/* --- CSS 样式部分 --- */
:root {
    --bg-dark: #020617;
    --bg-light: #1e293b;
    --text-color: #f8fafc;
    --accent-cyan: #22d3ee;
    --accent-purple: #c084fc;
}

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

body {
    font-family: 'Montserrat', sans-serif;
    background-color: var(--bg-dark);
    /* 径向渐变背景，营造深邃感 */
    background-image: radial-gradient(circle at center, #1e293b 0%, #020617 100%);
    color: var(--text-color);
    height: 100vh;
    width: 100vw;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    position: relative;
}

/* 画布背景 */
#canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

/* 主体容器 */
.container {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: 20px;
    /* 稍微的入场动画 */
    opacity: 0;
    animation: fadeIn 1.5s ease-out forwards 0.5s;
}

.logo {
    font-size: 6rem;
    font-weight: 800;
    letter-spacing: -4px;
    line-height: 1;
    margin-bottom: 15px;
    /* 更高级的金属/流光质感 */
    background: linear-gradient(
        135deg, 
        #fff 0%, 
        var(--text-color) 40%, 
        var(--accent-cyan) 100%
    );
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 20px rgba(34, 211, 238, 0.2));
}

.tagline {
    font-family: 'Noto Serif SC', serif; /* 中文使用衬线体 */
    color: rgba(255, 255, 255, 0.6);
    font-size: 1.1rem;
    font-weight: 300;
    letter-spacing: 1.2em; /* 极致的字间距 */
    text-indent: 1.2em; /* 修正居中视觉 */
    text-transform: uppercase;
    position: relative;
}

/* 装饰线 */
.divider {
    width: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    margin: 30px auto;
    animation: expand 1.5s ease-out forwards 1s;
}

/* 底部社交栏 */
.social-links {
    position: absolute;
    bottom: 60px;
    z-index: 10;
    display: flex;
    gap: 30px;
    opacity: 0;
    transform: translateY(20px);
    animation: slideUp 1s ease forwards 1.5s;
}

.social-links a {
    color: rgba(255, 255, 255, 0.4);
    font-size: 1.5rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid transparent;
}

.social-links a:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.1);
}

/* 动画关键帧 */
@keyframes fadeIn {
    to { opacity: 1; }
}

@keyframes expand {
    to { width: 120px; }
}

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

/* 响应式调整 */
@media (max-width: 600px) {
    .logo { font-size: 3.8rem; letter-spacing: -2px; }
    .tagline { font-size: 0.9rem; letter-spacing: 0.8em; text-indent: 0.8em; }
    .social-links { bottom: 40px; gap: 20px; }
}