:root {
  --bg-color: #121212;
  --card-bg: #1e1e1e;
  --text-color: #e0e0e0;
  --accent-color: #00adb5;
  --accent-hover: #008c93;
  --correct-color: #2e7d32;
  --wrong-color: #c62828;
  --border-color: #333;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  min-height: 100vh;
}

.navbar {
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-weight: bold;
  font-size: 1.2rem;
  color: var(--accent-color);
}

.timer-box {
  font-size: 1.1rem;
  font-weight: bold;
  background: #2a2a2a;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  color: #ffb74d;
}

.container {
  max-width: 850px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.center { text-align: center; }

.badge {
  background-color: var(--accent-color);
  color: #fff;
  padding: 0.3rem 0.6rem;
  border-radius: 4px;
  font-size: 0.85rem;
  font-weight: bold;
}

.count-text { color: #888; font-size: 0.9rem; }

.exam-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.options-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.option-btn {
  background-color: #2a2a2a;
  border: 1px solid var(--border-color);
  color: var(--text-color);
  padding: 1rem;
  border-radius: 6px;
  text-align: left;
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.2s;
}

.option-btn:hover { background-color: #333; }

.option-btn.selected {
  border-color: var(--accent-color);
  background-color: #00adb522;
  font-weight: bold;
}

.controls {
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-weight: bold;
  font-size: 0.95rem;
}

.btn-primary { background-color: var(--accent-color); color: white; }
.btn-primary:hover { background-color: var(--accent-hover); }
.btn-secondary { background-color: #333; color: white; }
.btn-secondary:hover { background-color: #444; }
.btn-danger { background-color: var(--wrong-color); color: white; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
  gap: 0.5rem;
  margin-top: 1rem;
}

.grid-item {
  background: #2a2a2a;
  border: 1px solid var(--border-color);
  color: #fff;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  cursor: pointer;
  font-weight: bold;
  font-size: 0.85rem;
}

.grid-item.answered { background-color: var(--accent-color); }
.grid-item.current { border: 2px solid #fff; }

/* Sonuç Ekranı */
.result-card.pass { border-left: 6px solid var(--correct-color); }
.result-card.fail { border-left: 6px solid var(--wrong-color); }

.review-box {
  border-left: 4px solid #555;
  padding: 1rem;
  margin-bottom: 1rem;
  background-color: #252525;
  border-radius: 4px;
}

.review-box.correct { border-left-color: var(--correct-color); }
.review-box.wrong { border-left-color: var(--wrong-color); }

.correct-style { color: #81c784; font-weight: bold; }
.wrong-style { color: #e57373; text-decoration: line-through; }