/* 现代化主题样式 - 年轻化设计 */
:root {
    --primary: #667eea;
    --primary-light: #764ba2;
    --secondary: #f093fb;
    --accent: #f5576c;
    --success: #00b894;
    --warning: #fdcb6e;
    --danger: #e17055;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --text-dark: #2d3436;
    --text-muted: #636e72;
    --border-color: #dfe6e9;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.12);
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-4: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    --gradient-5: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    --gradient-success: linear-gradient(135deg, #00b894 0%, #00cec9 100%);
    --gradient-warning: linear-gradient(135deg, #fdcb6e 0%, #e17055 100%);
    --gradient-danger: linear-gradient(135deg, #ff6b6b 0%, #ee5a6f 100%);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
    min-height: 100vh;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    padding: 12px 0;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo-icon {
    width: 42px;
    height: 42px;
    background: var(--gradient-1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.logo-text {
    font-size: 22px;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-link {
    padding: 10px 18px;
    border-radius: 20px;
    text-decoration: none;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
}

.nav-link:hover, .nav-link.active {
    background: var(--gradient-1);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.nav-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

/* 按钮 */
.btn {
    padding: 12px 28px;
    border-radius: 25px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background: var(--gradient-1);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: var(--gradient-2);
    color: white;
    box-shadow: 0 4px 15px rgba(240, 147, 251, 0.3);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(240, 147, 251, 0.4);
}

.btn-success {
    background: var(--gradient-success);
    color: white;
    box-shadow: 0 4px 15px rgba(0, 184, 148, 0.3);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 184, 148, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-outline:hover {
    background: var(--gradient-1);
    color: white;
    border-color: transparent;
}

.btn-ghost {
    background: rgba(255,255,255,0.1);
    color: white;
    border: 1px solid rgba(255,255,255,0.3);
}

.btn-ghost:hover {
    background: rgba(255,255,255,0.2);
}

.btn-sm {
    padding: 8px 18px;
    font-size: 13px;
}

.btn-lg {
    padding: 16px 36px;
    font-size: 16px;
}

/* 主容器 */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 30px;
}

/* 页面头部 */
.page-header {
    background: var(--gradient-1);
    padding: 100px 30px 60px;
    margin-bottom: 40px;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.page-header-content {
    position: relative;
    z-index: 10;
    max-width: 1400px;
    margin: 0 auto;
    color: white;
}

.page-title {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 12px;
}

.page-desc {
    font-size: 18px;
    opacity: 0.9;
}

/* 卡片 */
.card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.4s;
    border: 1px solid rgba(0,0,0,0.03);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    padding: 24px 24px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-title {
    font-size: 20px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
}

.card-title i {
    width: 36px;
    height: 36px;
    background: var(--gradient-1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 16px;
}

.card-body {
    padding: 20px 24px 24px;
}

.card-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* 内容项 */
.content-item {
    padding: 16px;
    background: var(--bg-light);
    border-radius: 16px;
    margin-bottom: 12px;
    transition: all 0.3s;
    cursor: pointer;
}

.content-item:last-child {
    margin-bottom: 0;
}

.content-item:hover {
    background: #e8f4f8;
    transform: translateX(5px);
}

.content-item-header {
    display: flex;
    gap: 12px;
    margin-bottom: 10px;
}

.content-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--gradient-1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 16px;
    flex-shrink: 0;
    overflow: hidden;
}

.content-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.content-meta {
    flex: 1;
}

.content-name {
    font-weight: 600;
    font-size: 15px;
    color: var(--text-dark);
}

.content-time {
    font-size: 12px;
    color: var(--text-muted);
}

.content-text {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
}

/* 标签 */
.tag {
    display: inline-block;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.tag-primary {
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary);
}

.tag-success {
    background: rgba(0, 184, 148, 0.1);
    color: var(--success);
}

.tag-warning {
    background: rgba(253, 203, 110, 0.1);
    color: #e67e22;
}

.tag-danger {
    background: rgba(225, 112, 85, 0.1);
    color: var(--danger);
}

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

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.form-control {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 15px;
    transition: all 0.3s;
    background: white;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.form-control::placeholder {
    color: #b2bec3;
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
}

/* 网格布局 */
.grid {
    display: grid;
    gap: 24px;
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* 页脚 */
.footer {
    background: #1a1a2e;
    color: rgba(255,255,255,0.7);
    padding: 60px 30px 30px;
    margin-top: 80px;
}

.footer-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: 60px;
}

.footer-brand {
    font-size: 28px;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
}

.footer-desc {
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 24px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.footer-social a {
    width: 44px;
    height: 44px;
    background: rgba(255,255,255,0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
    transition: all 0.3s;
}

.footer-social a:hover {
    background: var(--primary);
    transform: translateY(-5px);
}

.footer-title {
    font-size: 16px;
    font-weight: 700;
    color: white;
    margin-bottom: 20px;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: rgba(255,255,255,0.6);
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s;
}

.footer-links a:hover {
    color: var(--primary);
    padding-left: 8px;
}

.footer-bottom {
    max-width: 1400px;
    margin: 50px auto 0;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
    font-size: 14px;
    color: rgba(255,255,255,0.4);
}

/* 工具类 */
.text-center {
    text-align: center;
}

.mt-4 {
    margin-top: 24px;
}

.mb-4 {
    margin-bottom: 24px;
}

.p-4 {
    padding: 24px;
}

.d-flex {
    display: flex;
}

.justify-between {
    justify-content: space-between;
}

.align-center {
    align-items: center;
}

.gap-2 {
    gap: 12px;
}

/* 响应式 */
@media (max-width: 1200px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }
    .page-title {
        font-size: 32px;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}