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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.btn-primary {
    background: #EA580C;
    color: white;
}

.btn-primary:hover {
    background: #DC2626;
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: #1E40AF;
    border: 2px solid #1E40AF;
}

.btn-outline:hover {
    background: #1E40AF;
    color: white;
}

.btn-outline-white {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-outline-white:hover {
    background: white;
    color: #1E40AF;
}

.btn-success {
    background: #059669;
    color: white;
}

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

.btn-cta {
    background: #EA580C;
    color: white;
    font-size: 18px;
    padding: 16px 32px;
}

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

.btn-full {
    width: 100%;
}

.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

/* Header */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #e5e7eb;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
}

.logo-text {
    font-size: 24px;
    font-weight: 800;
    background: linear-gradient(135deg, #1E40AF, #059669);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-desktop {
    display: flex;
    gap: 32px;
}

.nav-link {
    color: #374151;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #1E40AF;
}

.header-buttons {
    display: flex;
    gap: 16px;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
}

.mobile-menu {
    display: none;
    background: white;
    border-top: 1px solid #e5e7eb;
    padding: 20px 0;
}

.mobile-nav {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.mobile-nav-link {
    color: #374151;
    text-decoration: none;
    font-weight: 500;
    padding: 8px 0;
}

.mobile-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 16px;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #1E40AF 0%, #059669 100%);
    color: white;
    padding: 120px 0 80px;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 24px;
}

.hero-title {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 24px;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 20px;
    margin-bottom: 32px;
    opacity: 0.9;
}

.hero-features {
    margin-bottom: 32px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    font-size: 18px;
}

.feature-item i {
    color: #10B981;
    font-size: 20px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.social-proof {
    display: flex;
    align-items: center;
    gap: 12px;
    opacity: 0.8;
}

.stars {
    display: flex;
    gap: 4px;
}

.stars i {
    color: #FCD34D;
}

.hero-image {
    position: relative;
}

.main-image {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.certificate-badge {
    position: absolute;
    bottom: -24px;
    left: -24px;
    background: white;
    padding: 16px;
    border-radius: 12px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    gap: 12px;
}

.cert-icon {
    width: 48px;
    height: 48px;
    border-radius: 8px;
}

.cert-title {
    font-weight: 600;
    color: #111827;
    margin-bottom: 4px;
}

.cert-subtitle {
    font-size: 14px;
    color: #6B7280;
}

/* Problems & Solutions */
.problems-solutions {
    padding: 80px 0;
    background: #F9FAFB;
}

.problems-solutions-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.section-title {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 32px;
    line-height: 1.2;
}

.solution-title {
    color: #059669;
}

.problem-list, .solution-list {
    margin-bottom: 32px;
}

.problem-item, .solution-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
    font-size: 18px;
}

.problem-item i {
    color: #EF4444;
    font-size: 20px;
    margin-top: 2px;
}

.solution-item i {
    color: #10B981;
    font-size: 20px;
    margin-top: 2px;
}

/* Benefits */
.benefits {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-subtitle {
    font-size: 20px;
    color: #6B7280;
    margin-top: 16px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.benefit-card {
    background: white;
    padding: 32px;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: all 0.3s ease;
}

.benefit-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.benefit-icon {
    width: 80px;
    height: 80px;
    background: #F3F4F6;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
}

.benefit-icon i {
    font-size: 32px;
    color: #1E40AF;
}

.benefit-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.benefit-description {
    color: #6B7280;
    font-size: 16px;
}

/* Professor */
.professor {
    padding: 80px 0;
    background: #F9FAFB;
}

.professor-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.prof-img {
    width: 100%;
    max-width: 400px;
    border-radius: 12px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
}

.professor-name {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 8px;
}

.professor-title {
    font-size: 20px;
    color: #1E40AF;
    font-weight: 600;
    margin-bottom: 32px;
}

.professor-credentials {
    margin-bottom: 32px;
}

.credential-item {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    font-size: 18px;
}

.credential-item i {
    color: #10B981;
    font-size: 20px;
}

.professor-quote {
    font-size: 18px;
    font-style: italic;
    color: #374151;
    border-left: 4px solid #1E40AF;
    padding-left: 24px;
}

/* Course Content */
.course-content {
    padding: 80px 0;
}

.chapters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
    margin-bottom: 60px;
}

.chapter-card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    transition: all 0.3s ease;
}

.chapter-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.chapter-header {
    padding: 24px;
    text-align: center;
    border-bottom: 1px solid #E5E7EB;
}

.chapter-title {
    font-size: 24px;
    color: #1E40AF;
    margin-bottom: 8px;
}

.chapter-subtitle {
    color: #6B7280;
    font-size: 16px;
}

.chapter-content {
    padding: 24px;
}

.lesson-list {
    list-style: none;
    margin-bottom: 24px;
}

.lesson-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 12px;
    font-size: 14px;
}

.lesson-item i {
    color: #10B981;
    font-size: 16px;
    margin-top: 2px;
}

.lesson-more {
    font-size: 14px;
    color: #6B7280;
    font-style: italic;
    margin-top: 8px;
}

.section-cta {
    text-align: center;
}

/* Pricing */
.pricing {
    padding: 80px 0;
    background: #F9FAFB;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
    max-width: 800px;
    margin: 0 auto 40px;
}

.pricing-card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    position: relative;
    transition: all 0.3s ease;
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.pricing-card.featured {
    border: 2px solid #1E40AF;
}

.popular-badge {
    position: absolute;
    top: -16px;
    left: 50%;
    transform: translateX(-50%);
    background: #1E40AF;
    color: white;
    padding: 8px 24px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
}

.pricing-header {
    padding: 32px 24px 24px;
    text-align: center;
}

.plan-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 16px;
}

.plan-price {
    font-size: 48px;
    font-weight: 800;
    color: #1E40AF;
    margin-bottom: 16px;
}

.plan-price.premium {
    color: #059669;
}

.plan-description {
    color: #6B7280;
    font-size: 18px;
}

.pricing-content {
    padding: 0 24px 32px;
}

.feature-list {
    list-style: none;
    margin-bottom: 32px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.feature-item i {
    color: #10B981;
    font-size: 18px;
}

.security-badges {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-top: 40px;
    color: #6B7280;
}

.security-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* FAQ */
.faq {
    padding: 80px 0;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    margin-bottom: 24px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
}

.faq-question {
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.faq-question h3 {
    font-size: 18px;
    font-weight: 600;
}

.faq-icon {
    font-size: 20px;
}

.faq-answer {
    padding: 0 24px 24px;
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.answer-icon {
    font-size: 18px;
    margin-top: 2px;
}

.faq-answer p {
    color: #374151;
    line-height: 1.6;
}

/* Footer */
.footer {
    background: #111827;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-title {
    font-size: 24px;
    font-weight: 800;
    background: linear-gradient(135deg, #1E40AF, #059669);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
}

.footer-description {
    color: #D1D5DB;
    line-height: 1.6;
}

.footer-subtitle {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
}

.contact-info, .footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.contact-item, .footer-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #D1D5DB;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-link:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: 20px;
    text-align: center;
    color: #9CA3AF;
}

/* Floating CTA */
.floating-cta {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
    z-index: 1000;
}

.floating-btn {
    padding: 12px 20px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
}

.floating-btn.whatsapp {
    background: #25D366;
    color: white;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.floating-btn.buy {
    background: #EA580C;
    color: white;
}

.floating-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-desktop, .header-buttons {
        display: none;
    }

    .mobile-menu-btn {
        display: block;
    }

    .mobile-menu.active {
        display: block;
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .hero-buttons {
        justify-content: center;
    }

    .problems-solutions-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .professor-content {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

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

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

    .security-badges {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .floating-cta {
        display: flex;
    }
}

@media (min-width: 769px) {
    .floating-cta {
        display: none;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}