/* ========================================
   导航主页样式
   ======================================== */

/* 页面专属配色 - 暗蓝色 */
:root {
    --primary-color: #4a6fa5;
    --primary-hover: #5f85b8;
    --primary-light: rgba(74, 111, 165, 0.08);
    --primary-light-hover: rgba(74, 111, 165, 0.12);
    --border-color-hover: rgba(74, 111, 165, 0.2);
    --shadow-primary: 0 0 16px rgba(74, 111, 165, 0.15);
}

/* ========== 顶部导航栏 ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

/* Logo区域 */
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
    cursor: default;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #2d4a6e 100%);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: white;
    box-shadow: var(--shadow-primary);
    transition: transform var(--transition-normal);
}

.logo:hover .logo-icon {
    transform: rotate(15deg) scale(1.05);
}

.logo-text h1 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
}

.logo-text p {
    font-size: 12px;
    color: var(--text-muted);
}

/* 搜索框 */
.search-box {
    flex: 1;
    max-width: 500px;
    position: relative;
    transition: transform var(--transition-fast);
}

.search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 18px;
    transition: color var(--transition-fast);
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: 14px 16px 14px 48px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-size: 15px;
    font-family: var(--font-sans);
    outline: none;
    transition: all var(--transition-normal);
}

.search-input::placeholder {
    color: var(--text-muted);
}

.search-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px var(--primary-light);
    background: var(--bg-card-hover);
}

.search-input:focus ~ .search-icon,
.search-box:hover .search-icon {
    color: var(--primary-color);
}

/* 快速链接 */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

/* ========== 主内容区 ========== */
.main-content {
    padding-top: 100px;
    padding-bottom: 100px;
    position: relative;
    z-index: 10;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 搜索引擎选择器 */
.search-section {
    margin-bottom: 40px;
}

.search-engine-selector {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.engine-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    backdrop-filter: blur(10px);
}

.engine-btn:hover {
    background: var(--primary-light);
    border-color: var(--border-color-hover);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.engine-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-primary);
    transform: translateY(-2px);
}

/* ========== 导航分类 ========== */
.nav-categories {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.category-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

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

.category-header {
    padding: 20px 24px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
}

.category-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--primary-color);
}

.category-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.category-count {
    margin-left: auto;
    font-size: 12px;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.05);
    padding: 4px 10px;
    border-radius: 10px;
    transition: all var(--transition-fast);
}

.category-card:hover .category-count {
    background: var(--primary-light);
    color: var(--primary-color);
}

.category-body {
    padding: 16px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 14px;
    text-decoration: none;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 3px;
    height: 100%;
    background: var(--primary-color);
    transform: scaleY(0);
    transition: transform var(--transition-fast);
    border-radius: 2px;
}

.nav-link:hover::before {
    transform: scaleY(1);
}

.nav-link:hover {
    background: var(--primary-light);
    color: var(--text-primary);
    transform: translateX(4px);
}

.nav-link-icon {
    width: 28px;
    height: 28px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: var(--primary-color);
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.nav-link:hover .nav-link-icon {
    background: var(--primary-light);
    color: var(--primary-color);
}

.nav-link-text {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
}

/* 空状态 */
.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.3;
}

.empty-state p {
    font-size: 14px;
}

/* ========== 底部版权 ========== */
.footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 16px 24px;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-top: 1px solid var(--border-color);
    z-index: 100;
    transition: all var(--transition-normal);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    font-size: 12px;
    color: var(--text-muted);
}

.footer-content p {
    margin: 0;
}

.footer-content a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-content a:hover {
    color: var(--primary-color);
}

/* ========== 加载动画 ========== */
.loading-spinner {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    gap: 16px;
}

.loading-spinner .spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading-spinner p {
    font-size: 14px;
    color: var(--text-muted);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 淡入动画 */
.category-card {
    animation: fadeInUp 0.3s ease forwards;
    opacity: 0;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.category-card:nth-child(1) { animation-delay: 0.05s; }
.category-card:nth-child(2) { animation-delay: 0.1s; }
.category-card:nth-child(3) { animation-delay: 0.15s; }
.category-card:nth-child(4) { animation-delay: 0.2s; }
.category-card:nth-child(5) { animation-delay: 0.25s; }
.category-card:nth-child(6) { animation-delay: 0.3s; }
.category-card:nth-child(7) { animation-delay: 0.35s; }
.category-card:nth-child(8) { animation-delay: 0.4s; }

/* ========== 响应式 ========== */
@media (max-width: 1200px) {
    .nav-container {
        padding: 16px;
    }
    
    .nav-actions .btn span {
        display: none;
    }
    
    .nav-actions .btn {
        padding: 12px;
    }
}

@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 16px;
    }

    .logo {
        align-self: flex-start;
    }

    .search-box {
        width: 100%;
        max-width: none;
    }

    .nav-actions {
        width: 100%;
        justify-content: center;
    }

    .nav-actions .btn span {
        display: inline;
    }

    .main-content {
        padding-top: 220px;
    }

    .nav-categories {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .category-body {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-content {
        flex-direction: column;
        gap: 8px;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding-top: 240px;
    }

    .category-body {
        grid-template-columns: 1fr;
    }

    .search-engine-selector {
        gap: 8px;
    }

    .engine-btn {
        padding: 8px 14px;
        font-size: 12px;
    }

    .engine-btn span {
        display: none;
    }

    .logo-icon {
        width: 40px;
        height: 40px;
        font-size: 20px;
    }

    .logo-text h1 {
        font-size: 16px;
    }
}