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

body {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: #ffffff;
    font-family: Arial, sans-serif;
    overflow: hidden;
}

.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 20px;
    padding: 20px;
    text-align: center;
}

.message {
    font-size: 20px;
    color: #333;
}

.btn {
    padding: 12px 24px;
    font-size: 16px;
    border: none;
    border-radius: 8px;
    background: #007bff;
    color: white;
    cursor: pointer;
}

.btn:active {
    transform: scale(0.95);
}

/* 伪加载 */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: #111;
    color: #fff;
    z-index: 15;
}

.progress-bar {
    width: 80%;
    height: 20px;
    background: #333;
    border-radius: 10px;
    overflow: hidden;
    margin-top: 20px;
}

.progress {
    height: 100%;
    width: 0%;
    background: #00ffcc;
    transition: width 0.2s;
}

.fade {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: black;
    opacity: 0;
    pointer-events: none;
    transition: opacity 1s linear;
    z-index: 20;
}

.fade.active {
    opacity: 1;
}

.image-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    justify-content: center;
    align-items: center;
    background: black;
    z-index: 30;
}

.image-screen img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}