/* 💙 HeartTime - Material Design 3 Bottom Navigation Component */

/* ===== Bottom Navigation Bar ===== */

.m3-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--m3-nav-bar-height);
    background-color: var(--m3-surface);
    border-top: 1px solid var(--m3-outline-variant);
    display: flex;
    align-items: center;
    z-index: 1000;
    box-shadow: var(--m3-elevation-level2);
    
    /* Safe area support for devices with home indicator */
    padding-bottom: env(safe-area-inset-bottom, 0px);
    height: calc(var(--m3-nav-bar-height) + env(safe-area-inset-bottom, 0px));
}

/* ===== Navigation Items ===== */

.m3-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 48px; /* Touch target minimum */
    padding: var(--m3-space-2) var(--m3-space-1);
    cursor: pointer;
    transition: all var(--m3-motion-duration-short2) var(--m3-motion-easing-standard);
    color: var(--m3-on-surface-variant);
    text-decoration: none;
    border-radius: var(--m3-shape-corner-small);
    margin: 0 var(--m3-space-1);
    position: relative;
    overflow: hidden;
}

.m3-nav-item:hover {
    background-color: rgba(14, 165, 233, 0.08); /* Primary with 8% opacity */
}

.m3-nav-item:active {
    background-color: rgba(14, 165, 233, 0.12); /* Primary with 12% opacity */
    transform: scale(0.98);
}

.m3-nav-item.active {
    color: var(--m3-primary);
}

.m3-nav-item.active .m3-nav-icon {
    color: var(--m3-primary);
}

/* ===== Navigation Icons ===== */

.m3-nav-icon {
    font-size: 20px;
    margin-bottom: var(--m3-space-1);
    transition: all var(--m3-motion-duration-short2) var(--m3-motion-easing-standard);
}

/* ===== Navigation Labels ===== */

.m3-nav-label {
    font-size: var(--m3-label-small-font);
    line-height: var(--m3-label-small-line-height);
    font-weight: var(--m3-label-small-weight);
    letter-spacing: var(--m3-label-small-tracking);
    text-align: center;
    transition: all var(--m3-motion-duration-short2) var(--m3-motion-easing-standard);
}

/* ===== Ripple Effect ===== */

.m3-nav-item::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background-color: var(--m3-primary);
    opacity: 0.2;
    transform: translate(-50%, -50%);
    transition: width var(--m3-motion-duration-medium1) var(--m3-motion-easing-standard),
                height var(--m3-motion-duration-medium1) var(--m3-motion-easing-standard);
}

.m3-nav-item:active::before {
    width: 48px;
    height: 48px;
}

/* ===== More Menu ===== */

.m3-more-menu {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1001;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--m3-motion-duration-medium2) var(--m3-motion-easing-standard),
                visibility var(--m3-motion-duration-medium2) var(--m3-motion-easing-standard);
}

.m3-more-menu.expanded {
    pointer-events: all;
    opacity: 1;
    visibility: visible;
}

.m3-more-menu-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.32);
    opacity: 0;
    transition: opacity var(--m3-motion-duration-medium2) var(--m3-motion-easing-emphasized);
}

.m3-more-menu.expanded .m3-more-menu-backdrop {
    opacity: 1;
}

.m3-more-menu-content {
    position: absolute;
    bottom: calc(var(--m3-nav-bar-height) + env(safe-area-inset-bottom, 0px));
    left: var(--m3-space-4);
    right: var(--m3-space-4);
    background-color: var(--m3-surface);
    border-radius: var(--m3-shape-corner-large);
    box-shadow: var(--m3-elevation-level3);
    padding: var(--m3-space-2) 0;
    transform: translateY(calc(100% + var(--m3-space-4)));
    opacity: 0;
    transition: transform var(--m3-motion-duration-medium3) var(--m3-motion-easing-emphasized-decelerate),
                opacity var(--m3-motion-duration-medium2) var(--m3-motion-easing-standard);
}

.m3-more-menu.expanded .m3-more-menu-content {
    transform: translateY(0);
    opacity: 1;
}

/* Staggered animation for menu items */
.m3-more-menu-item {
    opacity: 0;
    transform: translateY(8px);
    transition: opacity var(--m3-motion-duration-short4) var(--m3-motion-easing-standard),
                transform var(--m3-motion-duration-short4) var(--m3-motion-easing-standard),
                background-color var(--m3-motion-duration-short2) var(--m3-motion-easing-standard);
}

.m3-more-menu.expanded .m3-more-menu-item {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered delays for smooth appearance */
.m3-more-menu.expanded .m3-more-menu-item:nth-child(1) { transition-delay: 50ms; }
.m3-more-menu.expanded .m3-more-menu-item:nth-child(2) { transition-delay: 100ms; }
.m3-more-menu.expanded .m3-more-menu-item:nth-child(3) { transition-delay: 150ms; }
.m3-more-menu.expanded .m3-more-menu-item:nth-child(4) { transition-delay: 200ms; }
.m3-more-menu.expanded .m3-more-menu-item:nth-child(5) { transition-delay: 250ms; }
.m3-more-menu.expanded .m3-more-menu-item:nth-child(6) { transition-delay: 300ms; }

/* ===== More Menu Items ===== */

.m3-more-menu-item {
    display: flex;
    align-items: center;
    padding: var(--m3-space-3) var(--m3-space-4);
    cursor: pointer;
    transition: background-color var(--m3-motion-duration-short2) var(--m3-motion-easing-standard);
    color: var(--m3-on-surface);
    text-decoration: none;
    min-height: 48px; /* Touch target minimum */
    position: relative;
    overflow: hidden;
}

.m3-more-menu-item:hover {
    background-color: rgba(31, 41, 55, 0.08); /* On-surface with 8% opacity */
}

.m3-more-menu-item:active {
    background-color: rgba(31, 41, 55, 0.12); /* On-surface with 12% opacity */
}

.m3-more-menu-item:first-child {
    border-radius: var(--m3-shape-corner-large) var(--m3-shape-corner-large) 0 0;
}

.m3-more-menu-item:last-child {
    border-radius: 0 0 var(--m3-shape-corner-large) var(--m3-shape-corner-large);
}

/* ===== More Menu Icons ===== */

.m3-more-icon {
    font-size: 20px;
    margin-right: var(--m3-space-4);
    color: var(--m3-on-surface-variant);
    width: 24px;
    text-align: center;
}

/* ===== More Menu Labels ===== */

.m3-more-label {
    font-size: var(--m3-body-large-font);
    line-height: var(--m3-body-large-line-height);
    font-weight: var(--m3-body-large-weight);
    letter-spacing: var(--m3-body-large-tracking);
    flex: 1;
}

/* ===== More Menu Divider ===== */

.m3-more-menu-divider {
    height: 1px;
    background-color: var(--m3-outline-variant);
    margin: var(--m3-space-2) var(--m3-space-4);
}

/* ===== Touch-specific Interactions ===== */

@media (hover: none) and (pointer: coarse) {
    .m3-nav-item:hover {
        background-color: transparent;
    }
    
    .m3-more-menu-item:hover {
        background-color: transparent;
    }
    
    .m3-nav-item:active {
        background-color: rgba(14, 165, 233, 0.12);
    }
    
    .m3-more-menu-item:active {
        background-color: rgba(31, 41, 55, 0.12);
    }
}

/* ===== Accessibility Enhancements ===== */

.m3-nav-item:focus,
.m3-more-menu-item:focus {
    outline: 2px solid var(--m3-primary);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .m3-bottom-nav {
        border-top: 2px solid var(--m3-outline);
    }
    
    .m3-nav-item.active {
        background-color: var(--m3-primary);
        color: var(--m3-on-primary);
    }
    
    .m3-nav-item.active .m3-nav-icon {
        color: var(--m3-on-primary);
    }
}

/* ===== Reduced Motion Support ===== */

@media (prefers-reduced-motion: reduce) {
    .m3-nav-item,
    .m3-nav-icon,
    .m3-nav-label,
    .m3-more-menu,
    .m3-more-menu-backdrop,
    .m3-more-menu-content,
    .m3-more-menu-item {
        transition: none;
    }
    
    .m3-nav-item::before {
        transition: none;
    }
}

/* ===== Responsive Adjustments ===== */

@media (max-width: 359px) {
    .m3-nav-label {
        font-size: 10px;
    }
    
    .m3-nav-icon {
        font-size: 18px;
    }
}

@media (min-width: 600px) {
    .m3-bottom-nav {
        display: none; /* Hide on tablet and desktop */
    }
    
    .m3-more-menu {
        display: none;
    }
}

/* ===== Animation Keyframes ===== */

@keyframes m3-ripple {
    0% {
        width: 0;
        height: 0;
        opacity: 0.2;
    }
    100% {
        width: 48px;
        height: 48px;
        opacity: 0;
    }
}

/* ===== Dark Mode Support (Future Enhancement) ===== */

@media (prefers-color-scheme: dark) {
    .m3-bottom-nav {
        background-color: var(--m3-surface);
        border-top-color: var(--m3-outline-variant);
    }
    
    .m3-more-menu-content {
        background-color: var(--m3-surface);
    }
}