/* Protocol Explorer — standalone. Original "network blueprint" theme.
   Single fixed dark theme (no switcher). Vanilla CSS, no framework. */

:root {
  --bg: #0a0e14;
  --bg-grid: #131a24;
  --panel: #10161f;
  --panel-2: #0d131b;
  --line: #1f2a37;
  --line-2: #2b3a4d;
  --ink: #e7eef6;
  --dim: #7c8ba1;
  --accent: #35d6c4;        /* teal/cyan — the app's signature */
  --accent-2: #38bdf8;
  --amber: #f6b63c;
  --violet: #a78bfa;
  --pink: #f472b6;
  --blue: #60a5fa;
  --green: #34d399;
  --radius: 12px;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "Inter", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(53,214,196,0.06), transparent 60%),
    var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

.app {
  height: 100vh;
  height: 100dvh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 14px;
  padding: 16px clamp(16px, 3vw, 28px);
  max-width: 1360px;
  margin: 0 auto;
}

/* ---------- header ---------- */
.hdr {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { width: 34px; height: 34px; color: var(--accent); }
.brand-txt { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name { font-family: var(--mono); font-weight: 700; font-size: 18px; letter-spacing: -0.01em; }
.brand-sub { font-size: 12px; color: var(--dim); }

.hdr-meta { display: flex; align-items: center; gap: 22px; flex-wrap: wrap; }
.osi { display: flex; align-items: center; gap: 8px; }
.osi-label {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--dim);
}
.osi-chips { display: flex; gap: 4px; }
.osi-chip {
  width: 22px; height: 22px; display: grid; place-items: center;
  font-family: var(--mono); font-size: 11px; color: var(--dim);
  border: 1px solid var(--line); border-radius: 6px;
}
.osi-chip.is-on {
  color: #04140f; background: var(--accent); border-color: var(--accent);
  box-shadow: 0 0 14px rgba(53,214,196,0.5);
}
.prog { display: flex; align-items: center; gap: 10px; }
.prog-bar { width: 120px; height: 6px; border-radius: 99px; background: var(--line); overflow: hidden; }
.prog-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent), var(--accent-2)); transition: width .4s ease; }
.prog-num { font-family: var(--mono); font-size: 11px; color: var(--dim); }

/* ---------- main ---------- */
.main {
  display: grid;
  grid-template-columns: 190px 1fr 290px;
  gap: 14px;
  min-height: 0;
}
.panel, .rail, .stage, .over {
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

/* rail */
.rail { padding: 12px; display: flex; flex-direction: column; gap: 12px; min-height: 0; }
.cats { display: flex; flex-wrap: wrap; gap: 6px; }
.cat {
  font-family: var(--mono); font-size: 11px; cursor: pointer;
  padding: 4px 9px; border-radius: 99px; color: var(--dim);
  background: transparent; border: 1px solid var(--line);
  transition: all .15s;
}
.cat:hover { color: var(--ink); border-color: var(--line-2); }
.cat.is-on { color: #04140f; background: var(--accent); border-color: var(--accent); font-weight: 600; }
.cat .n { opacity: .7; margin-left: 5px; }

.plist { display: flex; flex-direction: column; gap: 4px; overflow-y: auto; min-height: 0; }
.pitem {
  text-align: left; cursor: pointer; padding: 8px 10px;
  border: 1px solid transparent; border-radius: 9px; background: transparent;
  color: var(--ink); transition: all .15s; display: flex; flex-direction: column; gap: 2px;
}
.pitem:hover { border-color: var(--line); background: rgba(255,255,255,0.02); }
.pitem.is-on { border-color: var(--accent); background: rgba(53,214,196,0.08); }
.pitem .pn { font-family: var(--mono); font-weight: 600; font-size: 13px; display: flex; align-items: center; gap: 6px; }
.pitem.is-on .pn { color: var(--accent); }
.pitem .pf { font-size: 10px; color: var(--dim); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dot-done { width: 5px; height: 5px; border-radius: 99px; background: var(--accent); }

/* stage */
.stage { padding: 14px; display: flex; flex-direction: column; gap: 12px; min-height: 0; }
.stage-top { display: flex; align-items: center; gap: 12px; }
.tabs { display: flex; gap: 6px; }
.tab {
  font-family: var(--mono); font-size: 12px; cursor: pointer;
  padding: 6px 12px; border-radius: 8px; color: var(--dim);
  border: 1px solid var(--line); background: transparent; transition: all .15s;
}
.tab:hover { color: var(--ink); }
.tab.is-on { color: #04140f; background: var(--accent); border-color: var(--accent); font-weight: 600; }
.stage-title { margin-left: auto; font-family: var(--mono); font-size: 12px; color: var(--dim); }
.stage-body { flex: 1; min-height: 0; display: flex; }
.canvas { flex: 1; min-height: 280px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel-2); overflow: hidden; }
.canvas svg { width: 100%; height: 100%; display: block; }

.seq { flex: 1; min-height: 0; overflow-y: auto; display: flex; flex-direction: column; gap: 8px; padding-right: 4px; }
.seq-step {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; transition: all .2s;
}
.seq-step.is-on { border-color: var(--accent); background: rgba(53,214,196,0.07); }
.seq-num {
  flex: none; width: 24px; height: 24px; display: grid; place-items: center;
  border-radius: 99px; font-family: var(--mono); font-size: 11px;
  background: var(--line); color: var(--dim);
}
.seq-step.is-on .seq-num { background: var(--accent); color: #04140f; }
.seq-t { font-weight: 600; font-size: 14px; }
.seq-step.is-on .seq-t { color: var(--accent); }
.seq-d { font-size: 12px; color: var(--dim); margin-top: 2px; }

/* overview */
.over { padding: 16px; overflow-y: auto; min-height: 0; }
.over-head { display: flex; align-items: center; gap: 8px; }
.over-name { font-family: var(--mono); font-weight: 700; font-size: 20px; }
.badge {
  margin-left: auto; font-family: var(--mono); font-size: 10px; letter-spacing: .06em;
  color: var(--accent); border: 1px solid var(--accent); border-radius: 99px; padding: 2px 8px;
  display: inline-flex; align-items: center; gap: 5px;
}
.badge .pulse { width: 6px; height: 6px; border-radius: 99px; background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.over-full { color: var(--dim); font-size: 12px; margin: 2px 0 10px; }
.over-sum { font-size: 13px; line-height: 1.55; color: #cdd7e3; }
.over-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 16px; margin-top: 16px; }
.kv .k { font-family: var(--mono); font-size: 10px; letter-spacing: .12em; text-transform: uppercase; color: var(--dim); }
.kv .v { font-family: var(--mono); font-size: 12.5px; color: var(--ink); margin-top: 3px; line-height: 1.4; word-break: break-word; }

/* ---------- flow ---------- */
.flow {
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 12px 14px; display: grid; gap: 10px;
  grid-template-columns: auto 1fr auto; align-items: center;
}
.flow-ctl { display: flex; gap: 8px; }
.btn {
  font-family: var(--mono); font-size: 13px; cursor: pointer;
  padding: 7px 12px; border-radius: 8px; color: var(--ink);
  background: var(--panel); border: 1px solid var(--line-2); transition: all .15s;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn-primary { background: var(--accent); color: #04140f; border-color: var(--accent); font-weight: 700; }
.btn-primary:hover { color: #04140f; filter: brightness(1.08); }
.flow-cur {
  font-family: var(--mono); font-size: 12.5px; display: flex; align-items: center; gap: 10px;
  overflow: hidden; white-space: nowrap;
}
.flow-cur .num { flex: none; width: 18px; height: 18px; display: grid; place-items: center; border-radius: 99px; font-size: 10px; color: #04140f; }
.flow-cur .ip { color: var(--ink); flex: none; }
.flow-cur .pr { flex: none; font-weight: 600; }
.flow-cur .info { color: var(--dim); overflow: hidden; text-overflow: ellipsis; }
.flow-cur .size { color: var(--dim); margin-left: auto; flex: none; }
.flow-legend { display: flex; gap: 12px; grid-column: 1 / -1; flex-wrap: wrap; }
.leg { display: flex; align-items: center; gap: 6px; font-size: 10px; color: var(--dim); font-family: var(--mono); }
.leg i { width: 9px; height: 9px; border-radius: 99px; display: inline-block; }
.flow-pips { display: flex; align-items: center; gap: 6px; grid-column: 1 / -1; flex-wrap: wrap; }
.pip { height: 9px; width: 14px; border-radius: 99px; background: var(--line); cursor: pointer; transition: all .2s; border: none; padding: 0; }
.pip-num { font-family: var(--mono); font-size: 11px; color: var(--dim); margin-left: 6px; }

/* diagram node labels / text rendered in SVG use these via fill */
.n-label { fill: var(--ink); font-family: var(--mono); font-size: 11px; font-weight: 600; }

/* ---------- responsive: stack + scroll on small screens ---------- */
@media (max-width: 960px) {
  .app { height: auto; min-height: 100dvh; }
  .main { grid-template-columns: 1fr; }
  .plist { flex-direction: row; overflow-x: auto; }
  .pitem .pf { display: none; }
  .canvas { min-height: 340px; }
  .flow { grid-template-columns: 1fr; }
}