:root {
  --bg-gradient-start: #6a11cb;
  --bg-gradient-end: #2575fc;
  --card-bg: #ffffff;
  --text-color: #222;
  --muted: #666;
  --accent: #2575fc;
  --weak: #e74c3c;
  --medium: #f1c40f;
  --strong: #2ecc71;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
  padding: 20px;
}

.app {
  width: 100%;
  max-width: 420px;
}

.tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
}

.tab-btn {
  flex: 1;
  padding: 12px 8px;
  border: none;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.35);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease;
}

.tab-btn:hover {
  background: rgba(255, 255, 255, 0.5);
}

.tab-btn.active {
  background: var(--card-bg);
  color: var(--text-color);
}

.card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: 32px;
  width: 100%;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

h1 {
  margin: 0 0 24px;
  text-align: center;
  font-size: 1.5rem;
  color: var(--text-color);
}

.password-display {
  display: flex;
  gap: 8px;
  margin-bottom: 8px;
}

#passwordOutput {
  flex: 1;
  font-size: 1.15rem;
  letter-spacing: 1px;
  padding: 12px 14px;
  border-radius: 10px;
  border: 2px solid #e0e0e0;
  background: #f7f8fc;
  color: var(--text-color);
  font-family: "Courier New", monospace;
  min-width: 0;
}

#copyBtn {
  border: none;
  background: var(--accent);
  color: white;
  font-size: 1.2rem;
  width: 48px;
  border-radius: 10px;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease;
}

#copyBtn:hover {
  background: #1a5edb;
}

#copyBtn:active {
  transform: scale(0.92);
}

.feedback {
  height: 18px;
  margin: 0 0 12px;
  font-size: 0.85rem;
  color: var(--strong);
  text-align: center;
}

.strength {
  height: 6px;
  background: #eee;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 4px;
}

.strength-bar {
  height: 100%;
  width: 0%;
  background: var(--weak);
  transition: width 0.3s ease, background 0.3s ease;
}

.strength-label {
  margin: 0 0 20px;
  font-size: 0.8rem;
  color: var(--muted);
  text-align: right;
}

.option-row {
  margin-bottom: 16px;
}

.option-row label {
  font-size: 0.9rem;
  color: var(--text-color);
  display: flex;
  justify-content: space-between;
}

#lengthRange {
  width: 100%;
  margin-top: 8px;
  accent-color: var(--accent);
}

.checkbox-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.checkbox-row label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  cursor: pointer;
}

.checkbox-row input {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
}

.generate-btn {
  width: 100%;
  padding: 14px;
  font-size: 1rem;
  font-weight: 600;
  color: white;
  background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.generate-btn:hover {
  opacity: 0.92;
}

.generate-btn:active {
  transform: scale(0.98);
}

@media (max-width: 420px) {
  .checkbox-row {
    grid-template-columns: 1fr;
  }
}

.megasena-info {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.5;
  margin: 0 0 20px;
}

.games-output {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.game-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.game-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  min-width: 52px;
}

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

.ball {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
}

.hot-ball {
  background: #f7f8fc;
  color: var(--text-color);
  border: 2px solid var(--accent);
}

.hot-numbers-details {
  margin-top: 20px;
  font-size: 0.85rem;
  color: var(--muted);
}

.hot-numbers-details summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--accent);
}

.hot-numbers-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}

.disclaimer {
  margin-top: 20px;
  font-size: 0.75rem;
  color: var(--muted);
  line-height: 1.4;
}