/* ============================================================================ */
/* CRM LEARNING MANAGEMENT SYSTEM - MAIN CSS */
/* Updated for Modern Flat Design UI */
/* ============================================================================ */

/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

/* Import Professional Font */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, system-ui, sans-serif;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
    letter-spacing: -0.01em;
}

/* ============================================================================ */
/* CSS CUSTOM PROPERTIES (LIGHT THEME) */
/* ============================================================================ */

:root {
    /* Primary CRM Colors - Flat Design Blue Theme */
    --primary: #4FC3F7;
    --primary-hover: #29B6F6;
    --primary-light: rgba(79, 195, 247, 0.1);
    --primary-dark: #0288D1;

    /* Secondary Colors */
    --secondary: #64748b;
    --secondary-light: #94a3b8;
    --success: #22c55e;
    --success-light: rgba(34, 197, 94, 0.1);
    --warning: #f59e0b;
    --warning-light: rgba(245, 158, 11, 0.1);
    --danger: #ef4444;
    --danger-light: rgba(239, 68, 68, 0.1);
    --info: #06b6d4;
    --info-light: rgba(6, 182, 212, 0.1);

    /* Background Colors - Clean Flat Design */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-card: #ffffff;
    --bg-hover: #f1f5f9;
    --bg-muted: #e2e8f0;

    /* Text Colors */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-tertiary: #94a3b8;
    --text-inverse: #ffffff;
    --text-muted: #cbd5e1;

    /* Border Colors */
    --border-primary: #e2e8f0;
    --border-secondary: #cbd5e1;
    --border-focus: #4FC3F7;
    --border-light: #f1f5f9;

    /* Shadows - Subtle Flat Design */
    --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);
    --shadow-card: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);

    /* Font Weights */
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

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

    /* Border Radius - Flat Design */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;

    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;

    /* Layout Dimensions */
    --topbar-height: 64px;
    --sidebar-width: 280px;
    --sidebar-collapsed-width: 80px;
    --container-max-width: 1200px;

    /* Flat Design Specific */
    --card-padding: 1.5rem;
    --avatar-size: 44px;
}

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

h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-semibold);
    line-height: 1.25;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    letter-spacing: -0.025em;
}

h1 { font-size: 2.25rem; font-weight: var(--font-weight-bold); }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

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

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

a:hover {
    color: var(--primary-hover);
}

/* ============================================================================ */
/* CRM APP LAYOUT */
/* ============================================================================ */

.crm-admin {
    background-color: var(--bg-secondary);
}

.crm-app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ============================================================================ */
/* TOP NAVIGATION BAR */
/* ============================================================================ */

.crm-topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--topbar-height);
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.topbar-center {
    flex: 1;
    max-width: 600px;
    margin: 0 var(--spacing-xl);
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.mobile-menu-toggle:hover {
    background-color: var(--bg-hover);
}

.hamburger-line {
    display: block;
    width: 20px;
    height: 2px;
    background-color: var(--text-secondary);
    margin: 3px 0;
    transition: all var(--transition-fast);
    border-radius: 2px;
}

/* App Logo */
.app-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.app-title {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

/* Global Search */
.global-search {
    width: 100%;
    max-width: 500px;
}

.global-search .search-input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.global-search .search-input-group .search-icon {
    position: absolute;
    left: var(--spacing-md);
    color: var(--text-tertiary);
    pointer-events: none;
    z-index: 1;
}

.global-search .search-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) 2.5rem;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--border-focus);
    background-color: var(--bg-card);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.search-input::placeholder {
    color: var(--text-tertiary);
}

/* Topbar Buttons */
.topbar-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: none;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--text-secondary);
    min-height: 36px;
}

.topbar-btn:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-primary);
}

.theme-toggle {
    padding: var(--spacing-sm);
}

.theme-icon {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

.theme-toggle:hover .theme-icon {
    color: var(--text-primary);
}

/* Dropdown Styles */
.dropdown-toggle {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 200px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-sm);
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-fast);
}

.dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    width: 100%;
    text-align: left;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 0.875rem;
    text-decoration: none;
}

.dropdown-item:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.dropdown-item.active {
    background-color: var(--primary-light);
    color: var(--primary);
}

.dropdown-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-primary);
    margin-bottom: var(--spacing-sm);
}

.dropdown-divider {
    height: 1px;
    background-color: var(--border-primary);
    margin: var(--spacing-sm) 0;
}

.dropdown-arrow {
    transition: transform var(--transition-fast);
}

.dropdown-toggle.show .dropdown-arrow {
    transform: rotate(180deg);
}

/* Language Switcher */
.language-switcher .dropdown-menu {
    min-width: 160px;
}

.flag-icon {
    font-size: 1.125rem;
}

/* User Profile */
.user-profile-dropdown .dropdown-menu {
    min-width: 220px;
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
    font-weight: var(--font-weight-semibold);
    font-size: 0.875rem;
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.user-name {
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
    font-size: 0.875rem;
}

.user-info .user-name {
    font-weight: var(--font-weight-semibold);
    margin-bottom: 2px;
}

.user-role {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: capitalize;
}

.logout-form {
    width: 100%;
}

.logout-btn {
    width: 100%;
    text-align: left;
    color: var(--danger);
}

.logout-btn:hover {
    background-color: var(--danger-light);
    color: var(--danger);
}

/* ============================================================================ */
/* SIDEBAR NAVIGATION */
/* ============================================================================ */

.crm-sidebar {
    position: fixed;
    left: 0;
    top: var(--topbar-height);
    width: var(--sidebar-width);
    height: calc(100vh - var(--topbar-height));
    background-color: var(--bg-card);
    border-right: 1px solid var(--border-primary);
    z-index: 999;
    transition: transform var(--transition-normal);
    overflow-y: auto;
}

/* ============================================================================ */
/* MAIN CONTENT AREA */
/* ============================================================================ */

.crm-main-content {
    margin-top: var(--topbar-height);
    transition: margin-left var(--transition-normal);
    min-height: calc(100vh - var(--topbar-height));
    background-color: var(--bg-secondary);
}

.crm-main-content.with-sidebar {
    margin-left: var(--sidebar-width);
}

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

/* ============================================================================ */
/* FLASH NOTIFICATIONS */
/* ============================================================================ */

.flash-notification {
    position: fixed;
    top: calc(var(--topbar-height) + var(--spacing-lg));
    right: var(--spacing-lg);
    max-width: 400px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: 10000;
    animation: slideInRight 0.3s ease-out;
}

.flash-content {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
}

.flash-icon {
    flex-shrink: 0;
    margin-top: 2px;
}

.flash-text {
    flex: 1;
    font-weight: var(--font-weight-medium);
    font-size: 0.875rem;
    line-height: 1.5;
}

.flash-close {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-tertiary);
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    flex-shrink: 0;
    margin-top: 2px; /* Align with icon */
}

.flash-close:hover {
    color: var(--text-secondary);
    background-color: var(--bg-hover);
}

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

.flash-success .flash-icon {
    color: var(--success);
}

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

.flash-error .flash-icon {
    color: var(--danger);
}

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

.flash-warning .flash-icon {
    color: var(--warning);
}

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

.flash-info .flash-icon {
    color: var(--info);
}

/* ============================================================================ */
/* BUTTONS - FLAT DESIGN */
/* ============================================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    line-height: 1.5;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    transition: all var(--transition-fast);
    cursor: pointer;
    text-decoration: none;
    min-height: 40px;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--bg-card);
    color: var(--text-primary);
    border-color: var(--border-primary);
}

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

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

.btn-success:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-danger:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

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

.btn-full {
    width: 100%;
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.75rem;
    min-height: 32px;
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    min-height: 48px;
}

/* ============================================================================ */
/* CARDS - FLAT DESIGN */
/* ============================================================================ */

.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    overflow: hidden;
    transition: all var(--transition-fast);
}

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

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

.card-title {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin: 0;
}

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

.card-footer {
    padding: var(--card-padding);
    border-top: 1px solid var(--border-primary);
    background-color: var(--bg-secondary);
}

/* ============================================================================ */
/* FORMS - FLAT DESIGN */
/* ============================================================================ */

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.form-label {
    display: block;
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-size: 0.875rem;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-family: inherit;
    transition: all var(--transition-fast);
    background-color: var(--bg-card);
    color: var(--text-primary);
    min-height: 44px;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-tertiary);
}

.form-error {
    margin-top: var(--spacing-xs);
    font-size: 0.75rem;
    color: var(--danger);
    display: none;
}

.form-error.show {
    display: block;
}

/* ============================================================================ */
/* TABLES - FLAT DESIGN */
/* ============================================================================ */

.table-container {
    background-color: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}

.table thead {
    background-color: var(--bg-secondary);
}

.table th {
    padding: var(--spacing-lg);
    text-align: left;
    font-weight: var(--font-weight-semibold);
    font-size: 0.875rem;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--border-primary);
}

.table td {
    padding: var(--spacing-lg);
    vertical-align: middle;
    border-bottom: 1px solid var(--border-light);
    font-size: 0.875rem;
}

.table tbody tr {
    transition: background-color var(--transition-fast);
}

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

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

/* ============================================================================ */
/* STATUS BADGES - FLAT DESIGN */
/* ============================================================================ */

.status-badge {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: var(--font-weight-medium);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: 1px solid transparent;
}

.status-badge.active {
    background-color: var(--success-light);
    color: var(--success);
    border-color: rgba(34, 197, 94, 0.2);
}

.status-badge.blocked {
    background-color: var(--danger-light);
    color: var(--danger);
    border-color: rgba(239, 68, 68, 0.2);
}

.status-badge.enrolled {
    background-color: var(--info-light);
    color: var(--info);
    border-color: rgba(6, 182, 212, 0.2);
}

.status-badge.in_progress {
    background-color: var(--warning-light);
    color: var(--warning);
    border-color: rgba(245, 158, 11, 0.2);
}

.status-badge.completed {
    background-color: var(--success-light);
    color: var(--success);
    border-color: rgba(34, 197, 94, 0.2);
}

.status-badge.cancelled {
    background-color: var(--danger-light);
    color: var(--danger);
    border-color: rgba(239, 68, 68, 0.2);
}

/* ============================================================================ */
/* LOADING OVERLAY */
/* ============================================================================ */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.loading-spinner {
    position: relative;
    width: 60px;
    height: 60px;
    margin-bottom: var(--spacing-lg);
}

.spinner-ring {
    position: absolute;
    top: 0;
    left: 0;
    width: 60px;
    height: 60px;
    border: 3px solid transparent;
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    animation: spin 1.2s linear infinite;
}

.spinner-ring:nth-child(2) {
    animation-delay: -0.4s;
    border-top-color: var(--primary-hover);
}

.spinner-ring:nth-child(3) {
    animation-delay: -0.8s;
    border-top-color: var(--primary-light);
}

.loading-text {
    color: var(--text-inverse);
    font-weight: var(--font-weight-medium);
    font-size: 0.875rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ============================================================================ */
/* MODAL - FLAT DESIGN */
/* ============================================================================ */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.crm-modal {
    background-color: var(--bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow: hidden;
    transform: scale(0.9);
    transition: transform var(--transition-fast);
}

.modal-overlay.active .crm-modal {
    transform: scale(1);
}

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

.modal-title {
    margin: 0;
    color: var(--text-primary);
    font-weight: var(--font-weight-semibold);
}

.modal-close {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
    color: var(--text-tertiary);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background-color: var(--bg-hover);
    color: var(--text-secondary);
}

.modal-body {
    padding: var(--spacing-xl);
    text-align: center;
}

.modal-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-lg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-icon.warning {
    background-color: var(--warning-light);
    color: var(--warning);
}

.confirm-text {
    font-size: 1rem;
    color: var(--text-secondary);
    margin: 0;
}

.modal-footer {
    padding: var(--spacing-xl);
    border-top: 1px solid var(--border-primary);
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
}

/* ============================================================================ */
/* SIDEBAR OVERLAY FOR MOBILE */
/* ============================================================================ */

.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 998;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ============================================================================ */
/* ANIMATIONS */
/* ============================================================================ */

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

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

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

@media (max-width: 1024px) {
    .crm-main-content.with-sidebar {
        margin-left: 0;
    }

    .crm-sidebar {
        transform: translateX(-100%);
    }

    .crm-sidebar.mobile-open {
        transform: translateX(0);
    }

    .mobile-menu-toggle {
        display: flex;
    }
}

@media (max-width: 768px) {
    .topbar-center {
        display: none;
    }

    .page-content-container {
        padding: var(--spacing-sm);
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .flash-notification {
        top: calc(var(--topbar-height) + var(--spacing-sm));
        right: var(--spacing-sm);
        left: var(--spacing-sm);
        max-width: none;
    }

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

    /* Mobile Page Headers */
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-lg);
    }

    .header-right {
        width: 100%;
        justify-content: flex-end;
    }

    /* Mobile Courses Grid */
    .courses-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .course-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .course-stats {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .course-stats .stat-item {
        flex-direction: row;
        justify-content: space-between;
        padding: var(--spacing-sm);
        background-color: var(--bg-hover);
        border-radius: var(--radius-sm);
    }

    /* Mobile Email Stats */
    .stats-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

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

    .stat-icon {
        width: 50px;
        height: 50px;
        font-size: 2rem;
    }

    /* Mobile Campaign Cards */
    .campaign-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .campaign-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }

    .campaign-actions {
        flex-wrap: wrap;
        gap: var(--spacing-xs);
    }

    /* Mobile Pagination */
    .pagination-container {
        flex-direction: column;
        gap: var(--spacing-lg);
        text-align: center;
    }

    /* Mobile Forms */
    .form-container {
        padding: var(--spacing-lg);
    }

    .section-title {
        font-size: 1.125rem;
    }

    .form-actions {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .form-actions .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .topbar-right {
        gap: var(--spacing-sm);
    }

    .user-name {
        display: none;
    }

    .app-title {
        display: none;
    }

    /* Fix search input on small screens */
    .search-input-group .search-input {
        min-width: 150px;
        padding: var(--spacing-sm) var(--spacing-sm);
    }

    .search-select {
        min-width: 100px;
        font-size: 0.8rem;
    }

    .search-btn {
        min-width: 40px;
        padding: var(--spacing-sm);
    }
}

/* ============================================================================ */
/* PAGE HEADERS - FLAT DESIGN */
/* ============================================================================ */

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-primary);
}

.header-left {
    flex: 1;
}

.page-title {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.page-subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    margin: 0;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

/* ============================================================================ */
/* COURSES STYLES - FLAT DESIGN */
/* ============================================================================ */

.courses-container,
.create-course-container {
    background-color: var(--bg-secondary);
    min-height: calc(100vh - var(--topbar-height));
}

/* Filters Section */
.filters-section {
    margin-bottom: var(--spacing-2xl);
}

.search-box {
    max-width: 600px;
}

.search-form {
    width: 100%;
}

.search-input-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    background-color: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xs);
    box-shadow: var(--shadow-sm);
    position: relative;
}

.search-input-group .search-input {
    flex: 1;
    border: none;
    background: transparent;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    outline: none;
    min-width: 200px;
}

.search-input-group .search-input::placeholder {
    color: var(--text-tertiary);
}

.search-select {
    border: none;
    background: transparent;
    padding: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--text-secondary);
    outline: none;
    cursor: pointer;
    min-width: 140px;
    border-left: 1px solid var(--border-primary);
    margin-left: var(--spacing-xs);
    padding-left: var(--spacing-md);
}

.search-btn {
    background-color: var(--primary);
    color: var(--text-inverse);
    border: none;
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    min-width: 44px;
    height: 36px;
}

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

.search-btn .search-icon {
    font-size: 1rem;
    line-height: 1;
}

.search-icon {
    font-size: 1rem;
}

/* Courses Grid */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.course-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    transition: all var(--transition-fast);
    overflow: hidden;
    position: relative;
}

.course-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--border-focus);
}

.course-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-light);
}

.course-status .status-badge {
    font-size: 0.75rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.course-actions {
    position: relative;
}

.actions-btn {
    background: none;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-xs);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    min-width: 32px;
    min-height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.actions-btn:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.actions-icon {
    font-size: 1.2rem;
    transform: rotate(90deg);
}

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

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

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

.course-title a:hover {
    color: var(--primary);
}

.course-description {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
}

.course-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-light);
}

.course-price {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.price-amount {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    color: var(--primary);
}

.price-free {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    color: var(--success);
}

.price-label {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
}

.course-duration {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.course-footer {
    padding: var(--spacing-lg);
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-light);
}

.course-stats {
    display: flex;
    justify-content: space-around;
    gap: var(--spacing-md);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.stat-number {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    background-color: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.7;
}

.empty-state h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.empty-state p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* ============================================================================ */
/* FORMS - ENHANCED FLAT DESIGN */
/* ============================================================================ */

.form-container {
    background-color: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.course-form {
    max-width: 800px;
}

.form-section {
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--border-light);
}

.form-section:last-of-type {
    border-bottom: none;
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.section-title::before {
    content: '';
    width: 4px;
    height: 1.5rem;
    background-color: var(--primary);
    border-radius: var(--radius-sm);
}

.form-help {
    display: block;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-top: var(--spacing-xs);
    font-style: italic;
}

.required {
    color: var(--danger);
}

.form-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-light);
}

/* ============================================================================ */
/* EMAIL CAMPAIGNS - FLAT DESIGN */
/* ============================================================================ */

.emails-container {
    background-color: var(--bg-secondary);
    min-height: calc(100vh - var(--topbar-height));
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-card);
    padding: var(--spacing-xl);
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

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

/* Colored top border like dashboard */
.emails-container .stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary-hover) 100%);
}

.emails-container .stat-card:nth-child(2)::before {
    background: linear-gradient(90deg, var(--success) 0%, #16a34a 100%);
}

.emails-container .stat-card:nth-child(3)::before {
    background: linear-gradient(90deg, var(--warning) 0%, #d97706 100%);
}

.emails-container .stat-card:nth-child(4)::before {
    background: linear-gradient(90deg, var(--info) 0%, #0891b2 100%);
}

/* Stats layout like dashboard */
.emails-container .stat-card {
    display: block;
}

.emails-container .stat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.stat-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-light);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 1.5rem;
    flex-shrink: 0;
}

.emails-container .stat-card:nth-child(2) .stat-icon {
    background: var(--success-light);
    color: var(--success);
}

.emails-container .stat-card:nth-child(3) .stat-icon {
    background: var(--warning-light);
    color: var(--warning);
}

.emails-container .stat-card:nth-child(4) .stat-icon {
    background: var(--info-light);
    color: var(--info);
}

.emails-container .stat-trend {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    color: var(--success);
}

.emails-container .stat-content {
    margin-bottom: var(--spacing-md);
}

.emails-container .stat-content .stat-number {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    line-height: 1;
}

.emails-container .stat-content .stat-label {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: var(--font-weight-semibold);
}

.emails-container .stat-footer {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.emails-container .stat-extra {
    font-weight: var(--font-weight-medium);
}

.stat-content {
    flex: 1;
}

.stat-content .stat-number {
    font-size: 1.75rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

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

/* Campaigns List */
.campaigns-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.campaign-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: var(--spacing-xl);
    transition: all var(--transition-fast);
}

.campaign-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
    border-color: var(--border-focus);
}

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

.campaign-info {
    flex: 1;
}

.campaign-title {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-xs);
}

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

.campaign-title a:hover {
    color: var(--primary);
}

.campaign-subject {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.campaign-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.meta-label {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: var(--font-weight-medium);
}

.meta-value {
    font-size: 0.875rem;
    color: var(--text-primary);
    font-weight: var(--font-weight-medium);
}

.campaign-stats {
    display: flex;
    justify-content: space-around;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.campaign-stats .stat-item {
    text-align: center;
}

.campaign-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    justify-content: flex-end;
}

/* ============================================================================ */
/* PAGINATION - FLAT DESIGN */
/* ============================================================================ */

.pagination-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-xl);
    background-color: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
}

.pagination-info {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.pagination-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.pagination-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    background-color: var(--bg-card);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-fast);
    min-width: 40px;
    text-align: center;
}

.pagination-btn:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.pagination-btn.active {
    background-color: var(--primary);
    color: var(--text-inverse);
    border-color: var(--primary);
}

.pagination-btn.active:hover {
    background-color: var(--primary-hover);
}

/* New pagination component styles */
.pagination-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-md); /* Збільшена відстань між елементами */
}

.pagination-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    background-color: var(--bg-card);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-fast);
    min-width: 40px;
    text-align: center;
    gap: var(--spacing-xs);
}

.pagination-link:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.pagination-link.pagination-current {
    background-color: var(--primary);
    color: var(--text-inverse);
    border-color: var(--primary);
}

.pagination-link.pagination-current:hover {
    background-color: var(--primary-hover);
}

.pagination-ellipsis {
    color: var(--text-tertiary);
    padding: var(--spacing-sm);
    font-weight: var(--font-weight-medium);
}

.pagination-first,
.pagination-last,
.pagination-prev,
.pagination-next {
    font-weight: var(--font-weight-semibold);
}

.pagination-label {
    display: none;
}

/* Show labels on larger screens */
@media (min-width: 640px) {
    .pagination-label {
        display: inline;
    }
}

/* ============================================================================ */
/* ENHANCED FORM CONTROLS - FLAT DESIGN */
/* ============================================================================ */

.password-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.password-input-wrapper .form-input {
    padding-right: 3rem;
}

.password-toggle {
    position: absolute;
    right: var(--spacing-md);
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    color: var(--text-tertiary);
    transition: all var(--transition-fast);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
}

.password-toggle:hover {
    color: var(--text-secondary);
    background-color: var(--bg-hover);
}

.password-toggle-icon {
    font-size: 1rem;
    user-select: none;
}

/* Enhanced Dropdown for Better UX */
.dropdown-item-icon {
    width: 16px;
    height: 16px;
    margin-right: var(--spacing-sm);
    color: inherit;
}

/* Enhanced Button Loading States */
.btn-text {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.btn-loading {
    display: none;
    align-items: center;
    gap: var(--spacing-sm);
}

.btn.loading .btn-text {
    display: none;
}

.btn.loading .btn-loading {
    display: flex;
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Enhanced Focus States */
.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--primary-light);
    transform: translateY(-1px);
}

/* Better Visual Hierarchy for Forms */
.create-course-container,
.create-user-container {
    background-color: var(--bg-secondary);
    min-height: calc(100vh - var(--topbar-height));
}

/* Icon Styling for Better Consistency */
.btn-icon {
    font-size: 1rem;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

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

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-danger { color: var(--danger) !important; }

.d-flex { display: flex; }
.d-none { display: none; }
.d-block { display: block; }

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

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

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.ml-auto { margin-left: auto; }
.mr-auto { margin-right: auto; }

.w-full { width: 100%; }
.h-full { height: 100%; }

/* ============================================================================ */
/* COURSE EDIT PAGE - FLAT DESIGN */
/* ============================================================================ */

/* Edit Course Specific Styles */
.edit-course-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-2xl);
    align-items: start;
    margin-bottom: var(--spacing-2xl);
}

.edit-course-container .form-container {
    grid-column: 1;
}

.course-stats-card {
    grid-column: 2;
    background-color: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    position: sticky;
    top: var(--spacing-xl);
}

.course-stats-card .stats-header {
    padding: var(--spacing-xl);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-primary);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.course-stats-card .stats-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin: 0;
}

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

.course-stats-card .stats-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.course-stats-card .stat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--bg-hover);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.course-stats-card .stat-item:hover {
    background-color: var(--bg-secondary);
    transform: translateY(-1px);
}

.course-stats-card .stat-icon {
    font-size: 1.5rem;
    width: 40px;
    text-align: center;
    flex-shrink: 0;
}

.course-stats-card .stat-info {
    flex: 1;
}

.course-stats-card .stat-label {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

.course-stats-card .stat-value {
    font-size: 0.875rem;
    color: var(--text-primary);
    font-weight: var(--font-weight-semibold);
}

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

.input-group .form-input {
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
    border-right: none;
    flex: 1;
}

.input-group-text {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-muted);
    border: 1px solid var(--border-primary);
    border-left: none;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    white-space: nowrap;
}

.input-group:focus-within .input-group-text {
    border-color: var(--border-focus);
    background-color: var(--primary-light);
    color: var(--primary);
}

/* Enhanced Section Titles with Icons */
.form-section .section-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--primary-light);
    position: relative;
}

.form-section .section-title::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 60px;
    height: 2px;
    background-color: var(--primary);
    border-radius: var(--radius-sm);
}

/* Responsive Design for Edit Course */
@media (max-width: 1200px) {
    .edit-course-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .course-stats-card {
        grid-column: 1;
        position: static;
        order: -1;
    }

    .course-stats-card .stats-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
}

@media (max-width: 768px) {
    .course-stats-card .stats-grid {
        grid-template-columns: 1fr;
    }

    .input-group {
        flex-direction: column;
    }

    .input-group .form-input {
        border-radius: var(--radius-md);
        border-right: 1px solid var(--border-primary);
        margin-bottom: var(--spacing-xs);
    }

    .input-group-text {
        border-radius: var(--radius-md);
        border-left: 1px solid var(--border-primary);
        justify-content: center;
    }
}

/* ============================================================================ */
/* FORM CONTROLS - Modern Flat Design */
/* ============================================================================ */

.form-control, select.form-control {
    display: block;
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 0.95rem;
    font-weight: var(--font-weight-normal);
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    background-clip: padding-box;
    border: 1.5px solid var(--border-primary);
    appearance: none;
    border-radius: var(--radius-md);
    transition: all 0.15s ease-in-out;
    box-shadow: none;
}

.form-control:focus, select.form-control:focus {
    color: var(--text-primary);
    background-color: var(--bg-primary);
    border-color: var(--primary);
    outline: 0;
    box-shadow: 0 0 0 3px rgba(79, 195, 247, 0.1);
    transform: translateY(-1px);
}

.form-control::placeholder {
    color: var(--text-muted);
    opacity: 1;
    font-weight: var(--font-weight-normal);
}

.form-control:disabled {
    background-color: var(--bg-muted);
    border-color: var(--border-muted);
    color: var(--text-muted);
    cursor: not-allowed;
}

/* Select dropdown styling */
select.form-control {
    background-image: url("data:image/svg+xml;charset=utf-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%23666' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right var(--spacing-md) center;
    background-size: 16px 12px;
    padding-right: calc(var(--spacing-lg) + 32px);
    cursor: pointer;
}

select.form-control:focus {
    background-image: url("data:image/svg+xml;charset=utf-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='%234FC3F7' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='m2 5 6 6 6-6'/%3e%3c/svg%3e");
}

/* Form labels */
.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
    font-size: 0.9rem;
    letter-spacing: -0.01em;
}

.form-label .required {
    color: var(--danger);
    margin-left: 2px;
    font-weight: var(--font-weight-semibold);
}

/* Form help text */
.form-help {
    margin-top: var(--spacing-xs);
    font-size: 0.825rem;
    color: var(--text-muted);
    line-height: 1.4;
}

/* Form sections */
.form-section {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    margin-bottom: var(--spacing-xl);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.form-section:hover {
    border-color: var(--border-primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

/* Course info card */
.course-info-card {
    background: linear-gradient(135deg, var(--primary-light) 0%, rgba(79, 195, 247, 0.05) 100%);
    border: 1px solid var(--primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-top: var(--spacing-lg);
}

.course-info-card .course-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.course-info-card .course-title {
    color: var(--primary-dark);
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    margin: 0;
}

.course-info-card .course-price {
    background: var(--primary);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-weight: var(--font-weight-semibold);
    font-size: 0.9rem;
    white-space: nowrap;
}

.course-info-card .course-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-lg);
}

.course-info-card .course-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.course-info-card .meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
}

.course-info-card .meta-label {
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
}

.course-info-card .meta-value {
    color: var(--text-primary);
    font-weight: var(--font-weight-semibold);
}

/* Form actions */
.form-actions {
    display: flex;
    gap: var(--spacing-md);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-light);
    margin-top: var(--spacing-xl);
    justify-content: flex-end;
    flex-wrap: wrap;
}

.form-actions .btn {
    min-width: 140px;
}

/* Status badges in forms */
.status-published {
    color: var(--success);
    background-color: var(--success-light);
}

.status-draft {
    color: var(--warning);
    background-color: var(--warning-light);
}

.status-archived {
    color: var(--text-muted);
    background-color: var(--bg-muted);
}

/* Responsive form adjustments */
@media (max-width: 768px) {
    .form-section {
        padding: var(--spacing-lg);
    }
    
    .course-info-card {
        padding: var(--spacing-lg);
    }
    
    .course-info-card .course-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .form-actions .btn {
        width: 100%;
    }
}

/* ============================================================================ */
/* COURSE STATISTICS COMPACT */
/* ============================================================================ */

.course-stats-compact {
    grid-column: 1 / -1;
    margin-bottom: var(--spacing-lg);
}

.stats-card-compact {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    border: 1px solid var(--border-light);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.stats-title {
    margin: 0 0 var(--spacing-md) 0;
    color: var(--text-primary);
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.stats-title::before {
    content: '📊';
    font-size: 1.25rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.stat-compact {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
    transition: all 0.2s ease;
}

.stat-compact:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    border-color: var(--primary-light);
}

.stat-compact .stat-icon {
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--primary-light);
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.stat-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.stat-info .stat-number {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-info .stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
    text-transform: capitalize;
}

/* Responsive adjustments for compact stats */
@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
    
    .stat-compact {
        padding: var(--spacing-sm);
        gap: var(--spacing-sm);
    }
    
    .stat-compact .stat-icon {
        width: 36px;
        height: 36px;
        font-size: 1.25rem;
    }
    
    .stat-info .stat-number {
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================================================ */
/* COURSE MATERIALS SIDEBAR */
/* ============================================================================ */

.course-materials-sidebar {
    min-width: 300px;
    max-width: 400px;
}

.materials-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    border: 1px solid var(--border-light);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    height: fit-content;
    position: sticky;
    top: var(--spacing-lg);
}

.materials-card .card-header {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-light);
}

.materials-card .section-title {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.materials-card .section-title::before {
    content: '📚';
    font-size: 1.25rem;
}

.materials-content {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.9rem;
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* Grid adjustments for materials sidebar */
.course-detail-grid {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-xl);
    align-items: start;
}

/* Responsive adjustments for materials */
@media (max-width: 1200px) {
    .course-detail-grid {
        grid-template-columns: 1fr;
    }
    
    .course-materials-sidebar {
        min-width: unset;
        max-width: unset;
        order: 2;
    }
    
    .course-main-info {
        order: 1;
    }
}

/* ============================================================================ */
/* SETTINGS PAGE STYLES */
/* ============================================================================ */

.settings-container {
    max-width: 800px;
    margin: 0 auto;
}

.settings-section {
    margin-bottom: var(--spacing-2xl);
}

.section-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    overflow: hidden;
}

.card-header {
    padding: var(--spacing-xl);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-primary);
}

.section-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin: 0;
}

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

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.info-label {
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.info-value {
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-label {
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
}

.form-input {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.checkbox-label {
    font-size: 0.875rem;
    color: var(--text-primary);
    cursor: pointer;
}

.form-help {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-primary);
    margin: var(--spacing-xl) calc(-1 * var(--spacing-xl)) calc(-1 * var(--spacing-xl));
}

.form-error {
    color: var(--danger);
    font-size: 0.875rem;
    margin-top: var(--spacing-sm);
}

/* Settings Page Responsive Design */
@media (max-width: 768px) {
    .info-grid,
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .card-content,
    .card-header {
        padding: var(--spacing-lg);
    }
    
    .form-actions {
        padding: var(--spacing-lg);
        margin: var(--spacing-lg) calc(-1 * var(--spacing-lg)) calc(-1 * var(--spacing-lg));
    }
}