:root {
  --primary: #D9F99D;
  --primary-dark: #BEF264;
  --accent-text: #1A2E05;
  --background: #FFFFFF;
  --surface: #FFFFFF;
  --surface-secondary: #FAFBFC;
  --text-primary: #111827;
  --text-secondary: #6B7280;
  --text-muted: #9CA3AF;
  --border: #F1F5F9;
  --danger: #DC2626;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 20px;
  --space-xl: 24px;
  --space-xxl: 32px;
  color-scheme: light;
}

* { box-sizing: border-box; }

html {
  background: var(--background);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
}

body { margin: 0; background: var(--background); }

a {
  color: var(--text-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover { text-decoration-color: var(--accent-text); }

.shell {
  width: min(880px, calc(100% - 40px));
  margin: 0 auto;
  padding: 56px 0 32px;
}

.brand {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 40px;
}

.brand img {
  width: 48px;
  height: 48px;
  border-radius: 12px;
}

.brand-copy strong {
  display: block;
  font-size: 17px;
  line-height: 1.35;
}

.brand-copy span {
  display: block;
  margin-top: 3px;
  color: var(--text-secondary);
  font-size: 14px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--primary);
  color: var(--accent-text);
  font-size: 13px;
  font-weight: 600;
}

h1 {
  margin: 14px 0 8px;
  font-size: clamp(30px, 7vw, 44px);
  line-height: 1.18;
  letter-spacing: -0.03em;
}

.lead {
  margin: 0;
  max-width: 680px;
  color: var(--text-secondary);
  font-size: 17px;
}

.panel {
  margin-top: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  padding: 24px;
}

.panel h2 {
  margin: 0 0 14px;
  font-size: 19px;
  line-height: 1.4;
}

.panel h3 {
  margin: 24px 0 8px;
  font-size: 16px;
}

.panel p { margin: 10px 0; }
.panel ul { padding-left: 22px; }
.panel li + li { margin-top: 6px; }

.link-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 24px;
}

.link-card {
  display: block;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px;
  text-decoration: none;
  background: var(--surface-secondary);
}

.link-card strong { display: block; font-size: 16px; }
.link-card span {
  display: block;
  margin-top: 4px;
  color: var(--text-secondary);
  font-size: 14px;
}

.note {
  margin-top: 18px;
  padding: 14px 16px;
  border-left: 4px solid var(--primary-dark);
  border-radius: var(--radius-sm);
  background: var(--surface-secondary);
  color: var(--text-secondary);
  font-size: 14px;
}

.todo {
  border-left-color: var(--danger);
}

.meta {
  margin-top: 24px;
  color: var(--text-muted);
  font-size: 13px;
}

footer {
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 13px;
}

footer p { margin: 4px 0; }

@media (max-width: 640px) {
  .shell {
    width: min(100% - 32px, 880px);
    padding-top: 32px;
  }

  .brand { margin-bottom: 28px; }
  .link-grid { grid-template-columns: 1fr; }
  .panel { padding: 20px; }
}