/* Responsive Design CSS */

/* Mobile-first approach with progressive enhancement */

/* Base styles (mobile) */
:root {
    --sidebar-width-mobile: 100%;
    --sidebar-width-tablet: 280px;
    --sidebar-width-desktop: 320px;
    --header-height: 64px;
    --header-height-mobile: 56px;
}

/* Mobile Styles (default) - Fixed Height Layout */
@media (max-width: 767px) {
    /* Main container adjustments for mobile */
    .chat-main-container {
        height: 100vh;
        height: 100dvh; /* Use dynamic viewport height on mobile */
        overflow: hidden;
    }

    /* Header adjustments */
    .modern-sidebar {
        position: fixed;
        top: 0;
        left: -100%;
        width: var(--sidebar-width-mobile);
        height: 100vh;
        height: 100dvh; /* Use dynamic viewport height on mobile */
        z-index: 1000;
        transition: left var(--transition-normal);
        box-shadow: var(--shadow-xl);
        overflow-y: auto; /* Allow sidebar scrolling on mobile */
    }

    .modern-sidebar.open {
        left: 0;
    }

    .sidebar-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }

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

    /* Chat layout mobile - Fixed Height */
    .chat-content-area {
        grid-template-columns: 1fr !important;
        grid-template-rows: 1fr auto;
        gap: var(--spacing-sm);
        padding: var(--spacing-sm);
        height: 100%;
        overflow: hidden;
    }

    .texts-column {
        max-height: 250px;
        order: 2;
        overflow-y: auto; /* Enable scrolling on mobile */
    }

    .chat-column {
        order: 1;
        min-height: 0; /* Remove fixed min-height for proper flex behavior */
        height: 100%;
        overflow: hidden;
    }

    /* Mobile header */
    .modern-chat-header {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: flex-start;
        padding: var(--spacing-sm) 0;
    }

    .chat-header-actions {
        width: 100%;
        justify-content: space-between;
    }

    /* Mobile user menu */
    .modern-user-menu .d-none.d-md-block {
        display: none !important;
    }

    /* Mobile buttons */
    .modern-button {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.875rem;
    }

    /* Mobile cards */
    .modern-card {
        border-radius: var(--radius-lg);
        margin: var(--spacing-xs);
    }

    /* Mobile chat items */
    .modern-chat-item {
        padding: var(--spacing-sm);
    }

    .chat-title {
        max-width: 120px;
    }

    /* Mobile login */
    .modern-user-dropdown {
        min-width: 260px;
    }

    /* Touch-friendly sizing */
    .modern-chat-item,
    .modern-button,
    .modern-input {
        min-height: 44px; /* iOS recommended touch target */
    }

    /* Mobile typography */
    .text-2xl { font-size: 1.25rem; }
    .text-xl { font-size: 1.125rem; }
    .text-lg { font-size: 1rem; }

    /* Mobile spacing */
    .p-lg { padding: var(--spacing-md); }
    .p-xl { padding: var(--spacing-lg); }
    .gap-lg { gap: var(--spacing-md); }
    .gap-xl { gap: var(--spacing-lg); }
}

/* Tablet Styles */
@media (min-width: 768px) and (max-width: 1023px) {
    .modern-sidebar {
        width: var(--sidebar-width-tablet);
        position: relative;
        left: 0;
    }

    .chat-content-area {
        grid-template-columns: 1fr 300px;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
    }

    .texts-column {
        max-height: 400px;
    }

    .modern-chat-header {
        flex-direction: row;
        align-items: center;
    }

    .chat-title {
        max-width: 160px;
    }

    .modern-user-dropdown {
        min-width: 280px;
    }
}

/* Desktop Styles */
@media (min-width: 1024px) {
    .modern-sidebar {
        width: var(--sidebar-width-desktop);
        position: relative;
        left: 0;
    }

    .chat-content-area {
        grid-template-columns: 1fr 350px;
        gap: var(--spacing-lg);
        padding: var(--spacing-lg);
    }

    .texts-column {
        max-height: none;
    }

    .chat-title {
        max-width: 180px;
    }
}

/* Large Desktop Styles */
@media (min-width: 1440px) {
    .chat-content-area {
        grid-template-columns: 1fr 400px;
        gap: var(--spacing-xl);
        padding: var(--spacing-xl);
    }

    .modern-sidebar {
        width: 360px;
    }

    .chat-title {
        max-width: 220px;
    }
}

/* Landscape Mobile */
@media (max-width: 767px) and (orientation: landscape) {
    .chat-content-area {
        grid-template-columns: 1fr 250px;
        grid-template-rows: 1fr;
    }

    .texts-column {
        max-height: none;
        order: 2;
    }

    .chat-column {
        order: 1;
    }
}

/* High DPI / Retina displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .modern-card,
    .modern-chat-item,
    .modern-button {
        border-width: 0.5px;
    }
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Dark mode support (future-ready) - DISABLED to ensure dark elements are always visible */
/*
@media (prefers-color-scheme: dark) {
    :root {
        --neutral-50: #1f2937;
        --neutral-100: #374151;
        --neutral-200: #4b5563;
        --neutral-300: #6b7280;
        --neutral-400: #9ca3af;
        --neutral-500: #d1d5db;
        --neutral-600: #e5e7eb;
        --neutral-700: #f3f4f6;
        --neutral-800: #f9fafb;
        --neutral-900: #ffffff;
    }

    .modern-card,
    .modern-chat-item,
    .modern-sidebar {
        background: var(--neutral-100);
        border-color: var(--neutral-200);
    }

    .glass-effect {
        background: rgba(31, 41, 55, 0.9) !important;
        border-color: var(--neutral-200);
    }
}
*/

/* Print styles */
@media print {
    .modern-sidebar,
    .chat-header-actions,
    .modern-user-menu {
        display: none !important;
    }

    .chat-content-area {
        grid-template-columns: 1fr !important;
        gap: 0 !important;
        padding: 0 !important;
    }

    .modern-card,
    .modern-chat-item {
        box-shadow: none !important;
        border: 1px solid #ccc !important;
    }
}

/* Utility classes for responsive design */
.mobile-only {
    display: block;
}

.tablet-up {
    display: none;
}

.desktop-up {
    display: none;
}

@media (min-width: 768px) {
    .mobile-only {
        display: none;
    }
    
    .tablet-up {
        display: block;
    }
}

@media (min-width: 1024px) {
    .desktop-up {
        display: block;
    }
}

/* Touch-friendly improvements */
@media (hover: none) and (pointer: coarse) {
    .modern-chat-item:hover {
        transform: none;
    }
    
    .modern-chat-item:active {
        transform: scale(0.98);
        background: var(--primary-50);
    }
    
    .modern-button:hover {
        transform: none;
    }
    
    .modern-button:active {
        transform: scale(0.95);
    }
}

/* Focus improvements for keyboard navigation */
.modern-chat-item:focus,
.modern-button:focus,
.modern-input:focus {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

/* Safe area insets for devices with notches */
@supports (padding: max(0px)) {
    .modern-sidebar {
        padding-left: max(var(--spacing-md), env(safe-area-inset-left));
        padding-right: max(var(--spacing-md), env(safe-area-inset-right));
    }
    
    .chat-content-area {
        padding-left: max(var(--spacing-lg), env(safe-area-inset-left));
        padding-right: max(var(--spacing-lg), env(safe-area-inset-right));
    }
}