:root {
  --background: #0a0a0f;
  --foreground: #f5f5f7;
  --muted: #1a1a22;
  --muted-foreground: #9ca3af;
  --card: #14141c;
  --border: #2a2a35;
  --primary: #ffb800;
  --primary-foreground: #0a0a0f;
  --destructive: #ef4444;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--background);
  color: var(--foreground);
  -webkit-font-smoothing: antialiased;
}
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input { font-family: inherit; }

.main { min-height: 100vh; display: flex; padding: 40px 16px; }
.center { align-items: center; justify-content: center; }
.col { flex-direction: column; }

.intro { width: 100%; max-width: 680px; text-align: center; margin: auto; }
.intro img { width: 100%; border-radius: 18px; margin-bottom: 40px; display: block; }
.intro h1 { font-size: 32px; font-weight: 700; line-height: 1.2; margin-bottom: 24px; }
.intro p { color: var(--muted-foreground); font-size: 18px; margin: 0 auto 32px; max-width: 560px; }

.btn-primary {
  background: var(--primary); color: var(--primary-foreground);
  font-weight: 600; padding: 16px 48px; border-radius: 8px;
  transition: opacity .2s; font-size: 16px;
}
.btn-primary:hover { opacity: .9; }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; }

.quiz { flex: 1; padding: 24px 16px; }
@media (min-width: 768px) {
  .quiz { padding: 64px; }
  .intro h1 { font-size: 40px; }
}
.quiz-title { font-size: 24px; font-weight: 700; margin-bottom: 32px; max-width: 1100px; }
@media (min-width: 768px) { .quiz-title { font-size: 36px; margin-bottom: 48px; } }

.options { display: grid; grid-template-columns: 1fr; gap: 16px; max-width: 1200px; }
@media (min-width: 768px) { .options { grid-template-columns: 1fr 1fr; } }

.option {
  display: flex; align-items: center; gap: 16px; text-align: left;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; padding: 20px; transition: border-color .2s, background .2s;
  width: 100%;
}
.option:hover { border-color: rgba(255,255,255,.3); }
.option.active { border-color: var(--primary); background: rgba(255, 184, 0, .1); }
.radio {
  flex-shrink: 0; width: 24px; height: 24px; border-radius: 50%;
  border: 2px solid rgba(255,255,255,.4); display: flex;
  align-items: center; justify-content: center;
}
.option.active .radio { border-color: var(--primary); }
.radio-dot { width: 12px; height: 12px; border-radius: 50%; background: var(--primary); display: none; }
.option.active .radio-dot { display: block; }
.option-text { font-size: 15px; font-weight: 500; }

.footer { margin-top: 40px; }
.footer-row { display: flex; align-items: flex-end; gap: 16px; }
.progress-wrap { flex: 1; position: relative; padding-top: 24px; }
.progress-label {
  position: absolute; top: -4px; color: var(--primary);
  font-weight: 700; font-size: 14px; transition: left .3s;
}
.progress-bar { height: 6px; width: 100%; background: var(--muted); border-radius: 999px; position: relative; overflow: visible; }
.progress-fill {
  height: 100%; background: var(--primary); border-radius: 999px;
  box-shadow: 0 0 12px var(--primary); transition: width .3s;
}
.progress-dot {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 12px; height: 12px; border-radius: 50%; background: var(--primary); transition: left .3s;
}
.icon-btn {
  width: 48px; height: 48px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--card);
  display: flex; align-items: center; justify-content: center;
  transition: border-color .2s;
}
.icon-btn:hover { border-color: rgba(255,255,255,.3); }
.next-btn {
  background: var(--primary); color: var(--primary-foreground);
  font-weight: 600; padding: 0 24px; height: 48px; border-radius: 8px;
  display: inline-flex; align-items: center; gap: 8px; transition: opacity .2s;
}
@media (min-width: 768px) { .next-btn { padding: 0 32px; } }
.next-btn:hover { opacity: .9; }
.next-btn:disabled { opacity: .5; cursor: not-allowed; }

.form-wrap { width: 100%; max-width: 420px; margin: auto; }
.form-wrap h1 { font-size: 28px; font-weight: 700; text-align: center; margin-bottom: 8px; }
.form-wrap .sub { color: var(--muted-foreground); text-align: center; margin-bottom: 32px; }
.form-field {
  width: 100%; background: var(--card); border: 1px solid var(--border);
  border-radius: 8px; padding: 14px 16px; color: var(--foreground);
  font-size: 16px; outline: none; transition: border-color .2s; margin-bottom: 16px;
}
.form-field:focus { border-color: var(--primary); }
.error { color: var(--destructive); font-size: 14px; margin-top: 8px; }
.link-btn { display: block; width: 100%; text-align: center; color: var(--muted-foreground); font-size: 14px; margin-top: 12px; padding: 8px; transition: color .2s; }
.link-btn:hover { color: var(--foreground); }

.done { max-width: 560px; text-align: center; margin: auto; }
.done h1 { font-size: 32px; font-weight: 700; margin-bottom: 16px; }
@media (min-width: 768px) { .done h1 { font-size: 40px; } }
.done p { color: var(--muted-foreground); font-size: 18px; margin-bottom: 32px; }

.icon { width: 20px; height: 20px; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }