/* ========================================
   云端登录系统 - 现代化UI样式
   ======================================== */

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

:root {
    /* 主色调 */
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --secondary: #ec4899;
    --secondary-light: #f472b6;
    
    /* 功能色 */
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    
    /* 中性色 */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
    --gradient-secondary: linear-gradient(135deg, #3b82f6 0%, #6366f1 100%);
    --gradient-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --gradient-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    
    /* 过渡 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--gray-50);
    margin: 0;
    min-height: 100vh;
    color: var(--gray-800);
    line-height: 1.6;
}

body.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-bg);
    min-height: 100vh;
    position: relative;
    overflow: hidden;
}

body.login-page::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: rotate 30s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

body.admin-page {
    display: block;
    background: var(--gray-100);
}

/* ========================================
   容器样式
   ======================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========================================
   头部样式
   ======================================== */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
}

.header-left .logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.header-left .logo-icon {
    font-size: 28px;
    filter: drop-shadow(0 2px 4px rgba(99, 102, 241, 0.3));
}

.header-left .logo-text {
    font-size: 20px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 24px;
}

.header-right .nav-link {
    color: var(--gray-600);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    padding: 8px 0;
}

.header-right .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition);
}

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

.header-right .nav-link:hover::after {
    width: 100%;
}

/* ========================================
   英雄区域样式
   ======================================== */
.hero {
    background: var(--gradient-bg);
    color: white;
    padding: 100px 0;
    position: relative;
    overflow: hidden;
}

.hero::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");
    opacity: 0.5;
}

.hero-content {
    display: flex;
    align-items: center;
    gap: 60px;
    position: relative;
    z-index: 1;
}

.hero-text {
    flex: 1;
    max-width: 550px;
}

.hero-text h1 {
    font-size: 52px;
    font-weight: 800;
    margin-bottom: 24px;
    line-height: 1.2;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.hero-text p {
    font-size: 18px;
    margin-bottom: 36px;
    line-height: 1.7;
    opacity: 0.95;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-buttons .btn-primary {
    background: white;
    color: var(--primary);
    padding: 16px 32px;
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: var(--shadow-lg);
}

.hero-buttons .btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.illustration {
    position: relative;
    width: 100%;
    max-width: 400px;
    height: 350px;
}

.computer {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.screen {
    background: white;
    border-radius: var(--radius-lg);
    padding: 24px;
    display: inline-block;
    box-shadow: var(--shadow-xl);
}

.screen-content {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.icon-box {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    transition: var(--transition);
}

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

.icon-box.blue {
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
}

.icon-box.green {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
}

.icon-box.red {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
}

.icon-box.yellow {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
}

.stand {
    width: 50px;
    height: 70px;
    background: linear-gradient(180deg, #e5e7eb 0%, #d1d5db 100%);
    margin: 12px auto 0;
    border-bottom-left-radius: var(--radius-lg);
    border-bottom-right-radius: var(--radius-lg);
}

.person {
    position: absolute;
    top: 50%;
    left: 25%;
    transform: translate(-50%, -50%);
    font-size: 56px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(-50%, -50%); }
    50% { transform: translate(-50%, -60%); }
}

/* ========================================
   功能区域样式
   ======================================== */
.features {
    padding: 100px 0;
    background: white;
}

.features h2 {
    text-align: center;
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--gray-800);
}

.section-header p {
    text-align: center;
    font-size: 18px;
    color: var(--gray-500);
    margin-bottom: 60px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.feature-card {
    background: white;
    padding: 40px 32px;
    border-radius: var(--radius-xl);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--gray-100);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

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

.feature-icon {
    font-size: 56px;
    margin-bottom: 24px;
    display: inline-block;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--gray-800);
}

.feature-card p {
    font-size: 15px;
    color: var(--gray-500);
    line-height: 1.7;
}

/* ========================================
   页脚样式
   ======================================== */
.footer {
    background: var(--gray-900);
    color: white;
    padding: 80px 0 40px;
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gradient-primary);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 48px;
    margin-bottom: 48px;
}

.footer-info .footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.footer-info .logo-icon {
    font-size: 28px;
}

.footer-info .logo-text {
    font-size: 20px;
    font-weight: 700;
}

.footer-info p {
    font-size: 15px;
    line-height: 1.7;
    opacity: 0.7;
    margin-bottom: 24px;
}

.footer-links h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: white;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
    padding-left: 4px;
}

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 14px;
    opacity: 0.6;
}

/* ========================================
   用户登录页面样式
   ======================================== */
.user-login-container {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
    z-index: 1;
}

.user-login-form {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: 48px 40px;
    width: 100%;
    max-width: 420px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.login-header {
    text-align: center;
    margin-bottom: 36px;
}

.login-header h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--gray-800);
}

.login-header p {
    font-size: 15px;
    color: var(--gray-500);
    margin: 0;
}

.user-login-form .form-group {
    margin-bottom: 24px;
    text-align: left;
}

.user-login-form label {
    display: block;
    margin-bottom: 8px;
    color: var(--gray-700);
    font-size: 14px;
    font-weight: 500;
}

.user-login-form input[type="text"],
.user-login-form input[type="password"],
.user-login-form input[type="email"],
.user-login-form select {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: 15px;
    transition: var(--transition);
    background: white;
}

.user-login-form input[type="text"]:focus,
.user-login-form input[type="password"]:focus,
.user-login-form input[type="email"]:focus,
.user-login-form select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.user-login-form button {
    width: 100%;
    padding: 16px 24px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 8px;
    box-shadow: var(--shadow-md);
}

.user-login-form button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.login-footer {
    text-align: center;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--gray-100);
}

.login-footer p {
    font-size: 14px;
    color: var(--gray-500);
}

.login-footer a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.login-footer a:hover {
    text-decoration: underline;
}

/* ========================================
   后台管理界面样式
   ======================================== */
.admin-container {
    display: flex;
    width: 100vw;
    height: 100vh;
    background: var(--gray-100);
    overflow: hidden;
}

.sidebar {
    width: 260px;
    background: white;
    display: flex;
    flex-direction: column;
    height: 100%;
    box-shadow: var(--shadow-lg);
    position: relative;
    z-index: 10;
}

.sidebar-header {
    padding: 28px 24px;
    text-align: center;
    border-bottom: 1px solid var(--gray-100);
    background: var(--gradient-primary);
    color: white;
}

.sidebar-header h2 {
    margin: 0;
    font-size: 20px;
    font-weight: 700;
}

.sidebar-subtitle {
    margin-top: 6px;
    font-size: 13px;
    opacity: 0.9;
}

.sidebar-nav {
    flex: 1;
    padding: 20px 12px;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 14px 18px;
    color: var(--gray-600);
    text-decoration: none;
    transition: var(--transition);
    border-radius: var(--radius-md);
    margin-bottom: 4px;
    font-size: 15px;
}

.nav-item:hover {
    background: var(--gray-50);
    color: var(--primary);
}

.nav-item.active {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    color: var(--primary);
    font-weight: 600;
}

.nav-icon {
    margin-right: 14px;
    font-size: 20px;
}

.nav-text {
    font-size: 15px;
    font-weight: 500;
}

.sidebar-footer {
    border-top: 1px solid var(--gray-100);
    padding: 16px 12px;
}

.logout-btn {
    width: 100%;
    text-align: left;
    background: none;
    padding: 14px 18px;
    border: none;
    color: var(--gray-600);
    cursor: pointer;
    display: flex;
    align-items: center;
    transition: var(--transition);
    border-radius: var(--radius-md);
    font-size: 15px;
}

.logout-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.logout-icon {
    width: 20px;
    height: 20px;
    margin-right: 14px;
    flex-shrink: 0;
}

.main-content {
    flex: 1;
    padding: 32px 40px;
    overflow-y: auto;
    background: var(--gray-100);
}

.content-header {
    margin-bottom: 32px;
    background: white;
    padding: 28px 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.content-header h1 {
    margin: 0;
    color: var(--gray-800);
    font-size: 26px;
    font-weight: 700;
}

.content-subtitle {
    margin-top: 8px;
    color: var(--gray-500);
    font-size: 15px;
}

/* ========================================
   消息提示样式
   ======================================== */
.message {
    padding: 16px 20px;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
    font-size: 14px;
    font-weight: 500;
    box-shadow: var(--shadow);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.success {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
    color: #065f46;
    border: 1px solid #6ee7b7;
}

.message.error {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    color: #991b1b;
    border: 1px solid #fca5a5;
}

.message.warning {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    color: #92400e;
    border: 1px solid #fcd34d;
}

/* ========================================
   卡片样式
   ======================================== */
.card {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    margin-bottom: 24px;
    overflow: hidden;
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    padding: 24px 28px;
    border-bottom: 1px solid var(--gray-100);
    background: linear-gradient(135deg, var(--gray-50) 0%, white 100%);
}

.card-header h2 {
    margin: 0;
    color: var(--gray-800);
    font-size: 18px;
    font-weight: 600;
}

.card-header p {
    margin: 6px 0 0 0;
    color: var(--gray-500);
    font-size: 14px;
}

.card-body {
    padding: 28px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--gray-700);
    font-size: 14px;
    font-weight: 500;
}

input[type="text"],
input[type="password"],
input[type="email"],
input[type="datetime-local"],
select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: 14px;
    transition: var(--transition);
    background: white;
}

input[type="text"]:focus,
input[type="password"]:focus,
input[type="email"]:focus,
input[type="datetime-local"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

/* ========================================
   按钮样式
   ======================================== */
.btn-primary {
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: white;
    border: none;
    border-radius: var(--radius);
    padding: 10px 18px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--gray-500);
    color: white;
    border: none;
    border-radius: var(--radius);
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:hover {
    background: var(--gray-600);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
    min-width: 70px;
    text-align: center;
}

/* ========================================
   表格样式
   ======================================== */
.data-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: var(--radius);
    overflow: hidden;
}

.data-table th,
.data-table td {
    padding: 16px 20px;
    text-align: left;
    border-bottom: 1px solid var(--gray-100);
}

.data-table th {
    background: var(--gray-50);
    font-weight: 600;
    color: var(--gray-700);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table td {
    font-size: 14px;
    color: var(--gray-600);
}

.data-table tr {
    transition: var(--transition-fast);
}

.data-table tbody tr:hover {
    background: var(--gray-50);
}

/* ========================================
   状态徽章
   ======================================== */
.status-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
}

.status-success {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
    color: #065f46;
}

.status-danger {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    color: #991b1b;
}

/* ========================================
   空状态
   ======================================== */
.empty-state {
    text-align: center;
    padding: 48px 20px;
}

.empty-icon {
    font-size: 56px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-text {
    color: var(--gray-400);
    font-size: 15px;
}

/* ========================================
   滑动开关样式
   ======================================== */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 52px;
    height: 28px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gray-300);
    transition: var(--transition);
    border-radius: var(--radius-full);
}

.slider:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
    background: white;
    transition: var(--transition);
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
}

input:checked + .slider {
    background: var(--gradient-primary);
}

input:checked + .slider:before {
    transform: translateX(24px);
}

.toggle-switch.small {
    width: 40px;
    height: 22px;
}

.toggle-switch.small .slider {
    border-radius: var(--radius-full);
}

.toggle-switch.small .slider:before {
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
}

.toggle-switch.small input:checked + .slider:before {
    transform: translateX(18px);
}

/* ========================================
   模态框样式
   ======================================== */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.modal-content {
    background: white;
    margin: 10% auto;
    padding: 0;
    width: 90%;
    max-width: 480px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        transform: translateY(-30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    padding: 24px 28px;
    border-bottom: 1px solid var(--gray-100);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
    color: var(--gray-800);
    font-size: 18px;
    font-weight: 600;
}

.modal-body {
    padding: 28px;
}

.modal-footer {
    border-top: 1px solid var(--gray-100);
    padding: 20px 28px;
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* ========================================
   隐藏类
   ======================================== */
.hidden {
    display: none !important;
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 768px) {
    .hero-content {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-text h1 {
        font-size: 36px;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .admin-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
    }
    
    .sidebar-nav {
        display: flex;
        overflow-x: auto;
        padding: 12px;
    }
    
    .nav-item {
        white-space: nowrap;
    }
    
    .main-content {
        padding: 20px;
    }
    
    .modal-content {
        margin: 20% auto;
    }
}