:root {
    --primary-color: #286aff;
    --secondary-color: #5f27cd;
    --text-color: #333;
    --inactive-color: #95a5a6;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', sans-serif;
    padding-bottom: 70px; /* 为底部导航留出空间 */
}

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-around;
    background: white;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: 10px 0;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--inactive-color);
    font-size: 12px;
    transition: all 0.3s ease;
}

.nav-item i {
    font-size: 22px;
    margin-bottom: 4px;
}

.nav-item.active {
    color: var(--primary-color);
    transform: translateY(-5px);
}

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

.content {
    padding: 20px;
    min-height: 100vh;
}

@media (min-width: 768px) {
    .bottom-nav {
        max-width: 500px;
        margin: 0 auto;
        border-radius: 25px 25px 0 0;
    }
}