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

body {
    font-family: 'Be Vietnam Pro', sans-serif;
    min-height: 100vh;
    background: radial-gradient(circle at center, #061933 0%, #020914 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    position: relative;
    padding: 20px 10px;
}

/* Lưới không gian công nghệ Cyberpunk */
.cyber-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-image: 
        linear-gradient(rgba(0, 225, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 225, 255, 0.05) 1px, transparent 1px);
    background-size: 35px 35px;
    z-index: 0;
    pointer-events: none;
}

.background-glow {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 650px;
    height: 650px;
    background: radial-gradient(circle, rgba(0, 220, 255, 0.2) 0%, rgba(2, 9, 20, 0) 70%);
    z-index: 0;
    pointer-events: none;
}

.container {
    position: relative;
    z-index: 2;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
}

/* HIỆU ỨNG RƠI: MŨ TỐT NGHIỆP, SAO, CODE */
.falling-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    overflow: hidden;
    z-index: 1;
}

.falling-item {
    position: absolute;
    top: -50px;
    user-select: none;
    pointer-events: none;
    will-change: transform, opacity;
    animation: fallingAnimation linear forwards;
    filter: drop-shadow(0 0 8px rgba(0, 240, 255, 0.6));
}

@keyframes fallingAnimation {
    0% {
        transform: translateY(0) rotate(0deg) translateX(0);
        opacity: 0;
    }
    10% {
        opacity: 0.9;
    }
    90% {
        opacity: 0.8;
    }
    100% {
        transform: translateY(105vh) rotate(360deg) translateX(40px);
        opacity: 0;
    }
}