:root{
  color-scheme: light;
  --bg:#f4f7f2; --bg2:#e7f0e6; --surface:#ffffff; --surface2:#f2f6f0; --border:#dbe5d8; --border-strong:#b9cdb4;
  --text:#11201a; --text2:#435a50; --muted:#6c8077;
  --brand:#0f7a5c; --brand-strong:#0a5c45; --brand-soft:#dcf1e8; --brand-ink:#ffffff;
  --sun:#f6b73c; --warm:#e8743b; --warm-soft:#fde7da; --water:#3a9ad9; --danger:#c7372f; --danger-soft:#fbe3e1;
  --shadow:0 1px 2px rgba(17,32,26,.06),0 10px 30px rgba(17,32,26,.08);
  --radius:18px;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    color-scheme: dark;
    --bg:#0d1512; --bg2:#12201a; --surface:#16211c; --surface2:#1c2a24; --border:#26372f; --border-strong:#36503f;
    --text:#ecf4ef; --text2:#b5c8bd; --muted:#87998f;
    --brand:#2fbf8f; --brand-strong:#5fd7ad; --brand-soft:#143a2d; --brand-ink:#06261b;
    --sun:#f2b440; --warm:#ef8752; --warm-soft:#3a2216; --water:#58aee6; --danger:#ef6b62; --danger-soft:#3a1714;
    --shadow:0 1px 2px rgba(0,0,0,.35),0 10px 30px rgba(0,0,0,.3);
  }
}
:root[data-theme="dark"]{
  color-scheme: dark;
  --bg:#0d1512; --bg2:#12201a; --surface:#16211c; --surface2:#1c2a24; --border:#26372f; --border-strong:#36503f;
  --text:#ecf4ef; --text2:#b5c8bd; --muted:#87998f;
  --brand:#2fbf8f; --brand-strong:#5fd7ad; --brand-soft:#143a2d; --brand-ink:#06261b;
  --sun:#f2b440; --warm:#ef8752; --warm-soft:#3a2216; --water:#58aee6; --danger:#ef6b62; --danger-soft:#3a1714;
  --shadow:0 1px 2px rgba(0,0,0,.35),0 10px 30px rgba(0,0,0,.3);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 "Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;-webkit-font-smoothing:antialiased;min-height:100vh}
h1,h2,h3{line-height:1.2;margin:0}
button,input,select,textarea{font:inherit;color:inherit}
.hidden{display:none !important}
.wrap{max-width:720px;margin:0 auto;padding:0 16px}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;background:linear-gradient(180deg,var(--bg2),var(--bg));padding:28px 0 8px}
.brandbar{display:flex;align-items:center;gap:10px;font-weight:700;font-size:.95rem;color:var(--text2)}
.brandbar .dot{width:30px;height:30px;border-radius:9px;background:var(--brand);display:grid;place-items:center;color:var(--brand-ink);font-size:1rem}
.hero-art{display:block;width:100%;height:auto;margin:18px 0 0;border-radius:22px;box-shadow:var(--shadow)}
.intro{background:var(--surface);border:1px solid var(--border);border-radius:24px;box-shadow:var(--shadow);padding:26px 22px;margin:-26px 10px 0;position:relative}
.eyebrow{display:inline-flex;align-items:center;gap:6px;background:var(--brand-soft);color:var(--brand-strong);font-weight:600;font-size:.78rem;letter-spacing:.04em;text-transform:uppercase;padding:6px 11px;border-radius:999px}
.intro h1{font-size:clamp(1.65rem,6vw,2.3rem);font-weight:800;margin:14px 0 10px;letter-spacing:-.02em}
.intro h1 em{font-style:normal;color:var(--brand)}
.intro p{color:var(--text2);margin:0 0 16px}
.perks{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:18px 0 22px}
.perk{background:var(--surface2);border:1px solid var(--border);border-radius:14px;padding:12px;text-align:center}
.perk b{display:block;font-size:1.35rem}
.perk span{display:block;font-size:.8rem;color:var(--text2);line-height:1.35;margin-top:2px}
@media (max-width:420px){.perks{grid-template-columns:1fr}.perk{display:flex;gap:10px;align-items:center;text-align:left}.perk b{font-size:1.2rem}}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:14px;padding:14px 22px;font-weight:700;font-size:1rem;cursor:pointer;transition:transform .08s ease,background .15s ease,box-shadow .15s ease;text-decoration:none}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--brand);color:var(--brand-ink);box-shadow:0 6px 18px color-mix(in srgb,var(--brand) 35%,transparent)}
.btn-primary:hover{background:var(--brand-strong)}
.btn-ghost{background:transparent;color:var(--text2);border:1px solid var(--border-strong)}
.btn-ghost:hover{background:var(--surface2)}
.btn-block{width:100%}
.btn:disabled{opacity:.55;cursor:not-allowed}
.trust{display:flex;gap:8px;align-items:flex-start;font-size:.82rem;color:var(--muted);margin-top:14px}

/* ---------- survey ---------- */
.topbar{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.topbar .wrap{padding-top:12px;padding-bottom:12px}
.stepline{display:flex;justify-content:space-between;align-items:center;font-size:.85rem;color:var(--text2);margin-bottom:8px}
.stepline b{color:var(--text)}
.progress{height:8px;border-radius:999px;background:var(--border);overflow:hidden}
.progress i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--brand),var(--sun));border-radius:999px;transition:width .35s ease}
.dots{display:flex;gap:6px;margin-top:10px}
.dots span{flex:1;text-align:center;font-size:1.05rem;filter:grayscale(1);opacity:.45;transition:all .2s}
.dots span.on{filter:none;opacity:1}
.stephead{padding:26px 0 6px}
.stephead .icon{font-size:2.2rem}
.stephead h2{font-size:1.55rem;font-weight:800;margin:6px 0 4px;letter-spacing:-.01em}
.stephead p{color:var(--text2);margin:0}
.q{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px 18px;margin:16px 0;box-shadow:var(--shadow);transition:border-color .2s}
.q.err{border-color:var(--danger);background:linear-gradient(0deg,var(--danger-soft),var(--danger-soft)) padding-box}
fieldset.q{min-width:0}
.q legend,.q .qlabel{font-weight:700;font-size:1.04rem;padding:0;margin-bottom:4px;display:block;float:left;width:100%}
.q legend + *{clear:both}
.qhint{font-size:.84rem;color:var(--muted);margin:2px 0 10px;clear:both}
.req{color:var(--warm);margin-left:3px}
.errmsg{color:var(--danger);font-size:.85rem;font-weight:600;margin-top:8px}
.opts{display:grid;gap:10px;margin-top:12px;clear:both}
.opts.two{grid-template-columns:repeat(2,minmax(0,1fr))}
@media (max-width:480px){.opts.two{grid-template-columns:1fr}}
.opt{position:relative;display:flex;align-items:center;gap:12px;border:1.5px solid var(--border);border-radius:14px;padding:13px 14px;cursor:pointer;background:var(--surface);transition:border-color .15s,background .15s,transform .08s;min-height:52px}
.opt:hover{border-color:var(--border-strong)}
.opt:active{transform:scale(.99)}
.opt input{position:absolute;opacity:0;pointer-events:none}
.opt .mark{flex:none;width:22px;height:22px;border-radius:50%;border:2px solid var(--border-strong);display:grid;place-items:center;transition:all .15s}
.opt.multi .mark{border-radius:7px}
.opt .mark::after{content:"";width:10px;height:10px;border-radius:inherit;background:var(--brand-ink);transform:scale(0);transition:transform .15s}
.opt.multi .mark::after{content:"✓";width:auto;height:auto;background:none;color:var(--brand-ink);font-size:.8rem;font-weight:800;line-height:1}
.opt input:checked ~ .mark{background:var(--brand);border-color:var(--brand)}
.opt input:checked ~ .mark::after{transform:scale(1)}
.opt:has(input:checked){border-color:var(--brand);background:var(--brand-soft)}
.opt input:focus-visible ~ .mark{outline:3px solid color-mix(in srgb,var(--brand) 45%,transparent);outline-offset:2px}
.opt .t{line-height:1.35}
.opt.disabled{opacity:.45;cursor:not-allowed}
.scale{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin-top:14px;clear:both}
.scale label{position:relative;cursor:pointer}
.scale input{position:absolute;opacity:0}
.scale span{display:grid;place-items:center;height:52px;border-radius:14px;border:1.5px solid var(--border);font-weight:800;font-size:1.15rem;background:var(--surface);transition:all .15s}
.scale input:checked + span{background:var(--brand);border-color:var(--brand);color:var(--brand-ink);transform:translateY(-2px)}
.scale input:focus-visible + span{outline:3px solid color-mix(in srgb,var(--brand) 45%,transparent)}
.scale-labels{display:flex;justify-content:space-between;font-size:.8rem;color:var(--muted);margin-top:8px}
select.sel,input.inp,textarea.inp{width:100%;margin-top:12px;border:1.5px solid var(--border);border-radius:14px;padding:13px 14px;background:var(--surface);font-size:1rem;clear:both;display:block}
select.sel:focus,input.inp:focus,textarea.inp:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 4px color-mix(in srgb,var(--brand) 18%,transparent)}
textarea.inp{min-height:110px;resize:vertical}
.counter{font-size:.75rem;color:var(--muted);text-align:right;margin-top:4px}
.navbar{position:sticky;bottom:0;z-index:10;background:color-mix(in srgb,var(--bg) 90%,transparent);backdrop-filter:blur(10px);border-top:1px solid var(--border);padding:12px 0 calc(12px + env(safe-area-inset-bottom))}
.navbar .wrap{display:flex;gap:10px}
.navbar .btn-primary{flex:1}
.check{display:flex;gap:12px;align-items:flex-start;cursor:pointer;margin-top:12px;font-size:.95rem;color:var(--text2)}
.check input{width:20px;height:20px;margin-top:3px;accent-color:var(--brand);flex:none}
.privacy{font-size:.82rem;color:var(--muted);background:var(--surface2);border-radius:12px;padding:12px 14px;margin-top:12px}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.alert{background:var(--danger-soft);color:var(--danger);border-radius:12px;padding:12px 14px;font-weight:600;margin:12px 0}

/* ---------- thanks ---------- */
.thanks{text-align:center;padding:40px 0 60px}
.thanks .big{font-size:4rem;line-height:1}
.thanks h2{font-size:1.8rem;font-weight:800;margin:14px 0 8px}
.thanks p{color:var(--text2);max-width:480px;margin:0 auto 18px}
.thanks .btn{margin:6px}
.footer{text-align:center;font-size:.8rem;color:var(--muted);padding:26px 16px 40px}
.fade{animation:fade .35s ease}
@keyframes fade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){*{animation:none !important;transition:none !important}}