:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --ink: #1d2128;
  --muted: #6b717b;
  --line: #dfe2e7;
  --blue: #1f5fbf;
  --orange: #e07b00;
  --ok: #1b7f3b;
  --warn: #a86400;
  --bad: #b3261e;
  --radius: 8px;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg); color: var(--ink);
  font: 14px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-text-size-adjust: 100%;
}
button, input, select { font: inherit; color: inherit; }
button {
  border: 1px solid #c6cbd3; background: #fff; border-radius: 6px; padding: 6px 12px; cursor: pointer;
}
button:hover { background: #f0f2f5; }
button:disabled { opacity: .5; cursor: default; }
button.primary { background: var(--blue); color: #fff; border-color: var(--blue); }
button.primary:hover { background: #194f9f; }
button.wide { width: 100%; margin: 4px 0; padding: 8px 12px; text-align: left; }
button.big { padding: 12px 16px; font-size: 16px; }
button.recording { background: var(--bad); color: #fff; border-color: var(--bad); }
input[type=number], input[type=text], select {
  border: 1px solid #c6cbd3; border-radius: 5px; padding: 4px 6px; background: #fff; min-width: 0;
}
input[type=number] { width: 72px; }
kbd { font: 11px ui-monospace, monospace; border: 1px solid currentColor; border-radius: 3px; padding: 0 4px; opacity: .7; margin-left: 6px; }
code { font: 12px ui-monospace, monospace; background: #eef0f3; padding: 1px 4px; border-radius: 3px; word-break: break-all; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-top: 8px; }
.ok { color: var(--ok); } .warn { color: var(--warn); } .bad { color: var(--bad); }
.alert { background: #fdecea; color: var(--bad); padding: 10px 12px; border-radius: var(--radius); }

/* ---------------- landing ---------------- */
.landing { max-width: 820px; margin: 0 auto; padding: 32px 16px; }
.landing h1 { margin: 0 0 4px; color: var(--blue); }
.ld-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; margin-top: 20px; }
.ld-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.ld-card h2 { margin: 0 0 6px; font-size: 17px; }
.code-input { width: 100%; font-size: 26px; letter-spacing: 6px; text-align: center; padding: 8px; text-transform: uppercase; }

/* ---------------- phone ---------------- */
body.phone-mode { background: #11151b; color: #e8eaee; }
.phone { max-width: 520px; margin: 0 auto; padding: max(20px, env(safe-area-inset-top)) 16px 32px; text-align: center; }
.ph-role { font-size: 28px; font-weight: 700; margin: 10px 0 2px; }
.ph-role[data-role=lower] { color: #7fb0ff; }
.ph-role[data-role=upper] { color: #ffb45c; }
.ph-code { color: #9aa1ab; margin-bottom: 22px; }
.ph-code b { color: #e8eaee; letter-spacing: 2px; }
button.huge { width: 100%; padding: 22px; font-size: 24px; border-radius: 14px; }
.phone button { background: #222832; border-color: #3a414c; color: #e8eaee; }
.phone button.primary { background: var(--blue); border-color: var(--blue); color: #fff; }
.ph-status { margin: 18px 0; font-size: 17px; min-height: 2.6em; }
.ph-status.ok { color: #6fdc8c; } .ph-status.warn { color: #ffc46b; } .ph-status.bad { color: #ff8a80; }
.ph-info { display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; text-align: left; margin: 0 auto; max-width: 360px; color: #b7bdc6; }
.ph-info dt { color: #7d848f; } .ph-info dd { margin: 0; }
.ph-help { margin-top: 22px; text-align: left; background: #1b2028; border-radius: 10px; padding: 12px 14px; color: #c9ced6; }

/* ---------------- display ---------------- */
.display { display: grid; grid-template-columns: 360px 1fr; height: 100vh; }
.panel { overflow-y: auto; padding: 10px; border-right: 1px solid var(--line); background: var(--bg); }
.brand { font-weight: 700; font-size: 18px; color: var(--blue); padding: 4px 4px 10px; }
.brand span { font-weight: 400; color: var(--muted); font-size: 13px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 12px 12px; margin-bottom: 10px; }
.card h2 { font-size: 13px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); margin: 0 0 8px; }
.card label { display: block; margin: 4px 0; }
.card label.check { display: flex; align-items: center; gap: 6px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 10px; align-items: end; margin-top: 6px; }
.grid2 label select { width: 100%; }
.grid2 .span2 { grid-column: 1 / -1; }
.unit { display: flex; align-items: center; gap: 4px; }
.note { color: var(--muted); font-size: 12.5px; margin: 8px 0 0; }
.session { font-size: 15px; }
.session b { font-size: 22px; letter-spacing: 3px; color: var(--ink); }
.server { font-size: 12.5px; margin: 2px 0 8px; }
.qr-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.qr-row .qr-card { border: 1px solid var(--line); border-radius: 6px; padding: 6px; text-align: center; }
.qr svg { width: 100%; height: auto; display: block; }
.qr-title { font-size: 12px; font-weight: 600; margin-top: 2px; }
.status-list { margin-top: 8px; }
.qr-card-status { display: flex; gap: 6px; font-size: 12.5px; padding: 2px 0; }
.qr-card-status .lbl { font-weight: 600; width: 44px; flex: none; }
.qr-status.muted { color: var(--muted); }
.sim { margin-top: 8px; padding: 8px; background: #f6f7f9; border-radius: 6px; }
.sim input[type=range] { width: 100%; }
details.small { margin-top: 8px; }
.credits { padding: 0 4px; }

.stage { display: flex; flex-direction: column; min-width: 0; padding: 10px 14px; }
.readout { display: flex; gap: 26px; flex-wrap: wrap; align-items: baseline; font-size: 22px; padding: 2px 4px 8px; min-height: 40px; }
.ro-user { color: var(--blue); } .ro-target { color: var(--orange); } .ro-score { color: #333; font-size: 19px; }
.ro-score small { color: var(--muted); font-size: 13px; }
.plotwrap { position: relative; flex: 1; min-height: 300px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.plotwrap canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.banner {
  position: absolute; left: 50%; top: 18px; transform: translateX(-50%);
  background: rgba(40,44,52,.92); color: #fff; font-size: 26px; font-weight: 600;
  padding: 10px 22px; border-radius: 8px; max-width: 90%; text-align: center;
}
.foot { font-size: 12.5px; padding: 6px 4px 0; }

@media (max-width: 860px) {
  .display { grid-template-columns: 1fr; height: auto; }
  .panel { border-right: 0; }
  .plotwrap { min-height: 60vh; }
}