/* BDC khảo sát — shared tokens & components */
:root {
  --bg: #f3f5f9;
  --surface: #ffffff;
  --ink: #15203a;
  --muted: #5a6478;
  --line: #d9dfe9;
  --ball: #d9581a;
  --ball-soft: #fdeee5;
  --navy: #1b2c54;
  --on-navy: #f3f5f9;
  --warn: #b4321f;
  --ok: #1f7a4a;
  --ok-soft: #e4f4ea;
  --font-display: "Barlow Condensed", "Arial Narrow", sans-serif;
  --font-body: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1322; --surface: #161f33; --ink: #e8ecf4; --muted: #9aa4b8; --line: #2a3550;
    --ball: #f2793a; --ball-soft: #3a2418; --navy: #22355f; --on-navy: #eef2f8;
    --warn: #ff8b76; --ok: #5ccf8f; --ok-soft: #173326; color-scheme: dark;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; }
body {
  background: var(--bg); color: var(--ink);
  font-family: var(--font-body); font-size: 15px; line-height: 1.55;
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
.band { background: var(--navy); color: var(--on-navy); padding-top: env(safe-area-inset-top, 0px); }
.wrap {
  max-width: 620px; margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.wrap.wide { max-width: 980px; }
header .wrap { padding-block: 28px 26px; display: grid; gap: 8px; }
.eyebrow {
  font-family: var(--font-display); font-weight: 600; font-size: 14px;
  letter-spacing: .14em; text-transform: uppercase; opacity: .8;
}
h1 {
  font-family: var(--font-display); font-weight: 700; font-size: clamp(30px, 8vw, 40px);
  line-height: 1.05; margin: 0; text-wrap: balance;
}
h1 span { color: var(--ball); }
.facts { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 6px; }
.fact {
  font-size: 13px; padding: 4px 10px; border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--on-navy) 30%, transparent);
}

main .wrap { padding-block: 22px 40px; display: grid; gap: 26px; }
section { display: grid; gap: 12px; }
h2 { font-family: var(--font-display); font-weight: 700; font-size: 22px; margin: 0; letter-spacing: .01em; }
.hint { color: var(--muted); font-size: 14px; margin: 0; max-width: 62ch; }

.fields { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.field { display: grid; gap: 5px; min-width: 0; }
.field.full { grid-column: 1 / -1; }
label, .label { font-size: 13px; font-weight: 600; color: var(--muted); }
input[type=text], input[type=tel], input[type=password] {
  width: 100%; font: inherit; color: var(--ink); background: var(--surface);
  border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px;
}
input:focus-visible, button:focus-visible { outline: 2px solid var(--ball); outline-offset: 2px; }

.slots { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.slot {
  position: relative; text-align: left; font: inherit; color: var(--ink);
  background: var(--surface); border: 1.5px solid var(--line); border-radius: 14px;
  padding: 14px 14px 13px; display: grid; gap: 2px; cursor: pointer;
  transition: border-color .15s, background .15s;
}
.slot:hover { border-color: var(--ball); }
.slot[aria-pressed="true"] { border-color: var(--ball); background: var(--ball-soft); }
.slot .code { font-family: var(--font-display); font-weight: 600; font-size: 13px; letter-spacing: .12em; color: var(--muted); }
.slot .day { font-family: var(--font-display); font-weight: 700; font-size: 26px; line-height: 1.1; }
.slot .time { font-variant-numeric: tabular-nums; font-weight: 600; font-size: 15px; }
.slot .note { font-size: 12.5px; color: var(--muted); }
.rank {
  position: absolute; top: 12px; right: 12px; width: 34px; height: 34px; border-radius: 50%;
  display: grid; place-items: center; font-family: var(--font-display); font-weight: 700; font-size: 18px;
  border: 1.5px dashed var(--line); color: var(--muted);
}
.slot[aria-pressed="true"] .rank { background: var(--ball); border: 0; color: #fff; }

.picked { display: grid; gap: 6px; padding: 0; margin: 0; list-style: none; }
.picked li {
  display: flex; gap: 10px; align-items: baseline; font-size: 14px;
  padding: 8px 12px; border-radius: 10px; background: var(--surface); border: 1px solid var(--line);
}
.picked b { font-family: var(--font-display); font-size: 15px; letter-spacing: .04em; color: var(--ball); min-width: 82px; }
.picked .empty { color: var(--muted); }
.linkbtn {
  justify-self: start; font: inherit; font-size: 13px; color: var(--muted); background: none;
  border: 0; padding: 2px 0; text-decoration: underline; cursor: pointer;
}

.primary {
  font: inherit; font-weight: 600; font-size: 16px; color: #fff; background: var(--ball);
  border: 0; border-radius: 12px; padding: 14px 18px; cursor: pointer; width: 100%;
}
.primary:hover { filter: brightness(1.05); }
.primary[disabled] { opacity: .6; cursor: progress; }
.ghost {
  font: inherit; font-weight: 600; font-size: 14px; color: var(--ink); background: var(--surface);
  border: 1.5px solid var(--ink); border-radius: 10px; padding: 9px 16px; cursor: pointer;
}
.errors { color: var(--warn); font-size: 14px; margin: 0; padding-left: 18px; }
.errors:empty { display: none; }
.notice {
  border-radius: 14px; padding: 18px; display: grid; gap: 8px;
  background: var(--ok-soft); border: 1px solid color-mix(in srgb, var(--ok) 40%, transparent);
}
.notice h2 { color: var(--ok); }
.notice.err { background: var(--surface); border-color: var(--warn); }
.notice.err h2 { color: var(--warn); }
.summary { white-space: pre-wrap; margin: 0; font-size: 14px; font-variant-numeric: tabular-nums; }
footer { color: var(--muted); font-size: 13px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

@media (max-width: 420px) {
  .fields { grid-template-columns: 1fr; }
  .slot .day { font-size: 23px; }
}
@media (prefers-reduced-motion: reduce) { .slot { transition: none; } }