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

:root {
    --primary-blue: #3B82F6;
    --primary-blue-dark: #2563EB;
    --white: #FFFFFF;
    --background-grey: #F3F4F6;
    --light-grey: #E5E7EB;
    --medium-grey: #9CA3AF;
    --dark-grey: #6B7280;
    --text-dark: #1F2937;
    --text-medium: #4B5563;
    --success: #10B981;
    --error: #EF4444;
    --warning: #F59E0B;
    --premium-gold: #D97706;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--light-grey);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-dark);
    text-decoration: none;
}

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

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    color: var(--text-medium);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    transition: color 0.3s ease;
}

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

/* Language Selector */
.language-selector {
    position: relative;
}

.language-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: var(--white);
    border: 1px solid var(--light-grey);
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
    transition: all 0.3s ease;
}

.language-btn:hover {
    border-color: var(--primary-blue);
    color: var(--primary-blue);
}

.language-btn svg {
    transition: transform 0.3s ease;
}

.language-selector.active .language-btn svg {
    transform: rotate(180deg);
}

.language-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--white);
    border: 1px solid var(--light-grey);
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    min-width: 180px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
}

.language-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    text-decoration: none;
    color: var(--text-dark);
    transition: background 0.2s ease;
    border-bottom: 1px solid var(--light-grey);
}

.lang-option:last-child {
    border-bottom: none;
}

.lang-option:hover {
    background: var(--background-grey);
}

.lang-option span:first-child {
    font-size: 20px;
}

.lang-option span:last-child {
    font-weight: 500;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    transition: all 0.3s ease;
}

/* Buttons */
.btn-primary, .btn-primary-small {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-blue-dark));
    color: var(--white);
    padding: 14px 28px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-primary-small {
    padding: 10px 20px;
    font-size: 14px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background: var(--white);
    color: var(--primary-blue);
    padding: 14px 28px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    border: 2px solid var(--primary-blue);
}

.btn-secondary:hover {
    background: var(--primary-blue);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--primary-blue);
    padding: 14px 28px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    border: 2px solid var(--primary-blue);
    width: 100%;
}

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

/* Hero Section */
.hero {
    position: relative;
    padding: 140px 0 100px;
    background: linear-gradient(180deg, #E0F2FE 0%, #F0F9FF 50%, #FFFFFF 100%);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 80%, rgba(37, 99, 235, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    animation: fadeInUp 0.8s ease;
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    color: var(--text-dark);
}

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

.hero-subtitle {
    font-size: 20px;
    color: var(--text-medium);
    margin-bottom: 40px;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

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

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

.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-medium);
    font-weight: 500;
}

/* Phone Mockup */
.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeInRight 0.8s ease;
}

.phone-mockup {
    width: 300px;
    height: 600px;
    background: var(--text-dark);
    border-radius: 40px;
    padding: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    position: relative;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--white);
    border-radius: 32px;
    overflow: hidden;
    position: relative;
}

.mockup-content {
    padding: 20px;
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.mockup-header {
    height: 40px;
    background: var(--background-grey);
    border-radius: 8px;
}

.mockup-book-cover {
    flex: 1;
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-blue-dark));
    border-radius: 16px;
    position: relative;
    overflow: hidden;
}

.mockup-book-cover::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    bottom: 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
}

.mockup-controls {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.mockup-progress {
    height: 4px;
    background: var(--light-grey);
    border-radius: 2px;
    position: relative;
    overflow: hidden;
}

.mockup-progress::after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 60%;
    height: 100%;
    background: var(--primary-blue);
    border-radius: 2px;
}

.mockup-buttons {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 24px;
}

.mockup-btn {
    width: 48px;
    height: 48px;
    background: var(--background-grey);
    border-radius: 50%;
}

.mockup-btn-large {
    width: 72px;
    height: 72px;
    background: var(--primary-blue);
    border-radius: 50%;
}

/* Section Styles */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-title {
    font-size: 42px;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-medium);
    max-width: 600px;
    margin: 0 auto;
}

/* Features Section */
.features {
    background: var(--white);
}

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

.feature-card {
    background: var(--white);
    padding: 32px;
    border-radius: 16px;
    border: 1px solid var(--light-grey);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
    border-color: var(--primary-blue);
}

.feature-icon {
    margin-bottom: 24px;
}

.feature-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.feature-description {
    font-size: 16px;
    color: var(--text-medium);
    line-height: 1.6;
}

/* How It Works Section */
.how-it-works {
    background: var(--background-grey);
}

.steps {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 32px;
    flex-wrap: wrap;
}

.step {
    flex: 1;
    min-width: 250px;
    max-width: 300px;
    text-align: center;
}

.step-number {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-blue-dark));
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: 700;
    margin: 0 auto 24px;
    box-shadow: 0 8px 16px rgba(59, 130, 246, 0.3);
}

.step-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.step-description {
    font-size: 16px;
    color: var(--text-medium);
    line-height: 1.6;
}

.step-arrow {
    display: flex;
    align-items: center;
    color: var(--primary-blue);
}

/* Pricing Section */
.pricing {
    background: var(--white);
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
    max-width: 900px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--white);
    padding: 40px;
    border-radius: 20px;
    border: 2px solid var(--light-grey);
    transition: all 0.3s ease;
    position: relative;
}

.pricing-card.featured {
    border-color: var(--primary-blue);
    box-shadow: 0 12px 32px rgba(59, 130, 246, 0.15);
    transform: scale(1.05);
}

.pricing-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--background-grey);
    color: var(--text-dark);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 16px;
}

.pricing-badge.premium {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-blue-dark));
    color: var(--white);
}

.pricing-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.pricing-price {
    display: flex;
    align-items: baseline;
    gap: 8px;
    margin-bottom: 8px;
}

.price-amount {
    font-size: 48px;
    font-weight: 800;
    color: var(--primary-blue);
}

.price-period {
    font-size: 18px;
    color: var(--text-medium);
}

.pricing-alternative {
    font-size: 14px;
    color: var(--text-medium);
    margin-bottom: 32px;
}

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

.pricing-features li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
    font-size: 16px;
    color: var(--text-medium);
}

.pricing-features li.feature-limited {
    color: var(--warning);
}

.pricing-features li svg {
    flex-shrink: 0;
    margin-top: 2px;
}

/* Testimonials Section */
.testimonials {
    background: var(--background-grey);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.testimonial-card {
    background: var(--white);
    padding: 32px;
    border-radius: 16px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.testimonial-rating {
    display: flex;
    gap: 4px;
    margin-bottom: 20px;
}

.testimonial-text {
    font-size: 16px;
    color: var(--text-medium);
    line-height: 1.7;
    margin-bottom: 24px;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 16px;
}

.author-avatar {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-blue-dark));
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 16px;
}

.author-name {
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 4px;
}

.author-role {
    font-size: 14px;
    color: var(--text-medium);
}

/* CTA Section */
.cta {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-blue-dark));
    color: var(--white);
    text-align: center;
}

.cta-title {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 16px;
    color: var(--white);
}

.cta-subtitle {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.95;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.btn-app-store, .btn-google-play {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: 12px 24px;
    border-radius: 12px;
    text-decoration: none;
    color: var(--white);
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-app-store:hover, .btn-google-play:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

.btn-app-label {
    font-size: 12px;
    opacity: 0.9;
}

.btn-app-name {
    font-size: 18px;
    font-weight: 600;
}

/* Footer */
.footer {
    background: var(--text-dark);
    color: var(--white);
    padding: 60px 0 24px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-description {
    color: var(--medium-grey);
    margin-top: 16px;
    line-height: 1.6;
}

.footer-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--white);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--medium-grey);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--white);
}

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    color: var(--medium-grey);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Responsive Design */
@media (max-width: 968px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-image {
        order: -1;
    }

    .hero-title {
        font-size: 42px;
    }

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

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

    .steps {
        flex-direction: column;
    }

    .step-arrow {
        transform: rotate(90deg);
    }

    .pricing-card.featured {
        transform: scale(1);
    }

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .language-selector {
        order: -1;
    }

    .mobile-menu-toggle {
        display: flex;
    }
    
    .language-dropdown {
        right: auto;
        left: 0;
    }

    .hero {
        padding: 120px 0 60px;
    }

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

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

    .section-title {
        font-size: 32px;
    }

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

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

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

    .phone-mockup {
        width: 240px;
        height: 480px;
    }
}

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
    }

    .btn-primary, .btn-secondary {
        width: 100%;
        justify-content: center;
    }

    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }

    .cta-buttons {
        flex-direction: column;
    }

    .btn-app-store, .btn-google-play {
        width: 100%;
        justify-content: center;
    }
}