/* 通用样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    overflow: hidden;
    height: 100%;
    width: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    height: 100vh;
    width: 100vw;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f5f5f5;
    overflow: hidden;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    -webkit-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
}

/* 简洁的背景装饰 */
body::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(255, 59, 48, 0.05) 0%, transparent 70%);
    animation: bgFloat 20s ease-in-out infinite;
    z-index: 0;
    pointer-events: none;
}

@keyframes bgFloat {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    50% {
        transform: translate(-20px, 20px) scale(1.1);
    }
}

/* 背景装饰圆圈 */
.bg-circle {
    position: absolute;
    border-radius: 50%;
    z-index: 0;
    pointer-events: none;
}

.circle1 {
    width: 300px;
    height: 300px;
    top: -100px;
    left: -100px;
    background: radial-gradient(circle, rgba(255, 59, 48, 0.08) 0%, transparent 70%);
    animation: float1 15s ease-in-out infinite;
}

.circle2 {
    width: 250px;
    height: 250px;
    bottom: -80px;
    right: -80px;
    background: radial-gradient(circle, rgba(255, 59, 48, 0.06) 0%, transparent 70%);
    animation: float2 18s ease-in-out infinite;
}

@keyframes float1 {
    0%, 100% {
        transform: translate(0, 0);
        opacity: 0.6;
    }
    50% {
        transform: translate(30px, 30px);
        opacity: 0.8;
    }
}

@keyframes float2 {
    0%, 100% {
        transform: translate(0, 0);
        opacity: 0.6;
    }
    50% {
        transform: translate(-30px, -30px);
        opacity: 0.8;
    }
}

/* 粒子效果容器 */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 0;
    pointer-events: none;
}

.particle {
    position: absolute;
    width: 3px;
    height: 3px;
    background: rgba(255, 68, 68, 0.3);
    border-radius: 50%;
    box-shadow: 0 0 8px rgba(255, 68, 68, 0.4);
    animation: particleFloat 20s linear infinite;
    pointer-events: none;
}

@keyframes particleFloat {
    0% {
        transform: translateY(100vh) translateX(0);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-100px) translateX(100px);
        opacity: 0;
    }
}