:root {
  --bg: #0e1117;
  --panel: #161b22;
  --panel-2: #1c2230;
  --border: #2a3140;
  --text: #e6edf3;
  --muted: #8b949e;
  --green: #2ea043;
  --green-glow: rgba(46, 160, 67, 0.55);
  --red: #f85149;
  --red-glow: rgba(248, 81, 73, 0.55);
  --amber: #d29922;
  --accent: #388bfd;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

.view { min-height: 100vh; }
.hidden { display: none !important; }

/* ---------- Login ---------- */
#login-view { display: flex; align-items: center; justify-content: center; padding: 1.5rem; }
.login-card {
  width: 100%; max-width: 340px;
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 14px; padding: 2rem;
  display: flex; flex-direction: column; gap: 0.9rem;
}
.login-card h1 { margin: 0; font-size: 1.4rem; }
.login-card .sub { margin: -0.5rem 0 0.5rem; color: var(--muted); }
.login-card label { display: flex; flex-direction: column; gap: 0.35rem; font-size: 0.85rem; color: var(--muted); }
.login-card input {
  padding: 0.6rem 0.7rem; border-radius: 8px; border: 1px solid var(--border);
  background: var(--panel-2); color: var(--text); font-size: 1rem;
}
.login-card input:focus { outline: 2px solid var(--accent); border-color: var(--accent); }
button {
  padding: 0.65rem 1rem; border-radius: 8px; border: none;
  background: var(--accent); color: #fff; font-size: 0.95rem; font-weight: 600; cursor: pointer;
}
button:hover { filter: brightness(1.08); }
button.ghost { background: transparent; border: 1px solid var(--border); color: var(--muted); font-weight: 500; }
.error { color: var(--red); font-size: 0.85rem; margin: 0; }

/* ---------- Dashboard ---------- */
#dash-view { max-width: 940px; margin: 0 auto; padding: 1.5rem; }
.topbar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.5rem; }
.topbar h1 { margin: 0; font-size: 1.3rem; }
.updated { color: var(--muted); font-size: 0.8rem; }

/* ---------- Topologie ---------- */
.topo {
  display: grid;
  grid-template-columns: 1fr minmax(170px, 1.15fr) 1fr;
  gap: 1.3rem 0.6rem;
  align-items: center;
}
.col-head {
  font-size: 1rem; font-weight: 700; padding-bottom: 0.2rem;
  border-bottom: 1px solid var(--border);
}
.col-head.a { text-align: right; }
.col-head.b { text-align: left; }
.col-head.mid { text-align: center; color: var(--muted); font-weight: 600; font-size: 0.75rem;
  text-transform: uppercase; letter-spacing: 0.06em; border-bottom-color: transparent; }

/* Endpunkt-Karte (Client A links / Client B rechts) */
.endpoint {
  display: flex; align-items: center; gap: 0.7rem;
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 12px; padding: 0.75rem 0.9rem;
}
.endpoint.left { flex-direction: row-reverse; text-align: right; }
.endpoint.right { text-align: left; }
.ep-body { display: flex; flex-direction: column; }
.ep-ping { font-size: 1.15rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.ep-ping span { font-size: 0.75rem; font-weight: 400; color: var(--muted); }
.ep-ping.off { color: var(--red); font-size: 0.95rem; }
.ep-addr { color: var(--muted); font-size: 0.75rem; }

.led {
  width: 16px; height: 16px; border-radius: 50%; flex-shrink: 0; background: var(--muted);
  transition: background .3s, box-shadow .3s;
}
.led.up   { background: var(--green); box-shadow: 0 0 10px 2px var(--green-glow); }
.led.down { background: var(--red);   box-shadow: 0 0 10px 2px var(--red-glow); }

/* Mittlerer Tunnel-Link mit Verbindungslinie */
.link { position: relative; display: flex; justify-content: center; }
.link::before {
  content: ""; position: absolute; top: 50%; left: -0.3rem; right: -0.3rem;
  height: 2px; transform: translateY(-50%);
  background: var(--border);
}
.link.up::before      { background: var(--green); box-shadow: 0 0 6px var(--green-glow); }
.link.down::before    { background: var(--red); }
.link.partial::before { background: var(--amber); }

.link-badge {
  position: relative; z-index: 1; text-align: center;
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 10px; padding: 0.55rem 0.8rem; min-width: 130px;
}
.link-name { font-weight: 700; font-size: 0.9rem; }
.link-iface { color: var(--muted); font-size: 0.7rem; margin-bottom: 0.35rem; }
.link-rates { display: flex; justify-content: center; gap: 0.7rem; font-variant-numeric: tabular-nums; }
.rate { font-size: 0.9rem; white-space: nowrap; }
.rate .arrow { font-weight: 700; }
.rate.down .arrow { color: var(--green); }
.rate.up .arrow { color: var(--accent); }
.rate-unit { color: var(--muted); font-size: 0.68rem; margin-top: 0.15rem; }

@media (max-width: 560px) {
  .topo { grid-template-columns: 1fr; gap: 0.5rem; }
  .col-head { display: none; }
  .endpoint.left { flex-direction: row; text-align: left; }
  .link { margin: 0.2rem 0; }
  .link::before { display: none; }
}