:root {
  --color-primary: #0066cc;
  --color-primary-focus: #0071e3;
  --color-primary-on-dark: #2997ff;
  --color-ink: #1d1d1f;
  --color-body: #1d1d1f;
  --color-body-on-dark: #ffffff;
  --color-body-muted: #cccccc;
  --color-ink-muted-80: #333333;
  --color-ink-muted-48: #7a7a7a;
  --color-divider-soft: #f0f0f0;
  --color-hairline: #e0e0e0;
  --color-canvas: #ffffff;
  --color-canvas-parchment: #f5f5f7;
  --color-surface-pearl: #fafafc;
  --color-surface-tile-1: #272729;
  --color-surface-tile-2: #2a2a2c;
  --color-surface-tile-3: #252527;
  --color-surface-black: #000000;
  --color-surface-chip-translucent: #d2d2d7;
  --color-on-primary: #ffffff;
  --color-on-dark: #ffffff;
  --font-display: "SF Pro Display", system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-text: "SF Pro Text", system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --rounded-none: 0px;
  --rounded-xs: 5px;
  --rounded-sm: 8px;
  --rounded-md: 11px;
  --rounded-lg: 18px;
  --rounded-pill: 9999px;
  --rounded-full: 9999px;
  --space-xxs: 4px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 17px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-xxl: 48px;
  --space-section: 80px;
  --product-shadow: rgba(0, 0, 0, 0.22) 3px 5px 30px 0;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--font-text);
  color: var(--color-ink);
  background: var(--color-canvas);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.47;
  letter-spacing: -0.374px;
}
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 980px; margin: 0 auto; padding: 0 24px; }
.wrap-wide { max-width: 1440px; margin: 0 auto; padding: 0 24px; }

.header {
  background: var(--color-surface-black);
  position: sticky;
  top: 0;
  z-index: 30;
}
.header-inner {
  max-width: 1024px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 44px;
  padding: 0 16px;
  flex-wrap: wrap;
}
.logo {
  font-family: var(--font-text);
  font-weight: 400;
  color: var(--color-on-dark);
  font-size: 17px;
  letter-spacing: -0.2px;
}
.logo:hover { text-decoration: none; }
.nav { display: flex; flex-wrap: wrap; gap: 20px; flex: 1; justify-content: center; }
.nav a {
  color: rgba(255,255,255,0.8);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: -0.12px;
  line-height: 1;
}
.nav a:hover { text-decoration: none; color: var(--color-on-dark); }
.nav a.on { color: var(--color-on-dark); }
.back { margin-left: auto; font-size: 12px; color: var(--color-body-muted); }

.subnav {
  background: rgba(245, 245, 247, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0,0,0,0.08);
}
.subnav-inner {
  max-width: 980px;
  margin: 0 auto;
  min-height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}
.subnav strong {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: 0.231px;
  color: var(--color-ink);
}
.subnav a.buy {
  background: var(--color-primary);
  color: var(--color-on-primary);
  border-radius: var(--rounded-pill);
  padding: 6px 14px;
  font-size: 12px;
}
.subnav a.buy:hover { text-decoration: none; color: var(--color-on-primary); }

.hero, .tile {
  padding: var(--space-section) 0;
  text-align: center;
}
.tile-light { background: var(--color-canvas); color: var(--color-ink); }
.tile-parchment { background: var(--color-canvas-parchment); color: var(--color-ink); }
.tile-dark { background: var(--color-surface-tile-1); color: var(--color-on-dark); }
.tile-dark-2 { background: var(--color-surface-tile-2); color: var(--color-on-dark); }
.tile-dark-3 { background: var(--color-surface-tile-3); color: var(--color-on-dark); }
.hero h1, .tile h1, .tile h2 {
  font-family: var(--font-display);
  font-size: 56px;
  font-weight: 600;
  line-height: 1.07;
  letter-spacing: -0.28px;
  margin: 0 0 8px;
}
.tile h2 { font-size: 40px; line-height: 1.1; letter-spacing: 0; }
.hero p, .tile p.lead {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 400;
  line-height: 1.14;
  letter-spacing: 0.196px;
  margin: 0 auto 24px;
  max-width: 22em;
}
.tile p { margin: 0 auto 24px; max-width: 36em; }
.tile-dark a, .tile-dark-2 a, .tile-dark-3 a { color: var(--color-primary-on-dark); }
.cta-row { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; margin-bottom: 40px; }

.section { padding: var(--space-section) 0; }
.section h2 {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 600;
  margin: 0 0 24px;
  text-align: center;
}
.muted { color: var(--color-ink-muted-80); }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

.card {
  background: var(--color-canvas);
  border-radius: var(--rounded-lg);
  padding: 24px;
  border: 1px solid var(--color-hairline);
}
.card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.374px;
}
.card p { margin: 0; color: var(--color-ink-muted-80); font-size: 14px; }

.ph {
  background: var(--color-canvas-parchment);
  color: var(--color-ink-muted-48);
  height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  margin: 0 auto 0;
  max-width: 520px;
  border-radius: var(--rounded-sm);
  box-shadow: var(--product-shadow);
}
.tile-dark .ph, .tile-dark-2 .ph, .tile-dark-3 .ph {
  background: var(--color-surface-tile-3);
  color: var(--color-body-muted);
}

.list { list-style: none; margin: 0; padding: 0; max-width: 720px; margin-inline: auto; }
.list li {
  border-bottom: 1px solid var(--color-hairline);
  padding: 16px 0;
  display: flex;
  gap: 16px;
  font-size: 17px;
}
.list .date { color: var(--color-ink-muted-48); min-width: 7em; font-size: 14px; }

form { text-align: left; max-width: 480px; margin: 0 auto; }
form label { display: block; margin: 0 0 4px; font-size: 14px; }
form input, form textarea {
  width: 100%; padding: 12px 20px; height: 44px;
  border: 1px solid rgba(0,0,0,0.08); border-radius: var(--rounded-pill);
  font: inherit; margin-bottom: 12px; background: var(--color-canvas);
}
form textarea { height: auto; border-radius: var(--rounded-lg); }
form button, .btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 11px 22px; border: 0;
  background: var(--color-primary); color: var(--color-on-primary);
  font: inherit; font-size: 17px; font-weight: 400;
  cursor: pointer; border-radius: var(--rounded-pill);
}
.btn:hover { text-decoration: none; color: var(--color-on-primary); }
.btn:active { transform: scale(0.95); }
.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}
.btn-ghost:hover { color: var(--color-primary); }
.tile-dark .btn-ghost, .tile-dark-2 .btn-ghost {
  color: var(--color-primary-on-dark);
  border-color: var(--color-primary-on-dark);
}

.footer {
  background: var(--color-canvas-parchment);
  padding: 64px 0 40px;
  color: var(--color-ink-muted-80);
  font-size: 12px;
  letter-spacing: -0.12px;
}
.footer a { color: var(--color-ink-muted-80); display: block; line-height: 2.41; font-size: 17px; }
.footer-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 32px; }
.footer h3 { font-size: 14px; font-weight: 600; margin: 0; color: var(--color-ink); }
.footer p { margin: 0 0 4px; color: var(--color-ink-muted-48); }

@media (max-width: 720px) {
  .grid, .grid-2, .footer-cols { grid-template-columns: 1fr; }
  .hero h1, .tile h1 { font-size: 34px; }
  .tile h2 { font-size: 28px; }
  .hero p, .tile p.lead { font-size: 21px; }
}

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