* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --orange-primary: #FF6B35;
    --orange-light: #FF8A65;
    --orange-dark: #E55100;
    --text-primary: #1A1A1A;
    --text-secondary: #6B7280;
    --surface: #FFFFFF;
    --surface-variant: #FAFAFA;
    --border: #F3F4F6;
    --shadow: rgba(0, 0, 0, 0.05);
    --shadow-strong: rgba(0, 0, 0, 0.1);
    --radius-small: 6px;
    --radius-medium: 12px;
    --radius-large: 20px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--surface);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Header */
.navbar {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--orange-primary);
    letter-spacing: -0.02em;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
    align-items: center;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: color 150ms ease;
    position: relative;
}

.nav-menu a:hover {
    color: var(--orange-primary);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--orange-primary);
    transition: width 150ms ease;
}

.nav-menu a:hover::after {
    width: 100%;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--surface) 0%, var(--surface-variant) 100%);
    padding: 120px 0 80px;
    text-align: center;
    margin-top: 72px;
}

.hero-content h2 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.hero-content p {
    font-size: 18px;
    margin-bottom: 32px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    color: var(--text-secondary);
    line-height: 1.6;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: var(--radius-small);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: all 150ms ease;
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--orange-primary);
    color: white;
    box-shadow: 0 2px 8px var(--shadow-strong);
}

.btn-primary:hover {
    background: var(--orange-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--shadow-strong);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--surface-variant);
    border-color: var(--orange-primary);
    color: var(--orange-primary);
}

.btn-app {
    background: var(--text-primary);
    color: white;
    margin: 8px;
}

.btn-app:hover {
    background: var(--text-secondary);
    transform: translateY(-1px);
}

/* Sections */
section {
    padding: 80px 0;
}

.about {
    background: var(--surface-variant);
}

.about h2,
.features h2,
.download h2,
.contact h2 {
    font-size: 32px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.about p {
    font-size: 16px;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Features */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
    margin-top: 48px;
}

.feature {
    background: var(--surface);
    padding: 32px 24px;
    border-radius: var(--radius-medium);
    box-shadow: 0 2px 8px var(--shadow);
    border: 1px solid var(--border);
    text-align: center;
    transition: all 150ms ease;
    position: relative;
}

.feature:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--shadow-strong);
    border-color: var(--orange-primary);
}

.feature h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 14px;
}

/* Download */
.download {
    background: var(--text-primary);
    color: white;
    text-align: center;
}

.download h2 {
    color: white;
}

.download p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 16px;
    margin-bottom: 32px;
}

.download-buttons {
    margin-top: 32px;
}

/* Contact */
.contact {
    background: var(--surface-variant);
    text-align: center;
}

.contact-info {
    max-width: 400px;
    margin: 0 auto;
    font-size: 16px;
}

.contact-info p {
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.contact-info strong {
    color: var(--text-primary);
}

/* Footer */
footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 32px 0;
    text-align: center;
}

footer p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 16px;
}

.footer-nav {
    display: flex;
    justify-content: center;
    gap: 24px;
}

.footer-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 150ms ease;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        flex-direction: column;
        gap: 16px;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--surface);
        border-bottom: 1px solid var(--border);
        padding: 16px 0;
        display: none;
    }
    
    .hero-content h2 {
        font-size: 32px;
    }
    
    .hero-content p {
        font-size: 16px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 200px;
    }
    
    .container {
        padding: 0 16px;
    }
    
    section {
        padding: 48px 0;
    }
    
    .footer-nav {
        flex-direction: column;
        gap: 12px;
    }
}

@media (max-width: 480px) {
    .hero-content h2 {
        font-size: 28px;
    }
    
    .feature {
        padding: 24px 16px;
    }
    
    .about h2,
    .features h2,
    .download h2,
    .contact h2 {
        font-size: 24px;
    }
}

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

/* Focus styles for accessibility */
.btn:focus,
.nav-menu a:focus {
    outline: 2px solid var(--orange-primary);
    outline-offset: 2px;
}

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

.feature {
    animation: fadeInUp 0.3s ease forwards;
}