:root {
  --void: #05070d;
  --navy: #070b14;
  --panel: #0c1220;
  --stroke: rgba(255, 255, 255, 0.1);
  --text: #f4f7fb;
  --muted: #9aa6b8;
  --cyan: #2ee6d6;
  --gold: #d6c07a;
  --err: #ff6b7a;
  --ok: #3dd68c;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  --radius: 18px;
  --sans: "Segoe UI", "Helvetica Neue", Helvetica, Arial, ui-sans-serif, system-ui, sans-serif;
}
* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0; background: var(--navy); color: var(--text);
  font-family: var(--sans); font-synthesis: none; -webkit-font-smoothing: antialiased;
}
body {
  min-height: 100vh;
  background:
    radial-gradient(900px 500px at 80% -10%, rgba(46, 230, 214, 0.12), transparent 55%),
    radial-gradient(700px 400px at -10% 110%, rgba(214, 192, 122, 0.08), transparent 50%),
    var(--navy);
}
a { color: var(--cyan); text-decoration: none; }
button, input, textarea { font: inherit; }
.wrap { width: min(1100px, calc(100% - 2rem)); margin: 0 auto; }
.top {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 0 0.5rem;
}
.brand { display: flex; align-items: center; gap: 0.75rem; color: inherit; }
.brand img { width: 40px; height: 40px; border-radius: 10px; }
.brand strong { letter-spacing: 0.04em; }
.nav { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.nav button, .ghost {
  background: transparent; color: var(--text); border: 1px solid var(--stroke);
  border-radius: 999px; padding: 0.45rem 0.9rem; cursor: pointer;
}
.nav button.active, .primary {
  background: linear-gradient(180deg, #1b2a3a, #101826);
  border-color: rgba(46, 230, 214, 0.45);
  color: var(--text); cursor: pointer;
}
.primary {
  background: linear-gradient(180deg, #2ee6d6, #149e93);
  color: #04221f; font-weight: 700; border: 0; border-radius: 999px;
  padding: 0.75rem 1.2rem; box-shadow: var(--shadow);
}
.secondary {
  background: transparent; color: var(--text); border: 1px solid var(--stroke);
  border-radius: 999px; padding: 0.75rem 1.2rem; cursor: pointer;
}
.hero { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 2rem; padding: 2.2rem 0 1rem; align-items: center; }
.kicker { color: var(--gold); letter-spacing: 0.14em; text-transform: uppercase; font-size: 0.75rem; margin: 0 0 0.6rem; }
h1 { font-size: clamp(2.2rem, 5vw, 4rem); line-height: 0.95; margin: 0 0 1rem; letter-spacing: -0.04em; }
.lede { color: var(--muted); font-size: 1.08rem; max-width: 40rem; line-height: 1.55; }
.cta-row { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-top: 1.4rem; }
.app-card {
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.015));
  border: 1px solid var(--stroke); border-radius: 28px; padding: 1.4rem;
  text-align: center; box-shadow: var(--shadow);
}
.app-card img {
  width: 168px; height: 168px; border-radius: 36px;
  box-shadow: 0 16px 40px rgba(0,0,0,0.45);
}
.app-card h2 { margin: 0.9rem 0 0.3rem; font-size: 1.3rem; }
.app-card p { color: var(--muted); margin: 0 0 1rem; }
.grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.8rem; padding: 0.5rem 0 2rem; }
.card {
  background: var(--panel); border: 1px solid var(--stroke); border-radius: var(--radius);
  padding: 1rem 1.05rem;
}
.card h3 { margin: 0 0 0.35rem; font-size: 1rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.92rem; line-height: 1.45; }
.view { display: none; padding-bottom: 4rem; }
.view.on { display: block; }
.panel {
  background: var(--panel); border: 1px solid var(--stroke); border-radius: 22px;
  padding: 1.2rem; box-shadow: var(--shadow);
}
label { display: block; font-size: 0.82rem; color: var(--muted); margin: 0.7rem 0 0.3rem; }
input, textarea {
  width: 100%; background: #080d16; color: var(--text); border: 1px solid var(--stroke);
  border-radius: 12px; padding: 0.7rem 0.8rem;
}
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.auth-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 1rem; }
.chat-shell { display: grid; grid-template-rows: auto 1fr auto; min-height: 68vh; }
.fuelbar { display: flex; justify-content: space-between; gap: 1rem; align-items: center; color: var(--muted); font-size: 0.88rem; }
.feed { overflow: auto; padding: 0.6rem 0 1rem; display: flex; flex-direction: column; gap: 0.7rem; }
.bubble { max-width: 80%; padding: 0.75rem 0.9rem; border-radius: 16px; line-height: 1.5; white-space: pre-wrap; }
.bubble.user { margin-left: auto; background: #16313a; }
.bubble.bot { background: #101826; border: 1px solid var(--stroke); }
.composer { display: grid; grid-template-columns: 1fr auto; gap: 0.6rem; }
.packs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.8rem; margin-top: 1rem; }
.pack { border: 1px solid var(--stroke); border-radius: 16px; padding: 1rem; background: #0a101b; }
.pack strong { display: block; font-size: 1.2rem; margin-bottom: 0.25rem; }
.notice { color: var(--gold); font-size: 0.9rem; }
.err { color: var(--err); min-height: 1.2rem; }
.ok { color: var(--ok); }
pre {
  overflow: auto; background: #05070d; border: 1px solid var(--stroke);
  border-radius: 14px; padding: 0.9rem; color: #7ee0c2; font-size: 0.86rem;
}
.foot { color: var(--muted); font-size: 0.8rem; padding: 1.5rem 0 2rem; }
.keybox { word-break: break-all; background: #05070d; border: 1px dashed var(--stroke); border-radius: 12px; padding: 0.8rem; }
@media (max-width: 820px) {
  .hero, .grid, .auth-grid, .row, .packs { grid-template-columns: 1fr; }
  .app-card img { width: 132px; height: 132px; }
}