/* main.css — mobile-first. Tông xanh rêu / xanh đậm. Không phụ thuộc thư viện ngoài. */

:root {
  --moss-900: #12241c;
  --moss-800: #163024;
  --moss-700: #1d4032;
  --moss-600: #285442;
  --moss-500: #35705a;
  --moss-400: #4c8f74;
  --moss-300: #7fb59c;
  --gold:     #c8a35a;
  --gold-lt:  #e2c689;
  --paper:    #f6f4ef;
  --card:     #ffffff;
  --ink:      #1b241f;
  --ink-2:    #4d5a53;
  --ink-3:    #7d8a83;
  --line:     #e0ded6;
  --warn-bg:  #fdf6e6;
  --warn-ln:  #c8a35a;
  --err:      #b3261e;
  --radius:   14px;
  --shadow:   0 2px 8px rgba(18,36,28,.06), 0 12px 28px rgba(18,36,28,.07);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  font-size: 16px;
  padding-bottom: 40px;
}

.wrap { max-width: 640px; margin: 0 auto; padding: 20px 16px 0; }

/* ── HERO ─────────────────────────────────────── */
.hero {
  background: linear-gradient(160deg, var(--moss-800) 0%, var(--moss-600) 100%);
  color: #fff;
  border-radius: var(--radius);
  padding: 26px 20px 24px;
  margin-bottom: 18px;
  box-shadow: var(--shadow);
}
.hero__kicker {
  font-size: 11px; font-weight: 800; letter-spacing: 2px;
  color: var(--gold-lt); margin-bottom: 10px;
}
.hero__h1 { font-size: 24px; line-height: 1.25; font-weight: 800; letter-spacing: -.3px; }
.hero__sub { margin-top: 12px; font-size: 15px; color: rgba(255,255,255,.86); }
.hero--result { padding-bottom: 22px; }

/* ── PROGRESS ─────────────────────────────────── */
.progress { margin-bottom: 16px; }
.progress__meta {
  display: flex; justify-content: space-between;
  font-size: 12.5px; font-weight: 700; color: var(--ink-3); margin-bottom: 7px;
}
.progress__track { height: 6px; background: #e4e2da; border-radius: 99px; overflow: hidden; }
.progress__fill {
  height: 100%; border-radius: 99px;
  background: linear-gradient(90deg, var(--moss-500), var(--moss-400));
  transition: width .32s cubic-bezier(.4,0,.2,1);
}

/* ── QUESTION ─────────────────────────────────── */
.qcard {
  background: var(--card); border-radius: var(--radius);
  padding: 20px 16px; box-shadow: var(--shadow);
}
.qcard__title { font-size: 19px; font-weight: 800; line-height: 1.32; color: var(--moss-800); }
.qcard__hint { margin-top: 7px; font-size: 13.5px; color: var(--ink-3); }
.qcard__opts { margin-top: 16px; display: flex; flex-direction: column; gap: 9px; }

.opt {
  display: flex; align-items: center; gap: 12px;
  width: 100%; min-height: 58px; padding: 12px 14px;
  background: #fbfaf7; border: 1.5px solid var(--line); border-radius: 11px;
  font: inherit; font-size: 15.5px; color: var(--ink); text-align: left;
  cursor: pointer; transition: border-color .15s, background .15s, transform .08s;
  -webkit-tap-highlight-color: transparent;
}
.opt:active { transform: scale(.99); }
.opt:hover { border-color: var(--moss-300); }
.opt--on { border-color: var(--moss-500); background: #eef5f1; }

.opt__box {
  flex: none; width: 21px; height: 21px; border-radius: 50%;
  border: 2px solid #c3cbc6; position: relative; transition: border-color .15s;
}
.opt__box--sq { border-radius: 6px; }
.opt--on .opt__box { border-color: var(--moss-500); }
.opt--on .opt__box::after {
  content: ''; position: absolute; inset: 3px;
  border-radius: inherit; background: var(--moss-500);
}
.opt__label { display: flex; flex-direction: column; }
.opt__text { font-weight: 600; }
.opt__desc { font-size: 13px; color: var(--ink-3); margin-top: 2px; }

.qcard__nav { display: flex; gap: 10px; margin-top: 18px; align-items: center; }

/* ── BUTTONS ──────────────────────────────────── */
.btn {
  font: inherit; font-weight: 800; border: 0; border-radius: 11px;
  padding: 14px 18px; cursor: pointer; transition: opacity .15s, transform .08s;
  -webkit-tap-highlight-color: transparent;
}
.btn:active { transform: scale(.99); }
.btn--main {
  background: linear-gradient(135deg, var(--moss-600), var(--moss-500));
  color: #fff; margin-left: auto; box-shadow: 0 4px 14px rgba(40,84,66,.28);
}
.btn--main:disabled { opacity: .42; cursor: not-allowed; box-shadow: none; }
.btn--ghost { background: transparent; color: var(--ink-2); padding-left: 4px; padding-right: 4px; }
.btn--full { width: 100%; margin: 0; display: block; text-align: center; text-decoration: none; }

/* ── BANNER ───────────────────────────────────── */
.banner {
  border-radius: 10px; padding: 12px 14px; font-size: 14px;
  margin-bottom: 14px; line-height: 1.55;
}
.banner--warn { background: var(--warn-bg); border-left: 3px solid var(--warn-ln); color: #6d5620; }
.banner code {
  background: rgba(0,0,0,.06); padding: 1px 5px; border-radius: 4px;
  font-size: 12.5px; font-family: ui-monospace, Menlo, Consolas, monospace;
}

/* ── COMBO ────────────────────────────────────── */
.combo {
  background: var(--card); border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); margin-bottom: 16px; position: relative;
}
.combo--best { border: 2px solid var(--moss-500); }
.combo__badge {
  background: var(--moss-600); color: #fff; font-size: 12px; font-weight: 800;
  letter-spacing: 1.2px; padding: 8px 14px;
}
.combo__img { width: 100%; display: block; aspect-ratio: 16/10; object-fit: contain; background: #fff; padding: 10px; border-bottom: 1px solid var(--line); }
.combo__img--empty {
  display: flex; align-items: center; justify-content: center;
  color: var(--ink-3); font-size: 13.5px; border-bottom: 1px solid var(--line);
}
.combo__body { padding: 16px; }
.combo__name { font-size: 18px; font-weight: 800; color: var(--moss-800); line-height: 1.3; }
.combo__spec { list-style: none; margin: 11px 0; font-size: 14.5px; color: var(--ink-2); }
.combo__spec li { padding: 3px 0; }
.combo__spec b { color: var(--ink); }
.combo__price {
  font-size: 19px; font-weight: 800; color: var(--moss-600);
  padding: 9px 0; border-top: 1px solid var(--line);
}
.combo__desc { font-size: 14px; color: var(--ink-2); }

/* ── REASONS ──────────────────────────────────── */
.reasons {
  background: #eef5f1; border-radius: var(--radius);
  padding: 16px; margin-bottom: 16px;
}
.reasons__title { font-size: 16px; font-weight: 800; color: var(--moss-800); margin-bottom: 9px; }
.reasons__list { list-style: none; }
.reasons__list li {
  position: relative; padding-left: 22px; margin-bottom: 7px; font-size: 14.5px; color: var(--ink-2);
}
.reasons__list li::before {
  content: '✓'; position: absolute; left: 0; top: 0;
  color: var(--moss-500); font-weight: 800;
}

/* ── ALTERNATIVES ─────────────────────────────── */
.alts { margin-bottom: 18px; }
.alts__title { font-size: 16px; font-weight: 800; color: var(--ink-2); margin: 4px 0 11px; }
.alts__grid { display: grid; gap: 12px; }

/* ── LEAD FORM ────────────────────────────────── */
.leadbox {
  background: var(--moss-800); color: #fff;
  border-radius: var(--radius); padding: 20px 16px; box-shadow: var(--shadow);
}
.leadbox__title { font-size: 20px; font-weight: 800; }
.leadbox__sub { font-size: 14.5px; color: rgba(255,255,255,.82); margin-top: 7px; margin-bottom: 16px; }

.form { display: flex; flex-direction: column; gap: 12px; }
.form__f { display: flex; flex-direction: column; gap: 5px; }
.form__lb { font-size: 13.5px; font-weight: 700; color: rgba(255,255,255,.9); }
.req { color: var(--gold-lt); font-style: normal; }
.form input, .form textarea {
  font: inherit; font-size: 16px;           /* 16px: chặn iOS tự phóng to khi chạm */
  padding: 13px 14px; border-radius: 10px; border: 1.5px solid rgba(255,255,255,.18);
  background: rgba(255,255,255,.07); color: #fff; width: 100%;
}
.form input::placeholder, .form textarea::placeholder { color: rgba(255,255,255,.42); }
.form input:focus, .form textarea:focus { outline: none; border-color: var(--gold); }
.form textarea { resize: vertical; }
.form__fe { font-size: 12.5px; color: #ffb4ae; min-height: 1px; }
.form__err {
  display: none; font-size: 14px; color: #ffb4ae;
  background: rgba(179,38,30,.16); padding: 9px 12px; border-radius: 8px;
}
.form__err.is-on { display: block; }
.form__note { font-size: 12.5px; color: rgba(255,255,255,.55); text-align: center; }
.hp { position: absolute; left: -9999px; opacity: 0; height: 0; width: 0; }

.thanks { text-align: center; padding: 8px 0; }
.thanks h3 { font-size: 22px; font-weight: 800; margin-bottom: 8px; }
.thanks p { font-size: 15px; color: rgba(255,255,255,.85); margin-bottom: 16px; }

/* ── FOOT ─────────────────────────────────────── */
.foot { margin-top: 20px; text-align: center; }
.foot__brand { font-size: 13.5px; color: var(--ink-3); margin-top: 10px; line-height: 1.9; }
.foot__brand a { color: var(--moss-600); font-weight: 700; text-decoration: none; }

/* ── TABLET / DESKTOP ─────────────────────────── */
@media (min-width: 720px) {
  .wrap { padding-top: 34px; }
  .hero { padding: 34px 30px 30px; }
  .hero__h1 { font-size: 30px; }
  .qcard { padding: 26px 24px; }
  .qcard__title { font-size: 21px; }
  .alts__grid { grid-template-columns: 1fr 1fr; }
  .leadbox { padding: 26px 24px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}