/* ===== 全局变量 ===== */
:root {
    --primary-color: #6C5CE7;
    --primary-light: #a29bfe;
    --primary-dark: #4a3db8;
    --secondary-color: #00B894;
    --secondary-light: #55efc4;
    --accent-color: #FDCB6E;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-dark: #2D3436;
    --text-primary: #2D3436;
    --text-secondary: #636E72;
    --text-light: #B2BEC3;
    --border-color: #DFE6E9;
    --shadow-sm: 0 2px 8px rgba(108, 92, 231, 0.08);
    --shadow-md: 0 4px 20px rgba(108, 92, 231, 0.12);
    --shadow-lg: 0 8px 40px rgba(108, 92, 231, 0.16);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --font-heading: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== 重置 ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--text-primary);
    background: var(--bg-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

img {
    max-width: 100%;
    height: auto;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 36px;
    height: 36px;
    transition: var(--transition);
}

.logo-icon:hover {
    transform: rotate(15deg) scale(1.1);
}

.logo-text {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 22px;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links a {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-color);
    background: rgba(108, 92, 231, 0.08);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 60%;
    height: 2px;
    background: var(--primary-color);
    border-radius: 2px;
    transition: var(--transition);
}

.nav-links a.active::after {
    transform: translateX(-50%) scaleX(1);
}

.nav-admin-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white !important;
    border-radius: var(--radius-sm) !important;
    padding: 8px 20px !important;
}

.nav-admin-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(108, 92, 231, 0.3);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-primary);
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.nav-toggle:hover {
    background: rgba(0, 0, 0, 0.05);
}

/* ===== Hero区 ===== */
.hero {
    background: linear-gradient(135deg, #6C5CE7 0%, #a29bfe 50%, #00B894 100%);
    padding: 120px 20px 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.1) 0%, transparent 50%);
    animation: heroGlow 8s ease-in-out infinite;
}

@keyframes heroGlow {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(5%, -5%); }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

.hero-logo {
    width: 200px;
    height: auto;
    margin-bottom: 24px;
    filter: drop-shadow(0 4px 20px rgba(0,0,0,0.2));
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 48px;
    font-weight: 700;
    color: white;
    margin-bottom: 16px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.2);
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 32px;
    line-height: 1.8;
}

.hero-search {
    max-width: 500px;
    margin: 0 auto;
}

.hero-search form {
    display: flex;
    gap: 0;
    background: white;
    border-radius: 50px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.hero-search input {
    flex: 1;
    padding: 16px 24px;
    border: none;
    outline: none;
    font-size: 16px;
    font-family: var(--font-body);
}

.hero-search button {
    padding: 16px 24px;
    background: var(--primary-color);
    border: none;
    color: white;
    font-size: 18px;
    cursor: pointer;
    transition: var(--transition);
}

.hero-search button:hover {
    background: var(--primary-dark);
}

.hero-wave {
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    z-index: 2;
}

.hero-wave svg {
    width: 100%;
    height: 80px;
}

/* ===== 分类标签 ===== */
.categories-section {
    padding: 24px 0;
    background: var(--bg-primary);
}

.category-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.category-tag {
    padding: 8px 20px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.category-tag:hover,
.category-tag.active {
    color: white;
    background: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(108, 92, 231, 0.3);
}

/* ===== 文章列表 ===== */
.articles-section {
    padding: 40px 0 80px;
    background: var(--bg-secondary);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 32px;
}

.section-header h2 {
    font-family: var(--font-heading);
    font-size: 28px;
    font-weight: 600;
    color: var(--text-primary);
}

.article-count {
    font-size: 14px;
    color: var(--text-light);
    background: white;
    padding: 6px 16px;
    border-radius: 50px;
    border: 1px solid var(--border-color);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.article-card {
    background: white;
    border-radius: var(--radius-md);
    padding: 24px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.article-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

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

.article-card:hover::before {
    transform: scaleX(1);
}

.article-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.article-category {
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
    color: var(--primary-color);
    background: rgba(108, 92, 231, 0.1);
}

.article-date {
    font-size: 12px;
    color: var(--text-light);
}

.article-title {
    font-family: var(--font-heading);
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    line-height: 1.4;
}

.article-title a {
    color: var(--text-primary);
}

.article-title a:hover {
    color: var(--primary-color);
}

.article-excerpt {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.article-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.article-author {
    font-size: 13px;
    color: var(--text-light);
}

.article-author i {
    margin-right: 4px;
}

.read-more {
    font-size: 13px;
    font-weight: 600;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 6px;
}

.read-more i {
    transition: var(--transition);
}

.read-more:hover i {
    transform: translateX(4px);
}

/* ===== 分页 ===== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-top: 40px;
}

.page-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    background: white;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.page-link:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.page-link.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* ===== 空状态 ===== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
}

.empty-state i {
    font-size: 64px;
    color: var(--text-light);
    margin-bottom: 16px;
}

.empty-state h3 {
    font-size: 20px;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.empty-state p {
    color: var(--text-secondary);
}

/* ===== 页脚 ===== */
.footer {
    background: var(--bg-dark);
    color: rgba(255, 255, 255, 0.8);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-logo {
    width: 160px;
    height: auto;
    filter: brightness(0) invert(1);
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.8;
    opacity: 0.8;
}

.footer-links h4,
.footer-info h4 {
    color: white;
    font-family: var(--font-heading);
    font-size: 16px;
    margin-bottom: 16px;
}

.footer-links a {
    display: block;
    font-size: 14px;
    padding: 6px 0;
    opacity: 0.8;
    transition: var(--transition);
}

.footer-links a:hover {
    opacity: 1;
    color: var(--accent-color);
    padding-left: 4px;
}

.footer-info p {
    font-size: 14px;
    line-height: 1.8;
    opacity: 0.8;
    margin-bottom: 8px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    text-align: center;
    font-size: 13px;
    opacity: 0.6;
}

/* ===== 文章详情页 ===== */
.article-detail {
    padding: 100px 0 60px;
    min-height: 80vh;
}

.article-header {
    margin-bottom: 40px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
}

.article-header h1 {
    font-family: var(--font-heading);
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.3;
}

.article-meta {
    display: flex;
    gap: 24px;
    font-size: 14px;
    color: var(--text-secondary);
}

.article-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.article-content {
    font-size: 16px;
    line-height: 1.9;
    color: var(--text-primary);
}

.article-content h2 {
    font-family: var(--font-heading);
    font-size: 24px;
    font-weight: 600;
    margin: 32px 0 16px;
    color: var(--primary-color);
}

.article-content h3 {
    font-family: var(--font-heading);
    font-size: 20px;
    font-weight: 600;
    margin: 24px 0 12px;
}

.article-content p {
    margin-bottom: 16px;
}

.article-content ul, 
.article-content ol {
    margin: 16px 0;
    padding-left: 24px;
}

.article-content li {
    margin-bottom: 8px;
}

.article-content blockquote {
    border-left: 4px solid var(--primary-color);
    padding: 16px 24px;
    margin: 24px 0;
    background: rgba(108, 92, 231, 0.05);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-style: italic;
    color: var(--text-secondary);
}

.article-nav {
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-weight: 500;
    transition: var(--transition);
}

.back-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateX(-4px);
}

/* ===== 后台管理 ===== */
.admin-page {
    background: var(--bg-secondary);
}

.admin-login {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: linear-gradient(135deg, #6C5CE7 0%, #a29bfe 100%);
}

.login-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 40px;
    width: 100%;
    max-width: 400px;
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.login-logo {
    width: 180px;
    height: auto;
    margin-bottom: 24px;
}

.login-card h2 {
    font-family: var(--font-heading);
    font-size: 24px;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.login-form {
    text-align: left;
}

.login-form .form-group {
    margin-bottom: 16px;
}

.login-form label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.login-form input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 15px;
    transition: var(--transition);
}

.login-form input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.1);
}

.login-hint {
    margin-top: 16px;
    font-size: 13px;
    color: var(--text-light);
}

/* 后台仪表盘 */
.admin-dashboard {
    display: flex;
    min-height: 100vh;
}

.admin-nav {
    width: 240px;
    background: var(--bg-dark);
    color: white;
    padding: 20px 0;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    overflow-y: auto;
}

.admin-nav-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 20px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 16px;
}

.admin-nav-header .logo-text {
    color: white;
    font-size: 18px;
}

.admin-nav-links {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 0 12px;
}

.admin-nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    transition: var(--transition);
}

.admin-nav-item:hover,
.admin-nav-item.active {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.admin-nav-item i {
    width: 20px;
    text-align: center;
}

.logout-btn {
    margin-top: auto;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
}

.admin-main {
    flex: 1;
    margin-left: 240px;
    padding: 30px;
}

.admin-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 30px;
}

.admin-header h1 {
    font-family: var(--font-heading);
    font-size: 24px;
}

/* 统计卡片 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    border-radius: var(--radius-md);
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.stat-card i {
    font-size: 36px;
    color: var(--primary-color);
}

.stat-info h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-info p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 表格 */
.table-container {
    background: white;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    background: var(--bg-secondary);
    padding: 12px 16px;
    font-size: 13px;
    font-weight: 600;
    text-align: left;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

.data-table td {
    padding: 12px 16px;
    font-size: 14px;
    border-bottom: 1px solid var(--border-color);
}

.data-table tr:last-child td {
    border-bottom: none;
}

.data-table tr:hover td {
    background: rgba(108, 92, 231, 0.02);
}

.data-table code {
    background: var(--bg-secondary);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
}

/* 后台表单 */
.admin-form {
    background: white;
    border-radius: var(--radius-md);
    padding: 30px;
    border: 1px solid var(--border-color);
    max-width: 800px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: var(--font-body);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.1);
}

.form-group input[type="color"] {
    height: 40px;
    padding: 4px;
    cursor: pointer;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-hint {
    font-size: 12px;
    color: var(--text-light);
    margin-top: 4px;
}

/* 按钮 */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(108, 92, 231, 0.3);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: white;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

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

.btn-danger {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: #e74c3c;
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.btn-danger:hover {
    background: #c0392b;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* 提示 */
.alert {
    padding: 12px 20px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    font-size: 14px;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Tab内容 */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* AI结果预览 */
.ai-result {
    background: white;
    border-radius: var(--radius-md);
    padding: 24px;
    margin-bottom: 20px;
    border: 1px solid var(--primary-light);
}

.ai-content-preview {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 16px;
    margin: 16px 0;
    max-height: 400px;
    overflow-y: auto;
    background: var(--bg-secondary);
}

.action-buttons {
    display: flex;
    gap: 8px;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
    }

    .nav-links.open {
        display: flex;
    }

    .nav-toggle {
        display: block;
    }

    .hero-title {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .article-header h1 {
        font-size: 24px;
    }

    .admin-dashboard {
        flex-direction: column;
    }

    .admin-nav {
        width: 100%;
        position: relative;
        padding: 12px 0;
    }

    .admin-nav-links {
        flex-direction: row;
        flex-wrap: wrap;
        padding: 0 12px;
    }

    .admin-nav-item {
        padding: 8px 12px;
        font-size: 13px;
    }

    .admin-main {
        margin-left: 0;
        padding: 20px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 480px) {
    .hero {
        padding: 100px 16px 60px;
    }

    .hero-title {
        font-size: 26px;
    }

    .hero-search input {
        padding: 12px 16px;
        font-size: 14px;
    }

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

    .article-meta {
        flex-direction: column;
        gap: 8px;
    }
}