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

:root {
    --primary-color: #4CAF50;
    --danger-color: #f44336;
    --warning-color: #ff9800;
    --info-color: #2196F3;
    --bg-color: #f5f5f5;
    --card-bg: #ffffff;
    --text-color: #333;
    --border-color: #ddd;
    --shadow: 0 2px 8px rgba(0,0,0,0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

/* 登录页面样式 */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-box {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 400px;
}

.login-box h1 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--text-color);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.btn {
    width: 100%;
    padding: 12px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.3s;
}

.btn:hover {
    background: #45a049;
}

.btn:disabled {
    background: #ccc;
    cursor: not-allowed;
}

/* 主界面样式 */
.main-container {
    display: none;
}

.header {
    background: white;
    padding: 15px 30px;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header h1 {
    font-size: 24px;
    color: var(--primary-color);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-info {
    font-size: 14px;
    color: #666;
}

.btn-logout {
    padding: 8px 16px;
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-logout:hover {
    background: #da190b;
}

.content {
    max-width: 1400px;
    margin: 30px auto;
    padding: 0 20px;
}

/* 统计卡片 */
.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 20px;
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
}

.stat-icon.primary { background: rgba(76, 175, 80, 0.1); }
.stat-icon.info { background: rgba(33, 150, 243, 0.1); }
.stat-icon.warning { background: rgba(255, 152, 0, 0.1); }

.stat-info h3 {
    font-size: 14px;
    color: #666;
    font-weight: 400;
}

.stat-info p {
    font-size: 28px;
    font-weight: 700;
    margin-top: 5px;
}

/* 工具栏 */
.toolbar {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    align-items: center;
}

.upload-area {
    flex: 1;
    min-width: 300px;
}

.file-input-wrapper {
    position: relative;
    overflow: hidden;
    display: inline-block;
}

.file-input-wrapper input[type=file] {
    position: absolute;
    left: -9999px;
}

.btn-upload {
    padding: 10px 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-upload:hover {
    background: #45a049;
}

.search-box {
    flex: 1;
    min-width: 250px;
}

.search-box input {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 14px;
}

.btn-danger {
    padding: 10px 20px;
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
}

.btn-danger:hover {
    background: #da190b;
}

.btn-danger:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.btn-refresh {
    padding: 10px 20px;
    background: var(--info-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
}

.btn-refresh:hover {
    background: #0b7dda;
}

/* 图片网格 */
.images-container {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    min-height: 400px;
}

.images-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.image-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
    position: relative;
}

.image-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.image-card.selected {
    border: 3px solid var(--primary-color);
}

.image-checkbox {
    position: absolute;
    top: 10px;
    left: 10px;
    width: 24px;
    height: 24px;
    cursor: pointer;
    z-index: 10;
}

.image-wrapper {
    width: 100%;
    height: 200px;
    background: #f9f9f9;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    cursor: pointer;
}

.image-wrapper img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.image-info {
    padding: 15px;
}

.image-filename {
    font-size: 12px;
    color: #666;
    margin-bottom: 8px;
    word-break: break-all;
}

.image-meta {
    font-size: 11px;
    color: #999;
    margin-bottom: 10px;
}

.image-actions {
    display: flex;
    gap: 8px;
}

.btn-small {
    flex: 1;
    padding: 6px 12px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    transition: background 0.3s;
}

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

.btn-copy:hover {
    background: #0b7dda;
}

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

.btn-delete:hover {
    background: #da190b;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #999;
}

.empty-state-icon {
    font-size: 80px;
    margin-bottom: 20px;
}

/* 加载状态 */
.loading {
    text-align: center;
    padding: 40px;
    color: #999;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 提示消息 */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 20px;
    border-radius: 5px;
    color: white;
    font-size: 14px;
    z-index: 1000;
    animation: slideIn 0.3s ease-out;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.toast.success { background: var(--primary-color); }
.toast.error { background: var(--danger-color); }
.toast.info { background: var(--info-color); }

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* 图片预览模态框 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.9);
    z-index: 2000;
    justify-content: center;
    align-items: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    max-width: 90%;
    max-height: 90%;
    position: relative;
}

.modal-content img {
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 40px;
    color: white;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
    z-index: 2001;
}

.modal-close:hover {
    color: #ccc;
}

.select-all-container {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 15px;
    }

    .toolbar {
        flex-direction: column;
    }

    .images-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }

    .image-wrapper {
        height: 150px;
    }
}