/* ===================================
   Library Discovery System - Main Stylesheet
   =================================== */

/* CSS Variables */
:root {
    /* Color Palette */
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --secondary: #64748b;
    --secondary-dark: #475569;
    --secondary-light: #94a3b8;
    --success: #10b981;
    --success-dark: #059669;
    --success-light: #34d399;
    --danger: #ef4444;
    --danger-dark: #dc2626;
    --danger-light: #f87171;
    --warning: #f59e0b;
    --warning-dark: #d97706;
    --warning-light: #fbbf24;
    --info: #3b82f6;
    --info-dark: #2563eb;
    --info-light: #60a5fa;

    /* Neutral Colors */
    --white: #ffffff;
    --black: #000000;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-family-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;
    --font-size-base: 16px;
    --line-height-base: 1.5;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --transition-base: all 0.2s ease-in-out;
    --transition-fast: all 0.15s ease-in-out;
}

/* ===================================
   Reset & Base Styles
   =================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: var(--line-height-base);
    color: var(--gray-800);
    background-color: var(--gray-50);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===================================
   Typography
   =================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--gray-900);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

strong, b {
    font-weight: 600;
}

code {
    font-family: var(--font-family-mono);
    background-color: var(--gray-100);
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
    font-size: 0.875em;
}

/* ===================================
   Navigation
   =================================== */

.navbar {
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

/* Let LDS header control its own padding / flex wrapping */
.navbar.navbar-lds {
    padding-top: 0.35rem;
    padding-bottom: 0.35rem;
}

/* Light navbar default (only when not using Bootstrap dark/primary nav) */
.navbar:not(.navbar-dark):not(.bg-primary):not(.bg-dark) {
    background-color: var(--white);
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
}

.navbar:not(.navbar-dark) .navbar-brand {
    color: var(--primary);
}

.navbar:not(.navbar-dark) .navbar-brand:hover {
    color: var(--primary-dark);
    text-decoration: none;
}

.nav-link {
    padding: var(--spacing-sm) var(--spacing-md);
    transition: var(--transition-fast);
    display: inline-block;
}

/* Light navbar link colours */
.navbar:not(.navbar-dark) .nav-link {
    color: var(--gray-700);
}

.navbar:not(.navbar-dark) .nav-link:hover {
    color: var(--primary);
    text-decoration: none;
}

.navbar:not(.navbar-dark) .nav-link.active {
    color: var(--primary);
    font-weight: 600;
}

/* Dark / primary navbar — keep high-contrast white menus */
.navbar.navbar-dark,
.navbar.bg-primary {
    background-color: #0d6efd !important;
}

.navbar.navbar-dark .navbar-brand,
.navbar.bg-primary .navbar-brand,
.navbar.navbar-dark .navbar-brand:hover,
.navbar.bg-primary .navbar-brand:hover {
    color: #ffffff !important;
    text-decoration: none;
}

.navbar.navbar-dark .nav-link,
.navbar.bg-primary .nav-link,
.navbar.navbar-dark .navbar-nav .nav-link,
.navbar.bg-primary .navbar-nav .nav-link {
    color: #ffffff !important;
    opacity: 0.95;
}

.navbar.navbar-dark .nav-link:hover,
.navbar.navbar-dark .nav-link:focus,
.navbar.bg-primary .nav-link:hover,
.navbar.bg-primary .nav-link:focus,
.navbar.navbar-dark .nav-link.active,
.navbar.bg-primary .nav-link.active {
    color: #ffffff !important;
    opacity: 1;
    font-weight: 600;
}

.navbar.navbar-dark .navbar-toggler,
.navbar.bg-primary .navbar-toggler {
    border-color: rgba(255, 255, 255, 0.85);
}

.navbar.navbar-dark .navbar-toggler-icon,
.navbar.bg-primary .navbar-toggler-icon {
    filter: brightness(0) invert(1);
}

/* When mobile menu opens, keep readable contrast */
.navbar.navbar-dark .navbar-collapse,
.navbar.bg-primary .navbar-collapse {
    background-color: #0d6efd;
}

@media (max-width: 767.98px) {
    .navbar.navbar-dark .navbar-collapse,
    .navbar.bg-primary .navbar-collapse {
        padding: 0.75rem 0.5rem 1rem;
        border-radius: 0 0 0.5rem 0.5rem;
    }
}

/* ===================================
   Container & Layout
   =================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--spacing-md);
}

main {
    flex: 1;
    padding: var(--spacing-2xl) 0;
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 calc(var(--spacing-md) * -0.5);
}

.col {
    flex: 1;
    padding: 0 calc(var(--spacing-md) * 0.5);
}

/* Grid System */
.col-1 { flex: 0 0 8.333%; max-width: 8.333%; }
.col-2 { flex: 0 0 16.666%; max-width: 16.666%; }
.col-3 { flex: 0 0 25%; max-width: 25%; }
.col-4 { flex: 0 0 33.333%; max-width: 33.333%; }
.col-5 { flex: 0 0 41.666%; max-width: 41.666%; }
.col-6 { flex: 0 0 50%; max-width: 50%; }
.col-7 { flex: 0 0 58.333%; max-width: 58.333%; }
.col-8 { flex: 0 0 66.666%; max-width: 66.666%; }
.col-9 { flex: 0 0 75%; max-width: 75%; }
.col-10 { flex: 0 0 83.333%; max-width: 83.333%; }
.col-11 { flex: 0 0 91.666%; max-width: 91.666%; }
.col-12 { flex: 0 0 100%; max-width: 100%; }

/* ===================================
   Forms
   =================================== */

.form-group {
    margin-bottom: var(--spacing-lg);
}

label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--gray-700);
}

.form-control {
    width: 100%;
    padding: 0.625rem var(--spacing-md);
    font-size: 1rem;
    line-height: 1.5;
    color: var(--gray-900);
    background-color: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-control:disabled {
    background-color: var(--gray-100);
    cursor: not-allowed;
    opacity: 0.6;
}

.form-control.is-invalid {
    border-color: var(--danger);
}

.form-control.is-invalid:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-control.is-valid {
    border-color: var(--success);
}

.form-control.is-valid:focus {
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

textarea.form-control {
    min-height: 100px;
    resize: vertical;
}

select.form-control {
    cursor: pointer;
}

.form-check {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.form-check-input {
    width: 1.25rem;
    height: 1.25rem;
    margin-right: var(--spacing-sm);
    cursor: pointer;
}

.form-check-label {
    margin-bottom: 0;
    cursor: pointer;
}

.invalid-feedback {
    display: none;
    color: var(--danger);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
}

.form-control.is-invalid ~ .invalid-feedback {
    display: block;
}

.valid-feedback {
    display: none;
    color: var(--success);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
}

.form-control.is-valid ~ .valid-feedback {
    display: block;
}

.form-text {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--gray-600);
}

/* ===================================
   Buttons
   =================================== */

.btn {
    display: inline-block;
    padding: 0.625rem 1.25rem;
    font-size: 1rem;
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
    user-select: none;
}

.btn:hover {
    text-decoration: none;
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Button Variants */
.btn-primary {
    color: var(--white);
    background-color: var(--primary);
    border-color: var(--primary);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
}

.btn-secondary {
    color: var(--white);
    background-color: var(--secondary);
    border-color: var(--secondary);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--secondary-dark);
    border-color: var(--secondary-dark);
}

.btn-success {
    color: var(--white);
    background-color: var(--success);
    border-color: var(--success);
}

.btn-success:hover:not(:disabled) {
    background-color: var(--success-dark);
    border-color: var(--success-dark);
}

.btn-danger {
    color: var(--white);
    background-color: var(--danger);
    border-color: var(--danger);
}

.btn-danger:hover:not(:disabled) {
    background-color: var(--danger-dark);
    border-color: var(--danger-dark);
}

.btn-warning {
    color: var(--white);
    background-color: var(--warning);
    border-color: var(--warning);
}

.btn-warning:hover:not(:disabled) {
    background-color: var(--warning-dark);
    border-color: var(--warning-dark);
}

.btn-info {
    color: var(--white);
    background-color: var(--info);
    border-color: var(--info);
}

.btn-info:hover:not(:disabled) {
    background-color: var(--info-dark);
    border-color: var(--info-dark);
}

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

.btn-outline-primary:hover:not(:disabled) {
    color: var(--white);
    background-color: var(--primary);
}

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

.btn-outline-secondary:hover:not(:disabled) {
    color: var(--white);
    background-color: var(--secondary);
}

.btn-link {
    color: var(--primary);
    background-color: transparent;
    border-color: transparent;
    text-decoration: underline;
}

.btn-link:hover:not(:disabled) {
    color: var(--primary-dark);
}

/* Button Sizes */
.btn-sm {
    padding: 0.375rem 0.875rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 0.875rem 1.75rem;
    font-size: 1.125rem;
}

.btn-block {
    display: block;
    width: 100%;
}

/* ===================================
   Cards & Panels
   =================================== */

.card {
    background-color: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
}

.card-header {
    padding: var(--spacing-lg);
    background-color: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
    font-weight: 600;
    color: var(--gray-900);
}

.card-body {
    padding: var(--spacing-lg);
}

.card-footer {
    padding: var(--spacing-lg);
    background-color: var(--gray-50);
    border-top: 1px solid var(--gray-200);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.card-text {
    margin-bottom: var(--spacing-md);
}

.card-text:last-child {
    margin-bottom: 0;
}

/* ===================================
   Tables
   =================================== */

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

table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--spacing-lg);
}

.table {
    background-color: var(--white);
}

.table thead th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    color: var(--gray-700);
    border-bottom: 2px solid var(--gray-300);
    background-color: var(--gray-50);
}

.table tbody td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--gray-200);
}

.table tbody tr:hover {
    background-color: var(--gray-50);
}

.table tbody tr:last-child td {
    border-bottom: none;
}

.table-striped tbody tr:nth-child(odd) {
    background-color: var(--gray-50);
}

.table-bordered {
    border: 1px solid var(--gray-200);
}

.table-bordered th,
.table-bordered td {
    border: 1px solid var(--gray-200);
}

.table-sm th,
.table-sm td {
    padding: var(--spacing-sm);
}

/* ===================================
   Alerts & Notifications
   =================================== */

.alert {
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    position: relative;
}

.alert-success {
    color: var(--success-dark);
    background-color: #d1fae5;
    border-color: var(--success-light);
}

.alert-danger {
    color: var(--danger-dark);
    background-color: #fee2e2;
    border-color: var(--danger-light);
}

.alert-warning {
    color: var(--warning-dark);
    background-color: #fef3c7;
    border-color: var(--warning-light);
}

.alert-info {
    color: var(--info-dark);
    background-color: #dbeafe;
    border-color: var(--info-light);
}

.alert-dismissible {
    padding-right: 3rem;
}

.alert-dismissible .close {
    position: absolute;
    top: 0;
    right: 0;
    padding: var(--spacing-md) var(--spacing-lg);
    color: inherit;
    background: none;
    border: none;
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    opacity: 0.5;
    transition: var(--transition-fast);
}

.alert-dismissible .close:hover {
    opacity: 1;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 9999;
    max-width: 350px;
}

.toast {
    background-color: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-md);
    animation: slideInRight 0.3s ease-out;
}

@keyframes slideInRight {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast-header {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--gray-200);
    font-weight: 600;
}

.toast-body {
    padding: var(--spacing-md);
}

/* ===================================
   Loading Spinners
   =================================== */

.spinner {
    display: inline-block;
    width: 1.5rem;
    height: 1.5rem;
    border: 3px solid var(--gray-300);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.spinner-sm {
    width: 1rem;
    height: 1rem;
    border-width: 2px;
}

.spinner-lg {
    width: 3rem;
    height: 3rem;
    border-width: 4px;
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9998;
}

.loading-overlay .spinner {
    width: 3rem;
    height: 3rem;
    border-width: 4px;
    border-color: var(--white);
    border-top-color: var(--primary);
}

/* ===================================
   Badges & Labels
   =================================== */

.badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: var(--radius-sm);
}

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

.badge-secondary {
    color: var(--white);
    background-color: var(--secondary);
}

.badge-success {
    color: var(--white);
    background-color: var(--success);
}

.badge-danger {
    color: var(--white);
    background-color: var(--danger);
}

.badge-warning {
    color: var(--gray-900);
    background-color: var(--warning);
}

.badge-info {
    color: var(--white);
    background-color: var(--info);
}

/* ===================================
   Footer
   =================================== */

.footer {
    background-color: var(--gray-800);
    color: var(--gray-300);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    margin-top: auto;
}

.footer a {
    color: var(--gray-400);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    border-top: 1px solid var(--gray-700);
    font-size: 0.875rem;
}

/* ===================================
   Utility Classes
   =================================== */

/* Spacing */
.m-0 { margin: 0 !important; }
.m-1 { margin: var(--spacing-xs) !important; }
.m-2 { margin: var(--spacing-sm) !important; }
.m-3 { margin: var(--spacing-md) !important; }
.m-4 { margin: var(--spacing-lg) !important; }
.m-5 { margin: var(--spacing-xl) !important; }

.mt-0 { margin-top: 0 !important; }
.mt-1 { margin-top: var(--spacing-xs) !important; }
.mt-2 { margin-top: var(--spacing-sm) !important; }
.mt-3 { margin-top: var(--spacing-md) !important; }
.mt-4 { margin-top: var(--spacing-lg) !important; }
.mt-5 { margin-top: var(--spacing-xl) !important; }

.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: var(--spacing-xs) !important; }
.mb-2 { margin-bottom: var(--spacing-sm) !important; }
.mb-3 { margin-bottom: var(--spacing-md) !important; }
.mb-4 { margin-bottom: var(--spacing-lg) !important; }
.mb-5 { margin-bottom: var(--spacing-xl) !important; }

.ml-0 { margin-left: 0 !important; }
.ml-1 { margin-left: var(--spacing-xs) !important; }
.ml-2 { margin-left: var(--spacing-sm) !important; }
.ml-3 { margin-left: var(--spacing-md) !important; }
.ml-4 { margin-left: var(--spacing-lg) !important; }
.ml-5 { margin-left: var(--spacing-xl) !important; }

.mr-0 { margin-right: 0 !important; }
.mr-1 { margin-right: var(--spacing-xs) !important; }
.mr-2 { margin-right: var(--spacing-sm) !important; }
.mr-3 { margin-right: var(--spacing-md) !important; }
.mr-4 { margin-right: var(--spacing-lg) !important; }
.mr-5 { margin-right: var(--spacing-xl) !important; }

.p-0 { padding: 0 !important; }
.p-1 { padding: var(--spacing-xs) !important; }
.p-2 { padding: var(--spacing-sm) !important; }
.p-3 { padding: var(--spacing-md) !important; }
.p-4 { padding: var(--spacing-lg) !important; }
.p-5 { padding: var(--spacing-xl) !important; }

.pt-0 { padding-top: 0 !important; }
.pt-1 { padding-top: var(--spacing-xs) !important; }
.pt-2 { padding-top: var(--spacing-sm) !important; }
.pt-3 { padding-top: var(--spacing-md) !important; }
.pt-4 { padding-top: var(--spacing-lg) !important; }
.pt-5 { padding-top: var(--spacing-xl) !important; }

.pb-0 { padding-bottom: 0 !important; }
.pb-1 { padding-bottom: var(--spacing-xs) !important; }
.pb-2 { padding-bottom: var(--spacing-sm) !important; }
.pb-3 { padding-bottom: var(--spacing-md) !important; }
.pb-4 { padding-bottom: var(--spacing-lg) !important; }
.pb-5 { padding-bottom: var(--spacing-xl) !important; }

/* Text Alignment */
.text-left { text-align: left !important; }
.text-center { text-align: center !important; }
.text-right { text-align: right !important; }

/* Text Colors */
.text-primary { color: var(--primary) !important; }
.text-secondary { color: var(--secondary) !important; }
.text-success { color: var(--success) !important; }
.text-danger { color: var(--danger) !important; }
.text-warning { color: var(--warning) !important; }
.text-info { color: var(--info) !important; }
.text-muted { color: var(--gray-500) !important; }
.text-white { color: var(--white) !important; }

/* Font Weight */
.font-weight-light { font-weight: 300 !important; }
.font-weight-normal { font-weight: 400 !important; }
.font-weight-medium { font-weight: 500 !important; }
.font-weight-semibold { font-weight: 600 !important; }
.font-weight-bold { font-weight: 700 !important; }

/* Display */
.d-none { display: none !important; }
.d-block { display: block !important; }
.d-inline { display: inline !important; }
.d-inline-block { display: inline-block !important; }
.d-flex { display: flex !important; }

/* Flexbox */
.flex-row { flex-direction: row !important; }
.flex-column { flex-direction: column !important; }
.justify-content-start { justify-content: flex-start !important; }
.justify-content-center { justify-content: center !important; }
.justify-content-end { justify-content: flex-end !important; }
.justify-content-between { justify-content: space-between !important; }
.align-items-start { align-items: flex-start !important; }
.align-items-center { align-items: center !important; }
.align-items-end { align-items: flex-end !important; }

/* Width & Height */
.w-25 { width: 25% !important; }
.w-50 { width: 50% !important; }
.w-75 { width: 75% !important; }
.w-100 { width: 100% !important; }
.h-100 { height: 100% !important; }

/* Border Radius */
.rounded { border-radius: var(--radius-md) !important; }
.rounded-sm { border-radius: var(--radius-sm) !important; }
.rounded-lg { border-radius: var(--radius-lg) !important; }
.rounded-circle { border-radius: 50% !important; }

/* Shadow */
.shadow-none { box-shadow: none !important; }
.shadow-sm { box-shadow: var(--shadow-sm) !important; }
.shadow { box-shadow: var(--shadow-md) !important; }
.shadow-lg { box-shadow: var(--shadow-lg) !important; }

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 768px) {
    /* Typography */
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    h4 { font-size: 1.25rem; }

    /* Container */
    .container {
        padding: 0 var(--spacing-sm);
    }

    /* Grid */
    [class*="col-"] {
        flex: 0 0 100%;
        max-width: 100%;
    }

    /* Navigation */
    .navbar {
        padding: var(--spacing-sm) 0;
    }

    /* Buttons */
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.875rem;
    }

    /* Cards */
    .card-body {
        padding: var(--spacing-md);
    }

    /* Tables */
    .table thead {
        display: none;
    }

    .table tbody tr {
        display: block;
        margin-bottom: var(--spacing-lg);
        border: 1px solid var(--gray-200);
        border-radius: var(--radius-md);
    }

    .table tbody td {
        display: flex;
        justify-content: space-between;
        padding: var(--spacing-sm) var(--spacing-md);
        border-bottom: 1px solid var(--gray-200);
    }

    .table tbody td:before {
        content: attr(data-label);
        font-weight: 600;
        color: var(--gray-700);
    }

    /* Toast */
    .toast-container {
        left: var(--spacing-md);
        right: var(--spacing-md);
        max-width: none;
    }
}

@media (max-width: 576px) {
    main {
        padding: var(--spacing-lg) 0;
    }

    .btn-block-sm {
        display: block;
        width: 100%;
    }
}

/* ===================================
   Print Styles
   =================================== */

@media print {
    .navbar,
    .footer,
    .btn,
    .alert {
        display: none;
    }

    body {
        background-color: var(--white);
    }

    .card {
        box-shadow: none;
        border: 1px solid var(--gray-300);
    }
}