/* OAICA PWA — responsive, mobile-first, dark. No framework. */
:root {
  --bg: #0b0d12;
  --surface: #14171f;
  --surface-2: #1c2029;
  --text: #e6e8ee;
  --muted: #8a90a0;
  --brand: #6B1D2A;
  --brand-2: #b5462e;
  --accent: #3fb950;
  --radius: 14px;
  --maxw: 760px;
  --pad: clamp(12px, 4vw, 24px);
  --safe-b: env(safe-area-inset-bottom, 0px);
}
@media (prefers-color-scheme: light) {
  :root { --bg:#f7f8fa; --surface:#ffffff; --surface-2:#eef0f4; --text:#161a22; --muted:#5b6270; --brand:#6B1D2A; }
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
  display: flex; flex-direction: column; height: 100dvh;
  -webkit-text-size-adjust: 100%;
}
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px var(--pad); border-bottom: 1px solid var(--surface-2);
  background: var(--surface); position: sticky; top: 0; z-index: 2; gap: 10px;
}
.brand { display: flex; align-items: center; gap: 8px; }
.brand-mark { border-radius: 7px; }
.brand-name { font-weight: 700; letter-spacing: .04em; }
.tagline { color: var(--muted); font-size: 12px; }
.status { margin-left: auto; font-size: 12px; color: var(--accent); }

.packs {
  display: flex; gap: 8px; padding: 10px var(--pad); overflow-x: auto;
  background: var(--bg); border-bottom: 1px solid var(--surface-2);
}
.packs button {
  background: var(--surface); color: var(--text); border: 1px solid var(--surface-2);
  border-radius: 18px; padding: 6px 12px; white-space: nowrap; cursor: pointer; font: inherit;
}
.packs button.on { border-color: var(--accent); color: var(--accent); }

.features {
  display: flex; gap: 12px; padding: 8px var(--pad); flex-wrap: wrap; font-size: 13px;
  background: var(--bg); border-bottom: 1px solid var(--surface-2); align-items: center;
}
.features label { display: flex; gap: 4px; align-items: center; cursor: pointer; }
.features select {
  background: var(--surface); color: var(--text); border: 1px solid var(--surface-2);
  border-radius: 6px; padding: 4px 8px; font-size: 13px;
}

.chat {
  flex: 1; overflow-y: auto; padding: var(--pad);
  display: flex; flex-direction: column; gap: 10px;
  max-width: var(--maxw); width: 100%; margin: 0 auto;
}
.empty { margin: auto; text-align: center; max-width: 520px; }
.empty h1 { font-size: clamp(22px, 6vw, 30px); margin: 0 0 6px; }
.empty p { color: var(--muted); margin: 0 0 18px; }
.empty .model { display: flex; gap: 10px; align-items: center; justify-content: center; flex-wrap: wrap; font-size: 13px; }
.empty .model #model-status { color: var(--text); }
.file-btn {
  display: inline-flex; align-items: center; gap: 4px;
  background: var(--brand); color: #fff; border: none; border-radius: 8px;
  padding: 6px 12px; cursor: pointer; font: inherit; font-weight: 500;
}
.seed-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; }
.seed {
  text-align: left; background: var(--surface); border: 1px solid var(--surface-2);
  border-radius: var(--radius); padding: 12px 14px; color: var(--text); cursor: pointer;
  font: inherit; transition: border-color .15s, transform .05s;
}
.seed:hover { border-color: var(--brand-2); }
.seed:active { transform: scale(.98); }

.msg { max-width: 100%; white-space: pre-wrap; word-break: break-word; }
.msg .role { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; margin-bottom: 2px; }
.msg.assistant .bubble { background: var(--surface); }
.bubble {
  background: var(--surface-2); border-radius: var(--radius);
  padding: 10px 14px;
}
.msg.user { align-self: flex-end; max-width: 80%; }
.msg.user .bubble { background: var(--brand); color: #fff; }
.msg.user .role { text-align: right; }
.msg.tool .bubble { background: #1a2330; border-left: 3px solid var(--accent); }
.msg.sub-agent .bubble { background: #1f1620; border-left: 3px solid var(--brand-2); }
.msg.synthesis .bubble { background: #142019; border-left: 3px solid var(--accent); }

.composer {
  max-width: var(--maxw); width: 100%; margin: 0 auto;
  display: flex; gap: 8px; padding: calc(var(--pad) * .6) var(--pad) calc(var(--pad) * .6 + var(--safe-b));
  background: var(--bg); border-top: 1px solid var(--surface-2);
}
#input {
  flex: 1; resize: none; max-height: 140px; background: var(--surface);
  color: var(--text); border: 1px solid var(--surface-2); border-radius: var(--radius);
  padding: 10px 12px; font: inherit; line-height: 1.4;
}
#input:focus { outline: none; border-color: var(--brand-2); }
#send {
  width: 44px; height: 44px; flex: 0 0 auto; border: none; border-radius: 12px;
  background: var(--brand); color: #fff; font-size: 20px; cursor: pointer;
}
#send:disabled { opacity: .4; }

.disc {
  font-size: 12px; color: var(--muted);
  padding: 0 var(--pad) calc(var(--pad) * .6 + var(--safe-b));
  text-align: center; max-width: var(--maxw); margin: 0 auto;
}

@media (min-width: 600px) {
  .seed-grid { grid-template-columns: repeat(3, 1fr); }
  #send { width: 48px; height: 48px; }
}
@media (min-width: 900px) {
  :root { --maxw: 820px; }
}