:root{
  --bg:#f4f6fb;
  --surface:#ffffff;
  --surface-2:#f8fafc;
  --ink:#0f172a;
  --ink-2:#334155;
  --muted:#64748b;
  --line:#e2e8f0;
  --line-2:#eef2f7;
  --primary:#4f46e5;
  --primary-2:#6366f1;
  --primary-soft:#eef2ff;
  --accent:#22c55e;
  --danger:#ef4444;
  --amber:#f59e0b;
  --radius:16px;
  --radius-sm:10px;
  --shadow-sm:0 1px 2px rgba(15,23,42,.06);
  --shadow:0 10px 30px -12px rgba(15,23,42,.18);
  --shadow-lg:0 24px 60px -20px rgba(15,23,42,.28);
  --font:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:var(--font);
  color:var(--ink);
  background:
    radial-gradient(1100px 500px at 100% -10%, #e0e7ff 0%, transparent 55%),
    radial-gradient(900px 480px at -10% 0%, #d1fae5 0%, transparent 50%),
    var(--bg);
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}

/* ---------- topbar ---------- */
.topbar{
  position:sticky;top:0;z-index:40;
  background:rgba(255,255,255,.82);
  backdrop-filter:saturate(160%) blur(12px);
  border-bottom:1px solid var(--line);
}
.topbar__inner{
  max-width:1400px;margin:0 auto;padding:14px 24px;
  display:flex;align-items:center;gap:24px;
}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.brand__mark{
  width:34px;height:34px;border-radius:10px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--primary),var(--primary-2));
  color:#fff;font-weight:800;font-size:18px;box-shadow:var(--shadow-sm);
}
.brand__name{font-weight:700;letter-spacing:-.02em;font-size:17px}
.brand__accent{color:var(--primary)}
.topbar__nav{display:flex;gap:6px;margin-left:8px}
.topbar__link{
  text-decoration:none;color:var(--ink-2);font-size:14px;font-weight:500;
  padding:8px 12px;border-radius:8px;transition:.15s;
}
.topbar__link:hover{background:var(--surface-2);color:var(--ink)}
.topbar__link.is-active{color:var(--primary);background:var(--primary-soft)}
.topbar__menu{
  margin-left:auto;display:none;flex-direction:column;gap:4px;background:none;border:0;
  padding:8px;cursor:pointer;
}
.topbar__menu span{width:20px;height:2px;background:var(--ink);border-radius:2px;display:block}

/* ---------- layout ---------- */
.layout{
  max-width:1400px;margin:0 auto;padding:28px 24px 40px;
  display:grid;grid-template-columns:minmax(0,440px) minmax(0,1fr);
  gap:28px;align-items:start;
}
.panel,.preview{
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;
}
.panel{position:sticky;top:92px;display:flex;flex-direction:column}
.panel__head{padding:22px 24px 18px;border-bottom:1px solid var(--line-2)}
.panel__title{margin:0;font-size:19px;font-weight:700;letter-spacing:-.02em}
.panel__subtitle{margin:6px 0 0;font-size:13px;color:var(--muted);font-weight:500}

.progress{margin-top:16px;height:8px;background:var(--line);border-radius:99px;position:relative}
.progress__bar{
  position:absolute;inset:0 auto 0 0;width:0;border-radius:99px;
  background:linear-gradient(90deg,var(--primary),var(--primary-2));
  transition:width .45s cubic-bezier(.22,1,.36,1);
  display:flex;align-items:center;justify-content:flex-end;
}
.progress__pct{
  position:absolute;right:0;top:14px;font-size:12px;font-weight:700;color:var(--primary);
  transform:translateX(0);white-space:nowrap;
}
.stepper{display:flex;gap:6px;margin-top:22px;flex-wrap:wrap}
.stepper__dot{
  width:100%;max-width:44px;height:4px;border-radius:4px;background:var(--line);
  transition:.3s;flex:1;
}
.stepper__dot.done{background:var(--primary)}
.stepper__dot.current{background:var(--primary-2)}

/* ---------- form ---------- */
.form__body{padding:22px 24px 8px;max-height:min(58vh,560px);overflow:auto}
.form__body::-webkit-scrollbar{width:8px}
.form__body::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:8px}

.field{margin-bottom:18px;animation:fadeUp .35s cubic-bezier(.22,1,.36,1) both}
@keyframes fadeUp{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.field__label{display:block;font-size:13px;font-weight:600;color:var(--ink-2);margin-bottom:8px}
.field__label .req{color:var(--danger);margin-left:2px}
.field__hint{font-size:12px;color:var(--muted);margin-top:6px}
.field__error{font-size:12px;color:var(--danger);margin-top:6px;display:none}
.field.has-error .field__error{display:block}
.field.has-error input,.field.has-error select,.field.has-error textarea{border-color:var(--danger);background:#fef2f2}
.field.highlight{
  background:linear-gradient(90deg,var(--primary-soft),rgba(238,242,255,0));
  border-radius:12px;
  box-shadow:inset 0 0 0 1.5px var(--primary-2);
  animation:fieldPulse 1.4s ease;
  padding:10px;margin-left:-10px;margin-right:-10px;
}
@keyframes fieldPulse{
  0%{background-color:rgba(224,231,255,.9);box-shadow:inset 0 0 0 1.5px var(--primary)}
  100%{background-color:transparent;box-shadow:inset 0 0 0 1.5px var(--primary-2)}
}

input[type="text"],input[type="number"],input[type="date"],select,textarea{
  width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:var(--radius-sm);
  font-family:inherit;font-size:14px;color:var(--ink);background:var(--surface-2);
  transition:.15s;outline:none;
}
input:focus,select:focus,textarea:focus{
  border-color:var(--primary);background:#fff;
  box-shadow:0 0 0 4px rgba(79,70,229,.12);
}
select{appearance:none;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24'><path fill='%2364748b' d='M7 10l5 5 5-5z'/></svg>");background-repeat:no-repeat;background-position:right 12px center;padding-right:36px}
textarea{min-height:90px;resize:vertical}

.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.grid3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:14px}
@media(max-width:520px){.grid2,.grid3{grid-template-columns:1fr}}

.subcard{
  border:1px solid var(--line);border-radius:var(--radius-sm);padding:16px;
  background:var(--surface-2);margin-bottom:16px;
}
.subcard__title{
  font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;
  color:var(--primary);margin:0 0 14px;display:flex;align-items:center;gap:8px;
}
.subcard__title::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--primary)}

/* segmented choice */
.segment{display:flex;gap:8px;flex-wrap:wrap}
.segment input{position:absolute;opacity:0;pointer-events:none}
.segment label{
  border:1.5px solid var(--line);background:#fff;border-radius:var(--radius-sm);
  padding:11px 18px;font-size:14px;font-weight:600;cursor:pointer;transition:.15s;color:var(--ink-2);
}
.segment label:hover{border-color:#c7d2fe}
.segment input:checked + label{
  border-color:var(--primary);background:var(--primary-soft);color:var(--primary);
  box-shadow:0 0 0 3px rgba(79,70,229,.1);
}

/* actions */
.form__actions{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:16px 24px;border-top:1px solid var(--line-2);background:var(--surface-2);
}
.form__actions-right{display:flex;gap:10px}
.btn{
  display:inline-flex;align-items:center;gap:8px;border:1.5px solid transparent;
  font-family:inherit;font-size:14px;font-weight:600;padding:11px 18px;border-radius:var(--radius-sm);
  cursor:pointer;transition:.15s;text-decoration:none;
}
.btn svg{flex:none}
.btn--primary{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;box-shadow:0 8px 20px -8px rgba(79,70,229,.7)}
.btn--primary:hover{transform:translateY(-1px);box-shadow:0 12px 24px -8px rgba(79,70,229,.75)}
.btn--ghost{background:#fff;border-color:var(--line);color:var(--ink-2)}
.btn--ghost:hover{border-color:#cbd5e1;color:var(--ink)}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none!important}

/* ---------- preview ---------- */
.preview{display:flex;flex-direction:column;min-height:70vh}
.preview__head{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:16px 22px;border-bottom:1px solid var(--line-2);background:var(--surface-2);
}
.preview__label{font-size:13px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.05em}
.preview__tools{display:flex;gap:8px}
.chip{
  border:1.5px solid var(--line);background:#fff;border-radius:99px;padding:8px 14px;
  font-family:inherit;font-size:13px;font-weight:600;color:var(--ink-2);cursor:pointer;transition:.15s;
}
.chip:hover{border-color:var(--primary);color:var(--primary)}
.chip--mobile{display:none}
.preview__scroll{padding:26px;overflow:auto;max-height:calc(100vh - 200px)}
.paper{
  max-width:760px;margin:0 auto;background:#fff;border:1px solid var(--line);
  border-radius:12px;padding:52px 56px;box-shadow:var(--shadow);
  font-size:12.5px;line-height:1.75;color:#1e293b;
}
.paper h2{font-size:16px;text-align:center;margin:0 0 4px;letter-spacing:-.01em}
.paper h3{font-size:12.5px;margin:20px 0 8px;color:var(--ink)}
.paper p{margin:0 0 10px;text-align:justify}
.paper .fill{color:var(--primary);font-weight:600;border-bottom:1.5px dotted var(--primary-2);padding:0 3px;min-width:40px;display:inline-block;text-align:center}
.paper .fill:empty::after{content:"________"}
.paper .fill{scroll-margin:120px}
.paper .fill.pulse{
  background:#fef08a;border-radius:5px;
  box-shadow:0 0 0 3px rgba(250,204,21,.55);
  animation:fillPulse .7s ease;
}
@keyframes fillPulse{
  0%{background:#fde68a;box-shadow:0 0 0 6px rgba(250,204,21,.35)}
  100%{background:#fef9c3;box-shadow:0 0 0 3px rgba(250,204,21,.55)}
}
.paper .sign{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin-top:48px}
.paper .sign div{border-top:1.5px solid var(--ink);padding-top:8px;font-size:11px;font-weight:600;text-align:center}
.paper .sub{padding-left:22px}
.paper .muted{color:var(--muted)}

/* toast */
.toast{
  position:absolute;left:50%;bottom:80px;transform:translate(-50%,14px);
  background:var(--ink);color:#fff;font-size:13px;font-weight:600;padding:10px 18px;border-radius:99px;
  opacity:0;pointer-events:none;transition:.3s;box-shadow:var(--shadow-lg);z-index:20;
}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* footer */
.footer{max-width:1400px;margin:0 auto;padding:0 24px 40px;color:var(--muted);font-size:12px;text-align:center}

/* ---------- responsive ---------- */
@media(max-width:1080px){
  .layout{grid-template-columns:1fr;gap:18px}
  .panel{position:static}
  .form__body{max-height:none}
  .preview{min-height:auto}
  .preview__scroll{max-height:60vh;padding:16px}
  .paper{padding:32px 24px}
  .chip--mobile{display:inline-flex}
  .preview__scroll{display:none}
  .preview.open .preview__scroll{display:block}
}
@media(max-width:640px){
  .topbar__nav{display:none}
  .topbar__menu{display:flex}
  .layout{padding:16px 12px 30px}
  .panel__head{padding:18px 18px 14px}
  .form__body{padding:18px 18px 6px}
  .form__actions{padding:14px 18px;flex-wrap:wrap}
}
@media print{
  .topbar,.panel,.preview__head,.footer,.toast{display:none!important}
  .layout{display:block;padding:0;max-width:none}
  .preview{border:0;box-shadow:none}
  .preview__scroll{max-height:none;overflow:visible;padding:0;display:block!important}
  .paper{border:0;box-shadow:none;max-width:none;padding:0;font-size:11pt}
  .paper .fill{color:#000;border-bottom:0;font-weight:600}
  body{background:#fff}
}