:root {
  --cream: #fafaf9;
  --surface: #f5f5f4;
  --warm: #e7e5e4;
  --ink: #1c1917;
  --ink-light: #292524;
  --ink-muted: #57534e;
  --ink-faint: #a8a29e;
  --terra: #c2410c;
  --terra-deep: #9a3412;
  --terra-light: #ea580c;
  --terra-pale: #fff7ed;
  --umber: #7c2d12;
  --amber: #d97706;
  --amber-pale: #fffbeb;
  --white: #ffffff;
  --shadow: 0 1px 3px rgba(28,25,23,0.08), 0 4px 12px rgba(28,25,23,0.06);
  --shadow-hover: 0 4px 6px rgba(28,25,23,0.1), 0 10px 24px rgba(28,25,23,0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--cream);
  line-height: 1.7;
  font-size: 16px;
}

@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

/* Navigation */
.topnav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(250,250,249,0.92); backdrop-filter: blur(12px) saturate(1.2);
  border-bottom: 1px solid var(--warm);
}
.topnav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between; height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-icon {
  width: 32px; height: 32px; background: var(--terra); border-radius: 8px;
  display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 800; font-size: 14px;
}
.brand-text { font-weight: 800; font-size: 18px; color: var(--ink); letter-spacing: -0.5px; }
.nav-menu { display: flex; align-items: center; gap: 6px; list-style: none; }
.nav-link {
  text-decoration: none; color: var(--ink-muted); font-size: 14px; font-weight: 500;
  padding: 8px 14px; border-radius: 20px; transition: all 0.25s ease;
}
.nav-link:hover, .nav-link.active {
  color: var(--terra); background: var(--terra-pale);
}
.nav-cta {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--terra); color: #fff; padding: 10px 20px; border-radius: 24px;
  font-size: 14px; font-weight: 600; text-decoration: none; border: none; cursor: pointer;
  transition: all 0.25s ease;
}
.nav-cta:hover { background: var(--terra-deep); transform: translateY(-1px); }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle svg { width: 24px; height: 24px; stroke: var(--ink); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-size: 15px; font-weight: 600; padding: 12px 28px; border-radius: 10px;
  border: none; cursor: pointer; text-decoration: none; transition: all 0.25s ease;
  line-height: 1.4;
}
.btn-primary { background: var(--terra); color: #fff; }
.btn-primary:hover { background: var(--terra-deep); transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.btn-secondary { background: var(--amber); color: #fff; }
.btn-secondary:hover { background: #b45309; transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.btn-outline { background: transparent; color: var(--terra); border: 1.5px solid var(--terra); }
.btn-outline:hover { background: var(--terra-pale); }
.btn-ghost { background: transparent; color: var(--ink-muted); }
.btn-ghost:hover { background: var(--warm); color: var(--ink); }
.btn-lg { padding: 14px 36px; font-size: 16px; border-radius: 12px; }
.btn-sm { padding: 8px 18px; font-size: 13px; border-radius: 8px; }

/* Layout */
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.sec { padding: 80px 0; }
.sec-light { background: var(--cream); }
.sec-surface { background: var(--surface); }
.sec-warm { background: var(--terra-pale); }
.sec-amber { background: var(--amber-pale); }
.sec-dark { background: var(--ink); color: #fff; }
.sec-dark .sec-title, .sec-dark .sec-sub { color: #fff; }

.sec-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.sec-tag {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; color: var(--terra); text-transform: uppercase; letter-spacing: 0.5px;
  margin-bottom: 14px;
}
.sec-tag-dot { width: 8px; height: 8px; background: var(--terra); border-radius: 50%; display: inline-block; }
.sec-title { font-size: 34px; font-weight: 800; color: var(--ink); line-height: 1.25; margin-bottom: 14px; letter-spacing: -0.5px; }
.sec-sub { font-size: 17px; color: var(--ink-muted); line-height: 1.7; }

/* Hero */
.hero { padding: 140px 0 100px; background: var(--cream); position: relative; overflow: hidden; }
.hero::before {
  content: ''; position: absolute; top: -200px; right: -200px; width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(194,65,12,0.06) 0%, transparent 70%); border-radius: 50%;
}
.hero::after {
  content: ''; position: absolute; bottom: -150px; left: -150px; width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(217,119,6,0.06) 0%, transparent 70%); border-radius: 50%;
}
.hero-inner { position: relative; z-index: 1; display: flex; align-items: center; gap: 64px; }
.hero-text { flex: 1; }
.hero-chip {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--terra-pale); color: var(--terra); padding: 8px 16px; border-radius: 20px;
  font-size: 13px; font-weight: 600; margin-bottom: 24px;
}
.hero-chip-dot { width: 8px; height: 8px; background: var(--terra); border-radius: 50%; }
.hero-h1 { font-size: 52px; font-weight: 900; line-height: 1.1; color: var(--ink); letter-spacing: -1.5px; margin-bottom: 20px; }
.hero-hl { color: var(--terra); }
.hero-p { font-size: 18px; color: var(--ink-muted); margin-bottom: 32px; max-width: 520px; line-height: 1.8; }
.hero-btns { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-bottom: 36px; }
.hero-trust { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.hero-trust-item { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--ink-faint); }
.hero-trust-item svg { width: 16px; height: 16px; color: var(--terra); }

.hero-stats { flex: 0 0 420px; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.hero-stat {
  background: var(--white); border: 1px solid var(--warm); border-radius: 14px;
  padding: 24px; box-shadow: var(--shadow); transition: all 0.3s ease;
}
.hero-stat:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.hero-stat-num { font-size: 32px; font-weight: 800; color: var(--terra); line-height: 1; margin-bottom: 6px; }
.hero-stat-lbl { font-size: 13px; color: var(--ink-faint); }

/* Features */
.feat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.feat-card {
  background: var(--white); border: 1px solid var(--warm); border-radius: 14px;
  padding: 32px; transition: all 0.3s ease; position: relative; overflow: hidden;
}
.feat-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--terra); opacity: 0; transition: opacity 0.3s ease;
}
.feat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.feat-card:hover::before { opacity: 1; }
.feat-icon { width: 44px; height: 44px; background: var(--terra-pale); border-radius: 12px; display: flex; align-items: center; justify-content: center; margin-bottom: 18px; color: var(--terra); }
.feat-icon svg { width: 22px; height: 22px; }
.feat-name { font-size: 18px; font-weight: 700; color: var(--ink); margin-bottom: 10px; }
.feat-desc { font-size: 14px; color: var(--ink-muted); line-height: 1.7; }

/* Deep rows */
.deep-row { display: flex; align-items: center; gap: 56px; margin-top: 72px; }
.deep-row.flip { flex-direction: row-reverse; }
.deep-info { flex: 1; }
.deep-tag {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12px; font-weight: 700; color: var(--terra); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 14px;
}
.deep-tag-dot { width: 6px; height: 6px; background: var(--terra); border-radius: 50%; }
.deep-h3 { font-size: 28px; font-weight: 800; color: var(--ink); line-height: 1.3; margin-bottom: 16px; letter-spacing: -0.5px; }
.deep-desc { font-size: 16px; color: var(--ink-muted); line-height: 1.8; margin-bottom: 20px; }
.deep-list { list-style: none; }
.deep-list-item { display: flex; align-items: flex-start; gap: 10px; font-size: 15px; color: var(--ink-muted); margin-bottom: 10px; }
.deep-list-item svg { width: 18px; height: 18px; color: var(--terra); flex-shrink: 0; margin-top: 2px; }
.deep-media { flex: 0 0 440px; background: var(--surface); border-radius: 16px; padding: 32px; border: 1px solid var(--warm); }
.deep-media-bar {
  display: flex; align-items: center; gap: 10px; margin-bottom: 20px;
}
.deep-media-bar-dot { width: 10px; height: 10px; border-radius: 50%; }
.deep-media-bar-dot.r { background: #ef4444; }
.deep-media-bar-dot.y { background: #eab308; }
.deep-media-bar-dot.g { background: #22c55e; }
.deep-media-title { font-size: 13px; color: var(--ink-faint); font-weight: 500; }
.deep-visual { display: flex; flex-direction: column; gap: 14px; }
.dv-row { display: flex; align-items: center; gap: 12px; }
.dv-label { font-size: 12px; color: var(--ink-faint); width: 80px; flex-shrink: 0; }
.dv-track { flex: 1; height: 10px; background: var(--warm); border-radius: 5px; overflow: hidden; }
.dv-fill { height: 100%; border-radius: 5px; background: linear-gradient(90deg, var(--terra), var(--amber)); }
.dv-val { font-size: 12px; color: var(--ink-muted); font-weight: 600; width: 36px; text-align: right; }
.dv-stat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 20px; }
.dv-stat { text-align: center; padding: 16px; background: var(--white); border-radius: 10px; }
.dv-stat-num { font-size: 22px; font-weight: 800; color: var(--terra); }
.dv-stat-lbl { font-size: 12px; color: var(--ink-faint); margin-top: 4px; }

/* Platforms */
.plat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.plat-card {
  background: var(--white); border: 1px solid var(--warm); border-radius: 14px;
  padding: 28px; text-align: center; transition: all 0.3s ease; position: relative;
}
.plat-card.featured { border-color: var(--terra); box-shadow: 0 0 0 1px var(--terra); }
.plat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.plat-badge {
  position: absolute; top: -1px; left: 50%; transform: translateX(-50%);
  background: var(--terra); color: #fff; font-size: 11px; font-weight: 700;
  padding: 4px 14px; border-radius: 0 0 10px 10px; text-transform: uppercase; letter-spacing: 0.5px;
}
.plat-icon { width: 52px; height: 52px; background: var(--terra-pale); border-radius: 14px; display: flex; align-items: center; justify-content: center; margin: 0 auto 16px; color: var(--terra); }
.plat-icon svg { width: 26px; height: 26px; }
.plat-name { font-size: 17px; font-weight: 700; color: var(--ink); margin-bottom: 4px; }
.plat-ver { font-size: 12px; color: var(--ink-faint); margin-bottom: 10px; }
.plat-desc { font-size: 13px; color: var(--ink-muted); line-height: 1.6; margin-bottom: 16px; }
.plat-btn { width: 100%; }

/* Reviews */
.rev-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.rev-card {
  background: var(--white); border: 1px solid var(--warm); border-radius: 14px;
  padding: 28px; transition: all 0.3s ease;
}
.rev-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.rev-stars { display: flex; gap: 3px; margin-bottom: 14px; }
.rev-stars svg { width: 16px; height: 16px; color: var(--amber); fill: currentColor; }
.rev-text { font-size: 15px; color: var(--ink-muted); line-height: 1.8; margin-bottom: 18px; }
.rev-author { display: flex; align-items: center; gap: 12px; }
.rev-avatar {
  width: 40px; height: 40px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 700; color: #fff;
}
.rev-name { font-size: 14px; font-weight: 700; color: var(--ink); }
.rev-role { font-size: 12px; color: var(--ink-faint); }

/* Security */
.sec-items { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 56px; }
.sec-item {
  background: var(--white); border: 1px solid var(--warm); border-radius: 14px;
  padding: 28px; text-align: center; transition: all 0.3s ease;
}
.sec-item:hover { box-shadow: var(--shadow-hover); }
.sec-item-icon { width: 48px; height: 48px; background: var(--terra-pale); border-radius: 12px; display: flex; align-items: center; justify-content: center; margin: 0 auto 14px; color: var(--terra); }
.sec-item-icon svg { width: 24px; height: 24px; }
.sec-item-title { font-size: 16px; font-weight: 700; color: var(--ink); margin-bottom: 6px; }
.sec-item-desc { font-size: 13px; color: var(--ink-muted); line-height: 1.6; }

/* Comparison */
.cmp-wrap { overflow-x: auto; }
.cmp-table { width: 100%; border-collapse: collapse; font-size: 14px; background: var(--white); border-radius: 14px; overflow: hidden; border: 1px solid var(--warm); }
.cmp-table th, .cmp-table td { padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--warm); }
.cmp-table th { background: var(--surface); font-weight: 700; color: var(--ink); font-size: 13px; text-transform: uppercase; letter-spacing: 0.5px; }
.cmp-table td { color: var(--ink-muted); }
.cmp-table tr:last-child td { border-bottom: none; }
.cmp-hl { color: var(--terra); font-weight: 700; }
.yes { color: #16a34a; font-weight: 700; }
.no { color: #ef4444; font-weight: 700; }
.part { color: var(--amber); font-weight: 700; }

/* Versions */
.ver-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; align-items: start; }
.ver-card {
  background: var(--white); border: 1px solid var(--warm); border-radius: 16px;
  padding: 32px; transition: all 0.3s ease;
}
.ver-card.featured { border-color: var(--terra); box-shadow: 0 0 0 1px var(--terra), var(--shadow); position: relative; transform: scale(1.02); }
.ver-badge {
  position: absolute; top: 0; right: 24px;
  background: var(--terra); color: #fff; font-size: 11px; font-weight: 700;
  padding: 6px 14px; border-radius: 0 0 10px 10px;
}
.ver-name { font-size: 20px; font-weight: 800; color: var(--ink); margin-bottom: 4px; }
.ver-price { font-size: 36px; font-weight: 900; color: var(--terra); line-height: 1; margin: 16px 0 4px; }
.ver-price-note { font-size: 13px; color: var(--ink-faint); margin-bottom: 20px; }
.ver-list { list-style: none; }
.ver-list-item { display: flex; align-items: flex-start; gap: 8px; font-size: 14px; color: var(--ink-muted); padding: 8px 0; border-bottom: 1px solid var(--warm); }
.ver-list-item:last-child { border-bottom: none; }
.ver-list-item svg { width: 18px; height: 18px; color: var(--terra); flex-shrink: 0; margin-top: 2px; }
.ver-card .btn { width: 100%; margin-top: 20px; }

/* FAQ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--warm); }
.faq-q {
  display: flex; align-items: center; justify-content: space-between;
  padding: 22px 0; cursor: pointer; font-size: 16px; font-weight: 600; color: var(--ink);
  transition: color 0.2s ease;
}
.faq-q:hover { color: var(--terra); }
.faq-chevron { width: 20px; height: 20px; color: var(--ink-faint); transition: transform 0.3s ease; flex-shrink: 0; }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; }
.faq-a-inner { padding: 0 0 24px 0; font-size: 15px; color: var(--ink-muted); line-height: 1.8; }
.faq-item.open .faq-chevron { transform: rotate(180deg); color: var(--terra); }
.faq-item.open .faq-a { max-height: 500px; }

/* CTA Banner */
.cta-banner { padding: 80px 0; }
.cta-inner { background: var(--ink); border-radius: 20px; padding: 60px; text-align: center; position: relative; overflow: hidden; }
.cta-inner::before {
  content: ''; position: absolute; top: -100px; right: -100px; width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(194,65,12,0.2) 0%, transparent 70%); border-radius: 50%;
}
.cta-h2 { font-size: 34px; font-weight: 800; color: #fff; margin-bottom: 14px; position: relative; z-index: 1; letter-spacing: -0.5px; }
.cta-p { font-size: 17px; color: var(--ink-faint); margin-bottom: 28px; position: relative; z-index: 1; }
.cta-btns { display: flex; align-items: center; justify-content: center; gap: 14px; flex-wrap: wrap; position: relative; z-index: 1; }

/* Footer */
.site-footer { background: var(--surface); border-top: 1px solid var(--warm); padding: 40px 0; }
.footer-inner { text-align: center; }
.footer-brand { font-size: 18px; font-weight: 800; color: var(--ink); margin-bottom: 10px; }
.footer-security { font-size: 13px; color: var(--ink-faint); margin-bottom: 6px; }
.footer-note { font-size: 13px; color: var(--ink-faint); }

/* Responsive */
@media (max-width: 1024px) {
  .hero-inner { flex-direction: column; gap: 48px; }
  .hero-stats { flex: 1; width: 100%; }
  .deep-row, .deep-row.flip { flex-direction: column; gap: 36px; }
  .deep-media { flex: 1; width: 100%; }
  .plat-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-menu { display: none; position: absolute; top: 64px; left: 0; right: 0; background: rgba(250,250,249,0.98); flex-direction: column; padding: 16px 24px; border-bottom: 1px solid var(--warm); gap: 4px; }
  .nav-menu.show { display: flex; }
  .nav-toggle { display: block; }
  .nav-cta { display: none; }
  .hero { padding: 120px 0 60px; }
  .hero-h1 { font-size: 36px; }
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .feat-grid { grid-template-columns: 1fr; }
  .rev-grid { grid-template-columns: 1fr; }
  .sec-items { grid-template-columns: 1fr 1fr; }
  .ver-grid { grid-template-columns: 1fr; }
  .plat-grid { grid-template-columns: 1fr; }
  .sec-title { font-size: 28px; }
  .cta-h2 { font-size: 26px; }
  .cta-inner { padding: 40px 24px; }
  .deep-h3 { font-size: 22px; }
}

@media (max-width: 480px) {
  .hero-stats { grid-template-columns: 1fr; }
  .sec-items { grid-template-columns: 1fr; }
  .hero-btns { flex-direction: column; align-items: stretch; }
  .hero-btns .btn { width: 100%; }
  .hero-h1 { font-size: 30px; }
  .sec { padding: 56px 0; }
}