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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: #ffffff;
    color: #1f2937;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.changelog-item {
    opacity: 0;
    animation: fadeInUp 0.6s ease-out forwards;
}

.changelog-item:nth-child(1) { animation-delay: 0.1s; }
.changelog-item:nth-child(2) { animation-delay: 0.2s; }
.changelog-item:nth-child(3) { animation-delay: 0.3s; }
.changelog-item:nth-child(4) { animation-delay: 0.4s; }
.changelog-item:nth-child(5) { animation-delay: 0.5s; }
.changelog-item:nth-child(6) { animation-delay: 0.6s; }
.changelog-item:nth-child(7) { animation-delay: 0.7s; }
.changelog-item:nth-child(8) { animation-delay: 0.8s; }
.changelog-item:nth-child(9) { animation-delay: 0.9s; }
.changelog-item:nth-child(10) { animation-delay: 1.0s; }
.changelog-item:nth-child(11) { animation-delay: 1.1s; }
.changelog-item:nth-child(12) { animation-delay: 1.2s; }
.changelog-item:nth-child(13) { animation-delay: 1.3s; }
.changelog-item:nth-child(14) { animation-delay: 1.4s; }
.changelog-item:nth-child(15) { animation-delay: 1.5s; }
.changelog-item:nth-child(16) { animation-delay: 1.6s; }
.changelog-item:nth-child(17) { animation-delay: 1.7s; }
.changelog-item:nth-child(18) { animation-delay: 1.8s; }
.changelog-item:nth-child(19) { animation-delay: 1.9s; }
.changelog-item:nth-child(20) { animation-delay: 2.0s; }

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
}

.header {
    text-align: center;
    margin-bottom: 60px;
    padding-bottom: 40px;
    border-bottom: 1px solid #e5e7eb;
    animation: fadeInUp 0.6s ease-out forwards;
}

.header h1 {
    font-size: 32px;
    font-weight: 700;
    color: #111827;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
    animation: fadeInUp 0.6s ease-out 0.2s forwards;
    opacity: 0;
}

.header-btn {
    display: inline-block;
    padding: 12px 28px;
    background: #2563eb;
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    animation: fadeInUp 0.6s ease-out 0.4s forwards;
    opacity: 0;
}

.header-btn:hover {
    background: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.changelog {
    position: relative;
}

.changelog::before {
    display: none;
}

.changelog-item {
    position: relative;
    padding-left: 0;
    margin-bottom: 32px;
}

.changelog-dot {
    display: none;
}

.changelog-card {
    background: #fff;
    border: 1px solid #fff;
    border-radius: 12px;
    padding: 24px;
    transition: all 0.3s ease;
}

.changelog-card:hover {
    border-color: #2563eb;
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.12);
    transform: translateY(-4px);
}

.changelog-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 12px;
}

.changelog-project {
    font-size: 18px;
    font-weight: 700;
    color: #111827;
    display: flex;
    align-items: center;
    gap: 8px;
}

.changelog-date {
    font-size: 13px;
    color: #6b7280;
    font-weight: 500;
    padding: 4px 12px;
    border-radius: 20px;
}

.changelog-content {
    color: #4b5563;
    font-size: 15px;
    line-height: 1.8;
}

.changelog-content p {
    margin-bottom: 8px;
    padding-left: 20px;
    position: relative;
}

.changelog-content p::before {
    content: '';
    position: absolute;
    left: 0;
    top: 11px;
    width: 6px;
    height: 6px;
    background: #2563eb;
    border-radius: 50%;
}

.tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
    margin-right: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.2s ease;
}

.tag:hover {
    transform: scale(1.1);
}

.xinzeng {
    background: #dcfce7;
    color: #166534;
}

.youhua {
    background: #dbeafe;
    color: #1e40af;
}

.xiufu {
    background: #fef3c7;
    color: #92400e;
}

.zhongda {
    font-weight: 700;
    color: #ffffff;
    background-image: linear-gradient(90deg, 
        rgb(255, 167, 69), 
        rgb(254, 134, 159), 
        rgb(239, 122, 200), 
        rgb(160, 131, 237), 
        rgb(67, 174, 255), 
        rgb(160, 131, 237), 
        rgb(239, 122, 200), 
        rgb(254, 134, 159), 
        rgb(255, 167, 69));
    background-size: 200%;
    animation: streamer 2s linear infinite;
}

@keyframes streamer {
    0% {
        background-position: 0%;
    }
    100% {
        background-position: 200%;
    }
}

.shanchu {
    background: #e5e7eb;
    color: #374151;
}

.gengxin {
    background: #ede9fe;
    color: #5b21b6;
}

.archives {
    border-radius: 12px;
    padding: 32px;
    text-align: center;
    margin-top: 5px;
    animation: fadeInUp 0.6s ease-out 2.2s forwards;
    opacity: 0;
}

.archives h3 {
    color: #111827;
    margin-bottom: 20px;
    font-size: 20px;
    font-weight: 700;
}

.archive-links {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.archive-link {
    display: inline-block;
    padding: 12px 24px;
    background: #fff;
    color: #2563eb;
    text-decoration: none;
    border-radius: 8px;
    border: 1px solid #e5e7eb;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.2s;
}

.archive-link:hover {
    background: #2563eb;
    color: white;
    border-color: #2563eb;
    transform: translateY(-1px);
}

.footer {
    text-align: center;
    margin-top: 60px;
    padding: 30px 20px;
    border-top: 1px solid #e5e7eb;
    color: #6b7280;
    font-size: 13px;
}

.footer a {
    color: #2563eb;
    text-decoration: none;
    font-weight: 500;
}

.footer a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .container {
        padding: 20px 16px;
    }

    .header {
        margin-bottom: 40px;
        padding-bottom: 30px;
    }

    .header h1 {
        font-size: 26px;
    }

    .changelog::before {
        left: 16px;
    }

    .changelog-item {
        padding-left: 0;
    }

    .changelog-dot {
        left: 8px;
        width: 16px;
        height: 16px;
    }

    .changelog-card {
        padding: 20px;
    }

    .changelog-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .changelog-project {
        font-size: 16px;
    }

    .changelog-content {
        font-size: 14px;
    }

    .archives {
        padding: 24px 16px;
    }

    .archive-links {
        flex-direction: column;
    }

    .archive-link {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 22px;
    }

    .header-btn {
        padding: 10px 20px;
        font-size: 13px;
    }

    .changelog-item {
        margin-bottom: 24px;
    }

    .changelog-card {
        padding: 16px;
    }
}

.emoji {
    font-size: 22px;
}