/* ========================================
   FusionAI v2 - Component Styles
   组件库 - 导航、卡片、按钮、Hero、页脚
   ======================================== */

/* ============================================
   导航栏
   ============================================ */
.navbar {
    background: var(--bg-primary) !important;
    border-bottom: 1px solid var(--border-color);
}

.navbar-brand {
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--text-primary) !important;
    transition: color var(--transition-fast);
}

.navbar-brand:hover {
    color: var(--color-brand) !important;
}

.navbar-brand i {
    color: var(--color-brand);
}

.navbar .nav-link {
    color: var(--text-secondary) !important;
    font-size: 0.92rem;
    font-weight: 500;
    padding: 0.5rem 0.9rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.navbar .nav-link:hover {
    color: var(--color-brand) !important;
    background: rgba(37, 99, 235, 0.06);
}

/* 活跃导航项 */
.navbar .nav-link.active {
    color: var(--color-brand) !important;
}

/* 搜索框 */
.navbar .form-control {
    background: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-primary);
    font-size: 0.88rem;
}

.navbar .form-control:focus {
    border-color: var(--color-brand);
    box-shadow: var(--shadow-glow);
}

.navbar .btn-outline-light {
    color: var(--text-secondary);
    border-color: var(--border-color);
}

.navbar .btn-outline-light:hover {
    color: var(--color-brand);
    border-color: var(--color-brand);
    background: rgba(37, 99, 235, 0.06);
}

/* 移动端导航 */
.navbar-toggler {
    border-color: var(--border-color);
    color: var(--text-secondary);
}

.navbar-toggler:focus {
    box-shadow: none;
}

.navbar-toggler-icon {
    filter: none;
}

/* ============================================
   卡片 (通用)
   ============================================ */
.card {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    transition: transform var(--transition-normal),
                box-shadow var(--transition-normal);
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.card-header {
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    font-weight: 600;
}

.card-footer {
    background: transparent;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
}

/* 功能卡片 - 带顶边色条 */
.card-feature {
    border-top: 3px solid var(--color-brand);
    border-radius: var(--radius-md);
}

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

/* ============================================
   按钮
   ============================================ */
.btn {
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

/* Primary */
.btn-primary {
    background: var(--color-brand);
    border-color: var(--color-brand);
    color: var(--text-inverse);
}

.btn-primary:hover {
    background: var(--color-brand-hover);
    border-color: var(--color-brand-hover);
    color: var(--text-inverse);
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow);
}

.btn-primary:active {
    background: var(--color-brand-dim) !important;
    border-color: var(--color-brand-dim) !important;
}

/* Outline Primary */
.btn-outline-primary {
    color: var(--color-brand);
    border-color: var(--color-brand);
}

.btn-outline-primary:hover {
    background: rgba(37, 99, 235, 0.08);
    border-color: var(--color-brand-hover);
    color: var(--color-brand-hover);
}

/* Secondary */
.btn-secondary {
    background: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-secondary);
}

.btn-secondary:hover {
    background: var(--bg-elevated);
    border-color: var(--border-light);
    color: var(--text-primary);
}

/* Outline Secondary */
.btn-outline-secondary {
    color: var(--text-secondary);
    border-color: var(--border-color);
}

.btn-outline-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-light);
    color: var(--text-primary);
}

/* Outline Light */
.btn-outline-light {
    color: var(--text-secondary);
    border-color: var(--border-color);
}

.btn-outline-light:hover {
    color: var(--color-brand);
    border-color: var(--color-brand);
    background: rgba(37, 99, 235, 0.06);
}

/* Light button */
.btn-light {
    background: var(--bg-secondary);
    border-color: var(--border-color);
    color: var(--text-primary);
}

.btn-light:hover {
    background: var(--bg-primary);
    border-color: var(--color-brand);
    color: var(--color-brand);
}

/* Large button */
.btn-lg {
    padding: 0.75rem 2rem;
    font-size: 1.05rem;
    border-radius: var(--radius-md);
}

/* Disabled */
.btn:disabled, .btn.disabled {
    opacity: 0.4;
    pointer-events: none;
}

/* Close button */
.btn-close {
    filter: none;
}

/* ============================================
   Hero 区域
   ============================================ */
.hero-section {
    position: relative;
    background: var(--gradient-hero);
    overflow: hidden;
}

/* Hero 背景装饰 - 浅色网格效果 */
.hero-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(37, 99, 235, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(37, 99, 235, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 50% at 50% 50%, black 40%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse 80% 50% at 50% 50%, black 40%, transparent 70%);
}

/* Hero 光晕装饰 */
.hero-section::after {
    content: '';
    position: absolute;
    top: -200px;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero-section .container {
    position: relative;
    z-index: 1;
}

.hero-section h1 {
    font-size: 2.8rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    color: var(--text-primary);
}

.hero-section .lead {
    font-size: 1.15rem;
    color: var(--text-secondary);
}

/* Hero 搜索框 */
.hero-section .form-control {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 1rem;
    padding: 0.8rem 1.2rem;
    border-radius: var(--radius-md);
}

.hero-section .form-control:focus {
    background: var(--bg-primary);
    border-color: var(--color-brand);
    box-shadow: var(--shadow-glow-strong);
}

.hero-section .form-control::placeholder {
    color: var(--text-muted);
}

/* Hero 按钮 */
.hero-section .btn-outline-light {
    color: var(--color-brand);
    border-color: var(--color-brand);
    background: transparent;
}

.hero-section .btn-outline-light:hover {
    background: var(--color-brand);
    color: white;
    border-color: var(--color-brand);
}

/* ============================================
   统计条
   ============================================ */
.stats-bar {
    display: flex;
    gap: 3rem;
    justify-content: center;
    flex-wrap: wrap;
}

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

.stat-number {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--color-brand);
    line-height: 1.1;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.3rem;
}

/* ============================================
   页脚
   ============================================ */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

footer h5, footer h6 {
    color: var(--text-primary);
}

footer a:hover {
    color: var(--color-brand) !important;
}

footer hr {
    border-color: var(--border-light);
}

/* ============================================
   CTA 区域
   ============================================ */
.cta-section {
    background: var(--gradient-cta);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -100px;
    right: -100px;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

/* ============================================
   分类侧边栏
   ============================================ */
.sidebar-category .list-group-item {
    background: var(--bg-secondary);
    border-color: var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.sidebar-category .list-group-item:hover {
    background: var(--bg-tertiary);
    color: var(--color-brand);
}

.sidebar-category .list-group-item.active {
    background: var(--color-brand);
    border-color: var(--color-brand);
    color: var(--text-inverse);
}

/* ============================================
   工具信息表
   ============================================ */
.table-borderless td {
    border: none !important;
    padding: 0.5rem 0.8rem;
    font-size: 0.9rem;
}

.table-borderless td:first-child {
    color: var(--text-muted);
    width: 40%;
}

/* ============================================
   评分色带
   ============================================ */
.score-high {
    color: var(--color-success) !important;
    background: var(--color-success-bg) !important;
}

.score-mid {
    color: var(--color-warning) !important;
    background: var(--color-warning-bg) !important;
}

.score-low {
    color: var(--color-danger) !important;
    background: var(--color-danger-bg) !important;
}

/* ============================================
   空状态
   ============================================ */
.empty-state {
    color: var(--text-muted);
}

.empty-state i {
    opacity: 0.3;
}

/* ============================================
   分页导航
   ============================================ */
.pagination {
    gap: 4px;
}

/* ============================================
   卡片内标题链接
   ============================================ */
.card-title a {
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

.card-title a:hover {
    color: var(--color-brand) !important;
}

/* ============================================
   标签组
   ============================================ */
.tag-list .badge {
    font-size: 0.78rem;
    padding: 0.3em 0.7em;
    border-radius: var(--radius-full);
}

/* ============================================
   文章内容区
   ============================================ */
.article-content {
    color: var(--text-primary);
    font-size: 1.05rem;
    line-height: 1.85;
}

.article-content h2, .article-content h3 {
    color: var(--text-primary);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.article-content p {
    color: var(--text-secondary);
    margin-bottom: 1.2rem;
}

.article-content img {
    border-radius: var(--radius-md);
    max-width: 100%;
}

.article-content pre, .article-content code {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
}

.article-content blockquote {
    border-left: 4px solid var(--color-brand);
    padding-left: 1rem;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    border-radius: 0 var(--radius-sm)