/* ============================================
   LMS Design System - Phase 1: Foundation
   ============================================ */

/* CSS Variables - Design Tokens */
:root {
    /* Colors - Primary Palette (Indigo/Violet) */
    --color-primary: #6366f1;
    /* Indigo 500 */
    --color-primary-dark: #4f46e5;
    /* Indigo 600 */
    --color-primary-light: #818cf8;
    /* Indigo 400 */
    --color-primary-bg: #eef2ff;
    /* Indigo 50 */

    /* Colors - Semantic */
    --color-success: #10b981;
    /* Emerald 500 */
    --color-success-bg: #ecfdf5;
    /* Emerald 50 */
    --color-error: #ef4444;
    /* Red 500 */
    --color-error-bg: #fef2f2;
    /* Red 50 */
    --color-warning: #f59e0b;
    /* Amber 500 */
    --color-warning-bg: #fffbeb;
    /* Amber 50 */
    --color-info: #3b82f6;
    /* Blue 500 */
    --color-info-bg: #eff6ff;
    /* Blue 50 */

    /* Colors - Neutral (Slate) */
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-family-mono: 'SF Mono', 'Fira Code', Consolas, monospace;

    --font-size-xs: 0.75rem;
    /* 12px */
    --font-size-sm: 0.875rem;
    /* 14px */
    --font-size-base: 1rem;
    /* 16px */
    --font-size-lg: 1.125rem;
    /* 18px */
    --font-size-xl: 1.25rem;
    /* 20px */
    --font-size-2xl: 1.5rem;
    /* 24px */
    --font-size-3xl: 1.875rem;
    /* 30px */
    --font-size-4xl: 2.25rem;
    /* 36px */
    --font-size-5xl: 3rem;
    /* 48px */

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

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

    /* Spacing */
    --spacing-xs: 0.25rem;
    /* 4px */
    --spacing-sm: 0.5rem;
    /* 8px */
    --spacing-md: 1rem;
    /* 16px */
    --spacing-lg: 1.5rem;
    /* 24px */
    --spacing-xl: 2rem;
    /* 32px */
    --spacing-2xl: 3rem;
    /* 48px */
    --spacing-3xl: 4rem;
    /* 64px */

    /* Border Radius */
    --radius-sm: 0.375rem;
    /* 6px */
    --radius-md: 0.5rem;
    /* 8px */
    --radius-lg: 0.75rem;
    /* 12px */
    --radius-xl: 1rem;
    /* 16px */
    --radius-2xl: 1.5rem;
    /* 24px */
    --radius-full: 9999px;

    /* Shadows - Diffused & Modern */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.03);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Layout */
    --container-max-width: 1280px;
    --header-height: 72px;
}

/* ============================================
   Base Styles
   ============================================ */

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

html {
    scroll-behavior: smooth;
}

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

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

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

h1 {
    font-size: var(--font-size-4xl);
}

h2 {
    font-size: var(--font-size-3xl);
}

h3 {
    font-size: var(--font-size-2xl);
}

h4 {
    font-size: var(--font-size-xl);
}

h5 {
    font-size: var(--font-size-lg);
}

h6 {
    font-size: var(--font-size-base);
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-gray-700);
}

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

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

/* ============================================
   Layout Components
   ============================================ */

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

.main-content {
    min-height: calc(100vh - var(--header-height));
    padding: var(--spacing-xl) 0;
}

/* Remove padding when landing hero is present */
body.landing-page .main-content {
    padding: 0;
}

/* ============================================
   Header & Navigation
   ============================================ */

.header {
    background: white;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--color-gray-200);
    transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
    border-bottom-color: var(--color-gray-300);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--header-height);
    gap: var(--spacing-lg);
    width: 100%;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    gap: var(--spacing-lg);
    padding: 0 var(--spacing-lg);
}

.navbar-brand {
    flex-shrink: 0;
    order: 1;
}

.navbar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    flex: 1;
    justify-content: flex-end;
    min-width: 0;
    flex-wrap: nowrap;
    order: 3;
}

/* Primary Navigation Links (Public Header) */
.navbar-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-right: var(--spacing-lg);
}

.navbar-nav-link {
    color: var(--color-gray-700);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.navbar-nav-link:hover {
    color: var(--color-primary);
    background-color: var(--color-gray-50);
}

.navbar-brand a {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: transform var(--transition-fast);
}

.navbar-brand a:hover {
    transform: scale(1.05);
}

.navbar-search {
    flex: 0 0 auto;
    max-width: 400px;
    min-width: 250px;
}

.navbar-search form {
    display: flex;
    gap: var(--spacing-sm);
}

.navbar-search input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

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

.navbar-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex: 0 0 auto;
    white-space: nowrap;
    flex-wrap: nowrap;
    overflow: hidden;
}

/* Ensure CTA buttons in navbar-menu are consistently sized */
.navbar-menu .btn {
    white-space: nowrap;
    flex-shrink: 0;
}

.navbar-link {
    color: var(--color-gray-700);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
}

.navbar-link:hover {
    background-color: var(--color-gray-100);
    color: var(--color-primary);
}

.navbar-user {
    color: var(--color-gray-600);
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    white-space: nowrap;
    flex-shrink: 0;
}

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

.footer {
    background-color: var(--color-gray-800);
    color: var(--color-gray-300);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    margin-top: var(--spacing-3xl);
    border-top: 1px solid var(--color-gray-700);
}

body.landing-page .footer {
    margin-top: 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-column {
    display: flex;
    flex-direction: column;
}

.footer-brand {
    color: white;
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
    line-height: var(--line-height-tight);
}

.footer-brand-accent {
    color: var(--color-primary-light);
}

.footer-tagline {
    color: var(--color-gray-400);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    margin: 0;
    margin-bottom: var(--spacing-sm);
}

.footer-description {
    color: var(--color-gray-500);
    font-size: var(--font-size-xs);
    line-height: var(--line-height-relaxed);
    margin: 0;
    margin-top: var(--spacing-md);
    max-width: 300px;
}

.footer-heading {
    color: white;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-tight);
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links li {
    margin: 0;
}

.footer-links a {
    color: var(--color-gray-400);
    font-size: var(--font-size-sm);
    text-decoration: none;
    transition: color var(--transition-fast);
    display: inline-block;
}

.footer-links a:hover {
    color: var(--color-primary-light);
}

.footer-bottom {
    border-top: 1px solid var(--color-gray-700);
    padding-top: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-copyright {
    margin: 0;
    color: var(--color-gray-400);
    font-size: var(--font-size-sm);
}

.footer-credit {
    margin: 0;
    color: var(--color-gray-400);
    font-size: var(--font-size-xs);
}

.footer p {
    text-align: center;
    margin: 0;
    color: var(--color-gray-400);
    font-size: var(--font-size-sm);
}

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

.alert {
    padding: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    border-radius: var(--radius-md);
    border-left: 4px solid;
    display: flex;
    align-items: start;
    gap: var(--spacing-md);
}

.alert-success {
    background-color: var(--color-success-bg);
    color: #065f46;
    border-color: var(--color-success);
}

.alert-error {
    background-color: var(--color-error-bg);
    color: #991b1b;
    border-color: var(--color-error);
}

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

.alert-info {
    background-color: var(--color-info-bg);
    color: #1e40af;
    border-color: var(--color-info);
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    z-index: 1001;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-gray-700);
    border-radius: 2px;
    transition: all var(--transition-base);
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Mobile Drawer Default (Hidden on Desktop) */
.mobile-drawer,
.drawer-backdrop {
    display: none;
}

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

/* Tablet and below */
@media (max-width: 1024px) {
    .container {
        padding: 0 var(--spacing-lg);
    }

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

/* Tablet */
@media (max-width: 1024px) and (min-width: 769px) {
    .navbar-search {
        max-width: 300px;
        min-width: 200px;
    }

    .navbar-menu {
        gap: var(--spacing-sm);
    }
    
    /* Allow CTA buttons to wrap on very small screens */
    .navbar-menu .btn {
        font-size: var(--font-size-xs);
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .navbar-link {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: var(--font-size-xs);
    }
    
    .navbar-nav {
        gap: var(--spacing-sm);
    }
    
    .navbar-nav-link {
        font-size: var(--font-size-xs);
        padding: var(--spacing-xs);
    }
    
    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr;
        gap: var(--spacing-xl);
    }
}

/* Mobile */
@media (max-width: 768px) {
    .navbar {
        position: relative;
        flex-wrap: nowrap;
        height: var(--header-height);
        padding: 0;
    }

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

    .navbar-right {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
    }

    .navbar-search {
        display: none;
    }
    
    .navbar-nav {
        display: none;
    }

    .navbar-menu {
        display: none;
        /* Hide default navbar on mobile */
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-lg);
    }
    
    .footer-column:first-child {
        grid-column: 1 / -1;
    }

    /* Mobile Drawer Styles */
    .mobile-drawer {
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        width: 280px;
        background: white;
        z-index: 2000;
        transform: translateX(100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: var(--shadow-xl);
        display: flex;
        flex-direction: column;
    }

    .mobile-drawer.is-open {
        transform: translateX(0);
    }

    .drawer-backdrop {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 1900;
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.3s ease;
        backdrop-filter: blur(2px);
    }

    .drawer-backdrop.is-open {
        opacity: 1;
        pointer-events: auto;
    }

    .drawer-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: var(--spacing-md) var(--spacing-lg);
        border-bottom: 1px solid var(--color-gray-100);
    }

    .drawer-title {
        font-size: var(--font-size-lg);
        font-weight: var(--font-weight-bold);
        color: var(--color-gray-900);
        margin: 0;
    }

    .drawer-close {
        background: none;
        border: none;
        font-size: var(--font-size-xl);
        color: var(--color-gray-500);
        cursor: pointer;
        padding: var(--spacing-xs);
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .drawer-content {
        flex: 1;
        overflow-y: auto;
        padding: var(--spacing-md);
    }

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

    .drawer-link {
        display: flex;
        align-items: center;
        gap: var(--spacing-md);
        padding: var(--spacing-sm) var(--spacing-md);
        color: var(--color-gray-700);
        text-decoration: none;
        font-weight: var(--font-weight-medium);
        border-radius: var(--radius-md);
        transition: all var(--transition-fast);
        width: 100%;
        justify-content: flex-start;
    }
    
    /* Ensure CTA links in drawer have proper spacing */
    .drawer-nav .drawer-link.text-primary {
        margin-top: var(--spacing-xs);
    }
    
    .drawer-nav .drawer-link.text-primary + .drawer-link.text-primary {
        margin-top: var(--spacing-xs);
    }

    .drawer-link:hover,
    .drawer-link:active {
        background-color: var(--color-gray-50);
        color: var(--color-primary);
    }

    .drawer-link i {
        font-size: var(--font-size-lg);
    }

    .drawer-divider {
        height: 1px;
        background-color: var(--color-gray-100);
        margin: var(--spacing-sm) 0;
    }

    .drawer-user-profile {
        display: flex;
        align-items: center;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-md);
        background-color: var(--color-gray-50);
        border-radius: var(--radius-md);
    }

    .drawer-avatar {
        width: 40px;
        height: 40px;
        border-radius: var(--radius-full);
        background: var(--color-primary);
        color: white;
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: bold;
    }

    /* Dark Mode Overrides for Drawer */
    [data-theme="dark"] .mobile-drawer {
        background: var(--color-gray-900);
        border-left: 1px solid var(--color-gray-800);
    }

    [data-theme="dark"] .drawer-header {
        border-bottom-color: var(--color-gray-800);
    }

    [data-theme="dark"] .drawer-title {
        color: var(--color-gray-100);
    }

    [data-theme="dark"] .drawer-link {
        color: var(--color-gray-300);
    }

    [data-theme="dark"] .drawer-link:hover {
        background-color: var(--color-gray-800);
        color: var(--color-primary-light);
    }

    [data-theme="dark"] .drawer-user-profile {
        background-color: var(--color-gray-800);
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    h1 {
        font-size: var(--font-size-3xl);
    }

    h2 {
        font-size: var(--font-size-2xl);
    }

    h3 {
        font-size: var(--font-size-xl);
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .course-detail-header {
        grid-template-columns: 1fr;
    }

    .course-sidebar {
        position: static;
    }

    .flex {
        flex-wrap: wrap;
    }

    .btn {
        min-height: 44px;
        /* Touch target */
    }
    
    /* Ensure navbar CTAs wrap properly on very small screens */
    .navbar-menu {
        flex-wrap: wrap;
        gap: var(--spacing-xs);
    }
    
    .navbar-menu .btn {
        font-size: var(--font-size-xs);
        padding: var(--spacing-xs) var(--spacing-sm);
    }
}

/* Small mobile */
@media (max-width: 480px) {
    .navbar-brand a {
        font-size: var(--font-size-xl);
    }
    
    /* Ensure CTA buttons don't overlap on small screens */
    .navbar-menu {
        gap: var(--spacing-xs);
    }
    
    .navbar-menu .btn {
        font-size: var(--font-size-xs);
        padding: var(--spacing-xs) var(--spacing-sm);
        min-width: auto;
    }

    .main-content {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .footer-column:first-child {
        grid-column: 1;
    }
    
    .footer-links {
        margin-bottom: var(--spacing-md);
    }
    
    .footer-links li {
        margin-bottom: var(--spacing-xs);
    }
    
    .footer-description {
        max-width: 100%;
    }
    
    /* Footer bottom responsive at 375px */
    .footer-bottom {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
        padding-top: var(--spacing-md);
    }
    
    .footer-copyright,
    .footer-credit {
        font-size: var(--font-size-xs);
        word-wrap: break-word;
        overflow-wrap: break-word;
    }
}

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

    h1 {
        font-size: var(--font-size-2xl);
    }

    h2 {
        font-size: var(--font-size-xl);
    }

    h3 {
        font-size: var(--font-size-lg);
    }
}

/* ============================================
   Utilities
   ============================================ */

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

.text-right {
    text-align: right;
}

.mt-sm {
    margin-top: var(--spacing-sm);
}

.mt-md {
    margin-top: var(--spacing-md);
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mt-xl {
    margin-top: var(--spacing-xl);
}

.mb-sm {
    margin-bottom: var(--spacing-sm);
}

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

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

.mb-xl {
    margin-bottom: var(--spacing-xl);
}

.hidden {
    display: none;
}

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    text-decoration: none;
    z-index: 10000;
    border-radius: 0 0 var(--radius-md) 0;
}

.skip-link:focus {
    top: 0;
}

/* ============================================
   Course Detail Page Revamp
   ============================================ */

.course-detail-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

@media (min-width: 1024px) {
    .course-detail-grid {
        grid-template-columns: 1fr 340px;
    }
}

.sticky-sidebar {
    position: sticky;
    top: calc(var(--header-height, 70px) + var(--spacing-lg));
    z-index: 10;
}

.curriculum-list .lesson-item:first-child {
    border-top-left-radius: var(--radius-sm);
    border-top-right-radius: var(--radius-sm);
}

.curriculum-list .lesson-item:last-child {
    border-bottom: none;
    border-bottom-left-radius: var(--radius-sm);
    border-bottom-right-radius: var(--radius-sm);
}

.text-gray-900 {
    color: var(--color-gray-900);
}

.text-gray-700 {
    color: var(--color-gray-700);
}

.text-gray-600 {
    color: var(--color-gray-600);
}

.text-gray-500 {
    color: var(--color-gray-500);
}

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

.bg-gray-50 {
    background-color: var(--color-gray-50);
}

.bg-gray-100 {
    background-color: var(--color-gray-100);
}

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

.w-full {
    width: 100%;
}

.h-48 {
    height: 12rem;
}

.object-cover {
    object-fit: cover;
}

.rounded-full {
    border-radius: 9999px;
}

/* Utilities needed if not present */
.items-start {
    align-items: flex-start;
}

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

.tracking-wider {
    letter-spacing: 0.05em;
}

.uppercase {
    text-transform: uppercase;
}

.leading-relaxed {
    line-height: 1.625;
}

.prose {
    max-width: 65ch;
}

/* Mobile adaptation for new grid */
@media (max-width: 768px) {
    .sticky-sidebar {
        position: static;
    }
}
/* Lesson View Modernization */
.lesson-layout {
    display: grid;
    grid-template-columns: 320px 1800px; /* Base width for sidebar */
    grid-template-columns: 320px 1fr;
    height: calc(100vh - 64px); /* Assuming 64px header */
    overflow: hidden;
    background: var(--color-gray-50);
}

.lesson-sidebar {
    background: white;
    border-right: 1px solid var(--color-gray-200);
    display: flex;
    flex-direction: column;
    z-index: 10;
}

.sidebar-header {
    border-bottom: 1px solid var(--color-gray-100);
}

.sidebar-content {
    flex: 1;
}

.lesson-sidebar-item.active {
    background: var(--color-primary-bg);
    border-left: 3px solid var(--color-primary);
}

.lesson-sidebar-item.active .text-gray-900 {
    color: var(--color-primary);
}

.lesson-main {
    flex: 1;
    overflow-y: auto;
    position: relative;
    display: flex;
    flex-direction: column;
}

.lesson-player-section {
    flex: 1;
}

.theater-wrapper {
    background: #111;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
}

.video-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

.video-container video {
    display: block;
    width: 100%;
}

.pdf-container, .text-container {
    max-width: 1000px;
    margin: var(--spacing-xl) auto;
    width: 90%;
}

.tabs-modern {
    display: flex;
    gap: var(--spacing-lg);
    border-bottom: 1px solid var(--color-gray-100);
}

.tab-item {
    padding: var(--spacing-sm) 0;
    font-weight: var(--font-weight-semibold);
    color: var(--color-gray-500);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
}

.tab-item.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

/* Responsive Lesson Layout */
@media (max-width: 1024px) {
    .lesson-layout {
        grid-template-columns: 1fr;
        height: auto;
    }
    
    .lesson-sidebar {
        order: 2;
        height: auto;
        border-right: none;
        border-top: 1px solid var(--color-gray-200);
    }
    
    .lesson-main {
        order: 1;
    }
}

/* Profile Modernization */
.profile-header-new {
    background: white;
    border-radius: var(--radius-xl);
    overflow: hidden;
    position: relative;
    box-shadow: var(--shadow-md);
}

.profile-cover {
    height: 160px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    opacity: 0.9;
}

.profile-avatar-large {
    width: 140px;
    height: 140px;
    border-radius: var(--radius-full);
    border: 6px solid white;
    background: white;
    margin-top: -70px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.avatar-placeholder {
    width: 100%;
    height: 100%;
    background: var(--color-primary);
    color: white;
    font-size: 3rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.course-profile-card {
    display: block;
    text-decoration: none;
    height: 100%;
}

.badge-icon-small {
    width: 44px;
    height: 44px;
    background: var(--color-gray-50);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-gray-100);
}

.certificate-mini-card {
    text-decoration: none;
}

@media (max-width: 768px) {
    .grid { grid-template-columns: 1fr !important; }
    .profile-header-content { flex-direction: column; align-items: flex-start; }
    .profile-avatar-large { margin-top: -60px; width: 120px; height: 120px; }
}

/* Community Discovery Hub */
/* Page Header - Consistent styling */
.discovery-header {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
}

.filter-pill {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    background: white;
    color: var(--color-gray-700);
    font-weight: var(--font-weight-semibold);
    text-decoration: none;
    white-space: nowrap;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid var(--color-gray-200);
}

.filter-pill i {
    font-size: var(--font-size-base);
}

.filter-pill:hover {
    background: var(--color-gray-50);
    border-color: var(--color-primary-light);
    color: var(--color-primary);
    transform: translateY(-1px);
}

.filter-pill.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.2);
}

.filter-pill.active:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.search-box-modern {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box-modern i {
    position: absolute;
    left: var(--spacing-md);
    color: var(--color-gray-400);
    font-size: 1.25rem;
}

.search-box-modern input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md) var(--spacing-sm) 2.75rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-gray-200);
    background: var(--color-gray-50);
    transition: all 0.2s;
}

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

.community-discovery-card {
    cursor: pointer;
    overflow: hidden;
}

.community-icon-large {
    width: 64px;
    height: 64px;
    background: white;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    border: 4px solid white;
}

.member-stat, .post-stat {
    display: flex;
    align-items: center;
    gap: 4px;
}

.member-stack {
    display: flex;
    align-items: center;
}

/* Community Details & Feed */
/* Community hero styles moved to components.css for consistency */

.community-avatar-extra-large {
    width: 100px;
    height: 100px;
    background: white;
    border-radius: var(--radius-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    border: 6px solid rgba(255,255,255,0.2);
}

.feed-card {
    border: 1px solid var(--color-gray-100);
}

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

.avatar-sm {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--color-primary-bg);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-bold);
    font-size: 0.875rem;
}

/* Post Detail & Threaded Replies */
.avatar-md {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-bold);
    font-size: 1.25rem;
}

.avatar-xs {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    background: var(--color-gray-100);
    color: var(--color-gray-600);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-bold);
    font-size: 0.75rem;
}

.avatar-2xs {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-sm);
    background: var(--color-gray-50);
    color: var(--color-gray-500);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-bold);
    font-size: 0.65rem;
}

.reply-block {
    background: white;
    border-radius: var(--radius-lg);
    transition: all 0.2s;
}

.community-sticky {
    position: sticky;
    top: var(--spacing-xl);
}

/* Dashboard Components */
.bg-primary-light { background-color: rgba(79, 70, 229, 0.1); }
.bg-success-light { background-color: rgba(16, 185, 129, 0.1); }
.bg-warning-light { background-color: rgba(245, 158, 11, 0.1); }
.bg-info-light { background-color: rgba(59, 130, 246, 0.1); }

.text-primary { color: var(--color-primary); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-info { color: var(--color-info); }

.hover-scale {
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.hover-scale:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-xl);
}

.btn-full {
    width: 100%;
    justify-content: center;
}

.line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Quiz & Assessment Components */
.quiz-container { max-width: 800px; margin: 0 auto; }
.quiz-header-fixed {
    position: sticky;
    top: 70px;
    z-index: 50;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--color-gray-200);
}

.progress-container {
    height: 8px;
    background: var(--color-gray-100);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--color-primary);
    transition: width 0.4s ease;
}

.quiz-option-card {
    display: flex;
    align-items: center;
    padding: var(--spacing-lg);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.2s;
    background: white;
}

.quiz-option-card:hover {
    border-color: var(--color-primary-light);
    background: var(--color-gray-50);
}

.quiz-option-card.selected {
    border-color: var(--color-primary);
    background: rgba(79, 70, 229, 0.05);
}

.quiz-option-indicator {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid var(--color-gray-300);
    margin-right: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-weight: bold;
    color: var(--color-gray-500);
    transition: all 0.2s;
}

.selected .quiz-option-indicator {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: white;
}

.question-container {
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Assignment & Grading Components */
.dropzone {
    border: 2px dashed var(--color-gray-300);
    border-radius: var(--radius-xl);
    padding: 3rem;
    text-align: center;
    transition: all 0.2s;
    background: var(--color-gray-50);
    cursor: pointer;
}

.dropzone:hover, .dropzone.active {
    border-color: var(--color-primary);
    background: rgba(79, 70, 229, 0.05);
}

.timeline {
    display: flex;
    justify-content: space-between;
    position: relative;
    margin-bottom: var(--spacing-2xl);
    padding: 0 var(--spacing-md);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 28px;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-gray-200);
    z-index: 1;
    border-radius: var(--radius-full);
}

.timeline-step {
    position: relative;
    z-index: 2;
    background: transparent;
    text-align: center;
    flex: 1;
    padding: 0 var(--spacing-xs);
}

.timeline-step:first-child {
    padding-left: 0;
}

.timeline-step:last-child {
    padding-right: 0;
}

.step-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: white;
    border: 3px solid var(--color-gray-200);
    margin: 0 auto var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-gray-400);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-medium);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    position: relative;
}

.timeline-step.completed .step-icon,
.timeline-step.active .step-icon {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
    transform: scale(1.05);
}

.timeline-step.completed .step-icon::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--color-primary);
    opacity: 0.2;
    transform: scale(1.4);
    z-index: -1;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.2;
        transform: scale(1.4);
    }
    50% {
        opacity: 0.1;
        transform: scale(1.6);
    }
}

.timeline-step.active .step-icon {
    animation: activePulse 2s ease-in-out infinite;
}

@keyframes activePulse {
    0%, 100% {
        box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
    }
    50% {
        box-shadow: 0 4px 16px rgba(99, 102, 241, 0.5);
    }
}

.timeline-step-label {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-gray-500);
    transition: color 0.3s ease;
    margin-top: var(--spacing-xs);
}

.timeline-step.completed .timeline-step-label,
.timeline-step.active .timeline-step-label {
    color: var(--color-gray-900);
}

/* Connect completed steps with primary color line */
.timeline-step.completed::before {
    content: '';
    position: absolute;
    top: 28px;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-primary);
    z-index: 0;
    border-radius: var(--radius-full);
}

/* For completed steps that aren't first, extend line from previous step */
.timeline-step.completed:not(:first-child)::before {
    left: -50%;
    right: 0;
}

/* Connect active step - line extends from left to center */
.timeline-step.active::before {
    content: '';
    position: absolute;
    top: 28px;
    left: 0;
    right: 50%;
    height: 3px;
    background: var(--color-primary);
    z-index: 0;
    border-radius: var(--radius-full);
}

/* If previous step is completed, extend line from previous step */
.timeline-step.completed + .timeline-step.active::before {
    left: -50%;
    right: 50%;
}

/* Gamification & Achievements */
.streak-card {
    background: linear-gradient(135deg, #FF5F6D 0%, #FFC371 100%);
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: 0 4px 15px rgba(255, 95, 109, 0.3);
    transition: transform 0.2s;
    flex-shrink: 0;
    min-width: 0;
}

.streak-card:hover {
    transform: translateY(-2px);
}

.streak-icon {
    font-size: 2.5rem;
    animation: flame 2s infinite alternate;
}

@keyframes flame {
    0% { transform: scale(1); filter: drop-shadow(0 0 5px rgba(255,255,255,0.5)); }
    100% { transform: scale(1.1); filter: drop-shadow(0 0 15px rgba(255,255,255,0.8)); }
}

.badge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: var(--spacing-md);
}

.badge-item {
    text-align: center;
    transition: all 0.2s;
}

.badge-item:hover {
    transform: scale(1.1);
}

.badge-icon-lg {
    width: 64px;
    height: 64px;
    background: var(--color-gray-50);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-xs);
    font-size: 1.75rem;
    border: 2px solid var(--color-gray-100);
}

.badge-item.locked .badge-icon-lg {
    filter: grayscale(1);
    opacity: 0.5;
}

.badge-item.new .badge-icon-lg {
    border-color: var(--color-warning);
    box-shadow: 0 0 10px var(--color-warning-light);
}

.progress-circle-container {
    width: 100px;
    height: 100px;
}

/* Certificate Design */
.certificate-container {
    max-width: 100%;
    margin: 0 auto;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    overflow: hidden;
    width: 100%;
}

@media (min-width: 1024px) {
    .certificate-container {
        max-width: 900px;
    }
}

.certificate-border {
    border: 8px solid;
    border-image: linear-gradient(135deg, #FFD700, #FFA500) 1;
    padding: 3rem;
    position: relative;
}

.certificate-seal {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #FFD700, #FFA500);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    box-shadow: 0 4px 15px rgba(255, 215, 0, 0.4);
}

.certificate-signature {
    border-top: 2px solid var(--color-gray-300);
    padding-top: var(--spacing-xs);
    margin-top: var(--spacing-md);
}

.qr-placeholder {
    width: 100px;
    height: 100px;
    background: var(--color-gray-100);
    border: 2px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    color: var(--color-gray-500);
    text-align: center;
}