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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

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

/* 通用样式 */
.hidden {
    display: none !important;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: #007bff;
    color: white;
}

.btn-primary:hover {
    background: #0056b3;
    transform: translateY(-1px);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #545b62;
    transform: translateY(-1px);
}

.btn-secondary.active {
    background: #28a745;
}

.btn-danger {
    background: #dc3545;
    color: white;
}

.btn-danger:hover {
    background: #c82333;
    transform: translateY(-1px);
}

.btn-danger:disabled {
    background: #6c757d;
    cursor: not-allowed;
    transform: none;
}

.message {
    margin-top: 15px;
    padding: 10px;
    border-radius: 4px;
    text-align: center;
}

.message.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* 认证界面 */
.auth-section {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.auth-container {
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 400px;
}

.auth-container h1 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
    font-size: 28px;
}

.auth-tabs {
    display: flex;
    margin-bottom: 30px;
    border-bottom: 1px solid #eee;
}

.tab-button {
    flex: 1;
    padding: 12px;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 16px;
    color: #666;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
}

.tab-button.active {
    color: #007bff;
    border-bottom-color: #007bff;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

/* 主应用界面 */
.app-section {
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.header {
    background: #f8f9fa;
    padding: 20px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #eee;
}

.header h1 {
    color: #333;
    font-size: 24px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-info span {
    font-weight: 500;
    color: #666;
}

.main-content {
    padding: 30px;
}

/* 控制面板 */
.control-panel {
    margin-bottom: 30px;
}

.control-row {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.add-word-section {
    display: flex;
    gap: 10px;
    flex: 1;
    min-width: 300px;
}

.word-input {
    flex: 2;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
}

.meaning-input {
    flex: 2;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
}

.priority-input {
    width: 120px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
}

.batch-add-section {
    display: flex;
    gap: 10px;
    width: 100%;
}

.batch-textarea {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
    min-height: 80px;
    resize: vertical;
}

.view-controls, .data-controls {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

/* 单词列表 */
.words-section {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 20px;
}

.words-header {
    margin-bottom: 20px;
}

.words-header h2 {
    color: #333;
    font-size: 20px;
}

.words-list {
    display: grid;
    gap: 15px;
}

.word-item {
    background: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.word-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.word-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 10px;
}

.word-main {
    flex: 1;
}

.word-number {
    font-size: 14px;
    font-weight: 500;
    color: #007bff;
    margin-bottom: 3px;
}

.word-text {
    font-size: 20px;
    font-weight: 600;
    color: #333;
    margin-bottom: 5px;
}

.word-phonetic {
    font-size: 14px;
    color: #666;
    font-style: italic;
}

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

.btn-small {
    padding: 6px 12px;
    font-size: 12px;
    border-radius: 4px;
}

.word-meaning {
    color: #555;
    line-height: 1.5;
    margin-bottom: 10px;
}

.word-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: #999;
}

.word-priority {
    font-size: 10px;
    color: #666;
}

.priority-badge {
    background: #007bff;
    color: white;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 9px;
    font-weight: 500;
}

.priority-high {
    background: #dc3545;
}

.priority-medium {
    background: #ffc107;
    color: #333;
}

/* 模态框 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: white;
    border-radius: 8px;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
    color: #333;
}

.close-btn {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: #999;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn:hover {
    color: #333;
}

.modal-body {
    padding: 20px;
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: #333;
}

.form-input, .form-textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
}

.form-textarea {
    min-height: 80px;
    resize: vertical;
}

.modal-footer {
    padding: 20px;
    border-top: 1px solid #eee;
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

/* 加载动画 */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 2000;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #007bff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .auth-container {
        padding: 30px 20px;
    }
    
    .header {
        padding: 15px 20px;
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .main-content {
        padding: 20px;
    }
    
    .control-row {
        flex-direction: column;
    }
    
    .add-word-section {
        min-width: auto;
    }
    
    .word-input {
        flex: 1;
    }
    
    .priority-input {
        width: 100px;
    }
    
    .view-controls, .data-controls {
        justify-content: center;
    }
    
    .word-header {
        flex-direction: column;
        gap: 10px;
    }
    
    .word-actions {
        align-self: flex-end;
    }
    
    .word-meta {
        flex-direction: column;
        gap: 5px;
        align-items: flex-start;
    }
    
    .modal-content {
        width: 95%;
        margin: 20px;
    }
    
    .modal-footer {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .auth-container {
        padding: 20px 15px;
    }
    
    .header h1 {
        font-size: 20px;
    }
    
    .btn {
        padding: 8px 16px;
        font-size: 13px;
    }
    
    .word-text {
        font-size: 18px;
    }
    
    .add-word-section {
        flex-direction: column;
    }
    
    .priority-input {
        width: 100%;
    }
}

/* 显示模式样式 */
.words-list.english-only .word-meaning {
    display: none;
}

.words-list.chinese-only .word-english,
.words-list.chinese-only .word-phonetic {
    display: none;
}

.chinese-only .word-number {
    display: block;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #666;
}

.empty-state h3 {
    margin-bottom: 10px;
    color: #999;
}

.empty-state p {
    color: #bbb;
}

/* 警告消息样式 */
.warning-message {
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    border-radius: 6px;
    padding: 15px;
    margin-bottom: 20px;
}

.warning-message p {
    margin-bottom: 10px;
    color: #856404;
}

.warning-message p:last-child {
    margin-bottom: 0;
}

.warning-message strong {
    color: #721c24;
}

/* 警告按钮样式 */
.btn-warning {
    background-color: #ffc107;
    color: #212529;
    border: 1px solid #ffc107;
}

.btn-warning:hover {
    background-color: #e0a800;
    border-color: #d39e00;
    transform: translateY(-1px);
}

.btn-warning.active {
    background-color: #d39e00;
    border-color: #c69500;
}

/* 批量添加进度条 */
.batch-progress {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    z-index: 1001;
    min-width: 400px;
    display: none;
}

.progress-content {
    text-align: center;
}

.progress-text {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
    font-size: 16px;
    color: #333;
}

.progress-bar {
    width: 100%;
    height: 20px;
    background-color: #f0f0f0;
    border-radius: 10px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #007bff, #0056b3);
    border-radius: 10px;
    transition: width 0.3s ease;
    width: 0%;
}

@media (max-width: 768px) {
    .batch-progress {
        min-width: 300px;
        padding: 20px;
    }
    
    .progress-text {
        font-size: 14px;
    }
}