/* ========================================
   个人主页样式表 - style.css
   作者：王跃桦
   版本：2.0 - Apple 工程师简历风格
   ======================================== */

/* CSS 变量定义 - Apple 风格配色 */
:root {
    /* 浅色主题 - Apple 风格 */
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f7;
    --bg-tertiary: #fbfbfd;
    --bg-card: #ffffff;
    
    /* 文字颜色 */
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --text-tertiary: #86868b;
    
    /* 分割线 */
    --divider: #d2d2d7;
    --divider-light: #e5e5e5;
    
    /* 强调色 - Apple 蓝 */
    --accent: #0071e3;
    --accent-hover: #0077ed;
    --accent-light: rgba(0, 113, 227, 0.06);
    
    /* 阴影 - 柔和克制 */
    --shadow-subtle: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.08);
    
    /* 间距 */
    --section-padding: 120px 20px;
    --container-width: 980px;
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

/* 深色模式 */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #000000;
        --bg-secondary: #1d1d1f;
        --bg-tertiary: #2d2d2f;
        --bg-card: #1d1d1f;
        
        --text-primary: #f5f5f7;
        --text-secondary: #a1a1a6;
        --text-tertiary: #86868b;
        
        --divider: #38383a;
        --divider-light: #2d2d2f;
        
        --accent: #2997ff;
        --accent-hover: #409cff;
        --accent-light: rgba(41, 151, 255, 0.12);
        
        --shadow-subtle: 0 2px 8px rgba(0, 0, 0, 0.3);
        --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.4);
        --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.5);
    }
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 60px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", "Noto Sans SC", sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* 通用标题样式 */
.section-title {
    font-size: 2.5rem;
    font-weight: 600;
    text-align: center;
    letter-spacing: -0.02em;
    margin-bottom: 60px;
    color: var(--text-primary);
}

/* ========================================
   导航栏 - Apple 风格
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--bg-primary);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--divider-light);
    transition: var(--transition-normal);
}

.navbar.scrolled {
    background: var(--bg-primary);
    box-shadow: var(--shadow-subtle);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
    height: 60px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 400;
    transition: var(--transition-fast);
}

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

/* 移动端菜单按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle .bar {
    width: 18px;
    height: 1.5px;
    background: var(--text-primary);
    transition: var(--transition-normal);
}

/* ========================================
   Hero 首屏区域 - Apple 工程师风格
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 120px 20px 80px;
    background: var(--bg-primary);
}

.hero-content {
    text-align: center;
    max-width: 700px;
}

/* 头像 */
.hero-avatar {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 32px;
    box-shadow: var(--shadow-card);
}

/* 小标签 - eyebrow */
.hero-eyebrow {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
    display: block;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 600;
    letter-spacing: -0.03em;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.35rem;
    font-weight: 400;
    color: var(--text-secondary);
    margin-bottom: 16px;
    letter-spacing: -0.01em;
    line-height: 1.4;
}

.hero-description {
    font-size: 1rem;
    color: var(--text-tertiary);
    margin-bottom: 36px;
    line-height: 1.6;
}

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

.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 980px;
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition-normal);
    cursor: pointer;
    letter-spacing: -0.01em;
}

.btn-primary {
    background: var(--accent);
    color: #ffffff;
    border: none;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: scale(1.02);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--accent);
    border: none;
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    transform: scale(1.02);
}

/* 向下滚动提示 */
.scroll-down {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-tertiary);
    text-decoration: none;
    font-size: 0.75rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    transition: var(--transition-fast);
}

.scroll-down:hover {
    color: var(--text-primary);
}

.scroll-down::after {
    content: '';
    width: 1px;
    height: 20px;
    background: var(--divider);
}

/* ========================================
   关于我
   ======================================== */
.about {
    padding: var(--section-padding);
    background: var(--bg-secondary);
}

.about-content {
    max-width: var(--container-width);
    margin: 0 auto;
}

.about-text {
    max-width: 720px;
    margin: 0 auto 60px;
    text-align: center;
}

.about-text .lead {
    font-size: 1.35rem;
    color: var(--text-primary);
    margin-bottom: 20px;
    font-weight: 500;
    letter-spacing: -0.01em;
    line-height: 1.4;
}

.about-text p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
}

.about-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.about-card {
    background: var(--bg-card);
    border: 1px solid var(--divider-light);
    border-radius: 16px;
    padding: 28px;
    text-align: center;
    transition: var(--transition-normal);
}

.about-card:hover {
    box-shadow: var(--shadow-card);
    transform: translateY(-2px);
}

.card-icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.about-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.about-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* ========================================
   技能区
   ======================================== */
.skills {
    padding: var(--section-padding);
    background: var(--bg-primary);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.skill-card {
    background: var(--bg-secondary);
    border: 1px solid var(--divider-light);
    border-radius: 16px;
    padding: 28px;
    transition: var(--transition-normal);
}

.skill-card:hover {
    box-shadow: var(--shadow-card);
    transform: translateY(-2px);
}

.skill-icon {
    font-size: 1.75rem;
    margin-bottom: 14px;
}

.skill-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.skill-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 16px;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag {
    background: var(--accent-light);
    color: var(--accent);
    padding: 5px 12px;
    border-radius: 980px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* ========================================
   项目作品区
   ======================================== */
.projects {
    padding: var(--section-padding);
    background: var(--bg-secondary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.project-card {
    background: var(--bg-card);
    border: 1px solid var(--divider-light);
    border-radius: 16px;
    padding: 28px;
    transition: var(--transition-normal);
}

.project-card:hover {
    box-shadow: var(--shadow-card);
    transform: translateY(-2px);
}

.project-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.project-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 16px;
}

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

.tech-tag {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    padding: 5px 12px;
    border-radius: 980px;
    font-size: 0.8rem;
    font-weight: 500;
}

.project-link {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.project-link:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* ========================================
   联系方式
   ======================================== */
.contact {
    padding: var(--section-padding);
    background: var(--bg-primary);
    text-align: center;
}

.contact-intro {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 48px;
    margin-top: -40px;
}

.contact-grid {
    display: flex;
    justify-content: center;
    gap: 20px;
    max-width: 500px;
    margin: 0 auto;
}

.contact-item {
    background: var(--bg-secondary);
    border: 1px solid var(--divider-light);
    border-radius: 16px;
    padding: 24px 32px;
    text-decoration: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    transition: var(--transition-normal);
    flex: 1;
}

.contact-item:hover {
    box-shadow: var(--shadow-card);
    transform: translateY(-2px);
}

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

.contact-label {
    color: var(--text-tertiary);
    font-size: 0.8rem;
    font-weight: 500;
}

.contact-value {
    color: var(--accent);
    font-size: 0.95rem;
    font-weight: 500;
}

/* 返回顶部按钮 */
.back-to-top {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--accent);
    text-decoration: none;
    margin-top: 48px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.back-to-top:hover {
    color: var(--accent-hover);
}

/* ========================================
   页脚
   ======================================== */
.footer {
    padding: 40px 20px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--divider-light);
    text-align: center;
}

.copyright {
    color: var(--text-tertiary);
    font-size: 0.85rem;
    margin-bottom: 4px;
}

.footer-text {
    color: var(--text-tertiary);
    font-size: 0.8rem;
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 768px) {
    /* 导航栏 */
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        padding: 24px 20px;
        gap: 20px;
        border-bottom: 1px solid var(--divider);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-normal);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    /* Hero */
    .hero {
        padding: 100px 20px 60px;
    }
    
    .hero-subtitle {
        font-size: 1.15rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 240px;
        text-align: center;
    }
    
    /* 标题 */
    .section-title {
        font-size: 2rem;
        margin-bottom: 40px;
    }
    
    /* 区块间距 */
    .about, .skills, .projects, .contact {
        padding: 80px 20px;
    }
    
    /* 卡片网格 */
    .about-cards,
    .skills-grid,
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        flex-direction: column;
    }
    
    .about-text .lead {
        font-size: 1.15rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
}

/* ========================================
   滚动淡入动画
   ======================================== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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