/* ===== RESPONSIVE UI/UX OPTIMIZATION MODULE ===== */
/* Mobile-First Approach - Optimize for all devices */

/* ===== 1. ROOT RESPONSIVE VARIABLES ===== */
:root {
    /* Mobile First - Base sizes */
    --page-padding: 1rem;
    --section-gap: 1.5rem;
    --card-gap: 1rem;
    --button-height: 2.75rem;
    --button-padding: 0.875rem 1rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 1.875rem;
    --font-size-3xl: 2.25rem;
    /* Touch targets minimum 44-48px */
    --touch-target: 3rem;
}

@media (min-width: 768px) {
    :root {
        --page-padding: 1.5rem;
        --section-gap: 2rem;
        --card-gap: 1.25rem;
        --font-size-sm: 0.875rem;
        --font-size-base: 1rem;
        --font-size-lg: 1.125rem;
        --font-size-xl: 1.5rem;
        --font-size-2xl: 2rem;
        --font-size-3xl: 2.5rem;
    }
}

@media (min-width: 1024px) {
    :root {
        --page-padding: 2rem;
        --section-gap: 2.5rem;
        --card-gap: 1.5rem;
        --font-size-xl: 1.75rem;
        --font-size-2xl: 2.25rem;
        --font-size-3xl: 3rem;
    }
}

/* ===== 2. RESPONSIVE GRID SYSTEM ===== */
.responsive-grid {
    display: grid;
    gap: var(--card-gap);
    grid-template-columns: 1fr;
}

/* Tablet: 2 columns */
@media (min-width: 640px) {
    .responsive-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .responsive-grid-no-wrap {
        grid-template-columns: 1fr;
    }
}

/* Desktop: 3 columns */
@media (min-width: 1024px) {
    .responsive-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Desktop XL: 4 columns */
@media (min-width: 1280px) {
    .responsive-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Full-width card classes */
.card-full { grid-column: 1 / -1; }
@media (min-width: 768px) {
    .card-lg { grid-column: span 2; }
}
@media (min-width: 1024px) {
    .card-lg { grid-column: span 2; }
    .card-xl { grid-column: span 3; }
}

/* ===== 3. RESPONSIVE CONTAINERS ===== */
.container-responsive {
    width: 100%;
    max-width: 100%;
    padding: var(--page-padding);
    margin: 0 auto;
}

@media (min-width: 640px) {
    .container-responsive {
        max-width: 640px;
        margin: 0 auto;
    }
}

@media (min-width: 768px) {
    .container-responsive {
        max-width: 768px;
    }
}

@media (min-width: 1024px) {
    .container-responsive {
        max-width: 1024px;
    }
}

@media (min-width: 1280px) {
    .container-responsive {
        max-width: 1280px;
    }
}

/* ===== 4. TYPOGRAPHY RESPONSIVE ===== */
h1 { font-size: var(--font-size-2xl); line-height: 1.3; }
h2 { font-size: var(--font-size-xl); line-height: 1.4; }
h3 { font-size: var(--font-size-lg); line-height: 1.4; }
p { font-size: var(--font-size-base); line-height: 1.6; }
small { font-size: var(--font-size-sm); }

@media (min-width: 768px) {
    h1 { font-size: var(--font-size-3xl); }
    h2 { font-size: var(--font-size-2xl); }
    h3 { font-size: var(--font-size-lg); }
}

/* ===== 5. TOUCH-FRIENDLY BUTTONS ===== */
button, .btn, input[type="button"], input[type="submit"] {
    min-height: var(--touch-target);
    padding: var(--button-padding);
    font-size: var(--font-size-base);
    border-radius: 0.75rem;
    transition: all 0.2s ease;
    touch-action: manipulation;
}

button:active, .btn:active {
    transform: scale(0.98);
}

@media (hover: hover) {
    button:hover, .btn:hover {
        transform: translateY(-2px);
    }
}

/* ===== 6. RESPONSIVE INPUTS ===== */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="url"],
textarea,
select {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border-color, rgba(255,255,255,0.1));
    min-height: var(--touch-target);
    -webkit-appearance: none;
    appearance: none;
}

textarea {
    min-height: 6rem;
    resize: vertical;
}

@media (max-width: 767px) {
    input, textarea, select {
        font-size: 16px; /* Prevents zoom on iOS */
    }
}

/* ===== 7. RESPONSIVE MODALS ===== */
.modal-responsive {
    width: 100%;
    max-width: calc(100vw - 2rem);
    max-height: 90vh;
    border-radius: 1rem;
}

@media (min-width: 640px) {
    .modal-responsive {
        max-width: 500px;
    }
}

@media (min-width: 768px) {
    .modal-responsive {
        max-width: 600px;
        border-radius: 1.5rem;
    }
}

@media (min-width: 1024px) {
    .modal-responsive {
        max-width: 700px;
    }
}

/* ===== 8. RESPONSIVE FLEX LAYOUTS ===== */
.flex-responsive {
    display: flex;
    flex-direction: column;
    gap: var(--card-gap);
}

@media (min-width: 640px) {
    .flex-responsive {
        flex-direction: row;
    }
    .flex-responsive > * {
        flex: 1;
    }
}

/* ===== 9. RESPONSIVE SECTION PADDING ===== */
section, .section-responsive {
    padding: var(--section-gap) var(--page-padding);
}

@media (min-width: 768px) {
    section, .section-responsive {
        padding: var(--section-gap) var(--page-padding);
    }
}

/* ===== 10. MOBILE MENU SPACING ===== */
@media (max-width: 767px) {
    /* Extra bottom padding for fixed mobile navigation */
    main, .main-content {
        padding-bottom: 7rem;
    }

    body.chat-active {
        overflow: hidden;
    }
}

/* ===== 11. RESPONSIVE TABLES ===== */
table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
    overflow-x: auto;
    display: block;
}

@media (min-width: 768px) {
    table {
        font-size: var(--font-size-base);
        display: table;
    }
}

thead, tbody, tfoot, tr, td, th {
    display: block;
}

@media (min-width: 768px) {
    thead, tbody, tfoot, tr, td, th {
        display: table-cell;
    }
}

tfoot {
    display: none;
}

@media (min-width: 768px) {
    tfoot {
        display: table-footer-group;
    }
}

td, th {
    padding: 0.75rem;
    border: 1px solid rgba(255,255,255,0.1);
}

@media (max-width: 767px) {
    tr {
        margin-bottom: 1rem;
        display: block;
        border: 1px solid rgba(255,255,255,0.1);
        border-radius: 0.5rem;
        padding: 0.75rem;
    }

    td {
        display: block;
        text-align: right;
        padding-left: 50%;
        position: relative;
    }

    td:before {
        content: attr(data-label);
        position: absolute;
        left: 0;
        font-weight: bold;
        text-align: left;
    }
}

/* ===== 12. RESPONSIVE IMAGES ===== */
img, video, canvas {
    max-width: 100%;
    height: auto;
    display: block;
}

picture {
    display: block;
}

/* ===== 13. RESPONSIVE SPACING UTILITIES ===== */
.gap-responsive { gap: var(--card-gap); }
.p-responsive { padding: var(--page-padding); }
.p-section { padding: var(--section-gap) var(--page-padding); }
.m-responsive { margin: var(--card-gap); }

/* ===== 14. HIDE/SHOW RESPONSIVE ===== */
.hide-mobile {
    display: none !important;
}

.hide-tablet {
    display: block !important;
}

.hide-desktop {
    display: block !important;
}

@media (min-width: 640px) {
    .hide-tablet {
        display: none !important;
    }
}

@media (min-width: 1024px) {
    .hide-desktop {
        display: none !important;
    }
}

@media (min-width: 768px) {
    .hide-mobile {
        display: block !important;
    }
}

/* ===== 15. ORIENTATION ===== */
@media (orientation: landscape) and (max-height: 500px) {
    .hide-landscape {
        display: none !important;
    }

    /* Reduce padding on landscape mobile */
    :root {
        --page-padding: 0.75rem;
        --section-gap: 1rem;
    }
}

/* ===== 16. SAFE AREA / NOTCH SUPPORT ===== */
@supports (padding: max(0px)) {
    body {
        padding-left: max(1rem, env(safe-area-inset-left));
        padding-right: max(1rem, env(safe-area-inset-right));
        padding-top: max(1rem, env(safe-area-inset-top));
        padding-bottom: max(1rem, env(safe-area-inset-bottom));
    }

    .safe-area-top {
        padding-top: max(0.5rem, env(safe-area-inset-top));
    }

    .safe-area-bottom {
        padding-bottom: max(0.5rem, env(safe-area-inset-bottom));
    }
}

/* ===== 17. PERFORMANCE: SMOOTH SCROLLING ===== */
html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===== 18. RESPONSIVE PRINT STYLES ===== */
@media print {
    * {
        background: transparent !important;
        color: black !important;
        text-shadow: none !important;
        box-shadow: none !important;
    }

    button, a[href]:after {
        cursor: default;
    }

    .no-print {
        display: none !important;
    }

    body {
        padding: 0;
        margin: 0;
    }
}

/* ===== 19. ACCESSIBILITY IMPROVEMENTS ===== */
:focus-visible {
    outline: 3px solid var(--neon-cyan, #C084FC);
    outline-offset: 2px;
    border-radius: 0.25rem;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    box-shadow: 0 0 0 3px rgba(192, 132, 252, 0.35);
}

/* ===== 20. RESPONSIVE Z-INDEX STACK ===== */
.z-mobile-nav { z-index: 99; }
.z-modal { z-index: 100; }
.z-modal-backdrop { z-index: 99; }
.z-tooltip { z-index: 101; }
.z-notification { z-index: 102; }

/* ===== BREAKPOINT REFERENCE ===== */
/*
Mobile: < 640px
Tablet: 640px - 1023px
Desktop: 1024px - 1279px
Desktop XL: >= 1280px

Common breakpoints:
- 320px: Small phone
- 375px: iPhone
- 425px: Medium phone
- 640px: Large phone/Tablet start
- 768px: Tablet
- 1024px: Desktop
- 1280px: Large desktop
- 1536px: XL desktop
*/