/* Бриф в системе презентации: три поверхности (dark / light / grad),
   центрированные шапки, eyebrow с усами, линейки, номер экрана моно.
   Отличие от слайдов — это работающая форма с шагами, а не листалка. */
:root{
  --purple-d:#8b6cff;
  --purple-l:#6a48e8;
  --ink-d:#edeae2;
  --ink-l:#141414;
  --mute-d:#8b8985;
  --mute-l:#6b675c;
  --radius:22px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  min-height:100vh;
  font-family:'Inter',-apple-system,BlinkMacSystemFont,'Helvetica Neue',sans-serif;
  font-size:16px;line-height:1.5;-webkit-font-smoothing:antialiased;
  transition:background-color .3s ease;
}
/* поверхности — один в один из презентации */
body.dark{
  background-color:#131313;color:var(--ink-d);
  background-image:linear-gradient(#1d1d1d 1px,transparent 1px),
                   linear-gradient(90deg,#1d1d1d 1px,transparent 1px);
  background-size:48px 48px;
  --accent:var(--purple-d);--ink:var(--ink-d);--mute:var(--mute-d);
  --card:#1c1c1c;--card-2:#212121;--line:#2a2a2a;--field:#151515;--tick:#12101f;
}
body.light{
  background-color:#eae6db;color:var(--ink-l);
  background-image:linear-gradient(#dedad0 1px,transparent 1px),
                   linear-gradient(90deg,#dedad0 1px,transparent 1px);
  background-size:48px 48px;
  --accent:var(--purple-l);--ink:var(--ink-l);--mute:var(--mute-l);
  --card:#e3dfd4;--card-2:#ded9cc;--line:#d5d0c3;--field:#f2efe8;--tick:#fff;
}
body.grad{
  color:var(--ink-d);
  background:linear-gradient(180deg,#2a2060 0%,#241c52 16.7%,#1f1844 33.3%,#1a1437 50%,
                             #17132a 66.7%,#15131f 83.3%,#141317 100%);
  background-attachment:fixed;
  --accent:var(--purple-d);--ink:var(--ink-d);--mute:var(--mute-d);
  --card:rgba(255,255,255,.055);--card-2:rgba(255,255,255,.08);
  --line:rgba(255,255,255,.13);--field:rgba(255,255,255,.06);--tick:#12101f;
}
a{color:var(--accent)}
.wrap{max-width:620px;margin:0 auto;padding:0 20px;position:relative}
.screen{min-height:100vh;display:flex;flex-direction:column;justify-content:center;
  padding:64px 0 90px;position:relative}

/* ---------- фирменные элементы ---------- */
.eyebrow{
  display:flex;align-items:center;justify-content:center;gap:14px;
  font-family:'JetBrains Mono',ui-monospace,monospace;font-size:11px;font-weight:500;
  letter-spacing:.26em;text-transform:uppercase;color:var(--accent);
  margin-bottom:20px;text-align:center;
}
.eyebrow::before,.eyebrow::after{content:"";height:2px;width:44px;background:var(--accent);opacity:.85;flex:none}
h1,h2{font-family:'Inter Tight','Inter',sans-serif;font-weight:900;letter-spacing:-.02em;
  text-transform:uppercase;text-align:center;line-height:1.04}
h1{font-size:clamp(32px,7.4vw,52px)}
h2{font-size:clamp(24px,5.4vw,34px)}
.acc{color:var(--accent)}
.lead{font-size:clamp(16px,3.4vw,19px);font-weight:700;line-height:1.34;text-align:center}
.small{font-size:14px;font-weight:400;line-height:1.45;text-align:center}
.muted{color:var(--mute)}
.rule{height:2px;background:var(--accent);max-width:360px;margin:0 auto;opacity:.9}
.mt16{margin-top:16px}.mt24{margin-top:24px}.mt32{margin-top:32px}.mt40{margin-top:40px}
.pnum{
  position:absolute;right:20px;bottom:34px;
  font-family:'JetBrains Mono',ui-monospace,monospace;font-size:12px;letter-spacing:.22em;
  color:var(--mute);opacity:.85;
}
.alist{display:flex;flex-direction:column;gap:16px;max-width:520px;margin-left:auto;margin-right:auto}
.arow{display:flex;gap:14px;align-items:flex-start}
.arow .ar{color:var(--accent);font-weight:700;flex:none}
.arow .at{font-size:16px;font-weight:700;line-height:1.34}

/* ---------- прогресс ---------- */
.progress-wrap{position:fixed;top:0;left:0;right:0;z-index:20;
  background:inherit;border-bottom:1px solid var(--line)}
body.light .progress-wrap{background:rgba(234,230,219,.94);backdrop-filter:blur(8px)}
body.dark .progress-wrap{background:rgba(19,19,19,.94);backdrop-filter:blur(8px)}
.progress-inner{max-width:620px;margin:0 auto;padding:14px 20px 12px}
.progress-meta{display:flex;justify-content:space-between;align-items:baseline;gap:12px;
  font-family:'JetBrains Mono',ui-monospace,monospace;font-size:11px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--mute);margin-bottom:9px}
.progress-meta b{color:var(--accent);font-weight:500}
.progress-track{height:3px;background:var(--line);border-radius:99px;overflow:hidden}
.progress-fill{height:100%;width:0;background:var(--accent);border-radius:99px;
  transition:width .35s cubic-bezier(.4,0,.2,1)}

/* ---------- шаг ---------- */
.step{padding-top:120px}
.step-head{margin-bottom:28px}
.step-head .sub{font-size:15px;color:var(--mute);text-align:center;margin-top:10px}
.q{margin-bottom:26px}
.q-label{display:block;font-size:16px;font-weight:700;margin-bottom:4px;line-height:1.35}
.q-label .star{color:var(--accent)}
.q-hint{font-family:'JetBrains Mono',ui-monospace,monospace;font-size:10px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--mute);margin-bottom:10px}
.q-body{margin-top:11px}
input[type=text],textarea{
  width:100%;font:inherit;font-weight:500;color:var(--ink);background:var(--field);
  border:1px solid var(--line);border-radius:12px;padding:14px 15px;
  transition:border-color .15s,box-shadow .15s;
}
input[type=text]::placeholder,textarea::placeholder{color:var(--mute);opacity:.75}
input[type=text]:focus,textarea:focus{outline:none;border-color:var(--accent);
  box-shadow:0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent)}
textarea{min-height:96px;resize:vertical}
.opts{display:flex;flex-direction:column;gap:9px}
.opt{display:flex;align-items:flex-start;gap:12px;cursor:pointer;
  background:var(--card);border:1px solid var(--line);border-radius:12px;padding:13px 15px;
  font-size:15px;font-weight:600;transition:border-color .15s,background .15s}
.opt:hover{border-color:var(--accent);opacity:.95}
.opt input{position:absolute;opacity:0;pointer-events:none}
.mark{width:19px;height:19px;border:2px solid var(--mute);flex:none;margin-top:1px;
  display:flex;align-items:center;justify-content:center;transition:border-color .15s,background .15s}
.mark.radio{border-radius:50%}
.mark.check{border-radius:5px}
.mark::after{content:"";opacity:0;transition:opacity .12s}
.mark.radio::after{width:7px;height:7px;border-radius:50%;background:var(--tick)}
.mark.check::after{width:5px;height:9px;border:solid var(--tick);border-width:0 2px 2px 0;
  transform:rotate(45deg) translateY(-1px)}
.opt.on{border-color:var(--accent);background:color-mix(in srgb, var(--accent) 12%, transparent)}
.opt.on .mark{border-color:var(--accent);background:var(--accent)}
.opt.on .mark::after{opacity:1}
.q.invalid input[type=text],.q.invalid textarea{border-color:#d93025}
.q.invalid .opts{outline:1px solid #d93025;outline-offset:6px;border-radius:12px}
.q-err{color:#d93025;font-family:'JetBrains Mono',ui-monospace,monospace;font-size:10px;
  letter-spacing:.14em;text-transform:uppercase;margin-top:9px;display:none}
.q.invalid .q-err{display:block}
body.dark .q-err,body.grad .q-err{color:#ff7676}
body.dark .q.invalid input[type=text],body.dark .q.invalid textarea,
body.grad .q.invalid input[type=text],body.grad .q.invalid textarea{border-color:#ff7676}

/* ---------- кнопки ---------- */
.nav{display:flex;gap:10px;align-items:center;margin-top:30px}
.btn{font-family:'Inter Tight','Inter',sans-serif;font-weight:900;font-size:16px;
  text-transform:uppercase;border:0;border-radius:14px;padding:17px 26px;cursor:pointer;
  transition:opacity .15s;display:inline-flex;align-items:center;justify-content:center;
  gap:8px;text-decoration:none}
.btn-primary{background:var(--accent);color:#fff;flex:1}
.btn-primary:hover{opacity:.9}
.btn-primary:disabled{opacity:.5;cursor:default}
.btn-ghost{background:transparent;color:var(--mute);border:2px solid var(--line);
  padding:17px 18px;font-size:13px;letter-spacing:.1em}
.btn-ghost:hover{color:var(--accent);border-color:var(--accent)}
.note{font-family:'JetBrains Mono',ui-monospace,monospace;font-size:10px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--mute);text-align:center;margin-top:18px}

/* ---------- финал ---------- */
.tick-big{width:70px;height:70px;border-radius:50%;border:2px solid var(--accent);
  color:var(--accent);display:flex;align-items:center;justify-content:center;
  font-size:30px;margin:0 auto 24px}
.hp{position:absolute;left:-9999px}
[hidden]{display:none !important}
.fade{animation:fade .3s ease}
@keyframes fade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}


/* проверка канала */
.q-ok{margin-top:10px;font-size:14px;color:var(--accent)}
.nochan{margin-top:12px}

/* Телефон: один очевидный путь — вопрос, пояснение, ответ, действие. */
@media(max-width:640px){
  .wrap{padding-left:16px;padding-right:16px}
  .screen{padding:72px 0 92px;justify-content:flex-start}
  .step{padding-top:82px}
  .step-head{margin-bottom:22px}
  .step-head .sub{font-size:14px;line-height:1.42}
  .q{margin-bottom:20px;padding:16px;border:1px solid var(--line);border-radius:16px;background:color-mix(in srgb,var(--card) 82%,transparent)}
  .q-label{font-size:17px;line-height:1.28}
  .q-label::before{content:attr(data-order) ' · ';font-family:'JetBrains Mono',ui-monospace,monospace;font-size:10px;letter-spacing:.12em;color:var(--accent);vertical-align:2px}
  .q-hint{font-size:9px;letter-spacing:.1em;line-height:1.4;margin-top:7px;margin-bottom:11px}
  .q-body{margin-top:9px}
  .opt{font-size:16px;line-height:1.32;padding:14px}
  input[type=text],textarea{font-size:16px;padding:15px}
  .nav{position:sticky;bottom:0;z-index:12;margin:12px -16px 0;padding:12px 16px 10px;background:linear-gradient(180deg,transparent 0%,var(--tick) 28%)}
  body.light .nav{background:linear-gradient(180deg,rgba(234,230,219,0) 0%,rgba(234,230,219,.96) 28%)}
  body.grad .nav{background:linear-gradient(180deg,rgba(22,17,45,0) 0%,rgba(22,17,45,.96) 28%)}
  .btn{min-height:52px;font-size:16px;padding:15px 20px}
  .pnum{bottom:22px;right:16px}
}