:root {
  --color-primary: #000000;
  --color-primary-active: #1a1a1a;
  --color-text-link: #0d74ce;
  --color-text-link-secondary: #476cff;
  --color-ink: #171717;
  --color-body: #60646c;
  --color-body-strong: #171717;
  --color-muted: #999999;
  --color-muted-soft: #cccccc;
  --color-hairline: #f0f0f3;
  --color-hairline-soft: #f5f5f7;
  --color-hairline-strong: #dcdee0;
  --color-canvas: #ffffff;
  --color-canvas-soft: #fafafa;
  --color-surface-card: #ffffff;
  --color-surface-strong: #f0f0f3;
  --color-surface-dark: #171717;
  --color-surface-dark-elevated: #1a1a1a;
  --color-on-primary: #ffffff;
  --color-on-dark: #ffffff;
  --color-on-dark-soft: #b0b4ba;
  --color-gradient-sky-light: #cfe7ff;
  --color-gradient-sky-mid: #a8c8e8;
  --color-accent-warning: #ab6400;
  --color-accent-preview: #8145b5;
  --color-accent-link-bright: #47c2ff;
  --color-semantic-error: #eb8e90;
  --color-semantic-success: #16a34a;
  --rounded-none: 0px;
  --rounded-xs: 4px;
  --rounded-sm: 6px;
  --rounded-md: 8px;
  --rounded-lg: 12px;
  --rounded-xl: 16px;
  --rounded-xxl: 24px;
  --rounded-pill: 9999px;
  --rounded-full: 9999px;
  --space-xxs: 4px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-base: 16px;
  --space-md: 20px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-xxl: 48px;
  --space-section: 96px;
  --font-display: Inter, system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: Inter, system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", ui-monospace, "Segoe UI", "PingFang SC", "Microsoft YaHei", monospace;
  --shadow-soft: 0 4px 12px rgba(0, 0, 0, 0.04);
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: var(--font-body);
  color: var(--color-ink);
  background: var(--color-canvas);
  font-size: 16px;
  line-height: 1.5;
}
a { color: var(--color-text-link); text-decoration: none; }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 48px; }

.site-header {
  height: 64px;
  background: var(--color-canvas);
  position: sticky;
  top: 0;
  z-index: 20;
}
.header-inner { height: 64px; display: flex; align-items: center; gap: 28px; }
.logo {
  font-weight: 600;
  font-size: 18px;
  letter-spacing: -0.4px;
  color: var(--color-ink);
}
.nav { display: flex; gap: 22px; flex: 1; }
.nav a { color: var(--color-ink); font-size: 14px; font-weight: 500; }
.nav a.on { color: var(--color-ink); }
.header-actions { display: flex; align-items: center; gap: 10px; margin-left: auto; }
.back { font-size: 13px; color: var(--color-muted); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  border: 0;
  cursor: pointer;
  border-radius: var(--rounded-md);
  padding: 10px 18px;
  height: 40px;
  text-decoration: none;
}
.btn-primary { background: var(--color-primary); color: var(--color-on-primary); }
.btn-primary:active { background: var(--color-primary-active); }
.btn-secondary {
  background: var(--color-surface-card);
  color: var(--color-ink);
  box-shadow: inset 0 0 0 1px var(--color-hairline-strong);
  padding: 9px 17px;
}
.btn-text { background: transparent; color: var(--color-text-link); height: auto; padding: 0; }

.hero {
  padding: 96px 0 48px;
  text-align: center;
  background:
    radial-gradient(ellipse at 50% 0%, var(--color-gradient-sky-light) 0%, rgba(168, 200, 232, 0.35) 28%, transparent 62%),
    var(--color-canvas);
}
.eyebrow {
  display: inline-flex;
  background: var(--color-surface-strong);
  color: var(--color-ink);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  border-radius: var(--rounded-pill);
  padding: 4px 10px;
  margin-bottom: 16px;
}
.hero h1 {
  font-size: 64px;
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -1.92px;
  margin: 0 auto 16px;
  max-width: 16ch;
}
.hero p { margin: 0 auto 24px; color: var(--color-body); max-width: 40em; }

.devices {
  display: flex;
  justify-content: center;
  align-items: flex-end;
  gap: 16px;
  margin-top: 48px;
}
.laptop {
  width: min(640px, 70%);
  background: var(--color-surface-card);
  border: 1px solid var(--color-hairline-strong);
  border-radius: var(--rounded-xl);
  overflow: hidden;
  text-align: left;
}
.laptop-bar {
  height: 28px;
  background: var(--color-canvas-soft);
  border-bottom: 1px solid var(--color-hairline);
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 12px;
}
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--color-hairline-strong); }
.laptop-screen {
  background: var(--color-surface-dark);
  color: var(--color-on-dark);
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 20px;
  min-height: 180px;
}
.phone {
  width: 120px;
  height: 220px;
  background: var(--color-surface-card);
  border: 1px solid var(--color-hairline-strong);
  border-radius: 20px;
  padding: 10px 8px;
  margin-bottom: -8px;
}
.phone-screen {
  height: 100%;
  background: var(--color-surface-strong);
  border-radius: 12px;
  color: var(--color-muted);
  font-size: 11px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-hero { padding: 72px 0 32px; }
.page-hero h1 {
  font-size: 48px;
  font-weight: 600;
  letter-spacing: -1.44px;
  line-height: 1.1;
  margin: 0 0 12px;
}
.page-hero p { margin: 0; color: var(--color-body); max-width: 40em; }

.band { padding: 96px 0; }
.band-soft { background: var(--color-canvas-soft); }
.band h2 {
  font-size: 36px;
  font-weight: 600;
  letter-spacing: -1.08px;
  margin: 0 0 12px;
}
.lead { color: var(--color-body); margin: 0 0 32px; max-width: 40em; }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.stat {
  background: var(--color-surface-card);
  border: 1px solid var(--color-hairline-strong);
  border-radius: var(--rounded-lg);
  padding: 24px;
}
.stat h3 { margin: 0 0 6px; font-size: 28px; font-weight: 600; letter-spacing: -0.8px; }
.stat p { margin: 0; color: var(--color-body); }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.card {
  background: var(--color-surface-card);
  border: 1px solid var(--color-hairline-strong);
  border-radius: var(--rounded-lg);
  padding: 24px;
}
.card.dark {
  background: var(--color-surface-dark);
  color: var(--color-on-dark);
  border-color: var(--color-surface-dark);
}
.card h3 { margin: 0 0 8px; font-size: 18px; font-weight: 600; }
.card p { margin: 0; color: var(--color-body); }
.card.dark p { color: var(--color-on-dark-soft); }
.ph {
  background: var(--color-surface-strong);
  color: var(--color-muted);
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  margin: -24px -24px 18px;
  border-radius: var(--rounded-lg) var(--rounded-lg) 0 0;
}

.step {
  background: var(--color-surface-card);
  border: 1px solid var(--color-hairline-strong);
  border-radius: var(--rounded-lg);
  padding: 20px;
}
.step-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--rounded-md);
  background: var(--color-surface-strong);
  margin-bottom: 12px;
}
.step h3 { margin: 0 0 6px; font-size: 16px; font-weight: 600; }
.step p { margin: 0; color: var(--color-body); font-size: 14px; }

.eco {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 12px;
}
.tile {
  width: 64px;
  height: 64px;
  border-radius: var(--rounded-md);
  background: var(--color-surface-card);
  border: 1px solid var(--color-hairline);
}

.code {
  background: var(--color-surface-dark);
  color: var(--color-on-dark);
  font-family: var(--font-mono);
  font-size: 13px;
  border-radius: var(--rounded-lg);
  padding: 20px;
}

.tier {
  background: var(--color-surface-card);
  border: 1px solid var(--color-hairline-strong);
  border-radius: var(--rounded-lg);
  padding: 32px;
}
.tier.featured { background: var(--color-surface-dark); color: var(--color-on-dark); border-color: var(--color-surface-dark); }
.tier h3 { margin: 0 0 8px; font-size: 18px; font-weight: 600; }
.tier .price { font-size: 28px; font-weight: 600; margin: 0 0 16px; }
.tier ul { margin: 0 0 20px; padding-left: 18px; color: var(--color-body); }
.tier.featured ul { color: var(--color-on-dark-soft); }

.list { list-style: none; margin: 0; padding: 0; }
.list li {
  display: flex;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-hairline);
}
.list .date { color: var(--color-muted); font-family: var(--font-mono); font-size: 13px; min-width: 108px; }

.cta-band { padding: 96px 0; text-align: center; }
.cta-band h2 { font-size: 36px; font-weight: 600; letter-spacing: -1.08px; margin: 0 0 16px; }

form label { display: block; margin: 0 0 8px; font-size: 14px; font-weight: 600; }
form input, form textarea {
  width: 100%;
  max-width: 480px;
  padding: 12px 16px;
  height: 44px;
  border: 1px solid var(--color-hairline-strong);
  border-radius: var(--rounded-md);
  font: inherit;
  margin-bottom: 16px;
  background: var(--color-surface-card);
  color: var(--color-ink);
}
form textarea { height: auto; }
form input:focus, form textarea:focus {
  outline: none;
  border: 2px solid var(--color-ink);
  padding: 11px 15px;
}

.site-footer {
  padding: 64px 0 32px;
  color: var(--color-body);
  font-size: 14px;
  border-top: 1px solid var(--color-hairline);
}
.footer-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; margin-bottom: 32px; }
.footer-grid h4 { margin: 0 0 10px; color: var(--color-ink); font-size: 12px; font-weight: 600; }
.footer-grid a { display: block; padding: 4px 0; color: var(--color-body); }
.legal p { margin: 0 0 4px; color: var(--color-muted); font-size: 13px; }

@media (max-width: 900px) {
  .wrap { padding: 0 20px; }
  .hero h1 { font-size: 32px; }
  .devices { flex-direction: column; align-items: center; }
  .laptop { width: 100%; }
  .phone { display: none; }
  .grid-3, .grid-2, .stats, .footer-grid, .eco { grid-template-columns: 1fr 1fr; }
  .nav { display: none; }
  .band { padding: 64px 0; }
}

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