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

:root {
    --primary-color: #12C2E8;
    --secondary-color: #0891B2;
    --dark-bg: #000000;
    --dark-section: #0a0a0a;
    --card-bg: #1a1a1a;
    --white: #FFFFFF;
    --text-light: #e5e5e5;
    --text-gray: #a0a0a0;
    --gradient: linear-gradient(135deg, #12C2E8 0%, #0891B2 100%);
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.5);
}

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

html {
    scroll-behavior: smooth;
}

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 1000;
    padding: 15px 0;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 800;
    color: var(--white);
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 30px;
}

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

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--white);
    margin: 3px 0;
    transition: 0.3s;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--card-bg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: 20px;
    z-index: 999;
}

.mobile-menu.active {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.mobile-link {
    text-decoration: none;
    color: var(--text-light);
    font-weight: 500;
    padding: 10px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 28px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

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

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

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

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

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

.btn-app {
    background: var(--white);
    color: var(--dark-bg);
    padding: 16px 32px;
    font-size: 16px;
}

.btn-app:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(255, 255, 255, 0.2);
}

.btn-ios-light, .btn-android-light {
    background: var(--white);
    color: var(--dark-bg);
}

/* Hero Section */
.hero {
    margin-top: 70px;
    padding: 100px 0;
    background: var(--dark-bg);
    color: var(--white);
    position: relative;
    overflow: hidden;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(18, 194, 232, 0.15), 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-out;
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-gray);
    margin-bottom: 30px;
    line-height: 1.6;
}

.hero-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 40px;
}

.hero-feature {
    font-size: 16px;
    color: var(--text-light);
}

.hero-cta {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.hero-trial {
    font-size: 16px;
    color: var(--text-gray);
}

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

.phone-mockup {
    position: relative;
}

.phone-frame {
    width: 300px;
    height: 600px;
    background: #1a1a1a;
    border-radius: 40px;
    padding: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
    border: 3px solid #333;
    overflow: hidden;
}

.phone-screenshot {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 30px;
}

/* Stats Section */
.stats {
    padding: 60px 0;
    background: var(--dark-section);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.stat-card {
    text-align: center;
    padding: 30px 20px;
    background: var(--card-bg);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.stat-number {
    font-size: 48px;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.stat-label {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-light);
}

/* Section Title */
.section-title {
    text-align: center;
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 50px;
    color: var(--white);
}

/* Features Section */
.features {
    padding: 80px 0;
    background: var(--dark-bg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    background: var(--card-bg);
    padding: 40px 30px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.3s;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 30px rgba(18, 194, 232, 0.2);
}

.feature-icon {
    font-size: 50px;
    margin-bottom: 20px;
}

.feature-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--white);
}

.feature-card p {
    color: var(--text-gray);
    line-height: 1.6;
}

/* Subjects Section */
.subjects {
    padding: 80px 0;
    background: var(--dark-section);
}

.subjects-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}

.subject-card {
    background: var(--card-bg);
    padding: 30px 20px;
    border-radius: 15px;
    text-align: center;
    transition: transform 0.3s;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.subject-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.subject-icon {
    font-size: 50px;
    margin-bottom: 15px;
}

.subject-card h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--white);
}

/* Pricing Section */
.pricing {
    padding: 80px 0;
    background: var(--dark-bg);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 40px;
}

.pricing-card {
    background: var(--card-bg);
    padding: 40px 30px;
    border-radius: 20px;
    text-align: center;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: transform 0.3s;
}

.pricing-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.pricing-popular {
    border: 2px solid var(--primary-color);
    transform: scale(1.05);
}

.pricing-popular:hover {
    transform: scale(1.05) translateY(-5px);
}

.pricing-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient);
    color: var(--white);
    padding: 8px 20px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 12px;
}

.pricing-tier {
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 15px;
    margin-top: 10px;
    color: var(--white);
}

.pricing-price {
    font-size: 48px;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.pricing-period {
    color: var(--text-gray);
    margin-bottom: 30px;
    font-size: 14px;
}

.pricing-features {
    list-style: none;
    padding: 0;
    margin-bottom: 30px;
    text-align: left;
}

.pricing-features li {
    padding: 12px 0;
    font-size: 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-light);
}

.pricing-trial {
    background: rgba(18, 194, 232, 0.1);
    color: var(--primary-color);
    padding: 10px;
    border-radius: 8px;
    font-weight: 600;
    margin-bottom: 20px;
    font-size: 14px;
}

/* FAQ Section */
.faq {
    padding: 80px 0;
    background: var(--dark-section);
}

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

.faq-item {
    background: var(--card-bg);
    margin-bottom: 15px;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 25px 30px;
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    color: var(--white);
    transition: background 0.3s;
}

.faq-question:hover {
    background: rgba(255, 255, 255, 0.02);
}

.faq-icon {
    font-size: 28px;
    color: var(--primary-color);
    font-weight: bold;
    transition: transform 0.3s;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s ease-out;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 30px 25px;
}

.faq-answer p {
    color: var(--text-gray);
    line-height: 1.8;
    font-size: 15px;
}

/* Final CTA Section */
.final-cta {
    padding: 100px 0;
    background: var(--dark-bg);
    text-align: center;
}

.cta-title {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 20px;
    color: var(--white);
}

.cta-subtitle {
    font-size: 24px;
    margin-bottom: 40px;
    color: var(--text-gray);
}

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

/* Footer */
.footer {
    background: var(--card-bg);
    color: var(--text-gray);
    padding: 40px 0 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 30px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-tagline {
    font-size: 14px;
    color: var(--text-gray);
}

.footer-links {
    display: flex;
    gap: 30px;
}

.footer-links a {
    color: var(--text-gray);
    text-decoration: none;
    transition: color 0.3s;
    font-size: 14px;
}

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

.footer-bottom {
    text-align: center;
}

.footer-bottom p {
    font-size: 14px;
    color: var(--text-gray);
}

/* 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: 1024px) {
    .hero-title {
        font-size: 42px;
    }

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

    .subjects-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

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

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

    .hero {
        min-height: auto;
        padding: 60px 0;
    }

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

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

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

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

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .hero-image {
        order: -1;
    }

    .phone-frame {
        width: 250px;
        height: 500px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

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

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

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

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

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

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

    .cta-subtitle {
        font-size: 20px;
    }

    .footer-content {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }

    .footer-links {
        flex-direction: column;
        gap: 15px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }

    .btn-app {
        width: 100%;
    }
}