/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0057FF;
    --secondary-color: #1769FF;
    --text-primary: #191919;
    --text-secondary: #696969;
    --bg-primary: #ffffff;
    --bg-secondary: #f9f9f9;
    --border-color: #e7e7e7;
    --hover-overlay: rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
}

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

/* 顶部导航栏 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
    transition: all 0.3s ease;
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 32px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 18px;
    color: var(--text-primary);
    cursor: pointer;
    transition: opacity 0.2s;
}

.logo:hover {
    opacity: 0.8;
}

.nav-links {
    display: flex;
    gap: 24px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    transition: color 0.2s;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

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

.nav-link:hover::after {
    width: 100%;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.search-container {
    position: relative;
}

.search-input {
    width: 280px;
    height: 40px;
    padding: 0 40px 0 16px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 14px;
    transition: all 0.3s;
    background: var(--bg-secondary);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 87, 255, 0.1);
    width: 320px;
}

.search-icon {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    pointer-events: none;
}

/* 按钮样式 */
.btn-primary {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 20px;
    font-weight: 500;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: none;
    padding: 10px 20px;
    border-radius: 20px;
    font-weight: 500;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
}

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

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--text-primary);
    padding: 14px 32px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-outline:hover {
    background: var(--text-primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-large {
    padding: 16px 36px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s;
}

/* 英雄区域 */
.hero {
    position: relative;
    margin-top: 64px;
    padding: 120px 24px;
    text-align: center;
    overflow: hidden;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-size: 72px;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: 20px;
    line-height: 1.6;
    margin-bottom: 40px;
    opacity: 0.95;
    animation: fadeInUp 0.8s ease 0.2s backwards;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    animation: fadeInUp 0.8s ease 0.4s backwards;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.gradient-blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    animation: float 20s infinite ease-in-out;
}

.blob-1 {
    width: 400px;
    height: 400px;
    background: #ff6b6b;
    top: -100px;
    left: -100px;
    animation-delay: 0s;
}

.blob-2 {
    width: 500px;
    height: 500px;
    background: #4ecdc4;
    top: 50%;
    right: -150px;
    animation-delay: 7s;
}

.blob-3 {
    width: 350px;
    height: 350px;
    background: #ffe66d;
    bottom: -100px;
    left: 50%;
    animation-delay: 14s;
}

/* 过滤器栏 */
.filter-bar {
    position: sticky;
    top: 64px;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    z-index: 999;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.filter-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 16px 24px;
}

.filter-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

.filter-tab {
    background: transparent;
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: 500;
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.filter-tab.active {
    background: var(--text-primary);
    color: white;
}

.filter-tab:hover:not(.active) {
    background: var(--hover-overlay);
    color: var(--text-primary);
}

.filter-categories {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.category-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 6px 16px;
    border-radius: 16px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.category-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: rgba(0, 87, 255, 0.05);
}

/* 主内容区域 */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 40px 24px;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 32px;
    margin-bottom: 60px;
}

.project-card {
    background: var(--bg-primary);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.3s ease;
    animation: fadeIn 0.5s ease;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.project-image {
    width: 100%;
    height: 260px;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.project-card:hover .project-image {
    transform: scale(1.05);
}

.project-info {
    padding: 20px;
}

.project-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.project-author {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.author-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.author-name {
    font-size: 14px;
    color: var(--text-secondary);
}

.project-stats {
    display: flex;
    gap: 16px;
    font-size: 13px;
    color: var(--text-secondary);
}

.stat {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* 加载更多 */
.load-more {
    text-align: center;
}

.btn-load-more {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    padding: 14px 48px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-load-more:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

/* 页脚 */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 60px 24px 24px;
    margin-top: 80px;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
}

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

.footer-section li {
    margin-bottom: 10px;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

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

.social-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.social-link {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.social-link:hover {
    color: white;
}

.footer-bottom {
    max-width: 1400px;
    margin: 0 auto;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
}

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

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

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(30px, -50px) scale(1.1);
    }
    66% {
        transform: translate(-20px, 20px) scale(0.9);
    }
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 56px;
    }
    
    .projects-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 24px;
    }
}

@media (max-width: 768px) {
    .header-container {
        padding: 0 16px;
    }
    
    .nav-links {
        display: none;
    }
    
    .search-input {
        width: 200px;
    }
    
    .search-input:focus {
        width: 240px;
    }
    
    .hero {
        padding: 80px 16px;
    }
    
    .hero-title {
        font-size: 40px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-large {
        width: 100%;
        max-width: 300px;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .filter-categories {
        overflow-x: auto;
        flex-wrap: nowrap;
        -webkit-overflow-scrolling: touch;
    }
}

@media (max-width: 480px) {
    .header-right {
        gap: 8px;
    }
    
    .btn-secondary,
    .btn-primary {
        padding: 8px 12px;
        font-size: 13px;
    }
    
    .hero-title {
        font-size: 32px;
    }
}