/*
 * EduGlow LMS - Premium Styling System
 * Typography: Outfit (Headings) & Inter (Body)
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

/* --- Theme Color Tokens --- */
:root {
    /* Light Mode (Default) */
    --bg-primary: #F8FAFC;
    --bg-secondary: #FFFFFF;
    --bg-surface: rgba(255, 255, 255, 0.7);
    --border-color: rgba(226, 232, 240, 0.8);
    
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #94A3B8;
    
    --accent-primary: #4F46E5;
    --accent-secondary: #7C3AED;
    --accent-gradient: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);
    --accent-light: rgba(79, 70, 229, 0.08);
    
    --success: #10B981;
    --danger: #EF4444;
    --warning: #F59E0B;
    --info: #06B6D4;
    
    --shadow-premium: 0 10px 30px -10px rgba(0, 0, 0, 0.04), 0 1px 3px rgba(0, 0, 0, 0.02);
    --shadow-glow: 0 0 20px rgba(79, 70, 229, 0.15);
    
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 24px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    /* Dark Mode Override */
    --bg-primary: #090D16;
    --bg-secondary: #111827;
    --bg-surface: rgba(17, 24, 39, 0.75);
    --border-color: rgba(255, 255, 255, 0.06);
    
    --text-primary: #F3F4F6;
    --text-secondary: #9CA3AF;
    --text-muted: #6B7280;
    
    --accent-primary: #6366F1;
    --accent-secondary: #8B5CF6;
    --accent-gradient: linear-gradient(135deg, #6366F1 0%, #8B5CF6 100%);
    --accent-light: rgba(99, 102, 241, 0.15);
    
    --shadow-premium: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.2);
}

/* --- Global Resets & Layout --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.4s ease, color 0.4s ease;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Outfit', sans-serif;
    color: var(--text-primary);
    font-weight: 600;
    line-height: 1.25;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition);
}
img.banner {
    border-radius: 10px;
}

input, button, select, textarea {
    font-family: inherit;
}

/* --- Containers --- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section-padding {
    padding: 6rem 0;
}

/* --- Navigation Header --- */
.header-nav {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--bg-surface);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 75px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    font-family: 'Outfit', sans-serif;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
    list-style: none;
}

.nav-link {
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 0.25rem 0;
}

.nav-link:hover, .nav-link.active {
    color: var(--accent-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: var(--transition);
}

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

.auth-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    gap: 0.5rem;
}

.btn:active {
    transform: scale(0.97);
}

.btn-primary {
    background: var(--accent-gradient);
    color: #FFFFFF !important;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.35);
}

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

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

.btn-icon {
    padding: 0.75rem;
    border-radius: 50%;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.btn-icon:hover {
    color: var(--accent-primary);
    border-color: var(--accent-primary);
    transform: rotate(15deg);
}

/* --- Theme Toggle Switch --- */
.theme-toggle-btn {
    cursor: pointer;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
}

/* --- Glassmorphism Card Style --- */
.glass-card {
    background-color: var(--bg-surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-premium);
    transition: var(--transition);
}

.glass-card:hover {
    transform: translateY(-5px);
    border-color: rgba(99, 102, 241, 0.25);
    box-shadow: var(--shadow-premium), var(--shadow-glow);
}

/* --- Typography Helpers --- */
.text-gradient {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-title-wrap {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 4rem auto;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

/* --- Hero Section --- */
.hero-sec {
    position: relative;
    padding: 3rem 0;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: aliceblue;
}
span.course-tag {
    display: none;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: center;
}

.hero-glow {
    position: absolute;
    width: 450px;
    height: 450px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.2) 0%, rgba(0,0,0,0) 70%);
    top: -10%;
    right: -10%;
    z-index: -1;
    filter: blur(40px);
}

.hero-heading {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 520px;
}

.hero-btns {
    display: flex;
    gap: 1.25rem;
    margin-bottom: 3.5rem;
}

.hero-stats {
    display: flex;
    gap: 3rem;
}

.stat-num {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
}

.stat-lbl {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* --- Category Grid --- */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.5rem;
}

.category-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 2.5rem 1.5rem;
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
}

.category-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
}

.category-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-sm);
    background: var(--accent-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-primary);
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

/* --- Featured Courses Grid --- */
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 2rem;
}

.course-card {
    border-radius: var(--radius-lg);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100%;
    box-shadow: var(--shadow-premium);
    transition: var(--transition);
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.08), var(--shadow-glow);
    border-color: rgba(99, 102, 241, 0.2);
}

.course-thumb-wrap {
    position: relative;
    padding-top: 56.25%; /* 16:9 Aspect Ratio */
    background-color: #E2E8F0;
    overflow: hidden;
}

.course-thumb {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.course-card:hover .course-thumb {
    transform: scale(1.05);
}

.course-tag {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: var(--accent-gradient);
    color: #FFFFFF;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 50px;
}

.course-card-body {
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.course-instructor {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.course-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    line-height: 1.35;
    min-height: 2.7rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    padding-bottom: 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.course-rating-star {
    color: #F59E0B;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-weight: 600;
}

.course-pricing-wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: auto;
}

.course-price {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
}

.price-now {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-primary);
}

.price-was {
    font-size: 0.95rem;
    text-decoration: line-through;
    color: var(--text-muted);
}

/* --- Why Choose Us --- */
.why-us-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.why-us-card {
    display: flex;
    gap: 1.5rem;
}

.why-us-icon-wrap {
    flex-shrink: 0;
    width: 55px;
    height: 55px;
    border-radius: var(--radius-md);
    background: var(--accent-light);
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
}

.why-us-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.why-us-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* --- Process Timeline --- */
.process-timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.process-timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 20px;
    height: 100%;
    width: 2px;
    background-color: var(--border-color);
}

.process-step {
    position: relative;
    padding-left: 60px;
    margin-bottom: 3.5rem;
}

.process-step:last-child {
    margin-bottom: 0;
}

.process-number {
    position: absolute;
    left: 0;
    top: 0;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--accent-gradient);
    color: #FFFFFF;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
    box-shadow: var(--shadow-glow);
}

.process-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.process-desc {
    color: var(--text-secondary);
}

/* --- Testimonials Slider --- */
.testimonial-container {
    max-width: 750px;
    margin: 0 auto;
    overflow: hidden;
    position: relative;
}

.testimonial-track {
    display: flex;
    width: 100%;
    transition: transform 0.5s ease-in-out;
}

.testimonial-slide {
    width: 100%;
    flex-shrink: 0;
    padding: 1rem;
}

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

.testimonial-quote {
    font-size: 1.35rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 2rem;
    line-height: 1.6;
    font-style: italic;
}

.testimonial-avatar {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    margin: 0 auto 1rem auto;
    object-fit: cover;
    border: 3px solid var(--accent-primary);
}

.testimonial-name {
    font-weight: 700;
    font-size: 1.1rem;
}

.testimonial-role {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.testimonial-controls {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 3rem;
}

/* --- FAQ Accordion --- */
.faq-accordion {
    max-width: 750px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-item {
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.faq-question {
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    user-select: none;
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--accent-primary);
}

.faq-icon {
    font-size: 1.25rem;
    transition: transform 0.3s ease;
}

.faq-answer {
    padding: 0 1.5rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-item.active .faq-answer {
    padding: 0 1.5rem 1.5rem 1.5rem;
    max-height: 250px;
}

/* --- Blog Section --- */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2.5rem;
}

@media (max-width: 992px) {
    .blog-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }
}

@media (max-width: 576px) {
    .blog-grid {
        grid-template-columns: 1fr;
    }
}

.blog-card {
    border-radius: var(--radius-lg);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.blog-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-premium);
    border-color: rgba(99, 102, 241, 0.2);
}

.blog-thumb-wrap {
    position: relative;
    padding-top: 52%;
    background-color: #E2E8F0;
}

.blog-thumb {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.blog-body {
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.blog-date {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.blog-title {
    font-size: 1.2rem;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 1rem;
}

.blog-desc {
    font-size: 0.92rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.blog-link {
    margin-top: auto;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--accent-primary);
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.blog-link:hover {
    gap: 0.5rem;
}

/* --- Footer --- */
.footer-wrap {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 5rem 0 3rem 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-logo-desc {
    color: var(--text-secondary);
    margin-top: 1.25rem;
    max-width: 320px;
}

.footer-heading {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-link {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.footer-link:hover {
    color: var(--accent-primary);
    padding-left: 4px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* --- Authentication Pages --- */
.auth-grid {
    display: grid;
    grid-template-columns: 1fr;
    min-height: 80vh;
    align-items: center;
    justify-content: center;
}

.auth-card-wrap {
    max-width: 480px;
    width: 100%;
    margin: 4rem auto;
}

.auth-card {
    padding: 3rem;
    border-radius: var(--radius-lg);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-premium);
}

.auth-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.auth-header h1 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.auth-header p {
    color: var(--text-secondary);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-size: 0.9rem;
    font-weight: 550;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-primary);
    background-color: var(--bg-secondary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

/* --- Student Dashboard & Sidebar --- */
.dashboard-grid {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 3rem;
    margin: 3rem 0;
}

.dashboard-sidebar {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    height: fit-content;
}

.sidebar-profile {
    text-align: center;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
}

.sidebar-profile-avatar {
    width: 65px;
    height: 65px;
    border-radius: 50%;
    background: var(--accent-gradient);
    color: #FFFFFF;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 0.75rem auto;
}

.sidebar-profile-name {
    font-weight: 700;
    font-size: 1.05rem;
}

.sidebar-profile-email {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.sidebar-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.sidebar-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    font-weight: 550;
    color: var(--text-secondary);
}

.sidebar-item:hover, .sidebar-item.active {
    background: var(--accent-light);
    color: var(--accent-primary);
}

.dashboard-panel {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    min-height: 550px;
}

.progress-bar-wrap {
    width: 100%;
    height: 8px;
    border-radius: 50px;
    background-color: var(--border-color);
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 50px;
    transition: width 0.5s ease;
}

/* --- Course Detail Layout --- */
.course-detail-hero {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 5rem 0;
}

.course-detail-grid {
    display: grid;
    grid-template-columns: 1.4fr 0.8fr;
    gap: 4rem;
}

.sidebar-sticky-card {
    position: sticky;
    top: 100px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-premium);
}

/* --- Curriculum Accordion --- */
.syllabus-wrap {
    margin-top: 2rem;
}

.syllabus-sec-head {
    background-color: var(--bg-primary);
    padding: 1rem 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    margin-bottom: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
}

.syllabus-lessons {
    list-style: none;
    padding: 0.5rem 1.5rem;
    border-left: 2px dashed var(--border-color);
    margin-left: 1rem;
    margin-bottom: 1rem;
}

.syllabus-lesson-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* --- Course Player Workplace --- */
.player-workspace {
    display: grid;
    grid-template-columns: 1fr 350px;
    height: calc(100vh - 75px);
    overflow: hidden;
}

.player-main {
    padding: 2.5rem;
    overflow-y: auto;
    background-color: var(--bg-primary);
}

.player-video-box {
    position: relative;
    padding-top: 56.25%;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-premium);
    margin-bottom: 2rem;
}

.player-video-box iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.player-sidebar {
    background-color: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    overflow-y: auto;
    padding: 1.5rem;
}

.player-sidebar h3 {
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1rem;
}

.sidebar-lesson-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.sidebar-lesson-link:hover, .sidebar-lesson-link.active {
    background-color: var(--accent-light);
    color: var(--accent-primary);
}

/* --- Certificate layout --- */
.cert-frame {
    width: 100%;
    max-width: 800px;
    margin: 4rem auto;
    background: #FFFFFF;
    color: #0F172A;
    border: 15px solid #0F172A;
    padding: 4rem;
    text-align: center;
    position: relative;
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
}

.cert-frame::before {
    content: '';
    position: absolute;
    top: 5px;
    left: 5px;
    right: 5px;
    bottom: 5px;
    border: 2px solid var(--accent-primary);
}

.cert-title {
    font-family: 'Outfit', sans-serif;
    font-size: 2.75rem;
    font-weight: 800;
    letter-spacing: 2px;
    margin-bottom: 1rem;
}

/* --- Flash Messages Alert --- */
#flash-message-alert {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
    max-width: 380px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-premium);
    animation: slideInRight 0.3s ease;
}

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

/* --- Mobile hamburger --- */
.nav-auth-mobile {
    display: none;
}

.menu-toggle {
    display: none;
    cursor: pointer;
    font-size: 1.5rem;
    transition: var(--transition);
}

.menu-toggle i {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Responsive Adjustments --- */
@media (max-width: 992px) {
    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }
    
    .hero-desc {
        margin: 0 auto 2.5rem auto;
    }
    
    .hero-btns {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
    }

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

    .player-workspace {
        grid-template-columns: 1fr;
        height: auto;
    }
    
    .player-sidebar {
        border-left: 0;
        border-top: 1px solid var(--border-color);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .header-container > .auth-actions {
        display: none;
    }

    .nav-links {
        display: flex;
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
        position: absolute;
        top: 75px;
        left: 0;
        width: 100%;
        background-color: var(--bg-secondary);
        padding: 1.5rem;
        border-bottom: 1px solid var(--border-color);
        z-index: 999;
        box-shadow: 0 15px 30px -10px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.05);
        list-style: none;
        
        /* Smooth transitions */
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1), 
                    transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), 
                    visibility 0.3s;
    }
    
    .nav-links.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    
    .nav-links li {
        width: 100%;
    }
    
    .nav-links li a.nav-link {
        display: block;
        padding: 0.75rem 1rem;
        border-radius: var(--radius-sm);
        font-size: 1rem;
        font-weight: 550;
        color: var(--text-secondary);
        width: 100%;
        transition: var(--transition);
    }
    
    .nav-links li a.nav-link:hover,
    .nav-links li a.nav-link.active {
        background-color: var(--accent-light);
        color: var(--accent-primary);
        padding-left: 1.5rem;
    }
    
    .nav-links li a.nav-link::after {
        display: none !important;
    }
    
    .nav-auth-mobile {
        display: flex;
        flex-direction: column;
        gap: 1rem;
        width: 100%;
        margin-top: 1rem;
        padding: 1.5rem 1rem 0.5rem 1rem;
        border-top: 1px solid var(--border-color);
    }
    
    .mobile-user-info {
        display: flex;
        flex-direction: column;
        gap: 0.75rem;
        align-items: center;
        width: 100%;
    }
    
    .mobile-greeting {
        font-weight: 600;
        font-size: 1rem;
        color: var(--text-primary);
    }
    
    .mobile-logout-btn {
        width: 100%;
        text-align: center;
        justify-content: center;
    }
    
    .mobile-auth-buttons {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.75rem;
        width: 100%;
    }
    
    .mobile-login-btn,
    .mobile-signup-btn {
        width: 100%;
        text-align: center;
        justify-content: center;
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .menu-toggle.active i {
        transform: rotate(90deg);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

/* --- Administrative Console Sidebar Layout --- */
.admin-body {
    background-color: var(--bg-primary);
    min-height: 100vh;
}

.admin-wrapper {
    display: flex;
    min-height: 100vh;
}

.admin-sidebar {
    width: 260px;
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    display: flex;
    flex-direction: column;
    padding: 2rem 1.5rem;
    transition: var(--transition);
    overflow-y: auto;
}

.admin-logo {
    font-size: 1.35rem;
    font-weight: 800;
    font-family: 'Outfit', sans-serif;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 2.5rem;
}

.admin-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    flex-grow: 1;
}

.admin-menu-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    font-weight: 550;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.admin-menu-item:hover, .admin-menu-item.active {
    background: var(--accent-light);
    color: var(--accent-primary);
}

.admin-menu-item i {
    width: 20px;
    font-size: 1rem;
}

.admin-sidebar-footer {
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
    margin-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.admin-content {
    flex-grow: 1;
    margin-left: 260px;
    padding: 3rem;
    min-height: 100vh;
    background-color: var(--bg-primary);
    transition: var(--transition);
}

.admin-topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.5rem;
}

/* Mobile Toggle elements */
.admin-mobile-header {
    display: none;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 99;
}

@media (max-width: 992px) {
    .admin-sidebar {
        transform: translateX(-100%);
    }
    
    .admin-sidebar.open {
        transform: translateX(0);
    }
    
    .admin-content {
        margin-left: 0;
        padding: 2rem 1.5rem;
    }
    
    .admin-mobile-header {
        display: flex;
    }

    /* Collapse multi-column grid layouts in admin console */
    .admin-content div[style*="display: grid"],
    .admin-content div[style*="display:grid"],
    .admin-content .course-detail-grid {
        grid-template-columns: 1fr !important;
        gap: 1.5rem !important;
    }

    /* Wrap flex rows like list headers and content lists */
    .admin-content div[style*="display: flex"][style*="justify-content: space-between"] {
        flex-direction: column !important;
        align-items: flex-start !important;
        gap: 1rem !important;
    }

    .admin-content div[style*="display: flex"][style*="justify-content: space-between"] .btn {
        width: 100% !important;
        text-align: center;
        justify-content: center;
    }

    /* Table responsive overflow containment */
    .admin-content table {
        display: block !important;
        width: 100% !important;
        overflow-x: auto !important;
        -webkit-overflow-scrolling: touch;
        white-space: nowrap;
    }
}

@media (max-width: 768px) {
    /* Collapse 2-column input blocks in form screens */
    .admin-content div[style*="grid-template-columns: repeat(2, 1fr)"],
    .admin-content div[style*="grid-template-columns:repeat(2,1fr)"],
    .admin-content div[style*="grid-template-columns: repeat(2,1fr)"],
    .admin-content div[style*="grid-template-columns:repeat(2, 1fr)"] {
        grid-template-columns: 1fr !important;
        gap: 1rem !important;
    }
}

/* --- Modern Blog Page Styles --- */
.blog-header-section {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 4rem 0;
    margin-bottom: 4rem;
}

.blog-layout-grid {
    display: grid;
    grid-template-columns: 1.45fr 0.55fr;
    gap: 3rem;
}

@media (max-width: 992px) {
    .blog-layout-grid {
        grid-template-columns: 1fr;
        gap: 4rem;
    }
}

.blog-main-content {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.blog-sidebar {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.sidebar-widget {
    padding: 2rem;
    border-radius: var(--radius-lg);
}

.widget-title {
    font-size: 1.25rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    letter-spacing: -0.02em;
    position: relative;
    color: var(--text-primary);
}

.widget-title::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--accent-gradient);
}

/* Sidebar Search */
.sidebar-search-bar {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.25rem 0.5rem 0.25rem 1.25rem;
    transition: var(--transition);
}

.sidebar-search-bar:focus-within {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.sidebar-search-bar .search-icon {
    color: var(--text-muted);
    font-size: 1rem;
    margin-right: 0.75rem;
}

.sidebar-search-bar input {
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-size: 0.95rem;
    flex-grow: 1;
    padding: 0.75rem 0;
    outline: none;
    width: 100%;
}

/* Sidebar Categories */
.sidebar-categories-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.category-link-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1.25rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 600;
    text-decoration: none;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

.category-link-item:hover, .category-link-item.active {
    background: var(--accent-light);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
    transform: translateX(4px);
}

.category-badge-count {
    font-size: 0.75rem;
    background: var(--bg-secondary);
    color: var(--text-muted);
    padding: 0.2rem 0.6rem;
    border-radius: 50px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.category-link-item:hover .category-badge-count, .category-link-item.active .category-badge-count {
    background: var(--accent-primary);
    color: #ffffff;
    border-color: var(--accent-primary);
}

/* Sidebar Recent Posts */
.sidebar-recent-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.recent-post-card {
    display: flex;
    gap: 1rem;
    text-decoration: none;
    align-items: center;
}

.recent-post-thumb {
    width: 70px;
    height: 70px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    flex-shrink: 0;
    border: 1px solid var(--border-color);
}

.recent-post-info {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.recent-post-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.35;
    margin-bottom: 0.25rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: var(--transition);
}

.recent-post-card:hover .recent-post-title {
    color: var(--accent-primary);
}

.recent-post-date {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Cards Row and Grid inside Main Column */
.blog-card-row {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
    gap: 2.5rem;
}

@media (max-width: 576px) {
    .blog-card-row {
        grid-template-columns: 1fr;
    }
}

/* Modern grid cards styling */
.blog-card-modern {
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    height: 100%;
    transition: var(--transition);
    box-shadow: var(--shadow-premium);
}

.blog-card-modern:hover {
    transform: translateY(-8px);
    border-color: rgba(99, 102, 241, 0.25);
    box-shadow: var(--shadow-premium), var(--shadow-glow);
}

.blog-card-thumb-wrap {
    position: relative;
    padding-top: 56.25%; /* 16:9 aspect ratio */
    overflow: hidden;
}

.blog-card-thumb {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.blog-card-modern:hover .blog-card-thumb {
    transform: scale(1.05);
}

.blog-card-badge {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: var(--bg-surface);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.3rem 0.8rem;
    border-radius: 50px;
    z-index: 2;
}

.blog-card-body {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.blog-card-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.blog-card-meta i {
    color: var(--accent-primary);
}

.blog-card-title {
    font-size: 1.35rem;
    font-weight: 750;
    line-height: 1.35;
    margin-bottom: 0.75rem;
}

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

.blog-card-title a:hover {
    color: var(--accent-primary);
}

.blog-card-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
    margin-bottom: 2rem;
}

.blog-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: auto;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border-color);
}

.blog-card-author {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 550;
}

.blog-card-link {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--accent-primary);
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    text-decoration: none;
    transition: var(--transition);
}

.blog-card-link:hover {
    gap: 0.5rem;
}

/* --- About Us Section Styles --- */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 4rem;
    align-items: center;
}

@media (max-width: 992px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: 3.5rem;
    }
}

.about-visual-wrap {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.about-glow {
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, rgba(0,0,0,0) 70%);
    z-index: 1;
    filter: blur(40px);
}

.about-card {
    position: relative;
    z-index: 2;
    padding: 1rem !important;
    width: 100%;
    max-width: 460px;
    overflow: visible;
}

.about-image {
    width: 100%;
    height: 340px;
    object-fit: cover;
    border-radius: var(--radius-md);
}

.about-experience-badge {
    position: absolute;
    bottom: -1.5rem;
    right: -1.5rem;
    background: var(--accent-gradient);
    color: #ffffff;
    padding: 1.25rem 1.75rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-glow), var(--shadow-premium);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 3;
}

@media (max-width: 576px) {
    .about-experience-badge {
        bottom: 1rem;
        right: 1rem;
        padding: 0.75rem 1.25rem;
    }
}

.about-experience-badge .exp-num {
    font-size: 1.8rem;
    font-weight: 850;
    line-height: 1.1;
}

.about-experience-badge .exp-lbl {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 0.25rem;
}

.about-content {
    display: flex;
    flex-direction: column;
}

.about-achievements {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-top: 1rem;
}

@media (max-width: 480px) {
    .about-achievements {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

.achievement-item {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.achievement-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    background: var(--accent-light);
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.achievement-count {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.2;
}

.achievement-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 550;
}