:root {
    --text-primary: #2a1810;
    --text-secondary: #5a453a;
    --bg-primary: #ffebe0;
    --bg-secondary: #ffd9c7;
    --bg-card: #fff5f0;
    --border-color: #ffcdb3;
    --accent-orange: #ff6b35;
    --badge-ios: #007aff;
    --badge-macos: #1a1a1a;
    --max-width: 1200px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

p {
    margin-bottom: 1em;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: none;
    z-index: 100;
}

nav {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-md);
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    font-weight: 600;
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
}

.nav-links a {
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

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

main {
    margin-top: 80px;
    min-height: calc(100vh - 160px);
}

section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
}

footer {
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-md);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* App Logo */
.app-logo {
    width: 180px;
    height: 180px;
    object-fit: contain;
    margin: 0 auto var(--spacing-md);
    display: block;
}

/* Hero Buttons */
.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
    justify-content: center;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    background: var(--text-primary);
    color: white;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-secondary:hover {
    border-color: var(--text-primary);
}

/* GitHub Link */
.github-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.github-icon {
    width: 20px;
    height: 20px;
}

@media (max-width: 768px) {
    :root {
        --spacing-md: 1.5rem;
        --spacing-lg: 2rem;
        --spacing-xl: 3rem;
    }
    
    .nav-links {
        gap: var(--spacing-sm);
    }
    
    section {
        padding: var(--spacing-lg) var(--spacing-sm);
    }
}