/* ============================================
   RESPONSIVE UTILITIES & COMPONENTS
   Ultra Mobile-First Design System
   ============================================ */

:root {
    /* Responsive spacing scale */
    --spacing-xs: clamp(4px, 1vw, 8px);
    --spacing-sm: clamp(8px, 2vw, 12px);
    --spacing-md: clamp(12px, 3vw, 16px);
    --spacing-lg: clamp(16px, 4vw, 24px);
    --spacing-xl: clamp(24px, 5vw, 32px);
    --spacing-2xl: clamp(32px, 6vw, 48px);
    
    /* Responsive font sizes */
    --font-xs: clamp(10px, 2vw, 12px);
    --font-sm: clamp(12px, 2.5vw, 14px);
    --font-base: clamp(14px, 3vw, 16px);
    --font-lg: clamp(16px, 3.5vw, 18px);
    --font-xl: clamp(18px, 4vw, 24px);
    --font-2xl: clamp(22px, 5vw, 32px);
    --font-3xl: clamp(28px, 6vw, 48px);
}

/* ============================================
   RESPONSIVE CONTAINER
   ============================================ */

.container-fluid {
    padding-left: var(--spacing-sm);
    padding-right: var(--spacing-sm);
}

@media (min-width: 576px) {
    .container-fluid {
        padding-left: var(--spacing-md);
        padding-right: var(--spacing-md);
    }
}

@media (min-width: 768px) {
    .container-fluid {
        padding-left: var(--spacing-lg);
        padding-right: var(--spacing-lg);
    }
}

@media (min-width: 1024px) {
    .container-fluid {
        padding-left: var(--spacing-xl);
        padding-right: var(--spacing-xl);
    }
}

/* ============================================
   RESPONSIVE GRID IMPROVEMENTS
   ============================================ */

.row {
    margin-left: calc(var(--spacing-sm) * -1);
    margin-right: calc(var(--spacing-sm) * -1);
}

@media (min-width: 768px) {
    .row {
        margin-left: calc(var(--spacing-md) * -1);
        margin-right: calc(var(--spacing-md) * -1);
    }
}

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

@media (min-width: 768px) {
    .col {
        padding-left: var(--spacing-md);
        padding-right: var(--spacing-md);
    }
}

/* ============================================
   RESPONSIVE SPACING UTILITIES
   ============================================ */

.p-responsive {
    padding: var(--spacing-md);
}

.m-responsive {
    margin: var(--spacing-md);
}

.gap-responsive {
    gap: var(--spacing-lg);
}

@media (min-width: 768px) {
    .p-responsive {
        padding: var(--spacing-lg);
    }
    
    .m-responsive {
        margin: var(--spacing-lg);
    }
    
    .gap-responsive {
        gap: var(--spacing-xl);
    }
}

/* ============================================
   RESPONSIVE TYPOGRAPHY
   ============================================ */

.display-responsive {
    font-size: var(--font-3xl);
    line-height: 1.2;
    font-weight: 700;
}

.h1-responsive {
    font-size: var(--font-2xl);
}

.h2-responsive {
    font-size: var(--font-xl);
}

.h3-responsive {
    font-size: var(--font-lg);
}

.text-responsive {
    font-size: var(--font-base);
}

.text-small-responsive {
    font-size: var(--font-sm);
}

/* ============================================
   RESPONSIVE IMAGES
   ============================================ */

.img-fluid {
    max-width: 100%;
    height: auto;
    display: block;
}

.img-thumbnail {
    max-width: 100%;
    padding: clamp(2px, 1vw, 4px);
}

.aspect-ratio-16-9 {
    aspect-ratio: 16 / 9;
    overflow: hidden;
}

.aspect-ratio-1-1 {
    aspect-ratio: 1 / 1;
    overflow: hidden;
}

@media (max-width: 576px) {
    .img-thumbnail {
        max-width: 100%;
        height: auto;
    }
}

/* ============================================
   RESPONSIVE NAVBAR IMPROVEMENTS
   ============================================ */

.navbar {
    padding-top: clamp(0.5rem, 1vw, 1rem);
    padding-bottom: clamp(0.5rem, 1vw, 1rem);
}

.navbar-brand {
    font-size: clamp(1.1rem, 3vw, 1.5rem);
    margin-right: auto;
}

.navbar-nav {
    gap: clamp(0, 1vw, 8px);
}

.navbar-nav .nav-link {
    padding: clamp(0.25rem, 1vw, 0.5rem) clamp(0.5rem, 1.5vw, 1rem) !important;
    font-size: clamp(0.85rem, 2vw, 1rem);
}

/* Mobile navbar collapse */
@media (max-width: 991px) {
    .navbar-collapse {
        margin-top: var(--spacing-md);
        border-top: 1px solid var(--border-light);
        padding-top: var(--spacing-md);
    }
}

/* ============================================
   RESPONSIVE BUTTONS
   ============================================ */

.btn-responsive {
    padding: clamp(8px, 2vw, 12px) clamp(16px, 3vw, 24px);
    font-size: clamp(0.9rem, 2vw, 1rem);
}

.btn-responsive.btn-sm {
    padding: clamp(4px, 1vw, 6px) clamp(8px, 2vw, 12px);
    font-size: clamp(0.8rem, 1.5vw, 0.9rem);
}

.btn-responsive.btn-lg {
    padding: clamp(12px, 2.5vw, 14px) clamp(24px, 4vw, 32px);
    font-size: clamp(1rem, 2.5vw, 1.25rem);
}

/* ============================================
   RESPONSIVE FORMS
   ============================================ */

.form-control-responsive {
    padding: clamp(8px, 1.5vw, 10px) clamp(12px, 2vw, 14px);
    font-size: clamp(0.9rem, 2vw, 1rem);
}

.form-label-responsive {
    font-size: clamp(0.9rem, 2vw, 1rem);
    margin-bottom: clamp(4px, 1vw, 8px);
}

.input-group-responsive .input-group-text {
    padding: clamp(8px, 1.5vw, 10px) clamp(10px, 1.5vw, 12px);
}

/* ============================================
   RESPONSIVE CARDS
   ============================================ */

.card-responsive {
    border-radius: clamp(6px, 1vw, 12px);
    margin-bottom: clamp(12px, 2vw, 20px);
}

.card-body-responsive {
    padding: clamp(16px, 3vw, 24px);
}

.card-header-responsive {
    padding: clamp(14px, 2.5vw, 20px);
    font-size: clamp(1rem, 2vw, 1.25rem);
}

/* ============================================
   RESPONSIVE TABLES
   ============================================ */

.table-responsive-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

@media (max-width: 576px) {
    .table {
        font-size: var(--font-sm);
    }
    
    .table thead th,
    .table tbody td {
        padding: clamp(6px, 1vw, 8px) clamp(4px, 1vw, 6px);
    }
    
    .table thead {
        font-size: clamp(0.8rem, 1.5vw, 0.9rem);
    }
}

@media (min-width: 577px) {
    .table {
        font-size: var(--font-base);
    }
    
    .table thead th,
    .table tbody td {
        padding: clamp(10px, 1.5vw, 12px) clamp(8px, 1.5vw, 10px);
    }
}

/* ============================================
   RESPONSIVE MODALS
   ============================================ */

.modal-dialog {
    margin: clamp(8px, 2vw, 20px) auto;
}

@media (max-width: 576px) {
    .modal-dialog {
        max-width: 95vw !important;
        width: 95vw !important;
    }
    
    .modal-body {
        padding: clamp(12px, 2vw, 16px);
    }
}

/* ============================================
   RESPONSIVE SIDEBARS
   ============================================ */

.sidebar-responsive {
    display: none;
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
}

@media (min-width: 992px) {
    .sidebar-responsive {
        display: flex;
        position: relative;
        background: transparent;
    }
}

/* ============================================
   RESPONSIVE FOOTER
   ============================================ */

footer {
    padding: clamp(24px, 5vw, 48px) clamp(12px, 2vw, 24px);
    margin-top: clamp(32px, 6vw, 64px);
}

footer .row > [class*="col"] {
    margin-bottom: clamp(16px, 3vw, 24px);
}

@media (min-width: 768px) {
    footer .row > [class*="col"] {
        margin-bottom: 0;
    }
}

/* ============================================
   RESPONSIVE ALERTS
   ============================================ */

.alert-responsive {
    padding: clamp(12px, 2vw, 16px);
    font-size: clamp(0.9rem, 1.5vw, 1rem);
    border-left-width: clamp(3px, 0.5vw, 4px);
}

/* ============================================
   TOUCH-FRIENDLY TARGETS
   ============================================ */

@media (hover: none) and (pointer: coarse) {
    /* Mobile/touch devices */
    .btn,
    .nav-link,
    .form-check-input,
    a {
        min-height: 44px;
        min-width: 44px;
        padding: clamp(8px, 2vw, 12px) clamp(12px, 2vw, 16px);
    }
    
    .btn:active {
        transform: scale(0.98);
    }
}

/* ============================================
   RESPONSIVE DISPLAY UTILITIES
   ============================================ */

.d-none-mobile {
    display: none;
}

@media (min-width: 768px) {
    .d-none-mobile {
        display: block !important;
    }
    
    .d-none-desktop {
        display: none !important;
    }
}

.d-none-desktop {
    display: block;
}

/* ============================================
   RESPONSIVE TEXT UTILITIES
   ============================================ */

.text-truncate-responsive {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

@media (max-width: 576px) {
    .text-center-mobile {
        text-align: center;
    }
}

/* ============================================
   RESPONSIVE VISIBILITY
   ============================================ */

@media (max-width: 374px) {
    .hide-xs { display: none !important; }
}

@media (min-width: 375px) and (max-width: 576px) {
    .hide-sm { display: none !important; }
}

@media (min-width: 577px) and (max-width: 768px) {
    .hide-md { display: none !important; }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .hide-lg { display: none !important; }
}

@media (min-width: 1025px) {
    .hide-xl { display: none !important; }
}