/* Siam Agents — tokens from BRAND.md / assets/tokens.json */
:root {
  --surface: #F3F4F7;
  --surface-raised: #FBFBFD;
  --ink: #161B33;
  --ink-muted: #4A5170;
  --kram: #23357A;
  --kram-tint: #DDE2F3;
  --rong: #E8A317;
  --tangchae: #2F7F72;
  --chad: #B83A26;
  --line: #D8DBE5;

  --wordmark: var(--kram);
  --font-display: "Anuphan", "Noto Sans Thai", Tahoma, system-ui, sans-serif;
  --font-sans: "Anuphan", "Noto Sans Thai", Tahoma, system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;

  --radius-sm: 2px;
  --radius-md: 6px;
  --radius-lg: 12px;
  --wrap: 1120px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --wordmark: var(--ink);
    --surface: #121931;
    --surface-raised: #1A2342;
    --ink: #EEF0F7;
    --ink-muted: #A9B0C8;
    --kram: #8C9EE8;
    --kram-tint: #2A3A7A;
    --tangchae: #5FB3A4;
    --chad: #E2735F;
    --line: #2C365A;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--surface);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 28px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--kram); }
img, svg { display: block; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

h1, h2, h3 { font-family: var(--font-display); font-weight: 600; margin: 0; }
h1 { font-size: 52px; line-height: 1.3; font-weight: 700; }
h2 { font-size: 32px; line-height: 42px; }
h3 { font-size: 22px; line-height: 32px; }
p { margin: 0; }

.label {
  font-size: 12px; line-height: 16px; font-weight: 600;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-muted);
}
.lede { color: var(--ink-muted); font-size: 18px; line-height: 30px; max-width: 640px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font: 600 16px/1 var(--font-sans);
  padding: 14px 22px; border-radius: var(--radius-md);
  text-decoration: none; border: 1px solid transparent;
}
.btn-primary { background: #23357A; color: #FBFBFD; }
.btn-primary:hover { background: #1B2A62; }
.btn-ghost { border-color: var(--line); color: var(--ink); background: var(--surface-raised); }
.btn-ghost:hover { border-color: var(--kram); }
.btn-rong { background: var(--rong); color: #161B33; }
.btn-rong:hover { background: #D69412; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--ink); }
/* Wordmark B: "Siam" bold + "Agents" regular, set tight with no space. */
.brand .wordmark { font: 400 21px/1 var(--font-display); letter-spacing: -0.01em; color: var(--wordmark); }
.brand .wordmark b { font-weight: 700; }
.brand .mark-lead { fill: var(--kram); }
.nav { display: flex; align-items: center; gap: 28px; }
.nav a:not(.btn) { color: var(--ink-muted); text-decoration: none; font-size: 15px; }
.nav a:not(.btn):hover { color: var(--ink); }
.nav .btn { padding: 10px 16px; font-size: 15px; }

/* Hero */
.hero { padding: 88px 0 72px; }
.hero .wrap { display: grid; grid-template-columns: 1.35fr 1fr; gap: 48px; align-items: center; }
.hero h1 { margin: 16px 0 24px; }
.hero .actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 32px; }
.hero-tracks { display: flex; align-items: center; gap: 14px; margin-top: 28px; font-weight: 600; color: var(--ink-muted); flex-wrap: wrap; }
.hero-tracks i { width: 8px; height: 8px; background: var(--rong); border-radius: var(--radius-sm); }
.blocks { width: 100%; height: auto; }
.blocks .b-kram { fill: #23357A; }
.blocks .b-tint { fill: var(--kram-tint); }
.blocks .grid rect { fill: #F3F4F7; }

/* Callout quote */
.truth { padding: 0 0 72px; }
.truth .box {
  display: grid; grid-template-columns: auto 1fr; gap: 24px; align-items: center;
  background: var(--surface-raised); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 28px 32px;
}
.truth .swatch { width: 14px; align-self: stretch; background: var(--rong); border-radius: var(--radius-sm); }
.truth p { font: 600 22px/34px var(--font-display); }
.truth small { display: block; margin-top: 6px; color: var(--ink-muted); font: 400 15px/24px var(--font-sans); }

/* Sections */
section.block { padding: 80px 0; border-top: 1px solid var(--line); }
.section-head { margin-bottom: 40px; max-width: 720px; }
.section-head h2 { margin: 10px 0 14px; }
.section-head p { color: var(--ink-muted); }

/* Tracks */
.tracks { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.track {
  background: var(--surface-raised); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 24px;
  display: flex; flex-direction: column; gap: 12px;
}
.track .tag {
  align-self: flex-start; font-size: 12px; line-height: 16px; font-weight: 600;
  padding: 4px 8px; border-radius: var(--radius-sm);
}
.tag-open { background: var(--tangchae); color: #FBFBFD; }
.tag-soon { background: var(--kram-tint); color: var(--ink); }
.track p { color: var(--ink-muted); font-size: 15px; line-height: 26px; }
.track .who { margin-top: auto; padding-top: 12px; border-top: 1px solid var(--line); font-size: 14px; color: var(--ink); }
.track .who b { font-weight: 600; }

/* Skeleton steps */
.steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; }
.step { padding: 20px 20px 0 0; border-top: 3px solid var(--kram); }
.step:nth-child(3) { border-top-color: var(--rong); }
.step .n { font: 600 14px/1 var(--font-mono); color: var(--ink-muted); }
.step h3 { font-size: 18px; line-height: 28px; margin: 10px 0 6px; }
.step p { font-size: 15px; line-height: 25px; color: var(--ink-muted); }

/* Courses */
.courses { display: grid; gap: 12px; }
.course {
  display: grid; grid-template-columns: 1fr 180px 160px; gap: 24px; align-items: center;
  background: var(--surface-raised); border: 1px solid var(--line);
  border-radius: var(--radius-md); padding: 20px 24px;
}
.course h3 { font-size: 19px; line-height: 28px; }
.course p { color: var(--ink-muted); font-size: 15px; }
.course .fmt { font-size: 14px; color: var(--ink); }
.course .fmt span { display: block; color: var(--ink-muted); }
.course .free { color: var(--tangchae); font-weight: 600; }
.tools { margin-top: 20px; font-size: 14px; color: var(--ink-muted); }
.tools code { font-family: var(--font-mono); font-size: 13px; background: var(--kram-tint); color: var(--ink); padding: 2px 6px; border-radius: var(--radius-sm); }

/* Outlines */
.outlines { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.outline { background: var(--surface-raised); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 28px; }
.outline ol { margin: 16px 0 0; padding-left: 22px; }
.outline li { padding: 4px 0; }
.outline li::marker { font-family: var(--font-mono); color: var(--ink-muted); }
.outline .warn { color: var(--chad); font-weight: 600; }
.note { margin-top: 20px; font-size: 14px; color: var(--ink-muted); }

/* Model */
.model { display: grid; grid-template-columns: 1fr auto 1fr; gap: 24px; align-items: stretch; }
.model .side { border-radius: var(--radius-lg); padding: 28px; }
.model .expert { background: #23357A; color: #EEF0F7; }
.model .expert .label { color: #A9B0C8; }
.model .maker { background: var(--surface-raised); border: 1px solid var(--line); }
.model ul { margin: 14px 0 0; padding: 0; list-style: none; }
.model li { padding: 6px 0 6px 20px; position: relative; }
.model li::before { content: ""; position: absolute; left: 0; top: 16px; width: 8px; height: 8px; border-radius: var(--radius-sm); background: var(--rong); }
.model .plus { align-self: center; font: 600 36px/1 var(--font-display); color: var(--ink-muted); }

/* Cases */
.cases { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.case { border-left: 3px solid var(--tangchae); padding: 4px 0 4px 20px; }
.case h3 { font-size: 19px; line-height: 28px; margin: 8px 0; }
.case p { color: var(--ink-muted); font-size: 15px; line-height: 26px; }

/* FAQ */
.faq { display: grid; gap: 10px; max-width: 820px; }
.faq details { background: var(--surface-raised); border: 1px solid var(--line); border-radius: var(--radius-md); padding: 18px 22px; }
.faq summary { cursor: pointer; font: 600 17px/26px var(--font-display); list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--ink-muted); font-family: var(--font-mono); }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin-top: 12px; color: var(--ink-muted); }

/* Contact band */
.contact { background: #23357A; color: #EEF0F7; padding: 80px 0; }
.contact .wrap { display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; align-items: center; }
.contact h2 { color: #FBFBFD; margin: 10px 0 14px; }
.contact .label { color: #A9B0C8; }
.contact p { color: #C9CEE0; }
.contact .actions { display: flex; flex-direction: column; gap: 12px; align-items: flex-start; }
.contact .btn-ghost { background: transparent; border-color: #4A5A9A; color: #EEF0F7; }
.contact .btn-ghost:hover { border-color: #EEF0F7; }

footer { padding: 32px 0; font-size: 14px; color: var(--ink-muted); }
footer .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* Responsive */
@media (max-width: 960px) {
  h1 { font-size: 38px; }
  h2 { font-size: 27px; line-height: 36px; }
  .hero { padding: 56px 0 48px; }
  .hero .wrap, .contact .wrap { grid-template-columns: 1fr; }
  .hero .art { max-width: 380px; }
  .tracks { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr; gap: 20px; }
  .step { padding: 16px 0 0; }
  .course { grid-template-columns: 1fr; gap: 8px; }
  .outlines, .cases { grid-template-columns: 1fr; }
  .model { grid-template-columns: 1fr; }
  .model .plus { justify-self: center; }
  .nav a:not(.btn) { display: none; }
  section.block { padding: 56px 0; }
}
@media (max-width: 560px) {
  .tracks { grid-template-columns: 1fr; }
  .truth .box { padding: 22px; }
  .truth p { font-size: 19px; line-height: 30px; }
}