:root {
  --bg: #0b0f14;
  --bg2: #121820;
  --bg3: #1a2330;
  --fg: #e6edf3;
  --muted: #8b9bb0;
  --accent: #39ff88;
  --accent2: #2dd4ff;
  --danger: #ff4d6d;
  --warn: #ffcc66;
  --border: #243041;
  --chat-user: #1a2a3a;
  --chat-bot: #142018;
  --chat-tool: #221a10;
  --radius: 10px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: var(--sans);
  background: radial-gradient(1200px 600px at 10% -10%, #12201a 0%, transparent 50%),
              radial-gradient(900px 500px at 100% 0%, #0e1c2a 0%, transparent 45%),
              var(--bg);
  color: var(--fg);
}

.muted { color: var(--muted); }
.tiny { font-size: 12px; }
code { font-family: var(--mono); font-size: 12px; }
.row { display: flex; align-items: center; }
.gap { gap: 8px; }
.full { grid-column: 1 / -1; }

/* login */
.login-body {
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: 24px;
}
.login-card {
  width: min(400px, 100%);
  background: rgba(18, 24, 32, 0.92);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  box-shadow: 0 20px 60px rgba(0,0,0,.45);
}
.brand { text-align: center; margin-bottom: 18px; }
.brand h1 { margin: 8px 0 4px; letter-spacing: .12em; font-size: 22px; }
.skull { font-size: 36px; filter: drop-shadow(0 0 12px rgba(57,255,136,.35)); }
.login-form label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 12px; }
.login-form input, .composer textarea, select, .form-grid input, .form-grid textarea {
  width: 100%;
  margin-top: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--fg);
  border-radius: 8px;
  padding: 10px 12px;
  font: inherit;
}
.login-form button, #btn-send, .form-grid button, button {
  background: linear-gradient(180deg, #3dff95, #1fbf68);
  color: #04140a;
  border: 0;
  border-radius: 8px;
  padding: 10px 14px;
  font-weight: 700;
  letter-spacing: .04em;
  cursor: pointer;
}
.login-form button { width: 100%; margin-top: 6px; }
button:disabled { opacity: .45; cursor: not-allowed; }
button.ghost {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--border);
  font-weight: 600;
}
button.danger { border-color: var(--danger); color: var(--danger); }
.alert {
  background: rgba(255,77,109,.12);
  border: 1px solid rgba(255,77,109,.4);
  color: #ffb3c1;
  padding: 10px 12px;
  border-radius: 8px;
  margin-bottom: 12px;
  font-size: 14px;
}

/* layout */
.app { display: grid; grid-template-columns: 220px 1fr; min-height: 100vh; }
.sidebar {
  border-right: 1px solid var(--border);
  background: rgba(12,16,22,.9);
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.brand-sm { display: flex; gap: 10px; align-items: center; padding: 4px 6px 10px; }
.brand-sm .skull { font-size: 22px; }
nav { display: flex; flex-direction: column; gap: 4px; flex: 1; }
.nav-btn {
  text-align: left;
  background: transparent;
  color: var(--muted);
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 10px 12px;
  font-weight: 600;
}
.nav-btn:hover { background: var(--bg3); color: var(--fg); }
.nav-btn.active {
  background: rgba(57,255,136,.08);
  border-color: rgba(57,255,136,.25);
  color: var(--accent);
}
.sidebar-foot { display: grid; gap: 6px; padding-top: 8px; border-top: 1px solid var(--border); }

main { display: flex; flex-direction: column; min-width: 0; }
.panel { display: none; flex-direction: column; height: 100vh; padding: 16px 18px; gap: 12px; }
.panel.active { display: flex; }
.panel-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.panel-head h2 { margin: 0; font-size: 20px; }
.session-meta { display: flex; flex-wrap: wrap; gap: 8px; }
.pill {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 12px;
  color: var(--muted);
}

.chat-log {
  flex: 1;
  overflow: auto;
  background: rgba(10,14,18,.7);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.msg {
  max-width: min(900px, 92%);
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.45;
  font-size: 14px;
}
.msg.user { align-self: flex-end; background: var(--chat-user); border-color: #2a4058; }
.msg.assistant { align-self: flex-start; background: var(--chat-bot); border-color: #1f3a28; }
.msg.tool { align-self: flex-start; background: var(--chat-tool); border-color: #4a3818; color: #ffd9a0; font-family: var(--mono); font-size: 12px; }
.msg.system { align-self: center; background: transparent; color: var(--muted); border-style: dashed; font-size: 12px; }
.msg .role { display: block; font-size: 11px; color: var(--muted); margin-bottom: 4px; text-transform: uppercase; letter-spacing: .08em; }

.composer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: end;
}
.composer textarea { resize: vertical; min-height: 72px; font-family: var(--sans); }
.composer-actions { display: flex; flex-direction: column; gap: 8px; }

.list { display: grid; gap: 8px; overflow: auto; }
.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
}
.card h3 { margin: 0 0 6px; font-size: 14px; }
.card .actions { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 10px;
  align-items: end;
}
.form-grid label { font-size: 12px; color: var(--muted); }
.codeblock {
  background: #070b10;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  overflow: auto;
  font-family: var(--mono);
  font-size: 12px;
  color: #b7c7d9;
  max-height: 40vh;
}

@media (max-width: 860px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { flex-direction: row; flex-wrap: wrap; align-items: center; }
  nav { flex-direction: row; flex-wrap: wrap; }
  .panel { height: auto; min-height: 100vh; }
  .form-grid { grid-template-columns: 1fr; }
  .composer { grid-template-columns: 1fr; }
}