:root {
  color-scheme: light dark;
  --bg: #fbfbfb;
  --card: #ffffff;
  --text: #3c3c3c;
  --text-soft: #3f3f3f;
  --muted: #8a8a8a;
  --accent: #f57336;
  --accent-dark: #d95f24;
  --dark: #16171a;
  --border: #e6e6e6;
  --chip-bg: #e6e6e6;
  --ok: #f57336;
  --bad: #16171a;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14151a;
    --card: #1d1e23;
    --text: #eeeeee;
    --text-soft: #d9d9d9;
    --muted: #96979e;
    --accent: #f57336;
    --accent-dark: #ff8a54;
    --dark: #0b0c0e;
    --border: #2b2c32;
    --chip-bg: #2a2b31;
    --ok: #f57336;
    --bad: #eeeeee;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Manrope", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.accent { color: var(--accent); }

/* Верхняя чёрная панель */
.topbar {
  background: var(--dark);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar-inner {
  max-width: 780px;
  margin: 0 auto;
  padding: 16px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.logo {
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  white-space: nowrap;
}

.logo-mark {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: var(--accent);
  display: inline-block;
  margin-right: 8px;
}

.progress {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.progress .step {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.6);
}

.progress .step.active {
  background: var(--accent);
  color: white;
}

.app {
  max-width: 780px;
  margin: 0 auto;
  padding: 40px 16px 100px;
}

.section { display: none; }
.section.active { display: block; }

.section-label {
  color: var(--accent);
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}

h1 {
  font-size: 2.6rem;
  line-height: 1.12;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  margin: 0 0 28px;
}

h2 {
  font-size: 1.6rem;
  font-weight: 800;
  text-transform: uppercase;
  margin: 0 0 8px;
  letter-spacing: 0.01em;
}

.intro-grid {
  display: flex;
  gap: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.intro-text { flex: 1.4; min-width: 240px; }
.intro-text p { font-size: 1.05rem; line-height: 1.5; margin: 0; }

.intro-stats {
  display: flex;
  gap: 24px;
  flex: 1;
  min-width: 200px;
}

.stat-num {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-top: 6px;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.chip {
  background: var(--chip-bg);
  color: var(--text-soft);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 10px 18px;
  border-radius: 30px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 20px;
  margin-bottom: 14px;
}

.form-card { margin-top: 8px; }

.card h3 {
  margin: 0 0 14px;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
}

label {
  display: block;
  margin-bottom: 16px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

label:last-child { margin-bottom: 0; }

input[type="text"], input[type="email"], textarea {
  width: 100%;
  margin-top: 8px;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 400;
  font-family: inherit;
  text-transform: none;
}

textarea { resize: vertical; }

.choice-row {
  display: flex;
  gap: 10px;
  margin: 10px 0 4px;
}

.choice-btn {
  flex: 1;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.choice-btn.selected.agree {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.choice-btn.selected.disagree {
  background: var(--dark);
  border-color: var(--dark);
  color: white;
}

.option-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  margin-bottom: 8px;
  cursor: pointer;
  font-size: 0.92rem;
  font-weight: 500;
  transition: border-color 0.15s, background 0.15s;
}

.option-row.selected {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, var(--card));
}

.option-row input { margin-top: 3px; accent-color: var(--accent); }

.hint { color: var(--muted); font-size: 0.92rem; line-height: 1.5; }

.structure {
  white-space: pre-wrap;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 0.85rem;
  color: var(--muted);
  font-family: inherit;
}

.word-count { font-size: 0.85rem; color: var(--muted); font-weight: 500; }

.nav {
  display: flex;
  justify-content: flex-end;
  margin-top: 24px;
}

button.primary {
  background: var(--accent);
  color: white;
  border: none;
  padding: 14px 26px;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s;
}

button.primary:hover { background: var(--accent-dark); }
button.primary:disabled { opacity: 0.5; cursor: not-allowed; }

#submit-status { color: var(--muted); font-size: 0.85rem; margin-top: 12px; }
#submit-status.error { color: var(--accent-dark); font-weight: 600; }

.result-row {
  display: flex;
  justify-content: space-between;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
  font-size: 1rem;
  font-weight: 500;
}

.result-total {
  font-size: 2rem;
  font-weight: 800;
  margin-top: 20px;
  color: var(--text);
}

.result-grade {
  font-size: 1.1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent);
  margin-top: 4px;
  background: var(--chip-bg);
  display: inline-block;
  padding: 8px 16px;
  border-radius: 30px;
}

.error-banner {
  background: color-mix(in srgb, var(--accent) 15%, var(--card));
  border: 1px solid var(--accent);
  color: var(--text);
  padding: 12px 16px;
  border-radius: 10px;
  margin-bottom: 16px;
  font-size: 0.9rem;
}

@media (max-width: 480px) {
  h1 { font-size: 2rem; }
}