/* Form kiểu một câu một màn (tham khảo bố cục kingkong.co/30-minute-strategy-session), màu brand trietphan.ai / MONA.
   Đổi brand: chỉ sửa khối :root */
:root {
  --bg: #F7F6F3;
  --surface: #FFFFFF;
  --ink: #111111;
  --muted: #5F5B55;
  --dim: #8C877F;
  --line: #E4E0D9;
  --field-line: #CBC6BE;
  --ring: #ECE9E4;
  --brand: #E85002;
  --brand-hover: #C94402;
  --brand-tint: #FFF3EA;
  --danger: #C8321F;
  --off: #D8D4CD;
  --off-ink: #7A756E;
  --r: 10px;
  --w: 560px;
  --f-display: 'Montserrat', system-ui, sans-serif;
  --f-body: 'Be Vietnam Pro', system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; min-height: 100vh; background: var(--bg); color: var(--ink); font: 400 17px/1.55 var(--f-body); -webkit-font-smoothing: antialiased; }
button, input, textarea { font: inherit; color: inherit; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--brand); outline-offset: 3px; }

/* ---------- Thanh trên ---------- */
.top {
  position: sticky; top: 0; z-index: 5; height: 56px; background: var(--surface); border-bottom: 1px solid var(--line);
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; padding: 0 16px;
}
.back { grid-column: 1; justify-self: start; display: inline-flex; align-items: center; gap: 6px; background: none; border: 0; padding: 8px 4px; font-size: 14px; font-weight: 500; color: var(--muted); cursor: pointer; }
.back:hover { color: var(--ink); }
.back svg { width: 16px; height: 16px; }
.mark { grid-column: 2; font: 900 15px/1 var(--f-display); letter-spacing: .08em; text-transform: uppercase; color: var(--brand); white-space: nowrap; }
.mark span { color: var(--ink); }
.count { grid-column: 3; justify-self: end; font-size: 13px; color: var(--dim); font-variant-numeric: tabular-nums; white-space: nowrap; }

/* ---------- Chấm tiến độ ---------- */
.dots { display: flex; justify-content: center; align-items: center; margin: 22px auto 0; padding: 0 16px; }
.dot { width: 13px; height: 13px; border-radius: 50%; background: var(--off); flex: none; transition: background .2s, box-shadow .2s; }
.dot.done { background: var(--brand); }
.dot.on { background: var(--brand); box-shadow: 0 0 0 4px rgba(232, 80, 2, .18); }
.seg { width: clamp(24px, 6vw, 48px); height: 2px; background: var(--off); }
.seg.done { background: var(--brand); }

/* ---------- Khung màn ---------- */
.stage { width: 100%; max-width: calc(var(--w) + 32px); margin: 0 auto; padding: 28px 16px 72px; }
.stage.wide { max-width: 752px; }
.screen { animation: rise .28s ease both; }
@keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .screen { animation: none; } }

.sec { text-align: center; font: 700 12px/1.3 var(--f-display); letter-spacing: .14em; text-transform: uppercase; color: var(--brand); margin: 0 0 14px; }
.lead { text-align: center; color: var(--muted); font-size: 15px; margin: -4px auto 18px; max-width: 480px; }
.qtitle { text-align: center; font: 700 clamp(22px, 3.2vw, 27px)/1.32 var(--f-body); letter-spacing: -.01em; margin: 0 0 10px; text-wrap: balance; }
.qtitle .opt-tag { display: inline-block; vertical-align: middle; font: 500 12px/1 var(--f-body); color: var(--dim); border: 1px solid var(--line); border-radius: 999px; padding: 4px 8px; margin-left: 6px; letter-spacing: 0; }
.qhint { text-align: center; color: var(--muted); font-size: 15px; margin: 0 0 4px; }
.group { text-align: center; margin: 0 0 6px; }
.group span { display: inline-block; font-size: 12px; font-weight: 600; color: var(--muted); background: var(--surface); border: 1px solid var(--line); border-radius: 999px; padding: 3px 10px; }
.body { margin-top: 22px; display: grid; gap: 12px; }

/* ---------- Ô nhập ---------- */
.field {
  width: 100%; background: var(--surface); border: 1px solid var(--field-line); border-radius: var(--r);
  box-shadow: 0 0 0 3px var(--ring); padding: 15px 18px; font-size: 19px; line-height: 1.4; transition: border-color .15s, box-shadow .15s;
}
.field::placeholder { color: #A9A49C; }
.field:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(232, 80, 2, .16); }
textarea.field { min-height: 150px; resize: vertical; font-size: 17px; }
.unit-wrap { position: relative; }
.unit-wrap .field { padding-right: 110px; }
.unit { position: absolute; right: 18px; top: 50%; transform: translateY(-50%); color: var(--dim); font-size: 15px; pointer-events: none; }
.meta-row { display: flex; justify-content: space-between; color: var(--dim); font-size: 13px; margin-top: -4px; }
.kbd { color: var(--dim); font-size: 13px; text-align: center; }

/* ---------- Thẻ lựa chọn ---------- */
.card {
  display: flex; align-items: center; gap: 14px; width: 100%; text-align: left; cursor: pointer; user-select: none;
  background: var(--surface); border: 2px solid var(--surface); border-radius: var(--r);
  box-shadow: 0 1px 3px rgba(0, 0, 0, .08); padding: 14px 18px 14px 14px; font-size: 17px; font-weight: 500; line-height: 1.35;
  transition: border-color .15s, background .15s, transform .1s;
}
.card:hover { border-color: var(--line); }
.card:active { transform: scale(.995); }
.card input { position: absolute; opacity: 0; pointer-events: none; }
.key {
  flex: none; width: 28px; height: 28px; border-radius: 6px; border: 1px solid var(--field-line); display: grid; place-items: center;
  font: 700 13px/1 var(--f-display); color: var(--muted); background: var(--surface); transition: all .15s;
}
.card.on { border-color: var(--brand); background: var(--brand-tint); }
.card.on .key { background: var(--brand); border-color: var(--brand); color: #fff; }
.card:has(input:focus-visible) { outline: 2px solid var(--brand); outline-offset: 2px; }
.multi-note { text-align: center; color: var(--dim); font-size: 14px; margin: -8px 0 0; }
.other { display: grid; gap: 6px; margin-top: 4px; }
.other label { font-size: 14px; font-weight: 600; color: var(--muted); }

/* Thang 1 đến 10 */
.scale { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.scale .card { justify-content: center; padding: 16px 0; font: 800 19px/1 var(--f-display); }
.scale .card .key { display: none; }
.scale .card.on { background: var(--brand); color: #fff; }
.ends { display: flex; justify-content: space-between; gap: 16px; color: var(--muted); font-size: 13px; }

/* Lưới câu 29 đến 33 */
.grid { display: grid; gap: 10px; }
.grow { background: var(--surface); border-radius: var(--r); box-shadow: 0 1px 3px rgba(0, 0, 0, .08); padding: 16px; display: grid; gap: 12px; border: 2px solid var(--surface); }
.grow.err { border-color: var(--danger); }
.grow-q { display: flex; gap: 10px; font-weight: 600; line-height: 1.4; }
.grow-q b { font: 800 12px/1.9 var(--f-display); color: var(--brand); flex: none; }
.pills { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.pill { position: relative; text-align: center; border: 1px solid var(--field-line); border-radius: 8px; padding: 10px 6px; font-size: 15px; font-weight: 600; cursor: pointer; background: var(--surface); transition: all .15s; }
.pill:hover { border-color: var(--muted); }
.pill input { position: absolute; opacity: 0; pointer-events: none; }
.pill.on { background: var(--brand); border-color: var(--brand); color: #fff; }
.pill:has(input:focus-visible) { outline: 2px solid var(--brand); outline-offset: 2px; }
.grow .err-msg { margin: 0; text-align: left; }

/* ---------- Nút và lỗi ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px; width: 100%; min-height: 60px;
  border: 0; border-radius: var(--r); background: var(--brand); color: #fff; font: 600 19px/1 var(--f-body); cursor: pointer;
  box-shadow: 1px 8px 30px rgba(0, 0, 0, .04), 1px 4px 10px rgba(0, 0, 0, .06); transition: background .15s, transform .1s; text-decoration: none;
}
.btn:hover { background: var(--brand-hover); }
.btn:active { transform: translateY(1px); }
.btn.off { background: var(--off); color: var(--off-ink); box-shadow: none; }
.btn:disabled { cursor: wait; opacity: .7; }
.btn svg { width: 22px; height: 22px; }
.btn-line { background: transparent; color: var(--ink); border: 1px solid var(--field-line); box-shadow: none; min-height: 40px; width: auto; padding: 0 14px; font-size: 14px; }
.btn-line:hover { background: var(--surface); border-color: var(--muted); }
.actions { margin-top: 22px; display: grid; gap: 10px; }
.err-msg { color: var(--danger); font-size: 15px; font-weight: 500; text-align: center; margin: 2px 0 0; }
.has-err .field { border-color: var(--danger); box-shadow: 0 0 0 3px rgba(200, 50, 31, .12); }

/* ---------- Màn mở đầu ---------- */
.hero { text-align: center; padding-top: 20px; }
.hero .sec { margin: 0 0 18px; font-size: 12px; color: var(--brand); }
.hero h1 {
  font: 900 clamp(40px, 8.4vw, 78px)/.95 var(--f-display); letter-spacing: -.035em; text-transform: uppercase; margin: 0 auto;
  max-width: 760px; text-wrap: balance;
}
.hero h1 em { font-style: normal; color: var(--brand); }
.hero p { color: var(--muted); font-size: 18px; max-width: 580px; margin: 22px auto 0; }
.hero .btn { max-width: 300px; margin-top: 30px; }
.facts { display: flex; justify-content: center; flex-wrap: wrap; gap: 6px 22px; margin-top: 22px; color: var(--muted); font-size: 14px; }
.facts span { display: inline-flex; align-items: center; gap: 8px; }
.facts svg { width: 16px; height: 16px; color: var(--brand); }
.privacy, .hero .privacy { text-wrap: balance; text-align: center; color: var(--dim); font-size: 13px; margin: 28px auto 0; max-width: 440px; }

/* ---------- Xem lại ---------- */
.review { display: grid; gap: 10px; margin-top: 24px; }
.rv { background: var(--surface); border-radius: var(--r); box-shadow: 0 1px 3px rgba(0, 0, 0, .08); padding: 14px 16px 14px 18px; display: grid; grid-template-columns: 1fr auto; gap: 2px 14px; align-items: center; }
.rv dt { font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--dim); }
.rv dd { margin: 0; grid-column: 1; font-weight: 500; white-space: pre-wrap; }
.rv dd.none { color: var(--danger); }
.rv .btn-line { grid-column: 2; grid-row: 1 / span 2; }

/* ---------- Cảm ơn ---------- */
.thanks { text-align: center; padding-top: 30px; }
.thanks .tick { width: 64px; height: 64px; border-radius: 50%; background: var(--brand); color: #fff; display: grid; place-items: center; margin: 0 auto 22px; }
.thanks .tick svg { width: 30px; height: 30px; }
.thanks h1 { font: 900 clamp(40px, 8vw, 72px)/1 var(--f-display); letter-spacing: -.03em; text-transform: uppercase; margin: 0; }
.thanks p { color: var(--muted); font-size: 18px; max-width: 520px; margin: 18px auto 0; }
.thanks .note { color: var(--brand); font-size: 15px; }
.thanks .btn { max-width: 340px; margin-top: 26px; }

.saved { position: fixed; left: 50%; bottom: 14px; transform: translateX(-50%); font-size: 12px; color: var(--dim); background: var(--surface); border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; pointer-events: none; }

@media (min-width: 720px) {
  .top { padding: 0 28px; }
  .stage { padding-top: 40px; }
  .scale { grid-template-columns: repeat(10, 1fr); }
  .scale .card { padding: 18px 0; }
  .grow { grid-template-columns: 1fr 300px; align-items: center; }
  .grow .err-msg { grid-column: 1 / -1; }
}