:root {
  --color-primary: #0a0a0a;
  --color-on-primary: #ffffff;
  --color-primary-soft: #181e25;
  --color-brand-coral: #ff5530;
  --color-brand-magenta: #ea5ec1;
  --color-brand-blue: #1456f0;
  --color-brand-blue-mid: #3b82f6;
  --color-brand-blue-deep: #1d4ed8;
  --color-brand-blue-700: #17437d;
  --color-brand-cyan: #3daeff;
  --color-brand-blue-200: #bfdbfe;
  --color-brand-purple: #a855f7;
  --color-canvas: #ffffff;
  --color-surface: #f7f8fa;
  --color-surface-soft: #f2f3f5;
  --color-hairline: #e5e7eb;
  --color-hairline-soft: #eaecf0;
  --color-ink: #0a0a0a;
  --color-ink-strong: #000000;
  --color-charcoal: #222222;
  --color-slate: #45515e;
  --color-steel: #5f5f5f;
  --color-stone: #8e8e93;
  --color-muted: #a8aab2;
  --color-success-bg: #e8ffea;
  --color-success-text: #1ba673;
  --color-on-dark: #ffffff;
  --color-footer-bg: #0a0a0a;
  --rounded-xs: 4px;
  --rounded-sm: 6px;
  --rounded-md: 8px;
  --rounded-lg: 12px;
  --rounded-xl: 16px;
  --rounded-xxl: 20px;
  --rounded-xxxl: 24px;
  --rounded-hero: 32px;
  --rounded-full: 9999px;
  --space-xxs: 4px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 20px;
  --space-xl: 24px;
  --space-xxl: 32px;
  --space-xxxl: 40px;
  --space-section-sm: 48px;
  --space-section: 64px;
  --space-section-lg: 80px;
  --space-hero: 96px;
  --font: "DM Sans", system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--color-ink);
  background: var(--color-canvas);
  font-size: 16px;
  line-height: 1.5;
}
a { color: var(--color-brand-blue-deep); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 1280px; margin: 0 auto; padding: 0 var(--space-xxl); }

.promo {
  background: var(--color-primary);
  color: var(--color-on-primary);
  text-align: center;
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 500;
}
.promo a { color: var(--color-on-primary); }

.header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--color-canvas);
  border-bottom: 1px solid var(--color-hairline-soft);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  min-height: 64px;
  flex-wrap: wrap;
}
.logo { font-size: 18px; font-weight: 600; color: var(--color-ink); letter-spacing: -0.4px; }
.logo:hover { text-decoration: none; }
.nav { display: flex; flex-wrap: wrap; gap: 8px 20px; flex: 1; }
.nav a { color: var(--color-charcoal); font-size: 14px; font-weight: 500; }
.nav a.on { color: var(--color-ink); font-weight: 600; }
.back { margin-left: auto; font-size: 13px; color: var(--color-steel); }

.hero {
  padding: var(--space-hero) 0 var(--space-section-lg);
  text-align: center;
}
.hero .eyebrow {
  display: inline-block;
  background: var(--color-brand-coral);
  color: var(--color-on-dark);
  font-size: 13px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--rounded-full);
  margin-bottom: 20px;
}
.hero h1 {
  font-size: 80px;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -2px;
  margin: 0 0 20px;
  color: var(--color-ink);
}
.hero p {
  margin: 0 auto 32px;
  color: var(--color-steel);
  font-size: 18px;
  font-weight: 500;
  max-width: 38em;
}
.hero-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; }

.btn, form button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  padding: 11px 24px;
  border: 1px solid var(--color-primary);
  border-radius: var(--rounded-full);
  cursor: pointer;
}
.btn:hover, form button:hover { text-decoration: none; background: var(--color-charcoal); color: var(--color-on-primary); }
.btn-secondary {
  background: transparent;
  color: var(--color-ink);
  border: 1px solid var(--color-ink);
}
.btn-secondary:hover { background: var(--color-surface); color: var(--color-ink); }
.btn-tertiary {
  background: var(--color-canvas);
  color: var(--color-ink);
  border: 1px solid var(--color-hairline);
}

.section { padding: var(--space-section-lg) 0; }
.section h2 {
  font-size: 40px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -1px;
  margin: 0 0 var(--space-xxl);
}
.muted { color: var(--color-charcoal); max-width: 46em; }

.grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }

.card {
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--rounded-xl);
  padding: var(--space-xl);
}
.card h3 { margin: 0 0 8px; font-size: 20px; font-weight: 600; }
.card p { margin: 0; color: var(--color-steel); font-size: 14px; }
.card.stat { text-align: center; border: 0; }
.card.stat h3 { font-size: 40px; letter-spacing: -1px; }

.product-card {
  border: 0;
  border-radius: var(--rounded-hero);
  padding: var(--space-xxl);
  min-height: 280px;
  color: var(--color-on-dark);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}
.product-card h3 {
  font-size: 40px;
  font-weight: 600;
  letter-spacing: -1px;
  color: var(--color-on-dark);
  margin: 0 0 8px;
}
.product-card p { color: rgba(255,255,255,0.8); }
.pc-coral { background: linear-gradient(160deg, #ff7a5c 0%, var(--color-brand-coral) 70%); }
.pc-magenta { background: linear-gradient(160deg, #f48ad4 0%, var(--color-brand-magenta) 70%); }
.pc-blue { background: linear-gradient(160deg, #3daeff 0%, var(--color-brand-blue) 70%); }
.pc-purple { background: linear-gradient(160deg, #c084fc 0%, var(--color-brand-purple) 70%); }
.pc-photo { background: var(--color-primary); }

.card-feature {
  background: var(--color-surface);
  border: 0;
  border-radius: var(--rounded-xl);
  padding: var(--space-xxl);
}

.promo-cta {
  background: var(--color-brand-coral);
  color: var(--color-on-dark);
  border-radius: var(--rounded-hero);
  padding: var(--space-section);
}
.promo-cta h2 { color: var(--color-on-dark); margin: 0 0 12px; }
.promo-cta p { color: rgba(255,255,255,0.9); }

.ph {
  background: var(--color-surface);
  color: var(--color-muted);
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  margin-bottom: 12px;
  border-radius: var(--rounded-lg);
}

.list { list-style: none; margin: 0; padding: 0; }
.list li { border-bottom: 1px solid var(--color-hairline-soft); padding: 16px 0; font-weight: 500; }
.list li:last-child { border-bottom: 0; }
.list .date { color: var(--color-steel); font-size: 13px; font-weight: 400; margin-right: 12px; }

table.data {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--color-hairline);
  border-radius: var(--rounded-md);
  overflow: hidden;
  font-size: 14px;
}
table.data th {
  background: var(--color-surface);
  color: var(--color-steel);
  font-size: 13px;
  font-weight: 600;
  text-align: left;
  padding: 12px 16px;
}
table.data td { padding: 16px; border-top: 1px solid var(--color-hairline-soft); }

form label { display: block; margin: 0 0 4px; font-size: 14px; font-weight: 500; }
form input, form textarea {
  width: 100%;
  max-width: 480px;
  height: 40px;
  padding: 12px 16px;
  border: 1px solid var(--color-hairline);
  background: var(--color-canvas);
  color: var(--color-ink);
  font: inherit;
  margin-bottom: 12px;
  border-radius: var(--rounded-md);
}
form textarea { height: auto; min-height: 110px; }
form input:focus, form textarea:focus {
  outline: none;
  border: 2px solid var(--color-brand-blue-deep);
}

.footer {
  background: var(--color-footer-bg);
  color: var(--color-on-dark);
  padding: var(--space-section) 0 var(--space-xxl);
  font-size: 14px;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(4, 1fr); gap: 32px; }
.footer h4 { margin: 0 0 12px; font-size: 14px; font-weight: 500; }
.footer a { color: var(--color-muted); display: block; padding: 4px 0; }
.footer .tag { color: var(--color-muted); margin: 8px 0 0; }

@media (max-width: 1024px) {
  .hero h1 { font-size: 56px; letter-spacing: -1.5px; }
  .grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .wrap { padding: 0 16px; }
  .hero h1 { font-size: 40px; letter-spacing: -1px; }
  .grid, .grid-3, .grid-2, .footer-grid { grid-template-columns: 1fr; }
}

.ph { overflow: hidden; }
.ph img { width: 100%; height: 100%; object-fit: cover; display: block; }