/* 全局变量 */
:root {
    --primary-color: #6c757d; /* 更柔和的灰色调 */
    --secondary-color: #868e96;
    --accent-color: #adb5bd;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --success-color: #86c232; /* 更柔和的绿色 */
    --bg-gradient: linear-gradient(120deg, #a8edea 0%, #fed6e3 100%); /* 更柔和的渐变 */
    --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}

/* 全局样式 */
body {
    background: var(--light-color);
    color: var(--dark-color);
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    transition: var(--transition);
    padding-bottom: 100px;
}

/* 页眉样式 */
.navbar {
    background: linear-gradient(135deg, #495057, #6c757d) !important; /* 深灰色渐变，确保文字清晰 */
    color: #f8f9fa;
    box-shadow: 0 4px 12px rgba(108, 117, 125, 0.15);
}

.navbar-brand {
    color: #f8f9fa !important;
    font-weight: 600;
    font-size: 1.5rem;
}

.navbar-brand:hover {
    color: #e9ecef !important;
}

.navbar .text-muted {
    color: #e9ecef !important;
}

.navbar .btn-outline-light {
    color: #f8f9fa;
    border-color: #f8f9fa;
}

.navbar .btn-outline-light:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* 欢迎横幅 */
.welcome-banner {
    background: linear-gradient(120deg, #4a6fa6 0%, #6b5e98 100%) !important; /* 柔和但深色的渐变，确保文字清晰 */
    color: #ffffff;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.welcome-banner h1, .welcome-banner .display-4 {
    color: #ffffff;
}

.welcome-banner p, .welcome-banner .lead {
    color: #e9ecef;
}

.welcome-banner:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
}



/* 瀑布流布局 */
.masonry-layout {
    column-gap: 1.5rem;
    transition: var(--transition);
}

.category-section {
    break-inside: avoid;
    margin-bottom: 1.5rem;
}

/* 分类标题 */
.category-header {
    padding: 0.5rem 1rem;
    border-radius: 8px;
    background: rgba(108, 117, 125, 0.1); /* 更柔和的颜色 */
    backdrop-filter: blur(10px);
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}



.category-title {
    color: #6c757d; /* 柔和的灰色 */
    font-weight: 600;
    font-size: 1.4rem;
}

.category-icon {
    font-size: 1.8rem;
    color: #6c757d; /* 柔和的灰色 */
}

.category-count {
    font-size: 0.85rem;
    padding: 0.25rem 0.75rem;
}

/* 工具卡片 */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 1.25rem;
    margin-top: 0.75rem;
}

.tool-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    height: 100%;
    border: none;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 20px rgba(0, 0, 0, 0.15);
    z-index: 10;
}



.tool-icon {
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(108, 117, 125, 0.1); /* 更柔和的灰色调 */
    border-radius: 50%;
    margin: 0 auto;
}

.tool-icon img {
    width: 45px;
    height: 45px;
    object-fit: contain;
}

.tool-name {
    color: var(--dark-color);
    font-size: 1.1rem;
    margin-top: 0.5rem;
}



.tool-desc {
    font-size: 0.9rem;
    min-height: 40px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 分类筛选按钮样式 */
.filter-section {
    background: white;
    padding: 1rem;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    margin-bottom: 1.5rem;
}

.filter-btn {
    border-radius: 20px;
    transition: var(--transition);
    border: 1px solid #dee2e6;
}

.filter-btn:hover {
    background: var(--primary-color);
    color: white !important;
    border-color: var(--primary-color);
}

.filter-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* 工具卡片容器 */
.tools-container {
    /* 移除瀑布流布局 */
}

.category-section {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.category-section:not(:last-child) {
    margin-bottom: 1.5rem;
}

/* 展开/折叠动画 */
.tools-grid {
    max-height: 1000px;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.tools-grid.collapsed {
    max-height: 0;
    opacity: 0;
}

.toggle-category {
    cursor: pointer;
    transition: transform 0.3s ease;
}

.toggle-category.rotated {
    transform: rotate(180deg);
}

/* 页脚样式 - 柔和配色 */
footer {
    background: linear-gradient(135deg, #aebfc9, #9aaab3) !important; /* 柔和的灰色调 */
    color: #495057;
    margin-top: 3rem;
    box-shadow: 0 -4px 12px rgba(108, 117, 125, 0.15);
    padding: 2rem 0;
}

footer a {
    color: #6c757d; /* 更柔和的颜色 */
}

footer a:hover {
    color: #495057; /* 更深一点的柔和灰色 */
    text-decoration: underline;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .welcome-banner h1 {
        font-size: 1.8rem;
    }

    .category-title {
        font-size: 1.2rem;
    }

    .tools-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    }

    .tool-icon {
        width: 60px;
        height: 60px;
    }
}

@media (max-width: 480px) {
    .category-header {
        flex-direction: column;
        text-align: center;
    }

    .tools-grid {
        grid-template-columns: 1fr;
    }

    .welcome-banner h1 {
        font-size: 1.5rem;
    }

    .welcome-banner p {
        font-size: 1rem;
    }
}