/**
 * Tags Enhanced CSS v3.0 - 世界级标签云设计
 * 彻底重构版 - 现代化、优雅、高性能
 * Author: Claude (SuperClaude Framework)
 * Date: 2025-10-16
 */

/* ==================== CSS变量系统 ==================== */
:root {
    /* 主色调 - 深紫蓝渐变 */
    --primary: #667eea;
    --primary-dark: #764ba2;
    --primary-light: #eef2ff;
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

    /* 中性色 - 现代灰度 */
    --bg-primary: #fafbfc;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-tertiary: #718096;
    --border-color: #e2e8f0;
    --border-hover: #cbd5e0;

    /* 功能色 */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;

    /* 间距系统 (8px基础单位) */
    --space-1: 8px;
    --space-2: 16px;
    --space-3: 24px;
    --space-4: 32px;
    --space-5: 40px;
    --space-6: 48px;
    --space-8: 64px;

    /* 圆角系统 */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    --radius-full: 9999px;

    /* 阴影系统 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 10px 24px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
    --shadow-primary: 0 8px 24px rgba(102, 126, 234, 0.35);
    --shadow-primary-lg: 0 12px 32px rgba(102, 126, 234, 0.4);

    /* 过渡效果 */
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    --transition-fast: all 0.15s ease;

    /* 字体 */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;
}

/* ==================== 全局优化 ==================== */
* {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
}

/* ==================== 页面头部区域 ==================== */
.tags-header {
    text-align: center;
    padding: var(--space-5) 0;
    background: linear-gradient(135deg, #f8f9ff 0%, #ffffff 100%);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-4);
    box-shadow: var(--shadow);
}

.tags-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-2);
    letter-spacing: -0.02em;
}

.tags-description {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
    max-width: 600px;
    margin: 0 auto;
}

/* ==================== 统计卡片 ==================== */
.tags-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.stat-box {
    background: var(--primary-gradient);
    color: white;
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-primary);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.stat-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(255,255,255,0.1) 0%, transparent 100%);
    opacity: 0;
    transition: opacity 0.3s;
}

.stat-box:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-primary-lg);
}

.stat-box:hover::before {
    opacity: 1;
}

.stat-box .number {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--space-1);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    letter-spacing: -0.03em;
}

.stat-box .label {
    font-size: 0.875rem;
    opacity: 0.95;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

/* ==================== 分类导航区域 ==================== */
.category-nav-section {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-4);
    margin-bottom: var(--space-4);
    box-shadow: var(--shadow);
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-3);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.section-title::before {
    content: '';
    width: 4px;
    height: 28px;
    background: var(--primary-gradient);
    border-radius: var(--radius-sm);
}

.category-nav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    padding: var(--space-2) 0;
}

.category-pill {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: 12px 24px;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9375rem;
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.category-pill::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity 0.3s;
    z-index: 0;
}

.category-pill > * {
    position: relative;
    z-index: 1;
}

.category-pill:hover:not(.active) {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.category-pill.active {
    background: var(--primary-gradient);
    color: white;
    border-color: transparent;
    box-shadow: var(--shadow-primary);
    transform: scale(1.05);
}

.category-pill.active::before {
    opacity: 1;
}

.category-icon {
    font-size: 1.125rem;
}

.category-count {
    padding: 3px 8px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    backdrop-filter: blur(4px);
}

.category-pill.active .category-count {
    background: rgba(255, 255, 255, 0.3);
}

/* ==================== 标签云区域 ==================== */
.tag-cloud-section {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-5);
    margin-bottom: var(--space-4);
    box-shadow: var(--shadow);
}

/* 搜索框 */
.tags-search {
    margin-bottom: var(--space-4);
    position: relative;
}

.tags-search input {
    width: 100%;
    padding: 18px 50px 18px 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-family: var(--font-sans);
    background: white;
    transition: var(--transition-base);
    box-shadow: var(--shadow-sm);
}

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

.tags-search input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1), var(--shadow-md);
    transform: translateY(-2px);
}

.search-icon {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.25rem;
    color: var(--text-tertiary);
    pointer-events: none;
}

.search-results-info {
    margin-top: var(--space-2);
    padding: var(--space-2);
    background: #fef3c7;
    border-radius: var(--radius-md);
    color: #92400e;
    font-size: 0.875rem;
    text-align: center;
}

/* 标签云主体 */
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    justify-content: center;
    min-height: 200px;
    padding: var(--space-3);
}

.tag-cloud-item {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--tag-padding, 10px 20px);
    background: linear-gradient(135deg, #f8f9ff 0%, #f0f4ff 100%);
    border: 2px solid transparent;
    border-radius: 20px;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: var(--tag-size, 0.9375rem);
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-bounce);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    will-change: transform;
}

/* 悬浮光效 */
.tag-cloud-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transition: left 0.6s;
}

.tag-cloud-item:hover::before {
    left: 100%;
}

.tag-cloud-item:hover {
    background: var(--primary-gradient);
    color: white;
    border-color: var(--primary);
    transform: translateY(-4px) scale(1.08);
    box-shadow: var(--shadow-primary);
    z-index: 10;
}

.tag-icon {
    font-size: 1.125rem;
    opacity: 0.8;
}

.tag-name {
    font-weight: 500;
}

.tag-count {
    padding: 2px 8px;
    background: rgba(102, 126, 234, 0.12);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary);
}

.tag-cloud-item:hover .tag-count {
    background: rgba(255, 255, 255, 0.25);
    color: white;
}

/* 5级标签尺寸系统 */
.tag-cloud-item.size-1,
.tag-cloud-item[data-size="1"] {
    --tag-size: 0.8125rem;
    --tag-padding: 8px 16px;
    font-weight: 400;
}

.tag-cloud-item.size-2,
.tag-cloud-item[data-size="2"] {
    --tag-size: 0.875rem;
    --tag-padding: 9px 18px;
    font-weight: 500;
}

.tag-cloud-item.size-3,
.tag-cloud-item[data-size="3"] {
    --tag-size: 0.9375rem;
    --tag-padding: 10px 20px;
    font-weight: 500;
}

.tag-cloud-item.size-4,
.tag-cloud-item[data-size="4"] {
    --tag-size: 1rem;
    --tag-padding: 12px 22px;
    font-weight: 600;
}

.tag-cloud-item.size-5,
.tag-cloud-item[data-size="5"] {
    --tag-size: 1.125rem;
    --tag-padding: 14px 26px;
    font-weight: 700;
}

/* ==================== 标签列表区域 ==================== */
.tags-list-section {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-5);
    margin-bottom: var(--space-4);
    box-shadow: var(--shadow);
}

.tags-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-3);
}

.tag-card {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-3);
    transition: var(--transition-base);
    text-decoration: none;
    display: block;
    box-shadow: var(--shadow-sm);
}

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

.tag-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-2);
}

.tag-card-title {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.tag-card-icon {
    font-size: 1.5rem;
}

.tag-card-count {
    background: var(--primary-gradient);
    color: white;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.tag-card-meta {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

.tag-card-category {
    font-weight: 500;
}

.tag-card-domains {
    opacity: 0.7;
}

/* ==================== 标签预览浮层 ==================== */
.tag-preview {
    position: absolute;
    min-width: 320px;
    max-width: 400px;
    background: white;
    border: 1px solid rgba(102, 126, 234, 0.15);
    border-radius: var(--radius-xl);
    padding: var(--space-3);
    box-shadow: var(--shadow-xl), 0 0 0 1px rgba(102, 126, 234, 0.05);
    opacity: 0;
    transform: translateY(-10px) scale(0.95);
    transition: var(--transition-bounce);
    pointer-events: none;
    z-index: 100;
}

.tag-preview.active {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: all;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-2);
    padding-bottom: var(--space-2);
    border-bottom: 1px solid var(--border-color);
}

.preview-header h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.preview-count {
    padding: 4px 12px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
}

.preview-related {
    margin-top: var(--space-2);
}

.preview-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-1);
}

.preview-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-1);
}

.preview-tag {
    padding: 4px 10px;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

/* ==================== 加载骨架屏 ==================== */
.loading-skeleton {
    padding: var(--space-4);
    text-align: center;
}

.skeleton-tag {
    display: inline-block;
    width: var(--skeleton-width, 120px);
    height: 42px;
    background: linear-gradient(90deg, #f3f4f6 0%, #f3f4f6 40%, #e5e7eb 50%, #f3f4f6 60%, #f3f4f6 100%);
    background-size: 200% 100%;
    animation: shimmer 1.8s ease-in-out infinite;
    border-radius: 24px;
    margin: 6px;
}

.skeleton-tag:nth-child(1) { --skeleton-width: 140px; }
.skeleton-tag:nth-child(2) { --skeleton-width: 100px; }
.skeleton-tag:nth-child(3) { --skeleton-width: 160px; }
.skeleton-tag:nth-child(4) { --skeleton-width: 120px; }
.skeleton-tag:nth-child(5) { --skeleton-width: 180px; }
.skeleton-tag:nth-child(6) { --skeleton-width: 110px; }

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

/* ==================== 空状态 ==================== */
.empty-state {
    text-align: center;
    padding: var(--space-8) var(--space-4);
    color: var(--text-tertiary);
    font-size: 1rem;
}

.error-state {
    text-align: center;
    padding: var(--space-6);
}

.error-icon {
    font-size: 3rem;
    margin-bottom: var(--space-2);
}

.error-message {
    color: var(--error);
    font-size: 1rem;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    :root {
        font-size: 15px;
    }

    .category-nav {
        overflow-x: auto;
        overflow-y: hidden;
        -webkit-overflow-scrolling: touch;
        scroll-snap-type: x proximity;
        flex-wrap: nowrap;
        padding: var(--space-2);
    }

    .category-pill {
        flex-shrink: 0;
        scroll-snap-align: start;
    }

    .tag-preview {
        min-width: 280px;
    }
}

@media (max-width: 768px) {
    :root {
        font-size: 14px;
    }

    .tags-header h1 {
        font-size: 2rem;
    }

    .tags-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-2);
    }

    .stat-box {
        padding: var(--space-3);
    }

    .stat-box .number {
        font-size: 2rem;
    }

    .tag-cloud-section,
    .tags-list-section,
    .category-nav-section {
        padding: var(--space-3);
    }

    .section-title {
        font-size: 1.25rem;
    }

    .tag-cloud {
        gap: var(--space-1);
        padding: var(--space-2);
    }

    /* 移动端触摸目标优化 */
    .tag-cloud-item {
        min-height: 44px;
        padding: 12px 20px !important;
    }

    .tags-grid {
        grid-template-columns: 1fr;
        gap: var(--space-2);
    }

    /* 移动端搜索框固定 */
    .tags-search {
        position: sticky;
        top: 0;
        z-index: 50;
        background: white;
        padding: var(--space-2);
        margin: calc(-1 * var(--space-3)) calc(-1 * var(--space-3)) var(--space-3);
        box-shadow: var(--shadow);
    }

    /* 移动端预览 - 底部抽屉 */
    .tag-preview {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        min-width: 100%;
        max-width: 100%;
        border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
        transform: translateY(100%);
    }

    .tag-preview.active {
        transform: translateY(0);
    }

    /* 添加拖动手柄 */
    .tag-preview::before {
        content: '';
        position: absolute;
        top: 12px;
        left: 50%;
        transform: translateX(-50%);
        width: 40px;
        height: 4px;
        background: var(--border-color);
        border-radius: var(--radius-sm);
    }
}

@media (max-width: 480px) {
    .tags-stats {
        grid-template-columns: 1fr;
    }

    .tags-header h1 {
        font-size: 1.75rem;
    }

    .stat-box .number {
        font-size: 1.75rem;
    }

    .tag-cloud-item {
        font-size: 0.875rem !important;
        padding: 10px 16px !important;
    }

    .tag-card {
        padding: var(--space-2);
    }

    .tag-card-title {
        font-size: 1rem;
    }
}

/* ==================== 性能优化 ==================== */
.tag-cloud-item,
.category-pill,
.stat-box,
.tag-card {
    will-change: transform;
    transform: translateZ(0);
}

.tag-cloud,
.category-nav,
.tags-grid {
    contain: layout style paint;
}

/* ==================== 打印样式 ==================== */
@media print {
    .tags-search,
    .loading-skeleton,
    .tag-preview {
        display: none;
    }

    .tag-cloud-item,
    .category-pill {
        break-inside: avoid;
    }
}