/* 颜色变量定义 */
:root {
    /* 三种基本颜色 */
    --color-primary-dark: #3dbbff;
    --color-primary-light: #d3ecff;
    --color-text: #222222; /* aliceblue */
    
    --href-color: color-mix(in srgb, var(--color-text) 70%, var(--color-primary-light) 30%);

    /* 通过线性插值得到的颜色 */
    /* --color-highlight: 介于primary-light和text之间 (60% primary-light, 40% text) */
    --color-highlight: color-mix(in srgb, var(--color-primary-light) 60%, var(--color-text) 40%);
    
    /* --color-accent-dark: 介于primary-dark和primary-light之间 (70% primary-dark, 30% primary-light) */
    --color-accent-dark: color-mix(in srgb, var(--color-primary-dark) 70%, var(--color-primary-light) 30%);
    
    /* --color-light-cyan: 非常接近text，稍微偏青 (95% text, 5% primary-light) */
    --color-light-cyan: color-mix(in srgb, var(--color-text) 95%, var(--color-primary-light) 5%);
    
    /* 派生颜色 - 基于基本颜色运算 */
    --color-bg-gradient-start: var(--color-primary-dark);
    --color-bg-gradient-end: var(--color-primary-light);
    
    /* 边框颜色：基于text颜色调整透明度 */
    --color-border-light: color-mix(in srgb, var(--color-text) 20%, transparent 80%);
    --color-border-medium: color-mix(in srgb, var(--color-text) 70%, transparent 30%);
    
    /* 白色边框：基于text颜色与白色混合 */
    --color-border-white-light: color-mix(in srgb, white 20%, transparent 80%);
    --color-border-white-medium: color-mix(in srgb, white 40%, transparent 60%);
    
    /* 块背景颜色：基于light-cyan调整透明度 */
    --color-block-bg-light: color-mix(in srgb, var(--color-light-cyan) 10%, transparent 90%);
    --color-block-bg-medium: color-mix(in srgb, var(--color-light-cyan) 15%, transparent 85%);
    
    /* 块渐变颜色 */
    --color-block-gradient-start: var(--color-highlight);
    --color-block-gradient-end: var(--color-accent-dark);
    
    /* 阴影颜色 */
    --color-shadow-light: rgba(0, 0, 0, 0.2);
    --color-shadow-medium: rgba(0, 0, 0, 0.3);
}

* {
    box-sizing: border-box;
}

a {
    color: var(--href-color);
}

body {
    display: flex;
    min-height: 100vh;
    flex-direction: column;
    justify-content: space-between;
    background: linear-gradient(to bottom, var(--color-bg-gradient-start), 60%, var(--color-bg-gradient-end));
    padding-left: 2%;
    padding-right: 2%;
    font-family: 'Maple Mono NF CN', monospace;
    color: var(--color-text);
    overflow-x: hidden;
    /* 全局启用连字 */
    font-feature-settings: "liga" 1, "clig" 1, "dlig" 1;
    font-variant-ligatures: common-ligatures contextual discretionary-ligatures;
}

.TopBar {
    background-color: transparent;
    margin-top: 2%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-border-light);
    margin-bottom: 2rem;
}

.MainTitle {
    font-family: 'Maple Mono NF CN';
    font-size: clamp(1.8rem, 5vw, 3rem);
    color: var(--color-text);
    font-style: italic;
    font-weight: 700;
    text-align: center;
    text-shadow: 0 2px 10px var(--color-shadow-medium);
    letter-spacing: 1px;
    padding: 0.5rem 1.5rem;
    border-left: 3px solid var(--color-border-medium);
    border-right: 3px solid var(--color-border-medium);
    border-radius: 4px;
    /* 启用连字 */
    font-feature-settings: "liga" 1, "clig" 1, "dlig" 1;
    font-variant-ligatures: common-ligatures contextual discretionary-ligatures;
}

.Center {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 3vw;
    margin-bottom: 2rem;
}

.Block {
    margin: 0;
    width: min(300px, 25vw);
    height: min(300px, 25vw);
    background: var(--color-block-bg-light);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    border: 1px solid var(--color-border-white-light);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px var(--color-shadow-light);
}

.Block::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(to right, var(--color-block-gradient-start), var(--color-block-gradient-end));
}

.Block:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px var(--color-shadow-medium);
    background: var(--color-block-bg-medium);
    border-color: var(--color-border-white-medium);
}

.Block p {
    font-size: 1.2rem;
    font-weight: 600;
    text-align: center;
    padding: 1rem;
    z-index: 1;
    transition: transform 0.3s ease;
}

.Block:hover p {
    transform: scale(1.05);
}

.BottomBar {
    height: 8%;
    background-color: transparent;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1rem 0;
    border-top: 1px solid var(--color-border-light);
    margin-top: auto;
    font-weight: 600;
    letter-spacing: 1px;
    text-shadow: 0 1px 5px var(--color-shadow-medium);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .Center {
        flex-direction: column;
        gap: 2rem;
    }
    
    .Block {
        width: min(250px, 80vw);
        height: min(250px, 80vw);
    }
    
    body {
        padding-left: 5%;
        padding-right: 5%;
    }
}

/* 加载动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.TopBar, .Center, .BottomBar {
    animation: fadeInUp 0.8s ease-out;
}

.Block:nth-child(2) {
    animation-delay: 0.2s;
}