/* ========================================
   范子能 - 个人介绍网站样式
   现代化、科技感设计风格
   ======================================== */

/* CSS 变量 */
:root {
    /* 主色调 - 科技感蓝紫渐变 */
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --secondary: #06b6d4;
    --accent: #f59e0b;

    /* 背景色 */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-card: rgba(30, 41, 59, 0.8);

    /* 文字色 */
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    /* 边框与阴影 */
    --border-color: rgba(99, 102, 241, 0.2);
    --border-light: rgba(148, 163, 184, 0.1);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);

    /* 字体 */
    --font-family: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;

    /* 间距 */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;

    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* 过渡 */
    --transition-fast: 150ms ease;
    --transition: 300ms ease;
    --transition-slow: 500ms ease;
}

/* ========================================
   基础重置
   ======================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ========================================
   粒子背景
   ======================================== */
.particles-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.particles-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(6, 182, 212, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 50% 80%, rgba(245, 158, 11, 0.05) 0%, transparent 50%);
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--primary-light);
    border-radius: 50%;
    opacity: 0.3;
    animation: float 20s infinite ease-in-out;
}

@keyframes float {
    0%, 100% { transform: translateY(0) translateX(0); opacity: 0.3; }
    25% { transform: translateY(-20px) translateX(10px); opacity: 0.5; }
    50% { transform: translateY(-10px) translateX(-10px); opacity: 0.3; }
    75% { transform: translateY(-30px) translateX(5px); opacity: 0.4; }
}

/* ========================================
   导航栏
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-sm) 0;
    transition: var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-light);
    padding: var(--space-xs) 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1rem;
}

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

.nav-links {
    display: flex;
    gap: var(--space-lg);
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    padding: var(--space-xs) 0;
    position: relative;
    transition: var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transition: var(--transition);
}

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

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

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

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ========================================
   Hero 区域
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: var(--space-xl) var(--space-md);
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 800px;
    transition: transform 0.3s ease-out;
    will-change: transform;
}

.hero-greeting {
    margin-bottom: var(--space-sm);
}

.greeting-text {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.typing-container {
    display: inline-flex;
    align-items: center;
    margin-top: var(--space-xs);
}

.typing-text {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-light);
}

.typing-cursor {
    font-size: 1.5rem;
    color: var(--primary-light);
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    background: linear-gradient(135deg, var(--text-primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.hero-subtitle .highlight {
    color: var(--secondary);
    font-weight: 600;
}

.hero-description {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: var(--space-xl);
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-light);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 0.875rem 1.5rem;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-light);
}

.btn-secondary:hover {
    background: var(--bg-secondary);
    border-color: var(--border-color);
}

.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* 滚动指示器 */
.scroll-indicator {
    position: absolute;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    animation: bounce 2s infinite;
}

.scroll-mouse {
    width: 26px;
    height: 40px;
    border: 2px solid var(--text-muted);
    border-radius: 13px;
    display: flex;
    justify-content: center;
    padding-top: 8px;
}

.scroll-wheel {
    width: 4px;
    height: 8px;
    background: var(--text-muted);
    border-radius: 2px;
    animation: scroll 2s infinite;
}

.scroll-text {
    font-size: 0.75rem;
    color: var(--text-muted);
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

@keyframes scroll {
    0% { transform: translateY(0); opacity: 1; }
    100% { transform: translateY(10px); opacity: 0; }
}

/* ========================================
   通用区块样式
   ======================================== */
.section {
    padding: var(--space-2xl) var(--space-md);
    position: relative;
    z-index: 1;
}

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

.section-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.section-tag {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-light);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    border-radius: var(--radius-md);
    margin-bottom: var(--space-sm);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--space-xs);
    background: linear-gradient(135deg, var(--text-primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

/* ========================================
   关于我区域
   ======================================== */
.about-content {
    display: grid;
    grid-template-columns: 0.8fr 1.5fr;
    gap: var(--space-xl);
    align-items: start;
}

.about-image {
    position: relative;
}

.image-frame {
    position: relative;
    width: 100%;
    max-width: 240px;
    margin: 0 auto;
}

.image-placeholder {
    aspect-ratio: 3/4;
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 5rem;
    color: var(--text-muted);
    position: relative;
    z-index: 1;
    overflow: hidden;
}

.image-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
    border-radius: var(--radius-xl);
    transition: transform 0.3s ease;
}

.image-frame:hover .image-placeholder img {
    transform: scale(1.05);
}

.image-border {
    position: absolute;
    top: 15px;
    left: 15px;
    right: -15px;
    bottom: -15px;
    border: 2px solid var(--primary);
    border-radius: var(--radius-xl);
    z-index: 0;
    opacity: 0.5;
}

.floating-card {
    position: absolute;
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-sm) var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.85rem;
    color: var(--text-secondary);
    box-shadow: var(--shadow);
    animation: float-card 6s ease-in-out infinite;
    z-index: 10;
    opacity: 0.6;
}

.floating-card i {
    color: var(--primary-light);
}

.card-1 {
    top: -15px;
    right: 10px;
    animation-delay: 0s;
}

.card-2 {
    top: 45%;
    left: -15px;
    animation-delay: 3s;
}

@keyframes float-card {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

.about-info {
    padding-top: var(--space-md);
}

.about-name {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.about-role {
    color: var(--primary-light);
    font-size: 1.1rem;
    margin-bottom: var(--space-lg);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.info-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.info-item i {
    color: var(--primary-light);
    width: 20px;
}

.about-bio {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-lg);
}

.about-bio p {
    margin-bottom: var(--space-sm);
}

.highlight-text {
    color: var(--secondary);
    font-weight: 500;
}

.about-actions {
    display: flex;
    gap: var(--space-sm);
}

/* ========================================
   技能区域
   ======================================== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-lg);
}

.skill-category {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.skill-category::before {
    content: '';
    position: absolute;
    top: var(--glow-y, 50%);
    left: var(--glow-x, 50%);
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.3) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.skill-category:hover::before {
    opacity: 1;
}

.skill-category:hover {
    border-color: var(--border-color);
    box-shadow: var(--shadow-lg);
}

.category-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--border-light);
}

.category-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

.category-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.skill-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.skill-item {
    position: relative;
}

.skill-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-xs);
}

.skill-name {
    font-weight: 500;
    color: var(--text-primary);
}

.skill-level {
    font-size: 0.8rem;
    color: var(--primary-light);
    background: rgba(99, 102, 241, 0.1);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
}

.skill-bar {
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: var(--space-xs);
}

.skill-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 3px;
    width: 0;
    transition: width 1s ease;
}

.skill-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.skill-tag {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: var(--space-xs) var(--space-sm);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    color: var(--text-secondary);
    border: 1px solid var(--border-light);
}

.skill-tag i {
    color: var(--accent);
    font-size: 0.7rem;
}

/* ========================================
   项目区域
   ======================================== */
.projects-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.project-card {
    display: grid;
    grid-template-columns: 280px 1fr;
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: var(--transition);
    position: relative;
    transform-style: preserve-3d;
}

.project-card::before {
    content: '';
    position: absolute;
    top: var(--glow-y, 50%);
    left: var(--glow-x, 50%);
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.2) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
    z-index: 1;
}

.project-card:hover::before {
    opacity: 1;
}

.project-card:hover {
    border-color: var(--border-color);
    box-shadow: var(--shadow-lg);
}

.project-card.featured {
    border-color: rgba(99, 102, 241, 0.3);
}

.project-image {
    position: relative;
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
}

.project-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    margin-bottom: var(--space-sm);
}

.project-status {
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
}

.status-badge {
    display: inline-block;
    padding: 4px 12px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-md);
}

.status-badge.secondary {
    background: linear-gradient(135deg, var(--secondary), #0891b2);
}

.project-content {
    padding: var(--space-lg);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-sm);
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.project-title {
    font-size: 1.35rem;
    font-weight: 600;
}

.project-date {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.tech-tag {
    padding: 4px 10px;
    background: var(--bg-tertiary);
    color: var(--secondary);
    font-size: 0.8rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-light);
}

.project-desc p {
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
    line-height: 1.7;
}

.project-features {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.project-features li {
    display: flex;
    align-items: flex-start;
    gap: var(--space-xs);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.project-features li i {
    color: var(--accent);
    margin-top: 4px;
    flex-shrink: 0;
}

.project-features .highlight {
    color: var(--accent);
    font-weight: 600;
}

/* ========================================
   经历区域
   ======================================== */
.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 24px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary), var(--secondary));
}

.timeline-item {
    display: flex;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.timeline-marker {
    width: 50px;
    height: 50px;
    background: var(--bg-tertiary);
    border: 2px solid var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--primary-light);
    font-size: 1.1rem;
    z-index: 1;
}

.timeline-content {
    flex: 1;
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.timeline-content::before {
    content: '';
    position: absolute;
    top: var(--glow-y, 50%);
    left: var(--glow-x, 50%);
    width: 250px;
    height: 250px;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.2) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.timeline-content:hover::before {
    opacity: 1;
}

.timeline-content:hover {
    border-color: var(--border-color);
}

.timeline-header {
    margin-bottom: var(--space-md);
}

.timeline-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.timeline-company {
    display: block;
    color: var(--primary-light);
    font-size: 0.95rem;
    margin-bottom: var(--space-xs);
}

.timeline-date {
    display: inline-block;
    padding: 4px 12px;
    background: var(--bg-tertiary);
    color: var(--text-muted);
    font-size: 0.8rem;
    border-radius: var(--radius-md);
}

.timeline-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.timeline-list li {
    color: var(--text-secondary);
    line-height: 1.7;
    padding-left: var(--space-sm);
    position: relative;
}

.timeline-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-light);
}

.timeline-list li .highlight {
    color: var(--secondary);
    font-weight: 500;
}

/* ========================================
   联系区域
   ======================================== */
.contact-content {
    max-width: 800px;
    margin: 0 auto;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.contact-card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    transform-style: preserve-3d;
}

.contact-card::before {
    content: '';
    position: absolute;
    top: var(--glow-y, 50%);
    left: var(--glow-x, 50%);
    width: 250px;
    height: 250px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.25) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.contact-card:hover::before {
    opacity: 1;
}

.contact-card:hover {
    border-color: var(--border-color);
    box-shadow: var(--shadow-glow);
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-sm);
    font-size: 1.5rem;
    color: white;
}

.contact-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.contact-card p {
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    color: var(--primary-light);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

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

.contact-link i {
    font-size: 0.8rem;
    transition: var(--transition-fast);
}

.contact-link:hover i {
    transform: translateX(5px);
}

.contact-note {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.contact-footer {
    text-align: center;
}

.contact-message {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-style: italic;
    line-height: 1.8;
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   页脚
   ======================================== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-light);
    padding: var(--space-xl) 0 var(--space-md);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.footer-logo i {
    color: var(--primary-light);
}

.footer-tagline {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: var(--space-lg);
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

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

.footer-social {
    display: flex;
    gap: var(--space-sm);
}

.footer-social a {
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--primary);
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-light);
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-credit {
    margin-top: var(--space-xs);
}

.footer-credit i {
    color: #ef4444;
}

/* ========================================
   动画效果
   ======================================== */
.animate-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 3rem;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .about-image {
        order: -1;
    }

    .image-frame {
        max-width: 250px;
    }

    .floating-card {
        display: none;
    }

    .project-card {
        grid-template-columns: 1fr;
    }

    .project-image {
        padding: var(--space-md);
    }

    .project-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        padding: var(--space-md);
        border-bottom: 1px solid var(--border-light);
    }

    .nav-links.active {
        display: flex;
    }

    .menu-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--space-md);
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .section-title {
        font-size: 2rem;
    }

    .info-grid {
        grid-template-columns: 1fr;
    }

    .skills-grid {
        grid-template-columns: 1fr;
    }

    .contact-info {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    :root {
        --space-md: 1rem;
        --space-lg: 1.5rem;
        --space-xl: 2rem;
        --space-2xl: 2.5rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .typing-text {
        font-size: 1.2rem;
    }

    .section {
        padding: var(--space-xl) var(--space-sm);
    }

    .skill-category,
    .timeline-content,
    .contact-card {
        padding: var(--space-md);
    }
}