/* 核心变量 */
:root {
    --bg-color: #0f0f13;
    --text-color: #e0e0e0;
    --text-muted: #a0a0a0;
    --primary-color: #6366f1;
    --secondary-color: #ec4899;
    --accent-color: #8b5cf6;
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-cn: 'Noto Sans SC', sans-serif;
    --container-width: 1200px;
    --header-height: 80px;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-cn);
    font-weight: 700;
    color: #fff;
    line-height: 1.2;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

ul {
    list-style: none;
}

/* 布局辅助类 */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 100px 0;
}

/* 背景渐变层 */
.background-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 15% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(236, 72, 153, 0.15) 0%, transparent 25%);
    z-index: -1;
    pointer-events: none;
}

/* 页头 */
.site-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(15, 15, 19, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--card-border);
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.logo .highlight {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-muted);
}

.nav-links a:hover {
    color: #fff;
}

/* 主视觉区域 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: var(--header-height);
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 600px;
}

.hero-title {
    font-size: 4rem;
    margin-bottom: 20px;
}

.text-gradient {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 40px;
    max-width: 480px;
}

.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
}

.btn-sm {
    padding: 8px 20px;
    font-size: 0.9rem;
    background: #fff;
    color: #000;
}

/* 主视觉装饰图形 */
.hero-visual {
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    z-index: 1;
    overflow: hidden;
}

.shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.6;
}

.shape-1 {
    width: 400px;
    height: 400px;
    background: var(--primary-color);
    top: 20%;
    right: 10%;
    animation: float 10s infinite ease-in-out;
}

.shape-2 {
    width: 300px;
    height: 300px;
    background: var(--secondary-color);
    bottom: 20%;
    right: 20%;
    animation: float 14s infinite ease-in-out reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(-20px, 30px); }
}

/* 分区标题 */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.section-desc {
    color: var(--text-muted);
    font-size: 1.1rem;
}

/* 网格布局 */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

/* 卡片 */
.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    overflow: hidden;
    transition: transform 0.3s ease, border-color 0.3s ease;
    backdrop-filter: blur(10px);
}

.card:hover {
    transform: translateY(-10px);
    border-color: rgba(255, 255, 255, 0.2);
}

.card-image {
    height: 200px;
    width: 100%;
    background-size: cover;
    background-position: center;
}
.card-image-earth {
    background-image: url('../images/首页图片/全球人口.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.game-image-neon {
    background-image: url('../games/images/躲避障碍.png');
    background-size: cover;
    background-position: center;
}

.placeholder-gradient-1 { background: linear-gradient(45deg, #2c3e50, #3498db); }
.placeholder-gradient-2 { background: linear-gradient(45deg, #232526, #414345); }
.placeholder-gradient-3 { background: linear-gradient(45deg, #141E30, #243B55); }
.placeholder-game-1 { background: linear-gradient(135deg, #a8ff78, #78ffd6); }
.placeholder-game-2 { background: linear-gradient(135deg, #fdfbfb, #ebedee); }
.placeholder-game-3 { background: linear-gradient(135deg, #e65c00, #F9D423); }

.card-content {
    padding: 25px;
}

.card h3 {
    font-size: 1.25rem;
    margin-bottom: 10px;
}

.card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 20px;
}

.tag {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    font-size: 0.8rem;
    color: #fff;
}

.card-icon {
    font-size: 3rem;
    padding: 25px 25px 0 25px;
}

.card-link {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.9rem;
}

.card-link:hover {
    text-decoration: underline;
}

/* 游戏卡片专用样式 */
.game-card {
    position: relative;
}

.card-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 200px; /* 与图片高度一致 */
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.game-card:hover .card-overlay {
    opacity: 1;
}

/* 页脚 */
.site-footer {
    padding: 40px 0;
    text-align: center;
    color: var(--text-muted);
    border-top: 1px solid var(--card-border);
    margin-top: 60px;
}

/* 响应式处理 */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .nav-links {
        display: none; /* 暂时在移动端隐藏 */
    }
}