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

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

/* 导航栏样式 */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo h2 {
    color: #333;
    font-weight: 700;
    font-size: 1.5rem;
}

/* 收藏按钮样式 */
.bookmark-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 15px;
    background: linear-gradient(135deg, #ff6b6b, #ee5a24);
    color: white;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(255, 107, 107, 0.3);
}

.bookmark-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.5);
}

.bookmark-icon {
    font-size: 1.1rem;
}

.bookmark-text {
    font-size: 0.85rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 10px 15px;
    border-radius: 25px;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    transform: translateY(-2px);
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* 主要内容区域 */
.main-content {
    margin-top: 70px;
    min-height: calc(100vh - 70px);
}

/* 页脚样式 */
.footer {
    background: rgba(0, 0, 0, 0.9);
    color: white;
    margin-top: 50px;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.footer-section h3 {
    color: #667eea;
    font-size: 1.3rem;
    margin-bottom: 15px;
    font-weight: 600;
}

.footer-section p {
    line-height: 1.6;
    margin-bottom: 10px;
    color: #ccc;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section li {
    color: #ccc;
    margin-bottom: 8px;
    padding-left: 20px;
    position: relative;
}

.footer-section li::before {
    content: "•";
    color: #667eea;
    position: absolute;
    left: 0;
}

.footer-bottom {
    background: rgba(0, 0, 0, 0.95);
    text-align: center;
    padding: 20px;
    border-top: 1px solid #333;
}

.footer-bottom p {
    margin: 0;
    color: #999;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

/* 卡片样式 */
.card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: rgba(255, 255, 255, 0.95);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        backdrop-filter: blur(10px);
        padding: 20px 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .hamburger {
        display: flex;
    }

    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .nav-container {
        padding: 0 15px;
    }

    .nav-logo h2 {
        font-size: 1.2rem;
    }
    
    .bookmark-btn {
        padding: 6px 12px;
        font-size: 0.8rem;
    }
    
    .bookmark-text {
        display: none;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        padding: 30px 15px;
        gap: 20px;
    }
}

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

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

.pulse {
    animation: pulse 2s infinite;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #5a6fd8, #6a4190);
}