:root {
  color-scheme: light;
  --ink: #172b3b;
  --muted: #5e7180;
  --paper: #f5f8fa;
  --white: #fff;
  --line: #dce6ec;
  --accent: #007b83;
  --accent-dark: #07535e;
  --blue: #e8f2f5;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.65 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

.site-header { background: var(--white); border-bottom: 1px solid var(--line); }
.header-inner, .footer-inner { width: min(1120px, calc(100% - 40px)); margin: auto; }
.header-inner { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { color: var(--ink); font-size: 17px; font-weight: 750; text-decoration: none; white-space: nowrap; }
.brand span { color: var(--muted); font-size: 14px; font-weight: 500; margin-left: 8px; }
nav { display: flex; flex-wrap: wrap; gap: 26px; }
nav a { color: var(--muted); font-size: 14px; text-decoration: none; }
nav a:hover { color: var(--accent-dark); }

.page-content { width: min(1120px, calc(100% - 40px)); min-height: calc(100vh - 150px); margin: auto; padding: 54px 0 72px; }
.page-content img { max-width: 100%; height: auto; }
.page-content table { display: block; max-width: 100%; overflow-x: auto; border-collapse: collapse; }
.page-content th, .page-content td { padding: 8px 10px; border-bottom: 1px solid var(--line); text-align: left; }
.page-content :not(pre) > code { padding: .14em .38em; border: 1px solid #d5e2e8; border-radius: 5px; background: #eaf1f5; color: #174f68; font: .9em/1.4 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; white-space: nowrap; }
.page-content pre { max-width: 100%; margin: 1.25em 0; padding: 18px 20px; overflow-x: auto; border: 1px solid #243d4c; border-radius: 10px; background: #102532; color: #e7f1f5; font: 14px/1.65 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; tab-size: 2; }
.page-content pre code { color: inherit; font: inherit; }
.highlight { margin: 1.25em 0; }
.highlight pre { margin: 0; }
.highlight .c, .highlight .c1, .highlight .cm, .highlight .cp { color: #8ca3ae; font-style: italic; }
.highlight .na, .highlight .nt, .highlight .nc { color: #79d5e8; }
.highlight .pi, .highlight .p, .highlight .o { color: #bed0d8; }
.highlight .s, .highlight .s1, .highlight .s2, .highlight .sr { color: #a9df9b; }
.highlight .m, .highlight .mi, .highlight .mf, .highlight .mh { color: #d9b8ff; }
.highlight .k, .highlight .kc, .highlight .kd, .highlight .kn, .highlight .kp, .highlight .kr { color: #f2c879; }
.highlight .nv, .highlight .nb, .highlight .no, .highlight .nl { color: #ffad91; }
.highlight .err { color: #ff9b9b; background: transparent; }
.hero { padding: 58px clamp(24px, 6vw, 76px); border-radius: 18px; background: linear-gradient(120deg, #e2f0f2, #eff4f8 70%, #e8eff7); }
.eyebrow, .card-index { color: var(--accent-dark); font-size: 12px; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; }
h1, h2, p { margin-top: 0; }
h1 { max-width: 760px; margin-bottom: 18px; font-size: clamp(34px, 5vw, 54px); line-height: 1.12; letter-spacing: -.035em; }
.hero-lead { max-width: 680px; margin-bottom: 30px; color: #405967; font-size: 18px; }
.button { display: inline-flex; align-items: center; gap: 18px; padding: 12px 18px; border-radius: 8px; background: var(--accent-dark); color: #fff; font-weight: 650; text-decoration: none; }
.button:hover { background: var(--accent); color: #fff; }
.intro { max-width: 750px; padding: 48px 0 24px; }
.intro h2 { margin-bottom: 8px; font-size: 25px; }
.intro p, .card p, .notice p { color: var(--muted); }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card { display: flex; min-height: 235px; flex-direction: column; align-items: flex-start; padding: 25px; border: 1px solid var(--line); border-radius: 12px; background: var(--white); text-decoration: none; transition: transform .15s ease, border-color .15s ease; }
.card:hover { transform: translateY(-3px); border-color: #9ebec4; }
.card h2 { margin: 19px 0 7px; color: var(--ink); font-size: 23px; }
.card p { margin-bottom: 20px; }
.card-link { margin-top: auto; color: var(--accent-dark); font-size: 14px; font-weight: 700; }
.notice { margin-top: 35px; padding: 22px 25px; border-left: 4px solid var(--accent); border-radius: 0 8px 8px 0; background: var(--white); }
.notice p { margin: 6px 0 0; }
.license-note { margin: 24px 0 0; color: var(--muted); font-size: 13px; }
.site-footer { border-top: 1px solid var(--line); background: var(--white); }
.footer-inner { display: flex; justify-content: space-between; gap: 20px; padding: 20px 0; color: var(--muted); font-size: 13px; }

@media (max-width: 760px) {
  .header-inner { align-items: flex-start; flex-direction: column; justify-content: center; padding: 15px 0; gap: 12px; }
  nav { gap: 16px; }
  .page-content { padding-top: 30px; }
  .hero { padding: 36px 26px; }
  .cards { grid-template-columns: 1fr; }
  .card { min-height: 190px; }
  .footer-inner { flex-direction: column; }
}