/* ===== 预设任务区域（任务加入模式） ===== */
.preset-tasks-section {
    margin-top: 30px;
    padding: 20px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 15px;
    border: 2px solid var(--border-color);
}

.preset-tasks-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
}

.preset-tasks-header i {
    font-size: 20px;
    color: var(--primary-green);
}

.preset-tasks-header h4 {
    margin: 0;
    font-size: 16px;
    color: var(--text-primary);
    flex: 1;
}

.preset-count {
    background: var(--primary-green);
    color: white;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.preset-tasks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 15px;
}

.preset-task-card {
    background: white;
    border-radius: 12px;
    padding: 15px;
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
    cursor: pointer;
}

.preset-task-card:hover {
    border-color: var(--primary-green);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(45, 134, 89, 0.15);
}

.preset-task-card.selected {
    border-color: var(--primary-green);
    background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
    box-shadow: 0 4px 16px rgba(45, 134, 89, 0.3);
    transform: scale(1.02);
}

.preset-task-time {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-green);
    margin-bottom: 8px;
}

.preset-task-time i {
    font-size: 16px;
}

.preset-task-device {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.preset-task-action {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.preset-task-btn {
    width: 100%;
    padding: 8px 15px;
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--dark-green) 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.preset-task-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(45, 134, 89, 0.3);
}

.preset-task-btn:active {
    transform: translateY(0);
}

.preset-task-btn i {
    font-size: 14px;
}

.preset-task-card.selected .preset-task-btn {
    background: linear-gradient(135deg, #4CAF50 0%, #2d8659 100%);
}

/* 空堆容器 */
.heap-empty-container {
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .preset-tasks-grid {
        grid-template-columns: 1fr;
    }
    
    .preset-tasks-section {
        padding: 15px;
    }
}