/* ================================================================
   RESPONSIVE DESIGN SYSTEM
   Professional Breakpoints & Adaptive Layouts
   ================================================================ */

/* ================================================================
   DEVICE BREAKPOINTS & RESPONSIVE VARIABLES
   ================================================================ */
@media (max-width: 480px) {
    /* SMALL PHONES */
    :root {
        --spacing-xs: 4px;
        --spacing-sm: 8px;
        --spacing-md: 12px;
        --spacing-lg: 16px;
        --spacing-xl: 20px;
        --font-size-sm: 12px;
        --font-size-base: 14px;
        --font-size-lg: 16px;
        --border-radius: 8px;
        --header-height: 56px;
        --footer-height: 64px;
    }

    body {
        font-size: 14px;
        line-height: 1.5;
    }

    .container,
    .content {
        padding: 12px;
        max-width: 100%;
    }

    h1 {
        font-size: 24px;
        margin-bottom: 8px;
    }

    h2 {
        font-size: 20px;
        margin-bottom: 8px;
    }

    h3 {
        font-size: 18px;
        margin-bottom: 6px;
    }

    button,
    .btn {
        min-height: 44px;
        padding: 12px 16px;
        font-size: 14px;
    }

    .mobile-card {
        margin: 8px;
        padding: 12px;
    }

    .mobile-list-item {
        padding: 10px 12px;
    }
}

@media (max-width: 640px) {
    /* LARGE PHONES */
    :root {
        --spacing-xs: 6px;
        --spacing-sm: 10px;
        --spacing-md: 14px;
        --spacing-lg: 18px;
        --spacing-xl: 24px;
        --font-size-sm: 13px;
        --font-size-base: 15px;
        --font-size-lg: 17px;
        --border-radius: 10px;
    }

    .mobile-card {
        margin: 10px;
        padding: 14px;
    }

    .grid-cols-2 {
        grid-template-columns: 1fr 1fr !important;
        gap: 10px;
    }

    .mobile-profile-card {
        padding: 16px;
    }
}

@media (max-width: 768px) {
    /* TABLETS & SMALL TABLETS */
    :root {
        --spacing-xs: 8px;
        --spacing-sm: 12px;
        --spacing-md: 16px;
        --spacing-lg: 20px;
        --spacing-xl: 28px;
        --font-size-sm: 13px;
        --font-size-base: 15px;
        --font-size-lg: 18px;
        --border-radius: 12px;
    }

    .page-wrapper {
        padding: 0;
        margin: 0;
    }

    .mobile-sidebar {
        width: 280px;
    }

    .mobile-app-header {
        height: 60px;
        padding: 0 20px;
    }

    .mobile-bottom-nav {
        height: 70px;
    }

    /* Grid layouts for tablets */
    .grid-cols-3 {
        grid-template-columns: repeat(3, 1fr) !important;
        gap: 12px;
    }

    .grid-cols-2 {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 12px;
    }

    /* List adjustments */
    .mobile-list-item {
        padding: 14px 16px;
    }

    .mobile-message-bubble {
        max-width: 70%;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    /* TABLETS - LANDSCAPE */
    :root {
        --spacing-xs: 10px;
        --spacing-sm: 14px;
        --spacing-md: 18px;
        --spacing-lg: 24px;
        --spacing-xl: 32px;
        --font-size-sm: 14px;
        --font-size-base: 16px;
        --font-size-lg: 18px;
        --border-radius: 14px;
    }

    .main {
        margin-left: 300px !important;
    }

    .sidebar {
        width: 300px;
    }

    .mobile-sidebar {
        width: 320px;
    }

    /* Three column layout */
    .grid-cols-3 {
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
    }

    .two-column-layout {
        display: grid;
        grid-template-columns: 1fr 2fr;
        gap: 16px;
    }
}

@media (min-width: 1025px) {
    /* DESKTOP */
    :root {
        --spacing-xs: 12px;
        --spacing-sm: 16px;
        --spacing-md: 20px;
        --spacing-lg: 28px;
        --spacing-xl: 36px;
        --font-size-sm: 14px;
        --font-size-base: 16px;
        --font-size-lg: 18px;
        --border-radius: 16px;
    }

    .mobile-app-header,
    .mobile-bottom-nav,
    .mobile-sidebar {
        display: none !important;
    }

    body {
        display: flex;
    }

    .sidebar {
        width: 260px;
        position: sticky;
        top: 0;
        height: 100vh;
    }

    .main {
        flex: 1;
        margin-left: 0;
        padding: 28px 36px;
        max-width: 1400px;
    }

    .grid-cols-3 {
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
    }

    .grid-cols-4 {
        grid-template-columns: repeat(4, 1fr);
        gap: 20px;
    }

    .two-column-layout {
        display: grid;
        grid-template-columns: 1fr 3fr;
        gap: 24px;
    }

    .three-column-layout {
        display: grid;
        grid-template-columns: 1fr 2fr 1fr;
        gap: 24px;
    }
}

/* ================================================================
   TOUCH TARGET OPTIMIZATION
   ================================================================ */
@media (hover: none) and (pointer: coarse) {
    /* Mobile/Touch devices */
    button,
    a,
    .clickable {
        min-width: 44px;
        min-height: 44px;
        padding: 12px 16px;
    }

    /* Increase spacing between touch targets */
    .mobile-nav-item {
        min-height: 50px;
    }

    .mobile-list-item {
        min-height: 56px;
    }
}

/* ================================================================
   LANDSCAPE ORIENTATION FIXES
   ================================================================ */
@media (orientation: landscape) and (max-height: 600px) {
    .mobile-app-header {
        height: 48px;
        padding: 0 16px;
    }

    .mobile-bottom-nav {
        height: 48px;
    }

    .main-container,
    .main {
        top: 48px !important;
        bottom: 48px !important;
    }

    .auth-container,
    .login-container {
        padding: 8px 16px;
        min-height: auto;
    }

    h1 {
        font-size: 20px;
    }

    button {
        min-height: 40px;
        padding: 8px 16px;
    }

    .mobile-card {
        padding: 8px 12px;
        margin: 4px;
    }
}

/* ================================================================
   HIGH PIXEL DENSITY DEVICES (RETINA DISPLAYS)
   ================================================================ */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    /* Slightly thicker borders for better visibility */
    .mobile-card {
        border-width: 1.5px;
    }

    input,
    button {
        border-width: 1.5px;
    }

    /* Sharper text on retina */
    body {
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }
}

/* ================================================================
   SAFE AREA SUPPORT (NOTCH, HOME INDICATOR)
   ================================================================ */
@supports (padding: max(0px)) {
    body {
        padding-left: max(0px, env(safe-area-inset-left));
        padding-right: max(0px, env(safe-area-inset-right));
    }

    .mobile-app-header {
        padding-left: max(16px, env(safe-area-inset-left));
        padding-right: max(16px, env(safe-area-inset-right));
        padding-top: max(8px, env(safe-area-inset-top));
    }

    .mobile-bottom-nav {
        padding-left: max(16px, env(safe-area-inset-left));
        padding-right: max(16px, env(safe-area-inset-right));
        padding-bottom: max(8px, env(safe-area-inset-bottom));
    }
}

/* ================================================================
   DARK MODE & COLOR SCHEME
   ================================================================ */
@media (prefers-color-scheme: dark) {
    /* Already styled for dark mode by default */
}

@media (prefers-color-scheme: light) {
    body {
        background: #f5f5f7;
        color: #1a1a1a;
    }

    .mobile-card,
    .mobile-app-header,
    .mobile-bottom-nav {
        background: #ffffff;
        border-color: rgba(0, 0, 0, 0.1);
        color: #1a1a1a;
    }

    input {
        background: #f5f5f7;
        border-color: rgba(0, 0, 0, 0.1);
        color: #1a1a1a;
    }
}

/* ================================================================
   PRINT STYLES
   ================================================================ */
@media print {
    .mobile-app-header,
    .mobile-bottom-nav,
    .mobile-sidebar,
    button,
    .no-print {
        display: none !important;
    }

    body {
        background: white;
        color: black;
    }

    .mobile-card {
        page-break-inside: avoid;
        border: 1px solid black;
    }
}

/* ================================================================
   FALLBACK FOR BROWSERS WITHOUT MEDIA QUERIES
   ================================================================ */
.fallback-container {
    width: 100%;
    max-width: 100%;
    padding: 16px;
    margin: 0 auto;
}

/* ================================================================
   UTILITY CLASSES FOR RESPONSIVE DESIGN
   ================================================================ */
.hide-on-mobile {
    display: none !important;
}

@media (min-width: 769px) {
    .hide-on-mobile {
        display: block !important;
    }

    .show-on-mobile {
        display: none !important;
    }

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

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

@media (max-width: 768px) {
    .show-on-mobile {
        display: block !important;
    }

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

    .mobile-only {
        display: block !important;
    }
}

/* ================================================================
   FLEX & GRID UTILITIES
   ================================================================ */
.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.flex-column {
    display: flex;
    flex-direction: column;
}

.grid {
    display: grid;
}

@media (max-width: 768px) {
    .grid-auto {
        grid-template-columns: 1fr !important;
    }

    .grid-cols-2 {
        grid-template-columns: 1fr !important;
    }

    .grid-cols-3 {
        grid-template-columns: 1fr !important;
    }

    .grid-cols-4 {
        grid-template-columns: 1fr 1fr !important;
    }
}

/* ================================================================
   SPACING UTILITIES
   ================================================================ */
.gap-xs { gap: var(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

.p-xs { padding: var(--spacing-xs); }
.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }
.p-xl { padding: var(--spacing-xl); }

.m-xs { margin: var(--spacing-xs); }
.m-sm { margin: var(--spacing-sm); }
.m-md { margin: var(--spacing-md); }
.m-lg { margin: var(--spacing-lg); }
.m-xl { margin: var(--spacing-xl); }