:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #10b981;
    --accent: #f59e0b;
    --dark: #1f2937;
    --text: #374151;
    --light: #f9fafb;
    --border: #e5e7eb;
    --success: #22c55e;
    --error: #ef4444;
}

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

body {
    font-family: 'Inter', sans-serif;
    color: var(--text);
    line-height: 1.6;
    background: var(--light);
}

/* Navigation */
nav {
    background: white;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: 'Poppins', sans-serif;
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-links a {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

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

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    display: inline-block;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

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

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 5rem 2rem;
    text-align: center;
}

.hero h1 {
    font-family: 'Poppins', sans-serif;
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.95;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Stats Section */
.stats {
    max-width: 1200px;
    margin: -3rem auto 0;
    padding: 0 2rem;
    position: relative;
    z-index: 10;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    background: white;
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
}

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

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary);
    font-family: 'Poppins', sans-serif;
}

.stat-label {
    color: var(--text);
    font-weight: 500;
}

/* Courses Section */
.section {
    padding: 5rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-family: 'Poppins', sans-serif;
    font-size: 2.5rem;
    color: var(--dark);
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
}

.course-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    transition: all 0.3s;
    cursor: pointer;
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(0,0,0,0.15);
}

.course-thumbnail {
    height: 200px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    position: relative;
}

.course-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--accent);
    color: white;
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.live-badge {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: var(--error);
    color: white;
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.course-content {
    padding: 1.5rem;
}

.course-category {
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.course-title {
    font-family: 'Poppins', sans-serif;
    font-size: 1.4rem;
    font-weight: 700;
    margin: 0.5rem 0;
    color: var(--dark);
}

.course-instructor {
    color: var(--text);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.course-meta {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    color: #6b7280;
}

.course-meta span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.course-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.course-price {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary);
    font-family: 'Poppins', sans-serif;
}

.course-price span {
    font-size: 1rem;
    color: #9ca3af;
    text-decoration: line-through;
    margin-left: 0.5rem;
}

.enroll-btn {
    background: var(--primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.enroll-btn:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

/* Features */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-family: 'Poppins', sans-serif;
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--dark);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 16px;
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    animation: modalSlideIn 0.3s ease-out;
}

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

.modal-header {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 2rem;
    border-radius: 16px 16px 0 0;
}

.modal-header h2 {
    font-family: 'Poppins', sans-serif;
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

.close-modal {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(255,255,255,0.2);
    border: none;
    color: white;
    font-size: 1.5rem;
    width: 35px;
    height: 35px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

.close-modal:hover {
    background: rgba(255,255,255,0.3);
    transform: rotate(90deg);
}

.modal-body {
    padding: 2rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.9rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    transition: all 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

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

/* Payment Section */
.payment-section {
    background: var(--light);
    padding: 1.5rem;
    border-radius: 12px;
    margin-top: 1.5rem;
}

.payment-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.payment-method {
    padding: 1rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background: white;
}

.payment-method:hover {
    border-color: var(--primary);
}

.payment-method.active {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
}

.payment-method-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.payment-method-name {
    font-weight: 600;
    font-size: 0.9rem;
}

.upi-section {
    display: none;
    padding: 1.5rem;
    background: white;
    border-radius: 8px;
    border: 2px solid var(--primary);
}

.upi-section.active {
    display: block;
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.upi-apps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.upi-app {
    padding: 1rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background: white;
}

.upi-app:hover,
.upi-app.active {
    border-color: var(--success);
    background: rgba(34, 197, 94, 0.05);
}

.upi-app-icon {
    font-size: 2.5rem;
    margin-bottom: 0.3rem;
}

.upi-app-name {
    font-size: 0.85rem;
    font-weight: 600;
}

.qr-code-container {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    border: 2px dashed var(--primary);
    margin: 1rem 0;
}

.qr-code {
    width: 250px;
    height: 250px;
    margin: 0 auto 1rem;
    background: linear-gradient(45deg, #f0f0f0 25%, transparent 25%, transparent 75%, #f0f0f0 75%, #f0f0f0),
                linear-gradient(45deg, #f0f0f0 25%, transparent 25%, transparent 75%, #f0f0f0 75%, #f0f0f0);
    background-size: 20px 20px;
    background-position: 0 0, 10px 10px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
}

.upi-id {
    background: var(--light);
    padding: 1rem;
    border-radius: 8px;
    margin: 1rem 0;
    font-family: 'Courier New', monospace;
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--primary);
}

.copy-btn {
    background: var(--success);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    margin-left: 0.5rem;
    transition: all 0.3s;
}

.copy-btn:hover {
    background: #16a34a;
}

.order-summary {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    margin-bottom: 1.5rem;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.75rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.summary-row:last-child {
    border-bottom: none;
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--primary);
    margin-top: 0.5rem;
}

.submit-payment-btn {
    width: 100%;
    background: var(--success);
    color: white;
    padding: 1.2rem;
    border: none;
    border-radius: 8px;
    font-weight: 700;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s;
}

.submit-payment-btn:hover {
    background: #16a34a;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(34, 197, 94, 0.3);
}

/* Success Message */
.success-message {
    display: none;
    text-align: center;
    padding: 2rem;
}

.success-message.active {
    display: block;
    animation: fadeIn 0.5s ease-out;
}

.success-icon {
    font-size: 5rem;
    margin-bottom: 1rem;
}

.success-message h3 {
    font-family: 'Poppins', sans-serif;
    font-size: 2rem;
    color: var(--success);
    margin-bottom: 1rem;
}

/* Footer */
footer {
    background: var(--dark);
    color: white;
    padding: 3rem 2rem 1rem;
    margin-top: 5rem;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    font-family: 'Poppins', sans-serif;
    margin-bottom: 1rem;
    color: var(--secondary);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    opacity: 0.8;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .nav-links {
        display: none;
    }

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

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

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

    .payment-methods {
        grid-template-columns: 1fr;
    }

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