/* === DeepSeek zhuti5 — Swiss Geometric Blue === */

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

:root {
  --brand: oklch(0.54 0.19 228);
  --brand-hover: oklch(0.47 0.18 228);
  --brand-light: oklch(0.94 0.03 230);
  --brand-surface: oklch(0.975 0.01 235);
  --bg: oklch(1 0 0);
  --surface: oklch(1 0 0);
  --ink: oklch(0.14 0.01 260);
  --ink-secondary: oklch(0.40 0.01 260);
  --ink-muted: oklch(0.56 0.01 260);
  --border: oklch(0.17 0.01 260);
  --border-light: oklch(0.88 0.005 240);
  --border-subtle: oklch(0.93 0.003 240);
  --font: "PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,sans-serif;
  --mono: "SF Mono","Cascadia Code","Consolas",monospace;
  --w: 1000px;
}

html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font); color: var(--ink); background: var(--bg);
  line-height: 1.6; -webkit-font-smoothing: antialiased;
}

.wrap { max-width: var(--w); margin: 0 auto; padding: 0 28px; }

/* Nav */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: var(--bg);
  border-bottom: 2px solid var(--border);
}
.navbar .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 1.05rem; color: var(--ink);
  text-decoration: none; letter-spacing: 0.02em; text-transform: uppercase;
}
.nav-logo svg { width: 26px; height: 26px; flex-shrink: 0; }
.nav-links { display: flex; gap: 0; align-items: center; }
.nav-links a {
  font-size: 0.8rem; font-weight: 500; color: var(--ink-secondary);
  text-decoration: none; letter-spacing: 0.04em; text-transform: uppercase;
  padding: 8px 16px; border-bottom: 2px solid transparent;
  transition: all 0.15s;
}
.nav-links a:hover { color: var(--ink); border-bottom-color: var(--border-light); }
.nav-links a.active { color: var(--brand); border-bottom-color: var(--brand); }

/* Hero */
.hero {
  padding: 100px 0 80px;
  background: var(--bg);
  border-bottom: 1px solid var(--border-subtle);
  position: relative; overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; top: -60px; right: -80px;
  width: 320px; height: 320px;
  border: 2px solid var(--border-light);
  transform: rotate(15deg);
  pointer-events: none;
}
.hero::after {
  content: ""; position: absolute; bottom: -40px; left: -60px;
  width: 200px; height: 200px;
  border: 1.5px solid var(--border-subtle);
  transform: rotate(-10deg);
  pointer-events: none;
}
.hero .wrap { position: relative; z-index: 1; max-width: 660px; }
.hero h1 {
  font-size: 2.8rem; font-weight: 700; line-height: 1.2;
  color: var(--ink); letter-spacing: -0.02em;
  border-left: 4px solid var(--brand); padding-left: 24px;
}
.hero p {
  font-size: 1rem; color: var(--ink-secondary);
  margin-top: 24px; padding-left: 28px; line-height: 1.75; max-width: 520px;
}
.hero-actions { margin-top: 36px; padding-left: 28px; display: flex; gap: 16px; flex-wrap: wrap; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 28px; font-size: 0.85rem;
  font-weight: 600; text-decoration: none; cursor: pointer;
  letter-spacing: 0.03em; text-transform: uppercase;
  transition: all 0.15s; position: relative;
}
.btn-primary {
  background: var(--brand); color: #fff; border: none;
}
.btn-primary:hover { background: var(--brand-hover); }
.btn-outline {
  background: transparent; color: var(--ink); border: 2px solid var(--border);
}
.btn-outline:hover { border-color: var(--brand); color: var(--brand); }
.btn-lg { padding: 14px 36px; font-size: 0.9rem; }

/* Sections */
.section { padding: 80px 0; }
.section-alt {
  padding: 80px 0;
  background: var(--brand-surface);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}
.section-heading {
  font-size: 1.5rem; font-weight: 700; letter-spacing: -0.01em;
  margin-bottom: 8px; color: var(--ink);
  display: inline-block;
}
.section-heading::after {
  content: ""; display: block; width: 48px; height: 3px;
  background: var(--brand); margin-top: 8px;
}
.section-sub {
  font-size: 0.92rem; color: var(--ink-muted); margin: 16px 0 40px;
  max-width: 560px; line-height: 1.65;
}

/* Stats */
.stats-bar {
  display: flex; gap: 0; margin-top: 48px;
  border: 2px solid var(--border);
}
.stat-item {
  flex: 1; padding: 32px 28px; text-align: center;
  border-right: 1px solid var(--border-subtle);
}
.stat-item:last-child { border-right: none; }
.stat-num {
  font-size: 2rem; font-weight: 700; color: var(--brand);
  letter-spacing: -0.02em; line-height: 1.2;
}
.stat-label {
  font-size: 0.75rem; color: var(--ink-muted); font-weight: 500;
  margin-top: 6px; text-transform: uppercase; letter-spacing: 0.08em;
}

/* Swiss grid */
.swiss-grid {
  display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1px;
  background: var(--border-light);
  border: 2px solid var(--border);
}
.swiss-item {
  padding: 36px 28px; background: var(--surface);
  border: none;
}
.swiss-item h3 { font-size: 1rem; font-weight: 700; color: var(--ink); margin-bottom: 10px; letter-spacing: -0.01em; }
.swiss-item p { font-size: 0.85rem; color: var(--ink-secondary); line-height: 1.6; }

/* Capability list */
.cap-list { display: flex; flex-direction: column; gap: 0; border: 2px solid var(--border); }
.cap-row {
  display: flex; align-items: flex-start; gap: 20px;
  padding: 22px 28px; border-bottom: 1px solid var(--border-subtle);
  background: var(--surface);
}
.cap-row:last-child { border-bottom: none; }
.cap-row-icon { font-size: 1.4rem; flex-shrink: 0; width: 32px; }
.cap-row h4 { font-size: 0.9rem; font-weight: 600; color: var(--ink); margin-bottom: 4px; }
.cap-row p { font-size: 0.82rem; color: var(--ink-secondary); line-height: 1.55; }

/* FAQ compact */
.faq-compact { border: 2px solid var(--border); }
.faq-compact details {
  border-bottom: 1px solid var(--border-subtle); padding: 16px 24px;
}
.faq-compact details:last-child { border-bottom: none; }
.faq-compact summary {
  font-weight: 600; font-size: 0.9rem; cursor: pointer;
  color: var(--ink); list-style: none; display: flex; justify-content: space-between;
}
.faq-compact summary::after { content: "+"; font-size: 1.2rem; color: var(--brand); }
.faq-compact details[open] summary::after { content: "‘2"; }
.faq-compact p { font-size: 0.85rem; color: var(--ink-secondary); margin-top: 10px; line-height: 1.6; }

/* CTA */
.cta-section { text-align: center; padding: 80px 0; }

/* Footer */
.footer {
  padding: 32px 0; border-top: 2px solid var(--border);
  font-size: 0.78rem; color: var(--ink-muted);
  background: var(--bg);
}
.footer .wrap { display: flex; justify-content: space-between; align-items: center; }
.footer nav a { color: var(--ink-muted); text-decoration: none; margin-left: 20px; }
.footer nav a:hover { color: var(--brand); }

/* Download */
.download-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1px;
  background: var(--border-light);
  border: 2px solid var(--border);
}
.download-card {
  padding: 36px 32px; background: var(--surface);
}
.download-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 6px; }
.download-card .ver { font-size: 0.78rem; color: var(--ink-muted); margin-bottom: 14px; text-transform: uppercase; letter-spacing: 0.04em; }
.download-card .desc { font-size: 0.82rem; color: var(--ink-secondary); margin-bottom: 18px; }

/* Feature table */
.feat-table { width: 100%; border-collapse: collapse; margin-top: 32px; font-size: 0.85rem; border: 2px solid var(--border); }
.feat-table th, .feat-table td { border: 1px solid var(--border-subtle); padding: 14px 20px; text-align: left; }
.feat-table th { font-weight: 600; color: var(--ink); background: var(--brand-surface); text-transform: uppercase; letter-spacing: 0.04em; font-size: 0.78rem; }
.feat-table td { color: var(--ink-secondary); }

/* Pricing table */
.pricing-table { width: 100%; border-collapse: collapse; margin-top: 24px; font-size: 0.85rem; border: 2px solid var(--border); }
.pricing-table th, .pricing-table td { border: 1px solid var(--border-subtle); padding: 16px 22px; text-align: left; }
.pricing-table th { background: var(--ink); color: #fff; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; font-size: 0.78rem; font-weight: 600; }
.pricing-table tr:nth-child(even) td { background: var(--brand-surface); }
.price-highlight { font-weight: 700; color: var(--brand); font-size: 1.05rem; }

/* FAQ page */
.faq-category { margin-bottom: 48px; }
.faq-category h3 {
  font-size: 0.85rem; font-weight: 700; color: var(--ink);
  text-transform: uppercase; letter-spacing: 0.08em;
  margin-bottom: 16px; padding-bottom: 10px;
  border-bottom: 2px solid var(--border);
}
.faq-page details {
  border-bottom: 1px solid var(--border-subtle); padding: 18px 0;
}
.faq-page summary {
  font-weight: 600; font-size: 0.92rem; cursor: pointer; color: var(--ink);
  list-style: none; display: flex; align-items: baseline;
}
.faq-page summary::before {
  content: "Q"; color: var(--brand); font-weight: 700; font-size: 0.85rem;
  margin-right: 12px; border: 1.5px solid var(--brand); padding: 0 6px;
}
.faq-page p {
  font-size: 0.85rem; color: var(--ink-secondary); margin-top: 10px;
  padding-left: 42px; line-height: 1.65;
}

/* 404 */
.error-page { text-align: center; padding: 140px 0; }
.error-page h1 {
  font-size: 6rem; font-weight: 700; color: var(--brand);
  letter-spacing: -0.04em; line-height: 1;
}
.error-page p { font-size: 1rem; color: var(--ink-secondary); margin: 20px 0 32px; }

@media (max-width: 768px) {
  .hero h1 { font-size: 1.8rem; }
  .swiss-grid { grid-template-columns: 1fr; }
  .stats-bar { flex-wrap: wrap; }
  .stat-item { flex: 1 1 50%; min-width: 140px; }
  .download-grid { grid-template-columns: 1fr; }
  .nav-links a { padding: 8px 10px; font-size: 0.7rem; }
}