/* ===== Root Variables ===== */
:root {
  --sky: #1a73e8;
  --sky-dark: #0d5bcc;
  --sky-light: #e8f0fe;
  --green: #34a853;
  --yellow: #fbbc04;
  --red: #ea4335;
  --ink: #202124;
  --ink-2: #3c4043;
  --ink-3: #5f6368;
  --line: #dadce0;
  --surface: #ffffff;
  --bg: #f8f9fa;
  --glass: rgba(255,255,255,0.72);
  --shadow-sm: 0 1px 3px rgba(60,64,67,.12), 0 1px 2px rgba(60,64,67,.08);
  --shadow-md: 0 2px 6px rgba(60,64,67,.15), 0 1px 4px rgba(60,64,67,.1);
  --shadow-lg: 0 4px 16px rgba(60,64,67,.18), 0 2px 8px rgba(60,64,67,.12);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.22s cubic-bezier(.4,0,.2,1);
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Google Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--sky); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--sky-dark); }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ===== Keyframes ===== */
@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}
@keyframes gradMove {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* ===== Top Accent Bar ===== */
.top-accent {
  height: 4px;
  background: linear-gradient(90deg, #4285f4, #34a853, #fbbc04, #ea4335, #4285f4);
  background-size: 300% 100%;
  animation: gradMove 6s ease infinite;
}

/* ===== Navigation ===== */
.site-nav {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}
.nav-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  height: 60px;
  gap: 8px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
  margin-right: 24px;
  flex-shrink: 0;
}
.nav-logo svg { flex-shrink: 0; }
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.nav-links a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-2);
  transition: background var(--transition), color var(--transition);
}
.nav-links a:hover {
  background: var(--sky-light);
  color: var(--sky);
}
.nav-links a.active {
  background: var(--sky);
  color: #fff;
}
.nav-cta {
  margin-left: auto;
}
.nav-cta button {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: var(--sky);
  color: #fff;
  border: none;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition);
}
.nav-cta button:hover { background: var(--sky-dark); box-shadow: 0 2px 8px rgba(26,115,232,.35); }

/* ===== Container ===== */
.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

/* ===== Hero Section ===== */
.hero {
  padding: 80px 0 60px;
  background: linear-gradient(135deg, #e8f0fe 0%, #fff 50%, #e6f4ea 100%);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(26,115,232,.08) 0%, transparent 70%);
  top: -150px; right: -100px;
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(52,168,83,.07) 0%, transparent 70%);
  bottom: -100px; left: -80px;
  pointer-events: none;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  position: relative;
  z-index: 1;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: #e8f0fe;
  color: var(--sky);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: 42px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink);
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}
.hero h1 span { color: var(--sky); }
.hero p {
  font-size: 17px;
  color: var(--ink-2);
  margin-bottom: 32px;
  max-width: 440px;
}
.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  background: var(--sky);
  color: #fff;
  border: none;
  border-radius: 24px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
  box-shadow: 0 2px 8px rgba(26,115,232,.3);
}
.btn-primary:hover {
  background: var(--sky-dark);
  box-shadow: 0 4px 16px rgba(26,115,232,.4);
  transform: translateY(-1px);
}
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  background: transparent;
  color: var(--sky);
  border: 2px solid var(--sky);
  border-radius: 24px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.btn-secondary:hover { background: var(--sky-light); }
.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 40px;
}
.hero-stat { text-align: left; }
.hero-stat .num {
  display: block;
  font-size: 28px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1;
}
.hero-stat .label {
  font-size: 13px;
  color: var(--ink-3);
  margin-top: 4px;
}

/* ===== Browser Showcase Panel ===== */
.browser-panel {
  background: var(--surface);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: fadeUp 0.8s ease both 0.2s;
}
.bp-chrome {
  background: #f1f3f4;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.bp-dot { width: 10px; height: 10px; border-radius: 50%; }
.bp-dot.r { background: #ed6a5e; }
.bp-dot.y { background: #f4bf42; }
.bp-dot.g { background: #61c454; }
.bp-addr {
  flex: 1;
  background: #fff;
  border-radius: 20px;
  padding: 4px 14px;
  font-size: 12px;
  color: var(--ink-3);
  display: flex;
  align-items: center;
  gap: 6px;
}
.bp-body { padding: 24px; }
.bp-url-bar {
  background: var(--bg);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
}
.bp-tab-row {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}
.bp-tab {
  padding: 8px 16px;
  border-radius: 8px 8px 0 0;
  font-size: 12px;
  font-weight: 500;
}
.bp-tab.active { background: #fff; color: var(--ink); box-shadow: var(--shadow-sm); }
.bp-tab.inactive { background: #e8eaed; color: var(--ink-3); }
.bp-content-row { display: flex; gap: 12px; margin-bottom: 12px; }
.bp-card-sm {
  flex: 1;
  background: linear-gradient(135deg, #e8f0fe, #d2e3fc);
  border-radius: 8px;
  height: 64px;
}
.bp-card-sm:nth-child(2) { background: linear-gradient(135deg, #e6f4ea, #ceead6); }
.bp-card-sm:nth-child(3) { background: linear-gradient(135deg, #fef7e0, #fce8b2); }
.bp-metric-row { display: flex; gap: 8px; }
.bp-metric {
  flex: 1;
  background: var(--bg);
  border-radius: 6px;
  height: 40px;
  position: relative;
  overflow: hidden;
}
.bp-metric::after {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  border-radius: 6px;
  background: linear-gradient(90deg, var(--sky), var(--green));
}
.bp-metric:nth-child(1)::after { width: 78%; }
.bp-metric:nth-child(2)::after { width: 92%; background: linear-gradient(90deg, var(--green), #0f9d58); }
.bp-metric:nth-child(3)::after { width: 55%; background: linear-gradient(90deg, var(--yellow), #f9ab00); }

/* ===== Section titles ===== */
.section { padding: 72px 0; }
.section-alt { background: var(--surface); }
.section-head {
  text-align: center;
  margin-bottom: 48px;
}
.section-tag {
  display: inline-block;
  padding: 4px 14px;
  background: var(--sky-light);
  color: var(--sky);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-head h2 {
  font-size: 32px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 12px;
}
.section-head p {
  font-size: 17px;
  color: var(--ink-3);
  max-width: 560px;
  margin: 0 auto;
}

/* ===== Feature Cards Grid ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.feature-icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}
.fi-blue  { background: #e8f0fe; }
.fi-green { background: #e6f4ea; }
.fi-yellow{ background: #fef7e0; }
.fi-red   { background: #fce8e6; }
.fi-purple{ background: #f3e8fd; }
.fi-teal  { background: #e8f5e9; }
.feature-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; color: var(--ink); }
.feature-card p  { font-size: 14px; color: var(--ink-3); line-height: 1.65; }

/* ===== Steps Section ===== */
.steps-track {
  display: flex;
  gap: 0;
  position: relative;
}
.steps-track::before {
  content: '';
  position: absolute;
  top: 32px; left: 32px; right: 32px;
  height: 2px;
  background: linear-gradient(90deg, var(--sky), var(--green));
}
.step-item {
  flex: 1;
  text-align: center;
  padding: 0 16px;
  position: relative;
}
.step-num {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: var(--sky);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 700;
  margin: 0 auto 16px;
  position: relative;
  z-index: 1;
  box-shadow: 0 4px 12px rgba(26,115,232,.35);
}
.step-item:nth-child(2) .step-num { background: var(--green); box-shadow: 0 4px 12px rgba(52,168,83,.35); }
.step-item:nth-child(3) .step-num { background: var(--yellow); color: var(--ink); box-shadow: 0 4px 12px rgba(251,188,4,.35); }
.step-item:nth-child(4) .step-num { background: var(--red); box-shadow: 0 4px 12px rgba(234,67,53,.35); }
.step-item h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; color: var(--ink); }
.step-item p  { font-size: 13px; color: var(--ink-3); }

/* ===== Platform Cards ===== */
.platform-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 20px;
}
.platform-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: box-shadow var(--transition), transform var(--transition);
}
.platform-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.platform-card.featured {
  background: linear-gradient(135deg, #1a73e8 0%, #0d5bcc 100%);
  color: #fff;
  border-color: transparent;
}
.platform-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  background: var(--sky-light);
}
.platform-card.featured .platform-icon { background: rgba(255,255,255,.15); }
.platform-card h3 { font-size: 18px; font-weight: 700; }
.platform-card.featured h3 { color: #fff; }
.platform-card p  { font-size: 13px; color: var(--ink-3); flex: 1; }
.platform-card.featured p { color: rgba(255,255,255,.8); }
.platform-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
  background: rgba(255,255,255,.15);
  color: #fff;
}
.platform-card:not(.featured) .platform-badge {
  background: var(--sky-light);
  color: var(--sky);
}
.platform-dl-btn {
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center; gap: 8px;
  transition: background var(--transition), transform var(--transition);
}
.platform-card.featured .platform-dl-btn {
  background: #fff;
  color: var(--sky);
}
.platform-card.featured .platform-dl-btn:hover { background: #e8f0fe; transform: translateY(-1px); }
.platform-card:not(.featured) .platform-dl-btn {
  background: var(--sky-light);
  color: var(--sky);
}
.platform-card:not(.featured) .platform-dl-btn:hover { background: #d2e3fc; }

/* ===== Reviews ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.review-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  position: relative;
  transition: box-shadow var(--transition);
}
.review-card:hover { box-shadow: var(--shadow-md); }
.review-card::before {
  content: '"';
  position: absolute;
  top: 12px; right: 20px;
  font-size: 64px;
  line-height: 1;
  color: var(--line);
  font-family: Georgia, serif;
}
.review-stars { display: flex; gap: 3px; margin-bottom: 12px; }
.star { color: var(--yellow); font-size: 16px; }
.review-card p { font-size: 14px; color: var(--ink-2); line-height: 1.7; margin-bottom: 16px; }
.reviewer { display: flex; align-items: center; gap: 12px; }
.reviewer-avatar {
  width: 38px; height: 38px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 700; color: #fff;
}
.reviewer-name { font-size: 14px; font-weight: 600; color: var(--ink); }
.reviewer-meta { font-size: 12px; color: var(--ink-3); }

/* ===== Comparison Table ===== */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.compare-table th {
  background: var(--ink);
  color: #fff;
  padding: 14px 20px;
  text-align: left;
  font-size: 14px;
  font-weight: 600;
}
.compare-table th.highlight { background: var(--sky); }
.compare-table td {
  padding: 13px 20px;
  font-size: 14px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-2);
  background: var(--surface);
}
.compare-table tr:hover td { background: var(--bg); }
.compare-table tr:last-child td { border-bottom: none; }
.check { color: var(--green); font-weight: 700; }
.cross { color: var(--ink-3); }
.partial { color: var(--yellow); }
td.col-chrome { background: #e8f0fe !important; font-weight: 600; color: var(--sky); }

/* ===== FAQ Accordion ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  overflow: hidden;
  background: var(--surface);
}
.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  background: none;
  border: none;
  text-align: left;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  gap: 12px;
}
.faq-arrow {
  flex-shrink: 0;
  width: 24px; height: 24px;
  border-radius: 50%;
  background: var(--sky-light);
  display: flex; align-items: center; justify-content: center;
  transition: transform var(--transition), background var(--transition);
}
.faq-item.open .faq-arrow { transform: rotate(180deg); background: var(--sky); }
.faq-item.open .faq-arrow svg { stroke: #fff; }
.faq-a {
  display: none;
  padding: 0 20px 18px;
  font-size: 14px;
  color: var(--ink-3);
  line-height: 1.75;
}
.faq-item.open .faq-a { display: block; }

/* ===== CTA Banner ===== */
.cta-section {
  background: linear-gradient(135deg, #1a73e8 0%, #0d5bcc 100%);
  padding: 72px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(255,255,255,.08) 0%, transparent 70%);
  top: -150px; left: -100px;
}
.cta-section::after {
  content: '';
  position: absolute;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(255,255,255,.06) 0%, transparent 70%);
  bottom: -100px; right: -50px;
}
.cta-section h2 {
  font-size: 36px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  position: relative; z-index: 1;
}
.cta-section p {
  font-size: 17px;
  color: rgba(255,255,255,.8);
  margin-bottom: 32px;
  position: relative; z-index: 1;
}
.cta-actions { display: flex; align-items: center; justify-content: center; gap: 16px; position: relative; z-index: 1; }
.btn-white {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px;
  background: #fff;
  color: var(--sky);
  border: none; border-radius: 24px;
  font-size: 16px; font-weight: 700;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 16px rgba(0,0,0,.15);
}
.btn-white:hover { background: #e8f0fe; transform: translateY(-2px); box-shadow: 0 6px 24px rgba(0,0,0,.2); }
.btn-ghost {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 24px;
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,.5);
  border-radius: 24px;
  font-size: 15px; font-weight: 600;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}
.btn-ghost:hover { border-color: #fff; background: rgba(255,255,255,.1); }

/* ===== Download Page ===== */
.dl-hero {
  background: linear-gradient(135deg, #e8f0fe 0%, #fff 60%);
  padding: 60px 0 48px;
}
.dl-hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.dl-hero h1 { font-size: 36px; font-weight: 700; margin-bottom: 12px; }
.dl-hero p  { font-size: 16px; color: var(--ink-3); margin-bottom: 24px; }
.dl-hero-badges { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 32px; }
.dl-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 12px; font-weight: 600;
}
.dl-badge.blue  { background: #e8f0fe; color: var(--sky); }
.dl-badge.green { background: #e6f4ea; color: var(--green); }
.dl-badge.gray  { background: var(--bg); color: var(--ink-3); border: 1px solid var(--line); }
.win-card {
  background: linear-gradient(135deg, #1a73e8 0%, #0d5bcc 100%);
  border-radius: 20px;
  padding: 36px;
  color: #fff;
  box-shadow: var(--shadow-lg);
}
.win-card-header { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }
.win-icon-wrap {
  width: 64px; height: 64px; border-radius: 16px;
  background: rgba(255,255,255,.15);
  display: flex; align-items: center; justify-content: center;
}
.win-card-title { font-size: 24px; font-weight: 700; }
.win-card-sub   { font-size: 14px; color: rgba(255,255,255,.7); margin-top: 2px; }
.win-info-grid  { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 28px; }
.win-info-item  { background: rgba(255,255,255,.1); border-radius: 10px; padding: 14px 16px; }
.win-info-label { font-size: 11px; color: rgba(255,255,255,.6); text-transform: uppercase; letter-spacing: 0.5px; }
.win-info-value { font-size: 15px; font-weight: 600; margin-top: 4px; }
.win-dl-btn {
  width: 100%;
  padding: 16px;
  background: #fff;
  color: var(--sky);
  border: none; border-radius: 12px;
  font-size: 17px; font-weight: 700;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center; gap: 10px;
  transition: background var(--transition), transform var(--transition);
}
.win-dl-btn:hover { background: #e8f0fe; transform: translateY(-1px); }

/* ===== Other Platforms ===== */
.other-platforms { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 40px; }
.op-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  transition: box-shadow var(--transition), transform var(--transition);
}
.op-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.op-icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 14px;
}
.op-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 6px; }
.op-card p  { font-size: 13px; color: var(--ink-3); margin-bottom: 16px; }
.op-dl-btn {
  width: 100%;
  padding: 10px;
  border: 2px solid var(--sky);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--sky);
  font-size: 14px; font-weight: 600;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center; gap: 6px;
  transition: background var(--transition), color var(--transition);
}
.op-dl-btn:hover { background: var(--sky); color: #fff; }

/* ===== Requirements Table ===== */
.req-tabs { display: flex; gap: 8px; margin-bottom: 24px; }
.req-tab {
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 14px; font-weight: 600;
  cursor: pointer;
  border: 2px solid var(--line);
  background: transparent;
  color: var(--ink-3);
  transition: all var(--transition);
}
.req-tab.active { border-color: var(--sky); background: var(--sky); color: #fff; }
.req-panel { display: none; }
.req-panel.active { display: block; }
.req-table { width: 100%; border-collapse: collapse; }
.req-table th {
  background: var(--bg);
  padding: 12px 18px;
  text-align: left;
  font-size: 13px; font-weight: 600;
  color: var(--ink-3);
  border-bottom: 2px solid var(--line);
}
.req-table td {
  padding: 12px 18px;
  font-size: 14px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-2);
}
.req-table tr:last-child td { border-bottom: none; }

/* ===== Security Strip ===== */
.security-strip {
  background: #e6f4ea;
  border-top: 2px solid #ceead6;
  padding: 24px 0;
}
.security-inner {
  display: flex; align-items: center; gap: 32px; flex-wrap: wrap; justify-content: center;
}
.security-item {
  display: flex; align-items: center; gap: 8px;
  font-size: 14px; font-weight: 500; color: var(--green);
}

/* ===== Article layout (zh-cn) ===== */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 48px;
  align-items: start;
  padding: 60px 0;
}
.article-body h2 {
  font-size: 24px; font-weight: 700;
  color: var(--ink); margin: 40px 0 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--line);
}
.article-body h2:first-child { margin-top: 0; }
.article-body h3 { font-size: 18px; font-weight: 700; color: var(--ink); margin: 24px 0 10px; }
.article-body p  { font-size: 15px; color: var(--ink-2); line-height: 1.8; margin-bottom: 16px; }
.article-body ul { margin: 0 0 16px 0; }
.article-body ul li {
  font-size: 15px; color: var(--ink-2); padding: 6px 0 6px 20px;
  position: relative; line-height: 1.7;
}
.article-body ul li::before {
  content: '';
  position: absolute; left: 0; top: 14px;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--sky);
}
.article-kw {
  display: inline-block;
  padding: 3px 10px;
  background: var(--sky-light);
  color: var(--sky);
  border-radius: 4px;
  font-weight: 600;
  font-size: 14px;
}
.article-toc {
  position: sticky;
  top: 80px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}
.toc-title { font-size: 14px; font-weight: 700; color: var(--ink-3); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 14px; }
.toc-list { display: flex; flex-direction: column; gap: 4px; }
.toc-list a {
  display: block;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  font-size: 13px; color: var(--ink-3);
  transition: background var(--transition), color var(--transition);
  border-left: 3px solid transparent;
}
.toc-list a:hover,
.toc-list a.active {
  background: var(--sky-light);
  color: var(--sky);
  border-left-color: var(--sky);
}

/* ===== Info Box ===== */
.info-box {
  background: var(--sky-light);
  border-left: 4px solid var(--sky);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 16px 20px;
  margin: 20px 0;
}
.info-box p { margin: 0; font-size: 14px; color: var(--ink-2); }

/* ===== Version table ===== */
.version-table { width: 100%; border-collapse: collapse; margin: 16px 0; }
.version-table th { background: var(--sky); color: #fff; padding: 11px 16px; text-align: left; font-size: 13px; }
.version-table td { padding: 11px 16px; font-size: 14px; border-bottom: 1px solid var(--line); color: var(--ink-2); background: var(--surface); }
.version-table tr:last-child td { border-bottom: none; }
.tag-new { display: inline-block; padding: 2px 8px; border-radius: 4px; font-size: 11px; font-weight: 700; background: #e6f4ea; color: var(--green); }
.tag-sec { display: inline-block; padding: 2px 8px; border-radius: 4px; font-size: 11px; font-weight: 700; background: #fce8e6; color: var(--red); }
.tag-fix { display: inline-block; padding: 2px 8px; border-radius: 4px; font-size: 11px; font-weight: 700; background: #fef7e0; color: #f9ab00; }

/* ===== Article CTA ===== */
.article-cta {
  background: linear-gradient(135deg, #1a73e8, #0d5bcc);
  border-radius: 16px;
  padding: 40px;
  text-align: center;
  margin-top: 40px;
  color: #fff;
}
.article-cta h3 { font-size: 24px; font-weight: 700; margin-bottom: 10px; }
.article-cta p  { font-size: 15px; color: rgba(255,255,255,.8); margin-bottom: 24px; }
.article-cta a {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 36px;
  background: #fff; color: var(--sky);
  border-radius: 24px; font-size: 16px; font-weight: 700;
  transition: background var(--transition), transform var(--transition);
}
.article-cta a:hover { background: #e8f0fe; transform: translateY(-2px); }

/* ===== Tips Grid ===== */
.tips-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.tip-item {
  display: flex; gap: 12px;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: 16px;
}
.tip-num {
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--sky); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 700; flex-shrink: 0;
}
.tip-text h4 { font-size: 14px; font-weight: 700; color: var(--ink); margin-bottom: 4px; }
.tip-text p  { font-size: 13px; color: var(--ink-3); margin: 0; }

/* ===== Footer ===== */
.site-footer {
  background: var(--ink);
  color: rgba(255,255,255,.7);
  padding: 40px 0 24px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255,255,255,.1);
  margin-bottom: 24px;
}
.footer-brand .nav-logo { color: #fff; margin-bottom: 12px; }
.footer-brand p { font-size: 13px; line-height: 1.7; max-width: 260px; }
.footer-col h4 { color: #fff; font-size: 14px; font-weight: 600; margin-bottom: 12px; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: 13px; color: rgba(255,255,255,.55); transition: color var(--transition); }
.footer-col ul li a:hover { color: #fff; }
.footer-bottom { text-align: center; font-size: 12px; color: rgba(255,255,255,.45); line-height: 1.8; }
.footer-bottom .safe-tag { color: var(--green); font-weight: 600; font-size: 13px; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .platform-grid { grid-template-columns: 1fr 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .article-layout { grid-template-columns: 1fr; }
  .article-toc { position: static; }
}
@media (max-width: 768px) {
  .hero-inner { grid-template-columns: 1fr; }
  .browser-panel { display: none; }
  .hero h1 { font-size: 30px; }
  .steps-track { flex-direction: column; gap: 24px; }
  .steps-track::before { display: none; }
  .features-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .platform-grid { grid-template-columns: 1fr; }
  .other-platforms { grid-template-columns: 1fr; }
  .dl-hero-inner { grid-template-columns: 1fr; }
  .nav-links a span { display: none; }
  .footer-inner { grid-template-columns: 1fr; }
  .win-info-grid { grid-template-columns: 1fr; }
  .tips-grid { grid-template-columns: 1fr; }
  .cta-actions { flex-direction: column; }
}