/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    cursor: default;
}

body {
    background-color: #F3F4F6;
    color: #1F2937;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 1rem;
    line-height: 1.5;
}

.container {
    width: 60%;
    min-width: 25rem;
    max-width: 56rem;
}

/* 头部样式 */
header {
    text-align: center;
    margin: 2rem 0;
}

h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    color: #1F2937;
    margin-bottom: 1rem;
    font-family: serif;
}

header p {
    color: #6B7280;
    font-size: 1.1rem;
    font-family: serif;
}

/* 添加任务区域 */
.add-task-container {
    background-color: white;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    padding: 1rem;
    margin-bottom: 1.5rem;
    transition: all 0.3s ease;
}

#add-task-form {
    display: flex;
    gap: 1rem;
}

#task-input {
    flex: 1;
    padding: 0.5rem 1rem;
    border: 1px solid #D1D5DB;
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: all 0.2s ease;
    cursor: text;
}

#task-input:focus {
    outline: none;
    border-color: #4f8be4;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

button[type="submit"] {
    background-color: #4f8be4;
    color: white;
    padding: 0.5rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    transition: all 0.2s ease;
}

button[type="submit"]:hover {
    background-color: #1368e8;
}

/* 颜色筛选区域 */
.color-filter {
    margin-bottom: 1.5rem;
    text-align: center;
}

.filter-buttons {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
}

.filter-btn {
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.filter-btn[data-filter="all"] {
    background-color: #9CA3AF;
}

.filter-btn[data-filter="red"] {
    background-color: #EF4444;
}

.filter-btn[data-filter="orange"] {
    background-color: #F97316;
}

.filter-btn[data-filter="yellow"] {
    background-color: #EAB308;
}

.filter-btn[data-filter="green"] {
    background-color: #22C55E;
}

.filter-btn[data-filter="cyan"] {
    background-color: #06B6D4;
}

.filter-btn[data-filter="blue"] {
    background-color: #3B82F6;
}

.filter-btn[data-filter="purple"] {
    background-color: #8B5CF6;
}

.filter-btn[data-filter="white"] {
    background-color: white;
    border: 1px solid #D1D5DB;
}

.filter-btn:hover {
    opacity: 0.8;
}

.filter-active {
    box-shadow: 0 0 0 2px white, 0 0 0 4px #4F46E5;
}

/* 任务列表区域 */
.task-list-container {
    background-color: white;
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    overflow: hidden;
}

#empty-state {
    padding: 4rem 1rem;
    text-align: center;
    color: #6B7280;
}

#empty-state p {
    font-family: serif;
    font-size: 1.1rem;
}

#task-list {
    list-style: none;
    border-top: 1px solid #E5E7EB;
    display: none;
}

.task-item {
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: all 0.2s ease;
    border-bottom: 1px solid #E5E7EB;
}

.task-item.bg-task-red {
    background-color: rgba(239, 68, 68, 0.1);
}

.task-item.bg-task-orange {
    background-color: rgba(249, 115, 22, 0.1);
}

.task-item.bg-task-yellow {
    background-color: rgba(234, 179, 8, 0.1);
}

.task-item.bg-task-green {
    background-color: rgba(34, 197, 94, 0.1);
}

.task-item.bg-task-cyan {
    background-color: rgba(6, 182, 212, 0.1);
}

.task-item.bg-task-blue {
    background-color: rgba(59, 130, 246, 0.1);
}

.task-item.bg-task-purple {
    background-color: rgba(139, 92, 246, 0.1);
}

/* 复选框样式 */
.checkbox-custom {
    width: 1.25rem;
    height: 1.25rem;
    border-radius: 0.25rem;
    border: 2px solid #D1D5DB;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.checkbox-checked {
    background-color: #4f8be4;
    border-color: #4f8be4;
    color: white;
}

/* 任务文本 */
.task-item-content {
    flex: 1;
}

.task-text {
    cursor: pointer;
    transition: color 0.2s ease;
    color: #1F2937;
    font-weight: bold;
}

.task-completed {
    text-decoration: line-through;
    color: #9CA3AF;
}

/* 颜色选择方块 */
.color-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.1rem;
}

.color-square {
    width: 1.25rem;
    height: 1.25rem;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 2px solid transparent;
}

.color-square:hover {
    transform: scale(1.1);
}

.color-square-selected {
    border-color: #4B5563;
    transform: scale(1.1);
}

.color-square.bg-task-white {
    background-color: white;
    border: 1px solid #D1D5DB;
}

.color-square.bg-task-red {
    background-color: #EF4444;
}

.color-square.bg-task-orange {
    background-color: #F97316;
}

.color-square.bg-task-yellow {
    background-color: #EAB308;
}

.color-square.bg-task-green {
    background-color: #22C55E;
}

.color-square.bg-task-cyan {
    background-color: #06B6D4;
}

.color-square.bg-task-blue {
    background-color: #3B82F6;
}

.color-square.bg-task-purple {
    background-color: #8B5CF6;
}

/* 删除按钮 */
.delete-btn {
    color: #9CA3AF;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    transform: scale(1.5);
    transition: all 0.2s ease;
}

.delete-btn:hover {
    color: #EF4444;
    transform: scale(2);
}

/* 任务统计 */
.task-stats {
    margin: 1.5rem 2rem;
    color: #6B7280;
    font-size: 1rem;
    display: flex;
    align-items: center;
}

#clear-completed, 
#clear-all {
    color: #4f8be4;
    background: none;
    display: inline;
    margin: auto;
    border: none;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

#clear-completed:hover, 
#clear-all:hover {
    color: #1368e8;
}

/* 底部信息 */
.footer-info {
    margin-top: auto;
    padding-top: 1.5rem;
    border-top: 1px solid #eee;
    color: #868e96;
    font-size: 0.9rem;
    text-align: center;
}

.footer-info p {
    margin: 0.3rem 0;
}


/* 响应式调整 */
@media (max-width: 640px) {
    .task-item {
        gap: 0.75rem;
        padding: 0.75rem;
    }
    
    .color-square {
        width: 1rem;
        height: 1rem;
    }
    
    button[type="submit"] {
        padding: 0.5rem 1rem;
    }
    
    button[type="submit"] span {
        display: none;
    }
}