:root {
  --bg: #f4f7fb;
  --panel: #ffffff;
  --ink: #0f172a;
  --muted: #475569;
  --line: #d4dbe7;
  --brand: #0b5f99;
  --brand-soft: #e3f2fe;
  --shadow: 0 16px 36px rgba(15, 23, 42, 0.12);
}

* { box-sizing: border-box; }

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Space Grotesk", "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(900px 340px at 10% 0%, #dbeafe, transparent 60%),
    radial-gradient(900px 300px at 90% -10%, #cffafe, transparent 62%),
    var(--bg);
  line-height: 1.55;
}

.container {
  width: min(960px, 94vw);
  margin: 28px auto 40px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.brand {
  color: var(--ink);
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.2px;
  font-size: 1.1rem;
}

.meta {
  color: var(--muted);
  font-size: 0.92rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 1.2rem 1.3rem;
}

h1,
h2,
h3 {
  margin: 0 0 0.6rem;
  line-height: 1.2;
}

h1 {
  font-size: clamp(1.7rem, 4.2vw, 2.35rem);
}

h2 {
  margin-top: 1.2rem;
  font-size: 1.15rem;
}

p,
li {
  color: #1f2937;
}

ul {
  margin: 0.3rem 0 0.8rem 1.2rem;
  padding: 0;
}

.muted {
  color: var(--muted);
}

.note {
  border: 1px solid #bfdbfe;
  background: var(--brand-soft);
  color: #1e3a8a;
  border-radius: 12px;
  padding: 0.7rem 0.8rem;
  margin-top: 0.9rem;
}

.actions {
  margin-top: 1rem;
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #0369a1;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 700;
  background: var(--brand);
  color: #fff;
  padding: 0.55rem 0.88rem;
}

.btn.ghost {
  background: #fff;
  color: #0f172a;
  border-color: var(--line);
}