:root {
  --bg: #f2f6fb;
  --surface: #ffffff;
  --ink: #173243;
  --muted: #4f6675;
  --line: #d7e1ea;
  --brand: #0d8d88;
  --brand-strong: #0a5e67;
  --btn: #118cc4;
  --shadow: 0 12px 28px rgba(17, 44, 70, 0.1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Prompt", "Kanit", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(900px 420px at -10% -10%, rgba(13, 141, 136, 0.1), transparent 60%),
    radial-gradient(800px 420px at 120% -20%, rgba(17, 140, 196, 0.1), transparent 60%),
    var(--bg);
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 22px 16px 56px;
}

.hero {
  border-radius: 18px;
  background: linear-gradient(135deg, #0f3051, #0d596b 58%, #0d7f7b);
  color: #edf8ff;
  padding: 20px;
  box-shadow: var(--shadow);
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.6rem, 3.8vw, 2.5rem);
}

.hero p {
  margin: 8px 0 0;
  color: #d5eaf6;
}

.actions {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  border-radius: 10px;
  border: 1px solid transparent;
  padding: 10px 14px;
  font-weight: 650;
  transition: transform .12s ease, box-shadow .12s ease;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(14, 42, 66, 0.22);
}

.btn-primary {
  background: linear-gradient(135deg, #0bb3a5, #1388cf);
  color: #fff;
}

.btn-secondary {
  background: #f7fbff;
  color: var(--ink);
  border-color: var(--line);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.12);
  color: #eef8ff;
  border-color: rgba(255, 255, 255, 0.32);
}

.panel {
  margin-top: 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px;
  box-shadow: 0 8px 20px rgba(17, 44, 67, 0.08);
}

.panel h2 {
  margin: 0 0 8px;
  font-size: 1.22rem;
}

.panel .sub {
  margin: 0;
  color: var(--muted);
  font-size: .95rem;
}

.card-grid {
  margin-top: 10px;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.card {
  background: #fbfdff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 1.02rem;
  color: var(--brand-strong);
}

.card p,
.card ul,
.card ol {
  margin: 0;
}

.card ul,
.card ol {
  padding-left: 18px;
}

.card li {
  margin: 4px 0;
}

figure {
  margin: 10px 0 0;
}

figure img {
  width: 100%;
  display: block;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #0a1020;
}

figcaption {
  margin-top: 6px;
  font-size: .84rem;
  color: var(--muted);
}

.toc {
  margin-top: 14px;
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.toc a {
  display: block;
  text-decoration: none;
  background: #f7fbff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 9px 10px;
  color: var(--ink);
  font-size: .95rem;
}

.step-nav {
  margin-top: 12px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 8px;
  font-size: .94rem;
}

.table th,
.table td {
  border: 1px solid var(--line);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}

.table th {
  background: #f3f9ff;
}

.note {
  margin-top: 10px;
  background: #f2f9ff;
  border: 1px solid #cee0ee;
  border-radius: 10px;
  padding: 10px 12px;
  font-size: .92rem;
}

.warn {
  margin-top: 10px;
  background: #fff8e9;
  border: 1px solid #eed7a5;
  color: #885b08;
  border-radius: 10px;
  padding: 10px 12px;
  font-size: .92rem;
}

footer {
  margin-top: 16px;
  text-align: center;
  color: #607483;
  font-size: .86rem;
}

@media (max-width: 720px) {
  .container {
    padding: 14px 10px 40px;
  }
}