/* 通用样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Orbitron', sans-serif;
}

body {
    background: 
        radial-gradient(ellipse at top, #0a0e27, #010010),
        radial-gradient(ellipse at bottom, #0a0e27, #000000);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    position: relative;
    color: #e0f0ff;
}

/* 宇宙粒子背景 */
.cosmic-particles {
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.particle {
    position: absolute;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    opacity: 0;
    animation: twinkle 8s infinite ease-in-out;
}

/* 科技网格 */
.tech-grid {
    position: absolute;
    width: 100%;
    height: 100%;
    background: 
        linear-gradient(90deg, rgba(0, 200, 255, 0.08) 极光1px, transparent 1px),
        linear-gradient(rgba(0, 200, 255, 0.08) 1px, transparent 1px);
    background-size: 40px 40px;
    z-index: -1;
    opacity: 0.6;
}

/* 霓虹光线 */
.neon-beam {
    position: absolute;
    height: 2px;
    background: linear-gradient(90deg, transparent, #0ff, #ff0, transparent);
    filter: blur(1px);
    box-shadow: 0 0 10px #0ff, 0 0 20px #ff0;
    z-index: -1;
    animation: beamScan 12s linear infinite;
}

.container {
    width: 90%;
    max-width: 800px;
    padding: 20px;
    position: relative;
    z-index: 10;
    text-align: center;
    margin-top: -50px;
}

/* 主标题 - 荧光渐变效果 */
.main-title {
    font-size: 4.5rem;
    font-weight: 900;
    letter-spacing: 4px;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    background: linear-gradient(
        45deg,
        #ff0077,
        #ff3300,
        #ffaa00,
        #ffff00,
        #aaff00,
        #00ff88,
        #00ffff,
        #0088ff,
        #aa00ff,
        #ff0077
    );
    background-size: 500% 500%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 15s ease infinite, textGlow 3s ease-in-out infinite alternate;
    text-shadow: 0 0 5px rgba(255, 255, 255, 0.5);
    margin-top: 1rem;
}

/* 副标题 - 明亮渐变效果 */
.subtitle {
    font-size: 1.8rem;
    font-weight: 300;
    letter-spacing: 8px;
    margin-bottom: 2rem;
    text-transform: uppercase;
    background: linear-gradient(
        to right,
        #00ffff,
        #ff00ff,
        #ffff00
    );
    background-size: 300% 300%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 12s ease infinite, subtitleGlow 2s ease-in-out infinite alternate;
    position: relative;
    display: inline-block;
    padding: 10px 25px;
}

.subtitle::before {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    top: 50%;
    height: 1px;
    background: linear-gradient(to right, transparent, #0极光ff, #ff0, transparent);
    transform: translateY(-50%);
    z-index: -1;
}

.subtitle::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(to right, transparent, #ff0, #f0f, transparent);
    z-index: -1;
}

/* 底部信息条 - 固定在页面底部 */
.info-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 15px;
    text-align: center;
    color: rgba(150, 220, 255, 0.7);
    font-size: 0.9rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    display: flex;
    justify-content: center;
    gap: 30px;
    background: rgba(10, 15, 40, 0.7);
    backdrop-filter: blur(5px);
    border-top: 1px solid rgba(0, 150, 255, 0.3);
    z-index: 100;
}

.info-bar span {
    padding: 0 15px;
    position: relative;
}

.info-bar span::after {
    content: '';
    position: absolute;
    right: -15px;
    top: 50%;
    height: 12px;
    width: 1px;
    background: rgba(0, 200, 255, 0.5);
    transform: translateY(-50%);
}

.info-bar span:last-child::after {
    display: none;
}

/* 动画效果 */
@keyframes twinkle {
    0%, 100% { opacity: 0; transform: scale(0.5); }
    50% { opacity: 1; transform: scale(1.2); }
}

@keyframes beamScan {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes textGlow {
    0% { text-shadow: 0 0 5px rgba(255, 255, 255, 0.5), 0 0 20px rgba(0, 200, 255, 0.3); }
    100% { text-shadow: 0 0 15px rgba(255, 255, 255, 0.8), 0 0 40px rgba(0, 200, 255, 0.7), 0 0 80px rgba(100, 0, 255, 0.4); }
}

@keyframes subtitleGlow {
    0% { text-shadow: 0 0 5px rgba(255, 255, 255, 0.3); }
    100% { text-shadow: 0 0 15px rgba(0, 255, 255, 0.7), 0 0 30px rgba(255, 0, 255, 0.6); }
}