/* 全局样式 - 现代科技风格 */
:root {
    --primary-color: #00d4ff; /* 科技蓝 */
    --secondary-color: #ff6b6b; /* 活力红 */
    --accent-color: #4ecdc4; /* 青绿色 */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --bg-dark: #0a0a0a;
    --bg-card: #1a1a1a;
    --bg-glass: rgba(255, 255, 255, 0.05);
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #666666;
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.3);
    --transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-fast: all 0.2s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Roboto', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--dark-gray);
    background-color: var(--white);
}

.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
}

section {
    padding: 120px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
    position: relative;
}

.section-header h2 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    position: relative;
    display: inline-block;
    letter-spacing: -0.02em;
}

.section-header h2::before {
    content: '';
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 4px;
    background: var(--gradient-accent);
    border-radius: 2px;
}

.section-header h2::after {
    content: '';
    position: absolute;
    width: 100px;
    height: 2px;
    background: var(--gradient-primary);
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 1px;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.2rem;
    font-weight: 300;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.8;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 32px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    text-align: center;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    letter-spacing: 0.5px;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-primary);
    box-shadow: 0 8px 32px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 12px 40px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: var(--bg-glass);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(20px);
}

.btn-secondary:hover {
    background: var(--gradient-accent);
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-glow);
    border-color: transparent;
}

.btn i {
    margin-right: 8px;
    font-size: 1.1rem;
}

/* 导航栏样式 - 玻璃态效果 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.nav-menu {
    display: flex;
    list-style: none;
    align-items: center;
}

.nav-menu li {
    margin-left: 40px;
}

.nav-menu li a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
    padding: 8px 16px;
    border-radius: 25px;
    letter-spacing: 0.3px;
}

.nav-menu li a:hover,
.nav-menu li a.active {
    color: var(--text-primary);
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    transform: translateY(-2px);
}

.nav-menu li a::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-accent);
    border-radius: 25px;
    opacity: 0;
    transition: var(--transition);
    z-index: -1;
}

.nav-menu li a.active::before {
    opacity: 0.2;
}

.nav-menu li a:hover::before {
    opacity: 0.1;
}

.menu-toggle {
    display: none;
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--text-primary);
    padding: 8px;
    border-radius: 8px;
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.menu-toggle:hover {
    background: var(--gradient-accent);
    transform: scale(1.05);
}

/* 首页英雄区样式 - 未来科技感 + 视频背景 */
.hero {
    height: 100vh;
    background: var(--bg-dark);
    display: flex;
    align-items: center;
    text-align: center;
    color: var(--text-primary);
    margin-top: 0;
    padding-top: 80px;
    position: relative;
    overflow: hidden;
}

/* 视频背景样式 */
.hero-video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    transform: translate(-50%, -50%);
    z-index: 0;
    object-fit: cover;
}

/* 视频遮罩层 - 轻微暗化以突出文字 */
.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
    z-index: 1;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-content h1 {
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 800;
    margin-bottom: 30px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.03em;
    line-height: 1.1;
    animation: fadeInDown 1s ease;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.hero-content p {
    font-size: 1.4rem;
    font-weight: 300;
    margin-bottom: 40px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    color: var(--text-secondary);
    line-height: 1.8;
    animation: fadeInUp 1s ease 0.3s both;
}

.hero-buttons {
    animation: fadeIn 1.5s ease 0.6s both;
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-buttons .btn {
    min-width: 180px;
}



/* 作品集样式 - 现代卡片设计 */
.portfolio {
    background: var(--bg-dark);
    position: relative;
}

.portfolio::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 30% 20%, rgba(120, 119, 198, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 70% 80%, rgba(255, 119, 198, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.portfolio-filter {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
    gap: 12px;
}

.filter-btn {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    padding: 12px 24px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    border-radius: 50px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    letter-spacing: 0.3px;
    position: relative;
    overflow: hidden;
}

.filter-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    transition: left 0.3s ease;
    z-index: -1;
}

.filter-btn:hover::before,
.filter-btn.active::before {
    left: 0;
}

.filter-btn:hover,
.filter-btn.active {
    color: var(--text-primary);
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 40px;
    position: relative;
    z-index: 1;
}

.portfolio-item {
    border-radius: 20px;
    overflow: hidden;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.portfolio-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition);
    z-index: -1;
}

.portfolio-item:hover {
    transform: translateY(-15px) rotateX(5deg);
    box-shadow: 
        0 25px 50px rgba(0, 0, 0, 0.3),
        0 0 30px rgba(102, 126, 234, 0.2);
    border-color: rgba(102, 126, 234, 0.3);
}

.portfolio-item:hover::before {
    opacity: 0.05;
}

.portfolio-img {
    position: relative;
    overflow: hidden;
    height: 280px;
    background: var(--gradient-primary);
}

.portfolio-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
    filter: brightness(0.9);
}

.portfolio-item:hover .portfolio-img img {
    transform: scale(1.1);
    filter: brightness(1.1);
}

.portfolio-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.9) 0%, rgba(118, 75, 162, 0.9) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.portfolio-item:hover .portfolio-overlay {
    opacity: 1;
}

.overlay-content {
    text-align: center;
    padding: 30px;
    color: var(--text-primary);
    transform: translateY(20px);
    transition: var(--transition);
}

.portfolio-item:hover .overlay-content {
    transform: translateY(0);
}

.overlay-content h3 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 15px;
    letter-spacing: -0.02em;
}

.overlay-content p {
    margin-bottom: 25px;
    font-weight: 300;
    line-height: 1.6;
    opacity: 0.9;
}

.view-model {
    display: inline-flex;
    align-items: center;
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.2);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    letter-spacing: 0.3px;
}

.view-model:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255, 255, 255, 0.2);
}

.view-model i {
    margin-right: 8px;
    font-size: 1rem;
}

/* 3D模型查看器模态框样式 - 现代玻璃态 */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    animation: modalFadeIn 0.3s ease;
}

@keyframes modalFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    margin: 3% auto;
    padding: 30px;
    border-radius: 20px;
    width: 90%;
    max-width: 1200px;
    position: relative;
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    box-shadow: 
        0 25px 50px rgba(0, 0, 0, 0.5),
        0 0 50px rgba(102, 126, 234, 0.2);
    animation: modalSlideIn 0.4s ease;
}

@keyframes modalSlideIn {
    from { 
        opacity: 0;
        transform: translateY(-50px) scale(0.9);
    }
    to { 
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.close-modal {
    position: absolute;
    top: 20px;
    right: 25px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: bold;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 50%;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.close-modal:hover {
    color: var(--text-primary);
    background: var(--gradient-secondary);
    transform: scale(1.1);
    box-shadow: 0 5px 15px rgba(255, 107, 107, 0.3);
}

#model-title {
    margin-bottom: 25px;
    font-size: 1.8rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-align: center;
    letter-spacing: -0.02em;
}

#model-container {
    width: 100%;
    height: 600px;
    background: var(--bg-dark);
    border-radius: 15px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    position: relative;
}

#model-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 30% 30%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 70% 70%, rgba(255, 107, 107, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 1;
}

#model-container canvas {
    position: relative;
    z-index: 2;
}

/* 专业技能样式 - 现代卡片设计 */
.skills {
    background: var(--bg-dark);
    position: relative;
}

.skills::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 40% 20%, rgba(78, 205, 196, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 60% 80%, rgba(102, 126, 234, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.skills-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
    position: relative;
    z-index: 1;
}

.skill-category {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 40px;
    transition: var(--transition);
    position: relative;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    overflow: hidden;
}

.skill-category::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition);
    z-index: -1;
}

.skill-category:hover {
    transform: translateY(-10px) rotateX(5deg);
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.3),
        0 0 30px rgba(102, 126, 234, 0.2);
    border-color: rgba(102, 126, 234, 0.3);
}

.skill-category:hover::before {
    opacity: 0.05;
}

.skill-icon {
    font-size: 3.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 25px;
    text-align: center;
    filter: drop-shadow(0 0 10px rgba(102, 126, 234, 0.3));
}

.skill-category h3 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 30px;
    text-align: center;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.skill-category ul {
    list-style: none;
}

.skill-category li {
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    position: relative;
}

.skill-category li span {
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.95rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.skill-category li span::after {
    content: attr(data-level);
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 400;
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    overflow: hidden;
    position: relative;
}

.progress-bar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.5);
    animation: progressGlow 2s ease-in-out infinite alternate;
}

@keyframes progressGlow {
    0% { box-shadow: 0 0 5px rgba(102, 126, 234, 0.3); }
    100% { box-shadow: 0 0 15px rgba(102, 126, 234, 0.7); }
}

.progress {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 10px;
    position: relative;
    overflow: hidden;
    animation: progressLoad 2s ease-out;
}

@keyframes progressLoad {
    0% { width: 0; }
}

.progress::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: progressShine 2s ease-in-out infinite;
}

@keyframes progressShine {
    0% { transform: translateX(-100%); }
    50% { transform: translateX(100%); }
    100% { transform: translateX(100%); }
}

/* 项目经历时间轴样式 - 现代科技风格 */
.projects {
    background: var(--bg-dark);
    position: relative;
}

.projects::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 30%, rgba(78, 205, 196, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(240, 147, 251, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.timeline {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
    z-index: 1;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 2px;
    background: var(--gradient-primary);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -1px;
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.5);
}

.timeline-item {
    padding: 20px 60px;
    position: relative;
    width: 50%;
    box-sizing: border-box;
    margin-bottom: 50px;
    animation: timelineSlideIn 0.6s ease forwards;
    opacity: 0;
}

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

.timeline-item:nth-child(odd) {
    left: 0;
    animation-delay: 0.1s;
}

.timeline-item:nth-child(even) {
    left: 50%;
    animation-delay: 0.2s;
}

.timeline-dot {
    position: absolute;
    width: 16px;
    height: 16px;
    background: var(--gradient-primary);
    border: 3px solid var(--bg-dark);
    border-radius: 50%;
    z-index: 2;
    box-shadow: 
        0 0 20px rgba(102, 126, 234, 0.6),
        inset 0 0 10px rgba(255, 255, 255, 0.3);
    animation: dotPulse 2s ease-in-out infinite;
}

@keyframes dotPulse {
    0%, 100% { 
        transform: scale(1);
        box-shadow: 0 0 20px rgba(102, 126, 234, 0.6);
    }
    50% { 
        transform: scale(1.2);
        box-shadow: 0 0 30px rgba(102, 126, 234, 0.8);
    }
}

.timeline-item:nth-child(odd) .timeline-dot {
    right: -8px;
    top: 30px;
}

.timeline-item:nth-child(even) .timeline-dot {
    left: -8px;
    top: 30px;
}

.timeline-date {
    position: absolute;
    top: 30px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary-color);
    background: var(--bg-glass);
    padding: 6px 12px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    white-space: nowrap;
}

.timeline-item:nth-child(odd) .timeline-date {
    right: -180px;
}

.timeline-item:nth-child(even) .timeline-date {
    left: -180px;
}

.timeline-content {
    padding: 30px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.timeline-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition);
    z-index: -1;
}

.timeline-content:hover {
    transform: translateY(-5px);
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.3),
        0 0 30px rgba(102, 126, 234, 0.2);
    border-color: rgba(102, 126, 234, 0.3);
}

.timeline-content:hover::before {
    opacity: 0.05;
}

.timeline-content h3 {
    font-size: 1.4rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 15px;
    letter-spacing: -0.02em;
}

.timeline-content p {
    margin-bottom: 20px;
    color: var(--text-secondary);
    line-height: 1.7;
    font-weight: 300;
}

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

.timeline-tags span {
    background: var(--bg-glass);
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 25px;
    font-size: 0.85rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: var(--transition);
    letter-spacing: 0.3px;
}

.timeline-tags span:hover {
    background: var(--gradient-accent);
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(78, 205, 196, 0.3);
}

/* 联系方式样式 - 现代玻璃态设计 */
.contact {
    background: var(--bg-dark);
    position: relative;
}

.contact::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 70% 30%, rgba(240, 147, 251, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 30% 70%, rgba(78, 205, 196, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.contact-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 40px;
    align-items: start;
    position: relative;
    z-index: 1;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.info-item {
    text-align: center;
    padding: 30px 25px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.info-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition);
    z-index: -1;
}

.info-item:hover {
    transform: translateY(-8px);
    box-shadow: 
        0 20px 40px rgba(0, 0, 0, 0.3),
        0 0 30px rgba(102, 126, 234, 0.2);
    border-color: rgba(102, 126, 234, 0.3);
}

.info-item:hover::before {
    opacity: 0.05;
}

.info-item i {
    font-size: 2.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    filter: drop-shadow(0 0 10px rgba(102, 126, 234, 0.3));
}

.info-item h3 {
    margin-bottom: 12px;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.2rem;
}

.info-item p {
    color: var(--text-secondary);
    font-weight: 300;
}

.resume-download {
    text-align: center;
    padding: 35px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    grid-column: 1 / -1;
    margin-top: 25px;
    position: relative;
    overflow: hidden;
}

.resume-download::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-secondary);
    opacity: 0;
    transition: var(--transition);
    z-index: -1;
}

.resume-download:hover::before {
    opacity: 0.05;
}

.resume-download h3 {
    margin-bottom: 15px;
    font-size: 1.4rem;
    font-weight: 700;
    background: var(--gradient-secondary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.resume-download p {
    margin-bottom: 25px;
    color: var(--text-secondary);
    font-weight: 300;
}

.contact-form {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 40px;
    border-radius: 20px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: relative;
    overflow: hidden;
}

.contact-form::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-accent);
    opacity: 0;
    transition: var(--transition);
    z-index: -1;
}

.contact-form:hover::before {
    opacity: 0.03;
}

.contact-form h3 {
    margin-bottom: 30px;
    font-size: 1.6rem;
    font-weight: 700;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-align: center;
}

.form-group {
    margin-bottom: 25px;
    position: relative;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 16px 20px;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: var(--transition);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
    background: rgba(255, 255, 255, 0.08);
}

.form-group textarea {
    height: 150px;
    resize: vertical;
}

/* 页脚样式 - 现代科技风格 */
.footer {
    background: var(--bg-dark);
    background-image: 
        radial-gradient(circle at 25% 25%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(255, 107, 107, 0.1) 0%, transparent 50%);
    color: var(--text-primary);
    padding: 80px 0 30px;
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gradient-primary);
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.5);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 40px;
    position: relative;
    z-index: 1;
}

.footer-logo h2 {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 15px;
    letter-spacing: -0.02em;
}

.footer-logo p {
    color: var(--text-secondary);
    font-weight: 300;
    max-width: 400px;
    line-height: 1.6;
}

.footer-social {
    display: flex;
    gap: 15px;
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.footer-social a::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition);
    z-index: -1;
}

.footer-social a:hover {
    color: var(--text-primary);
    transform: translateY(-8px) scale(1.1);
    box-shadow: 
        0 15px 30px rgba(0, 0, 0, 0.3),
        0 0 20px rgba(102, 126, 234, 0.4);
    border-color: transparent;
}

.footer-social a:hover::before {
    opacity: 1;
}

.footer-social a i {
    font-size: 1.2rem;
    position: relative;
    z-index: 1;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    position: relative;
}

.footer-bottom p {
    color: var(--text-muted);
    font-weight: 300;
    font-size: 0.9rem;
}

/* 动画效果 */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

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

/* 响应式设计 */
@media screen and (max-width: 992px) {
    .section-header h2 {
        font-size: 2rem;
    }
    
    .hero-content h1 {
        font-size: 2.8rem;
    }
    
    .timeline::after {
        left: 31px;
    }
    
    .timeline-item {
        width: 100%;
        padding-left: 70px;
        padding-right: 25px;
    }
    
    .timeline-item:nth-child(even) {
        left: 0;
    }
    
    .timeline-item:nth-child(odd) .timeline-dot,
    .timeline-item:nth-child(even) .timeline-dot {
        left: 21px;
    }
    
    .timeline-item:nth-child(odd) .timeline-date,
    .timeline-item:nth-child(even) .timeline-date {
        right: auto;
        left: 70px;
        top: -30px;
        position: relative;
        font-weight: bold;
    }
}

@media screen and (max-width: 768px) {
    .menu-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: var(--white);
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding-top: 50px;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        margin: 15px 0;
    }
    
    .hero-content h1 {
        font-size: 2.2rem;
    }
    
    .hero-content p {
        font-size: 1.1rem;
    }
    
    .hero-buttons .btn {
        display: block;
        margin: 10px auto;
        width: 80%;
    }
    
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        width: 95%;
        margin: 10% auto;
    }
    
    #model-container {
        height: 350px;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-logo {
        margin-bottom: 20px;
    }
    
    .footer-social {
        justify-content: center;
    }
}

@media screen and (max-width: 480px) {
    .section-header h2 {
        font-size: 1.8rem;
    }
    
    .hero-content h1 {
        font-size: 1.8rem;
    }
    
    .skills-container,
    .contact-container {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
    }
}