/* KMUTT pre-registration — shared tokens + public form styles */
:root {
  --bg: #faf7f2;
  --surface: #ffffff;
  --ink: #1d1a17;
  --muted: #6b645c;
  --line: #e4ddd2;
  --accent: #d9480f;          /* KMUTT-style orange */
  --accent-ink: #ffffff;
  --accent-soft: #fff0e6;
  --ok: #2b8a3e;
  --warn: #e67700;
  --danger: #c92a2a;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(40, 30, 20, .06), 0 6px 24px rgba(40, 30, 20, .05);
  --font: 'Inter', 'Noto Sans Thai', system-ui, -apple-system, 'Segoe UI', sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --bg: #17140f; --surface: #201c17; --ink: #f3ede4; --muted: #a79f93; --line: #38322a;
    --accent: #ff7a3d; --accent-ink: #1a0f08; --accent-soft: #3a2415;
    --ok: #69db7c; --warn: #ffa94d; --danger: #ff8787;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4);
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.55 var(--font); }
a { color: var(--accent); }
.wrap { width: 100%; max-width: 760px; margin: 0 auto; padding: 0 16px; }
[hidden] { display: none !important; }

/* top bar */
.topbar { border-bottom: 1px solid var(--line); background: var(--surface); position: sticky; top: 0; z-index: 5; }
.topbar-in { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-top: 10px; padding-bottom: 10px; }
.brand { display: flex; align-items: baseline; gap: 10px; min-width: 0; }
.brand-mark { font-weight: 700; letter-spacing: .08em; color: var(--accent); font-size: 18px; }
.brand-sub { color: var(--muted); font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.lang { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; flex: none; }
.lang button { border: 0; background: transparent; color: var(--muted); padding: 6px 14px; font: 600 13px var(--font); cursor: pointer; }
.lang button[aria-pressed='true'] { background: var(--accent); color: var(--accent-ink); }

/* hero */
.hero { padding: 36px 0 18px; }
.eyebrow { margin: 0 0 8px; color: var(--accent); font-weight: 600; font-size: 13px; letter-spacing: .06em; text-transform: uppercase; }
.hero h1 { margin: 0 0 10px; font-size: clamp(26px, 5.2vw, 38px); line-height: 1.2; letter-spacing: -.01em; }
.lead { margin: 0; color: var(--muted); max-width: 60ch; }

/* cards + fields */
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; margin: 0 0 16px; box-shadow: var(--shadow); min-width: 0; }
fieldset.card legend { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; padding: 0 6px; margin-left: -6px; }
.step { display: inline-grid; place-items: center; width: 26px; height: 26px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); font-size: 13px; font-weight: 700; }
.field { margin: 14px 0 0; }
.field label, .q { display: block; font-weight: 600; font-size: 14px; margin-bottom: 6px; }
.req { color: var(--danger); font-style: normal; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
input[type=text], input[type=email], input[type=tel], input[type=search], input[type=password], input[type=date], input[type=number], select, textarea {
  width: 100%; padding: 11px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); color: var(--ink);
  font: inherit; min-height: 44px;
}
textarea { resize: vertical; }
input:focus-visible, select:focus-visible, textarea:focus-visible, button:focus-visible, .choice:has(input:focus-visible), .pill:has(input:focus-visible) {
  outline: 3px solid color-mix(in srgb, var(--accent) 45%, transparent); outline-offset: 1px;
}
.field.invalid input, .field.invalid select, .consent.invalid { border-color: var(--danger); }
.err { color: var(--danger); font-size: 13px; margin: 6px 0 0; min-height: 0; }
.err:empty { display: none; }
.hint { color: var(--muted); font-size: 13px; margin: 10px 0 0; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }

/* choice cards */
.choice-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.choice-col { display: grid; gap: 10px; margin-bottom: 8px; }
.choice { display: flex; gap: 12px; align-items: center; border: 1.5px solid var(--line); border-radius: 12px; padding: 14px; cursor: pointer; background: var(--bg); }
.choice input { accent-color: var(--accent); width: 18px; height: 18px; flex: none; margin: 0; }
.choice span { display: flex; flex-direction: column; }
.choice small { color: var(--muted); font-size: 13px; }
.choice:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }

/* rating pills */
.rate { margin-top: 16px; }
.scale { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.pill { cursor: pointer; }
.pill input { position: absolute; opacity: 0; pointer-events: none; }
.pill span { display: grid; place-items: center; min-height: 44px; border: 1.5px solid var(--line); border-radius: 10px; font-weight: 600; background: var(--bg); }
.pill:hover span { border-color: var(--accent); }
.pill input:checked + span { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.scale-legend { display: flex; justify-content: space-between; color: var(--muted); font-size: 12px; margin-top: 8px; }
.lead-q { margin-top: 24px; }

.consent .check { display: flex; gap: 12px; align-items: flex-start; font-size: 14px; cursor: pointer; }
.consent input { accent-color: var(--accent); width: 20px; height: 20px; flex: none; margin-top: 2px; }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 1px solid var(--line); background: var(--surface); color: var(--ink);
  border-radius: 10px; padding: 9px 16px; min-height: 40px; font: 600 14px var(--font); cursor: pointer; text-decoration: none; }
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { filter: brightness(1.06); }
.btn.danger { color: var(--danger); }
.btn.small { padding: 5px 10px; min-height: 32px; font-size: 13px; }
.btn.big { width: 100%; min-height: 52px; font-size: 17px; border-radius: 12px; }
.btn:disabled { opacity: .55; cursor: progress; }
.form-err { text-align: center; margin: 0 0 12px; }

/* done */
.done { text-align: center; padding: 40px 20px; margin-top: 24px; }
.tick { width: 64px; height: 64px; margin: 0 auto 12px; border-radius: 50%; display: grid; place-items: center; background: var(--ok); color: #fff; font-size: 32px; }
.done h2 { margin: 0 0 6px; }
.ref { color: var(--muted); }
.ref b { color: var(--ink); font-variant-numeric: tabular-nums; }
.foot { color: var(--muted); font-size: 13px; padding-top: 12px; padding-bottom: 40px; text-align: center; }

@media (max-width: 560px) {
  .grid2, .choice-row { grid-template-columns: 1fr; }
  .brand-sub { display: none; }
  .card { padding: 16px; }
}
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }