:root {
    --primary-color: #2ea44f;
    --primary-hover: #2c974b;
    --bg-color: #f6f8fa;
    --card-bg: #ffffff;
    --text-primary: #24292e;
    --text-secondary: #586069;
    --border-color: #e1e4e8;
    --animation-duration: 0.6s;
}

.year-btn {
    padding: 0.5rem 1.25rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.96rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 14px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    margin-bottom: .7rem;
}

.year-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-color);
    border-radius: 6px;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
    z-index: -1;
}

.year-btn:hover {
    color: var(--primary-hover);
    transform: scale(1.11);
}

.year-btn.active {
    color: white;
    transform: scale(1.05);
}

.year-btn.active::before {
    transform: scaleX(1);
}

/* 热力图样式 */
.contribution-calendar {
    position: relative;
    padding: 3.6rem .4rem 1.7rem;
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
}

.month-labels {
    position: absolute;
    top: 1.2rem;
    left: 2.8rem;
    right: 1rem;
    height: 20px;
}

.month-label {
    position: absolute;
    font-size: 0.85rem;
    color: var(--text-secondary);
    transform-origin: left;
    white-space: nowrap;
}

.week-labels {
    position: absolute;
    left: 1.2rem;
    top: 3.6rem;
    display: flex;
    flex-direction: column;
    gap: 0;
    height: calc(7 * 14px + 6 * 2px);
    justify-content: space-between;
}

.week-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-align: center;
    width: 1.5rem;
    height: 14px;
    line-height: 14px;
    opacity: 0.8;
}

.contribution-grid {
    margin-left: 3rem;
    display: grid;
    grid-template-columns: repeat(53, 14px);
    grid-template-rows: repeat(7, 14px);
    gap: 2px;
}

.contribution-cell {
    width: 14px;
    height: 14px;
    border-radius: 2px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    animation: scaleIn 0.15s ease forwards;
    transform: scale(0);
    opacity: 0;
    cursor: pointer;
}

.contribution-cell:hover {
    transform: scale(1.2);
}

.contribution-cell.outside-month {
    opacity: 0.7;
    border: 1px solid rgba(0, 0, 0, 0.03);
}

@keyframes scaleIn {
    from {
        transform: scale(0);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

/* 贡献等级颜色 */
.level-0 {
    background-color: #ebedf0;
}

.level-1 {
    background-color: #9be9a8;
}

.level-2 {
    background-color: #40c463;
}

.level-3 {
    background-color: #30a14e;
}

.level-4 {
    background-color: #216e39;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* 动画关键帧 */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar {
        padding: 1rem;
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        gap: 1rem;
    }

    .contribution-calendar {
        padding: 3rem 1rem 1.5rem;
    }

    .week-labels {
        left: 0.5rem;
    }

    .contribution-grid {
        margin-left: 2rem;
    }

    .month-labels {
        left: 2rem;
    }
}

/* 图例 */
.contribution-legend {
    display: flex;
    align-items: center;
    padding-top: 1.2rem;
    margin-top: 1rem;
    justify-content: center;
    gap: 0.75rem;
    color: var(--text-secondary);
    font-size: 1rem;
    border-top: 1px solid #eeeeee;
}

.legend-item {
    display: flex;
    align-items: center;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.2s ease;
    gap: 4px;
}

.legend-color {
    width: 14px;
    height: 14px;
    border-radius: 2px;
}

/* 更新热力图容器样式 */
#heatmap {
    margin: 20px 0;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    padding: 1.5rem;
    overflow-x: auto;
}

.heatmap-title {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin: 0;
    line-height: 1.4;
}

.heatmap-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.contribution-icon {
    color: var(--primary-color);
    display: flex;
    align-items: center;
    animation: rotate-in 0.6s ease;
    margin-top: 2px;
    /* 微调图标位置 */
}

/* 新增动画关键帧 */
@keyframes rotate-in {
    from {
        transform: rotate(-180deg);
        opacity: 0;
    }

    to {
        transform: rotate(0);
        opacity: 1;
    }
}

@keyframes slide-in-right {
    from {
        transform: translateX(20px);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }

    100% {
        transform: scale(1);
    }
}

.fade-out {
    animation: fadeOut 0.3s ease forwards;
}

@keyframes fadeOut {
    from {
        opacity: 1;
        transform: translateY(0);
    }

    to {
        opacity: 0;
        transform: translateY(-10px);
    }
}

/* 错误消息样式 */
.error-message {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    color: #cf222e;
    background-color: #ffebe9;
    border: 1px solid #ff818266;
    border-radius: 6px;
    padding: 0.75rem;
    margin-top: 0.5rem;
    font-size: 0.875rem;
    width: 100%;
    animation: slideInDown 0.3s ease;
}

.error-icon {
    fill: currentColor;
}

/* 加载状态样式 */
#refreshBtn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

/* 新增动画 */
@keyframes slideInDown {
    from {
        transform: translateY(-10px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* 热力图贡献等级 */
.contribution-cell.level-0 {
    background-color: #ebedf0;
}

.contribution-cell.level-1 {
    background-color: #9be9a8;
}

.contribution-cell.level-2 {
    background-color: #40c463;
}

.contribution-cell.level-3 {
    background-color: #30a14e;
}

.contribution-cell.level-4 {
    background-color: #216e39;
}

/* 未来日期样式 */
.contribution-cell.future-date {
    background-color: #f0f0f0;
    border: 1px dashed #ccc;
    opacity: 0.7;
}

.dark-mode .contribution-cell.future-date {
    background-color: #2d333b;
    border: 1px dashed #444c56;
}

/* 无数据时的提示样式 */
.empty-message {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    color: var(--text-secondary);
    font-size: 1.1rem;
    text-align: center;
    background-color: rgba(0, 0, 0, 0.02);
    border-radius: 8px;
    border: 1px dashed var(--border-color);
    margin: 1rem 0;
}

.fade-in {
    animation: fadeIn 0.3s ease forwards;
}