:root {
  --bg: #0b0f1a;
  --panel: #121826;
  --panel-2: #0e1420;
  --line: #1f2937;
  --ink: #e5e9f0;
  --dim: #8b97ad;
  --dimmer: #5b6679;
  --accent: #60a5fa;
  --good: #34d399;
  --bad: #f87171;
  --warn: #fbbf24;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.55 ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 1180px; margin: 0 auto; padding: 32px 20px 64px; }

header h1 {
  margin: 0 0 6px;
  font-size: 22px;
  letter-spacing: -0.01em;
}
header h1 code { font-family: var(--mono); color: var(--accent); font-size: 20px; }
header p { margin: 0; color: var(--dim); max-width: 62ch; }
header a { color: var(--accent); }

/* --- mode ------------------------------------------------------------- */
.modes { display: flex; gap: 8px; margin: 24px 0 8px; flex-wrap: wrap; }
.mode {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--dim);
  font: inherit;
  padding: 9px 15px;
  border-radius: 8px;
  cursor: pointer;
  transition: border-color .15s, color .15s, background .15s;
}
.mode:hover { color: var(--ink); border-color: #334155; }
.mode[aria-pressed="true"] { background: #17233a; border-color: var(--accent); color: var(--ink); }
.mode-note { color: var(--dimmer); font-size: 13px; margin: 0 0 22px; min-height: 20px; }

/* --- controls --------------------------------------------------------- */
.controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px 20px;
  padding: 16px 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  margin-bottom: 18px;
}
.control label { display: block; font-size: 12px; color: var(--dim); margin-bottom: 6px; }
.control label b { color: var(--ink); font-variant-numeric: tabular-nums; font-weight: 600; }
.control input[type=range] { width: 100%; accent-color: var(--accent); }
.actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: flex-end; }

button.act {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--ink);
  font: inherit;
  font-size: 13px;
  padding: 8px 13px;
  border-radius: 7px;
  cursor: pointer;
}
button.act:hover { border-color: var(--accent); }
button.act.primary { background: #1d4ed8; border-color: #1d4ed8; }
button.act.primary:hover { background: #2563eb; }

/* --- status ----------------------------------------------------------- */
.status {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 16px; border-radius: 10px; margin-bottom: 18px;
  border: 1px solid var(--line); background: var(--panel);
  font-size: 14px;
}
.status .dot { width: 9px; height: 9px; border-radius: 50%; flex: none; }
.status[data-state="converged"] { border-color: #14532d; background: #0d1c16; }
.status[data-state="converged"] .dot { background: var(--good); }
.status[data-state="settling"] { border-color: #422006; background: #1a1308; }
.status[data-state="settling"] .dot { background: var(--warn); }
.status[data-state="diverged"] { border-color: #4c1d1d; background: #1c0f0f; }
.status[data-state="diverged"] .dot { background: var(--bad); }
.status .detail { color: var(--dim); font-size: 13px; }

/* --- panes ------------------------------------------------------------ */
.server-pane {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 10px; padding: 14px 16px; margin-bottom: 18px;
}
.pane-head {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 10px; font-size: 13px;
}
.pane-head .name { font-weight: 600; }
.pane-head .meta { color: var(--dimmer); font-family: var(--mono); font-size: 12px; margin-left: auto; }

.doc {
  font-family: var(--mono); font-size: 13px; line-height: 1.6;
  background: var(--panel-2); border: 1px solid var(--line); border-radius: 7px;
  padding: 10px 12px; white-space: pre-wrap; word-break: break-word;
  min-height: 42px; color: var(--ink);
}

.clients { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; }
.client {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 10px; padding: 14px 16px;
}
.client[data-offline="true"] { opacity: .72; border-style: dashed; }
.client[data-diverged="true"] { border-color: #7f1d1d; }

.client textarea {
  width: 100%; min-height: 108px; resize: vertical;
  font-family: var(--mono); font-size: 13px; line-height: 1.6;
  background: var(--panel-2); color: var(--ink);
  border: 1px solid var(--line); border-radius: 7px; padding: 10px 12px;
}
.client textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: transparent; }
.client textarea:disabled { color: var(--dimmer); }

.badge {
  font-family: var(--mono); font-size: 11px; padding: 2px 7px;
  border-radius: 999px; border: 1px solid var(--line); color: var(--dim);
}
.badge[data-state="synchronized"] { color: var(--good); border-color: #14532d; }
.badge[data-state="awaiting"] { color: var(--warn); border-color: #422006; }
.badge[data-state="awaiting-with-buffer"] { color: var(--warn); border-color: #422006; }
.badge[data-state="offline"] { color: var(--bad); border-color: #4c1d1d; }

.client-foot {
  display: flex; align-items: center; gap: 8px; margin-top: 9px;
  font-size: 12px; color: var(--dimmer); font-family: var(--mono);
}
.client-foot button { margin-left: auto; }

/* --- log -------------------------------------------------------------- */
.log-head { display: flex; align-items: baseline; gap: 10px; margin: 26px 0 8px; }
.log-head h2 { font-size: 15px; margin: 0; }
.log-head span { color: var(--dimmer); font-size: 13px; }
.log {
  font-family: var(--mono); font-size: 12px; line-height: 1.7;
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  padding: 12px 14px; height: 230px; overflow-y: auto;
}
.log div { white-space: pre; color: var(--dim); }
.log .to-server { color: var(--accent); }
.log .to-client { color: #a78bfa; }
.log .drop { color: var(--bad); }
.log .dupe { color: var(--warn); }
.log .note { color: var(--dimmer); }
.log .good { color: var(--good); }

footer { margin-top: 34px; color: var(--dimmer); font-size: 13px; }
footer a { color: var(--dim); }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

.doc-note {
  margin: 10px 0 0;
  color: var(--dimmer);
  font-size: 12px;
  line-height: 1.6;
  max-width: 74ch;
}

/* --- who wrote what --------------------------------------------------- */
.doc .ch { transition: color .2s; }

/* A caret belonging to somebody else. Two pixels of colour is enough — this
   is a document with three people in it, not a light show. */
.doc .caret {
  display: inline-block;
  width: 2px;
  height: 1.15em;
  vertical-align: -0.22em;
  margin: 0 -1px;
  border-radius: 1px;
  animation: blink 1.1s steps(2, start) infinite;
}
@keyframes blink { 0%, 100% { opacity: 1 } 50% { opacity: .25 } }
@media (prefers-reduced-motion: reduce) {
  .doc .caret { animation: none; }
}

/* Each pane carries its owner's colour, so a name in the document and a name
   on a pane are obviously the same person. */
.client { border-left: 3px solid var(--who, var(--line)); }
.client textarea:focus { outline-color: var(--who, var(--accent)); }