:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --ok: #22c55e;
  --bad: #ef4444;
  --warn: #f59e0b;
  --radius: 12px;
  --tap: 48px;
  /* stały pasek: 2 rzędy przycisków + safe-area */
  --nav-bar-height: 11.5rem;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

body {
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom)
    env(safe-area-inset-left);
}

#app {
  max-width: 640px;
  margin: 0 auto;
  padding: 1rem 1rem calc(var(--nav-bar-height) + env(safe-area-inset-bottom, 0px));
}

#app.quiz-active {
  padding-bottom: calc(var(--nav-bar-height) + 1rem + env(safe-area-inset-bottom, 0px));
}

h1 {
  font-size: 1.35rem;
  margin: 0 0 0.5rem;
}

.sub {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 1.25rem;
}

.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1rem;
  margin-bottom: 1rem;
}

.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: var(--tap);
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  margin-bottom: 0.75rem;
}

.btn-primary {
  background: var(--accent);
  color: #0f172a;
}

.btn-secondary {
  background: #334155;
  color: var(--text);
}

.btn-ghost {
  background: transparent;
  border: 1px solid #475569;
  color: var(--text);
}

.btn-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.btn-row .btn {
  margin: 0;
}

.nav-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 50;
  padding: 0.75rem 1rem calc(0.75rem + env(safe-area-inset-bottom, 0px));
  background: rgba(15, 23, 42, 0.98);
  border-top: 1px solid #334155;
  box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.35);
}

.nav-bar-inner {
  max-width: 640px;
  margin: 0 auto;
}

.nav-bar .btn-row {
  margin-bottom: 0.5rem;
}

.meta {
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

.question-text {
  font-size: 1.05rem;
  line-height: 1.45;
  margin-bottom: 1rem;
}

.answers {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.answer {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  padding: 0.85rem 0.9rem;
  border-radius: var(--radius);
  border: 2px solid #334155;
  background: #0f172a;
  min-height: var(--tap);
  cursor: pointer;
  text-align: left;
}

.answer input {
  margin-top: 0.2rem;
  width: 1.2rem;
  height: 1.2rem;
  flex-shrink: 0;
}

.answer.selected {
  border-color: var(--accent);
}

.answer.correct {
  border-color: var(--ok);
  background: rgba(34, 197, 94, 0.12);
}

.answer.incorrect {
  border-color: var(--bad);
  background: rgba(239, 68, 68, 0.1);
}

.feedback {
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
  font-weight: 600;
}

.feedback.ok {
  background: rgba(34, 197, 94, 0.15);
  color: #86efac;
}

.feedback.bad {
  background: rgba(239, 68, 68, 0.15);
  color: #fca5a5;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
  text-align: center;
  margin-bottom: 1rem;
}

.stat {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 0.75rem 0.5rem;
}

.stat strong {
  display: block;
  font-size: 1.4rem;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 100;
}

.modal {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.25rem;
  max-width: 400px;
  width: 100%;
}

.modal p {
  margin: 0 0 1rem;
  line-height: 1.4;
}

.hidden {
  display: none !important;
}