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

:root {
    --primary-color: #4a90e2;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --bg-color: #f5f5f5;
    --card-bg: #ffffff;
    --text-color: #333333;
    --text-light: #666666;
    --border-color: #e0e0e0;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 12px rgba(0,0,0,0.15);
}

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

/* 按钮样式 */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

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

.btn-primary:hover {
    background-color: #357abd;
}

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

.btn-secondary:hover {
    background-color: #5a6268;
}

.btn-icon {
    padding: 8px 12px;
    background: transparent;
    border: 1px solid var(--border-color);
}

.btn-block {
    width: 100%;
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: var(--text-color);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 14px;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(74, 144, 226, 0.2);
}

/* 认证页面 */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.auth-box {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
}

.app-title {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.app-subtitle {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 30px;
}

.auth-tabs {
    display: flex;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    padding: 10px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 16px;
    color: var(--text-light);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.3s;
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
}

.message {
    margin-top: 20px;
    padding: 10px;
    border-radius: 4px;
    display: none;
}

.message.error {
    background-color: #fee;
    color: var(--danger-color);
    border: 1px solid var(--danger-color);
    display: block;
}

.message.success {
    background-color: #efe;
    color: var(--success-color);
    border: 1px solid var(--success-color);
    display: block;
}

/* 容器和布局 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
}

.header h1 {
    color: var(--primary-color);
}

.header-actions {
    display: flex;
    gap: 10px;
}

/* 工具栏 */
.toolbar {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.search-input {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 14px;
}

/* 笔记网格 */
.notes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.note-card {
    background: var(--card-bg);
    padding: 0;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

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

.note-card-header {
    padding: 20px;
    cursor: pointer;
    flex: 1;
}

.note-card-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-color);
}

.note-card-content {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 15px;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
}

.note-card-meta {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-light);
}

.note-card-actions {
    display: flex;
    gap: 5px;
    padding: 10px 20px;
    background: var(--bg-color);
    border-top: 1px solid var(--border-color);
    justify-content: flex-end;
}

.note-card-actions .btn-icon {
    padding: 6px 10px;
    font-size: 14px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s;
}

.note-card-actions .btn-icon:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-light);
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 30px;
}

.pagination button {
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    cursor: pointer;
    border-radius: 4px;
}

.pagination button:hover:not(:disabled) {
    background-color: var(--primary-color);
    color: white;
}

.pagination button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination .active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* 分享页面 */
.share-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
}

.share-content {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
}

.share-title {
    margin-bottom: 20px;
    color: var(--text-color);
}

.share-meta {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.share-body {
    line-height: 1.8;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .auth-box {
        padding: 30px 20px;
    }
    
    .header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    
    .header-actions {
        width: 100%;
    }
    
    .header-actions .btn {
        flex: 1;
    }
    
    .notes-grid {
        grid-template-columns: 1fr;
    }
}