:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #8b5cf6;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --radius-sm: 8px;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-outline, .btn-large {
    display: inline-block;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
    font-size: 16px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
}

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

.btn-secondary {
    background: var(--bg-card);
    color: var(--primary);
    border: 2px solid var(--primary);
}

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

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-large {
    padding: 16px 32px;
    font-size: 18px;
}

.btn-full {
    width: 100%;
}

/* Landing Page */
.landing {
    min-height: 100vh;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 5%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo {
    font-size: 32px;
}

.brand-name {
    font-size: 24px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 16px;
}

.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 80px 5%;
    gap: 60px;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.badge {
    display: inline-block;
    padding: 8px 16px;
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    color: #92400e;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 24px;
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 48px;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.hero-illustration {
    flex: 1;
    position: relative;
    height: 400px;
}

.floating-card {
    position: absolute;
    background: white;
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    animation: float 3s ease-in-out infinite;
}

.card-icon {
    font-size: 48px;
}

.card-text {
    font-weight: 600;
    color: var(--text-primary);
}

.card-1 {
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.card-2 {
    top: 50%;
    right: 20%;
    animation-delay: 0.5s;
}

.card-3 {
    bottom: 20%;
    left: 30%;
    animation-delay: 1s;
}

.trophy-animation {
    position: absolute;
    top: 10%;
    right: 10%;
    font-size: 64px;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

@keyframes bounce {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    25% { transform: translateY(-10px) rotate(-5deg); }
    75% { transform: translateY(-10px) rotate(5deg); }
}

.features {
    padding: 80px 5%;
    background: white;
}

.section-title {
    text-align: center;
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.feature-card {
    padding: 32px;
    background: var(--bg-main);
    border-radius: var(--radius);
    text-align: center;
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 56px;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
}

.cta {
    padding: 80px 5%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    text-align: center;
}

.cta h2 {
    font-size: 42px;
    margin-bottom: 16px;
}

.cta p {
    font-size: 18px;
    margin-bottom: 32px;
    opacity: 0.9;
}

.footer {
    padding: 32px 5%;
    background: var(--text-primary);
    color: white;
    text-align: center;
}

/* Auth Pages */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.auth-container {
    width: 100%;
    max-width: 900px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.back-link {
    color: white;
    text-decoration: none;
    font-weight: 600;
    margin-bottom: 24px;
    display: inline-block;
    grid-column: 1 / -1;
}

.auth-box {
    background: white;
    padding: 48px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
}

.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.auth-header .logo {
    font-size: 64px;
    display: block;
    margin-bottom: 16px;
}

.auth-header h1 {
    font-size: 28px;
    margin-bottom: 8px;
}

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

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-weight: 600;
    font-size: 14px;
}

.form-group input, .form-group select, .form-group textarea {
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.form-group small {
    color: var(--text-secondary);
    font-size: 12px;
}

.error-message {
    padding: 12px;
    background: #fee;
    color: var(--danger);
    border-radius: var(--radius-sm);
    font-size: 14px;
    display: none;
}

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

.auth-footer {
    margin-top: 24px;
    text-align: center;
    color: var(--text-secondary);
}

.auth-footer a {
    color: var(--primary);
    font-weight: 600;
    text-decoration: none;
}

.auth-illustration .stat-card {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    padding: 24px;
    border-radius: var(--radius);
    color: white;
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.stat-icon {
    font-size: 48px;
}

.stat-info .stat-value {
    font-size: 24px;
    font-weight: 700;
}

.stat-info .stat-desc {
    opacity: 0.9;
}

.benefit-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: 12px;
    color: white;
    font-weight: 600;
    background: rgba(255, 255, 255, 0.1);
    padding: 16px;
    border-radius: var(--radius-sm);
}

.benefit-icon {
    font-size: 24px;
}

/* Dashboard */
.dashboard-page {
    background: var(--bg-main);
    min-height: 100vh;
}

.top-nav {
    background: white;
    padding: 16px 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    transition: background 0.3s;
}

.nav-link:hover {
    background: var(--bg-main);
}

.btn-logout {
    background: var(--danger);
    color: white;
    padding: 8px 20px;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 600;
}

.dashboard-container {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 32px;
    padding: 32px 5%;
    max-width: 1400px;
    margin: 0 auto;
}

.sidebar {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.user-card {
    background: white;
    padding: 24px;
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: var(--shadow);
}

.user-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    margin-bottom: 16px;
}

.user-avatar img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
}

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

.user-info h3 {
    margin-bottom: 8px;
}

.level-badge {
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    color: white;
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
}

.stats-card {
    background: white;
    padding: 24px;
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    gap: 16px;
    box-shadow: var(--shadow);
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    background: var(--bg-main);
    border-radius: var(--radius-sm);
}

.stat-item .stat-icon {
    font-size: 32px;
}

.stat-content {
    flex: 1;
}

.stat-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.progress-card {
    background: white;
    padding: 24px;
    border-radius: var(--radius);
    text-align: center;
    box-shadow: var(--shadow);
}

.progress-card h4 {
    margin-bottom: 16px;
}

.progress-ring {
    position: relative;
    width: 120px;
    height: 120px;
    margin: 0 auto;
}

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

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

.progress-ring-circle {
    fill: none;
    stroke: url(#gradient);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 314;
    stroke-dashoffset: 314;
    transition: stroke-dashoffset 1s ease;
}

.progress-percentage {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
}

.badges-preview {
    background: white;
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.badges-preview h4 {
    margin-bottom: 16px;
}

.badge-list {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 16px;
}

.badge-item {
    font-size: 32px;
}

.view-all {
    color: var(--primary);
    font-weight: 600;
    text-decoration: none;
}

.main-content {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.welcome-banner {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 48px;
    border-radius: var(--radius);
    text-align: center;
}

.welcome-banner h1 {
    font-size: 36px;
    margin-bottom: 8px;
}

.category-tabs {
    display: flex;
    gap: 12px;
    background: white;
    padding: 16px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow-x: auto;
}

.tab-btn {
    padding: 12px 24px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.3s;
    white-space: nowrap;
}

.tab-btn.active {
    background: var(--primary);
    color: white;
}

.materials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.material-card {
    background: white;
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
    text-decoration: none;
    color: inherit;
    display: block;
}

.material-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.material-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.material-category {
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
}

.category-HTML {
    background: #fee;
    color: #dc2626;
}

.category-CSS {
    background: #dbeafe;
    color: #2563eb;
}

.category-JavaScript {
    background: #fef3c7;
    color: #d97706;
}

.material-level {
    font-size: 12px;
    color: var(--text-secondary);
}

.material-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
}

.material-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 16px;
}

.material-points {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--warning);
    font-weight: 600;
}

.material-status {
    font-size: 24px;
}

.loading, .empty-state {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: white;
    padding: 48px;
    border-radius: var(--radius);
    max-width: 500px;
    text-align: center;
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.level-up-modal {
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    color: white;
}

.confetti {
    font-size: 64px;
    margin-bottom: 16px;
    animation: confettiPop 0.5s ease;
}

@keyframes confettiPop {
    0% { transform: scale(0); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.level-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    margin: 24px 0;
    font-size: 36px;
    font-weight: 700;
}

.badge-modal .badge-icon {
    font-size: 96px;
    margin: 24px 0;
    animation: badgeSpin 0.6s ease;
}

@keyframes badgeSpin {
    0% { transform: rotate(0deg) scale(0); }
    50% { transform: rotate(180deg) scale(1.1); }
    100% { transform: rotate(360deg) scale(1); }
}

/* Learn Page */
.learn-page {
    min-height: 100vh;
}

.lesson-progress {
    font-weight: 600;
}

.points-display {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-main);
    padding: 8px 16px;
    border-radius: 50px;
    font-weight: 700;
    color: var(--warning);
}

.learn-container {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 32px;
    padding: 32px 5%;
    max-width: 1400px;
    margin: 0 auto;
}

.lesson-sidebar {
    background: white;
    padding: 24px;
    border-radius: var(--radius);
    height: fit-content;
    position: sticky;
    top: 100px;
}

.lesson-sidebar h3 {
    margin-bottom: 16px;
}

.related-lessons {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.related-lesson-item {
    padding: 12px;
    background: var(--bg-main);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.3s;
    font-size: 14px;
}

.related-lesson-item:hover {
    background: var(--primary);
    color: white;
}

.lesson-content {
    background: white;
    padding: 48px;
    border-radius: var(--radius);
}

.lesson-meta {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
}

.lesson-category, .lesson-level {
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 14px;
    font-weight: 600;
}

.content-section {
    margin-bottom: 48px;
}

.content-section h2 {
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.markdown-content {
    line-height: 1.8;
    color: var(--text-secondary);
}

.markdown-content h1, .markdown-content h2, .markdown-content h3 {
    color: var(--text-primary);
    margin-top: 24px;
    margin-bottom: 12px;
}

.markdown-content code {
    background: var(--bg-main);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
}

.markdown-content pre {
    background: #1e293b;
    color: #e2e8f0;
    padding: 16px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: 16px 0;
}

.code-editor {
    margin-bottom: 24px;
}

.editor-header {
    background: #1e293b;
    color: white;
    padding: 12px 16px;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.btn-run {
    background: var(--success);
    color: white;
    border: none;
    padding: 6px 16px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 600;
}

.code-input {
    width: 100%;
    min-height: 200px;
    padding: 16px;
    border: 2px solid var(--border);
    border-top: none;
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    font-family: 'Courier New', monospace;
    font-size: 14px;
    resize: vertical;
}

.code-preview {
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.preview-header {
    background: var(--bg-main);
    padding: 12px 16px;
    font-weight: 600;
    border-bottom: 2px solid var(--border);
}

#previewFrame {
    width: 100%;
    height: 300px;
    border: none;
    background: white;
}

.challenge-box {
    background: var(--bg-main);
    padding: 24px;
    border-radius: var(--radius-sm);
    margin-bottom: 24px;
}

.hint-box {
    margin-top: 16px;
    padding: 16px;
    background: #fef3c7;
    border-left: 4px solid var(--warning);
    border-radius: var(--radius-sm);
}

.btn-hint {
    margin-top: 12px;
    background: var(--secondary);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.feedback-box {
    padding: 16px;
    border-radius: var(--radius-sm);
    margin-top: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.feedback-box.success {
    background: #d1fae5;
    color: var(--success);
}

.feedback-box.error {
    background: #fee;
    color: var(--danger);
}

.feedback-icon {
    font-size: 24px;
}

.btn-submit {
    background: var(--primary);
    color: white;
    border: none;
    padding: 16px 32px;
    border-radius: var(--radius-sm);
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    margin-top: 24px;
}

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

.lesson-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 48px;
}

.btn-nav {
    padding: 12px 24px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 600;
}

.success-modal .success-animation {
    margin-bottom: 24px;
}

.checkmark {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--success);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    margin: 0 auto;
    animation: checkmarkPop 0.5s ease;
}

@keyframes checkmarkPop {
    0% { transform: scale(0); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.reward-display {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin: 24px 0;
}

.reward-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.reward-icon {
    font-size: 32px;
}

.reward-value {
    font-weight: 700;
    color: var(--primary);
}

/* Leaderboard */
.leaderboard-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 32px 20px;
}

.leaderboard-header {
    text-align: center;
    margin-bottom: 48px;
}

.leaderboard-header h1 {
    font-size: 42px;
    margin-bottom: 8px;
}

.btn-share {
    background: var(--secondary);
    color: white;
    border: none;
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 600;
}

.podium {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 24px;
    margin-bottom: 48px;
}

.podium-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.crown {
    font-size: 32px;
    animation: crownFloat 2s ease-in-out infinite;
}

@keyframes crownFloat {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.podium-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
}

.podium-1 .podium-avatar {
    width: 100px;
    height: 100px;
    font-size: 48px;
}

.podium-name {
    font-weight: 700;
}

.podium-points {
    color: var(--text-secondary);
    font-size: 14px;
}

.podium-stand {
    width: 120px;
    background: var(--bg-main);
    border-radius: var(--radius) var(--radius) 0 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.rank-1 {
    height: 150px;
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
}

.rank-2 {
    height: 120px;
    background: linear-gradient(135deg, #9ca3af, #6b7280);
}

.rank-3 {
    height: 100px;
    background: linear-gradient(135deg, #d97706, #b45309);
}

.rank-number {
    font-size: 32px;
    font-weight: 700;
    color: white;
}

.leaderboard-list {
    background: white;
    border-radius: var(--radius);
    padding: 24px;
}

.leaderboard-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    border-bottom: 1px solid var(--border);
    transition: background 0.3s;
}

.leaderboard-item:hover {
    background: var(--bg-main);
}

.leaderboard-rank {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-secondary);
    min-width: 40px;
}

.leaderboard-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.leaderboard-info {
    flex: 1;
}

.leaderboard-username {
    font-weight: 600;
}

.leaderboard-level {
    font-size: 14px;
    color: var(--text-secondary);
}

.leaderboard-points {
    font-weight: 700;
    color: var(--primary);
}

.your-rank {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 24px;
    border-radius: var(--radius);
    margin-top: 24px;
}

.rank-badge {
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 8px;
    opacity: 0.9;
}

.rank-info {
    display: flex;
    align-items: center;
    gap: 16px;
}

.rank-position {
    font-size: 32px;
    font-weight: 700;
}

/* Profile */
.profile-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 20px;
}

.profile-header {
    background: white;
    padding: 48px;
    border-radius: var(--radius);
    display: flex;
    gap: 48px;
    margin-bottom: 32px;
}

.profile-avatar-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.profile-avatar-large {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 64px;
}

.profile-avatar-large img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
}

.btn-upload {
    background: var(--primary);
    color: white;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
}

.profile-info {
    flex: 1;
}

.profile-info h1 {
    font-size: 36px;
    margin-bottom: 8px;
}

.profile-email {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.profile-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.profile-stat {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    background: var(--bg-main);
    border-radius: var(--radius-sm);
}

.stat-icon-large {
    font-size: 40px;
}

.stat-details .stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
}

.profile-content {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.badges-section, .streak-section, .recent-activity {
    background: white;
    padding: 32px;
    border-radius: var(--radius);
}

.badges-section h2, .streak-section h2, .recent-activity h2 {
    margin-bottom: 24px;
}

.badges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 24px;
}

.badge-item-profile {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 24px;
    background: var(--bg-main);
    border-radius: var(--radius);
}

.badge-item-profile .badge-icon {
    font-size: 64px;
    margin-bottom: 12px;
}

.badge-item-profile .badge-name {
    font-weight: 600;
    margin-bottom: 4px;
}

.badge-item-profile .badge-desc {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Badge Card Styles */
.badge-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 24px;
    background: var(--bg-card);
    border-radius: var(--radius);
    transition: all 0.3s ease;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.badge-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--badge-color, var(--primary));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.badge-card:not(.locked)::before {
    opacity: 1;
}

.badge-card:not(.locked):hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--badge-color, var(--primary));
}

.badge-card.locked {
    background: #f1f5f9;
    opacity: 0.6;
}

.badge-icon-large {
    font-size: 64px;
    margin-bottom: 12px;
    transition: transform 0.3s ease;
}

.badge-card:not(.locked):hover .badge-icon-large {
    transform: scale(1.1);
}

.badge-card.locked .badge-icon-large {
    filter: grayscale(100%);
}

.badge-name {
    font-weight: 600;
    font-size: 16px;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.badge-card.locked .badge-name {
    color: var(--text-secondary);
}

.badge-description {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 12px;
    line-height: 1.4;
}

.badge-status {
    margin-top: auto;
    padding-top: 12px;
    width: 100%;
}

.badge-status .unlocked {
    display: inline-block;
    padding: 4px 12px;
    background: var(--success);
    color: white;
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
}

.badge-status .locked-text {
    display: inline-block;
    padding: 4px 12px;
    background: #cbd5e1;
    color: #64748b;
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
}

.streak-calendar {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 8px;
    margin-bottom: 24px;
}

.streak-day {
    aspect-ratio: 1;
    background: var(--bg-main);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.streak-day.active {
    background: var(--warning);
    color: white;
    font-weight: 700;
}

.streak-stats {
    display: flex;
    gap: 32px;
}

.streak-stat-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.streak-stat-item .label {
    font-size: 14px;
    color: var(--text-secondary);
}

.streak-stat-item .value {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
}

.activity-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.activity-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    background: var(--bg-main);
    border-radius: var(--radius-sm);
}

.activity-icon {
    font-size: 32px;
}

.activity-details .activity-title {
    font-weight: 600;
}

.activity-details .activity-date {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Admin */
.admin-container {
    display: grid;
    grid-template-columns: 250px 1fr;
    min-height: calc(100vh - 70px);
}

.admin-sidebar {
    background: white;
    padding: 24px;
    border-right: 1px solid var(--border);
}

.admin-menu {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.admin-menu-item {
    padding: 12px 16px;
    border: none;
    background: transparent;
    text-align: left;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all 0.3s;
}

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

.admin-content {
    padding: 32px;
}

.admin-section {
    display: none;
}

.admin-section.active {
    display: block;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.stat-card-admin {
    background: white;
    padding: 24px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: var(--shadow);
}

.stat-icon-admin {
    font-size: 48px;
}

.stat-value-admin {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
}

.stat-label-admin {
    color: var(--text-secondary);
}

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

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

.admin-table thead {
    background: var(--bg-main);
}

.admin-table th, .admin-table td {
    padding: 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.admin-table th {
    font-weight: 600;
}

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

.table-actions {
    display: flex;
    gap: 8px;
}

.btn-edit, .btn-delete {
    padding: 6px 12px;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 12px;
    font-weight: 600;
}

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

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

.badges-admin-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 24px;
}

.badge-admin-card {
    background: white;
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
}

.modal-large {
    max-width: 800px;
    max-height: 90vh;
    overflow-y: auto;
    text-align: left;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.modal-close {
    background: none;
    border: none;
    font-size: 32px;
    cursor: pointer;
    color: var(--text-secondary);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 24px;
}

/* Responsive */
@media (max-width: 968px) {
    .hero {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-illustration {
        display: none;
    }
    
    .auth-container {
        grid-template-columns: 1fr;
    }
    
    .auth-illustration {
        display: none;
    }
    
    .dashboard-container {
        grid-template-columns: 1fr;
    }
    
    .learn-container {
        grid-template-columns: 1fr;
    }
    
    .lesson-sidebar {
        position: static;
    }
    
    .profile-header {
        flex-direction: column;
        text-align: center;
    }
    
    .profile-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .admin-container {
        grid-template-columns: 1fr;
    }
    
    .admin-sidebar {
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
    
    .admin-menu {
        flex-direction: row;
        overflow-x: auto;
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 36px;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn-large {
        width: 100%;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .materials-grid {
        grid-template-columns: 1fr;
    }
    
    .podium {
        flex-direction: column;
        align-items: center;
    }
    
    .profile-stats {
        grid-template-columns: 1fr;
    }
}