/* keffals.gg — minimal black and white */
:root {
    --black: #000000;
    --white: #ffffff;
    --gray-100: #f5f5f5;
    --gray-200: #e0e0e0;
    --gray-400: #999999;
    --gray-600: #666666;
    --gray-800: #333333;
    --mono: "JetBrains Mono", "SF Mono", "Cascadia Mono", "Fira Code", monospace;
    --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

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

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

body {
    font-family: var(--sans);
    background: var(--white);
    color: var(--black);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    border-bottom: 1px solid var(--black);
    padding: 0 2rem;
    position: sticky;
    top: 0;
    background: var(--white);
    z-index: 100;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
}

nav a {
    color: var(--black);
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.15s;
}

nav a:hover {
    opacity: 0.6;
}

.logo {
    font-family: var(--mono);
    font-size: 1.125rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

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

.nav-links a {
    font-size: 0.875rem;
    text-transform: lowercase;
}

/* Main */
main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    gap: 6rem;
}

/* Hero */
.hero {
    text-align: center;
}

.hero h1 {
    font-family: var(--mono);
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 1;
}

.tagline {
    margin-top: 1rem;
    font-size: 1rem;
    color: var(--gray-400);
    text-transform: lowercase;
    letter-spacing: 0.05em;
}

/* Chat preview */
.chat-preview {
    width: 100%;
    max-width: 600px;
    text-align: center;
}

.chat-preview h2 {
    font-family: var(--mono);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 1.5rem;
    color: var(--gray-600);
}

.chat-placeholder {
    border: 1px solid var(--gray-200);
    padding: 3rem 2rem;
    color: var(--gray-400);
    font-size: 0.875rem;
}

/* Footer */
footer {
    border-top: 1px solid var(--black);
    padding: 1.5rem 2rem;
    text-align: center;
}

footer p {
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--gray-400);
}

/* Responsive */
@media (max-width: 600px) {
    .nav-links {
        gap: 1.25rem;
    }
    main {
        padding: 2rem 1rem;
        gap: 3rem;
    }
}