/**
 * Hello Middleton - Mobile Navigation
 * Bottom navigation, menu sheets, and gesture interactions
 *
 * @version 2.2.0
 * @requires tokens.css
 */

/* =========================================================================
   MOBILE BOTTOM NAVIGATION
   Fixed app-like navigation at the bottom of the screen
   ========================================================================= */

.mobile-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--mobile-nav-height, 64px);
    display: flex;
    align-items: center;
    justify-content: space-around;
    background: var(--hm-bg-elevated);
    border-top: 1px solid var(--hm-border);
    padding-bottom: env(safe-area-inset-bottom, 0);
    z-index: var(--z-fixed);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.08);
}

/* Navigation items - Touch optimized */
.mobile-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-0-5);
    padding: var(--space-2) var(--space-3);
    min-width: 56px;
    min-height: 48px; /* Touch target minimum */
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    color: var(--hm-text-muted);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: color var(--duration-fast) var(--ease-out);
    touch-action: manipulation;
    -webkit-user-select: none;
    user-select: none;
}

/* Active state */
.mobile-nav-item.active {
    color: var(--hm-primary);
    font-weight: var(--font-semibold);
}

/* Tap feedback */
.mobile-nav-item:active {
    background: var(--hm-bg-subtle);
    transform: scale(0.95);
}

/* Navigation icons */
.mobile-nav-icon {
    font-size: 1.25rem;
    line-height: 1;
}

/* Elevated center "Post" button */
.mobile-nav-item.nav-post {
    position: relative;
    color: var(--hm-text-inverse);
    background: var(--hm-primary);
    border-radius: var(--radius-full);
    padding: var(--space-2) var(--space-4);
    margin-top: calc(-1 * var(--space-4));
    box-shadow: var(--shadow-md);
    min-width: auto;
}

.mobile-nav-item.nav-post:active {
    background: var(--hm-primary-hover);
    transform: scale(0.98);
}

/* =========================================================================
   MOBILE MENU SHEET
   Bottom sheet overlay for navigation menus
   ========================================================================= */

/* Backdrop overlay */
.mobile-menu-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    opacity: 0;
    visibility: hidden;
    transition:
        opacity var(--duration-normal) var(--ease-out),
        visibility var(--duration-normal) var(--ease-out);
    z-index: var(--z-modal-backdrop);
}

.mobile-menu-backdrop.open {
    opacity: 1;
    visibility: visible;
}

/* Sheet container */
.mobile-menu-sheet {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    max-height: 70vh;
    background: var(--hm-bg-elevated);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    box-shadow: var(--shadow-xl);
    transform: translateY(100%);
    transition: transform var(--duration-normal) var(--ease-out);
    z-index: var(--z-modal);
    overflow: hidden;
    padding-bottom: env(safe-area-inset-bottom, 0);
}

.mobile-menu-sheet.open {
    transform: translateY(0);
}

/* Sheet header */
.mobile-menu-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4);
    border-bottom: 1px solid var(--hm-border);
}

.mobile-menu-title {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--hm-text);
    margin: 0;
}

/* Close button */
.mobile-menu-close {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--hm-bg-subtle);
    border: none;
    border-radius: var(--radius-full);
    font-size: var(--text-lg);
    color: var(--hm-text-secondary);
    cursor: pointer;
    transition: background var(--duration-fast) var(--ease-out);
}

.mobile-menu-close:active {
    background: var(--hm-bg-muted);
}

/* Sheet content */
.mobile-menu-content {
    padding: var(--space-2) var(--space-3);
    overflow-y: auto;
    max-height: calc(70vh - 64px);
    -webkit-overflow-scrolling: touch;
}

/* Menu items */
.mobile-menu-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-base);
    color: var(--hm-text);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: background var(--duration-fast) var(--ease-out);
    min-height: 48px;
}

.mobile-menu-item:active {
    background: var(--hm-bg-subtle);
}

.mobile-menu-icon {
    font-size: 1.25rem;
    width: 28px;
    text-align: center;
    color: var(--hm-text-secondary);
}

/* Menu sections */
.mobile-menu-section {
    padding: var(--space-3) var(--space-4) var(--space-2);
}

.mobile-menu-section-title {
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    color: var(--hm-text-muted);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
}

/* =========================================================================
   LANDSCAPE ADJUSTMENTS
   ========================================================================= */

@media (max-height: 480px) and (orientation: landscape) {
    .mobile-bottom-nav {
        height: 48px;
    }

    .mobile-nav-item {
        flex-direction: row;
        gap: var(--space-1);
        padding: var(--space-1) var(--space-2);
    }

    .mobile-nav-item.nav-post {
        margin-top: calc(-1 * var(--space-2));
    }

    .mobile-menu-sheet {
        max-height: 60vh;
    }

    .mobile-menu-content {
        max-height: calc(60vh - 64px);
    }
}

/* =========================================================================
   HIDE ON DESKTOP
   ========================================================================= */

@media (min-width: 769px) {
    .mobile-bottom-nav,
    .mobile-menu-sheet,
    .mobile-menu-backdrop {
        display: none;
        visibility: hidden;
    }
}

/* =========================================================================
   SAFE AREA SUPPORT
   iOS notch and home indicator
   ========================================================================= */

@supports (padding: env(safe-area-inset-bottom)) {
    .mobile-bottom-nav {
        padding-bottom: calc(var(--space-2) + env(safe-area-inset-bottom));
    }

    .mobile-menu-sheet {
        padding-bottom: env(safe-area-inset-bottom);
    }
}