/* 
 * NeverBots Academy - Complete Stylesheet
 * Version: 1.0
 * Description: Modern, responsive e-learning platform styles
 */

/* ==================== CSS Variables ==================== */
:root {
    /* Primary Colors */
    --primary-color: #3B82F6;
    --primary-dark: #2563EB;
    --primary-light: #60A5FA;
    --primary-bg: #EFF6FF;
    
    /* Secondary Colors */
    --secondary-color: #10B981;
    --secondary-dark: #059669;
    --secondary-light: #34D399;
    --secondary-bg: #ECFDF5;
    
    /* Status Colors */
    --success-color: #10B981;
    --warning-color: #F59E0B;
    --danger-color: #EF4444;
    --info-color: #3B82F6;
    
    /* Neutral Colors */
    --dark-color: #1F2937;
    --gray-900: #111827;
    --gray-800: #1F2937;
    --gray-700: #374151;
    --gray-600: #4B5563;
    --gray-500: #6B7280;
    --gray-400: #9CA3AF;
    --gray-300: #D1D5DB;
    --gray-200: #E5E7EB;
    --gray-100: #F3F4F6;
    --gray-50: #F9FAFB;
    --white: #FFFFFF;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-mono: 'Fira Code', 'Courier New', monospace;
    
    /* 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 */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --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);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* Dark Mode Variables */
@media (prefers-color-scheme: dark) {
    :root {
        --dark-color: #F9FAFB;
        --gray-900: #F3F4F6;
        --gray-800: #E5E7EB;
        --gray-700: #D1D5DB;
        --gray-600: #9CA3AF;
        --gray-500: #6B7280;
        --gray-400: #4B5563;
        --gray-300: #374151;
        --gray-200: #1F2937;
        --gray-100: #111827;
        --gray-50: #030712;
        --white: #030712;
    }
}

/* ==================== Reset & Base Styles ==================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--gray-900);
    background-color: var(--gray-50);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==================== Typography ==================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--gray-900);
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.75rem;
}

h4 {
    font-size: 1.5rem;
}

h5 {
    font-size: 1.25rem;
}

h6 {
    font-size: 1.125rem;
}

p {
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

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

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

/* ==================== Layout Components ==================== */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

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

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

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

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

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

/* ==================== Navigation ==================== */
.navbar {
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    transition: all var(--transition-base);
}

.navbar-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4rem;
    padding: 0 var(--spacing-lg);
}

.navbar-brand {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.navbar-brand img {
    height: 2.5rem;
    margin-right: var(--spacing-sm);
}

.navbar-menu {
    display: flex;
    align-items: center;
    list-style: none;
    gap: var(--spacing-xl);
}

.navbar-link {
    color: var(--gray-700);
    font-weight: 500;
    padding: var(--spacing-sm) 0;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
}

.navbar-link:hover {
    color: var(--primary-color);
    text-decoration: none;
    border-bottom-color: var(--primary-color);
}

.navbar-link.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-700);
    cursor: pointer;
}

/* ==================== Cards ==================== */
.card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: all var(--transition-base);
}

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

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

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

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

/* Course Cards */
.course-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition-base);
    cursor: pointer;
}

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

.course-card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

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

.course-card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--gray-900);
}

.course-card-description {
    color: var(--gray-600);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.course-card-stats {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    font-size: 0.875rem;
    color: var(--gray-500);
}

.course-card-progress {
    margin-top: var(--spacing-md);
}

/* ==================== Buttons ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 500;
    line-height: 1.5;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
    user-select: none;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: translateY(0);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
}

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

.btn-secondary:hover {
    background: var(--gray-700);
    border-color: var(--gray-700);
}

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

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

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

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

.btn-outline:hover {
    background: var(--primary-color);
    color: var(--white);
}

/* Button Sizes */
.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.875rem;
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.125rem;
}

.btn-block {
    width: 100%;
}

/* ==================== Forms ==================== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--gray-700);
    font-size: 0.875rem;
}

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

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

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

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

/* Select */
select.form-control {
    cursor: pointer;
}

/* Checkbox & Radio */
.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 {
    cursor: pointer;
    user-select: none;
}

/* File Upload */
.form-file {
    position: relative;
    display: inline-block;
    cursor: pointer;
}

.form-file-input {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.form-file-label {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--gray-100);
    border: 2px dashed var(--gray-300);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-file:hover .form-file-label {
    background: var(--gray-200);
    border-color: var(--primary-color);
}

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

.alert-success {
    background: var(--secondary-bg);
    color: var(--secondary-dark);
    border-color: var(--secondary-color);
}

.alert-danger {
    background: #FEE2E2;
    color: #991B1B;
    border-color: var(--danger-color);
}

.alert-warning {
    background: #FEF3C7;
    color: #92400E;
    border-color: var(--warning-color);
}

.alert-info {
    background: var(--primary-bg);
    color: #1E40AF;
    border-color: var(--primary-color);
}

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

.alert-close {
    position: absolute;
    top: 50%;
    right: var(--spacing-md);
    transform: translateY(-50%);
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0.5;
    transition: opacity var(--transition-fast);
}

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

/* ==================== Progress Bars ==================== */
.progress {
    height: 0.5rem;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
    position: relative;
    overflow: hidden;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
    animation: shimmer 2s infinite;
}

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

.progress-lg {
    height: 1rem;
}

.progress-label {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--gray-600);
}

/* ==================== Video Player ==================== */
.video-container {
    position: relative;
    width: 100%;
    background: #000;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.video-container video {
    width: 100%;
    height: auto;
    max-height: 80vh;
    display: block;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-fast);
    pointer-events: none;
}

.video-container:hover .video-overlay {
    opacity: 1;
}

.video-progress-container {
    background: var(--gray-300);
    height: 6px;
    border-radius: 3px;
    overflow: hidden;
    margin: var(--spacing-md) 0;
}

.video-progress-bar {
    background: linear-gradient(90deg, var(--success-color), #22D3EE);
    height: 100%;
    transition: width 0.3s ease;
    border-radius: 3px;
}

/* ==================== Dashboard Statistics ==================== */
.stat-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: transform var(--transition-fast);
}

.stat-card:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    font-size: 1.5rem;
}

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

.stat-icon.success {
    background: var(--secondary-bg);
    color: var(--success-color);
}

.stat-icon.warning {
    background: #FEF3C7;
    color: var(--warning-color);
}

.stat-icon.danger {
    background: #FEE2E2;
    color: var(--danger-color);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-600);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-change {
    display: inline-flex;
    align-items: center;
    margin-top: var(--spacing-sm);
    font-size: 0.875rem;
    font-weight: 500;
}

.stat-change.positive {
    color: var(--success-color);
}

.stat-change.negative {
    color: var(--danger-color);
}

/* ==================== Tables ==================== */
.table-container {
    overflow-x: auto;
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table thead {
    background: var(--gray-50);
    border-bottom: 2px solid var(--gray-200);
}

.table th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--gray-100);
    color: var(--gray-900);
}

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

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

/* ==================== Badges ==================== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
    font-weight: 600;
    line-height: 1;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.badge-success {
    background: var(--secondary-bg);
    color: var(--secondary-dark);
}

.badge-warning {
    background: #FEF3C7;
    color: #92400E;
}

.badge-danger {
    background: #FEE2E2;
    color: #991B1B;
}

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

/* ==================== Modals ==================== */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: var(--z-modal-backdrop);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn var(--transition-fast);
}

.modal {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-2xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    z-index: var(--z-modal);
    animation: slideUp var(--transition-base);
}

.modal-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
}

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

.modal-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--spacing-md);
}

/* ==================== Animations ==================== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Loading Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.spinner-sm {
    width: 20px;
    height: 20px;
    border-width: 2px;
}

.spinner-lg {
    width: 60px;
    height: 60px;
    border-width: 4px;
}

/* ==================== Utilities ==================== */
/* Display */
.d-none { display: none !important; }
.d-block { display: block !important; }
.d-flex { display: flex !important; }
.d-inline { display: inline !important; }
.d-inline-block { display: inline-block !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-color) !important; }
.text-secondary { color: var(--secondary-color) !important; }
.text-success { color: var(--success-color) !important; }
.text-danger { color: var(--danger-color) !important; }
.text-warning { color: var(--warning-color) !important; }
.text-muted { color: var(--gray-500) !important; }

/* Background Colors */
.bg-primary { background-color: var(--primary-color) !important; }
.bg-secondary { background-color: var(--secondary-color) !important; }
.bg-success { background-color: var(--success-color) !important; }
.bg-danger { background-color: var(--danger-color) !important; }
.bg-warning { background-color: var(--warning-color) !important; }
.bg-light { background-color: var(--gray-100) !important; }
.bg-dark { background-color: var(--gray-800) !important; }

/* 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; }

.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; }

/* Borders */
.border { border: 1px solid var(--gray-300) !important; }
.border-0 { border: 0 !important; }
.border-top { border-top: 1px solid var(--gray-300) !important; }
.border-bottom { border-bottom: 1px solid var(--gray-300) !important; }
.border-left { border-left: 1px solid var(--gray-300) !important; }
.border-right { border-right: 1px solid var(--gray-300) !important; }

.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; }
.rounded-0 { border-radius: 0 !important; }

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

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

.h-25 { height: 25% !important; }
.h-50 { height: 50% !important; }
.h-75 { height: 75% !important; }
.h-100 { height: 100% !important; }
.h-auto { height: auto !important; }

/* ==================== Responsive Design ==================== */
/* Tablet (768px and below) */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .grid-cols-3 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .grid-cols-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .navbar-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        box-shadow: var(--shadow-lg);
        flex-direction: column;
        padding: var(--spacing-lg);
    }
    
    .navbar-menu.active {
        display: flex;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    
    .stat-card {
        padding: var(--spacing-md);
    }
    
    .modal {
        width: 95%;
        margin: var(--spacing-md);
    }
}

/* Mobile (480px and below) */
@media (max-width: 480px) {
    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: 1fr;
    }
    
    .btn {
        width: 100%;
        margin-bottom: var(--spacing-sm);
    }
    
    .card {
        border-radius: 0;
    }
    
    .table {
        font-size: 0.875rem;
    }
    
    .table th,
    .table td {
        padding: var(--spacing-sm);
    }
    
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.25rem; }
    h3 { font-size: 1.125rem; }
}

/* Large Screens (1280px and above) */
@media (min-width: 1280px) {
    .container {
        max-width: 1280px;
    }
    
    .grid-cols-lg-5 {
        grid-template-columns: repeat(5, 1fr);
    }
    
    .grid-cols-lg-6 {
        grid-template-columns: repeat(6, 1fr);
    }
}

/* ==================== Print Styles ==================== */
@media print {
    body {
        background: white;
        color: black;
    }
    
    .navbar,
    .sidebar,
    .btn,
    .alert-dismissible .alert-close,
    .no-print {
        display: none !important;
    }
    
    .container {
        max-width: 100%;
        padding: 0;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
        page-break-inside: avoid;
    }
    
    a {
        text-decoration: none;
        color: black;
    }
    
    a[href]::after {
        content: " (" attr(href) ")";
    }
}

/* ==================== Accessibility ==================== */
/* Focus Styles */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Skip to Content Link */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    text-decoration: none;
    z-index: 100;
}

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

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

/* Reduced Motion */
@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;
    }
}

/* ==================== Custom Components ==================== */
/* Lesson Navigation Sidebar */
.lesson-nav {
    position: sticky;
    top: 5rem;
    max-height: calc(100vh - 6rem);
    overflow-y: auto;
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
}

.lesson-item {
    padding: var(--spacing-md);
    border-left: 3px solid transparent;
    margin-bottom: var(--spacing-xs);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.lesson-item:hover {
    background: var(--gray-50);
    border-left-color: var(--primary-color);
}

.lesson-item.active {
    background: var(--primary-bg);
    border-left-color: var(--primary-color);
    font-weight: 600;
}

.lesson-item.completed {
    position: relative;
}

.lesson-item.completed::after {
    content: '✓';
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--success-color);
    font-weight: bold;
}

/* Certificate Badge */
.certificate-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: var(--radius-full);
    font-weight: bold;
    animation: pulse 2s infinite;
    box-shadow: var(--shadow-lg);
}

/* Upload Area */
.upload-area {
    border: 2px dashed var(--primary-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    transition: all var(--transition-base);
    cursor: pointer;
    background: var(--gray-50);
}

.upload-area:hover {
    background: var(--primary-bg);
    border-color: var(--primary-dark);
}

.upload-area.dragover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-dark);
}

.upload-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

/* Notification Toast */
.toast {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    background: var(--white);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    z-index: var(--z-tooltip);
    animation: slideUp var(--transition-base);
    min-width: 300px;
}

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

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

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

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

/* ==================== NeverBots Academy Specific ==================== */
.academy-hero {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: var(--spacing-3xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.academy-hero::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="%23ffffff20" d="M0,96L48,112C96,128,192,160,288,186.7C384,213,480,235,576,213.3C672,192,768,128,864,128C960,128,1056,192,1152,208C1248,224,1344,192,1392,176L1440,160L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>');
    background-size: cover;
    opacity: 0.3;
}

.academy-hero h1 {
    font-size: 3rem;
    margin-bottom: var(--spacing-lg);
    position: relative;
    color: white;
}

.academy-hero p {
    font-size: 1.25rem;
    opacity: 0.95;
    position: relative;
}

/* Course Progress Ring */
.progress-ring {
    position: relative;
    width: 120px;
    height: 120px;
}

.progress-ring svg {
    transform: rotate(-90deg);
}

.progress-ring-circle {
    fill: none;
    stroke: var(--gray-200);
    stroke-width: 8;
}

.progress-ring-progress {
    fill: none;
    stroke: var(--primary-color);
    stroke-width: 8;
    stroke-linecap: round;
    transition: stroke-dashoffset 0.5s ease;
}

.progress-ring-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

/* ==================== End of Stylesheet ==================== */