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

:root {
    --primary: #1B2632;
    --primary-light: #2d3e4e;
    --accent: #6366f1;
    --accent-light: #818cf8;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
}

html {
    scroll-behavior: smooth;
}

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

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
}

.header.scrolled {
    border-bottom-color: var(--border);
    box-shadow: var(--shadow);
}

.nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: 10px;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.95rem;
    transition: color 0.2s;
}

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

.nav-cta {
    background: var(--accent-gradient);
    color: white !important;
    padding: 0.6rem 1.25rem;
    border-radius: var(--radius);
    transition: transform 0.2s, box-shadow 0.2s !important;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

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

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    padding: 8rem 2rem 4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4rem;
    max-width: 1200px;
    margin: 0 auto;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--primary);
}

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    border-radius: var(--radius);
    font-weight: 700;
    font-size: 1rem;
    text-decoration: none;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

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

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

.btn-large {
    padding: 1.25rem 2.5rem;
    font-size: 1.1rem;
}

.apple-icon {
    width: 24px;
    height: 24px;
}

.hero-stats {
    display: flex;
    gap: 3rem;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-screenshot {
    position: relative;
}

.hero-phone-img {
    width: 280px;
    height: auto;
    border-radius: 32px;
    box-shadow: var(--shadow-xl);
    transform: perspective(1000px) rotateY(-5deg) rotateX(5deg);
    transition: transform 0.5s ease;
}

.hero-phone-img:hover {
    transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
}

/* Screenshots Gallery Section */
.screenshots-section {
    padding: 6rem 2rem;
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    overflow: hidden;
}

.screenshots-carousel {
    position: relative;
    width: 100%;
    overflow: hidden;
    margin-top: 2rem;
}

.screenshots-track {
    display: flex;
    gap: 1.5rem;
    animation: scroll 30s linear infinite;
    width: max-content;
}

.screenshots-track:hover {
    animation-play-state: paused;
}

.screenshot-item {
    flex-shrink: 0;
}

.screenshot-item img {
    width: 220px;
    height: auto;
    border-radius: 24px;
    box-shadow: var(--shadow-lg);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.screenshot-item img:hover {
    transform: scale(1.05) translateY(-10px);
    box-shadow: var(--shadow-xl);
}

@keyframes scroll {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(calc(-220px * 7 - 1.5rem * 7));
    }
}

/* Features Section */
.features {
    padding: 6rem 2rem;
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 4rem;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
}

.feature-icon svg {
    width: 28px;
    height: 28px;
}

.icon-blue {
    background: #dbeafe;
    color: #2563eb;
}

.icon-green {
    background: #dcfce7;
    color: #16a34a;
}

.icon-purple {
    background: #f3e8ff;
    color: #7c3aed;
}

.icon-orange {
    background: #ffedd5;
    color: #ea580c;
}

.icon-pink {
    background: #fce7f3;
    color: #db2777;
}

.icon-teal {
    background: #ccfbf1;
    color: #0d9488;
}

.icon-yellow {
    background: #fef3c7;
    color: #d97706;
}

.icon-red {
    background: #fee2e2;
    color: #dc2626;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.75rem;
}

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

/* How it works */
.how-it-works {
    padding: 6rem 2rem;
    background: white;
}

.steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
    flex-wrap: wrap;
}

.step {
    text-align: center;
    max-width: 250px;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--accent-gradient);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    margin: 0 auto 1rem;
}

.step h3 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.step p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.step-arrow {
    font-size: 2rem;
    color: var(--accent);
    font-weight: 300;
}

/* Levels Section */
.levels {
    padding: 6rem 2rem;
    background: var(--bg-secondary);
}

.levels-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.level-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.level-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.level-emoji {
    font-size: 3rem;
    display: block;
    margin-bottom: 1rem;
}

.level-card h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.25rem;
}

.level-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* FAQ Section */
.faq {
    padding: 6rem 2rem;
    background: white;
}

.faq-list {
    max-width: 700px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border);
}

.faq-item summary {
    padding: 1.5rem 0;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--primary);
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--accent);
    transition: transform 0.3s;
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-item p {
    padding: 0 0 1.5rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* CTA Section */
.cta-section {
    padding: 6rem 2rem;
    background: var(--primary);
    text-align: center;
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 800;
    color: white;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.cta-content p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

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

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

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

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    color: var(--primary);
}

.footer-logo {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

.footer-links {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

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

.footer-copyright {
    color: var(--text-light);
    font-size: 0.875rem;
}

/* Mobile Styles */
@media (max-width: 900px) {
    .hero {
        flex-direction: column;
        padding-top: 6rem;
        text-align: center;
        gap: 3rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

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

    .hero-phone-img {
        width: 240px;
        transform: none;
    }

    .screenshot-item img {
        width: 180px;
    }

    .step-arrow {
        display: none;
    }

    .steps {
        flex-direction: column;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all 0.3s ease;
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

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

    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .section-header h2 {
        font-size: 1.75rem;
    }

    .hero-stats {
        gap: 1.5rem;
    }

    .stat-number {
        font-size: 1.5rem;
    }

    .cta-content h2 {
        font-size: 1.75rem;
    }

    .btn {
        padding: 0.875rem 1.5rem;
        font-size: 0.95rem;
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.hero-visual {
    animation-delay: 0.2s;
}

.feature-card {
    animation: fadeInUp 0.6s ease-out;
    animation-fill-mode: both;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }
.feature-card:nth-child(5) { animation-delay: 0.5s; }
.feature-card:nth-child(6) { animation-delay: 0.6s; }
.feature-card:nth-child(7) { animation-delay: 0.7s; }
.feature-card:nth-child(8) { animation-delay: 0.8s; }