/* ============================================
   个人主页 - 样式文件
   ============================================ */

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

:root {
    --primary: #6366F1;
    --primary-dark: #4F46E5;
    --primary-light: #818CF8;
    --secondary: #8B5CF6;
    --accent: #06B6D4;
    
    --bg: #F8FAFC;
    --surface: #FFFFFF;
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --text-light: #94A3B8;
    --border: #E2E8F0;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   导航栏
   ============================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 16px;
    padding-bottom: 16px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 20px;
}

.logo-icon {
    font-size: 28px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-link {
    padding: 10px 20px;
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    border-radius: var(--radius);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
    background: var(--primary-light);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* ============================================
   Hero 区域
   ============================================ */

.hero {
    position: relative;
    padding: 180px 0 120px;
    overflow: hidden;
    margin-top: 72px;
    text-align: center;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, 
        rgba(99, 102, 241, 0.1) 0%, 
        rgba(139, 92, 246, 0.05) 100%);
    z-index: -1;
}

.avatar {
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 32px;
    box-shadow: var(--shadow-xl);
}

.avatar-text {
    font-size: 48px;
    font-weight: 700;
    color: white;
}

.hero-title {
    font-size: clamp(36px, 6vw, 56px);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: clamp(16px, 2vw, 20px);
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.social-links {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: var(--transition);
}

.social-link:hover {
    border-color: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-lg);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: var(--surface);
    color: var(--primary);
    border-color: var(--primary-light);
}

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

.btn-outline {
    background: transparent;
    color: white;
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
}

.btn-lg {
    padding: 16px 32px;
    font-size: 18px;
}

/* ============================================
   通用区块样式
   ============================================ */

section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary-light);
    color: var(--primary-dark);
    font-size: 14px;
    font-weight: 600;
    border-radius: 100px;
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(32px, 4vw, 44px);
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.section-title.white {
    color: white;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   关于我
   ============================================ */

.about {
    background: var(--surface);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-text p {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.skills {
    margin-top: 48px;
}

.skills-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.skill-tag {
    padding: 8px 20px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    transition: var(--transition);
}

.skill-tag:hover {
    border-color: var(--primary-light);
    background: var(--primary-light);
    color: var(--primary-dark);
}

/* ============================================
   项目
   ============================================ */

.projects {
    background: var(--bg);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.project-card {
    background: var(--surface);
    padding: 32px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.project-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.project-icon span {
    font-size: 32px;
}

.project-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.project-desc {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.project-tags {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
}

.tag {
    padding: 4px 12px;
    background: var(--bg);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
}

.project-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: var(--transition);
}

.project-link:hover {
    gap: 8px;
}

/* ============================================
   联系
   ============================================ */

.contact {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.contact::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
}

.contact-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact-desc {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 40px;
    line-height: 1.8;
}

.contact-methods {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.contact-method {
    display: flex;
    align-items: center;
    gap: 16px;
    text-align: left;
}

.contact-icon {
    font-size: 32px;
}

.contact-label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 4px;
}

.contact-value {
    font-size: 18px;
    font-weight: 600;
}

/* ============================================
   页脚
   ============================================ */

.footer {
    background: var(--text-primary);
    color: rgba(255, 255, 255, 0.8);
    padding: 80px 0 32px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 60px;
    margin-bottom: 48px;
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: white;
    margin-bottom: 16px;
}

.footer-desc {
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.8;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.footer-title {
    color: white;
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 20px;
}

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

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
}

/* ============================================
   返回顶部按钮
   ============================================ */

.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 56px;
    height: 56px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

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

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-4px);
}

/* ============================================
   响应式设计
   ============================================ */

@media (max-width: 968px) {
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero {
        padding: 140px 0 80px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .contact-methods {
        flex-direction: column;
        align-items: center;
    }
}