:root {
    /* 主题色彩：深邃紫色与亮蓝色搭配 */
    --primary: #8b5cf6;
    --primary-hover: #7c3aed;
    --secondary: #3b82f6;
    --background: #0f172a;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    
    /* 毛玻璃效果变量 */
    --glass-bg: rgba(30, 41, 59, 0.4);
    --glass-border: rgba(255, 255, 255, 0.08);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: var(--text-main);
    background-color: var(--background);
    overflow-x: hidden;
    line-height: 1.6;
    scroll-behavior: smooth;
}

/* 动态发光球体背景，增加呼吸感 */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: radial-gradient(circle at center, #1e1b4b 0%, var(--background) 100%);
    z-index: -2;
}

.glow-orb {
    position: fixed;
    border-radius: 50%;
    filter: blur(100px);
    z-index: -1;
    opacity: 0.5;
    animation: float 20s infinite ease-in-out alternate;
}

.orb-1 {
    width: 400px;
    height: 400px;
    background: var(--primary);
    top: -100px;
    left: -100px;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: var(--secondary);
    bottom: -150px;
    right: -100px;
    animation-delay: -5s;
    opacity: 0.3;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(100px, 50px) scale(1.1); }
    100% { transform: translate(-50px, 150px) scale(0.9); }
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 顶部导航 */
header {
    padding: 40px 0;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #a855f7, #3b82f6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    cursor: pointer;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 40px;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    position: relative;
}

.nav-links a:hover {
    color: var(--text-main);
}

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

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

/* 页面主要区块 */
.section {
    min-height: 75vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 40px 0;
}

/* 高级感毛玻璃卡片 */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 60px;
    max-width: 700px;
    box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.5);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.4s ease;
}

.glass-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 50px -10px rgba(0, 0, 0, 0.6);
}

h1 {
    font-size: 3.5rem;
    margin-bottom: 24px;
    font-weight: 700;
    letter-spacing: -1px;
    line-height: 1.1;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 24px;
    font-weight: 600;
    color: #e2e8f0;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 40px;
    line-height: 1.8;
}

.text-content {
    font-size: 1.1rem;
    color: var(--text-muted);
    line-height: 1.8;
}

/* 渐变按钮 */
.cta-button {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border: none;
    padding: 16px 40px;
    font-size: 1.05rem;
    font-weight: 600;
    border-radius: 40px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
}

.cta-button:hover {
    transform: scale(1.05) translateY(-2px);
    box-shadow: 0 8px 25px rgba(139, 92, 246, 0.5);
}

/* 项目网格 */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.project-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    padding: 30px;
    border-radius: 16px;
    text-align: center;
    color: var(--text-muted);
    transition: background 0.3s ease;
}

.project-item:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-main);
}

/* 交互辅助类 */
.hidden {
    display: none !important;
}

.fade-in {
    animation: slideUpFade 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes slideUpFade {
    0% { 
        opacity: 0; 
        transform: translateY(30px); 
    }
    100% { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

/* 响应式适配 */
@media (max-width: 768px) {
    .nav-links {
        display: none; /* 移动端可以考虑做个汉堡菜单，这里为了简洁先隐藏 */
    }
    
    h1 { font-size: 2.5rem; }
    .glass-card { padding: 40px 24px; }
}