.bottom-nav {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    height: 60px;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(30px) saturate(180%);
    -webkit-backdrop-filter: blur(30px) saturate(180%);
    border-top: 1px solid rgba(255, 255, 255, 0.3);
    border-left: 1px solid rgba(255, 255, 255, 0.2);
    border-right: 1px solid rgba(255, 255, 255, 0.2);
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: 1000;
    box-shadow: 
        0 -8px 32px rgba(0, 0, 0, 0.1),
        0 -1px 0 rgba(255, 255, 255, 0.4) inset,
        0 1px 0 rgba(0, 0, 0, 0.05) inset;
    border-radius: 20px 20px 0 0;
}
.nav-item {
    flex: 1;
    text-align: center;
    color: #8e8e93;
    font-size: 12px;
    font-weight: 500;
    padding: 8px 0 4px 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    position: relative;
    border-radius: 12px;
    margin: 0 4px;
}
.nav-item:hover {
    color: #0A5AA8;
    transform: translateY(-1px);
}
.nav-item.active {
    color: #0A5AA8;
    transform: translateY(-1px);
}
.nav-item:focus {
    outline: none;
}
.nav-icon {
    display: block;
    font-size: 22px;
    margin-bottom: 4px;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.1));
}
.nav-item:hover .nav-icon {
    transform: scale(1.05);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.15));
}
.nav-item.active .nav-icon {
    transform: scale(1.05);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}