:root{
  --bg:#f4f7fb;--ink:#102846;--line:#d5e1ed;--navy:#123f6a;--blue:#2478c9;
  --shadow:0 13px 34px rgba(17,43,75,.09)
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;color:var(--ink)}
.shell{max-width:1200px;margin:auto;padding:16px}
.topbar{background:var(--navy);color:#fff;border-radius:18px;padding:18px 20px;display:flex;justify-content:space-between;gap:18px;align-items:center;box-shadow:var(--shadow)}
.topbar h1{margin:0;font-size:28px;letter-spacing:-.03em}
.topbar p{margin:4px 0 0;opacity:.85}
.pill{background:#e7f6ef;color:#145e40;padding:8px 12px;border-radius:999px;font-size:12px;font-weight:800}
.hero{display:grid;grid-template-columns:1.25fr .75fr;gap:18px;margin-top:18px}
.card{background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:22px}
.kicker{display:inline-flex;border-radius:999px;background:#e6f3ff;color:#1762a5;padding:6px 9px;font-size:11px;font-weight:900;letter-spacing:.05em}
.intro h2{font-size:42px;line-height:1.03;letter-spacing:-.04em;margin:10px 0 12px}
.intro p,.activity p{color:#4b637b;line-height:1.65}
.note{margin-top:14px;border:1px solid #d7e5f1;border-radius:16px;background:#f8fbfe;padding:14px}
.note ul{margin:8px 0 0 18px;padding:0}
.checklist{margin:0;padding-left:20px;line-height:1.8;color:#45607a}
.cards{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:18px}
.activity .tag{display:inline-flex;padding:6px 10px;border-radius:999px;background:#eaf8f1;color:#166246;font-size:11px;font-weight:900}
.activity .tag.alt{background:#f3ebff;color:#6d49a3}
.activity h3{margin:14px 0 10px;font-size:28px;letter-spacing:-.02em}
.meta{font-size:13px;color:#5a7086;margin:10px 0 16px}
.btn{display:inline-block;padding:12px 16px;border-radius:12px;background:var(--blue);color:#fff;font-weight:900;text-decoration:none}
.routes{margin-top:18px}
.routes h3{margin-top:0}
table{width:100%;border-collapse:collapse}
th,td{text-align:left;padding:12px 10px;border-bottom:1px solid #e0e8f0}
code{background:#f1f5f9;padding:2px 6px;border-radius:6px}
.footer{display:flex;justify-content:space-between;gap:10px;color:#7890a7;font-size:12px;padding:16px 4px 6px}
@media (max-width:900px){.hero,.cards{grid-template-columns:1fr}}
@media (max-width:640px){.shell{padding:10px}.topbar{display:block}.intro h2{font-size:34px}.footer{display:block}}