/* ========== Speed Lab Theme ========== */
:root {
  --blue: #0057FF;
  --blue-dark: #0040CC;
  --blue-light: #E8F0FF;
  --green: #00C853;
  --green-dark: #00A041;
  --gray-50: #F8F9FA;
  --gray-100: #F1F3F4;
  --gray-200: #E8EAED;
  --gray-400: #9AA0A6;
  --gray-600: #5F6368;
  --gray-800: #3C4043;
  --gray-900: #202124;
  --white: #FFFFFF;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 24px rgba(0,0,0,0.12);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.16);
  --transition: 0.2s ease;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--gray-900);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ========== NAV ========== */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  box-shadow: 0 1px 8px rgba(0,0,0,0.06);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 700;
  font-size: 18px;
  color: var(--gray-900);
}
.nav-logo svg { flex-shrink: 0; }
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}
.nav-links a {
  display: block;
  padding: 8px 16px;
  border-radius: 24px;
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-600);
  transition: background var(--transition), color var(--transition);
}
.nav-links a:hover { background: var(--gray-100); color: var(--gray-900); }
.nav-links a.active { background: var(--blue); color: var(--white); }
.nav-dl-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--blue);
  color: var(--white) !important;
  border-radius: 24px;
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}
.nav-dl-btn:hover { background: var(--blue-dark) !important; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(0,87,255,0.3); }
.nav-mobile-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-mobile-toggle { display: block; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px; left: 0; right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: 12px;
    gap: 4px;
    box-shadow: var(--shadow);
  }
}

/* ========== HERO — index ========== */
.hero {
  background: linear-gradient(135deg, #0A1628 0%, #1A2F5A 50%, #0057FF 100%);
  position: relative;
  overflow: hidden;
  padding: 80px 24px 60px;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' stroke='rgba(255,255,255,0.04)' stroke-width='1'%3E%3Cpath d='M0 0h60v60H0z'/%3E%3C/g%3E%3C/svg%3E") repeat;
}
.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(0,200,83,0.2);
  border: 1px solid rgba(0,200,83,0.4);
  color: #00C853;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 800;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}
.hero h1 span { color: #5DBAFF; }
.hero-desc {
  font-size: 18px;
  color: rgba(255,255,255,0.8);
  margin-bottom: 36px;
  line-height: 1.7;
}
.hero-btns {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  background: var(--green);
  color: var(--white);
  border: none;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  text-decoration: none;
}
.btn-primary:hover { background: var(--green-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,200,83,0.4); }
.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  background: rgba(255,255,255,0.1);
  color: var(--white);
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
  text-decoration: none;
}
.btn-ghost:hover { background: rgba(255,255,255,0.2); }
.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 36px;
  flex-wrap: wrap;
}
.stat-item { text-align: left; }
.stat-num {
  font-size: 28px;
  font-weight: 800;
  color: var(--white);
  line-height: 1;
}
.stat-num span { color: #00C853; }
.stat-label { font-size: 13px; color: rgba(255,255,255,0.6); margin-top: 4px; }

/* ========== PERF DASHBOARD (hero right) ========== */
.perf-dashboard {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 20px;
  padding: 28px;
  backdrop-filter: blur(12px);
}
.perf-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}
.perf-title {
  font-size: 13px;
  font-weight: 600;
  color: rgba(255,255,255,0.7);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.perf-badge {
  background: rgba(0,200,83,0.2);
  color: #00C853;
  font-size: 12px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 12px;
}
.perf-meter {
  margin-bottom: 18px;
}
.perf-meter-label {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: rgba(255,255,255,0.7);
  margin-bottom: 8px;
}
.perf-meter-label strong { color: var(--white); }
.perf-bar-bg {
  height: 8px;
  background: rgba(255,255,255,0.1);
  border-radius: 4px;
  overflow: hidden;
}
.perf-bar-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 1.2s ease;
}
.bar-chrome { background: linear-gradient(90deg, #0057FF, #00C853); }
.bar-other1 { background: rgba(255,255,255,0.3); }
.bar-other2 { background: rgba(255,255,255,0.2); }
.bar-other3 { background: rgba(255,255,255,0.15); }
.perf-divider { height: 1px; background: rgba(255,255,255,0.08); margin: 20px 0; }
.perf-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.perf-chip {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  background: rgba(255,255,255,0.08);
  border-radius: 20px;
  font-size: 12px;
  color: rgba(255,255,255,0.8);
}
.chip-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #00C853;
  flex-shrink: 0;
}

@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .perf-dashboard { display: none; }
}

/* ========== SECTIONS ========== */
.section { padding: 80px 24px; }
.section-gray { background: var(--gray-50); }
.section-dark { background: var(--gray-900); }
.container { max-width: 1200px; margin: 0 auto; }
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 700;
  color: var(--blue);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
  line-height: 1.25;
}
.section-dark .section-title { color: var(--white); }
.section-subtitle {
  font-size: 17px;
  color: var(--gray-600);
  max-width: 560px;
  line-height: 1.7;
}
.section-dark .section-subtitle { color: rgba(255,255,255,0.65); }

/* ========== NUMBERED PILLARS ========== */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}
.pillar-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 16px;
  padding: 32px 28px;
  position: relative;
  transition: transform var(--transition), box-shadow var(--transition);
}
.pillar-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.pillar-num {
  font-size: 64px;
  font-weight: 900;
  color: var(--blue-light);
  line-height: 1;
  margin-bottom: 16px;
  font-variant-numeric: tabular-nums;
}
.pillar-icon {
  width: 48px; height: 48px;
  background: var(--blue-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.pillar-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 10px;
}
.pillar-text { font-size: 15px; color: var(--gray-600); line-height: 1.65; }
@media (max-width: 768px) { .pillars-grid { grid-template-columns: 1fr; } }
@media (max-width: 1024px) and (min-width: 769px) { .pillars-grid { grid-template-columns: repeat(2, 1fr); } }

/* ========== LAB BENCH (alternating) ========== */
.lab-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  padding: 64px 0;
  border-bottom: 1px solid var(--gray-200);
}
.lab-row:last-child { border-bottom: none; }
.lab-row.reverse .lab-visual { order: -1; }
.lab-visual {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: 20px;
  padding: 36px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.lab-visual-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-600);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}
.metric-row {
  display: flex;
  align-items: center;
  gap: 12px;
}
.metric-name { font-size: 14px; color: var(--gray-600); width: 80px; flex-shrink: 0; }
.metric-bar-bg {
  flex: 1;
  height: 10px;
  background: var(--gray-200);
  border-radius: 5px;
  overflow: hidden;
}
.metric-bar-fill {
  height: 100%;
  border-radius: 5px;
  background: var(--blue);
}
.metric-val { font-size: 14px; font-weight: 700; color: var(--gray-900); width: 48px; text-align: right; flex-shrink: 0; }
.lab-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--blue-light);
  color: var(--blue);
  font-size: 13px;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 20px;
  margin-top: 4px;
}
.lab-content .section-label { display: block; }
.lab-content h3 {
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 16px;
  line-height: 1.3;
}
.lab-content p { font-size: 16px; color: var(--gray-600); line-height: 1.7; margin-bottom: 20px; }
.lab-feature-list { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.lab-feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 15px;
  color: var(--gray-700, #444);
}
.lab-feature-list li svg { flex-shrink: 0; margin-top: 2px; }
@media (max-width: 768px) {
  .lab-row { grid-template-columns: 1fr; gap: 32px; }
  .lab-row.reverse .lab-visual { order: 0; }
}

/* ========== PLATFORM CARDS ========== */
.platforms-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 16px;
  margin-top: 48px;
}
.platform-card {
  background: var(--gray-900);
  border-radius: 16px;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: transform var(--transition);
}
.platform-card:hover { transform: translateY(-3px); }
.platform-card.featured {
  background: linear-gradient(135deg, #0057FF 0%, #0040CC 100%);
}
.platform-icon {
  width: 52px; height: 52px;
  background: rgba(255,255,255,0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.platform-name { font-size: 18px; font-weight: 700; color: var(--white); }
.platform-desc { font-size: 14px; color: rgba(255,255,255,0.6); flex: 1; }
.platform-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 1px solid rgba(255,255,255,0.3);
  background: rgba(255,255,255,0.08);
  color: var(--white);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
  width: 100%;
}
.platform-btn:hover { background: rgba(255,255,255,0.18); }
.platform-card.featured .platform-btn {
  background: var(--white);
  color: var(--blue);
  border-color: transparent;
}
.platform-card.featured .platform-btn:hover { background: var(--gray-100); }
@media (max-width: 900px) { .platforms-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 500px) { .platforms-grid { grid-template-columns: 1fr; } }

/* ========== REVIEWS ========== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}
.review-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 16px;
  padding: 28px;
  position: relative;
}
.review-card::before {
  content: '"';
  position: absolute;
  top: 16px; right: 24px;
  font-size: 72px;
  font-weight: 900;
  color: var(--blue-light);
  line-height: 1;
  font-family: Georgia, serif;
}
.review-stars {
  display: flex;
  gap: 3px;
  margin-bottom: 14px;
}
.review-text { font-size: 15px; color: var(--gray-600); line-height: 1.7; margin-bottom: 20px; }
.review-author { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
  flex-shrink: 0;
}
.review-info { display: flex; flex-direction: column; }
.review-name { font-size: 14px; font-weight: 700; color: var(--gray-900); }
.review-meta { font-size: 13px; color: var(--gray-400); }
@media (max-width: 900px) { .reviews-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .reviews-grid { grid-template-columns: 1fr; } }

/* ========== FAQ ========== */
.faq-list { margin-top: 40px; display: flex; flex-direction: column; gap: 12px; max-width: 800px; }
.faq-item {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  overflow: hidden;
}
.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--gray-900);
  cursor: pointer;
  user-select: none;
  transition: background var(--transition);
}
.faq-q:hover { background: var(--gray-50); }
.faq-chevron {
  flex-shrink: 0;
  transition: transform 0.2s ease;
}
.faq-item.open .faq-chevron { transform: rotate(180deg); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  font-size: 15px;
  color: var(--gray-600);
  line-height: 1.7;
}
.faq-item.open .faq-a {
  max-height: 400px;
  padding: 0 24px 20px;
}

/* ========== CTA BANNER ========== */
.cta-banner {
  background: linear-gradient(135deg, #0057FF 0%, #0040CC 100%);
  border-radius: 24px;
  padding: 60px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  margin: 0 24px;
}
.cta-banner h2 { font-size: 2rem; font-weight: 800; color: var(--white); margin-bottom: 10px; }
.cta-banner p { font-size: 17px; color: rgba(255,255,255,0.8); }
.btn-cta-white {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 32px;
  background: var(--white);
  color: var(--blue);
  border: none;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  text-decoration: none;
}
.btn-cta-white:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.2); }
@media (max-width: 768px) {
  .cta-banner { flex-direction: column; padding: 40px 28px; margin: 0 16px; }
  .cta-banner h2 { font-size: 1.6rem; }
}

/* ========== FOOTER ========== */
.site-footer {
  background: var(--gray-900);
  padding: 40px 24px 28px;
  text-align: center;
}
.footer-inner { max-width: 1200px; margin: 0 auto; }
.footer-security {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0,200,83,0.12);
  border: 1px solid rgba(0,200,83,0.25);
  border-radius: 24px;
  padding: 8px 20px;
  font-size: 14px;
  color: #00C853;
  margin-bottom: 20px;
}
.footer-copy {
  font-size: 13px;
  color: rgba(255,255,255,0.4);
  line-height: 1.7;
}
.footer-copy a { color: rgba(255,255,255,0.6); text-decoration: none; }

/* ========== DOWNLOAD PAGE ========== */
.dl-hero {
  background: linear-gradient(135deg, #0A1628 0%, #1A2F5A 100%);
  padding: 60px 24px;
  text-align: center;
}
.dl-hero h1 { font-size: clamp(1.8rem, 3.5vw, 2.8rem); font-weight: 800; color: var(--white); margin-bottom: 12px; }
.dl-hero p { font-size: 17px; color: rgba(255,255,255,0.75); }
.dl-version-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0,200,83,0.2);
  border: 1px solid rgba(0,200,83,0.35);
  color: #00C853;
  font-size: 13px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 20px;
  margin-top: 16px;
}
.dl-main-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 20px;
  padding: 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-top: 48px;
  box-shadow: var(--shadow-md);
}
.dl-win-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0057FF 0%, #0040CC 100%);
  border-radius: 20px;
  padding: 48px;
}
.dl-win-info h2 { font-size: 1.8rem; font-weight: 800; color: var(--gray-900); margin-bottom: 8px; }
.dl-win-info p { font-size: 16px; color: var(--gray-600); margin-bottom: 24px; line-height: 1.6; }
.dl-specs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 28px;
}
.dl-spec-item {
  background: var(--gray-50);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
}
.dl-spec-label { font-size: 12px; color: var(--gray-400); font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; }
.dl-spec-val { font-size: 14px; color: var(--gray-900); font-weight: 600; margin-top: 2px; }
.btn-dl-main {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 16px 32px;
  background: var(--blue);
  color: var(--white);
  border: none;
  border-radius: var(--radius);
  font-size: 17px;
  font-weight: 700;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}
.btn-dl-main:hover { background: var(--blue-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,87,255,0.35); }
@media (max-width: 768px) {
  .dl-main-card { grid-template-columns: 1fr; }
  .dl-win-icon { padding: 32px; }
}
.other-platforms { margin-top: 32px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.op-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 16px;
  padding: 24px;
  text-align: center;
  transition: box-shadow var(--transition), transform var(--transition);
}
.op-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.op-icon { margin: 0 auto 14px; }
.op-name { font-size: 16px; font-weight: 700; color: var(--gray-900); margin-bottom: 6px; }
.op-desc { font-size: 13px; color: var(--gray-400); margin-bottom: 16px; }
.op-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  padding: 10px 16px;
  background: var(--gray-100);
  color: var(--gray-800);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
}
.op-btn:hover { background: var(--gray-200); }
@media (max-width: 600px) { .other-platforms { grid-template-columns: 1fr; } }

/* ========== REQUIREMENTS TABS ========== */
.tabs { margin-top: 40px; }
.tab-nav {
  display: flex;
  gap: 4px;
  background: var(--gray-100);
  padding: 4px;
  border-radius: 10px;
  width: fit-content;
  margin-bottom: 24px;
}
.tab-btn {
  padding: 8px 20px;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  color: var(--gray-600);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.tab-btn.active { background: var(--white); color: var(--gray-900); box-shadow: var(--shadow); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.req-table { width: 100%; border-collapse: collapse; }
.req-table th, .req-table td { padding: 14px 16px; text-align: left; border-bottom: 1px solid var(--gray-200); font-size: 14px; }
.req-table th { font-weight: 700; color: var(--gray-600); font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; background: var(--gray-50); }
.req-table td { color: var(--gray-800); }
.req-table tr:last-child td { border-bottom: none; }
.req-ok { color: #00A041; font-weight: 600; }

/* ========== INSTALL STEPS ========== */
.steps-track {
  display: flex;
  gap: 0;
  margin-top: 48px;
  position: relative;
}
.steps-track::before {
  content: '';
  position: absolute;
  top: 28px;
  left: 28px;
  right: 28px;
  height: 2px;
  background: var(--gray-200);
}
.step-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  padding: 0 12px;
}
.step-num {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--blue);
  color: var(--white);
  font-size: 20px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
  box-shadow: 0 0 0 6px var(--white);
}
.step-title { font-size: 15px; font-weight: 700; color: var(--gray-900); margin-bottom: 6px; }
.step-desc { font-size: 13px; color: var(--gray-600); line-height: 1.5; }
@media (max-width: 768px) {
  .steps-track { flex-direction: column; gap: 24px; }
  .steps-track::before { display: none; }
  .step-item { flex-direction: row; align-items: flex-start; text-align: left; gap: 16px; }
  .step-num { flex-shrink: 0; }
}

/* ========== ZH-CN PAGE ========== */
.zhen-hero {
  background: linear-gradient(135deg, #f0f4ff 0%, #e8f0ff 100%);
  padding: 60px 24px;
}
.zhen-hero-inner {
  max-width: 900px;
  margin: 0 auto;
}
.zhen-kw-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.kw-tag {
  background: var(--white);
  border: 1px solid var(--blue-light);
  color: var(--blue);
  font-size: 13px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 20px;
}
.zhen-hero h1 {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 16px;
  line-height: 1.3;
}
.zhen-hero p { font-size: 17px; color: var(--gray-600); max-width: 700px; line-height: 1.7; }
.article-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 48px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 24px;
}
.article-toc {
  position: sticky;
  top: 84px;
  height: fit-content;
}
.toc-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 16px;
  padding: 24px;
}
.toc-card h3 { font-size: 14px; font-weight: 700; color: var(--gray-900); margin-bottom: 16px; text-transform: uppercase; letter-spacing: 0.06em; }
.toc-list { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.toc-list a {
  font-size: 14px;
  color: var(--gray-600);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 8px;
  border-radius: 6px;
  transition: background var(--transition), color var(--transition);
}
.toc-list a:hover { background: var(--gray-50); color: var(--blue); }
.toc-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--blue); flex-shrink: 0; }
.dl-side-card {
  background: linear-gradient(135deg, #0057FF 0%, #0040CC 100%);
  border-radius: 16px;
  padding: 24px;
  margin-top: 20px;
  text-align: center;
}
.dl-side-card h4 { font-size: 16px; font-weight: 700; color: var(--white); margin-bottom: 8px; }
.dl-side-card p { font-size: 13px; color: rgba(255,255,255,0.75); margin-bottom: 16px; }
.btn-side-dl {
  display: block;
  padding: 12px 20px;
  background: var(--white);
  color: var(--blue);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: opacity var(--transition);
}
.btn-side-dl:hover { opacity: 0.9; }
.article-section {
  margin-bottom: 48px;
  scroll-margin-top: 84px;
}
.article-section h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--blue-light);
}
.article-section h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--gray-900);
  margin: 20px 0 10px;
}
.article-section p { font-size: 16px; color: var(--gray-700, #555); line-height: 1.8; margin-bottom: 16px; }
.article-section ul, .article-section ol { padding-left: 24px; margin-bottom: 16px; }
.article-section li { font-size: 15px; color: var(--gray-700, #555); line-height: 1.7; margin-bottom: 8px; }
.compare-table { width: 100%; border-collapse: collapse; margin-top: 16px; overflow-x: auto; display: block; }
.compare-table th, .compare-table td { padding: 12px 16px; border: 1px solid var(--gray-200); font-size: 14px; text-align: center; white-space: nowrap; }
.compare-table th { background: var(--gray-50); font-weight: 700; color: var(--gray-800); }
.compare-table td:first-child { text-align: left; font-weight: 600; color: var(--gray-800); }
.compare-check { color: #00A041; font-weight: 700; }
.compare-cross { color: #EA4335; }
.compare-partial { color: #F9A825; }
.version-log { display: flex; flex-direction: column; gap: 16px; }
.version-item {
  display: flex;
  gap: 16px;
  padding: 16px;
  background: var(--gray-50);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--blue);
}
.version-num { font-size: 14px; font-weight: 700; color: var(--blue); white-space: nowrap; }
.version-desc { font-size: 14px; color: var(--gray-700, #555); line-height: 1.6; }
.tips-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 8px;
}
.tip-card {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.tip-num {
  width: 28px; height: 28px;
  background: var(--blue);
  color: var(--white);
  border-radius: 50%;
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.tip-text { font-size: 14px; color: var(--gray-700, #555); line-height: 1.6; }
.article-cta {
  background: linear-gradient(135deg, #0057FF 0%, #0040CC 100%);
  border-radius: 20px;
  padding: 40px;
  text-align: center;
  margin-top: 48px;
}
.article-cta h2 { font-size: 1.8rem; font-weight: 800; color: var(--white); margin-bottom: 12px; }
.article-cta p { font-size: 16px; color: rgba(255,255,255,0.8); margin-bottom: 28px; }
.btn-article-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  background: var(--white);
  color: var(--blue);
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
  transition: transform var(--transition), box-shadow var(--transition);
}
.btn-article-cta:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,0.2); }
@media (max-width: 900px) {
  .article-layout { grid-template-columns: 1fr; }
  .article-toc { display: none; }
}
@media (max-width: 600px) { .tips-grid { grid-template-columns: 1fr; } }

/* ========== UTILITY ========== */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }

/* ========== KEYFRAMES ========== */
@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeInUp 0.6s ease both; }