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

body {
    font-family: 'Hiragino Kaku Gothic Pro', 'メイリオ', sans-serif;
    background-color: #f0f8ff;
    min-height: 100vh;
}

.container {
    max-width: 800px;
    width: 90%;
    padding: 20px;
    background-color: white;
    border-radius: 15px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    margin: 60px auto 0 auto;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
}

.game-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.image-container {
    width: 100%;
    max-width: 500px;
    height: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #f5f5f5;
    border-radius: 10px;
    overflow: hidden;
}

#seasonImage {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.options {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.option-btn {
    padding: 10px 20px;
    font-size: 16px;
    border: none;
    border-radius: 5px;
    background-color: #4CAF50;
    color: white;
    cursor: pointer;
    transition: background-color 0.3s;
}

.option-btn:hover {
    background-color: #45a049;
}

#showAnswer {
    background-color: #2196F3;
}

#showAnswer:hover {
    background-color: #1976D2;
}

.result {
    margin-top: 20px;
    padding: 10px;
    border-radius: 5px;
    text-align: center;
    min-height: 40px;
}

.correct {
    background-color: #dff0d8;
    color: #3c763d;
}

.incorrect {
    background-color: #f2dede;
    color: #a94442;
}

/* Header 样式 */
.main-header {
    width: 100%;
    background: #a60000;
    padding: 0 0 0 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.nav-list {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0 20px;
    height: 56px;
    align-items: center;
}
.nav-list li {
    margin-right: 24px;
}
.nav-list li:last-child {
    margin-right: 0;
}
.nav-list a {
    color: #fff;
    text-decoration: none;
    font-size: 18px;
    font-weight: bold;
    padding: 8px 12px;
    border-radius: 4px;
    transition: background 0.2s;
}
.nav-list a:hover {
    background: #7a0000;
}

@media (max-width: 600px) {
    .nav-list {
        overflow-x: auto;
        white-space: nowrap;
        padding: 0 5px;
        height: 48px;
    }
    .nav-list li {
        display: inline-block;
        margin-right: 12px;
    }
    .nav-list a {
        font-size: 15px;
        padding: 6px 8px;
    }
}

/* 让首页图片完整显示 */
.fullscreen-bg img {
    width: 100vw;
    height: 100vh;
    object-fit: contain !important;
    object-position: center;
    display: block;
    background: #a60000;
}