/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #06b6d4;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --dark-color: #1f2937;
    --light-color: #f3f4f6;
    --white: #ffffff;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-600: #4b5563;
    --gray-800: #1f2937;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --radius-lg: 12px;
}

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

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

/* 导航栏 */
.navbar {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: var(--white);
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo i {
    font-size: 1.75rem;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.5rem;
}

.nav-link {
    color: var(--white);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    transition: all 0.3s ease;
    font-weight: 500;
}

.nav-link:hover,
.nav-item.active .nav-link {
    background-color: rgba(255, 255, 255, 0.2);
}

/* 主要内容区 */
.main-content {
    flex: 1;
    padding: 2rem 0;
}

/* 页面标题 */
.page-header {
    text-align: center;
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 2rem;
    color: var(--gray-800);
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--gray-600);
}

/* 卡片样式 */
.card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 2rem;
    margin-bottom: 2rem;
}

.card-title {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--gray-800);
}

/* 上传区域 */
.upload-area {
    border: 2px dashed var(--gray-300);
    border-radius: var(--radius-lg);
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background-color: var(--gray-100);
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary-color);
    background-color: rgba(79, 70, 229, 0.05);
}

.upload-area i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.upload-area h3 {
    color: var(--gray-800);
    margin-bottom: 0.5rem;
}

.upload-area p {
    color: var(--gray-600);
    font-size: 0.875rem;
}

.upload-input {
    display: none;
}

/* 图片预览 */
.preview-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

.preview-box {
    text-align: center;
}

.preview-box h4 {
    margin-bottom: 1rem;
    color: var(--gray-800);
}

.preview-image {
    max-width: 100%;
    max-height: 400px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

/* 图片占位符样式 */
.preview-placeholder {
    width: 100%;
    min-height: 300px;
    background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-200) 100%);
    border: 2px dashed var(--gray-300);
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--gray-600);
    gap: 1rem;
    transition: all 0.3s ease;
}

.preview-placeholder:hover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 100%);
}

.preview-placeholder i {
    font-size: 3rem;
    opacity: 0.5;
}

.preview-placeholder span {
    font-size: 0.875rem;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
}

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

.btn-success {
    background-color: var(--success-color);
    color: var(--white);
}

.btn-success:hover {
    background-color: #059669;
}

.btn-secondary {
    background-color: var(--gray-200);
    color: var(--gray-800);
}

.btn-secondary:hover {
    background-color: var(--gray-300);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* 表单样式 */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--gray-800);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* 颜色选择器 */
.color-options {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.color-option {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    border: 3px solid transparent;
    transition: all 0.3s ease;
    position: relative;
}

.color-option:hover,
.color-option.active {
    border-color: var(--primary-color);
    transform: scale(1.1);
}

.color-option.active::after {
    content: '\f00c';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 1.2rem;
    text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}

/* 滑块样式 */
.range-slider {
    width: 100%;
    margin: 1rem 0;
}

.range-slider input[type="range"] {
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: var(--gray-200);
    outline: none;
    -webkit-appearance: none;
}

.range-slider input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: var(--shadow);
}

.range-value {
    text-align: center;
    font-weight: 600;
    color: var(--primary-color);
    margin-top: 0.5rem;
}

/* 加载动画 */
.loading {
    display: none;
    text-align: center;
    padding: 2rem;
}

.loading.active {
    display: block;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--gray-200);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

/* 提示信息 - 从右侧滑入 */
.alert {
    padding: 1rem 1.5rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    position: fixed;
    top: 80px;
    right: -100%;
    z-index: 9999;
    min-width: 300px;
    max-width: 500px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    animation: slideInFromRight 0.5s ease forwards;
}

@keyframes slideInFromRight {
    from {
        right: -100%;
        opacity: 0;
    }
    to {
        right: 20px;
        opacity: 1;
    }
}

.alert.hide {
    animation: slideOutToRight 0.3s ease forwards;
}

@keyframes slideOutToRight {
    from {
        right: 20px;
        opacity: 1;
    }
    to {
        right: -100%;
        opacity: 0;
    }
}

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.alert-error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-warning {
    background-color: #fef3c7;
    color: #92400e;
    border: 1px solid #fde68a;
}

/* 首页特色功能 */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    text-decoration: none;
    color: inherit;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.feature-icon i {
    font-size: 2rem;
    color: var(--white);
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--gray-800);
}

.feature-card p {
    color: var(--gray-600);
    font-size: 0.875rem;
}

/* 操作按钮组 */
.action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
    flex-wrap: wrap;
}

/* 页脚 */
.footer {
    background-color: var(--gray-800);
    color: var(--gray-300);
    padding: 2rem 0;
    text-align: center;
    margin-top: auto;
}

.footer p {
    margin: 0.25rem 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
        flex-direction: column;
        padding: 1rem;
        gap: 0;
        display: none;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-item {
        width: 100%;
    }

    .nav-link {
        display: block;
        padding: 0.75rem 1rem;
    }

    .preview-container {
        grid-template-columns: 1fr;
    }

    .page-header h1 {
        font-size: 1.5rem;
    }

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

/* 后台管理样式 */
.admin-container {
    display: flex;
    min-height: calc(100vh - 70px);
}

.admin-sidebar {
    width: 250px;
    background-color: var(--gray-800);
    color: var(--white);
    padding: 2rem 0;
}

.admin-sidebar ul {
    list-style: none;
}

.admin-sidebar a {
    display: block;
    padding: 0.75rem 1.5rem;
    color: var(--gray-300);
    text-decoration: none;
    transition: all 0.3s ease;
}

.admin-sidebar a:hover,
.admin-sidebar a.active {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--white);
}

.admin-content {
    flex: 1;
    padding: 2rem;
    background-color: var(--gray-100);
}

.admin-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
}

/* 统计卡片 */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-icon.blue {
    background-color: #dbeafe;
    color: #1e40af;
}

.stat-icon.green {
    background-color: #d1fae5;
    color: #065f46;
}

.stat-icon.orange {
    background-color: #ffedd5;
    color: #9a3412;
}

.stat-icon.red {
    background-color: #fee2e2;
    color: #991b1b;
}

.stat-info h4 {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-bottom: 0.25rem;
}

.stat-info p {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-800);
}

/* 表格样式 */
.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.table th {
    background-color: var(--gray-100);
    font-weight: 600;
    color: var(--gray-800);
}

.table tr:hover {
    background-color: var(--gray-100);
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge-success {
    background-color: #d1fae5;
    color: #065f46;
}

.badge-warning {
    background-color: #fef3c7;
    color: #92400e;
}

.badge-error {
    background-color: #fee2e2;
    color: #991b1b;
}