/* === 基础重置 === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Poppins, system-ui, -apple-system, sans-serif;
    background-color: #070709;
    color: white;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

/* === 背景层（动态多边形）=== */
.g-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -2;
    pointer-events: none;
    overflow: hidden;
}

.g-polygon {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.3;
    clip-path: polygon(50% 50%, 50% 50%, 50% 50%, 50% 50%);
    transition: clip-path 2s ease;
    backdrop-filter: blur(20px);
    will-change: transform;
}

.g-bg::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    backdrop-filter: blur(140px);
    z-index: 1;
}

/* === 主内容 === */
.main-content {
    position: absolute;
    left: 10%;
    top: 50%;
    transform: translateY(-50%);
    z-index: 2;
    text-align: left;
    max-width: 600px;
    padding: 2rem;
}

.smiley {
    font-size: 12rem;
    margin-bottom: 1rem;
    font-weight: bold;
    line-height: 1;
    font-family: 'Courier New', monospace;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

.intro h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.intro p {
    font-size: 1.2rem;
    opacity: 0.8;
    margin-bottom: 2rem;
}

.buttons {
    display: flex;
    flex-direction: row;
    gap: 1rem;
    align-items: center;
    justify-content: flex-start;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    text-decoration: none;
    border-radius: 25px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
    font-size: 1rem;
    font-weight: 500;
    min-width: 200px;
    text-align: center;
}

.btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

/* === 响应式设计 === */
@media (max-width: 768px) {
    .main-content {
        left: 5%;
        padding: 1rem;
        text-align: center;
    }

    .smiley {
        font-size: 8rem;
    }

    .intro h1 {
        font-size: 2rem;
    }

    .intro p {
        font-size: 1rem;
    }

    .buttons {
        flex-direction: column;
        gap: 0.75rem;
    }

    .btn {
        min-width: 180px;
        padding: 0.6rem 1.2rem;
    }
}