/**
 * Modern CSS Architecture with Custom Properties
 * 
 * Features:
 * - CSS Custom Properties (variables) for theming
 * - Modern layout with Flexbox and Grid
 * - Responsive design with mobile-first approach
 * - Accessibility improvements
 * - Performance optimizations
 * - Dark mode support
 */

/* ========================================
   CSS Custom Properties (Design Tokens)
   ======================================== */

:root {
    /* Colors - Primary */
    --color-primary: #5c61f2;
    --color-primary-light: #7b7ff4;
    --color-primary-dark: #4347d1;
    --color-primary-rgb: 92, 97, 242;

    /* Colors - Semantic */
    --color-success: #28a745;
    --color-warning: #ffc107;
    --color-danger: #dc3545;
    --color-info: #17a2b8;

    /* Colors - Neutral */
    --color-white: #ffffff;
    --color-black: #000000;
    --color-gray-100: #f8f9fa;
    --color-gray-200: #e9ecef;
    --color-gray-300: #dee2e6;
    --color-gray-400: #ced4da;
    --color-gray-500: #adb5bd;
    --color-gray-600: #6c757d;
    --color-gray-700: #495057;
    --color-gray-800: #343a40;
    --color-gray-900: #212529;

    /* Typography */
    --font-family-base: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-mono: 'SFMono-Regular', Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
    
    --font-size-base: 1rem;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 2.5rem;

    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-base: 1.5;
    --line-height-tight: 1.25;
    --line-height-relaxed: 1.75;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 1rem;
    --border-radius-xl: 1.5rem;
    --border-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-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Z-Index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;

    /* Layout */
    --container-max-width: 1320px;
    --sidebar-width: 285px;
    --navbar-height: 80px;

    /* Breakpoints (for JavaScript) */
    --breakpoint-sm: 576px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 992px;
    --breakpoint-xl: 1200px;
    --breakpoint-2xl: 1400px;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --color-primary: #7b7ff4;
    --color-gray-100: #212529;
    --color-gray-200: #343a40;
    --color-gray-300: #495057;
    --color-gray-800: #e9ecef;
    --color-gray-900: #f8f9fa;
}

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

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-base);
    color: var(--color-gray-900);
    background-color: var(--color-gray-100);
    min-height: 100vh;
}

/* ========================================
   Accessibility Improvements
   ======================================== */

/* Skip to main content link */
.skip-to-content {
    position: absolute;
    left: -9999px;
    top: 0;
    z-index: var(--z-tooltip);
    padding: var(--spacing-md);
    background-color: var(--color-primary);
    color: var(--color-white);
    text-decoration: none;
    border-radius: var(--border-radius-md);
}

.skip-to-content:focus {
    left: var(--spacing-md);
}

/* Focus visible - modern focus indicators */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Remove outline for mouse users */
:focus:not(:focus-visible) {
    outline: none;
}

/* Improved focus for interactive elements */
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(var(--color-primary-rgb), 0.1);
}

/* Screen reader only content */
.sr-only,
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ========================================
   Modern Button Resets
   ======================================== */

button {
    background: none;
    border: none;
    padding: 0;
    font: inherit;
    color: inherit;
    cursor: pointer;
}

button.toggle-sidebar,
button[type="button"].toggle-sidebar {
    /* Styles from custom-fixes.css - consolidated here */
    position: absolute;
    right: 30px;
    top: 30px;
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius-lg);
    background-color: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

button.toggle-sidebar:hover {
    background-color: rgba(var(--color-primary-rgb), 0.1);
    transform: scale(1.05);
}

button.toggle-sidebar:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ========================================
   Modern Layout System
   ======================================== */

.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
}

/* Modern Grid System */
.grid {
    display: grid;
    gap: var(--spacing-md);
}

.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
.grid-cols-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

/* Flexbox Utilities */
.flex {
    display: flex;
}

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

.items-center {
    align-items: center;
}

.items-start {
    align-items: flex-start;
}

.items-end {
    align-items: flex-end;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.justify-around {
    justify-content: space-around;
}

.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

/* ========================================
   Modern Card Component
   ======================================== */

.card-modern {
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: box-shadow var(--transition-base);
}

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

.card-modern-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-gray-200);
}

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

.card-modern-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--color-gray-200);
    background-color: var(--color-gray-100);
}

/* ========================================
   Toast Notifications
   ======================================== */

.toast-notification {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    min-width: 300px;
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--color-white);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-xl);
    transform: translateY(100px);
    opacity: 0;
    transition: all var(--transition-base);
    z-index: var(--z-tooltip);
}

.toast-notification.show {
    transform: translateY(0);
    opacity: 1;
}

.toast-success {
    border-left: 4px solid var(--color-success);
}

.toast-error {
    border-left: 4px solid var(--color-danger);
}

.toast-warning {
    border-left: 4px solid var(--color-warning);
}

.toast-info {
    border-left: 4px solid var(--color-info);
}

/* ========================================
   Loading Spinner
   ======================================== */

.loading-spinner {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
}

.spinner-border {
    display: inline-block;
    width: 2rem;
    height: 2rem;
    vertical-align: text-bottom;
    border: 0.25em solid currentColor;
    border-right-color: transparent;
    border-radius: var(--border-radius-full);
    animation: spinner-border 0.75s linear infinite;
}

.spinner-border-sm {
    width: 1rem;
    height: 1rem;
    border-width: 0.2em;
}

@keyframes spinner-border {
    to {
        transform: rotate(360deg);
    }
}

/* ========================================
   Form Enhancements
   ======================================== */

.form-control {
    display: block;
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-base);
    color: var(--color-gray-900);
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--border-radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 0.2rem rgba(var(--color-primary-rgb), 0.25);
}

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

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

.invalid-feedback {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--color-danger);
}

.valid-feedback {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--color-success);
}

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

@media (max-width: 767px) {
    :root {
        --navbar-height: 60px;
        --sidebar-width: 250px;
    }

    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4,
    .grid-cols-6 {
        grid-template-columns: repeat(1, minmax(0, 1fr));
    }

    .toast-notification {
        left: var(--spacing-md);
        right: var(--spacing-md);
        min-width: auto;
    }
}

@media (min-width: 768px) {
    .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .md\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 992px) {
    .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .lg\:grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

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

@media print {
    .no-print,
    .sidebar-wrapper,
    .page-header,
    button.toggle-sidebar {
        display: none !important;
    }

    body {
        background-color: white;
    }

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

/* ========================================
   Reduced Motion Support
   ======================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}


/* ========================================
   Modern Dashboard Components
   ======================================== */

.dashboard-modern {
    background-color: var(--color-gray-100);
    padding-top: var(--spacing-lg);
}

.dashboard-card {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    border: none;
    overflow: hidden;
}

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

.card-header-modern {
    background: rgba(var(--color-primary-rgb), 0.1);
    border-bottom: 1px solid rgba(var(--color-primary-rgb), 0.2);
    padding: var(--spacing-lg);
    color: var(--color-primary);
}

.card-header-modern h5 {
    color: var(--color-primary) !important;
    margin: 0;
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-lg);
}

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

.card-footer-modern {
    background: var(--color-gray-100);
    border-top: 1px solid var(--color-gray-200);
    padding: var(--spacing-lg);
    text-align: right;
}

.form-label-modern {
    font-weight: var(--font-weight-semibold);
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
}

.form-select-modern,
.form-control-modern {
    border: 2px solid var(--color-gray-200);
    border-radius: var(--border-radius-md);
    padding: 0.75rem 1rem;
    font-size: var(--font-size-sm);
    transition: all var(--transition-base);
    background: var(--color-white);
    width: 100%;
}

.form-select-modern:focus,
.form-control-modern:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 0.2rem rgba(var(--color-primary-rgb), 0.25);
    outline: none;
}

.img-thumbnail {
    border-radius: var(--border-radius-md);
    border: 2px solid var(--color-gray-200);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
}

.action-buttons .btn {
    padding: 0.5rem 1rem;
}

/* Base Button Extensions */
.btn-primary {
    background: linear-gradient(135deg, #007bff 0%, #6610f2 100%);
}

.btn-success {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
}

.btn-info {
    background: linear-gradient(135deg, #17a2b8 0%, #20c997 100%);
}

.btn-secondary {
    background: var(--color-gray-600);
}

/* Responsive Design Extensions */
@media (max-width: 768px) {
    .action-buttons {
        flex-direction: column;
    }

    .action-buttons .btn {
        width: 100%;
    }

    .card-footer-modern {
        text-align: center;
    }

    .card-footer-modern .btn {
        margin-bottom: var(--spacing-sm);
        width: 100%;
    }
}