/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --text-color: #1e293b;
    --text-light: #64748b;
    --bg-color: #ffffff;
    --bg-light: #f8fafc;
    --bg-dark: #0f172a;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    overflow-x: hidden;
}

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: var(--shadow-lg);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin: 0;
}

.nav-brand .subtitle {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-left: 0.5rem;
}

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

.nav-link {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-color);
    transition: var(--transition);
}

/* Hero 区域 */
.hero {
    margin-top: 80px;
    padding: 4rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

.hero-compatibility {
    margin-bottom: 2rem;
}

.compatibility-label {
    display: block;
    font-size: 0.875rem;
    opacity: 0.8;
    margin-bottom: 0.75rem;
}

.compatibility-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.compatibility-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.compatibility-badge:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.hero-requirements {
    font-size: 0.875rem;
    opacity: 0.85;
    margin-top: 0.5rem;
    line-height: 1.6;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-img {
    width: 100%;
    max-width: 800px;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    object-fit: contain;
    /* 初始状态（用于淡入动画） */
    opacity: 0;
    /* 动画过渡 */
    transition: opacity 0.6s ease-out, box-shadow 0.3s ease;
}

/* 图片加载完成后的淡入和浮动动画 */
.hero-img.loaded {
    opacity: 1;
    animation: heroFloat 6s ease-in-out infinite;
}

/* 淡入动画 */
@keyframes heroFadeIn {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* 浮动动画 */
@keyframes heroFloat {
    0%, 100% {
        transform: translateY(0px) scale(1);
    }
    50% {
        transform: translateY(-15px) scale(1);
    }
}

/* 悬停效果 - 覆盖浮动动画 */
.hero-img.loaded:hover {
    animation: none;
    transform: translateY(-10px) scale(1.02) !important;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

/* 图片容器添加光晕效果 */
.hero-image {
    position: relative;
}

.hero-image::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    max-width: 850px;
    height: 100%;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.2) 0%, transparent 70%);
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.6s ease;
    pointer-events: none;
    z-index: -1;
    animation: heroGlow 4s ease-in-out infinite;
}

@keyframes heroGlow {
    0%, 100% {
        opacity: 0.3;
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        opacity: 0.6;
        transform: translate(-50%, -50%) scale(1.1);
    }
}

.hero-image:hover::before {
    opacity: 0.8;
}

.hero-placeholder {
    width: 100%;
    max-width: 500px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 2rem;
}

.hero-placeholder svg {
    width: 100%;
    height: auto;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
}

.btn-download {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.125rem;
    padding: 1rem 2.5rem;
}

.download-icon {
    font-size: 1.25rem;
}

#downloadBtn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

/* 章节标题 */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-light);
}

/* 游戏引擎兼容性 */
.compatibility {
    padding: 4rem 0;
    background: white;
}

.compatibility-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.compatibility-item {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    border: 2px solid var(--border-color);
    transition: var(--transition);
}

.compatibility-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.compatibility-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.compatibility-item h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-color);
    font-weight: 700;
}

.compatibility-item p {
    color: var(--text-light);
    line-height: 1.8;
    font-size: 0.95rem;
}

/* 产品介绍 */
.intro {
    padding: 4rem 0;
    background: var(--bg-light);
}

.intro-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.intro-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.intro-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.intro-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.intro-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.intro-card p {
    color: var(--text-light);
    line-height: 1.8;
}

/* 功能特性 */
.features {
    padding: 4rem 0;
}

.features-list {
    display: flex;
    flex-direction: column;
    gap: 4rem;
}

.feature-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.feature-item.reverse {
    direction: rtl;
}

.feature-item.reverse > * {
    direction: ltr;
}

.feature-content h3 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.feature-content ul {
    list-style: none;
}

.feature-content li {
    padding: 0.75rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-light);
}

.feature-content li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.feature-image {
    background: var(--bg-light);
    border-radius: 10px;
    padding: 1rem;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.feature-img {
    width: 100%;
    max-width: 600px;
    height: auto;
    max-height: 400px;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.feature-img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
}

.image-placeholder {
    text-align: center;
    color: var(--text-light);
    font-size: 1.25rem;
}

/* 界面展示 */
.screenshots {
    padding: 4rem 0;
    background: var(--bg-light);
}

.screenshot-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.screenshot-item {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.screenshot-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.screenshot-placeholder {
    width: 100%;
    height: 200px;
    background: var(--bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 1.125rem;
}

.screenshot-item p {
    padding: 1rem;
    text-align: center;
    color: var(--text-color);
    font-weight: 500;
}

/* 下载区域 */
.download {
    padding: 4rem 0;
}

.download-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.download-info {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 10px;
}

.version-info {
    margin-bottom: 2rem;
}

.version-info h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.version-number {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.version-date {
    color: var(--text-light);
}

.download-requirements h4 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.download-requirements ul {
    list-style: none;
}

.download-requirements li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-light);
}

.download-requirements li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-size: 1.5rem;
    line-height: 1;
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* 联系区域 */
.contact {
    padding: 4rem 0;
    background: var(--bg-light);
}

.contact-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.contact-item {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    box-shadow: var(--shadow);
}

.contact-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.contact-item h4 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.contact-item p {
    color: var(--text-light);
}

/* 联系我们 */
.contact {
    padding: 4rem 0;
    background: var(--bg-light);
}

.contact-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.contact-card {
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.contact-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.contact-icon {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
}

.contact-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
    font-weight: 700;
}

.contact-card p {
    color: var(--text-light);
    font-size: 1.1rem;
    line-height: 1.8;
    margin: 0;
}

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

.contact-link:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* 页脚 */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: 2rem 0;
    text-align: center;
}

.footer p {
    margin: 0.5rem 0;
    font-size: 0.875rem;
    line-height: 1.8;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 0;
}

.footer-separator {
    margin: 0 0.5rem;
    color: rgba(255, 255, 255, 0.5);
}

.icp-link {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.875rem;
}

.icp-link:hover {
    color: white;
    text-decoration: underline;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: var(--shadow-lg);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-hover);
    transform: translateY(-5px);
}