/* 配色方案C：Playful Pastel */
:root {
    --primary-color: #5BC0EB;      /* Sky Blue */
    --secondary-color: #9BC53D;    /* Fresh Green */
    --accent-color: #FDE74C;       /* Sunny Yellow */
    --background-color: #FAFBFD;   /* Off White */
    --text-color: #1F2A44;         /* Deep Navy */
    --white: #FFFFFF;
    --light-gray: #E9EEF5;         /* Neutral light */
    --border-color: #C8D3E1;       /* Neutral border */
    --shadow-color-rgb: 91, 192, 235; /* primary as RGB for shadows */
}

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

body {
    font-family: 'Nunito', 'Inter', 'Segoe UI', Roboto, system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(var(--shadow-color-rgb), 0.14);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 2rem;
    font-weight: bold;
}

.nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s ease;
}

.nav a:hover,
.nav a.active {
    opacity: 0.8;
    text-decoration: underline;
}

/* 主要内容区域 */
.main {
    padding: 2rem 0;
}

/* 游戏区域样式 */
.game-section {
    margin-bottom: 3rem;
}

.game-container {
    background: var(--white);
    border-radius: 12px;
    padding: 1rem;
    box-shadow: 0 4px 20px rgba(var(--shadow-color-rgb), 0.12);
    border: 2px solid var(--accent-color);
}

#gamePlayer {
    width: 100%;
    height: 600px;
    border: none;
    border-radius: 8px;
}

/* 标签页区域样式 */
.info-section {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(var(--shadow-color-rgb), 0.12);
}

.tabs-header {
    display: flex;
    background: var(--light-gray);
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    padding: 1rem 2rem;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-color);
    transition: all 0.3s ease;
    position: relative;
}

.tab-btn:hover {
    background: var(--background-color);
}

.tab-btn.active {
    background: var(--primary-color);
    color: var(--white);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-color);
}

.tabs-content {
    padding: 2rem;
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.tab-panel h3 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.tab-panel p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

/* 步骤列表样式 */
.steps-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.step {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem;
    background: #F4F8FC; /* 淡化的浅底，提高层次感 */
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.step-number {
    background: var(--secondary-color);
    color: var(--white);
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    flex-shrink: 0;
}

.step-content h4 {
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

/* 特色列表样式 */
.features-list {
    list-style: none;
    display: grid;
    gap: 1rem;
}

.features-list li {
    padding: 1rem;
    background: var(--background-color);
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
    position: relative;
}

.features-list li::before {
    content: '✓';
    color: var(--secondary-color);
    font-weight: bold;
    margin-right: 0.5rem;
}

/* 底部样式 */
.footer {
    background: var(--text-color);
    color: var(--white);
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav ul {
        gap: 1rem;
    }
    
    .tabs-header {
        flex-direction: column;
    }
    
    .tab-btn {
        text-align: left;
    }
    
    #gamePlayer {
        height: 400px;
    }
    
    .step {
        flex-direction: column;
        text-align: center;
    }
}
/* 游
戏亮点样式 */
.game-highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.highlight-item {
    background: var(--background-color);
    padding: 1.5rem;
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.highlight-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(var(--shadow-color-rgb), 0.16);
}

.highlight-item h4 {
    color: var(--secondary-color);
    margin-bottom: 0.8rem;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.highlight-item p {
    color: var(--text-color);
    line-height: 1.6;
    margin: 0;
}

/* About页面内容卡片样式 */
.content-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(var(--shadow-color-rgb), 0.12);
    border: 1px solid var(--border-color);
}

.content-card h2 {
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
    font-size: 2rem;
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

.content-card h3 {
    color: var(--primary-color);
    margin: 2rem 0 1rem 0;
    font-size: 1.3rem;
}

.content-card ul {
    list-style: none;
    padding-left: 0;
}

.content-card ul li {
    padding: 0.8rem 0;
    border-bottom: 1px solid var(--border-color);
    position: relative;
    padding-left: 2rem;
}

.content-card ul li:last-child {
    border-bottom: none;
}

.content-card ul li::before {
    content: '▶';
    color: var(--primary-color);
    font-weight: bold;
    position: absolute;
    left: 0;
    top: 0.8rem;
}

/* Contact页面样式 */
.contact-info {
    display: grid;
    gap: 2rem;
    margin: 2rem 0;
}

.contact-item {
    background: var(--background-color);
    padding: 2rem;
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
}

.contact-item h3 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.contact-item p {
    line-height: 1.7;
    margin: 0;
}

.contact-item a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.contact-item a:hover {
    text-decoration: underline;
}

.note {
    background: #FEF3C7;
    border: 1px solid #F59E0B;
    border-radius: 8px;
    padding: 1.5rem;
    margin-top: 2rem;
}

.note p {
    margin: 0;
    color: #92400E;
}

/* 增强的响应式设计 */
@media (max-width: 768px) {
    .game-highlights {
        grid-template-columns: 1fr;
    }
    
    .highlight-item {
        padding: 1rem;
    }
    
    .content-card {
        padding: 1.5rem;
    }
    
    .content-card h2 {
        font-size: 1.5rem;
    }
    
    .contact-item {
        padding: 1.5rem;
    }
}

/* 加载动画优化 */
@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.step {
    animation: slideInUp 0.6s ease forwards;
}

.step:nth-child(1) { animation-delay: 0.1s; }
.step:nth-child(2) { animation-delay: 0.2s; }
.step:nth-child(3) { animation-delay: 0.3s; }
.step:nth-child(4) { animation-delay: 0.4s; }
.step:nth-child(5) { animation-delay: 0.5s; }
.step:nth-child(6) { animation-delay: 0.6s; }
.step:nth-child(7) { animation-delay: 0.7s; }
.step:nth-child(8) { animation-delay: 0.8s; }
.step:nth-child(9) { animation-delay: 0.9s; }

/* 游戏iframe加载状态 */
.game-container::before {
    content: 'Loading Game...';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--accent-color);
    font-size: 1.2rem;
    font-weight: 500;
    z-index: 1;
}

.game-container {
    position: relative;
}

#gamePlayer {
    position: relative;
    z-index: 2;
}/*
 性能优化 */
/* 预加载关键资源 */
.game-container {
    contain: layout style paint;
}

/* 优化字体加载 */
body {
    font-display: swap;
}

/* 减少重绘和回流 */
.tab-btn, .highlight-item, .step {
    will-change: transform;
}

.tab-btn:hover, .highlight-item:hover {
    will-change: auto;
}

/* 优化滚动性能 */
* {
    scroll-behavior: smooth;
}

/* 图片懒加载准备 */
img {
    loading: lazy;
}

/* 减少动画在低性能设备上的影响 */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 打印样式优化 */
@media print {
    .header, .footer, .tabs-header {
        display: none;
    }
    
    .tab-panel {
        display: block !important;
    }
    
    body {
        background: white;
        color: black;
    }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #008B8B;
        --accent-color: #4B0082;
        --text-color: #000000;
        --background-color: #FFFFFF;
    }
}

/* 深色模式准备 */
@media (prefers-color-scheme: dark) {
    :root {
        --background-color: #1a1a1a;
        --white: #2d2d2d;
        --text-color: #e5e5e5;
        --light-gray: #333333;
        --border-color: #444444;
    }
    
    .game-container {
        background: var(--white);
        border-color: var(--accent-color);
    }
}