/* ========================================
   BTICT Design System - Unified CSS
   Brand: Bangladesh Training Institute
   Primary: Deep Forest Green #0d4a2a
   ======================================== */

/* ===== DESIGN TOKENS ===== */
:root {
    /* Brand Colors */
    --bt-primary: #0d4a2a;
    --bt-primary-600: #0a3b21;
    --bt-primary-400: #1b5e3d;
    --bt-primary-50: #e8f3ec;
    --bt-accent: #ffca28;
    --bt-accent-600: #e0b000;
    --bt-secondary: var(--bt-accent);

    /* Semantic Colors */
    --bt-success: #198754;
    --bt-success-light: #d1e7dd;
    --bt-danger: #dc3545;
    --bt-danger-light: #f8d7da;
    --bt-warning: #ffc107;
    --bt-warning-light: #fff3cd;
    --bt-info: #0dcaf0;
    --bt-info-light: #cff4fc;

    /* Neutral Colors */
    --bt-white: #ffffff;
    --bt-gray-50: #f8f9fa;
    --bt-gray-100: #f8f9fa;
    --bt-gray-200: #e9ecef;
    --bt-gray-300: #dee2e6;
    --bt-gray-400: #ced4da;
    --bt-gray-500: #adb5bd;
    --bt-gray-600: #6c757d;
    --bt-gray-700: #495057;
    --bt-gray-800: #343a40;
    --bt-gray-900: #212529;

    /* Surface Colors */
    --bt-bg: #f4f6f8;
    --bt-surface: #ffffff;
    --bt-surface-hover: #f8f9fa;
    --bt-border: #dee2e6;
    --bt-border-light: #e9ecef;
    --bt-border-focus: #0d4a2a;

    /* Text Colors */
    --bt-text-primary: #212529;
    --bt-text-secondary: #495057;
    --bt-text-muted: #6c757d;
    --bt-text-light: #adb5bd;
    --bt-text-on-primary: #ffffff;
    --bt-text-on-dark: #ffffff;

    /* Shadow System */
    --bt-shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --bt-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.1);
    --bt-shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --bt-shadow-lg: 0 8px 24px rgba(0,0,0,0.1);
    --bt-shadow-xl: 0 16px 48px rgba(0,0,0,0.12);

    /* Border Radius */
    --bt-radius-sm: 0.375rem;
    --bt-radius: 0.5rem;
    --bt-radius-lg: 0.75rem;
    --bt-radius-pill: 999px;

    /* Typography */
    --bt-font-family: 'Hind Siliguri', 'Noto Sans Bengali', 'Segoe UI', system-ui, -apple-system, sans-serif;
    --bt-font-size-xs: 0.75rem;
    --bt-font-size-sm: 0.875rem;
    --bt-font-size-base: 1rem;
    --bt-font-size-lg: 1.125rem;
    --bt-font-size-xl: 1.25rem;
    --bt-font-size-2xl: 1.5rem;
    --bt-font-size-3xl: 2rem;
    --bt-font-size-4xl: 2.5rem;
    --bt-font-weight-normal: 400;
    --bt-font-weight-medium: 500;
    --bt-font-weight-semibold: 600;
    --bt-font-weight-bold: 700;
    --bt-line-height-tight: 1.25;
    --bt-line-height-normal: 1.6;
    --bt-line-height-relaxed: 1.75;

    /* Spacing Scale */
    --bt-space-1: 0.25rem;
    --bt-space-2: 0.5rem;
    --bt-space-3: 0.75rem;
    --bt-space-4: 1rem;
    --bt-space-5: 1.5rem;
    --bt-space-6: 2rem;
    --bt-space-8: 3rem;
    --bt-space-10: 4rem;
    --bt-space-12: 5rem;

    /* Layout Dimensions */
    --bt-sidebar-width: 264px;
    --bt-sidebar-collapsed: 72px;
    --bt-header-height: 60px;
    --bt-container-max: 1320px;

    /* Z-Index Scale */
    --bt-z-dropdown: 1000;
    --bt-z-sticky: 1020;
    --bt-z-modal-backdrop: 1030;
    --bt-z-modal: 1040;
    --bt-z-popover: 1050;
    --bt-z-tooltip: 1060;
    --bt-z-toast: 1090;
    --bt-z-drawer-backdrop: 1030;
    --bt-z-drawer: 1040;

    /* Transitions */
    --bt-transition-fast: 150ms ease;
    --bt-transition-normal: 250ms ease;
    --bt-transition-slow: 350ms ease;

    /* Breakpoints (for reference) */
    --bt-breakpoint-sm: 576px;
    --bt-breakpoint-md: 768px;
    --bt-breakpoint-lg: 992px;
    --bt-breakpoint-xl: 1200px;
    --bt-breakpoint-xxl: 1400px;
}

.auth-locale-switcher {
    z-index: var(--bt-z-sticky);
}

/* Map Bootstrap variables to BTICT tokens */
:root {
    --bs-primary: var(--bt-primary);
    --bs-primary-rgb: 13, 74, 42;
    --bs-primary-text: var(--bt-text-on-primary);
    --bs-primary-bg-subtle: var(--bt-primary-50);
    --bs-primary-border-subtle: var(--bt-primary-400);
    --bs-link-color: var(--bt-primary);
    --bs-link-hover-color: var(--bt-primary-400);
    --bs-body-font-family: var(--bt-font-family);
    --bs-body-bg: var(--bt-bg);
    --bs-body-color: var(--bt-text-primary);
    --bs-border-color: var(--bt-border);
    --bs-border-radius: var(--bt-radius);
    --bs-border-radius-sm: var(--bt-radius-sm);
    --bs-border-radius-lg: var(--bt-radius-lg);
    --bs-border-radius-pill: var(--bt-radius-pill);
}

/* ===== BASE STYLES ===== */
body {
    font-family: var(--bt-font-family);
    font-size: var(--bt-font-size-base);
    line-height: var(--bt-line-height-normal);
    color: var(--bt-text-primary);
    background-color: var(--bt-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

html,
body {
    width: 100%;
    min-width: 320px;
    overflow-x: clip;
}

/* Typography Scale */
h1, .h1 {
    font-size: var(--bt-font-size-4xl);
    font-weight: var(--bt-font-weight-bold);
    line-height: var(--bt-line-height-tight);
}

h2, .h2 {
    font-size: var(--bt-font-size-3xl);
    font-weight: var(--bt-font-weight-bold);
    line-height: var(--bt-line-height-tight);
}

h3, .h3 {
    font-size: var(--bt-font-size-2xl);
    font-weight: var(--bt-font-weight-semibold);
    line-height: var(--bt-line-height-tight);
}

h4, .h4 {
    font-size: var(--bt-font-size-xl);
    font-weight: var(--bt-font-weight-semibold);
    line-height: var(--bt-line-height-tight);
}

h5, .h5 {
    font-size: var(--bt-font-size-lg);
    font-weight: var(--bt-font-weight-semibold);
    line-height: var(--bt-line-height-normal);
}

h6, .h6 {
    font-size: var(--bt-font-size-base);
    font-weight: var(--bt-font-weight-semibold);
    line-height: var(--bt-line-height-normal);
}

.text-sm { font-size: var(--bt-font-size-sm); }
.text-xs { font-size: var(--bt-font-size-xs); }
.text-lg { font-size: var(--bt-font-size-lg); }

.fw-normal { font-weight: var(--bt-font-weight-normal); }
.fw-medium { font-weight: var(--bt-font-weight-medium); }
.fw-semibold { font-weight: var(--bt-font-weight-semibold); }
.fw-bold { font-weight: var(--bt-font-weight-bold); }

/* Bengali text optimization */
.bn-text {
    font-family: 'Hind Siliguri', 'Noto Sans Bengali', var(--bt-font-family);
    line-height: var(--bt-line-height-relaxed);
}

/* Focus visible for accessibility */
*:focus-visible {
    outline: 3px solid var(--bt-primary-400);
    outline-offset: 2px;
}

/* ===== PORTAL LAYOUT ===== */
.portal-wrapper {
    min-height: 0;
}

.portal-body {
    position: relative;
}

.portal-main {
    padding-top: var(--bt-space-4);
    padding-bottom: var(--bt-space-8);
    width: 100%;
}

/* Desktop sidebar */
.portal-sidebar-desktop {
    position: sticky;
    top: var(--bt-header-height);
    height: calc(100vh - var(--bt-header-height));
    width: var(--bt-sidebar-width);
    flex-shrink: 0;
    border-right: 1px solid var(--bt-border);
    overflow-y: auto;
    overflow-x: hidden;
    min-height: 0;
}

/* Mobile drawer */
.portal-drawer-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.45);
    z-index: var(--bt-z-drawer-backdrop);
    display: none;
    opacity: 0;
    transition: opacity var(--bt-transition-normal), display var(--bt-transition-normal);
}

.portal-drawer-backdrop.show {
    display: block;
    opacity: 1;
}

.portal-drawer-backdrop[aria-hidden="true"] {
    display: none;
    opacity: 0;
}

.portal-sidebar-mobile {
    position: fixed;
    inset: var(--bt-header-height) 0 auto 0;
    height: calc(100vh - var(--bt-header-height));
    height: calc(100dvh - var(--bt-header-height));
    width: var(--bt-sidebar-width);
    max-width: 80vw;
    background: var(--bt-surface);
    border-right: 1px solid var(--bt-border);
    z-index: var(--bt-z-drawer);
    transform: translateX(-100%);
    transition: transform var(--bt-transition-normal);
    display: none;
    overflow-y: auto;
    box-shadow: var(--bt-shadow-lg);
}

.portal-sidebar-mobile.show {
    display: block;
    transform: translateX(0);
}

.portal-sidebar-mobile[aria-hidden="true"] {
    display: none;
}

.portal-drawer-header .btn-link {
    color: inherit;
    min-width: 44px;
    min-height: 44px;
}

.navbar .btn[data-portal-toggle="drawer"] {
    min-width: 44px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.portal-navbar {
    min-height: var(--bt-header-height);
}

.portal-navbar > .container {
    flex-wrap: nowrap;
    gap: var(--bt-space-2);
}

.portal-navbar .navbar-brand {
    display: flex;
    align-items: center;
    min-width: 0;
    flex: 1 1 0%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.portal-navbar .navbar-brand > .bi {
    flex: 0 0 auto;
}

.portal-navbar .navbar-brand > span {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.portal-navbar-actions {
    flex: 0 0 auto;
}

.portal-navbar-actions .nav-link {
    min-height: 44px;
    padding-inline: var(--bt-space-2);
}

.portal-navbar-actions .avatar-sm {
    width: 2rem;
    height: 2rem;
    flex: 0 0 2rem;
}

.portal-drawer-nav .nav-link {
    display: block;
    padding: var(--bt-space-2) var(--bt-space-4);
    border-radius: var(--bt-radius);
    margin-bottom: var(--bt-space-1);
}

.portal-drawer-nav .nav-link.active {
    background: var(--bt-primary);
    color: var(--bt-text-on-primary);
}

/* Ensure body scroll is locked when drawer open */
body.drawer-open,
body[style*="overflow: hidden"] {
    overflow: hidden !important;
}

/* Desktop: keep main content aligned under header, no sidebar overlap */
@media (min-width: 992px) {
    .portal-body {
        display: flex;
    }
    .portal-main {
        flex: 1;
        min-width: 0;
    }
}

/* Tablet/mobile: full width content */
@media (max-width: 991.98px) {
    .portal-main {
        padding-top: var(--bt-space-3);
    }
    .portal-main > .container {
        padding-left: var(--bt-space-3);
        padding-right: var(--bt-space-3);
    }
}

/* ===== COMPONENTS ===== */

/* Buttons */
.btn {
    border-radius: var(--bt-radius);
    font-weight: var(--bt-font-weight-medium);
    transition: all var(--bt-transition-normal);
}

.btn-primary {
    background: var(--bt-primary);
    border-color: var(--bt-primary);
    color: var(--bt-text-on-primary);
}

.btn-primary:hover {
    background: var(--bt-primary-400);
    border-color: var(--bt-primary-400);
    color: var(--bt-text-on-primary);
}

.btn-primary:focus {
    background: var(--bt-primary-400);
    border-color: var(--bt-primary-400);
    box-shadow: 0 0 0 0.25rem rgba(var(--bs-primary-rgb), 0.25);
}

.bg-primary {
    background-color: var(--bt-primary) !important;
}

.text-primary {
    color: var(--bt-primary) !important;
}

.border-primary {
    border-color: var(--bt-primary) !important;
}

.page-header {
    padding-bottom: var(--bt-space-4);
    margin-bottom: var(--bt-space-5) !important;
    border-bottom: 1px solid var(--bt-border);
}

.btn-outline-primary {
    background: transparent;
    border-color: var(--bt-primary);
    color: var(--bt-primary);
}

.btn-outline-primary:hover {
    background: var(--bt-primary);
    color: var(--bt-text-on-primary);
}

.btn-accent {
    background: var(--bt-accent);
    border-color: var(--bt-accent);
    color: var(--bt-text-primary);
}

.btn-accent:hover {
    background: var(--bt-accent-600);
    border-color: var(--bt-accent-600);
    color: var(--bt-text-primary);
}

.btn-accent:focus {
    background: var(--bt-accent-600);
    border-color: var(--bt-accent-600);
    box-shadow: 0 0 0 0.25rem rgba(255 202 40 / 0.25);
}

.btn-outline-accent {
    background: transparent;
    border-color: var(--bt-accent);
    color: var(--bt-accent);
}

.btn-outline-accent:hover {
    background: var(--bt-accent);
    color: var(--bt-text-primary);
}

.btn-custom {
    padding: 0.75rem 1.875rem;
    border-radius: var(--bt-radius-pill);
    font-weight: var(--bt-font-weight-semibold);
    transition: all var(--bt-transition-normal);
}

.btn-custom:hover {
    transform: translateY(-2px);
    box-shadow: var(--bt-shadow-md);
}

/* Cards */
.card {
    border-radius: var(--bt-radius-lg);
    border: 1px solid var(--bt-border);
    box-shadow: var(--bt-shadow-sm);
    transition: box-shadow var(--bt-transition-normal);
}

.card:hover {
    box-shadow: var(--bt-shadow);
}

.bt-card-hover {
    transition: transform var(--bt-transition-normal), box-shadow var(--bt-transition-normal);
}

.bt-card-hover:hover {
    transform: translateY(-2px);
    box-shadow: var(--bt-shadow-md);
}

.card-header {
    border-bottom: 1px solid var(--bt-border-light);
    background: var(--bt-surface);
    border-radius: var(--bt-radius-lg) var(--bt-radius-lg) 0 0;
}

.card-footer {
    border-top: 1px solid var(--bt-border-light);
    background: var(--bt-surface);
    border-radius: 0 0 var(--bt-radius-lg) var(--bt-radius-lg);
}

/* Course cards */
.course-card {
    border: none;
    border-radius: var(--bt-radius-lg);
    overflow: hidden;
    box-shadow: var(--bt-shadow);
    transition: transform var(--bt-transition-normal), box-shadow var(--bt-transition-normal);
    height: 100%;
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--bt-shadow-lg);
}

.course-card .card-img-top {
    height: 200px;
    object-fit: cover;
}

.course-card .card-body {
    padding: var(--bt-space-6);
}

.course-card .card-title {
    font-weight: var(--bt-font-weight-semibold);
    color: var(--bt-text-primary);
    margin-bottom: var(--bt-space-2);
}

.course-card .card-text {
    color: var(--bt-text-muted);
    font-size: var(--bt-font-size-sm);
}

.course-card .price {
    font-size: var(--bt-font-size-xl);
    font-weight: var(--bt-font-weight-bold);
    color: var(--bt-success);
}

/* Status badges */
.bt-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--bt-space-1);
    padding: 0.35rem 0.75rem;
    border-radius: var(--bt-radius-pill);
    font-size: var(--bt-font-size-sm);
    font-weight: var(--bt-font-weight-semibold);
    line-height: var(--bt-line-height-tight);
    white-space: nowrap;
    background: var(--bt-gray-100);
    color: var(--bt-gray-700);
}

.bt-badge-sm {
    padding: 0.2rem 0.5rem;
    font-size: var(--bt-font-size-xs);
}

.bt-badge-md {
    padding: 0.35rem 0.75rem;
}

.bt-badge-lg {
    padding: 0.45rem 0.875rem;
    font-size: var(--bt-font-size-base);
}

.bt-badge-default {
    background: var(--bt-gray-100);
    color: var(--bt-gray-700);
}

.bt-badge-primary {
    background: var(--bt-primary-50);
    color: var(--bt-primary);
}

.bt-badge-success {
    background: var(--bt-success-light);
    color: #0f5132;
}

.bt-badge-danger {
    background: var(--bt-danger-light);
    color: #842029;
}

.bt-badge-warning {
    background: var(--bt-warning-light);
    color: #664d03;
}

.bt-badge-info {
    background: var(--bt-info-light);
    color: #055160;
}

.bt-badge-dark {
    background: var(--bt-gray-800);
    color: var(--bt-white);
}

.bt-badge-dot {
    width: 0.375rem;
    height: 0.375rem;
    flex: 0 0 0.375rem;
    border-radius: var(--bt-radius-pill);
    background: currentColor;
    opacity: 0.7;
}

.bt-badge-remove {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.25rem;
    height: 1.25rem;
    color: currentColor;
    transition: background-color var(--bt-transition-fast);
}

.bt-badge-remove:hover {
    background: rgba(0, 0, 0, 0.1) !important;
}

.bt-badge-pending {
    background: var(--bt-warning-light);
    color: #856404;
}

.bt-badge-approved,
.bt-badge-active,
.bt-badge-paid,
.bt-badge-completed,
.bt-badge-published,
.bt-badge-valid {
    background: var(--bt-success-light);
    color: #0f5132;
}

.bt-badge-rejected,
.bt-badge-cancelled,
.bt-badge-failed,
.bt-badge-revoked,
.bt-badge-inactive {
    background: var(--bt-danger-light);
    color: #842029;
}

.bt-badge-draft {
    background: var(--bt-info-light);
    color: #055160;
}

.bt-icon-bg-primary {
    background: var(--bt-primary-50);
    color: var(--bt-primary);
}

.bt-icon-bg-success {
    background: var(--bt-success-light);
    color: var(--bt-success);
}

.bt-icon-bg-warning {
    background: var(--bt-warning-light);
    color: #856404;
}

.bt-icon-bg-info {
    background: var(--bt-info-light);
    color: #055160;
}

.bt-icon-bg-danger {
    background: var(--bt-danger-light);
    color: var(--bt-danger);
}

.page-header-icon {
    width: 2.5rem;
    height: 2.5rem;
    flex: 0 0 2.5rem;
}

.metric-card-icon {
    width: 3rem;
    height: 3rem;
    flex: 0 0 3rem;
}

/* Hero section */
.hero-section {
    background: linear-gradient(135deg, var(--bt-primary), var(--bt-primary-400));
    color: var(--bt-text-on-primary);
    padding: 6.25rem 0;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="%23ffffff" fill-opacity="0.1" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,122.7C672,117,768,139,864,138.7C960,139,1056,117,1152,122.7C1248,128,1344,160,1392,176L1440,192L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>');
    background-size: cover;
    background-position: bottom;
}

.hero-title {
    font-size: var(--bt-font-size-4xl);
    font-weight: var(--bt-font-weight-bold);
    margin-bottom: var(--bt-space-6);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.hero-subtitle {
    font-size: var(--bt-font-size-xl);
    opacity: 0.95;
    margin-bottom: var(--bt-space-8);
}

/* Counter section */
.counter-section {
    padding: var(--bt-space-10) 0;
    background: var(--bt-gray-50);
}

.counter-card {
    text-align: center;
    padding: var(--bt-space-8);
    border-radius: var(--bt-radius-lg);
    background: var(--bt-surface);
    box-shadow: var(--bt-shadow);
    transition: transform var(--bt-transition-normal);
}

.counter-card:hover {
    transform: translateY(-5px);
}

.counter-number {
    font-size: var(--bt-font-size-3xl);
    font-weight: var(--bt-font-weight-bold);
    color: var(--bt-primary);
}

/* Feature cards */
.feature-card {
    text-align: center;
    padding: var(--bt-space-8);
    border-radius: var(--bt-radius-lg);
    background: var(--bt-surface);
    box-shadow: var(--bt-shadow);
    transition: transform var(--bt-transition-normal);
    height: 100%;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: var(--bt-font-size-4xl);
    color: var(--bt-primary);
    margin-bottom: var(--bt-space-4);
}

/* Notice ticker */
.notice-ticker {
    background: var(--bt-warning);
    color: var(--bt-text-primary);
    padding: var(--bt-space-2) 0;
    overflow: hidden;
}

.notice-ticker .ticker-wrap {
    display: flex;
    animation: ticker 30s linear infinite;
}

@keyframes ticker {
    0% { transform: translateX(100%); }
    100% { transform: translateX(-100%); }
}

/* Testimonial cards */
.testimonial-card {
    background: var(--bt-surface);
    padding: var(--bt-space-8);
    border-radius: var(--bt-radius-lg);
    box-shadow: var(--bt-shadow);
    margin-bottom: var(--bt-space-6);
}

.testimonial-text {
    font-style: italic;
    color: var(--bt-text-muted);
    margin-bottom: var(--bt-space-4);
}

.testimonial-author {
    font-weight: var(--bt-font-weight-semibold);
    color: var(--bt-text-primary);
}

/* Gallery items */
.gallery-item {
    border-radius: var(--bt-radius-lg);
    overflow: hidden;
    box-shadow: var(--bt-shadow);
    transition: transform var(--bt-transition-normal);
}

.gallery-item:hover {
    transform: scale(1.05);
}

.gallery-item img {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

/* Footer */
.footer {
    background: var(--bt-gray-900);
    color: var(--bt-white);
    padding: var(--bt-space-12) 0 var(--bt-space-4);
}

.footer h5 {
    color: var(--bt-white);
    margin-bottom: var(--bt-space-4);
}

.footer a {
    color: var(--bt-gray-500);
    text-decoration: none;
    transition: color var(--bt-transition-normal);
}

.footer a:hover {
    color: var(--bt-white);
}

/* Section titles */
.section-title {
    font-size: var(--bt-font-size-3xl);
    font-weight: var(--bt-font-weight-bold);
    margin-bottom: var(--bt-space-8);
    text-align: center;
    color: var(--bt-text-primary);
}

.section-subtitle {
    text-align: center;
    color: var(--bt-text-muted);
    margin-bottom: var(--bt-space-12);
}

/* ===== UTILITIES ===== */
main,
.portal-main,
.container,
.row > *,
.card,
.modal-content {
    min-width: 0;
}

img,
video,
iframe,
canvas {
    max-width: 100%;
}

.table-responsive {
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.table-responsive > .table {
    min-width: 100%;
}

pre,
code {
    overflow-wrap: anywhere;
}

/* ===== RESPONSIVE DESIGN ===== */

/* Mobile (320-575px) */
@media (max-width: 575.98px) {
    .portal-navbar > .container {
        gap: var(--bt-space-1);
        padding-inline: var(--bt-space-2);
    }

    .portal-navbar .navbar-brand {
        margin-inline: var(--bt-space-1) !important;
    }

    .portal-navbar-actions {
        gap: var(--bt-space-1) !important;
    }

    .portal-navbar-actions > .btn {
        padding-inline: var(--bt-space-2);
    }

    .hero-title {
        font-size: var(--bt-font-size-2xl);
    }

    .hero-subtitle {
        font-size: var(--bt-font-size-base);
    }

    .counter-number {
        font-size: var(--bt-font-size-2xl);
    }

    .card-body {
        padding: var(--bt-space-4);
    }

    .btn-custom {
        padding: var(--bt-space-2) var(--bt-space-4);
        font-size: var(--bt-font-size-sm);
    }

    .hero-section {
        padding: var(--bt-space-10) 0;
    }

    .section-title {
        font-size: var(--bt-font-size-xl);
    }

    .navbar-brand {
        font-size: var(--bt-font-size-sm);
        max-width: calc(100% - 3.5rem);
        overflow-wrap: anywhere;
    }

    .nav-link {
        padding: var(--bt-space-2) var(--bt-space-3);
        font-size: var(--bt-font-size-sm);
    }

    .portal-main > .container,
    main > .container {
        padding-right: var(--bt-space-3);
        padding-left: var(--bt-space-3);
    }

    .navbar > .container {
        flex-wrap: wrap;
    }

    .btn,
    .form-control,
    .form-select {
        max-width: 100%;
    }

    .table-sm th,
    .table-sm td {
        padding: var(--bt-space-2);
        white-space: nowrap;
    }

    .table-responsive {
        border: none;
    }

    .badge {
        font-size: 0.7rem;
        padding: var(--bt-space-1) var(--bt-space-2);
    }

    .list-group-item {
        padding: var(--bt-space-2) 0;
    }
}

/* Tablet (576-991px) */
@media (max-width: 991.98px) {
    .hero-title {
        font-size: var(--bt-font-size-3xl);
    }

    .counter-number {
        font-size: var(--bt-font-size-2xl);
    }

    .card-body {
        padding: var(--bt-space-4);
    }

    .card-header {
        padding: var(--bt-space-3) var(--bt-space-4);
        font-size: var(--bt-font-size-sm);
    }

    .btn-custom {
        padding: var(--bt-space-2) var(--bt-space-5);
        font-size: var(--bt-font-size-sm);
    }

    .form-control,
    .form-select {
        font-size: var(--bt-font-size-base); /* Prevents zoom on iOS */
    }

    .input-group-text {
        font-size: var(--bt-font-size-sm);
    }

    .btn:not(.btn-sm):not(.btn-lg) {
        padding: var(--bt-space-2) var(--bt-space-4);
        font-size: var(--bt-font-size-sm);
    }

    .btn-lg {
        padding: var(--bt-space-3) var(--bt-space-6);
        font-size: var(--bt-font-size-base);
    }

    .btn-sm {
        padding: var(--bt-space-1) var(--bt-space-2);
        font-size: var(--bt-font-size-sm);
    }

    .card h2 {
        font-size: var(--bt-font-size-2xl) !important;
    }

    .card .fs-3 {
        font-size: var(--bt-font-size-xl) !important;
    }

    canvas {
        max-height: 250px !important;
        max-width: 100%;
    }

    .navbar-brand {
        font-size: var(--bt-font-size-lg);
    }
}

/* Desktop (992px+) */
@media (min-width: 992px) {
    /* Desktop-specific styles if needed */
}

/* Large desktop (1200px+) */
@media (min-width: 1200px) {
    /* Large desktop-specific styles if needed */
}

/* Extra large desktop (1400px+) */
@media (min-width: 1400px) {
    /* Extra large desktop-specific styles if needed */
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
    .portal-drawer-backdrop,
    .portal-sidebar-mobile,
    .card,
    .course-card,
    .counter-card,
    .feature-card,
    .gallery-item,
    .btn-custom {
        transition: none;
    }

    .notice-ticker .ticker-wrap {
        animation: none;
    }
}

/* ===== AUTH LAYOUT ===== */
.admin-login-page {
    min-height: 100vh;
    padding: var(--bt-space-4);
    background: linear-gradient(135deg, var(--bt-primary), var(--bt-primary-600));
}

.admin-login-card {
    width: 100%;
    max-width: 28rem;
    border: 1px solid rgba(255, 255, 255, 0.45);
    box-shadow: var(--bt-shadow-xl);
}

.admin-login-card .card-body {
    padding: clamp(1.5rem, 5vw, 2.5rem);
}

.admin-login-card .card-title {
    color: var(--bt-primary);
}

.top-bar {
    background: var(--bt-primary);
}

.main-header {
    width: 100%;
}

.main-header .container {
    min-width: 0;
}

.brand-logo,
.brand-mark {
    width: 44px;
    height: 44px;
    flex: 0 0 44px;
}

.brand-logo {
    object-fit: contain;
}

.brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--bt-radius);
    background: var(--bt-primary);
    color: var(--bt-text-on-primary);
    font-size: var(--bt-font-size-sm);
    font-weight: var(--bt-font-weight-bold);
}

.brand-text {
    min-width: 0;
}

.brand-name,
.brand-subtitle {
    overflow-wrap: anywhere;
}

.brand-subtitle {
    max-width: 220px;
    font-size: var(--bt-font-size-xs);
}

.landing-search {
    min-width: 0;
}

.landing-search .form-control {
    min-width: 0;
}

@media (max-width: 991.98px) {
    .main-header .navbar-brand {
        max-width: calc(100% - 4rem);
        white-space: normal;
    }

    .main-header .navbar-collapse {
        flex-basis: 100%;
    }

    .main-header .navbar-nav {
        align-items: stretch !important;
    }
}

.auth-body {
    background: linear-gradient(135deg, var(--bt-primary), var(--bt-primary-400));
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--bt-font-family);
}

/* ===== SHARED SPACING AND SURFACE REFINEMENTS ===== */
:root {
    --bt-section-gap: clamp(1rem, 2vw, 1.5rem);
    --bt-control-height: 2.75rem;
}

.portal-main {
    padding-block: clamp(1.5rem, 2.5vw, 2.25rem) var(--bt-space-8);
}

.portal-main > .container {
    max-width: var(--bt-container-max);
}

.portal-main > .container,
main > .container {
    padding-inline: clamp(1.25rem, 2.5vw, 2.25rem) !important;
}

.portal-main > .container > .d-flex.justify-content-between.align-items-center.mb-4 {
    align-items: center !important;
    flex-wrap: wrap;
    gap: var(--bt-space-3);
    padding-bottom: var(--bt-space-4);
    margin-bottom: var(--bt-space-5) !important;
    border-bottom: 1px solid var(--bt-border);
}

.portal-main > .container > .d-flex.justify-content-between.align-items-center.mb-4 > h1 {
    color: var(--bt-text-primary);
    font-size: clamp(1.35rem, 2vw, 1.75rem);
    letter-spacing: -0.02em;
}

.portal-main .row {
    --bs-gutter-y: var(--bt-section-gap);
}

.portal-main .card {
    background-color: var(--bt-surface);
    border-color: var(--bt-border-light);
}

.portal-main .card-body {
    padding: var(--bt-space-5);
}

.portal-main .card-header,
.portal-main .card-footer {
    padding: var(--bt-space-3) var(--bt-space-5);
}

.portal-main .card-header {
    color: var(--bt-text-primary);
    font-weight: var(--bt-font-weight-semibold);
}

.form-label {
    margin-bottom: var(--bt-space-2);
    color: var(--bt-text-secondary);
    font-weight: var(--bt-font-weight-semibold);
}

.form-control:not(.form-control-sm),
.form-select:not(.form-select-sm) {
    min-height: var(--bt-control-height);
    border-radius: var(--bt-radius);
    transition: border-color var(--bt-transition-fast), box-shadow var(--bt-transition-fast);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--bt-border-focus);
    box-shadow: 0 0 0 0.2rem rgba(var(--bs-primary-rgb), 0.15);
}

.portal-sidebar-content {
    width: 100%;
    max-height: calc(100vh - var(--bt-header-height));
    overflow-y: auto;
}

.portal-sidebar-content.bg-dark {
    background: var(--bt-primary-600) !important;
}

.portal-sidebar-content.bg-light {
    background: var(--bt-surface) !important;
}

.portal-sidebar-content .nav-link {
    display: flex;
    align-items: center;
    min-height: 2.625rem;
    margin-block: 2px;
    padding: var(--bt-space-2) var(--bt-space-3);
    border-radius: var(--bt-radius);
    transition: color var(--bt-transition-fast), background-color var(--bt-transition-fast);
}

.portal-sidebar-content.bg-dark .nav-link:not(.active) {
    color: var(--bt-white) !important;
}

.portal-sidebar-content.bg-light .nav-link:not(.active) {
    color: var(--bt-text-primary) !important;
}

.portal-sidebar-content .nav-link i {
    width: 1.25rem;
    flex: 0 0 1.25rem;
    text-align: center;
}

.portal-sidebar-content .nav-link.active {
    background: var(--bt-primary) !important;
    color: var(--bt-text-on-primary) !important;
    font-weight: var(--bt-font-weight-semibold);
}

.portal-sidebar-content.bg-dark .nav-link:not(.active):hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--bt-white);
}

.portal-sidebar-content.bg-light .nav-link:not(.active):hover {
    background: var(--bt-primary-50);
    color: var(--bt-primary);
}

.table:not(.table-sm) > :not(caption) > * > * {
    padding: var(--bt-space-3);
    vertical-align: middle;
}

.table thead th {
    color: var(--bt-text-secondary);
    font-size: var(--bt-font-size-sm);
    font-weight: var(--bt-font-weight-semibold);
    white-space: nowrap;
}

.table-responsive {
    border-radius: var(--bt-radius);
}

@media (max-width: 575.98px) {
    .portal-main {
        padding-top: var(--bt-space-4);
    }

    .portal-main .card-body {
        padding: var(--bt-space-4);
    }

    .portal-main .card-header,
    .portal-main .card-footer {
        padding: var(--bt-space-3) var(--bt-space-4);
    }
}

.landing-main-page > :not(.container) {
    box-sizing: border-box;
    width: 100%;
    max-width: var(--bt-container-max);
    margin-inline: auto;
    padding-inline: clamp(1rem, 2.5vw, 2.25rem);
}

.landing-main-page > .page-header:first-child {
    margin-top: clamp(1.25rem, 2.5vw, 2rem);
}

.landing-main-page > .py-4 {
    padding-block: clamp(1.25rem, 2.5vw, 2rem) !important;
}

.landing-main-page > .container {
    max-width: var(--bt-container-max);
}

.landing-main-page > .card + .card {
    margin-top: var(--bt-section-gap);
}

/* Standard pagination button sizing */
.dataTables_paginate .paginate_button, .dt-paging .dt-paging-button, .pagination .page-link { padding: .25rem .5rem !important; font-size: .875rem !important; line-height: 1.25 !important; }