/* Mobile-First Responsive CSS Framework for MyConnectionHub Portal */

/* ========================================
   Base Variables and Reset
   ======================================== */
:root {
    /* Colors */
    --primary-blue: #1e3a8a;
    --primary-blue-light: #3b82f6;
    --primary-blue-dark: #1e40af;
    --secondary-gray: #6b7280;
    --background-light: #f9fafb;
    --white: #ffffff;
    --text-dark: #111827;
    --text-gray: #6b7280;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Touch targets */
    --touch-target-min: 44px;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    
    /* Z-index layers */
    --z-mobile-nav: 1000;
    --z-mobile-header: 900;
    --z-drawer-overlay: 1100;
    --z-drawer: 1200;
}

/* ========================================
   Mobile-First Base Styles
   ======================================== */
* {
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    overscroll-behavior: none;
    -webkit-overflow-scrolling: touch;
}

/* ========================================
   Utility Classes
   ======================================== */

/* Visibility Classes */
.mobile-only {
    display: block !important;
}

.desktop-only {
    display: none !important;
}

.tablet-only {
    display: none !important;
}

/* Touch-Friendly Elements */
.touch-friendly {
    min-height: var(--touch-target-min);
    min-width: var(--touch-target-min);
    padding: var(--spacing-sm);
    cursor: pointer;
}

.touch-friendly-link {
    display: inline-flex;
    align-items: center;
    min-height: var(--touch-target-min);
    padding: var(--spacing-sm) var(--spacing-md);
}

/* Mobile Padding */
.mobile-padding {
    padding: var(--spacing-sm);
}

.mobile-padding-x {
    padding-left: var(--spacing-sm);
    padding-right: var(--spacing-sm);
}

.mobile-padding-y {
    padding-top: var(--spacing-sm);
    padding-bottom: var(--spacing-sm);
}

/* Mobile Stack */
.mobile-stack {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* Mobile Grid */
.mobile-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
}

/* ========================================
   Mobile Navigation Styles
   ======================================== */
.mobile-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    z-index: var(--z-mobile-nav);
    display: flex;
    justify-content: space-around;
    align-items: center;
    height: 60px;
    padding-bottom: env(safe-area-inset-bottom);
}

.mobile-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-gray);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.mobile-nav-item i {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

.mobile-nav-item span {
    font-size: 0.75rem;
}

/* Mobile Header */
.mobile-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: var(--z-mobile-header);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-sm);
    padding-top: env(safe-area-inset-top);
}

.mobile-header-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-dark);
}

/* Hamburger Menu */
.hamburger-menu {
    width: 30px;
    height: 24px;
    position: relative;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.hamburger-menu span {
    display: block;
    height: 3px;
    width: 100%;
    background: var(--text-dark);
    border-radius: 2px;
    transition: all var(--transition-normal);
}

.hamburger-menu.active span:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

.hamburger-menu.active span:nth-child(2) {
    opacity: 0;
}

.hamburger-menu.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* Mobile Drawer */
.mobile-drawer-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: var(--z-drawer-overlay);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.mobile-drawer-overlay.active {
    opacity: 1;
    visibility: visible;
}

.mobile-drawer {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 280px;
    max-width: 85vw;
    background: var(--white);
    z-index: var(--z-drawer);
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.mobile-drawer.active {
    transform: translateX(0);
}

/* ========================================
   Mobile Form Styles
   ======================================== */
.mobile-form input,
.mobile-form select,
.mobile-form textarea {
    width: 100%;
    min-height: 48px;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 16px; /* Prevents zoom on iOS */
    border: 1px solid #d1d5db;
    border-radius: 0.5rem;
    transition: border-color var(--transition-fast);
}

.mobile-form input:focus,
.mobile-form select:focus,
.mobile-form textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.mobile-form button {
    width: 100%;
    min-height: 48px;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
    font-weight: 600;
    border-radius: 0.5rem;
    transition: all var(--transition-fast);
}

/* ========================================
   Mobile Card Styles
   ======================================== */
.mobile-card {
    background: var(--white);
    border-radius: 0.75rem;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.mobile-card-compact {
    padding: var(--spacing-sm);
}

/* ========================================
   Mobile Chart Container
   ======================================== */
.mobile-chart-container {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.mobile-chart-wrapper {
    min-width: 320px;
    height: 250px;
}

/* ========================================
   Mobile Safe Areas
   ======================================== */
.safe-area-top {
    padding-top: env(safe-area-inset-top);
}

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

.safe-area-left {
    padding-left: env(safe-area-inset-left);
}

.safe-area-right {
    padding-right: env(safe-area-inset-right);
}

/* ========================================
   Floating Action Button
   ======================================== */
.fab {
    position: fixed;
    bottom: 80px;
    right: 20px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--primary-blue);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    cursor: pointer;
    transition: all var(--transition-fast);
    z-index: 800;
}

.fab:active {
    transform: scale(0.95);
}

.fab i {
    font-size: 1.5rem;
}

/* ========================================
   Loading States
   ======================================== */
.skeleton-loader {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

/* ========================================
   Pull to Refresh
   ======================================== */
.pull-to-refresh {
    position: absolute;
    top: -60px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.pull-to-refresh.active {
    position: fixed;
    top: 80px;
}

/* ========================================
   Tablet Styles (768px - 1023px)
   ======================================== */
@media (min-width: 768px) {
    .mobile-only {
        display: none !important;
    }
    
    .tablet-only {
        display: block !important;
    }
    
    .mobile-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
    
    .mobile-padding {
        padding: var(--spacing-md);
    }
    
    .mobile-card {
        padding: var(--spacing-lg);
    }
    
    .mobile-drawer {
        width: 320px;
    }
}

/* ========================================
   Desktop Styles (1024px+)
   ======================================== */
@media (min-width: 1024px) {
    .mobile-only,
    .tablet-only {
        display: none !important;
    }
    
    .desktop-only {
        display: block !important;
    }
    
    .mobile-nav,
    .mobile-header {
        display: none;
    }
    
    .mobile-stack {
        flex-direction: row;
        gap: var(--spacing-md);
    }
    
    .mobile-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-lg);
    }
    
    .mobile-form input,
    .mobile-form select,
    .mobile-form textarea {
        font-size: 14px;
    }
}

/* ========================================
   Animations
   ======================================== */
.slide-in-bottom {
    animation: slideInBottom 0.3s ease-out;
}

@keyframes slideInBottom {
    from {
        transform: translateY(100%);
    }
    to {
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* ========================================
   Accessibility
   ======================================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus visible for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}