: rgba(99,102,241,0.2); color: var(--primary-light); }
.tag-speed { background: rgba(34,211,238,0.2); color: var(--accent); }
.tag-streaming { background: rgba(244,114,182,0.2); color: var(--accent2); }
.tag-compare { background: rgba(250,204,21,0.2); color: #fbbf24; }
.tag-security { background: rgba(52,211,153,0.2); color: #34d399; }
.tag-game { background: rgba(251,146,60,0.2); color: #fb923c; }
.article-date { font-size: 0.82rem; color: var(--text-muted); }
.article-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.4;
}
.article-featured .article-title { font-size: 1.5rem; }
.article-body { flex: 1; margin-bottom: 20px; }
.article-body p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 12px;
}
.article-body h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary-light);
  margin: 20px 0 8px;
}
.article-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--primary-light);
  font-size: 0.9rem;
  font-weight: 600;
  transition: all var(--transition);
  margin-top: auto;
}
.article-link:hover { color: var(--accent); gap: 10px; }

/* ===== REVIEWS ===== */
.reviews-section {
  padding: 100px 0;
  background: var(--bg2);
}
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
  position: relative;
}
.review-card::before {
  content: '\201C';
  position: absolute;
  top: 16px; right: 24px;
  font-size: 5rem;
  color: rgba(99,102,241,0.1);
  font-family: Georgia, serif;
  line-height: 1;
}
.review-card:hover { transform: translateY(-4px); border-color: rgba(99,102,241,0.25); box-shadow: var(--shadow); }
.review-header { display: flex; align-items: center; gap: 14px; margin-bottom: 20px; }
.reviewer-avatar {
  width: 48px; height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  color: #fff;
  flex-shrink: 0;
}
.reviewer-info { flex: 1; }
.reviewer-name { display: block; font-weight: 700; color: var(--text-primary); font-size: 1rem; }
.reviewer-role { font-size: 0.82rem; color: var(--text-muted); }
.review-rating { color: #fbbf24; letter-spacing: 2px; font-size: 0.95rem; }
.review-content p { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.8; font-style: italic; }
.review-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.review-tag {
  background: rgba(99,102,241,0.12);
  border: 1px solid rgba(99,102,241,0.2);
  color: var(--primary-light);
  padding: 3px 10px;
  border-radius: 50px;
  font-size: 0.78rem;
  font-weight: 500;
}

/* ===== FAQ ===== */
.faq-section {
  padding: 100px 0;
  background: var(--bg);
}
.faq-list { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item[open] { border-color: rgba(99,102,241,0.35); }
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 28px;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  gap: 16px;
  transition: background var(--transition);
}
.faq-question:hover { background: var(--surface-hover); }
.faq-item[open] .faq-question { color: var(--primary-light); }
.faq-icon {
  font-size: 1.4rem;
  color: var(--primary-light);
  transition: transform var(--transition);
  flex-shrink: 0;
  line-height: 1;
}
.faq-item[open] .faq-icon { transform: rotate(45deg); }
.faq-answer { padding: 0 28px 22px; }
.faq-answer p { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.8; }
details > summary { list-style: none; }
details > summary::-webkit-details-marker { display: none; }

/* ===== CTA BANNER ===== */
.cta-banner {
  position: relative;
  padding: 100px 0;
  background: linear-gradient(135deg, #0d1230, #0a0e1a);
  overflow: hidden;
  text-align: center;
}
.cta-bg-orbs { position: absolute; inset: 0; pointer-events: none; }
.cta-title {
  position: relative;
  font-size: clamp(1.8rem, 3.5vw, 3rem);
  font-weight: 900;
  background: linear-gradient(135deg, #fff, var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
  z-index: 1;
}
.cta-desc {
  position: relative;
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  z-index: 1;
}
.cta-actions { position: relative; z-index: 1; display: flex; flex-direction: column; align-items: center; gap: 20px; }
.cta-meta { display: flex; gap: 24px; flex-wrap: wrap; justify-content: center; }
.cta-meta span { font-size: 0.9rem; color: var(--text-secondary); font-weight: 500; }
.cta-meta span::before { content: ''; }

/* ===== FOOTER ===== */
.site-footer {
  background: #080b16;
  padding: 64px 0 32px;
  border-top: 1px solid var(--border);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1.5fr 1.5fr;
  gap: 40px;
  margin-bottom: 48px;
}
.footer-brand p { font-size: 0.9rem; color: var(--text-muted); margin-top: 16px; line-height: 1.7; }
.footer-nav h3, .footer-articles h3, .footer-cta-col h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 16px;
}
.footer-nav ul li, .footer-articles ul li { margin-bottom: 10px; }
.footer-nav a, .footer-articles a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}
.footer-nav a:hover, .footer-articles a:hover { color: var(--primary-light); }
.footer-cta-col .btn { width: 100%; justify-content: center; margin-bottom: 12px; }
.footer-note { font-size: 0.8rem; color: var(--text-muted); text-align: center; }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  text-align: center;
}
.footer-bottom p { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 6px; }
.footer-bottom a { color: var(--primary-light); }
.footer-disclaimer { font-size: 0.78rem !important; opacity: 0.7; }

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .article-card:nth-child(2),
  .article-card:nth-child(3),
  .article-card:nth-child(4),
  .article-card:nth-child(5),
  .article-card:nth-child(6) { grid-column: span 12; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 70px; left: 0; right: 0;
    background: rgba(10,14,26,0.97);
    backdrop-filter: blur(20px);
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border);
  }
  .nav-toggle { display: flex; }
  .hero-stats { gap: 28px; }
  .hero-cta-group { flex-direction: column; align-items: center; }
  .features-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .articles-grid { grid-template-columns: 1fr; }
  .article-featured, .article-card { grid-column: span 12 !important; }
  .cta-meta { gap: 12px; }
}
@media (max-width: 480px) {
  .stat-num { font-size: 1.8rem; }
  .faq-question { padding: 18px 20px; font-size: 0.92rem; }
  .faq-answer { padding: 0 20px 18px; }
  .review-card { padding: 24px; }
  .feature-card { padding: 24px; }
  .article-card { padding: 24px; }
}
/* ===== PRICING ===== */
.pricing-section {
  padding: 100px 0;
  background: var(--bg2);
}
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
  margin-bottom: 40px;
}
.pricing-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  transition: all var(--transition);
}
.pricing-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0;
  transition: opacity var(--transition);
}
.pricing-card:hover {
  transform: translateY(-8px);
  border-color: rgba(99,102,241,0.4);
  box-shadow: var(--shadow-lg);
}
.pricing-card:hover::before { opacity: 1; }
.pricing-card.featured {
  border-color: rgba(99,102,241,0.45);
  background: linear-gradient(135deg, rgba(99,102,241,0.12), rgba(34,211,238,0.05));
  box-shadow: var(--shadow);
}
.pricing-card.featured::before { opacity: 1; }
.pricing-badge {
  position: absolute;
  top: 18px; right: -28px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 36px;
  transform: rotate(40deg);
  letter-spacing: 0.08em;
}
.pricing-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 8px;
}
.pricing-name {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.2;
}
.pricing-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}
.pricing-meta {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.pricing-amount {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  margin-bottom: 4px;
}
.pricing-currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary-light);
  line-height: 1.4;
}
.pricing-number {
  font-size: 3rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}
.pricing-period {
  font-size: 1rem;
  color: var(--text-muted);
  padding-bottom: 4px;
}
.pricing-traffic {
  display: flex;
  gap: 24px;
  padding: 16px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin: 20px 0;
}
.pricing-traffic-item { flex: 1; }
.pricing-traffic-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.pricing-traffic-value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}
.pricing-discount {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}
.discount-tag {
  background: rgba(99,102,241,0.12);
  border: 1px solid rgba(99,102,241,0.25);
  color: var(--primary-light);
  padding: 3px 10px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
}
.pricing-features { list-style: none; margin-bottom: 28px; flex: 1; }
.pricing-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding: 6px 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  line-height: 1.5;
}
.pricing-features li:last-child { border-bottom: none; }
.pricing-features .check {
  color: #34d399;
  font-size: 1rem;
  flex-shrink: 0;
  margin-top: 1px;
}
.pricing-cta {
  display: block;
  text-align: center;
  padding: 14px;
  border-radius: 50px;
  font-weight: 700;
  font-size: 0.95rem;
  transition: all var(--transition);
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: 0 4px 16px rgba(99,102,241,0.35);
  margin-top: auto;
}
.pricing-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(99,102,241,0.55);
}
.pricing-note {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 12px;
}
@media(max-width:768px){
  .pricing-grid { grid-template-columns: 1fr; }
}

/* ===== ARTICLES TOOLBAR & CONTROLS ===== */
.articles-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 20px;
  padding: 12px 20px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 50px;
  backdrop-filter: blur(10px);
}
.articles-hint {
  font-size: 0.88rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}
.articles-controls {
  display: flex;
  gap: 10px;
}
.articles-ctrl-btn {
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: var(--primary-light);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: inherit;
}
.articles-ctrl-btn:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-1px);
}

/* ===== ARTICLE CARD & INTERACTION ===== */
.article-card {
  position: relative;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
}
.article-card:hover {
  border-color: rgba(99, 102, 241, 0.4);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
  transform: translateY(-3px);
}
.article-card.expanded {
  border-color: rgba(99, 102, 241, 0.6);
  background: linear-gradient(180deg, rgba(26, 34, 64, 0.95), rgba(15, 23, 42, 0.98));
  box-shadow: 0 16px 40px rgba(99, 102, 241, 0.18);
  transform: none;
}
.article-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text-primary);
  margin: 12px 0 14px;
  transition: color 0.2s ease;
}
.article-card:hover .article-title,
.article-title:hover {
  color: var(--primary-light);
}

/* 摘要与未展开卡片底部 */
.article-summary-box {
  margin-top: 10px;
}
.article-excerpt {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin: 0 0 16px;
}
.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.article-read-time {
  font-size: 0.8rem;
  color: var(--text-muted);
}
.article-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.35);
  color: var(--primary-light);
  font-size: 0.86rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.25s ease;
  font-family: inherit;
}
.article-toggle-btn:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.4);
}
.article-toggle-btn .toggle-icon {
  display: inline-block;
  transition: transform 0.35s ease;
  font-style: normal;
  font-size: 0.9rem;
}
.article-card.expanded .article-toggle-btn {
  background: rgba(239, 68, 68, 0.12);
  border-color: rgba(239, 68, 68, 0.35);
  color: #f87171;
}
.article-card.expanded .article-toggle-btn:hover {
  background: #ef4444;
  color: #fff;
}
.article-card.expanded .article-toggle-btn .toggle-icon {
  transform: rotate(180deg);
}

/* ===== 核心文章内容展开/折叠 ===== */
.article-body {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1),
              opacity 0.4s ease,
              margin 0.4s ease,
              padding 0.4s ease;
  margin-top: 0;
  padding-top: 0;
}
.article-card.expanded .article-body {
  max-height: 8000px; /* 大容量 fallback，确保完整展开 */
  opacity: 1;
  margin-top: 20px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

/* 展开后的正文排版美化 */
.article-body h4 {
  font-size: 1.12rem;
  font-weight: 700;
  color: #fff;
  margin: 28px 0 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.article-body h4::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 16px;
  background: linear-gradient(180deg, var(--primary), var(--accent));
  border-radius: 2px;
}
.article-body p {
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--text-secondary);
  margin-bottom: 14px;
}
.article-body strong {
  color: #fff;
  font-weight: 600;
}
.article-body code {
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.88em;
  font-family: Consolas, Monaco, monospace;
}

/* 展开后底部的收起与行动按钮 */
.article-body-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  flex-wrap: wrap;
}
.article-collapse-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-secondary);
  font-size: 0.86rem;
  padding: 8px 20px;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: inherit;
}
.article-collapse-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.3);
}
.article-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  font-size: 0.92rem;
  font-weight: 700;
  padding: 10px 24px;
  border-radius: 50px;
  text-decoration: none;
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.35);
  transition: all 0.25s ease;
}
.article-cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(99, 102, 241, 0.55);
}
@media (max-width: 640px) {
  .articles-toolbar { flex-direction: column; align-items: flex-start; }
  .article-card-footer { flex-direction: column; align-items: flex-start; }
  .article-body-footer { flex-direction: column; width: 100%; }
  .article-body-footer .article-collapse-btn,
  .article-body-footer .article-cta-btn { width: 100%; justify-content: center; }
}