/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(135deg, #1a1f2c, #2d3748, #1a1f2c);
    color: #e2e8f0;
    animation: gradient 15s ease infinite;
    min-height: 100vh;
    perspective: 1000px;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    background-size: 400% 400%;
}

@keyframes gradient {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* 导航栏样式 */
.nav-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.1);
    padding: 1rem 2rem;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
    z-index: 1000;
    transform-style: preserve-3d;
}

.site-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: #60a5fa;
    margin-right: 2rem;
    text-shadow: 0 0 10px rgba(96, 165, 250, 0.5);
}

.ad-banner {
    background: linear-gradient(90deg, #3b82f6, #60a5fa);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    color: white;
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.filter-btn {
    padding: 8px 16px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.05);
    color: #e2e8f0;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(5px);
}

.filter-btn.active {
    background: linear-gradient(90deg, #3b82f6, #60a5fa);
    color: white;
    border-color: transparent;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.menu-toggle {
    display: none;
    font-size: 1.5rem;
    color: #e2e8f0;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.menu-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* 侧边导航样式 */
.side-nav {
    position: fixed;
    left: 0;
    top: 70px;
    bottom: 0;
    width: 240px;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    overflow-y: auto;
    transform-style: preserve-3d;
    border-right: 1px solid rgba(255, 255, 255, 0.1);
}

.category-group {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.category-btn {
    padding: 12px 16px;
    border-radius: 8px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: left;
    background: rgba(255, 255, 255, 0.05);
    color: #e2e8f0;
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-weight: 600;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.95rem;
    transform-style: preserve-3d;
}

.category-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateZ(10px);
}

.category-btn.active {
    background: linear-gradient(90deg, #3b82f6, #60a5fa);
    color: #ffffff;
    border-color: transparent;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
    transform: translateZ(15px);
}

/* 卡片容器 */
.card-container {
    margin-left: 240px;
    margin-top: 70px;
    padding: 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    transform-style: preserve-3d;
    padding-bottom: 80px; /* 为底部导航留出空间 */
}

.card {
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 1.5rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    transform-style: preserve-3d;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    max-height: 200px;
}

.card:hover {
    transform: translateY(-8px) scale(1.03) rotateX(5deg);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(96, 165, 250, 0.4);
}

.card-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    transform: translateZ(20px);
}

.region-icon {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 1.2rem;
    transform: translateZ(15px);
}

.card h3 {
    color: #e2e8f0;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
    transform: translateZ(10px);
}

.card p {
    color: #94a3b8;
    font-size: 0.9rem;
    line-height: 1.5;
    transform: translateZ(5px);
}

/* 底部样式 */
footer {
    position: fixed;
    bottom: 0;
    left: 240px;
    right: 0;
    text-align: center;
    font-size: 0.85rem;
    background: rgba(26, 31, 44, 0.8);
    color: #a0aec0;
    padding: 0.8rem 0;
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(96, 165, 250, 0.2);
    letter-spacing: 0.5px;
    line-height: 1.4;
}

footer a {
    color: #60a5fa;
    text-decoration: none;
    transition: color 0.2s ease;
}

footer a:hover {
    color: #3b82f6;
    text-decoration: underline;
}

/* 3D效果动画 */
@keyframes float {
    0% { transform: translateY(0px) translateZ(0); }
    50% { transform: translateY(-10px) translateZ(20px); }
    100% { transform: translateY(0px) translateZ(0); }
}

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

/* 响应式布局 */
@media (max-width: 1024px) {
    .card-container {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 1.5rem;
        padding: 1.5rem;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    .side-nav {
        position: fixed;
        left: -240px;
        top: 70px;
        bottom: 0;
        width: 240px;
        transition: left 0.3s ease;
        z-index: 999;
        background: rgba(26, 31, 44, 0.95);
        backdrop-filter: blur(10px);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

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

    .card-container {
        margin-left: 0;
        margin-top: 70px;
        padding: 1rem;
        padding-bottom: 70px; /* 为底部导航留出空间 */
    }

    .nav-header {
        padding: 0.8rem 1rem;
    }

    .site-title {
        margin-right: auto;
    }


    footer {
        left: 0;
        padding: 0.6rem 0;
        z-index: 997;
        font-size: 0.8rem;
    }

    .card {
        padding: 1.2rem;
        animation: none;
        max-height: 150px;
    }

    .card:hover {
        transform: translateY(-4px) scale(1.02);
    }

    .card-icon {
        font-size: 1.8rem;
    }

    .card h3 {
        font-size: 1rem;
    }

    .card p {
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    .card-container {
        grid-template-columns: 1fr;
        padding: 0.8rem;
        gap: 1rem;
        padding-bottom: 60px; /* 为底部导航留出空间 */
    }

    .card {
        padding: 1rem;
    }

    .nav-header {
        padding: 0.6rem 0.8rem;
    }

    .site-title {
        font-size: 1.2rem;
    }

    .menu-toggle {
        font-size: 1.3rem;
    }

    footer {
        padding: 0.5rem 0;
        font-size: 0.75rem;
    }
}

/* 移动端遮罩层 */
.mobile-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    z-index: 998;
}

.mobile-overlay.active {
    display: block;
}