/* BigBrain LLC site — dark, violet accent, zero JavaScript. One sheet for every page.
   System font stack only; no external resources of any kind. */
:root {
    --bg: #12101a;
    --panel: #1a1726;
    --ink: #e8e4f2;
    --muted: #9a92b4;
    --accent: #7c4ce8;      /* 5.18:1 under white button text (WCAG AA); #8b5cf6 was 4.23 */
    --accent-hot: #a78bfa;
    --line: #2c2740;
}
* { margin: 0; padding: 0; box-sizing: border-box; }

/* Keyboard access: a skip link that appears on focus, and a visible focus ring on every
   interactive element (WCAG 2.4.1 / 2.4.7). */
.skip {
    position: absolute;
    left: -9999px;
    top: 0;
    background: var(--panel);
    color: var(--ink);
    padding: 0.6rem 1rem;
    border-radius: 0 0 8px 0;
    z-index: 10;
}
.skip:focus { left: 0; }
a:focus-visible, button:focus-visible, input:focus-visible {
    outline: 2px solid var(--accent-hot);
    outline-offset: 2px;
}
body {
    background: var(--bg);
    color: var(--ink);
    font: 17px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}
main { flex: 1; width: 100%; max-width: 960px; margin: 0 auto; padding: 2.5rem 1.25rem 3rem; }
img { max-width: 100%; height: auto; }

/* ---- header + nav (shared chrome on every page) ---- */
header.site {
    border-bottom: 1px solid var(--line);
    padding: 1rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}
header.site a.brand { color: var(--ink); text-decoration: none; font-weight: 700; letter-spacing: 0.02em; }
header.site a.brand span { color: var(--accent-hot); }
header.site nav { display: flex; gap: 1.25rem; flex-wrap: wrap; }
header.site nav a {
    color: var(--muted);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 600;
}
header.site nav a:hover { color: var(--ink); }
header.site nav a[aria-current="page"] { color: var(--accent-hot); }

h1 { font-size: 2.4rem; line-height: 1.15; margin-bottom: 1rem; letter-spacing: -0.01em; }
h2 { font-size: 1.3rem; margin: 2.25rem 0 0.75rem; color: var(--accent-hot); }
h3 { font-size: 1.05rem; margin: 0 0 0.35rem; }
p { margin: 0.75rem 0; }
a { color: var(--accent-hot); }
.muted { color: var(--muted); }
.hero { padding: 2.5rem 0 1rem; }
.hero .tag { color: var(--accent-hot); font-weight: 600; text-transform: uppercase; font-size: 0.8rem; letter-spacing: 0.12em; }
.hero .lede { font-size: 1.15rem; }

/* ---- product cards (home) ---- */
.cards { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; margin: 1.5rem 0; }
.card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}
.card img { border-radius: 8px; border: 1px solid var(--line); }
.card .spacer { flex: 1; }
.card a.more { font-weight: 700; text-decoration: none; }
.card a.more:hover { text-decoration: underline; }
.badge {
    display: inline-block;
    align-self: flex-start;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent-hot);
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 0.1rem 0.6rem;
}

/* ---- feature grid (product page) ---- */
.features { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 1.25rem 0; }
.feature {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 1rem 1.1rem;
}
.feature p { margin: 0; color: var(--muted); font-size: 0.95rem; }

/* ---- price block + buy button ---- */
.price {
    margin: 1.5rem 0;
    padding: 1.25rem 1.5rem;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 12px;
}
.price strong { font-size: 1.6rem; }
a.buy {
    display: inline-block;
    margin-top: 0.75rem;
    padding: 0.85rem 2.2rem;
    background: var(--accent);
    color: #fff;
    font-weight: 700;
    border-radius: 10px;
    text-decoration: none;
}
a.buy:hover { background: var(--accent-hot); color: var(--bg); }  /* 6.92:1 — white on the hot shade fails AA */

/* ---- screenshots ---- */
.shots { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 2rem 0; }
.shot { margin: 0; }
.shot img { border-radius: 12px; border: 1px solid var(--line); display: block; }
.shot figcaption { color: var(--muted); font-size: 0.85rem; margin-top: 0.4rem; }
.shot-wide { margin: 2rem 0; }
.shot-wide img { border-radius: 12px; border: 1px solid var(--line); display: block; }
.shot-wide figcaption { color: var(--muted); font-size: 0.85rem; margin-top: 0.4rem; }

/* ---- pricing matrix ---- */
.matrix { overflow-x: auto; margin: 1rem 0 1.5rem; }
.matrix table { width: 100%; border-collapse: collapse; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; }
.matrix th, .matrix td { text-align: left; padding: 0.65rem 0.9rem; border-bottom: 1px solid var(--line); font-size: 0.95rem; }
.matrix th { color: var(--muted); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; }
.matrix tr:last-child td { border-bottom: 0; }
a.buy-small {
    display: inline-block;
    padding: 0.35rem 1.1rem;
    background: var(--accent);
    color: #fff;
    font-weight: 700;
    font-size: 0.9rem;
    border-radius: 8px;
    text-decoration: none;
}
a.buy-small:hover { background: var(--accent-hot); color: var(--bg); }

/* ---- callouts + FAQ ---- */
.note {
    margin: 1.5rem 0;
    padding: 1rem 1.25rem;
    background: var(--panel);
    border-left: 3px solid var(--accent);
    border-radius: 0 12px 12px 0;
    color: var(--muted);
}
.note strong { color: var(--ink); }
.faq { margin: 1rem 0; }
.faq dt { font-weight: 700; margin-top: 1.1rem; }
.faq dd { margin: 0.25rem 0 0; color: var(--muted); }

ul { margin: 0.75rem 0 0.75rem 1.4rem; }
li { margin: 0.4rem 0; }
code, .key {
    font-family: ui-monospace, "Cascadia Code", monospace;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 0.1rem 0.4rem;
}
form.download { margin: 1.5rem 0; display: flex; gap: 0.6rem; flex-wrap: wrap; }
form.download input {
    flex: 1;
    min-width: 260px;
    padding: 0.7rem 0.9rem;
    background: var(--panel);
    color: var(--ink);
    border: 1px solid var(--line);
    border-radius: 8px;
    font: inherit;
}
form.download button {
    padding: 0.7rem 1.6rem;
    background: var(--accent);
    color: #fff;
    border: 0;
    border-radius: 8px;
    font: inherit;
    font-weight: 700;
    cursor: pointer;
}
form.download button:hover { background: var(--accent-hot); color: var(--bg); }
footer {
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: 0.85rem;
    padding: 1.25rem;
    text-align: center;
}
footer a { color: var(--muted); margin: 0 0.5rem; }
footer p { margin: 0.25rem 0; }

/* ---- small screens ---- */
@media (max-width: 700px) {
    h1 { font-size: 1.8rem; }
    .cards, .features, .shots { grid-template-columns: 1fr; }
    .hero { padding: 1.5rem 0 0.5rem; }
}