/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    height: 100%;
    scroll-behavior: smooth;
}

/* Difficulty Sections */
.difficulty-sections {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.difficulty-card {
    background: white;
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.difficulty-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
}

.difficulty-card:nth-child(1)::before {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.difficulty-card:nth-child(2)::before {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

.difficulty-card:nth-child(3)::before {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
}

.difficulty-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
    border-color: #6366f1;
}

.difficulty-card:nth-child(1):hover {
    border-color: #10b981;
}

.difficulty-card:nth-child(2):hover {
    border-color: #f59e0b;
}

.difficulty-card:nth-child(3):hover {
    border-color: #ef4444;
}

.difficulty-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.difficulty-header i {
    font-size: 2rem;
    color: #6366f1;
}

.difficulty-card:nth-child(1) .difficulty-header i {
    color: #10b981;
}

.difficulty-card:nth-child(2) .difficulty-header i {
    color: #f59e0b;
}

.difficulty-card:nth-child(3) .difficulty-header i {
    color: #ef4444;
}

.difficulty-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
    color: #1f2937;
}

.difficulty-card p {
    color: #6b7280;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.topic-list {
    list-style: none;
    padding: 0;
    margin: 0 0 2rem 0;
}

.topic-list li {
    color: #4b5563;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.start-btn {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    color: white;
    border: none;
    padding: 0.75rem 2rem;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
    font-size: 1rem;
}

.difficulty-card:nth-child(1) .start-btn {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.difficulty-card:nth-child(2) .start-btn {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

.difficulty-card:nth-child(3) .start-btn {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
}

.start-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(99, 102, 241, 0.3);
}

.difficulty-card:nth-child(1) .start-btn:hover {
    box-shadow: 0 8px 20px rgba(16, 185, 129, 0.3);
}

.difficulty-card:nth-child(2) .start-btn:hover {
    box-shadow: 0 8px 20px rgba(245, 158, 11, 0.3);
}

.difficulty-card:nth-child(3) .start-btn:hover {
    box-shadow: 0 8px 20px rgba(239, 68, 68, 0.3);
}

/* Topics Grid (legacy - keeping for compatibility) */
.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed; /* This prevents gradient from moving with scroll */
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: #6366f1;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: #374151;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

.nav-link:hover {
    background: #6366f1;
    color: white;
}

/* Main content */
.main {
    flex: 1;
    padding: 2rem 0; /* Normal padding since no footer */
}

.page {
    display: none;
}

.page.active {
    display: block;
}

/* Hero section */
.hero {
    text-align: center;
    margin-bottom: 2rem; /* Increased to add space between subtitle and card */
    color: white;
    max-width: 800px;
}

.hero-title {
    font-size: 2rem; /* Further reduced from 2.2rem */
    font-weight: 700;
    margin-bottom: 0.5rem; /* Further reduced margin */
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: 1rem; /* Slightly reduced */
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.5;
}

/* Topics grid */
.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.topic-card {
    background: white;
    border-radius: 1rem;
    padding: 1.5rem;
    text-align: center;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
}

.topic-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    border-color: #6366f1;
}

.topic-icon {
    font-size: 2.5rem;
    color: #6366f1;
    margin-bottom: 0.8rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

.topic-name {
    font-size: 1.3rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 0.4rem;
}

.topic-description {
    color: #6b7280;
    margin-bottom: 1.2rem;
    font-size: 0.95rem;
    line-height: 1.4;
}

.topic-btn {
    background: #6366f1;
    color: white;
    border: none;
    padding: 0.75rem 2rem;
    border-radius: 0.5rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.topic-btn:hover {
    background: #4f46e5;
    transform: translateY(-2px);
}

/* Topic page */
.topic-header {
    display: flex;
    align-items: center;
    gap: 2rem;
    margin-bottom: 2rem;
    color: white;
}

.back-btn {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.back-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

#topic-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-transform: capitalize;
}

/* Flashcard */
.flashcard-container {
    display: flex;
    justify-content: center;
    margin-top: 2rem;
}

.flashcard {
    width: 600px;
    min-height: 400px;
    height: auto;
    perspective: 1000px;
}

.flashcard-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.flashcard.flipped .flashcard-inner {
    transform: rotateY(180deg);
}

.flashcard-front,
.flashcard-back {
    position: absolute;
    width: 100%;
    min-height: 100%;
    height: auto;
    backface-visibility: hidden;
    background: white;
    border-radius: 1rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 2rem;
}

.flashcard-back {
    transform: rotateY(180deg);
}

.card-content {
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    padding-top: 1rem;
    min-height: 300px;
}

.flashcard-back .card-content {
    justify-content: flex-start;
    align-items: stretch;
    min-height: auto;
}

.card-content h3 {
    font-size: 1.8rem;
    color: #1f2937;
    margin-bottom: 1rem;
}

.card-content p {
    color: #6b7280;
    font-size: 1.1rem;
    line-height: 1.6;
}

.question-section,
.answer-section,
.explanation-section {
    text-align: left;
    margin-bottom: 1.5rem;
}

.question-section h4,
.answer-section h4,
.explanation-section h4 {
    color: #6366f1;
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.question-section p {
    font-size: 1.2rem;
    font-weight: 500;
    color: #1f2937;
    line-height: 1.5;
}

.answer-section p {
    color: #059669;
    font-weight: 500;
    font-size: 1.1rem;
}

/* Answer actions section */
.answer-actions {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid #e5e7eb;
}

.answer-actions .new-question-btn {
    background: #7c3aed;
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    box-shadow: 0 4px 12px rgba(124, 58, 237, 0.3);
}

.answer-actions .new-question-btn:hover {
    background: #6d28d9;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(124, 58, 237, 0.4);
}

.explanation-section p {
    color: #4b5563;
    font-size: 1rem;
    line-height: 1.6;
}

/* Buttons */
.surprise-btn {
    background: linear-gradient(135deg, #326CE5 0%, #4285F4 100%);
    color: white;
    border: none;
    padding: 2rem 2.5rem;
    border-radius: 20px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 25px rgba(50, 108, 229, 0.3);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    min-width: 250px;
    text-align: center;
    position: relative;
    overflow: hidden;
    margin: 1rem auto;
}

.surprise-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.surprise-btn:hover::before {
    left: 100%;
}

.surprise-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(50, 108, 229, 0.4);
    background: linear-gradient(135deg, #2c5ce5 0%, #3d7bf4 100%);
}

.surprise-btn:active {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(50, 108, 229, 0.3);
}

.surprise-btn i {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: #ffffff;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

.surprise-btn .btn-text {
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.surprise-btn .btn-subtitle {
    font-size: 0.9rem;
    font-weight: 400;
    opacity: 0.9;
    margin-top: 0.3rem;
    line-height: 1.2;
}

.reveal-btn,
.new-question-btn,
.flip-back-btn {
    background: #6366f1;
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    margin: 0.25rem;
}

.reveal-btn:hover,
.new-question-btn:hover,
.flip-back-btn:hover {
    background: #4f46e5;
    transform: translateY(-2px);
}

.reveal-btn {
    background: #059669;
}

.reveal-btn:hover {
    background: #047857;
}

.new-question-btn {
    background: #7c3aed;
}

.new-question-btn:hover {
    background: #6d28d9;
}

.flip-back-btn {
    background: #6b7280;
}

.flip-back-btn:hover {
    background: #4b5563;
}

.card-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid #e5e7eb;
}

/* Answer actions section */
.answer-actions {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid #e5e7eb;
}

.answer-actions .new-question-btn {
    background: #7c3aed;
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    box-shadow: 0 4px 12px rgba(124, 58, 237, 0.3);
}

.answer-actions .new-question-btn:hover {
    background: #6d28d9;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(124, 58, 237, 0.4);
}

/* About page */
.about-content {
    background: white;
    border-radius: 1rem;
    padding: 3rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    max-width: 800px;
    margin: 0 auto;
}

.about-content h2 {
    color: #1f2937;
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
}

.about-content h3 {
    color: #6366f1;
    font-size: 1.5rem;
    margin: 2rem 0 1rem 0;
}

.about-content p,
.about-content li {
    color: #4b5563;
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 1rem;
}

.about-content ol,
.about-content ul {
    margin-left: 2rem;
    margin-bottom: 1.5rem;
}

/* Enhanced About page styles */
.creator-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 1rem;
    padding: 3rem;
    margin-bottom: 3rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.creator-info {
    display: flex;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.creator-photo {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.creator-text h2 {
    color: white;
    margin-bottom: 1rem;
    font-size: 2.2rem;
}

.creator-text h3 {
    color: rgba(255, 255, 255, 0.9);
    margin-top: 1.5rem;
    margin-bottom: 0.8rem;
    font-size: 1.3rem;
}

.creator-text p {
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.platform-section {
    background: white;
    border-radius: 1rem;
    padding: 3rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.certifications {
    background: #f8fafc;
    border-radius: 0.5rem;
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-left: 4px solid #10b981;
}

.certifications h4 {
    color: #059669;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.certifications ul {
    margin-left: 1rem;
}

.certifications li {
    color: #374151;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.topics-grid-about {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.topic-category {
    background: #f8fafc;
    border-radius: 0.5rem;
    padding: 1.5rem;
    border-top: 3px solid #6366f1;
}

.topic-category h4 {
    color: #6366f1;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.topic-category ul {
    margin-left: 0;
    list-style: none;
}

.topic-category li {
    color: #4b5563;
    padding: 0.3rem 0;
    padding-left: 1rem;
    position: relative;
}

.topic-category li::before {
    content: '▸';
    color: #6366f1;
    position: absolute;
    left: 0;
}

.contact-info {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 0.5rem;
    padding: 2rem;
    margin-top: 2rem;
    text-align: center;
}

.contact-info p {
    color: rgba(255, 255, 255, 0.95);
    font-size: 1.1rem;
    margin: 0;
}

/* AI Features and Community sections */
.ai-features {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 1rem;
    padding: 2.5rem;
    margin: 2rem 0;
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

.ai-features h3 {
    color: white;
    margin-bottom: 1rem;
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.ai-features p {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1rem;
}

.ai-features ul {
    margin-left: 1.5rem;
    margin-top: 1rem;
}

.ai-features li {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 0.8rem;
    line-height: 1.6;
}

.ai-features li strong {
    color: white;
    font-weight: 600;
}

.community-section {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    border-radius: 1rem;
    padding: 2.5rem;
    margin: 2rem 0;
    box-shadow: 0 8px 20px rgba(16, 185, 129, 0.3);
}

.community-section h3 {
    color: white;
    margin-bottom: 1rem;
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.community-section p {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.community-section strong {
    color: white;
    font-weight: 600;
}

/* Loading spinner */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    color: white;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

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

/* Multiple choice options */
.options-section {
    text-align: left;
    margin: 1.5rem 0;
}

.options-section h4 {
    color: #6366f1;
    font-size: 1.1rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.options-container {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.option-btn {
    background: #f8fafc;
    border: 2px solid #e2e8f0;
    color: #374151;
    padding: 1rem 1.5rem;
    border-radius: 0.75rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
    font-size: 1rem;
    font-weight: 500;
    width: 100%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.option-btn:hover:not(:disabled) {
    background: #f1f5f9;
    border-color: #6366f1;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.option-btn.selected {
    background: #ede9fe;
    border-color: #6366f1;
    color: #6366f1;
    font-weight: 600;
}

.option-btn.correct {
    background: #dcfce7;
    border-color: #16a34a;
    color: #16a34a;
    font-weight: 600;
}

.option-btn.incorrect {
    background: #fee2e2;
    border-color: #dc2626;
    color: #dc2626;
    font-weight: 600;
}

.option-btn:disabled {
    cursor: not-allowed;
    opacity: 0.9;
}

/* Reference link */
.reference-section {
    margin-top: 1rem;
    text-align: center;
}

.reference-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: #6366f1;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

.reference-link:hover {
    background: #ede9fe;
    transform: translateY(-1px);
}

/* Learning section */
.learning-section {
    margin: 0;
    display: flex;
    justify-content: center;
    width: 100%;
}

.kubernetes-card {
    max-width: 600px;
    width: 100%;
    margin: 0 auto;
    padding: 3rem 2.5rem;
    transform: scale(1.05);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.kubernetes-card .topic-icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
}

.kubernetes-card .topic-name {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.kubernetes-card .topic-description {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.kubernetes-card .topic-btn {
    padding: 1.2rem 3rem;
    font-size: 1.2rem;
    font-weight: 600;
}

/* Home page container for better layout proportions */
.home-container {
    min-height: calc(100vh - 280px); /* Much more compact - reduced from 200px */
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 0.5rem 0; /* Further reduced padding */
}

/* Responsive design */
@media (max-width: 1024px) {
    .container {
        padding: 0 15px;
    }
    
    .difficulty-sections {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 1.5rem;
        margin-top: 2rem;
    }
    
    /* Tablet styles for home page */
    .home-container {
        min-height: calc(100vh - 200px); /* More compact on tablet */
        padding: 0.5rem 0; /* Minimal padding */
    }
    
    .hero {
        margin-bottom: 1.5rem; /* Slightly less space on tablet */
    }
    
    .hero-title {
        font-size: 1.8rem; /* Smaller on tablet */
    }
    
    .hero-subtitle {
        font-size: 1.05rem;
    }
    
    .kubernetes-card {
        max-width: 500px;
        padding: 2.5rem 2rem;
        transform: scale(1.02);
    }
    
    .kubernetes-card .topic-icon {
        font-size: 3.5rem;
    }
    
    .kubernetes-card .topic-name {
        font-size: 1.8rem;
    }
    
    .kubernetes-card .topic-description {
        font-size: 1.1rem;
    }
    
    .kubernetes-card .topic-btn {
        padding: 1.1rem 2.5rem;
        font-size: 1.1rem;
    }
    
    .flashcard {
        width: 100%;
        max-width: 500px;
        height: 350px;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .flashcard {
        width: 100%;
        max-width: 500px;
        height: 350px;
    }
    
    .topics-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
        max-width: 400px;
    }
    
    /* Mobile styles for home page layout */
    .home-container {
        min-height: calc(100vh - 160px); /* Very compact on mobile */
        padding: 0.25rem 0; /* Minimal padding */
    }
    
    .hero {
        margin-bottom: 1.2rem; /* Less space on mobile */
    }
    
    .hero-title {
        font-size: 1.5rem; /* Much smaller title on mobile */
    }
    
    .hero-subtitle {
        font-size: 0.85rem; /* Smaller subtitle */
    }
    
    /* Mobile styles for learning section */
    .kubernetes-card {
        max-width: 90%;
        padding: 2rem 1.5rem;
        transform: scale(1);
    }
    
    .kubernetes-card .topic-icon {
        font-size: 3rem;
        margin-bottom: 1rem;
    }
    
    .kubernetes-card .topic-name {
        font-size: 1.6rem;
        margin-bottom: 0.8rem;
    }
    
    .kubernetes-card .topic-description {
        font-size: 1rem;
        margin-bottom: 1.5rem;
    }
    
    .kubernetes-card .topic-btn {
        padding: 1rem 2rem;
        font-size: 1rem;
    }

    .nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    .topic-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    #topic-title {
        font-size: 2rem;
    }
    
    .card-actions {
        flex-direction: column;
    }
    
    .surprise-btn,
    .reveal-btn,
    .new-question-btn,
    .flip-back-btn {
        width: 100%;
        justify-content: center;
    }
    
    .difficulty-sections {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        margin-top: 2rem;
    }
    
    .difficulty-card {
        padding: 1.5rem;
    }
}

@media (max-width: 768px) {
    .creator-info {
        flex-direction: column;
        text-align: center;
    }
    
    .creator-section,
    .platform-section {
        padding: 2.5rem;
    }
    
    .topics-grid-about {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
}

@media (max-width: 480px) {
    .flashcard {
        min-height: 350px;
        height: auto;
    }
    
    .card-content {
        padding: 1rem;
        gap: 1rem;
    }
    
    .flashcard-front,
    .flashcard-back {
        padding: 1.5rem;
    }
    
    .option-btn {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }
    
    .about-content {
        padding: 2rem;
    }
    
    /* Mobile styles for enhanced About page */
    .creator-info {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
    }
    
    .creator-photo {
        width: 120px;
        height: 120px;
    }
    
    .creator-section,
    .platform-section {
        padding: 2rem;
    }
    
    .creator-text h2 {
        font-size: 1.8rem;
    }
    
    .topics-grid-about {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .topic-category {
        padding: 1rem;
    }
    
    /* Mobile styles for topic cards */
    .topic-card {
        padding: 1.2rem;
    }
    
    .topic-icon {
        font-size: 2rem;
        margin-bottom: 0.6rem;
    }
    
    .topic-name {
        font-size: 1.1rem;
        margin-bottom: 0.3rem;
    }
    
    .topic-description {
        font-size: 0.9rem;
        margin-bottom: 1rem;
    }
    
    /* Mobile styles for AI features and community sections */
    .ai-features,
    .community-section {
        padding: 1.5rem;
        margin: 1.5rem 0;
    }
    
    .ai-features h3,
    .community-section h3 {
        font-size: 1.2rem;
        flex-direction: column;
        gap: 0.3rem;
    }
    
    .ai-features ul,
    .community-section ul {
        margin-left: 1rem;
    }
}