:root {
  --bg1: #060d1a;
  --bg2: #0c1f3d;
  --bg3: #12325f;
  --line: rgba(255, 255, 255, 0.12);
  --card: rgba(255, 255, 255, 0.05);
  --card-hi: rgba(255, 255, 255, 0.08);
  --text: #eaf2ff;
  --muted: #9fb4d4;
  --gold: #f5c451;
  --ok: #22c55e;
  --err: #ef4444;
  --accent1: #22d3ee;
  --accent2: #2563eb;
  /* accent ของ theme คอร์ส AI (โทนม่วง-คราม) */
  --c-accent1: #a78bfa;
  --c-accent2: #6366f1;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  color: var(--text);
  font-family: "Segoe UI", Tahoma, "Noto Sans Thai", sans-serif;
  line-height: 1.6;
  background:
    radial-gradient(circle at 12% 18%, #1d4ed833 0, transparent 42%),
    radial-gradient(circle at 88% 12%, #06b6d433 0, transparent 40%),
    radial-gradient(circle at 50% 100%, #7c3aed22 0, transparent 55%),
    linear-gradient(160deg, var(--bg1), var(--bg2) 55%, var(--bg1));
  background-attachment: fixed;
}

a {
  color: var(--accent1);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

h1,
h2,
h3 {
  line-height: 1.2;
  margin: 0 0 0.4em;
}

.container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}

.btn {
  display: inline-block;
  border: 0;
  border-radius: 10px;
  padding: 12px 22px;
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  color: #04121f;
  background: linear-gradient(120deg, var(--accent1), var(--accent2));
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: 0 8px 24px #22d3ee33;
}
.btn.secondary {
  color: var(--text);
  background: var(--card-hi);
  border: 1px solid var(--line);
}
/* ปุ่มโทนคอร์ส AI (ม่วง-คราม) */
.btn.alt {
  color: #fff;
  background: linear-gradient(120deg, var(--c-accent1), var(--c-accent2));
}
.btn.alt:hover {
  box-shadow: 0 8px 24px #6366f155;
}

.section {
  padding: 56px 0;
}
.section h2 {
  font-size: 26px;
}
.eyebrow {
  color: var(--gold);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 12px;
  font-weight: 700;
}

/* Rendered markdown (news articles / content pages) */
.prose {
  color: var(--text);
  font-size: 16px;
  line-height: 1.8;
}
.prose h1,
.prose h2,
.prose h3 {
  margin: 1.4em 0 0.5em;
  line-height: 1.3;
}
.prose h2 {
  font-size: 22px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.3em;
}
.prose h3 {
  font-size: 18px;
  color: var(--gold);
}
.prose p {
  margin: 0.8em 0;
}
.prose a {
  color: var(--accent1);
}
.prose ul,
.prose ol {
  margin: 0.8em 0;
  padding-left: 1.4em;
}
.prose li {
  margin: 0.3em 0;
}
.prose code {
  background: #ffffff14;
  padding: 2px 6px;
  border-radius: 5px;
  font-size: 0.9em;
}
.prose pre {
  background: #0a1b33;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px;
  overflow-x: auto;
}
.prose pre code {
  background: none;
  padding: 0;
}
.prose blockquote {
  margin: 1em 0;
  padding: 6px 16px;
  border-left: 3px solid var(--gold);
  background: var(--card);
  color: var(--muted);
}
.prose img {
  max-width: 100%;
  border-radius: 12px;
}
.prose hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 1.6em 0;
}
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
}
.prose th,
.prose td {
  border: 1px solid var(--line);
  padding: 8px 12px;
  text-align: left;
}
.prose th {
  background: var(--card-hi);
}