:root {
  --bg: #f3f4f6;
  --card: #ffffff;
  --ink: #1f2937;
  --muted: #6b7280;
  --line: #e5e7eb;
  --primary: #2563eb;
  --primary-ink: #ffffff;
  --ok: #16a34a;
  --warn: #b45309;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(0,0,0,.04), 0 8px 24px rgba(0,0,0,.05);
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body {
  margin: 0;
  font: 14px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
}
h1,h2 { margin: 0; }
button, input, select { font: inherit; }

/* layout */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; padding: 12px 20px;
  background: var(--card); border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10;
}
.brand { font-weight: 700; font-size: 16px; display: flex; align-items: center; gap: 8px; }
.logo { color: var(--primary); }
.topbar-right { display: flex; align-items: center; gap: 8px; }
.wrap { max-width: 940px; margin: 20px auto; padding: 0 20px; display: grid; gap: 16px; }

.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow);
}
.card-inset { background: #fafafa; border: 1px solid var(--line); border-radius: 12px; padding: 14px; }
.center { text-align: center; display: grid; gap: 12px; justify-items: center; }

/* buttons */
.btn {
  border: 1px solid var(--line); background: var(--card); color: var(--ink);
  padding: 8px 14px; border-radius: 10px; cursor: pointer; font-weight: 600;
  display: inline-flex; align-items: center; gap: 6px; text-decoration: none;
  transition: background .15s, border-color .15s, opacity .15s;
}
.btn:hover { background: #f9fafb; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: var(--primary-ink); }
.btn-primary:hover { background: #1d4ed8; }
.btn-ghost { background: transparent; }
.btn-block { width: 100%; justify-content: center; }
.btn-danger { color: #b91c1c; border-color: #fecaca; }
.btn-danger:hover { background: #fef2f2; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

.badge { font-size: 11px; padding: 2px 7px; border-radius: 999px; font-weight: 700; }
.badge-warn { background: #fef3c7; color: var(--warn); }

.actions-row { display: flex; flex-wrap: wrap; gap: 10px; }

/* monitor grid */
.grid.monitor { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.stat {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 16px; display: flex; gap: 12px; align-items: center; box-shadow: var(--shadow);
}
.stat-ico {
  width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center;
  font-size: 18px; flex: none;
}
.ico-green { background: #dcfce7; } .ico-blue { background: #dbeafe; }
.ico-amber { background: #fef3c7; } .ico-violet { background: #ede9fe; }
.ico-cyan { background: #cffafe; } .ico-pink { background: #fce7f3; }
.stat-label { font-size: 11px; letter-spacing: .04em; color: var(--muted); font-weight: 700; }
.stat-value { font-size: 15px; font-weight: 700; margin-top: 2px; word-break: break-all; }
.stat-value.ok { color: var(--ok); }
.stat-value.off { color: var(--muted); }

/* tabs */
.tabs { display: flex; gap: 6px; border-bottom: 1px solid var(--line); margin: -4px -4px 14px; flex-wrap: wrap; }
.tab {
  border: none; background: none; padding: 10px 12px; cursor: pointer;
  color: var(--muted); font-weight: 600; border-bottom: 2px solid transparent;
}
.tab.active { color: var(--primary); border-bottom-color: var(--primary); }

.config-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.config-head-btns { display: flex; gap: 8px; }
.config-split { display: grid; grid-template-columns: 200px 1fr; gap: 16px; align-items: start; }
.qr-box { border: 1px solid var(--line); border-radius: 12px; padding: 10px; background: #fff; }
.qr-box img { display: block; width: 100%; }
.config-text {
  margin: 0; padding: 14px; background: #f9fafb; border: 1px solid var(--line);
  border-radius: 12px; font: 12.5px/1.6 ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  white-space: pre-wrap; word-break: break-all; overflow-x: auto; max-height: 340px;
}

/* port settings */
.section-title { font-size: 15px; margin-bottom: 4px; }
.hint { color: var(--muted); font-size: 13px; margin: 6px 0 14px; }
.port-list { display: grid; gap: 10px; margin-bottom: 14px; }
.port-row {
  display: grid; grid-template-columns: 1fr auto 150px auto auto; gap: 14px;
  align-items: center; padding: 12px 14px; border: 1px solid var(--line);
  border-radius: 12px; background: #fafafa;
}
.port-row .addr { font-family: ui-monospace, Menlo, Consolas, monospace; font-weight: 700; font-size: 14px; margin-top: 2px; }
.port-row .sub { color: var(--muted); font-size: 11px; letter-spacing: .02em; }
.port-row .arrow { color: var(--muted); font-size: 18px; }
.port-row input[type=number] { padding: 7px 9px; border: 1px solid var(--line); border-radius: 8px; width: 100%; margin-top: 3px; }
.port-row .pr-on { display: flex; align-items: center; gap: 5px; font-size: 12px; color: var(--muted); }
.port-row .pr-btns { display: flex; gap: 6px; }
.port-row.disabled { opacity: .55; }
.pill { font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 999px; background: #e0e7ff; color: #3730a3; text-transform: uppercase; }

.port-add-grid {
  display: grid; grid-template-columns: repeat(5, 1fr) auto; gap: 10px; align-items: end;
}
.port-add-grid label, .gate label { display: grid; gap: 4px; font-size: 12px; font-weight: 600; color: var(--muted); }
.port-add-grid input, .port-add-grid select, .gate input {
  padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; color: var(--ink);
}

/* toast */
.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%);
  background: #111827; color: #fff; padding: 10px 16px; border-radius: 10px;
  box-shadow: var(--shadow); z-index: 50;
}
.toast.err { background: #b91c1c; }

/* gate */
.gate { min-height: 100vh; display: grid; place-items: center; padding: 20px; }
.gate-card { width: 100%; max-width: 360px; display: grid; gap: 12px; }
.logo-lg { font-size: 20px; text-align: center; color: var(--primary); }
.gate-sub { text-align: center; color: var(--muted); margin: -4px 0 4px; }
.gate-err { color: #b91c1c; text-align: center; margin: 0; }

@media (max-width: 820px) {
  .grid.monitor { grid-template-columns: 1fr 1fr; }
  .config-split { grid-template-columns: 1fr; }
  .port-row, .port-add-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .grid.monitor { grid-template-columns: 1fr; }
  .port-row, .port-add-grid { grid-template-columns: 1fr; }
}