/* 自定义CSS变量 */
:root {
    --primary-50: #f0f9ff;
    --primary-100: #e0f2fe;
    --primary-200: #bae6fd;
    --primary-300: #7dd3fc;
    --primary-400: #38bdf8;
    --primary-500: #0ea5e9;
    --primary-600: #0284c7;
    --primary-700: #0369a1;
    --primary-800: #075985;
    --primary-900: #0c4a6e;
    
    --dark-50: #f8fafc;
    --dark-100: #f1f5f9;
    --dark-200: #e2e8f0;
    --dark-300: #cbd5e1;
    --dark-400: #94a3b8;
    --dark-500: #64748b;
    --dark-600: #475569;
    --dark-700: #334155;
    --dark-800: #1e293b;
    --dark-900: #0f172a;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    background: linear-gradient(135deg, var(--dark-900) 0%, var(--dark-800) 100%);
    color: white;
}

/* 游戏字体 */
.gaming-font {
    font-family: 'Orbitron', monospace;
}

/* 渐变文字 */
.text-gradient {
    background: linear-gradient(135deg, var(--primary-400) 0%, var(--primary-600) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 按钮样式 */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary-700) 100%);
    color: white;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(14, 165, 233, 0.3);
}

.btn-secondary {
    background: transparent;
    border: 2px solid var(--primary-500);
    color: var(--primary-400);
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.btn-secondary:hover {
    background: var(--primary-500);
    color: white;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* 导航样式 */
.nav-link {
    color: #d1d5db;
    text-decoration: none;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: var(--primary-400);
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background: var(--primary-400);
    transition: width 0.3s ease;
}

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

.mobile-nav-link {
    display: block;
    color: #d1d5db;
    text-decoration: none;
    padding: 0.75rem 1rem;
    transition: all 0.3s ease;
}

.mobile-nav-link:hover {
    color: var(--primary-400);
    background: rgba(14, 165, 233, 0.1);
}

/* 英雄区域 */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-title {
    font-size: 3rem;
    font-weight: 900;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #d1d5db;
    margin-bottom: 2rem;
    max-width: 48rem;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
    justify-content: center;
}

/* 浮动元素 */
.floating-elements {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}

.floating-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(40px);
    opacity: 0.6;
}

.orb-1 {
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, var(--primary-500) 0%, transparent 70%);
    top: 20%;
    left: 10%;
    animation: float 6s ease-in-out infinite;
}

.orb-2 {
    width: 150px;
    height: 150px;
    background: radial-gradient(circle, var(--primary-400) 0%, transparent 70%);
    top: 60%;
    right: 15%;
    animation: float 8s ease-in-out infinite reverse;
}

.orb-3 {
    width: 100px;
    height: 100px;
    background: radial-gradient(circle, var(--primary-600) 0%, transparent 70%);
    bottom: 20%;
    left: 50%;
    animation: float 10s ease-in-out infinite;
}

/* 区域标题 */
.section-title {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-400) 0%, var(--primary-600) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.25rem;
    color: #d1d5db;
    max-width: 32rem;
    margin: 0 auto;
}

/* 功能卡片 */
.feature-card {
    background: rgba(30, 41, 59, 0.5);
    backdrop-filter: blur(10px);
    border: 1px solid var(--dark-700);
    border-radius: 1rem;
    padding: 2rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: rgba(14, 165, 233, 0.5);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.feature-icon {
    color: var(--primary-400);
    margin-bottom: 1rem;
    transition: color 0.3s ease;
}

.feature-card:hover .feature-icon {
    color: var(--primary-300);
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: white;
}

.feature-description {
    color: #9ca3af;
}

/* 统计数据 */
.stat-item {
    padding: 1rem;
}

.stat-number {
    font-size: 3rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary-400) 0%, var(--primary-600) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    font-family: 'Orbitron', monospace;
}

.stat-label {
    color: #d1d5db;
    font-size: 1.125rem;
}

/* 下载卡片 */
.download-card {
    background: rgba(30, 41, 59, 0.5);
    backdrop-filter: blur(10px);
    border: 1px solid var(--dark-700);
    border-radius: 1rem;
    padding: 2rem;
    max-width: 28rem;
    margin: 0 auto;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #d1d5db;
}

/* 页脚 */
.footer-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: white;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: #9ca3af;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--primary-400);
}

.social-link {
    color: #9ca3af;
    transition: color 0.3s ease;
}

.social-link:hover {
    color: var(--primary-400);
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--primary-600);
    color: white;
    border: none;
    border-radius: 50%;
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
}

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

.back-to-top:hover {
    background: var(--primary-700);
    transform: translateY(-2px);
}

/* 动画 */
@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeInUp 0.8s ease-out;
}

/* 响应式设计 */
@media (min-width: 640px) {
    .hero-buttons {
        flex-direction: row;
    }
    
    .hero-title {
        font-size: 4rem;
    }
}

@media (min-width: 768px) {
    .hero-title {
        font-size: 5rem;
    }
    
    .section-title {
        font-size: 3rem;
    }
}

@media (min-width: 1024px) {
    .hero-title {
        font-size: 6rem;
    }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--dark-800);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-600);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-500);
}

/* 加载动画 */
.loading {
    width: 40px;
    height: 40px;
    border: 4px solid var(--dark-700);
    border-top: 4px solid var(--primary-500);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.fade-in-up {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

.fade-in-up.loaded {
    opacity: 1;
    transform: translateY(0);
}

/* 游戏卡片样式 */
.game-card {
    transition: all 0.3s ease;
}

.game-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

/* 文本截断 */
.line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}