/* ===== 火灾闯关小游戏 — 共享样式 ===== */
:root {
  --color-bg: #0d0d0d;
  --color-bg-card: #1a1a1a;
  --color-bg-card-hover: #222;
  --color-primary: #ff4500;
  --color-primary-hover: #ff6a00;
  --color-accent: #ffd700;
  --color-danger: #dc2626;
  --color-success: #22c55e;
  --color-text: #e0e0e0;
  --color-text-dim: #999;
  --color-border: #333;
  --gradient-fire: linear-gradient(135deg, #ff4500, #ff8c00, #ffd700);
  --gradient-bg: linear-gradient(180deg, #0d0d0d 0%, #1a0a0a 50%, #0d0d0d 100%);
  --shadow-card: 0 4px 20px rgba(255, 69, 0, 0.15);
  --shadow-card-hover: 0 6px 30px rgba(255, 69, 0, 0.3);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.25s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--gradient-bg);
  color: var(--color-text);
  min-height: 100vh;
  line-height: 1.6;
}

/* ===== 导航栏 ===== */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: rgba(13, 13, 13, 0.9);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar .logo {
  font-size: 1.2rem;
  font-weight: 700;
  background: var(--gradient-fire);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar .nav-links {
  display: flex;
  gap: 16px;
  list-style: none;
}

.navbar .nav-links a {
  color: var(--color-text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
}

.navbar .nav-links a:hover {
  color: var(--color-primary);
  background: rgba(255, 69, 0, 0.1);
}

/* ===== 标题渐变 ===== */
.gradient-title {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--gradient-fire);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}

/* ===== 卡片 ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  padding: 20px;
  max-width: 1000px;
  margin: 0 auto;
}

.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  text-decoration: none;
  color: var(--color-text);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-primary);
}

.card:active {
  transform: translateY(-1px);
}

.card .card-icon {
  font-size: 2.5rem;
}

.card .card-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary);
}

.card .card-desc {
  font-size: 0.9rem;
  color: var(--color-text-dim);
  line-height: 1.5;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-fire);
  color: #fff;
  box-shadow: 0 4px 15px rgba(255, 69, 0, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(255, 69, 0, 0.5);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--color-bg-card);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-danger {
  background: var(--color-danger);
  color: #fff;
}

.btn-danger:hover {
  background: #b91c1c;
  transform: translateY(-2px);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* ===== 容器 ===== */
.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 20px;
}

.section {
  padding: 40px 20px;
  text-align: center;
}

/* ===== 状态文字 ===== */
.text-dim {
  color: var(--color-text-dim);
}

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

.text-center {
  text-align: center;
}

/* ===== 响应式 ===== */
@media (max-width: 600px) {
  .gradient-title {
    font-size: 1.8rem;
  }

  .card-grid {
    grid-template-columns: 1fr;
    padding: 12px;
  }

  .navbar {
    flex-direction: column;
    gap: 8px;
    padding: 10px 12px;
  }

  .navbar .nav-links {
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
  }

  .container {
    padding: 12px;
  }

  .section {
    padding: 24px 12px;
  }
}