:root {
    --primary-color: #00f2ff;
    --secondary-color: #7000ff;
    --accent-color: #ff00c8;
    --bg-color: #050505;
    --text-color: #ffffff;
    --gold-color: #ffd700;
    --green-color: #00ff41;
    --orange-color: #ff6b35;
    --purple-color: #9d4edd;
    --cyan-color: #00ffff;
    --pink-color: #ff006e;
}

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

body, html {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-color);
}

#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

.container {
    position: relative;
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    padding: 2rem;
    perspective: 1000px;
}

header {
    text-align: center;
    margin-top: 2rem;
    animation: fadeInDown 1s ease-out;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.brand {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-color);
    letter-spacing: 0.3rem;
    text-shadow: 0 0 15px rgba(255, 255, 255, 0.5);
}

.subtitle {
    font-size: 0.9rem;
    letter-spacing: 0.2rem;
    color: var(--primary-color);
    text-transform: uppercase;
    text-shadow: 0 0 10px var(--primary-color);
    opacity: 0.8;
}

main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    transform-style: preserve-3d;
}

.main-title {
    font-size: 5rem;
    font-weight: 900;
    text-transform: uppercase;
    position: relative;
    color: #fff;
    letter-spacing: 0.2rem;
    transform: rotateX(20deg) rotateY(-10deg);
    animation: titleFloat 6s ease-in-out infinite;
    will-change: transform;
    text-shadow: 
        0 1px 0 #ccc,
        0 2px 0 #c9c9c9,
        0 3px 0 #bbb,
        0 4px 0 #b9b9b9,
        0 5px 0 #aaa,
        0 6px 1px rgba(0,0,0,.1),
        0 0 5px rgba(0,0,0,.1),
        0 1px 3px rgba(0,0,0,.3),
        0 3px 5px rgba(0,0,0,.2),
        0 5px 10px rgba(0,0,0,.25),
        0 10px 10px rgba(0,0,0,.2),
        0 20px 20px rgba(0,0,0,.15),
        0 0 20px var(--primary-color),
        0 0 40px var(--secondary-color);
}

.main-title::before {
    content: attr(data-text);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    color: var(--accent-color);
    z-index: -1;
    filter: blur(8px);
    opacity: 0.5;
    animation: glitch 4s infinite;
}

footer {
    width: 100%;
    text-align: center;
    padding: 1.5rem 0;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.5);
    animation: fadeInUp 1s ease-out;
}

footer span.placeholder {
    color: rgba(255, 255, 255, 0.7);
}

@keyframes titleFloat {
    0% {
        transform: rotateX(15deg) rotateY(-15deg) translate3d(0, 0, 0) rotateZ(-2deg);
    }
    33% {
        transform: rotateX(25deg) rotateY(10deg) translate3d(15px, -30px, 20px) rotateZ(1deg);
    }
    66% {
        transform: rotateX(20deg) rotateY(20deg) translate3d(-15px, -50px, 40px) rotateZ(3deg);
    }
    100% {
        transform: rotateX(15deg) rotateY(-15deg) translate3d(0, 0, 0) rotateZ(-2deg);
    }
}

@keyframes glitch {
    0% { transform: translate(0); opacity: 0.5; }
    2% { transform: translate(-5px, 2px); opacity: 0.7; }
    4% { transform: translate(5px, -2px); opacity: 0.7; }
    6% { transform: translate(0); opacity: 0.5; }
    100% { transform: translate(0); opacity: 0.5; }
}

@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);
    }
}

/* ============ 移动端性能优化 ============ */

@media (max-width: 1024px) {
    /* 平板设备 */
    .brand {
        font-size: 1.2rem;
    }
    
    .subtitle {
        font-size: 0.8rem;
    }
    
    .main-title {
        font-size: 4rem;
        animation: titleFloat 3.6s ease-in-out infinite;
    }
}

@media (max-width: 768px) {
    /* 平板竖屏/小屏幕 */
    .container {
        padding: 1.5rem;
    }
    
    .brand {
        font-size: 1rem;
    }

    .subtitle {
        font-size: 0.7rem;
    }
    
    .main-title {
        font-size: 3rem;
        letter-spacing: 0.1rem;
        /* 简化阴影，减少性能负担 */
        text-shadow: 
            0 0 10px var(--primary-color),
            0 0 20px var(--secondary-color);
    }

    /* 简化3D动画以节省性能 */
    .main-title {
        animation: titleFloatMobile 4s ease-in-out infinite alternate !important;
    }

    /* 简化动画 */
    @keyframes titleFloatMobile {
        0% {
            transform: translate3d(0, 0, 0) rotateZ(-1.5deg);
        }
        100% {
            transform: translate3d(0, -25px, 0) rotateZ(1.5deg);
        }
    }

    /* 关闭will-change，防止过度优化 */
    * {
        will-change: auto;
    }
    
    footer {
        font-size: 0.7rem;
    }
}

@media (max-width: 480px) {
    /* 手机设备 */
    header {
        margin-top: 0.5rem;
    }

    .container {
        padding: 1rem;
        justify-content: flex-start;
        padding-top: 0.5rem;
    }

    .brand {
        font-size: 0.9rem;
        letter-spacing: 0.1rem;
    }

    .subtitle {
        font-size: 0.6rem;
        letter-spacing: 0.05rem;
    }

    main {
        flex: 0 0 auto;
        margin: auto 0;
    }

    .main-title {
        font-size: 2rem;
        letter-spacing: 0.05rem;
        /* 移动端简化阴影 */
        text-shadow: 
            0 0 10px var(--primary-color),
            0 0 15px var(--secondary-color);
    }

    footer {
        font-size: 0.65rem;
        padding: 0.5rem 0;
    }

    footer p {
        display: flex;
        flex-direction: column;
        gap: 0.3rem;
        line-height: 1.3;
    }
}

@media (max-width: 360px) {
    /* 超小屏幕 */
    .main-title {
        font-size: 1.5rem;
    }

    .brand {
        font-size: 0.8rem;
    }

    footer {
        font-size: 0.6rem;
    }

    .container {
        padding: 0.8rem;
    }
}

/* ============ 动画性能优化 ============ */

/* 减少在低配置设备上的动画复杂度 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 手机端关闭某些重型动画 */
@media (max-width: 768px) {
    .main-title::before {
        /* 简化blur效果 */
        filter: blur(4px);
    }
}