:root {
    --background: 0 0% 100%;
    --foreground: 240 10% 3.9%;
    --card: 0 0% 100%;
    --card-foreground: 240 10% 3.9%;
    --popover: 0 0% 100%;
    --popover-foreground: 240 10% 3.9%;
    --primary: 240 5.9% 10%;
    --primary-foreground: 0 0% 98%;
    --secondary: 240 4.8% 95.9%;
    --secondary-foreground: 240 5.9% 10%;
    --muted: 240 4.8% 95.9%;
    --muted-foreground: 240 3.8% 46.1%;
    --accent: 240 4.8% 95.9%;
    --accent-foreground: 240 5.9% 10%;
    --destructive: 0 84.2% 60.2%;
    --destructive-foreground: 0 0% 98%;
    --border: 240 5.9% 90%;
    --input: 240 5.9% 90%;
    --ring: 240 5.9% 10%;
    --radius: 0.5rem;
}

@media (prefers-color-scheme: dark) {
    :root {
        --background: 240 10% 3.9%;
        --foreground: 0 0% 98%;
        --card: 240 10% 3.9%;
        --card-foreground: 0 0% 98%;
        --popover: 240 10% 3.9%;
        --popover-foreground: 0 0% 98%;
        --primary: 0 0% 98%;
        --primary-foreground: 240 5.9% 10%;
        --secondary: 240 3.7% 15.9%;
        --secondary-foreground: 0 0% 98%;
        --muted: 240 3.7% 15.9%;
        --muted-foreground: 240 5% 64.9%;
        --accent: 240 3.7% 15.9%;
        --accent-foreground: 0 0% 98%;
        --destructive: 0 62.8% 30.6%;
        --destructive-foreground: 0 0% 98%;
        --border: 240 3.7% 15.9%;
        --input: 240 3.7% 15.9%;
        --ring: 240 4.9% 83.9%;
    }
}

* {
    box-sizing: border-box;
}

body {
    background-color: hsl(var(--background));
    color: hsl(var(--foreground));
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 42rem;
    /* approx max-w-2xl */
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* Nav */
nav {
    display: flex;
    margin-bottom: 3rem;
    gap: 1.5rem;
}

nav a {
    color: hsl(var(--muted-foreground));
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color 0.2s;
}

nav a:hover,
nav a.active {
    color: hsl(var(--foreground));
}

/* Typography, similar to Tailwind prose but minimal */
h1 {
    font-size: 2.25rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    margin-top: 0;
    margin-bottom: 0.5rem;
}

p {
    color: hsl(var(--muted-foreground));
    margin-top: 0;
}

.lead {
    font-size: 1.125rem;
    color: hsl(var(--muted-foreground));
    margin-bottom: 2rem;
}

/* Button variants */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    height: 2.5rem;
    padding: 0 1rem;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
    min-width: 140px;
}

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

.btn-primary:hover {
    opacity: 0.9;
}

.btn-outline {
    border: 1px solid hsl(var(--border));
    background: transparent;
    color: hsl(var(--foreground));
}

.btn-outline:hover {
    background-color: hsl(var(--accent));
    color: hsl(var(--accent-foreground));
}

/* Cards */
.grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

@media(min-width: 600px) {
    .grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.card {
    border: 1px solid hsl(var(--border));
    border-radius: var(--radius);
    background: hsl(var(--card));
    color: hsl(var(--card-foreground));
    padding: 1.5rem;
    text-decoration: none;
    transition: all 0.2s;
}

.card:hover {
    background-color: hsl(var(--accent));
    border-color: hsl(var(--accent));
}

.card h3 {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
}

.card p {
    font-size: 0.875rem;
    margin-top: 0.5rem;
    margin-bottom: 0;
}