/* ===== CSS 变量 - 主题系统 ===== */
:root {
    /* 亮色主题 */
    --bg-primary: #f0f4f8;
    --bg-secondary: #ffffff;
    --bg-gradient-1: #667eea;
    --bg-gradient-2: #764ba2;
    --bg-gradient-3: #f093fb;
    --bg-gradient-4: #f5576c;
    
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    
    --glass-bg: rgba(255, 255, 255, 0.25);
    --glass-border: rgba(255, 255, 255, 0.3);
    --glass-shadow: rgba(0, 0, 0, 0.1);
    
    --accent-primary: #667eea;
    --accent-secondary: #764ba2;
    --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    
    --card-bg: rgba(255, 255, 255, 0.7);
    --input-bg: rgba(255, 255, 255, 0.5);
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

[data-theme="dark"] {
    /* 暗色主题 */
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-gradient-1: #1a1a2e;
    --bg-gradient-2: #16213e;
    --bg-gradient-3: #0f3460;
    --bg-gradient-4: #533483;
    
    --text-primary: #f7fafc;
    --text-secondary: #e2e8f0;
    --text-muted: #a0aec0;
    
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: rgba(0, 0, 0, 0.3);
    
    --accent-primary: #818cf8;
    --accent-secondary: #a78bfa;
    --accent-gradient: linear-gradient(135deg, #818cf8 0%, #a78bfa 100%);
    
    --card-bg: rgba(30, 30, 50, 0.7);
    --input-bg: rgba(255, 255, 255, 0.08);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

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

/* ===== 背景动画 ===== */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.bg-gradient {
    position: absolute;
    width: 200%;
    height: 200%;
    top: -50%;
    left: -50%;
    background: 
        radial-gradient(circle at 20% 80%, var(--bg-gradient-1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, var(--bg-gradient-2) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, var(--bg-gradient-3) 0%, transparent 40%),
        radial-gradient(circle at 60% 60%, var(--bg-gradient-4) 0%, transparent 40%);
    opacity: 0.3;
    animation: gradientMove 20s ease-in-out infinite;
}

@keyframes gradientMove {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(2%, 2%) rotate(5deg); }
    50% { transform: translate(-1%, 3%) rotate(-5deg); }
    75% { transform: translate(3%, -2%) rotate(3deg); }
}

.floating-shapes {
    position: absolute;
    width: 100%;
    height: 100%;
}

.shape {
    position: absolute;
    border-radius: 50%;
    background: var(--accent-gradient);
    opacity: 0.1;
    filter: blur(60px);
    animation: float 15s ease-in-out infinite;
}

.shape-1 {
    width: 400px;
    height: 400px;
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 300px;
    height: 300px;
    top: 60%;
    right: 10%;
    animation-delay: -3s;
}

.shape-3 {
    width: 250px;
    height: 250px;
    bottom: 10%;
    left: 30%;
    animation-delay: -6s;
}

.shape-4 {
    width: 350px;
    height: 350px;
    top: 30%;
    right: 30%;
    animation-delay: -9s;
}

.shape-5 {
    width: 200px;
    height: 200px;
    top: 50%;
    left: 50%;
    animation-delay: -12s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -30px) scale(1.1); }
    50% { transform: translate(-20px, 20px) scale(0.9); }
    75% { transform: translate(20px, 40px) scale(1.05); }
}

/* ===== 毛玻璃效果 ===== */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: 0 8px 32px var(--glass-shadow);
}

.glass-btn {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    transition: all var(--transition-normal);
}

.glass-btn:hover {
    background: rgba(255, 255, 255, 0.35);
    transform: translateY(-3px);
    box-shadow: 0 10px 40px var(--glass-shadow);
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 5%;
    z-index: 1000;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    height: 60px;
    background: var(--card-bg);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo {
    font-size: 1.8rem;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 10px;
}

.nav-link {
    position: relative;
    padding: 10px 20px;
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    border-radius: 25px;
    transition: all var(--transition-normal);
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 5px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: all var(--transition-normal);
    transform: translateX(-50%);
    border-radius: 2px;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 30px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

/* ===== 主题切换按钮 ===== */
.theme-toggle {
    position: relative;
    width: 45px;
    height: 45px;
    border: none;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border-radius: 50%;
    cursor: pointer;
    overflow: hidden;
    transition: all var(--transition-normal);
    border: 1px solid var(--glass-border);
}

.theme-toggle:hover {
    transform: rotate(15deg) scale(1.1);
}

.theme-toggle i {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.2rem;
    transition: all var(--transition-normal);
}

.theme-toggle .fa-sun {
    color: #fbbf24;
    opacity: 1;
    transform: translate(-50%, -50%) rotate(0deg);
}

.theme-toggle .fa-moon {
    color: #818cf8;
    opacity: 0;
    transform: translate(-50%, -50%) rotate(-90deg);
}

[data-theme="dark"] .theme-toggle .fa-sun {
    opacity: 0;
    transform: translate(-50%, -50%) rotate(90deg);
}

[data-theme="dark"] .theme-toggle .fa-moon {
    opacity: 1;
    transform: translate(-50%, -50%) rotate(0deg);
}

/* ===== 移动端菜单 ===== */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 45px;
    height: 45px;
    border: none;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border-radius: 10px;
    cursor: pointer;
    gap: 5px;
    border: 1px solid var(--glass-border);
}

.menu-toggle span {
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-normal);
}

.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);
}

.mobile-menu {
    position: fixed;
    top: 80px;
    left: 5%;
    right: 5%;
    padding: 20px;
    border-radius: 20px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-20px);
    transition: all var(--transition-normal);
    z-index: 999;
}

.mobile-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.mobile-nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.mobile-nav-links .nav-link {
    display: block;
    padding: 15px 20px;
    text-align: center;
    border-radius: 15px;
}

/* ===== Hero 区域 ===== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 100px 5% 50px;
    position: relative;
}

.hero-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 50px;
    max-width: 1200px;
    width: 100%;
}

.hero-text {
    flex: 1;
}

.greeting {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.name {
    font-size: 4rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 15px;
    line-height: 1.2;
}

.title {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.description {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 500px;
    margin-bottom: 30px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 15px 30px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-normal);
}

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

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--accent-primary);
}

.btn-secondary:hover {
    background: var(--accent-primary);
    color: white;
}

.hero-image {
    flex: 0 0 auto;
}

.avatar-container {
    position: relative;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    padding: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.avatar {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
}

.avatar-glow {
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    border-radius: 50%;
    background: var(--accent-gradient);
    opacity: 0.3;
    filter: blur(30px);
    z-index: -1;
    animation: glowPulse 3s ease-in-out infinite;
}

@keyframes glowPulse {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.05); }
}

/* ===== 滚动指示器 ===== */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: var(--text-muted);
    font-size: 0.9rem;
    animation: bounce 2s ease-in-out infinite;
}

.mouse {
    width: 25px;
    height: 40px;
    border: 2px solid var(--text-muted);
    border-radius: 15px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--text-muted);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 2s ease-in-out infinite;
}

@keyframes scroll {
    0%, 100% { opacity: 1; top: 8px; }
    50% { opacity: 0; top: 20px; }
}

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

/* ===== 通用区域样式 ===== */
.section {
    padding: 100px 5%;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.section-title {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 60px;
    text-align: center;
}

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

/* ===== 关于我 ===== */
.about-content {
    display: flex;
    justify-content: center;
}

.about-card {
    max-width: 900px;
    padding: 50px;
    border-radius: 30px;
}

.about-text {
    margin-bottom: 40px;
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 1.1rem;
    line-height: 1.8;
}

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

.stat-item {
    text-align: center;
    padding: 30px 20px;
    border-radius: 20px;
    transition: all var(--transition-normal);
}

.stat-item:hover {
    transform: translateY(-5px);
}

.stat-number {
    display: block;
    font-size: 3rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ===== 技能 ===== */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.skill-card {
    padding: 35px;
    border-radius: 25px;
    transition: all var(--transition-normal);
    cursor: default;
}

.skill-card:hover {
    transform: translateY(-10px);
}

.skill-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    background: var(--accent-gradient);
    border-radius: 15px;
    margin-bottom: 20px;
    color: white;
}

.skill-name {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.skill-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 20px;
}

.skill-bar {
    height: 8px;
    background: var(--input-bg);
    border-radius: 10px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 10px;
    width: 0;
    transition: width 1.5s ease-out;
}

/* ===== 项目展示 ===== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.project-card {
    border-radius: 25px;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.project-card:hover {
    transform: translateY(-10px);
}

.project-image {
    position: relative;
    height: 220px;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.project-card:hover .project-image img {
    transform: scale(1.1);
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--accent-gradient);
    opacity: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    transition: opacity var(--transition-normal);
}

.project-card:hover .project-overlay {
    opacity: 0.9;
}

.project-link {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    color: var(--accent-primary);
    border-radius: 50%;
    font-size: 1.2rem;
    text-decoration: none;
    transform: translateY(20px);
    opacity: 0;
    transition: all var(--transition-normal);
}

.project-card:hover .project-link {
    transform: translateY(0);
    opacity: 1;
}

.project-link:hover {
    transform: scale(1.1);
}

.project-info {
    padding: 25px;
}

.project-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.project-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 15px;
}

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

.project-tag {
    padding: 5px 12px;
    background: var(--accent-gradient);
    color: white;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* ===== 联系 ===== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}

.contact-info {
    padding: 40px;
    border-radius: 25px;
}

.contact-info h3 {
    font-size: 1.8rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.contact-info > p {
    color: var(--text-muted);
    margin-bottom: 30px;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-method {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px;
    background: var(--input-bg);
    border-radius: 15px;
    text-decoration: none;
    color: var(--text-secondary);
    transition: all var(--transition-normal);
}

.contact-method:hover {
    background: var(--accent-gradient);
    color: white;
    transform: translateX(10px);
}

.contact-method i {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--glass-bg);
    border-radius: 10px;
    font-size: 1.2rem;
}

.contact-method:hover i {
    background: rgba(255, 255, 255, 0.2);
}

.contact-form {
    padding: 40px;
    border-radius: 25px;
}

.form-group {
    position: relative;
    margin-bottom: 30px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px 20px;
    background: var(--input-bg);
    border: 2px solid transparent;
    border-radius: 15px;
    font-size: 1rem;
    color: var(--text-primary);
    transition: all var(--transition-normal);
    font-family: inherit;
    resize: none;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    background: var(--card-bg);
}

.form-group label {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 1rem;
    pointer-events: none;
    transition: all var(--transition-normal);
}

.form-group textarea ~ label {
    top: 20px;
    transform: none;
}

.form-group input:focus ~ label,
.form-group input:not(:placeholder-shown) ~ label,
.form-group textarea:focus ~ label,
.form-group textarea:not(:placeholder-shown) ~ label {
    top: -10px;
    left: 15px;
    font-size: 0.85rem;
    padding: 0 5px;
    background: var(--card-bg);
    color: var(--accent-primary);
    border-radius: 5px;
}

/* 发送按钮：始终使用主色背景 + 白字，避免白天玻璃态变白导致看不清 */
.submit-btn {
    width: 100%;
    justify-content: center;
    border: none;
    font-size: 1.1rem;
    background: var(--accent-gradient) !important;
    color: #fff !important;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.submit-btn:hover {
    background: linear-gradient(135deg, #7c8ef5 0%, #8b6bb0 100%) !important;
    color: #fff !important;
    box-shadow: 0 10px 40px rgba(102, 126, 234, 0.45);
}

[data-theme="dark"] .submit-btn:hover {
    background: linear-gradient(135deg, #9ca8fa 0%, #a78bfa 100%) !important;
    color: #fff !important;
}

/* ===== 页脚 ===== */
.footer {
    padding: 40px 5%;
    margin-top: 50px;
    border-radius: 30px 30px 0 0;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 20px;
}

.social-link {
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--glass-bg);
    border-radius: 50%;
    color: var(--text-secondary);
    font-size: 1.2rem;
    text-decoration: none;
    transition: all var(--transition-normal);
    border: 1px solid var(--glass-border);
}

.social-link:hover {
    background: var(--accent-gradient);
    color: white;
    transform: translateY(-5px);
}

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

/* ===== 回到顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: 100;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-5px);
    background: var(--accent-gradient);
    color: white;
}

.back-to-top i {
    font-size: 1.2rem;
    color: var(--text-primary);
}

.back-to-top:hover i {
    color: white;
}

/* ===== Toast 消息 ===== */
.toast-container {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    padding: 15px 30px;
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border-radius: 15px;
    color: var(--text-primary);
    font-weight: 500;
    box-shadow: 0 10px 40px var(--glass-shadow);
    animation: toastIn 0.3s ease-out;
}

.toast.success {
    border-left: 4px solid #10b981;
}

.toast.error {
    border-left: 4px solid #ef4444;
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== 动画类 ===== */
.animate-fade-in {
    animation: fadeIn 0.8s ease-out forwards;
}

.animate-fade-in-delay {
    animation: fadeIn 0.8s ease-out 0.3s forwards;
    opacity: 0;
}

.animate-fade-in-delay-2 {
    animation: fadeIn 0.8s ease-out 0.6s forwards;
    opacity: 0;
}

.animate-slide-up {
    animation: slideUp 0.8s ease-out forwards;
}

.animate-slide-up-delay {
    animation: slideUp 0.8s ease-out 0.2s forwards;
    opacity: 0;
}

.animate-float {
    animation: floatElement 6s ease-in-out infinite;
}

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

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

@keyframes floatElement {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s ease-out;
}

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

/* ===== 响应式设计 ===== */
@media (max-width: 992px) {
    .nav-links {
        display: none;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .hero-content {
        flex-direction: column-reverse;
        text-align: center;
    }
    
    .hero-text {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .description {
        text-align: center;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .avatar-container {
        width: 250px;
        height: 250px;
    }
    
    .name {
        font-size: 3rem;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .section {
        padding: 80px 5%;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .about-card {
        padding: 30px;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-info,
    .contact-form {
        padding: 25px;
    }
    
    .name {
        font-size: 2.5rem;
    }
    
    .avatar-container {
        width: 200px;
        height: 200px;
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .navbar {
        padding: 0 4%;
    }
    
    .brand-name {
        display: none;
    }
    
    .name {
        font-size: 2rem;
    }
    
    .title {
        font-size: 1.2rem;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
}