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

body {
    font-family: "Microsoft YaHei", sans-serif;
    text-align: center;
}

/* 首页 P1 */
body.p1 {
    background: url('bg-p1.jpg') no-repeat center/cover;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
}

.title {
    font-size: 2.2rem;
    margin-bottom: 40px;
    text-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
}

.main-btn {
    background: linear-gradient(135deg, #FFD700, #FFB700);
    border: none;
    color: #333;
    padding: 15px 40px;
    font-size: 1.2rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
}

.main-btn:hover {
    transform: scale(1.08);
}

#paint-layer {
    position: fixed;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: url('paint-texture.png') repeat-x center/cover, #FFD700;
    z-index: 100;
    transition: left 2s ease-in-out;
}