:root {
  --bg: #f4f6f8;
  --card: #ffffff;
  --ink: #16191d;
  --muted: #6b7280;
  --line: #e3e7ec;
  --accent: #0969da;
  --accent-ink: #ffffff;
  --ok: #1a7f37;
  --ok-bg: #e6f4ea;
  --bad: #cf222e;
  --bad-bg: #ffebe9;
  --warn: #9a6700;
  --warn-bg: #fff8c5;
  --radius: 10px;
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 14px/1.5 -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
.hidden { display: none !important; }
.muted { color: var(--muted); }
code { background: #eef1f4; padding: 1px 5px; border-radius: 4px; font-size: 12px; }

/* login */
.login-wrap { display: flex; justify-content: center; padding-top: 12vh; }
.login-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px; width: 320px; display: flex; flex-direction: column; gap: 12px;
  box-shadow: 0 4px 16px rgba(0,0,0,.06);
}
.login-card h1 { margin: 0; font-size: 20px; }
.login-card input {
  padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; font-size: 14px;
}
.login-card button { padding: 10px; border: 0; border-radius: 8px; background: var(--accent); color: var(--accent-ink); font-weight: 600; cursor: pointer; }
.err { color: var(--bad); min-height: 18px; margin: 0; font-size: 13px; }

/* layout */
#app { max-width: 1180px; margin: 0 auto; padding: 16px; display: flex; flex-direction: column; gap: 16px; }
header { display: flex; justify-content: space-between; align-items: center; }
header h1 { margin: 0; font-size: 20px; }

.panel {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 16px;
}
.panel h2 { margin: 0 0 12px; font-size: 15px; }

/* engine card */
.eng { margin-bottom: 16px; }
.eng-head { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 12px; }
.eng-head h2 { margin: 0; font-size: 17px; flex: 1; }
.badge { padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.badge.on { background: var(--ok-bg); color: var(--ok); }
.badge.off { background: var(--bad-bg); color: var(--bad); }
.badge.warn { background: var(--warn-bg); color: var(--warn); }
.badge.dim { background: #eef1f4; color: var(--muted); }

button {
  padding: 7px 14px; border: 1px solid var(--line); border-radius: 8px;
  background: var(--card); color: var(--ink); font-size: 13px; font-weight: 600; cursor: pointer;
}
button:hover { background: #f0f3f6; }
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
button.primary:hover { background: #0a58ca; }
button.danger { background: var(--bad); border-color: var(--bad); color: #fff; }
button.danger:hover { background: #a40e26; }
button.ghost { border-color: transparent; background: transparent; color: var(--muted); }
button.sm { padding: 4px 10px; font-size: 12px; }

/* toggle switch */
.switch { position: relative; display: inline-block; width: 44px; height: 24px; flex: none; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider {
  position: absolute; inset: 0; background: #c6cbd1; border-radius: 999px; transition: .18s; cursor: pointer;
}
.slider:before {
  content: ""; position: absolute; height: 18px; width: 18px; left: 3px; top: 3px;
  background: #fff; border-radius: 50%; transition: .18s; box-shadow: 0 1px 2px rgba(0,0,0,.2);
}
.switch input:checked + .slider { background: var(--ok); }
.switch input:checked + .slider:before { transform: translateX(20px); }
.togrow { display: flex; align-items: center; gap: 8px; font-weight: 600; }

/* sections inside engine */
.eng-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 800px) { .eng-grid { grid-template-columns: 1fr; } }
.sub { border: 1px solid var(--line); border-radius: 8px; padding: 12px; }
.sub h3 { margin: 0 0 8px; font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: .4px; }

/* sessions */
.sess-row { display: flex; gap: 6px; align-items: center; margin-bottom: 6px; }
.sess-row input[type=time] { padding: 5px 8px; border: 1px solid var(--line); border-radius: 6px; font-size: 13px; background: #fff; }
.sess-hint { font-size: 12px; color: var(--muted); margin: 4px 0 0; }

/* symbol cards */
.syms { display: grid; grid-template-columns: repeat(auto-fill, minmax(330px, 1fr)); gap: 12px; }
.sym { border: 1px solid var(--line); border-radius: 8px; padding: 12px; }
.sym-head { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.sym-head b { font-size: 15px; flex: 1; }
.sym-stats { display: flex; flex-wrap: wrap; gap: 6px 14px; font-size: 13px; margin-bottom: 8px; }
.sym-stats span b { font-weight: 600; }

/* params form */
details.tune { border-top: 1px dashed var(--line); padding-top: 8px; margin-top: 4px; }
details.tune summary { cursor: pointer; font-weight: 600; font-size: 13px; color: var(--accent); }
.pgrid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 10px; }
@media (max-width: 480px) { .pgrid { grid-template-columns: 1fr; } }
.pfield label { display: block; font-size: 11px; color: var(--muted); margin-bottom: 2px; }
.pfield input {
  width: 100%; padding: 6px 8px; border: 1px solid var(--line); border-radius: 6px;
  font-size: 13px; background: #fff;
}
.pfield input.changed { border-color: var(--accent); background: #f0f6ff; }
.pfield .hint { font-size: 10px; color: var(--muted); }
.pactions { display: flex; gap: 8px; margin-top: 10px; }

/* logs */
.tabs { display: flex; gap: 6px; margin-bottom: 8px; }
.tabs button.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.logbox {
  background: #f7f8fa; border: 1px solid var(--line); border-radius: 8px;
  padding: 10px; font: 11px/1.45 ui-monospace, "Cascadia Code", Menlo, monospace;
  max-height: 320px; overflow: auto; white-space: pre-wrap; word-break: break-all; margin: 0;
}
.logbox.small { max-height: 200px; font-size: 10px; }

footer { text-align: center; color: var(--muted); font-size: 12px; padding: 8px; }

/* toast */
.toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
  background: var(--ink); color: #fff; padding: 10px 18px; border-radius: 8px;
  font-size: 13px; z-index: 50; box-shadow: 0 4px 14px rgba(0,0,0,.25);
}
.toast.err { background: var(--bad); }

/* modal */
.modal-bg { position: fixed; inset: 0; background: rgba(0,0,0,.35); display: flex; align-items: center; justify-content: center; z-index: 40; }
.modal { background: var(--card); border-radius: 10px; padding: 20px; width: 380px; }
.modal h3 { margin: 0 0 8px; }
.modal p { font-size: 13px; }
.modal input { width: 100%; padding: 8px; border: 1px solid var(--line); border-radius: 6px; margin: 8px 0; font-size: 14px; }
.modal .pactions { justify-content: flex-end; }