:root {
    --bg:        #111110;
    --bg-card:   #1a1a18;
    --border:    #282825;
    --text:      #eaeae6;
    --muted:     #6e6e6a;
    --accent:    oklch(65% 0.16 248);
    --accent-dim: oklch(65% 0.16 248 / 0.12);

    --font-sans: "DM Sans", system-ui, sans-serif;
    --font-mono: "DM Mono", monospace;
    --radius:    12px;
    --max-width: 1020px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.55;
    min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* -------- Header -------- */

header {
    position: sticky;
    top: 0;
    z-index: 10;
    transition: background 0.25s, border-color 0.25s;
    border-bottom: 1px solid transparent;
}

header.scrolled {
    background: rgba(17, 17, 16, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom-color: var(--border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 32px;
    max-width: var(--max-width);
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 9px;
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 500;
    letter-spacing: -0.01em;
    color: var(--text);
}

.logo img { border-radius: 6px; }

header nav { display: flex; gap: 28px; }

header nav a {
    font-family: var(--font-mono);
    color: var(--muted);
    font-size: 12px;
    transition: color 0.15s;
}

header nav a:hover { color: var(--text); }

/* -------- Main -------- */

main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 32px;
}

/* -------- Hero -------- */

.hero {
    text-align: center;
    padding: 56px 0 88px;
}

h1 {
    font-size: clamp(40px, 7vw, 72px);
    font-weight: 300;
    letter-spacing: -0.035em;
    line-height: 1.02;
    margin: 0 0 24px;
    color: var(--text);
    font-family: var(--font-sans);
}

.subhead {
    font-size: clamp(16px, 2vw, 19px);
    color: var(--muted);
    max-width: 540px;
    margin: 0 auto 40px;
    line-height: 1.55;
    font-weight: 300;
}

.cta {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.requirements {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--muted);
    letter-spacing: 0.02em;
}

.screenshot {
    margin: 56px auto 0;
    max-width: 380px;
    width: 100%;
    border-radius: 16px;
}

/* -------- Buttons -------- */

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 26px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: transform 0.12s, box-shadow 0.12s, background 0.15s;
    text-align: center;
    background: var(--text);
    color: var(--bg);
}

.btn-primary:hover {
    background: #d0d0cc;
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

/* -------- Section rule -------- */

.section-rule {
    height: 1px;
    background: var(--border);
    max-width: var(--max-width);
    margin: 0 auto;
}

/* -------- Features -------- */

.features { padding: 0; }

.feature-list {
    display: flex;
    flex-direction: column;
}

.feature-row {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 40px;
    align-items: baseline;
    padding: 32px 0;
    border-bottom: 1px solid var(--border);
}

.feature-row:first-child { border-top: none; }
.feature-row:last-child { border-bottom: none; }

.feature-name {
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 500;
    color: var(--text);
    letter-spacing: -0.01em;
}

.feature-desc {
    font-size: 15px;
    color: var(--muted);
    line-height: 1.6;
    font-weight: 300;
    max-width: 560px;
}

/* -------- Footer -------- */

footer {
    border-top: 1px solid var(--border);
    padding: 24px 32px;
    margin-top: 40px;
}

.footer-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.footer-brand {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--muted);
    letter-spacing: 0.02em;
}

footer nav { display: flex; gap: 24px; }

footer nav a {
    font-family: var(--font-mono);
    color: var(--muted);
    font-size: 11px;
    border-bottom: 1px solid transparent;
    padding-bottom: 1px;
    transition: color 0.15s, border-color 0.15s;
}

footer nav a:hover {
    color: var(--text);
    border-bottom-color: var(--text);
}

/* -------- Responsive -------- */

@media (max-width: 720px) {
    .feature-row {
        grid-template-columns: 1fr;
        gap: 8px;
        padding: 24px 0;
    }
}

@media (max-width: 640px) {
    .header-inner { padding: 16px 20px; }
    header nav { gap: 18px; }
    main { padding: 0 20px; }
    footer { padding: 24px 20px; }
    .hero { padding: 40px 0 60px; }
    .screenshot { margin-top: 40px; }
}