/*
 * SmartBuild Design System v2.0
 * AODA-compliant design framework for construction project management
 * Based on FINAL_DESIGN_SPEC_002.md
 *
 * Features:
 * - Dual-mode support (dark/light) with smooth transitions
 * - WCAG AA/AAA compliant color contrasts
 * - Montserrat typography system
 * - Comprehensive component library
 * - 8px spacing system
 */

/* ============================================================================
   CSS VARIABLES - DARK/LIGHT MODE COLORS
   ============================================================================ */

:root {
    /* Default to light mode */
    --mode: 'light';

    /* Light Mode Colors */
    --sb-bg-primary: #FFFFFF;
    --sb-bg-secondary: #F5F7FA;
    --sb-accent-primary: #00B2E3;
    --sb-accent-secondary: #76A3B2;
    --sb-text-primary: #0F1419;
    --sb-text-secondary: #76777A;
    --sb-border-color: #E1E4E8;
    --sb-btn-primary: #00B2E3;
    --sb-btn-secondary: #006998;
    --sb-error: #FF5F5F;
    --sb-warning: #FFA726;
    --sb-success: #2BB8A6;

    /* Shadow values for light mode */
    --sb-shadow-sm: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.1);
    --sb-shadow-md: 0 4px 6px rgba(0,0,0,0.1), 0 2px 4px rgba(0,0,0,0.1);
    --sb-shadow-lg: 0 8px 24px rgba(0,0,0,0.15);

    /* Transition timing */
    --sb-transition-fast: 200ms ease;
    --sb-transition-normal: 300ms ease;
}

/* Dark Mode Colors */
[data-theme="dark"] {
    --mode: 'dark';

    --sb-bg-primary: #0F1419;
    --sb-bg-secondary: #1F2C35;
    --sb-accent-primary: #00B2E3;
    --sb-accent-secondary: #76A3B2;
    --sb-text-primary: #FFFFFF;
    --sb-text-secondary: #76777A;
    --sb-border-color: #2E3A44;
    --sb-btn-primary: #00B2E3;
    --sb-btn-secondary: #006998;
    --sb-error: #FF5F5F;
    --sb-warning: #FFA726;
    --sb-success: #2BB8A6;

    /* Shadow values for dark mode */
    --sb-shadow-sm: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.3);
    --sb-shadow-md: 0 4px 6px rgba(0,0,0,0.3), 0 2px 4px rgba(0,0,0,0.3);
    --sb-shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
}

/* Smooth transitions for theme switching */
* {
    transition: background-color var(--sb-transition-normal),
                color var(--sb-transition-normal),
                border-color var(--sb-transition-normal),
                box-shadow var(--sb-transition-normal);
}

/* Disable transitions on elements that shouldn't animate */
*:focus,
*:active,
.no-transition {
    transition: none;
}

/* ============================================================================
   BASE STYLES
   ============================================================================ */

body {
    background-color: var(--sb-bg-primary);
    color: var(--sb-text-primary);
    font-family: 'Montserrat', sans-serif;
    font-size: 16px;
    line-height: 1.5;
    font-weight: 400;
    margin: 0;
    padding: 0;
}

/* ============================================================================
   TYPOGRAPHY SCALE
   ============================================================================ */

h1, .h1 {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    color: var(--sb-text-primary);
    margin-bottom: 1rem;
}

h2, .h2 {
    font-size: 36px;
    font-weight: 600;
    line-height: 1.3;
    color: var(--sb-text-primary);
    margin-bottom: 0.875rem;
}

h3, .h3 {
    font-size: 28px;
    font-weight: 600;
    line-height: 1.4;
    color: var(--sb-text-primary);
    margin-bottom: 0.75rem;
}

h4, .h4 {
    font-size: 24px;
    font-weight: 600;
    line-height: 1.4;
    color: var(--sb-text-primary);
    margin-bottom: 0.75rem;
}

h5, .h5 {
    font-size: 20px;
    font-weight: 600;
    line-height: 1.5;
    color: var(--sb-text-primary);
    margin-bottom: 0.5rem;
}

h6, .h6 {
    font-size: 18px;
    font-weight: 600;
    line-height: 1.5;
    color: var(--sb-text-primary);
    margin-bottom: 0.5rem;
}

p {
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    color: var(--sb-text-primary);
    margin-bottom: 1rem;
}

.text-large {
    font-size: 18px;
    font-weight: 400;
    line-height: 1.6;
}

.text-small {
    font-size: 14px;
    font-weight: 400;
    line-height: 1.5;
}

.text-caption {
    font-size: 12px;
    font-weight: 400;
    line-height: 1.4;
    color: var(--sb-text-secondary);
}

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

.btn {
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    border-radius: 8px;
    padding: 12px 24px;
    transition: all var(--sb-transition-fast);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    text-decoration: none;
}

/* Primary Button - High specificity to override Bootstrap */
.btn-primary,
.sb-btn-primary,
.btn.btn-primary,
.btn.sb-btn-primary {
    background-color: var(--sb-btn-primary) !important;
    color: #FFFFFF !important;
    border-color: var(--sb-btn-primary) !important;
    box-shadow: 0 4px 12px rgba(0, 178, 227, 0.3);
}

.btn-primary:hover,
.sb-btn-primary:hover,
.btn.btn-primary:hover,
.btn.sb-btn-primary:hover,
.btn-primary:focus,
.sb-btn-primary:focus,
.btn.btn-primary:focus,
.btn.sb-btn-primary:focus,
.btn-primary:active,
.sb-btn-primary:active,
.btn.btn-primary:active,
.btn.sb-btn-primary:active {
    background-color: var(--sb-btn-secondary) !important;
    color: #FFFFFF !important;
    border-color: var(--sb-btn-secondary) !important;
    opacity: 0.9;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 103, 160, 0.4);
}

/* Secondary Button - Filled */
.btn-secondary,
.btn.btn-secondary {
    background-color: var(--sb-btn-secondary) !important;
    border-color: var(--sb-btn-secondary) !important;
    color: #FFFFFF !important;
}

.btn-secondary:hover,
.btn.btn-secondary:hover,
.btn-secondary:focus,
.btn.btn-secondary:focus {
    background-color: var(--sb-btn-primary) !important;
    border-color: var(--sb-btn-primary) !important;
    color: #FFFFFF !important;
    opacity: 0.9;
}

/* Outlined Buttons */
.btn-outline-primary,
.sb-btn-outline,
.btn.btn-outline-primary,
.btn.sb-btn-outline {
    background-color: transparent !important;
    border: 2px solid var(--sb-btn-primary) !important;
    color: var(--sb-btn-primary) !important;
}

.btn-outline-primary:hover,
.sb-btn-outline:hover,
.btn.btn-outline-primary:hover,
.btn.sb-btn-outline:hover,
.btn-outline-primary:focus,
.sb-btn-outline:focus,
.btn.btn-outline-primary:focus,
.btn.sb-btn-outline:focus {
    background-color: var(--sb-btn-primary) !important;
    border-color: var(--sb-btn-primary) !important;
    color: #FFFFFF !important;
    transform: translateY(-2px);
}

.btn-outline-secondary,
.btn.btn-outline-secondary {
    background-color: transparent !important;
    border: 2px solid var(--sb-text-secondary) !important;
    color: var(--sb-text-secondary) !important;
}

.btn-outline-secondary:hover,
.btn.btn-outline-secondary:hover,
.btn-outline-secondary:focus,
.btn.btn-outline-secondary:focus {
    background-color: var(--sb-text-secondary) !important;
    border-color: var(--sb-text-secondary) !important;
    color: #FFFFFF !important;
}

/* Error/Danger Button */
.btn-danger,
.btn-error,
.btn.btn-danger,
.btn.btn-error {
    background-color: var(--sb-error) !important;
    border-color: var(--sb-error) !important;
    color: #FFFFFF !important;
}

.btn-danger:hover,
.btn-error:hover,
.btn.btn-danger:hover,
.btn.btn-error:hover,
.btn-danger:focus,
.btn-error:focus,
.btn.btn-danger:focus,
.btn.btn-error:focus {
    background-color: var(--sb-error) !important;
    border-color: var(--sb-error) !important;
    color: #FFFFFF !important;
    opacity: 0.85;
}

.btn-outline-danger,
.btn.btn-outline-danger {
    background-color: transparent !important;
    border: 2px solid var(--sb-error) !important;
    color: var(--sb-error) !important;
}

.btn-outline-danger:hover,
.btn.btn-outline-danger:hover,
.btn-outline-danger:focus,
.btn.btn-outline-danger:focus {
    background-color: var(--sb-error) !important;
    border-color: var(--sb-error) !important;
    color: #FFFFFF !important;
}

/* Success Button */
.btn-success,
.btn.btn-success {
    background-color: var(--sb-success) !important;
    border-color: var(--sb-success) !important;
    color: #FFFFFF !important;
}

.btn-success:hover,
.btn.btn-success:hover,
.btn-success:focus,
.btn.btn-success:focus {
    background-color: var(--sb-success) !important;
    border-color: var(--sb-success) !important;
    color: #FFFFFF !important;
    opacity: 0.85;
}

.btn-outline-success,
.btn.btn-outline-success {
    background-color: transparent !important;
    border: 2px solid var(--sb-success) !important;
    color: var(--sb-success) !important;
}

.btn-outline-success:hover,
.btn.btn-outline-success:hover,
.btn-outline-success:focus,
.btn.btn-outline-success:focus {
    background-color: var(--sb-success) !important;
    border-color: var(--sb-success) !important;
    color: #FFFFFF !important;
}

/* Button Sizes */
.btn-sm {
    font-size: 14px;
    padding: 8px 16px;
}

.btn-lg {
    font-size: 18px;
    padding: 16px 32px;
}

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

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

.card {
    background-color: var(--sb-bg-secondary);
    border: 1px solid var(--sb-border-color);
    border-radius: 6px;
    padding: 24px;
    box-shadow: var(--sb-shadow-sm);
    transition: all var(--sb-transition-fast);
}

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

.card-header {
    background-color: var(--sb-bg-secondary);
    border-bottom: 1px solid var(--sb-border-color);
    padding: 16px 24px;
    border-radius: 6px 6px 0 0;
    margin: -24px -24px 24px -24px;
}

.card-body {
    color: var(--sb-text-primary);
}

.card-title {
    font-size: 24px;
    font-weight: 600;
    color: var(--sb-text-primary);
    margin-bottom: 0.5rem;
}

/* White Cards (always white background regardless of mode) */
.card-white {
    background-color: #FFFFFF;
    color: #0F1419;
}

.card-white .card-title,
.card-white h1, .card-white h2, .card-white h3,
.card-white h4, .card-white h5, .card-white h6 {
    color: #0F1419;
}

.card-white .text-muted {
    color: #76777A !important;
}

/* Gradient Cards - Tom's Design Spec */

/* Performance Card (Blue Gradient) - Stats, Metrics, Analytics */
.card-gradient-primary,
.gradient-card-performance {
    background: linear-gradient(to top, rgba(0, 178, 227, 0.12) 0%, rgba(255, 255, 255, 1) 100%);
    border: 1px solid var(--sb-border-color);
    border-radius: 6px;
    padding: 24px;
    box-shadow: var(--sb-shadow-sm);
    transition: all var(--sb-transition-fast);
}

[data-theme="dark"] .card-gradient-primary,
[data-theme="dark"] .gradient-card-performance {
    background: linear-gradient(to top, rgba(0, 178, 227, 0.15) 0%, rgba(255, 255, 255, 0.05) 100%);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* Completed Card (Green/Teal Gradient) - Success States, Achievements */
.card-gradient-success,
.gradient-card-completed {
    background: linear-gradient(to top, rgba(43, 184, 166, 0.12) 0%, rgba(255, 255, 255, 1) 100%);
    border: 1px solid var(--sb-border-color);
    border-radius: 6px;
    padding: 24px;
    box-shadow: var(--sb-shadow-sm);
    transition: all var(--sb-transition-fast);
}

[data-theme="dark"] .card-gradient-success,
[data-theme="dark"] .gradient-card-completed {
    background: linear-gradient(to top, rgba(43, 184, 166, 0.15) 0%, rgba(255, 255, 255, 0.05) 100%);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* Resources Card (Blue-grey Gradient) - Information, Documentation */
.card-gradient-secondary,
.gradient-card-resources {
    background: linear-gradient(to top, rgba(118, 163, 178, 0.12) 0%, rgba(255, 255, 255, 1) 100%);
    border: 1px solid var(--sb-border-color);
    border-radius: 6px;
    padding: 24px;
    box-shadow: var(--sb-shadow-sm);
    transition: all var(--sb-transition-fast);
}

[data-theme="dark"] .card-gradient-secondary,
[data-theme="dark"] .gradient-card-resources {
    background: linear-gradient(to top, rgba(118, 163, 178, 0.15) 0%, rgba(255, 255, 255, 0.05) 100%);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* Warning Card (Amber Gradient) - Warnings, Alerts */
.card-gradient-warning,
.gradient-card-warning {
    background: linear-gradient(to top, rgba(255, 167, 38, 0.12) 0%, rgba(255, 255, 255, 1) 100%);
    border: 1px solid var(--sb-border-color);
    border-radius: 6px;
    padding: 24px;
    box-shadow: var(--sb-shadow-sm);
    transition: all var(--sb-transition-fast);
}

[data-theme="dark"] .card-gradient-warning,
[data-theme="dark"] .gradient-card-warning {
    background: linear-gradient(to top, rgba(255, 167, 38, 0.15) 0%, rgba(255, 255, 255, 0.05) 100%);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* Error Card (Red Gradient) - Errors, Critical Alerts */
.card-gradient-error,
.gradient-card-error {
    background: linear-gradient(to top, rgba(255, 95, 95, 0.12) 0%, rgba(255, 255, 255, 1) 100%);
    border: 1px solid var(--sb-border-color);
    border-radius: 6px;
    padding: 24px;
    box-shadow: var(--sb-shadow-sm);
    transition: all var(--sb-transition-fast);
}

[data-theme="dark"] .card-gradient-error,
[data-theme="dark"] .gradient-card-error {
    background: linear-gradient(to top, rgba(255, 95, 95, 0.15) 0%, rgba(255, 255, 255, 0.05) 100%);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* Hover states for all gradient cards */
.card-gradient-primary:hover,
.card-gradient-success:hover,
.card-gradient-secondary:hover,
.card-gradient-warning:hover,
.card-gradient-error:hover,
.gradient-card-performance:hover,
.gradient-card-completed:hover,
.gradient-card-resources:hover,
.gradient-card-warning:hover,
.gradient-card-error:hover {
    transform: translateY(-4px);
    box-shadow: var(--sb-shadow-lg);
    cursor: pointer;
}

[data-theme="dark"] .card-gradient-primary:hover,
[data-theme="dark"] .card-gradient-success:hover,
[data-theme="dark"] .card-gradient-secondary:hover,
[data-theme="dark"] .card-gradient-warning:hover,
[data-theme="dark"] .card-gradient-error:hover,
[data-theme="dark"] .gradient-card-performance:hover,
[data-theme="dark"] .gradient-card-completed:hover,
[data-theme="dark"] .gradient-card-resources:hover,
[data-theme="dark"] .gradient-card-warning:hover,
[data-theme="dark"] .gradient-card-error:hover {
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.4), 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* Mobile: Reduce padding on gradient cards */
@media (max-width: 1024px) {
    .card-gradient-primary,
    .card-gradient-success,
    .card-gradient-secondary,
    .card-gradient-warning,
    .card-gradient-error,
    .gradient-card-performance,
    .gradient-card-completed,
    .gradient-card-resources,
    .gradient-card-warning,
    .gradient-card-error {
        padding: 16px;
    }
}

/* ============================================================================
   FORM ELEMENTS
   ============================================================================ */

.form-control {
    background-color: var(--sb-bg-primary);
    border: 1px solid var(--sb-border-color);
    border-radius: 8px;
    padding: 12px 16px;
    font-size: 16px;
    font-family: 'Montserrat', sans-serif;
    color: var(--sb-text-primary);
    transition: all var(--sb-transition-fast);
}

.form-control:focus {
    border-color: var(--sb-accent-primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 178, 227, 0.1);
}

.form-control::placeholder {
    color: var(--sb-text-secondary);
    opacity: 0.6;
}

label {
    font-size: 14px;
    font-weight: 500;
    color: var(--sb-text-primary);
    margin-bottom: 8px;
    display: block;
}

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

select.form-control {
    cursor: pointer;
}

/* Input Groups */
.input-group {
    display: flex;
    align-items: stretch;
}

.input-group-prepend,
.input-group-append {
    display: flex;
    align-items: center;
}

.input-group-text {
    background-color: var(--sb-bg-secondary);
    border: 1px solid var(--sb-border-color);
    padding: 12px 16px;
    color: var(--sb-text-secondary);
    border-radius: 8px 0 0 8px;
}

.input-group .form-control {
    border-radius: 0 8px 8px 0;
}

/* Checkboxes & Radio Buttons */
.custom-control-input:checked ~ .custom-control-label::before {
    background-color: var(--sb-accent-primary);
    border-color: var(--sb-accent-primary);
}

/* Toggle Switches */
.custom-switch .custom-control-label::before {
    width: 44px;
    height: 24px;
    border-radius: 12px;
    background-color: var(--sb-border-color);
}

.custom-switch .custom-control-input:checked ~ .custom-control-label::before {
    background-color: var(--sb-accent-primary);
}

/* Progress Bars */
.progress {
    height: 8px;
    border-radius: 4px;
    background-color: var(--sb-border-color);
    overflow: hidden;
}

.progress-bar {
    background-color: var(--sb-accent-primary);
    transition: width 0.3s ease;
}

/* ============================================================================
   BADGES
   ============================================================================ */

.badge {
    font-family: 'Montserrat', sans-serif;
    font-size: 12px;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.badge-primary {
    background-color: var(--sb-accent-primary);
    color: #FFFFFF;
}

.badge-secondary {
    background-color: var(--sb-bg-secondary);
    color: var(--sb-text-secondary);
    border: 1px solid var(--sb-border-color);
}

.badge-success {
    background-color: var(--sb-success);
    color: #FFFFFF;
}

.badge-warning {
    background-color: var(--sb-warning);
    color: #FFFFFF;
}

.badge-danger,
.badge-error {
    background-color: var(--sb-error);
    color: #FFFFFF;
}

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

.alert {
    border-radius: 6px;
    padding: 16px;
    margin-bottom: 1rem;
    border: 1px solid;
    display: flex;
    align-items: start;
    gap: 12px;
}

.alert-info,
.alert.alert-info {
    background-color: rgba(0, 178, 227, 0.1) !important;
    border-color: var(--sb-accent-primary) !important;
    color: var(--sb-text-primary) !important;
}

[data-theme="dark"] .alert-info,
[data-theme="dark"] .alert.alert-info {
    background-color: rgba(0, 178, 227, 0.15) !important;
}

.alert-warning,
.alert.alert-warning {
    background-color: rgba(255, 167, 38, 0.1) !important;
    border-color: var(--sb-warning) !important;
    color: var(--sb-text-primary) !important;
}

[data-theme="dark"] .alert-warning,
[data-theme="dark"] .alert.alert-warning {
    background-color: rgba(255, 167, 38, 0.15) !important;
}

.alert-danger,
.alert-error,
.alert.alert-danger,
.alert.alert-error {
    background-color: rgba(255, 95, 95, 0.1) !important;
    border-color: var(--sb-error) !important;
    color: var(--sb-text-primary) !important;
}

[data-theme="dark"] .alert-danger,
[data-theme="dark"] .alert-error,
[data-theme="dark"] .alert.alert-danger,
[data-theme="dark"] .alert.alert-error {
    background-color: rgba(255, 95, 95, 0.15) !important;
}

.alert-success,
.alert.alert-success {
    background-color: rgba(43, 184, 166, 0.1) !important;
    border-color: var(--sb-success) !important;
    color: var(--sb-text-primary) !important;
}

[data-theme="dark"] .alert-success,
[data-theme="dark"] .alert.alert-success {
    background-color: rgba(43, 184, 166, 0.15) !important;
}

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

.modal-content {
    background-color: var(--sb-bg-primary);
    border: 2px solid var(--sb-border-color);
    border-radius: 6px;
    color: var(--sb-text-primary);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2), 0 2px 8px rgba(0, 0, 0, 0.1);
    display: block !important;
    opacity: 1 !important;
    visibility: visible !important;
}

[data-theme="dark"] .modal-content {
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5), 0 2px 8px rgba(0, 0, 0, 0.3);
}

.modal-header {
    border-bottom: 1px solid var(--sb-border-color);
    background-color: var(--sb-bg-primary);
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    color: var(--sb-text-primary);
    font-weight: 600;
    font-size: 20px;
    line-height: 1.5;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 12px;
}

.modal-body {
    padding: 24px;
    color: var(--sb-text-primary);
    background-color: var(--sb-bg-primary);
}

.modal-footer {
    border-top: 1px solid var(--sb-border-color);
    background-color: var(--sb-bg-primary);
    padding: 16px 24px;
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

.modal-footer .btn {
    margin: 0;
}

/* Modal backdrop - darker for better modal visibility */
.modal-backdrop.show {
    opacity: 0.6;
}

[data-theme="dark"] .modal-backdrop.show {
    opacity: 0.75;
}

/* ============================================================================
   DARK/LIGHT MODE TOGGLE BUTTON (In Header)
   ============================================================================ */

/* Theme toggle is now in the header via #theme-toggle-btn - no floating button needed */

/* ============================================================================
   UTILITY CLASSES
   ============================================================================ */

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

.text-secondary {
    color: var(--sb-text-secondary) !important;
}

.text-muted {
    color: var(--sb-text-secondary) !important;
}

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

.text-success {
    color: var(--sb-success) !important;
}

.text-warning {
    color: var(--sb-warning) !important;
}

.text-error,
.text-danger {
    color: var(--sb-error) !important;
}

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

.bg-secondary {
    background-color: var(--sb-bg-secondary) !important;
}

/* Spacing utilities (8px base system) */
.gap-xs { gap: 4px; }
.gap-sm { gap: 8px; }
.gap-md { gap: 16px; }
.gap-lg { gap: 24px; }
.gap-xl { gap: 32px; }

/* Border utilities */
.border {
    border: 1px solid var(--sb-border-color);
}

.border-top {
    border-top: 1px solid var(--sb-border-color);
}

.border-bottom {
    border-bottom: 1px solid var(--sb-border-color);
}

.border-left {
    border-left: 1px solid var(--sb-border-color);
}

.border-right {
    border-right: 1px solid var(--sb-border-color);
}

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

@media (max-width: 768px) {
    h1, .h1 { font-size: 36px; }
    h2, .h2 { font-size: 28px; }
    h3, .h3 { font-size: 24px; }
    h4, .h4 { font-size: 20px; }
    h5, .h5 { font-size: 18px; }
    h6, .h6 { font-size: 16px; }
}

/* ============================================================================
   ACCESSIBILITY
   ============================================================================ */

/* Focus visible for keyboard navigation */
*:focus-visible {
    outline: 2px solid var(--sb-accent-primary);
    outline-offset: 2px;
}

/* Skip to content link */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--sb-accent-primary);
    color: white;
    padding: 8px;
    text-decoration: none;
    z-index: 10000;
}

.skip-to-content:focus {
    top: 0;
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}