/**
 * Mobile Navigation Standard
 * Standardized bottom nav positioning for iOS-style app prototype
 * RunSmart - Quantum Spatial Design System
 *
 * BEST PRACTICE: Nav fixed at bottom of .screen container (not browser window)
 * This ensures consistent behavior across all screens and viewport sizes
 */

/* Bottom Navigation - Standard Positioning */
.bottom-nav,
.tab-bar {
    position: fixed;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    width: 369px;
    max-width: calc(100% - 24px); /* Responsive fallback */
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(26, 26, 26, 0.8);
    border-radius: 24px;
    padding: 12px 20px;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-shadow:
        0 10px 30px rgba(0, 0, 0, 0.5),
        0 0 0 1px rgba(123, 0, 255, 0.1);
    z-index: 1000;
}

/* Nav Items */
.nav-item,
.tab-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    cursor: pointer;
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 12px;
    transition: all 0.2s ease;
    position: relative;
}

.nav-item:active,
.tab-item:active {
    transform: scale(0.95);
    background: rgba(123, 0, 255, 0.1);
}

/* Nav Icons */
.nav-icon,
.tab-icon {
    width: 24px;
    height: 24px;
    opacity: 0.5;
    transition: all 0.3s ease;
    color: #FFFFFF;
}

/* Nav Labels */
.nav-label,
.tab-label {
    font-size: 10px;
    color: #888;
    font-weight: 500;
    transition: all 0.3s ease;
}

/* Active State */
.nav-item.active .nav-icon,
.tab-item.active .tab-icon {
    opacity: 1;
    color: #7B00FF;
    filter: drop-shadow(0 0 8px rgba(123, 0, 255, 0.6));
}

.nav-item.active .nav-label,
.tab-item.active .tab-label {
    color: #FFFFFF;
    font-weight: 600;
}

/* Hover State (for desktop testing) */
@media (hover: hover) {
    .nav-item:hover,
    .tab-item:hover {
        background: rgba(123, 0, 255, 0.05);
    }

    .nav-item:hover .nav-icon,
    .tab-item:hover .tab-icon {
        opacity: 0.7;
    }
}

/* Safe Area Inset Support (iOS notch/home indicator) */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
    .bottom-nav,
    .tab-bar {
        padding-bottom: calc(12px + env(safe-area-inset-bottom));
    }
}

/* Ensure content doesn't get hidden behind nav */
.screen {
    padding-bottom: 100px; /* Space for nav */
}

.content {
    padding-bottom: 100px; /* Additional space for scrollable content */
}