/* Root Variables - Clean Blue & White Theme */
:root {
    --primary-blue: #2563eb;
    --primary-blue-dark: #1d4ed8;
    --primary-blue-light: #3b82f6;
    --secondary-blue: #0ea5e9;
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-grey: #f1f5f9;
    --text-dark: #1e293b;
    --text-medium: #475569;
    --text-light: #64748b;
    --border-light: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
    min-height: 100vh;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-dark);
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 1rem 2rem;
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-blue);
}

.logo-img {
    height: 32px;
    width: auto;
}

.nav-links {
    display: flex;
    gap: 1rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-medium);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.nav-links a:hover {
    color: var(--primary-blue);
    background: var(--bg-grey);
}

/* Hero Section */
.hero {
    min-height: 70vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 7rem 2rem 4rem;
    background: linear-gradient(180deg, #eef2ff 0%, var(--bg-white) 100%);
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue), var(--secondary-blue), var(--primary-blue));
}

.hero-badge {
    background: var(--primary-blue);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.hero h1 {
    font-size: clamp(2.2rem, 5vw, 3rem);
    margin-bottom: 1rem;
    color: var(--text-dark);
    max-width: 700px;
}

.hero p {
    font-size: 1.1rem;
    color: var(--text-medium);
    max-width: 550px;
    margin-bottom: 2rem;
    line-height: 1.7;
}

.hero .btn {
    width: auto;
    padding: 0.875rem 2.5rem;
}

/* Courses Section */
.courses {
    padding: 4rem 2rem;
    max-width: 1100px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: 2.25rem;
    margin-bottom: 3rem;
    color: var(--text-dark);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    justify-content: center;
}

/* Course Card */
.course-card {
    background: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    position: relative;
}

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

.course-icon {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    background: var(--bg-grey);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.course-card h3 {
    font-size: 1.4rem;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.course-card p {
    color: var(--text-medium);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.course-features {
    list-style: none;
    margin-bottom: 1.5rem;
}

.course-features li {
    padding: 0.4rem 0;
    color: var(--text-medium);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.95rem;
}

.course-features li::before {
    content: '✓';
    color: var(--primary-blue);
    font-weight: bold;
}

.price {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-blue);
    margin-bottom: 1.5rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    border-radius: 10px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
    width: 100%;
    text-align: center;
}

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

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

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

.btn-secondary:hover {
    background: #0284c7;
}

/* Modal */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    justify-content: center;
    align-items: center;
}

.modal-overlay.active {
    display: flex;
    animation: fadeIn 0.3s ease;
}

.modal {
    background: var(--bg-white);
    border-radius: 16px;
    padding: 2.5rem;
    max-width: 420px;
    text-align: center;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease;
}

.modal-icon {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.modal h2 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.modal p {
    color: var(--text-medium);
    margin-bottom: 1.5rem;
}

.modal .btn {
    width: auto;
    padding: 0.75rem 2rem;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Footer */
.footer {
    background: var(--bg-white);
    border-top: 1px solid var(--border-light);
    padding: 3rem 2rem;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.footer-section h4 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--primary-blue);
}

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

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

.footer-section a {
    color: var(--text-medium);
    transition: color 0.3s ease;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    margin-top: 2rem;
    border-top: 1px solid var(--border-light);
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Page Styles */
.page-header {
    padding: 8rem 2rem 3rem;
    text-align: center;
    background: var(--bg-white);
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
    color: var(--primary-blue);
}

.page-content {
    max-width: 750px;
    margin: 0 auto;
    padding: 2rem;
    background: var(--bg-white);
}

.page-content h2 {
    font-size: 1.35rem;
    margin: 2rem 0 0.75rem;
    color: var(--text-dark);
}

.page-content p,
.page-content li {
    color: var(--text-medium);
    margin-bottom: 0.75rem;
    line-height: 1.7;
}

.page-content ul {
    padding-left: 1.5rem;
}

.contact-form {
    background: var(--bg-grey);
    border: 1px solid var(--border-light);
    border-radius: 16px;
    padding: 2rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem;
    border-radius: 10px;
    border: 1px solid var(--border-light);
    background: var(--bg-white);
    color: var(--text-dark);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s ease;
}

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

.form-group textarea {
    min-height: 130px;
    resize: vertical;
}

/* Features Section */
.features {
    padding: 4rem 2rem;
    background: var(--bg-white);
}

.features-container {
    max-width: 1100px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    text-align: center;
    padding: 2rem 1.5rem;
    border-radius: 12px;
    background: var(--bg-light);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--text-medium);
    line-height: 1.6;
}

/* Benefits Section */
.benefits {
    padding: 4rem 2rem;
    background: var(--bg-light);
}

.benefits-container {
    max-width: 800px;
    margin: 0 auto;
}

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

.benefit-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    background: var(--bg-white);
    border-radius: 10px;
    font-size: 1rem;
    color: var(--text-dark);
}

.benefit-check {
    color: var(--primary-blue);
    font-weight: bold;
    font-size: 1.2rem;
}

/* CTA Section */
.cta {
    padding: 3.5rem 2rem;
    text-align: center;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-dark) 100%);
    color: white;
    max-width: 900px;
    margin: 0 auto 3rem;
    border-radius: 16px;
}

.cta h2 {
    color: white;
    font-size: 1.75rem;
    margin-bottom: 0.75rem;
}

.cta p {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

.cta .btn-primary {
    background: white;
    color: var(--primary-blue);
    width: auto;
    padding: 0.75rem 2rem;
    display: inline-block;
}

.cta .btn-primary:hover {
    background: var(--bg-light);
}

/* Outline Button */
.btn-outline {
    background: transparent;
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

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

/* Course Detail Page */
.course-detail {
    background: var(--bg-white);
    padding-bottom: 3rem;
}

.course-price-box {
    background: var(--bg-grey);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    margin-bottom: 2rem;
}

.course-price-label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-medium);
    margin-bottom: 0.25rem;
}

.course-price-value {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-blue);
    margin-bottom: 1rem;
}

.course-price-box .btn {
    width: auto;
    padding: 0.75rem 2rem;
}

/* Disclaimer */
.disclaimer {
    font-size: 0.8rem;
    color: var(--text-light);
    margin-top: 0.75rem;
    font-style: italic;
}

.disclaimer-box {
    background: #fef3c7;
    border: 1px solid #f59e0b;
    border-radius: 8px;
    padding: 1rem;
    margin: 1.5rem 0;
    font-size: 0.9rem;
    color: #92400e;
    line-height: 1.6;
}

/* About Page */
.about-page {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
}

.about-section {
    margin-bottom: 3rem;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.about-card {
    background: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow-sm);
}

.about-card.highlight-card {
    background: linear-gradient(135deg, #eef2ff 0%, var(--bg-white) 100%);
    border: 2px solid var(--primary-blue);
    text-align: center;
}

.about-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.about-card h2,
.about-card h3 {
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.about-card p {
    color: var(--text-medium);
    line-height: 1.7;
}

.section-title-left {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

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

.value-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: 12px;
}

.value-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.value-item h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
    color: var(--text-dark);
}

.value-item p {
    font-size: 0.9rem;
    color: var(--text-medium);
    margin: 0;
}

/* Contact Page */
.contact-page {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
}

.contact-grid {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 2rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-card {
    background: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.contact-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

.contact-card h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.contact-card p {
    font-size: 0.9rem;
    color: var(--text-medium);
    margin: 0;
}

.contact-form-container {
    background: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow-sm);
}

.contact-form-container h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.contact-form-container .contact-form {
    background: transparent;
    border: none;
    padding: 0;
}

/* Mobile responsive */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.5rem;
    }

    .nav-links a {
        padding: 0.5rem 0.75rem;
        font-size: 0.9rem;
    }

    .hero {
        padding: 9rem 1rem 3rem;
    }

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

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

    .contact-info {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .contact-card {
        flex: 1;
        min-width: 140px;
    }

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

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