/* 全局样式 */
:root {
    --primary-color: #3772ff;
    --secondary-color: #f45d48;
    --accent-color: #7e6bf2;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --gray-color: #6c757d;
    --success-color: #20c997;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #0dcaf0;
    --border-radius: 0.375rem;
    --box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --hover-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    color: var(--dark-color);
    background-color: #f9fafb;
    line-height: 1.6;
}

/* 顶部栏样式 */
.top-bar {
    font-size: 0.85rem;
}

.top-bar a:hover {
    color: var(--primary-color) !important;
}

#theme-toggle {
    cursor: pointer;
    color: var(--gray-color);
}

#theme-toggle:hover {
    color: var(--primary-color);
}

/* 导航栏样式 */
.navbar {
    padding: 0.75rem 0;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
}

.navbar-nav .nav-link {
    color: var(--dark-color);
    font-weight: 500;
    padding: 0.5rem 1rem;
    transition: var(--transition);
}

.navbar-nav .nav-link:hover {
    color: var(--primary-color);
}

.dropdown-menu {
    border: none;
    box-shadow: var(--box-shadow);
    padding: 0.5rem;
}

.dropdown-item {
    padding: 0.5rem 1rem;
    font-weight: 500;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.dropdown-item:hover {
    background-color: rgba(55, 114, 255, 0.1);
    color: var(--primary-color);
}

/* 搜索框样式 */
.input-group {
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 0 0.25rem rgba(0, 0, 0, 0.1);
}

.input-group .form-control {
    border: 1px solid #e0e3e8;
    padding: 0.625rem 1rem;
}

.input-group .form-control:focus {
    box-shadow: none;
    border-color: var(--primary-color);
}

.input-group .btn {
    padding: 0.625rem 1rem;
}

/* 页面标题样式 */
.section-title {
    font-weight: 700;
    margin-bottom: 1.5rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 0;
    width: 2.5rem;
    height: 0.25rem;
    background-color: var(--primary-color);
    border-radius: 1rem;
}

/* 卡片样式 */
.card {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--hover-shadow);
    transform: translateY(-5px);
}

.card-body {
    padding: 1.5rem;
}

.card-title {
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
}

/* 分类卡片 */
.category-card {
    text-align: center;
    height: 100%;
    cursor: pointer;
}

.category-icon {
    color: var(--primary-color);
    margin-bottom: 1rem;
    transition: var(--transition);
}

.category-card:hover .category-icon {
    transform: scale(1.1);
}

/* 工具卡片 */
.tool-card {
    height: 100%;
    cursor: pointer;
}

.tool-logo {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    object-fit: cover;
    box-shadow: 0 0 0.25rem rgba(0, 0, 0, 0.1);
}

.tool-meta {
    font-size: 0.875rem;
}

.badge {
    font-weight: 500;
    padding: 0.35rem 0.65rem;
    border-radius: 50rem;
}

/* 新闻卡片 */
.news-card {
    height: 100%;
}

.news-card img {
    height: 180px;
    object-fit: cover;
}

.news-card .card-title {
    font-size: 1.1rem;
    line-height: 1.4;
    max-height: 4.2rem;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.news-card .card-text {
    color: var(--gray-color);
    max-height: 4.8rem;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

/* 按钮样式 */
.btn {
    font-weight: 500;
    border-radius: 50rem;
    padding: 0.5rem 1.25rem;
    transition: var(--transition);
}

.btn:focus {
    box-shadow: none;
}

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

.btn-primary:hover {
    background-color: #2a5cd5;
    border-color: #2a5cd5;
}

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

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

/* 返回顶部按钮 */
.back-to-top {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.8;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.back-to-top:hover {
    opacity: 1;
}

/* 页脚样式 */
footer {
    background-color: #1a1d21;
    color: #e0e3e8;
    padding: 3rem 0 2rem;
}

footer h5 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
}

footer .text-muted {
    color: #a0a4aa !important;
}

footer a.text-muted:hover {
    color: #ffffff !important;
    text-decoration: none;
}

footer ul li {
    margin-bottom: 0.75rem;
}

footer hr {
    border-color: rgba(255, 255, 255, 0.1);
    margin: 2rem 0 1.5rem;
}

/* 响应式调整 */
@media (max-width: 767.98px) {
    .navbar-brand {
        font-size: 1.25rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .card-body {
        padding: 1.25rem;
    }
    
    .news-card img {
        height: 150px;
    }
}

/* 暗色模式支持 */
body.dark-mode {
    background-color: #121212;
    color: #e0e3e8;
}

body.dark-mode .top-bar,
body.dark-mode .navbar,
body.dark-mode .card {
    background-color: #1e1e1e !important;
}

body.dark-mode .top-bar {
    border-color: #2d2d2d !important;
}

body.dark-mode .navbar-nav .nav-link,
body.dark-mode .card-title {
    color: #ffffff;
}

body.dark-mode .text-muted {
    color: #a0a4aa !important;
}

body.dark-mode .input-group .form-control,
body.dark-mode .input-group .btn-outline-secondary {
    background-color: #2d2d2d;
    border-color: #444;
    color: #e0e3e8;
}

body.dark-mode .card {
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.2);
}

body.dark-mode .dropdown-menu {
    background-color: #2d2d2d;
    border-color: #444;
}

body.dark-mode .dropdown-item {
    color: #e0e3e8;
}

body.dark-mode .dropdown-item:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* 热门标签云 */
.tags-cloud .badge {
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
    background-color: rgba(55, 114, 255, 0.1);
    color: var(--primary-color);
    border: 1px solid rgba(55, 114, 255, 0.2);
    transition: var(--transition);
}

.tags-cloud .badge:hover {
    background-color: var(--primary-color);
    color: white;
}