/* ============================================
   基础样式重置
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 主色调 - 蓝色系 */
    --primary-blue: #2563eb;
    --primary-blue-dark: #1e40af;
    --primary-blue-light: #3b82f6;
    --primary-blue-lighter: #60a5fa;
    --primary-blue-lightest: #dbeafe;
    
    /* 辅助色 - 白色系 */
    --white: #ffffff;
    --white-off: #f8fafc;
    --white-gray: #f1f5f9;
    
    /* 文字颜色 */
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-light: #64748b;
    --text-white: #ffffff;
    
    /* 状态颜色 */
    --success: #10b981;
    --success-light: #d1fae5;
    --error: #ef4444;
    --error-light: #fee2e2;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --info: #3b82f6;
    --info-light: #dbeafe;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    
    /* 间距 */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    background: #ffffff;
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
    padding: 0;
    margin: 0;
    position: relative;
}

/* ============================================
   容器布局
   ============================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-lg);
    position: relative;
    z-index: 1;
}

/* ============================================
   头部样式
   ============================================ */
header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

header .neumorphic-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-2xl);
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-dark) 100%);
    color: var(--text-white);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-white);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

header p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
    margin: 0;
}

/* ============================================
   标题样式
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
    border-bottom: 3px solid var(--primary-blue-light);
    padding-bottom: var(--spacing-sm);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

h3 {
    font-size: 1.5rem;
    color: var(--primary-blue-dark);
}

/* ============================================
   卡片样式
   ============================================ */
.neumorphic-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(37, 99, 235, 0.1);
}

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

/* ============================================
   按钮样式
   ============================================ */
.neumorphic-btn {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
    border: none;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    color: var(--text-white);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-lg);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    display: inline-block;
    position: relative;
    overflow: hidden;
}

.neumorphic-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.neumorphic-btn:hover {
    background: linear-gradient(135deg, var(--primary-blue-dark) 0%, var(--primary-blue) 100%);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.neumorphic-btn:hover::before {
    width: 300px;
    height: 300px;
}

.neumorphic-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.neumorphic-btn.active {
    background: var(--primary-blue-dark);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* ============================================
   输入框样式
   ============================================ */
.neumorphic-input {
    background: var(--white-off);
    border: 2px solid var(--white-gray);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    padding: var(--spacing-sm) var(--spacing-md);
    width: 100%;
    margin-bottom: var(--spacing-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    outline: none;
}

.neumorphic-input:focus {
    border-color: var(--primary-blue);
    background: var(--white);
    box-shadow: 0 0 0 3px var(--primary-blue-lightest);
}

.neumorphic-input::placeholder {
    color: var(--text-light);
}

.neumorphic-input.error {
    border-color: var(--error);
    box-shadow: 0 0 0 3px var(--error-light);
}

/* ============================================
   表单样式
   ============================================ */
.form-group {
    margin-bottom: var(--spacing-lg);
}

label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

small {
    display: block;
    margin-top: var(--spacing-xs);
    color: var(--text-light);
    font-size: 0.875rem;
}

.form-actions {
    text-align: right;
    margin-top: var(--spacing-xl);
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    flex-wrap: wrap;
}

.form-actions .neumorphic-btn {
    margin: 0;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
}

.btn-secondary {
    background: var(--white);
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

.btn-secondary:hover {
    background: var(--primary-blue-lightest);
    color: var(--primary-blue-dark);
}

/* ============================================
   消息提示样式
   ============================================ */
.message {
    position: relative;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    border-radius: var(--radius-md);
    border-left: 4px solid;
    animation: slideIn 0.3s ease-out;
}

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

.message.info {
    background: var(--info-light);
    border-left-color: var(--info);
    color: var(--primary-blue-dark);
}

.message.success {
    background: var(--success-light);
    border-left-color: var(--success);
    color: #065f46;
}

.message.warning {
    background: var(--warning-light);
    border-left-color: var(--warning);
    color: #92400e;
}

.message.error {
    background: var(--error-light);
    border-left-color: var(--error);
    color: #991b1b;
}

.message h4 {
    margin-top: 0;
    margin-bottom: var(--spacing-sm);
    font-size: 1.2rem;
}

.message p {
    margin: 0;
}

/* ============================================
   表格样式
   ============================================ */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: var(--white);
    border-radius: var(--radius-md);
    overflow: hidden;
}

th {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
    color: var(--text-white);
    font-weight: 600;
    padding: var(--spacing-md);
    text-align: left;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--white-gray);
    color: var(--text-secondary);
}

td:last-child {
    white-space: nowrap;
}

tr:nth-child(even) {
    background-color: var(--white-off);
}

tr:hover {
    background-color: var(--primary-blue-lightest);
    transition: background-color 0.2s;
}

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

/* ============================================
   导航菜单
   ============================================ */
.nav {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.nav-item {
    margin: 0;
}

.nav-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-lg);
    text-decoration: none;
    font-weight: 500;
    border-radius: var(--radius-md);
}

/* ============================================
   统计卡片
   ============================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.stat-card {
    text-align: center;
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, var(--white) 0%, var(--white-off) 100%);
    border: 2px solid var(--primary-blue-lightest);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    margin: var(--spacing-md) 0;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ============================================
   分页样式
   ============================================ */
.pagination {
    display: flex;
    justify-content: center;
    margin: var(--spacing-xl) 0;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.pagination a, .pagination span {
    margin: 0;
}

.pagination .current {
    background: var(--primary-blue-dark);
    color: var(--text-white);
    font-weight: 600;
    cursor: default;
}

.pagination .current:hover {
    transform: none;
}

/* ============================================
   管理端布局
   ============================================ */
.admin-container {
    display: flex;
    gap: var(--spacing-xl);
    align-items: flex-start;
}

.sidebar {
    width: 250px;
    flex-shrink: 0;
}

.sidebar-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-menu li {
    margin-bottom: var(--spacing-sm);
}

.sidebar-menu a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all 0.3s;
}

.sidebar-menu a:hover {
    background: var(--primary-blue-lightest);
    transform: translateX(4px);
}

.sidebar-menu a.active {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
    color: var(--text-white);
    box-shadow: var(--shadow-md);
}

.main-content {
    flex-grow: 1;
    min-width: 0;
}

/* ============================================
   管理后台用户信息
   ============================================ */
.admin-user-info {
    color: var(--text-primary);
    font-size: 0.9rem;
    margin-left: var(--spacing-lg);
    display: none;
}

@media (min-width: 769px) {
    .admin-user-info {
        display: block;
    }
}

/* ============================================
   小标题头部
   ============================================ */
.page-header-small {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--primary-blue-light);
}

.page-header-small h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    border: none;
    padding: 0;
}

/* ============================================
   操作按钮图标样式
   ============================================ */
.action-buttons {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
    flex-wrap: wrap;
}

.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background: var(--white-off);
    border: 1px solid var(--white-gray);
    color: var(--text-primary);
    font-size: 1.2rem;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: var(--shadow-sm);
    padding: 0;
    line-height: 1;
}

.icon-btn:hover {
    background: var(--primary-blue-lightest);
    border-color: var(--primary-blue-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.icon-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.icon-btn-danger {
    color: var(--error);
}

.icon-btn-danger:hover {
    background: var(--error-light);
    border-color: var(--error);
}

/* ============================================
   紧凑表单样式
   ============================================ */
.compact-form-card {
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.compact-form-card h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary-blue-dark);
}

.inline-form {
    margin: 0;
}

.form-row {
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.form-group-inline {
    flex: 1;
    min-width: 150px;
}

.form-group-inline label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.form-group-inline .neumorphic-input {
    margin-bottom: 0;
}

.form-group-inline small {
    display: block;
    margin-top: var(--spacing-xs);
    color: var(--text-light);
    font-size: 0.8rem;
}

.form-group-inline .neumorphic-btn {
    margin-bottom: 0;
    white-space: nowrap;
}

/* ============================================
   链接样式
   ============================================ */
a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--primary-blue-dark);
    text-decoration: underline;
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .admin-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
    }
    
    .sidebar-menu {
        display: flex;
        overflow-x: auto;
        padding-bottom: var(--spacing-sm);
        gap: var(--spacing-sm);
    }
    
    .sidebar-menu li {
        margin-right: 0;
        margin-bottom: 0;
        flex-shrink: 0;
    }
    
    .admin-user-info {
        display: none;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .stat-value {
        font-size: 2rem;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .form-actions .neumorphic-btn {
        width: 100%;
    }
    
    .nav {
        flex-direction: column;
    }
    
    .nav-item {
        width: 100%;
    }
    
    .nav-link {
        text-align: center;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }
    
    .neumorphic-card {
        padding: var(--spacing-md);
    }
    
    table {
        font-size: 0.875rem;
    }
    
    th, td {
        padding: var(--spacing-sm);
    }
}

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

.text-right {
    text-align: right;
}

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

/* ============================================
   动画效果
   ============================================ */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.fade-in {
    animation: fadeIn 0.3s ease-out;
}

/* ============================================
   滚动条样式
   ============================================ */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--white-gray);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-blue);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-blue-dark);
}

/* ============================================
   顶部导航栏
   ============================================ */
.top-navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    border-bottom: 1px solid rgba(37, 99, 235, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    margin: 0;
    padding: 0;
    align-items: center;
}

.nav-menu .nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all 0.3s;
    position: relative;
}

.nav-menu .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-blue);
    transition: all 0.3s;
    transform: translateX(-50%);
}

.nav-menu .nav-link:hover {
    color: var(--primary-blue);
    background: var(--primary-blue-lightest);
}

.nav-menu .nav-link:hover::after {
    width: 80%;
}

.nav-menu .nav-link.active {
    color: var(--primary-blue);
    background: var(--primary-blue-lightest);
    font-weight: 600;
}

.nav-menu .nav-link.active::after {
    width: 80%;
}

.nav-link-admin {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
    color: var(--text-white) !important;
}

.nav-link-admin:hover {
    background: linear-gradient(135deg, var(--primary-blue-dark) 0%, var(--primary-blue) 100%);
    color: var(--text-white) !important;
}

.nav-link-admin::after {
    display: none;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--primary-blue);
    border-radius: 2px;
    transition: all 0.3s;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* ============================================
   主内容包装器
   ============================================ */
.main-wrapper {
    margin-top: 70px;
    min-height: calc(100vh - 70px);
}

/* ============================================
   英雄横幅区域
   ============================================ */
.hero-section {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-dark) 100%);
    color: var(--text-white);
    padding: var(--spacing-2xl) var(--spacing-lg);
    text-align: center;
    position: relative;
    overflow: hidden;
    margin-bottom: var(--spacing-2xl);
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

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

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-white);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin: 0;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-xl);
    flex-wrap: wrap;
}

.btn-hero {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.1rem;
}

.btn-hero-secondary {
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.5);
    color: var(--text-white);
}

.btn-hero-secondary:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.7);
}

/* ============================================
   页面头部
   ============================================ */
.page-header {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-dark) 100%);
    color: var(--text-white);
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.page-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-white);
    border: none;
    padding: 0;
}

.page-header p {
    font-size: 0.95rem;
    color: rgba(255, 255, 255, 0.9);
    margin: 0;
}

/* ============================================
   内容卡片
   ============================================ */
.content-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    border: 1px solid rgba(37, 99, 235, 0.1);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.auth-form {
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   功能介绍区域
   ============================================ */
.intro-section {
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-2xl) 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.feature-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--white-gray);
    transition: all 0.3s;
    text-align: center;
}

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.feature-card h3 {
    font-size: 1.5rem;
    color: var(--primary-blue-dark);
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.feature-link {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.feature-link:hover {
    color: var(--primary-blue-dark);
    text-decoration: underline;
}

/* ============================================
   系统特点区域
   ============================================ */
.features-section {
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-2xl) 0;
    background: var(--white-off);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
}

.features-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.feature-item {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
}

.feature-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-blue-light);
    line-height: 1;
    flex-shrink: 0;
}

.feature-content h3 {
    font-size: 1.25rem;
    color: var(--primary-blue-dark);
    margin-bottom: var(--spacing-sm);
}

.feature-content p {
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

/* ============================================
   技术优势区域
   ============================================ */
.tech-section {
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-2xl) 0;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.tech-item {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--primary-blue);
    transition: all 0.3s;
}

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

.tech-item h4 {
    font-size: 1.25rem;
    color: var(--primary-blue-dark);
    margin-bottom: var(--spacing-sm);
}

.tech-item p {
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

/* ============================================
   工作流程区域
   ============================================ */
.workflow-section {
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-2xl) 0;
    background: var(--white-off);
    border-radius: var(--radius-lg);
}

.workflow-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.workflow-step {
    text-align: center;
    flex: 1;
    min-width: 150px;
}

.step-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
    color: var(--text-white);
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    box-shadow: var(--shadow-md);
}

.step-content h3 {
    font-size: 1.25rem;
    color: var(--primary-blue-dark);
    margin-bottom: var(--spacing-xs);
}

.step-content p {
    color: var(--text-secondary);
    margin: 0;
    font-size: 0.95rem;
}

.workflow-arrow {
    font-size: 2rem;
    color: var(--primary-blue-light);
    font-weight: 700;
}

/* ============================================
   授权验证说明区域
   ============================================ */
.auth-section {
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-2xl) 0;
}

.auth-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.auth-card {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--white-gray);
    transition: all 0.3s;
}

.auth-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-blue-light);
}

.auth-card h3 {
    font-size: 1.25rem;
    color: var(--primary-blue-dark);
    margin-bottom: var(--spacing-sm);
}

.auth-card p {
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

.auth-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-xl);
}

/* ============================================
   内容区域
   ============================================ */
.content-section {
    margin-bottom: var(--spacing-2xl);
    scroll-margin-top: 90px;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-lg) 0;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    border: none;
    padding: 0;
}

.section-header p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin: 0;
}

/* ============================================
   页脚
   ============================================ */
.footer-section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(37, 99, 235, 0.1);
    padding: var(--spacing-2xl) var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.footer-brand h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-blue-dark);
    margin-bottom: var(--spacing-sm);
}

.footer-brand p {
    color: var(--text-secondary);
    margin: 0;
}

.footer-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.footer-link {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.footer-link:hover {
    color: var(--primary-blue-dark);
    text-decoration: underline;
}

.footer-divider {
    color: var(--text-light);
}

.footer-copyright {
    max-width: 1200px;
    margin: var(--spacing-lg) auto 0;
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--white-gray);
}

.footer-copyright p {
    color: var(--text-light);
    margin: 0;
    font-size: 0.9rem;
}

/* ============================================
   响应式设计 - 导航栏
   ============================================ */
@media (max-width: 768px) {
    .nav-container {
        padding: var(--spacing-sm) var(--spacing-md);
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }
    
    .nav-brand {
        flex: 0 0 auto;
    }
    
    .nav-brand h1 {
        font-size: 1.25rem;
    }
    
    .mobile-menu-toggle {
        display: none;
    }
    
    .nav-menu {
        position: relative;
        top: auto;
        left: auto;
        right: auto;
        background: transparent;
        backdrop-filter: none;
        flex-direction: row;
        padding: 0;
        box-shadow: none;
        max-height: none;
        overflow: visible;
        transition: none;
        gap: var(--spacing-xs);
        flex-wrap: wrap;
        flex: 1 1 auto;
        justify-content: flex-start;
    }
    
    .nav-menu.active {
        max-height: none;
        padding: 0;
    }
    
    .nav-menu .nav-link {
        width: auto;
        text-align: center;
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.85rem;
        white-space: nowrap;
    }
    
    .admin-user-info {
        flex: 0 0 100%;
        order: 3;
        text-align: center;
        font-size: 0.9rem;
        margin-top: var(--spacing-xs);
    }
    
    .hero-title {
        font-size: 1.8rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .page-header h2 {
        font-size: 1.8rem;
    }
    
    .page-header p {
        font-size: 1rem;
    }
    
    .section-header h2 {
        font-size: 1.8rem;
    }
    
    .section-header p {
        font-size: 1rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .features-list {
        grid-template-columns: 1fr;
    }
    
    .tech-grid {
        grid-template-columns: 1fr;
    }
    
    .workflow-steps {
        flex-direction: column;
    }
    
    .workflow-arrow {
        transform: rotate(90deg);
        margin: var(--spacing-sm) 0;
    }
    
    .auth-info {
        grid-template-columns: 1fr;
    }
    
    .auth-actions {
        flex-direction: column;
    }
    
    .auth-actions .neumorphic-btn {
        width: 100%;
    }
    
    .form-row {
        flex-direction: column;
        align-items: stretch;
    }
    
    .form-group-inline {
        min-width: 100%;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero-buttons .neumorphic-btn {
        width: 100%;
    }
    
    .content-card {
        padding: var(--spacing-lg);
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.5rem;
    }
    
    .page-header h2 {
        font-size: 1.5rem;
    }
    
    .section-header h2 {
        font-size: 1.5rem;
    }
    
    .content-card {
        padding: var(--spacing-md);
    }
    
    .feature-card {
        padding: var(--spacing-md);
    }
    
    .footer-brand h3 {
        font-size: 1.25rem;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .form-actions .neumorphic-btn {
        width: 100%;
    }
    
    .form-row {
        flex-direction: column;
    }
    
    .form-group-inline {
        min-width: 100%;
    }
    
    .compact-form-card {
        padding: var(--spacing-sm) var(--spacing-md);
    }
}

/* ============================================
   帮助提示图标
   ============================================ */
.help-icon {
    display: inline-block;
    width: 18px;
    height: 18px;
    line-height: 18px;
    text-align: center;
    border-radius: 50%;
    background: var(--primary-blue-light);
    color: var(--white);
    font-size: 12px;
    cursor: help;
    margin-left: var(--spacing-xs);
    position: relative;
    vertical-align: middle;
    transition: all 0.3s;
}

.help-icon:hover {
    background: var(--primary-blue-dark);
    transform: scale(1.1);
}

.help-icon-tooltip {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    margin-bottom: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--text-primary);
    color: var(--white);
    font-size: 0.85rem;
    white-space: nowrap;
    border-radius: var(--radius-sm);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
    z-index: 1000;
    box-shadow: var(--shadow-lg);
}

.help-icon-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-top-color: var(--text-primary);
}

.help-icon:hover .help-icon-tooltip {
    opacity: 1;
}