/* GPT Raven — public site.
   The app's own look: the neutral dark of the chat it hosts, monospace for what runs,
   the app's status colours, and the violet of its icon as the one accent. System
   fonts, as in the app — nothing is loaded from anyone else's servers. */

:root {
    --bg:        #121214;
    --panel:     #1f1f23;
    --panel-2:   #26262b;
    --line:      #35353c;
    --text:      #ececef;
    --muted:     #a0a0a8;
    --faint:     #6e6e76;
    --accent:    #a28fdf;
    --accent-2:  #7a63c0;
    --ok:        #3fb950;
    --run:       #64b5f6;
    --wait:      #e3b341;
    --bad:       #f48771;
    --radius:    16px;
    --maxw:      1160px;
    --font:      -apple-system, "Segoe UI", Roboto, "Noto Sans", Ubuntu, "Helvetica Neue", sans-serif;
    --mono:      ui-monospace, "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    font-size: 17px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
h1, h2, h3 { line-height: 1.15; letter-spacing: -0.015em; margin: 0; font-weight: 650; }
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding-inline: 24px; }

/* ---------- backdrop: the app's window, screen-sized, tilted and out of focus ---------- */
.backdrop { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; --scroll: 0; --bd-scale: 1.6; }
.backdrop::after {
    content: ""; position: absolute; inset: 0;
    background:
        linear-gradient(to bottom, rgba(18, 18, 20, 0.8), rgba(18, 18, 20, 0.74) 45%, rgba(18, 18, 20, 0.86));
}
.bd-shift { position: absolute; inset: 0; perspective: 1800px; transform: translate3d(0, calc(var(--scroll) * -0.04px), 0); }
.bd-plane {
    position: absolute; left: 50%; top: 50%; width: 1200px; height: 800px;
    transform: translate(-50%, -50%) rotateX(11deg) rotateY(-7deg) rotateZ(-2.5deg) scale(var(--bd-scale));
    filter: blur(5px);
}
.bd-win {
    width: 1200px; height: 800px; display: flex; flex-direction: column;
    border-radius: 20px; overflow: hidden; background: #242428; border: 1px solid #34343b;
    font: 15px/1.5 -apple-system, "Segoe UI", Roboto, "Noto Sans", Ubuntu, sans-serif; color: #d6d6db;
}
.bd-title { height: 34px; flex: none; display: flex; gap: 8px; align-items: center; padding: 0 16px; background: #1e1e22; border-bottom: 1px solid #303036; }
.bd-title i { width: 12px; height: 12px; border-radius: 50%; background: #ff5f57; }
.bd-title i:nth-child(2) { background: #febc2e; }
.bd-title i:nth-child(3) { background: #28c840; }
.bd-title b { margin-left: 10px; font-size: 13px; color: #b5b5bb; }
.bd-main { flex: 1; display: flex; min-height: 0; }
.bd-side { width: 260px; flex: none; background: #1b1b1f; border-right: 1px solid #2d2d33; padding: 16px 12px; }
.bd-side-head { font-weight: 650; font-size: 17px; padding: 2px 10px 12px; color: #ececef; }
.bd-item { padding: 7px 10px; border-radius: 9px; font-size: 14.5px; color: #c9c9ce; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bd-item.on { background: #2c2c32; }
.bd-label { font-size: 13px; color: #7a7a82; padding: 14px 10px 6px; }
.bd-chat { flex: 1; display: flex; flex-direction: column; padding: 28px 0 18px; min-width: 0; }
.bd-thread { width: 680px; margin: 0 auto; flex: 1; display: flex; flex-direction: column; justify-content: flex-end; gap: 14px; overflow: hidden; }
.bd-user { align-self: flex-end; max-width: 75%; background: #36363d; padding: 10px 16px; border-radius: 20px; color: #ececef; }
.bd-bot { color: #d9d9de; }
.bd-cmd { border: 1px solid #3f3f47; border-radius: 14px; overflow: hidden; background: #1c1c20; }
.bd-cmd-head { display: flex; align-items: center; gap: 4px; padding: 8px 12px; background: #29292f; font-size: 13px; color: #a3a3aa; }
.bd-cmd-head .raven { color: #b3a2ea; font-weight: 600; }
.bd-cmd-head .host { color: #ececef; font-weight: 600; }
.bd-cmd-head .chip { margin-left: auto; color: #3fb950; font-weight: 600; font-size: 12px; }
.bd-cmd pre { margin: 0; padding: 10px 14px; font: 13.5px/1.55 ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace; color: #e2e2e6; white-space: pre-wrap; }
.bd-pills { width: 720px; margin: 12px auto 8px; display: flex; gap: 8px; font-size: 13px; }
.bd-pills span { padding: 3px 12px; border: 1px solid #45454d; border-radius: 999px; background: #2a2a30; }
.bd-pills .gap { flex: 1; border: 0; background: none; padding: 0; }
.bd-composer { width: 720px; margin: 0 auto; flex: none; border-radius: 28px; background: #34343a; padding: 13px 20px; color: #85858c; }
.bd-term { flex: none; height: 150px; background: #161618; border-top: 1px solid #2d2d33; padding: 12px 22px; font: 13px/1.6 ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace; color: #cfcfd4; }
.bd-term .cmd { color: #b3a2ea; }
.bd-term .ok { color: #3fb950; }
.bd-term .dim { color: #7a7a82; }

/* ---------- buttons ---------- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    height: 46px; padding-inline: 22px; border-radius: 999px;
    font-weight: 600; font-size: 15.5px; border: 1px solid transparent; cursor: pointer;
    transition: transform .15s ease, background .2s ease, border-color .2s ease, box-shadow .2s ease;
    white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
    background: linear-gradient(135deg, #9580d6, var(--accent-2));
    color: #fff;
    box-shadow: 0 6px 18px -12px rgba(149, 128, 214, 0.6);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 8px 22px -10px rgba(149, 128, 214, 0.65); }
.btn-ghost { background: rgba(255,255,255,0.03); border-color: var(--line); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm { height: 38px; font-size: 14.5px; padding-inline: 17px; }

/* ---------- nav ---------- */
.nav {
    position: sticky; top: 0; z-index: 50;
    backdrop-filter: blur(14px);
    background: color-mix(in srgb, var(--bg) 75%, transparent);
    border-bottom: 1px solid transparent;
    transition: border-color .3s ease;
}
.nav.scrolled { border-bottom-color: var(--line); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 11px; font-weight: 650; font-size: 17.5px; letter-spacing: -0.01em; }
.brand .mark { width: 30px; height: 30px; display: block; }

/* ---------- hero ---------- */
.hero { position: relative; padding: 56px 0 30px; overflow: hidden; }
.glow {
    position: absolute; inset: -30% -10% auto -10%; height: 620px; z-index: 0; pointer-events: none;
    background:
        radial-gradient(38% 50% at 30% 30%, rgba(162, 143, 223, 0.16), transparent 70%),
        radial-gradient(40% 55% at 75% 20%, rgba(122, 99, 192, 0.12), transparent 70%);
    filter: blur(40px);
    animation: drift 26s ease-in-out infinite alternate;
}
@keyframes drift {
    from { transform: translate3d(0, 0, 0); }
    to   { transform: translate3d(-3%, 4%, 0) scale(1.05); }
}
.hero-stack { position: relative; z-index: 1; text-align: center; }
.hero h1 { font-size: clamp(28px, 3.6vw, 42px); max-width: 820px; margin-inline: auto; }
.hero h1 .accent { color: var(--accent); }
.hero .lede { max-width: 600px; margin: 16px auto 0; font-size: clamp(15px, 1.5vw, 17px); color: var(--muted); }

/* ---------- sections ---------- */
section { position: relative; }
.band { padding-block: 100px; }
.section-head { max-width: 680px; margin-bottom: 44px; }
.section-head h2 { font-size: clamp(24px, 3vw, 32px); }
.section-head p { margin-top: 12px; font-size: 16px; color: var(--muted); }
.divider { height: 1px; background: linear-gradient(90deg, transparent, var(--line), transparent); }

/* features */
.grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.card {
    background: linear-gradient(180deg, var(--panel), var(--panel-2));
    border: 1px solid var(--line); border-radius: var(--radius); padding: 24px;
    transition: border-color .2s ease, transform .2s ease;
}
.card:hover { border-color: color-mix(in srgb, var(--accent) 40%, var(--line)); transform: translateY(-3px); }
.card .ic {
    width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center; margin-bottom: 16px;
    background: rgba(162, 143, 223, 0.1); border: 1px solid rgba(162, 143, 223, 0.25); color: var(--accent);
}
.card h3 { font-size: 18px; margin-bottom: 8px; }
.card p { margin: 0; font-size: 15px; color: var(--muted); }

/* downloads: one row per platform — icon, name and detail, version on the right */
.section-head.get-head { display: flex; align-items: center; gap: 14px; max-width: none; margin-bottom: 28px; }
.get-mark { width: 36px; height: 36px; flex: none; }
.platforms { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.plat {
    display: grid; grid-template-columns: 28px 1fr auto; grid-template-rows: auto auto;
    column-gap: 14px; align-items: center;
    padding: 14px 18px; border-radius: 14px;
    border: 1px solid var(--line); background: linear-gradient(180deg, var(--panel), var(--panel-2));
    transition: border-color .2s ease, background .2s ease;
}
.plat .os { grid-row: 1 / 3; width: 26px; height: 26px; color: var(--text); }
.plat .name { font-weight: 600; font-size: 15px; line-height: 1.3; }
.plat .sub { grid-column: 2; color: var(--muted); font-size: 12.5px; line-height: 1.35; }
.plat .meta { grid-column: 3; grid-row: 1 / 3; color: var(--faint); font-family: var(--mono); font-size: 11.5px; white-space: nowrap; }
a.plat[href] { cursor: pointer; }
a.plat[href] .meta { color: var(--accent); }
a.plat[href]:hover { border-color: color-mix(in srgb, var(--accent) 55%, var(--line)); background: rgba(162, 143, 223, 0.06); }
.plat.soon { opacity: 0.45; }
.plat.tomb { filter: grayscale(1); opacity: 0.45; }
.plat.tomb .name { color: var(--muted); }
.dl-empty { color: var(--muted); font-size: 15px; margin-top: 14px; }

/* legal pages */
.legal { max-width: 760px; padding-block: 60px 90px; }
.legal h1 { font-size: clamp(28px, 4vw, 38px); margin-bottom: 8px; }
.legal .updated { color: var(--faint); font-size: 14px; margin: 0 0 32px; }
.legal h2 { font-size: 20px; margin: 32px 0 10px; }
.legal h3 { font-size: 16.5px; margin: 20px 0 8px; }
.legal p, .legal li { color: var(--muted); font-size: 16px; }
.legal p { margin: 0 0 12px; }
.legal ul { margin: 0 0 12px; padding-left: 20px; display: grid; gap: 6px; }
.legal a { color: var(--accent); }
.legal a:hover { text-decoration: underline; }
.legal strong { color: var(--text); font-weight: 600; }
.legal .note { border-left: 2px solid var(--line); padding-left: 14px; }

/* footer */
footer { border-top: 1px solid var(--line); padding-block: 42px; color: var(--muted); }
.foot { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.foot .brand { color: var(--text); }
.foot-legal { display: flex; gap: 22px; font-size: 14px; }
.foot-legal a:hover { color: var(--text); }
.foot .fine { font-size: 13px; color: var(--faint); width: 100%; }

/* reveal on scroll */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

@media (max-width: 900px) {
    .platforms { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
    body { font-size: 16px; }
    .grid { grid-template-columns: 1fr; }
    .platforms { grid-template-columns: 1fr; }
    .band { padding-block: 72px; }
    .foot { flex-direction: column; align-items: flex-start; }
}
@media (prefers-reduced-motion: reduce) {
    .glow { animation: none; }
    .reveal { transition: none; opacity: 1; transform: none; }
    html { scroll-behavior: auto; }
}