/* === 工具箱全局主题 === */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg-primary: #0a0a1a;
  --bg-secondary: #111128;
  --bg-card: rgba(20, 20, 40, 0.7);
  --bg-card-hover: rgba(30, 30, 50, 0.8);
  --bg-card-solid: #1a1a3a;
  --text-primary: #fff;
  --text-secondary: #aaa;
  --text-muted: #555;
  --accent: #00d4ff;
  --accent-hover: #00bfe6;
  --accent-dim: rgba(0, 212, 255, 0.15);
  --danger: #e94560;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 999px;
  --blur: blur(12px);
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.5);
  --transition: 0.2s ease;
}

body {
  background: var(--bg-primary);
  background-image: radial-gradient(circle at 20% 20%, rgba(20, 20, 60, 0.5), transparent 50%);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  min-height: 100vh;
  user-select: none;
  line-height: 1.5;
}

/* --- 顶部导航栏 --- */
.toolbox-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 52px;
  background: rgba(10, 10, 26, 0.85);
  backdrop-filter: var(--blur);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  z-index: 1000;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.toolbox-nav .nav-logo {
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: 0.5px;
}

.toolbox-nav .nav-links {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}

.toolbox-nav .nav-links::-webkit-scrollbar { display: none; }

.toolbox-nav .nav-link {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 13px;
  cursor: pointer;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
  text-decoration: none;
}

.toolbox-nav .nav-link:hover {
  color: var(--text-secondary);
  background: rgba(255,255,255,0.06);
}

.toolbox-nav .nav-link.active {
  color: var(--accent);
  background: var(--accent-dim);
}

/* --- 首页工具卡片网格 --- */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  padding: 88px 28px 32px;
  max-width: 1000px;
  margin: 0 auto;
}

.tool-card {
  background: var(--bg-card);
  backdrop-filter: var(--blur);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: 28px;
  cursor: pointer;
  transition: transform var(--transition), background var(--transition), box-shadow var(--transition), border-color var(--transition);
  text-decoration: none;
  color: inherit;
  display: block;
  box-shadow: var(--shadow);
}

.tool-card:hover {
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  border-color: rgba(0, 212, 255, 0.2);
  box-shadow: var(--shadow-hover), 0 0 20px rgba(0, 212, 255, 0.1);
}

.tool-card .card-icon {
  font-size: 36px;
  margin-bottom: 16px;
}

.tool-card .card-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: 0.3px;
}

.tool-card .card-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- 按钮 --- */
.btn {
  background: var(--bg-card-solid);
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--text-primary);
  padding: 10px 22px;
  border-radius: var(--radius-full);
  font-size: 13px;
  cursor: pointer;
  transition: all var(--transition);
}

.btn:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255,255,255,0.15);
  transform: translateY(-1px);
}

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

.btn-accent {
  background: var(--accent);
  color: #000;
  font-weight: 600;
  border-color: transparent;
}

.btn-accent:hover {
  background: var(--accent-hover);
  box-shadow: 0 4px 12px rgba(0, 212, 255, 0.3);
}

/* --- 空状态 --- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-muted);
  padding: 60px 20px;
  text-align: center;
}

.empty-state .icon { font-size: 48px; margin-bottom: 12px; }
.empty-state p { font-size: 14px; }

/* --- 骨架屏加载 --- */
.skeleton {
  background: linear-gradient(90deg, rgba(30,30,50,0.8) 25%, rgba(40,40,60,0.8) 50%, rgba(30,30,50,0.8) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* --- Toast 提示 --- */
.toast {
  position: fixed;
  top: 64px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background: rgba(20, 20, 40, 0.9);
  backdrop-filter: var(--blur);
  color: var(--text-primary);
  padding: 10px 20px;
  border-radius: var(--radius-full);
  font-size: 13px;
  z-index: 2000;
  opacity: 0;
  transition: all 0.3s ease;
  pointer-events: none;
  border: 1px solid rgba(255,255,255,0.1);
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* --- 响应式 --- */
@media (max-width: 500px) {
  .tool-grid {
    grid-template-columns: 1fr;
    padding: 72px 16px 16px;
    gap: 12px;
  }
  .toolbox-nav { padding: 0 12px; }
  .tool-card { padding: 20px; }
}