/* 基础样式 */
:root {
    --primary-color: #4a90e2;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-gray: #f8f9fa;
    --dark-gray: #343a40;
    --border-color: #dee2e6;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-gray);
    background-color: var(--light-gray);
}

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

/* 头部样式 */
.main-header {
    background-color: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo-icon {
    font-size: 2.5em;
    color: var(--primary-color);
}

/* 筛选区域样式 */
.filter-container {
    background-color: white;
    padding: 15px;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.filter-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.filter-group select {
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1em;
    min-width: 120px;
}

/* 按钮样式 */
button {
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
}

button i {
    font-size: 0.9em;
}

.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;
}

/* 任务列表样式 */
.task-container {
    background-color: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.task-item {
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 10px;
    transition: all 0.3s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-left: 20px;
    border-left: 4px solid var(--border-color);
    cursor: pointer;
    padding-left: 40px;
    position: relative;
}

.task-item:hover {
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.task-info {
    flex: 1;
    margin-right: 20px;
}

.task-info h3 {
    margin-bottom: 8px;
    color: var(--dark-gray);
}

.task-info p {
    color: #666;
    margin-bottom: 8px;
}

.task-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.task-actions button {
    padding: 6px 12px;
    font-size: 0.9em;
}

/* 状态指示器样式 */
.task-item.completed {
    background-color: var(--light-gray);
    opacity: 0.7;
    border-left: 4px solid var(--success-color);
}

.task-item.overdue {
    border-left: 4px solid var(--danger-color);
}

.task-item.urgent {
    border-left: 4px solid var(--warning-color);
}

.task-item.warning {
    border-left: 4px solid var(--info-color);
}

/* 模态框基础样式 */
.modal {
    display: none;  /* 默认隐藏 */
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    z-index: 1000;
}

/* 任务编辑模态框样式 */
.modal-content {
    background-color: white;
    padding: 25px;
    border-radius: 10px;
    width: 90%;
    max-width: 500px;
    margin: 50px auto;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark-gray);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1em;
}

.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);
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 20px;
}

/* Loading 模态框样式 */
.loading-modal {
    background-color: rgba(0, 0, 0, 0.3);
}

.loading-content {
    background-color: white;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    width: 200px;
    margin: 200px auto;
}

.spinner {
    width: 40px;
    height: 40px;
    margin: 0 auto 10px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 确认对话框样式 */
.confirm-content {
    max-width: 400px;
    text-align: center;
}

.confirm-actions {
    margin-top: 20px;
    display: flex;
    justify-content: center;
    gap: 10px;
}

#confirmMessage {
    margin: 20px 0;
    color: #666;
}

/* 通知系统样式 */
.notification-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-width: 300px;
}

.notification {
    background-color: white;
    border-radius: 8px;
    padding: 15px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    display: flex;
    align-items: center;
    gap: 10px;
    animation: slideIn 0.3s ease;
}

.notification .spinner {
    width: 20px;
    height: 20px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid #3498db;
}

.notification.success {
    border-left: 4px solid var(--success-color);
}

.notification.error {
    border-left: 4px solid var(--danger-color);
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

/* 日期分组样式 */
.date-header {
    font-size: 1.2em;
    font-weight: 500;
    color: var(--dark-gray);
    padding: 15px 0 10px 0;
    margin-top: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.date-header:first-child {
    margin-top: 0;
}

.date-header::before {
    content: '';
    display: block;
    width: 4px;
    height: 24px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

.date-header .date-text {
    color: var(--dark-gray);
}

.date-header .weekday {
    color: var(--secondary-color);
    font-size: 0.9em;
    font-weight: normal;
}

/* 添加复选框样式 */
.task-checkbox {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.task-item.completed .task-checkbox {
    background-color: var(--success-color);
    border-color: var(--success-color);
}

.task-item.completed .task-checkbox::after {
    content: '✓';
    color: white;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 12px;
}

/* 任务详情样式 */
.task-description {
    display: none;
    padding-top: 10px;
    margin-top: 10px;
    border-top: 1px solid var(--border-color);
}

.task-item.expanded .task-description {
    display: block;
}

/* 状态指示器样式调整 */
.task-item.completed {
    opacity: 0.7;
}

.task-item.overdue {
    border-left-color: var(--danger-color);
}

.task-item.urgent {
    border-left-color: var(--warning-color);
}

.task-item.warning {
    border-left-color: var(--info-color);
}

/* 其他现有样式保持不变 */

/* 美化时间显示 */
.task-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.task-time {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.9em;
    background-color: var(--light-gray);
}

.task-time.overdue {
    color: var(--danger-color);
    background-color: rgba(220, 53, 69, 0.1);
}

.task-time.today {
    color: var(--warning-color);
    background-color: rgba(255, 193, 7, 0.1);
}

.task-time.tomorrow {
    color: var(--info-color);
    background-color: rgba(23, 162, 184, 0.1);
}

/* 添加新的动画效果 */
@keyframes flash {
    0% { background-color: rgba(74, 144, 226, 0.2); }
    100% { background-color: white; }
}

@keyframes slideOut {
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 添加响应式设计 */
@media screen and (max-width: 768px) {
    .toolbar {
        flex-direction: column;
        gap: 10px;
        padding: 10px;
    }

    .toolbar-group {
        width: 100%;
        display: flex;
        gap: 10px;
    }

    .filter-group {
        flex-wrap: wrap;
    }

    .filter-group select {
        flex: 1;
        min-width: 120px;
    }

    .add-task-btn {
        width: 100%;
    }

    .toggle-completed-btn {
        flex: 1;
    }

    /* 其他移动端样式保持不变 */
    button {
        font-size: 14px;
        padding: 8px 12px;
    }

    select {
        font-size: 14px;
        padding: 8px;
    }
}

/* 针对更小的屏幕进行优化 */
@media screen and (max-width: 480px) {
    .toolbar-group button span {
        display: none;
    }

    .toolbar-group button i {
        margin: 0;
    }

    .add-task-btn {
        padding: 8px;
    }

    .toggle-completed-btn {
        padding: 8px;
    }

    /* 调整任务操作按钮 */
    .task-actions {
        flex-direction: column;
        gap: 5px;
    }

    .task-actions button {
        width: 100%;
    }
}

/* 基础样式优化 */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background: var(--background-color);
    border-bottom: 1px solid var(--border-color);
    gap: 15px;
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.filter-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

button i {
    margin-right: 5px;
}

/* 添加空状态样式 */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    background: var(--background-color);
    border-radius: 8px;
    margin: 20px 0;
}

.empty-state .empty-icon {
    font-size: 48px;
    margin-bottom: 16px;
    animation: bounce 2s infinite;
}

.empty-state h3 {
    color: var(--dark-gray);
    margin-bottom: 8px;
    font-size: 1.2em;
}

.empty-state p {
    color: var(--secondary-color);
    margin-bottom: 24px;
}

.empty-state button {
    padding: 10px 20px;
    font-size: 1em;
}

/* 添加弹跳动画 */
@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* 响应式调整 */
@media screen and (max-width: 768px) {
    .empty-state {
        padding: 30px 15px;
    }
    
    .empty-state .empty-icon {
        font-size: 36px;
    }
}