:root {
  --bg: #0b2027;
  --panel: #0f2c33;
  --border: #1c3438;
  --accent: #4fd1c5;
  --amber: #e0a458;
  --text: #eaf4f4;
  --muted: #8a9ba8;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Consolas, monospace;
  --sans: -apple-system, "Segoe UI", ui-sans-serif, system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.5;
}

/* ---- gate / login page ---- */
body.gate {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.gate-panel {
  border: 1px solid var(--border);
  padding: 2.5rem;
  width: min(90vw, 400px);
  text-align: left;
}
.gate-mark { color: var(--accent); font-size: 1.4rem; margin-bottom: 1rem; }
.gate-panel h1 { font-size: 1.3rem; margin: 0 0 0.6rem; }
.gate-panel p { color: var(--muted); font-size: 0.9rem; margin: 0 0 1.4rem; }
.gate-panel code { font-family: var(--mono); background: var(--panel); padding: 0.1rem 0.3rem; }
.gate-panel input {
  width: 100%; padding: 0.6rem 0.7rem; background: var(--bg); border: 1px solid var(--border);
  color: var(--text); font-family: var(--mono); margin-bottom: 0.8rem;
}
.gate-panel button {
  width: 100%; padding: 0.6rem; background: var(--accent); border: none; color: #06201d;
  font-weight: 600; cursor: pointer;
}
.gate-alt { font-size: 0.8rem; color: var(--muted); margin: 1rem 0 0; }
.gate-alt a { color: var(--accent); }

/* ---- topbar ---- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 1.75rem; border-bottom: 1px solid var(--border);
}
.topbar-left { display: flex; align-items: center; gap: 0.75rem; }
.mark { color: var(--accent); font-size: 1.3rem; }
.channel-name { font-size: 1.05rem; font-weight: 600; }
.channel-sub { font-size: 0.78rem; color: var(--muted); }
.topbar-right { display: flex; align-items: center; gap: 0.5rem; font-size: 0.82rem; color: var(--muted); font-family: var(--mono); }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); display: inline-block; }
.status-dot.ok { background: var(--accent); }
.status-dot.err { background: #c0392b; }

/* ---- tabs ---- */
.tabs {
  display: flex; gap: 0.25rem; padding: 0 1.75rem; border-bottom: 1px solid var(--border);
  max-width: 1200px; margin: 0 auto;
}
.tab-btn {
  background: transparent; border: none; border-bottom: 2px solid transparent;
  color: var(--muted); font-family: var(--sans); font-size: 0.88rem; font-weight: 500;
  padding: 0.85rem 1rem; cursor: pointer; margin-bottom: -1px;
}
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }
.tab-btn:hover:not(.active) { color: var(--text); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

main { padding: 1.75rem; max-width: 1200px; margin: 0 auto; }

/* ---- readouts ---- */
.readouts {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 1px;
  background: var(--border); border: 1px solid var(--border); margin-bottom: 2rem;
}
.readout { background: var(--panel); padding: 1.1rem 1.2rem; position: relative; }
.readout-label { font-size: 0.72rem; color: var(--muted); text-transform: none; margin-bottom: 0.5rem; }
.readout-value { font-family: var(--mono); font-size: 2rem; font-weight: 600; color: var(--accent); }
.readout-time { font-size: 0.7rem; color: var(--muted); font-family: var(--mono); margin-top: 0.4rem; }

/* ---- chart section ---- */
.chart-section, .table-section { margin-bottom: 2rem; }
.chart-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 0.8rem; }
.chart-header h2 { font-size: 0.95rem; font-weight: 600; margin: 0; color: var(--text); }
.chart-header a { color: var(--accent); text-decoration: none; font-size: 0.85rem; font-family: var(--mono); }
.chart-header a:hover { text-decoration: underline; }

.range-controls { display: flex; gap: 0.4rem; }
.range-btn {
  background: transparent; border: 1px solid var(--border); color: var(--muted);
  font-family: var(--mono); font-size: 0.75rem; padding: 0.3rem 0.65rem; cursor: pointer;
}
.range-btn.active { border-color: var(--accent); color: var(--accent); }

#chart { background: var(--panel); border: 1px solid var(--border); padding: 1rem; }

/* ---- table ---- */
.table-wrap { border: 1px solid var(--border); max-height: 420px; overflow-y: auto; }
table { width: 100%; border-collapse: collapse; font-family: var(--mono); font-size: 0.8rem; }
thead th {
  position: sticky; top: 0; background: var(--panel); text-align: left; padding: 0.6rem 0.8rem;
  border-bottom: 1px solid var(--border); color: var(--muted); font-weight: 500;
}
tbody td { padding: 0.5rem 0.8rem; border-bottom: 1px solid var(--border); color: var(--text); }
tbody tr:hover { background: var(--panel); }

footer { text-align: center; color: var(--muted); font-size: 0.75rem; padding: 1.5rem; font-family: var(--mono); }

/* ---- channel management page ---- */
.banner {
  border: 1px solid var(--accent); background: var(--panel); color: var(--text);
  padding: 0.9rem 1.2rem; margin-bottom: 1.5rem; font-size: 0.9rem;
}
.channels-list h2, .create-section h2 { font-size: 1rem; font-weight: 600; margin: 0 0 1rem; }
.channels-list { margin-bottom: 2.5rem; }

.channel-card {
  border: 1px solid var(--border); background: var(--panel); padding: 1.1rem 1.3rem; margin-bottom: 0.8rem;
}
.channel-card.highlight { border-color: var(--accent); }
.channel-card-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 0.7rem; }
.channel-card-title { font-weight: 600; font-size: 0.95rem; }
.channel-card-link { color: var(--accent); text-decoration: none; font-size: 0.82rem; font-family: var(--mono); }
.channel-card-link:hover { text-decoration: underline; }
.channel-card-keys { display: flex; gap: 2rem; margin-bottom: 0.7rem; flex-wrap: wrap; }
.channel-card-keys code, .channel-card-url code {
  font-family: var(--mono); background: var(--bg); border: 1px solid var(--border);
  padding: 0.15rem 0.5rem; color: var(--accent); font-size: 0.82rem;
}
.key-label { display: block; font-size: 0.7rem; color: var(--muted); margin-bottom: 0.2rem; }
.channel-card-fields { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-bottom: 0.7rem; }
.field-chip {
  font-size: 0.72rem; color: var(--muted); border: 1px solid var(--border);
  padding: 0.15rem 0.55rem;
}
.channel-card-url code { color: var(--amber); }

.channel-card-actions { display: flex; align-items: center; gap: 1rem; }
.btn-link {
  background: none; border: none; color: var(--accent); font-family: var(--mono);
  font-size: 0.82rem; cursor: pointer; padding: 0; text-decoration: none;
}
.btn-link:hover { text-decoration: underline; }
.btn-danger { color: #e07a7a; }

.banner-warn { border-color: var(--amber); }

.edit-form {
  margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--border);
}
.edit-form label {
  display: flex; flex-direction: column; gap: 0.3rem; font-size: 0.78rem; color: var(--muted);
  margin-bottom: 0.8rem;
}
.edit-form input {
  background: var(--bg); border: 1px solid var(--border); color: var(--text);
  padding: 0.5rem 0.65rem; font-family: var(--sans); font-size: 0.88rem;
}
.edit-form button[type="submit"] {
  background: var(--accent); border: none; color: #06201d; font-weight: 600;
  padding: 0.55rem 1.2rem; cursor: pointer; margin-top: 0.2rem;
}
.btn-secondary {
  background: transparent; border: 1px solid var(--border); color: var(--muted);
  padding: 0.55rem 1.2rem; cursor: pointer; margin-top: 0.2rem; margin-left: 0.6rem;
}
.edit-note { font-size: 0.72rem; color: var(--muted); margin: 0.6rem 0 0; }

.create-section { border: 1px solid var(--border); padding: 1.3rem 1.5rem; }
.create-form label {
  display: flex; flex-direction: column; gap: 0.3rem; font-size: 0.78rem; color: var(--muted);
  margin-bottom: 1rem;
}
.create-form input {
  background: var(--bg); border: 1px solid var(--border); color: var(--text);
  padding: 0.55rem 0.7rem; font-family: var(--sans); font-size: 0.9rem;
}
.field-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 0 1rem; }
.create-form button {
  background: var(--accent); border: none; color: #06201d; font-weight: 600;
  padding: 0.6rem 1.4rem; cursor: pointer; margin-top: 0.4rem;
}

@media (max-width: 640px) {
  .readouts { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }
  .readout-value { font-size: 1.5rem; }
}