:root {
  color-scheme: dark;
  --bg: #0b1220;
  --panel: #111a2d;
  --panel-2: #16213a;
  --line: #22314e;
  --text: #e7eefb;
  --muted: #8ea3c3;
  --accent: #4f8cff;
  --accent-2: #2ec4b6;
  --warn: #f59e0b;
  --danger: #ef4444;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.28);
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: linear-gradient(180deg, #08101d 0%, #0b1220 100%); color: var(--text); font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
body { padding: 32px 18px 40px; }
code { color: #b5cdfd; }

.shell { max-width: 1180px; margin: 0 auto; }
.topbar { display: flex; gap: 20px; align-items: end; justify-content: space-between; margin-bottom: 20px; }
.eyebrow { margin: 0 0 8px; color: var(--accent-2); text-transform: uppercase; letter-spacing: 0.14em; font-size: 12px; }
h1, h2, h3, p { margin: 0; }
h1 { font-size: 40px; line-height: 1.1; }
.lede { margin-top: 10px; max-width: 70ch; color: var(--muted); }
.status-badge { padding: 10px 14px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,0.04); color: var(--muted); }
.layout { display: grid; gap: 18px; }
.panel { background: rgba(17, 26, 45, 0.92); border: 1px solid rgba(142, 163, 195, 0.16); box-shadow: var(--shadow); border-radius: 14px; padding: 20px; }
.hidden { display: none; }
.form-grid, .inline-form { display: grid; gap: 12px; }
.form-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: end; max-width: 720px; }
label { display: grid; gap: 8px; color: var(--muted); font-size: 14px; }
input { width: 100%; border-radius: 10px; border: 1px solid var(--line); background: #0b1426; color: var(--text); padding: 12px 14px; outline: none; }
input:focus { border-color: rgba(79, 140, 255, 0.9); box-shadow: 0 0 0 3px rgba(79, 140, 255, 0.18); }
.btn { border: 1px solid transparent; border-radius: 10px; padding: 11px 14px; font-weight: 600; cursor: pointer; color: var(--text); background: rgba(255,255,255,0.06); }
.btn.primary { background: linear-gradient(135deg, var(--accent), #345dff); }
.btn.secondary { background: rgba(46, 196, 182, 0.14); border-color: rgba(46, 196, 182, 0.35); }
.btn.ghost { background: transparent; border-color: var(--line); }
.btn.danger { background: rgba(239, 68, 68, 0.12); border-color: rgba(239, 68, 68, 0.36); color: #fecaca; }
.btn:disabled { cursor: wait; opacity: 0.62; }
.hint, .muted, .card-meta { color: var(--muted); }
.auth-panel { max-width: 780px; }
.cards { display: grid; gap: 14px; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 18px; }
.card { background: rgba(255,255,255,0.03); border: 1px solid var(--line); border-radius: 12px; padding: 16px; display: grid; gap: 8px; min-height: 112px; }
.card-label { color: var(--muted); font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; }
.card strong { font-size: 18px; }
.card-meta { font-size: 13px; }
.toolbar, .section-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.toolbar-actions { display: flex; gap: 10px; }
.device-create { margin-top: 18px; padding: 16px; border: 1px dashed rgba(142, 163, 195, 0.28); border-radius: 12px; background: rgba(255,255,255,0.02); display: flex; gap: 18px; align-items: center; justify-content: space-between; }
.inline-form { grid-template-columns: minmax(0, 1fr) auto; width: min(420px, 100%); }
.list { display: grid; gap: 12px; margin-top: 14px; }
.client { border: 1px solid var(--line); border-radius: 12px; padding: 16px; background: rgba(255,255,255,0.03); display: grid; gap: 12px; }
.client-head { display: flex; justify-content: space-between; gap: 12px; align-items: start; }
.client-name { font-size: 17px; font-weight: 700; }
.client-meta { display: flex; flex-wrap: wrap; gap: 10px; color: var(--muted); font-size: 13px; }
.client-status { display: inline-flex; align-items: center; gap: 8px; border-radius: 999px; padding: 7px 10px; border: 1px solid var(--line); font-size: 13px; font-weight: 700; white-space: nowrap; }
.client-status.is-active { color: #bbf7d0; border-color: rgba(34, 197, 94, 0.34); background: rgba(34, 197, 94, 0.12); }
.client-status.is-inactive { color: #cbd5e1; background: rgba(148, 163, 184, 0.08); }
.status-dot { width: 8px; height: 8px; border-radius: 999px; background: currentColor; box-shadow: 0 0 14px currentColor; }
.connection-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.connection-grid div { min-width: 0; border: 1px solid rgba(142, 163, 195, 0.14); border-radius: 10px; padding: 10px; background: rgba(11, 20, 38, 0.52); }
.connection-grid span { display: block; color: var(--muted); font-size: 12px; margin-bottom: 5px; }
.connection-grid strong { display: block; font-size: 13px; overflow-wrap: anywhere; }
.client-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.link-btn { text-decoration: none; display: inline-flex; align-items: center; justify-content: center; }
.guides { display: grid; gap: 14px; grid-template-columns: repeat(2, minmax(0, 1fr)); margin-top: 14px; }
.guide { border: 1px solid var(--line); border-radius: 12px; padding: 16px; background: rgba(255,255,255,0.03); display: grid; gap: 12px; }
.guide .platform { color: var(--accent-2); font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; }
.guide ol { margin: 0; padding-left: 20px; color: var(--muted); display: grid; gap: 8px; }
.toast { position: fixed; right: 18px; bottom: 18px; background: #09111f; border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; box-shadow: var(--shadow); opacity: 0; transform: translateY(10px); transition: opacity 180ms ease, transform 180ms ease; max-width: 360px; pointer-events: none; }
.toast.show { opacity: 1; transform: translateY(0); }

@media (max-width: 920px) {
  .topbar, .toolbar, .section-head, .device-create { grid-template-columns: 1fr; display: grid; align-items: start; }
  .cards, .guides, .connection-grid { grid-template-columns: 1fr; }
  .form-grid, .inline-form { grid-template-columns: 1fr; width: 100%; max-width: 100%; }
}

@media (max-width: 600px) {
  body { padding: 18px 12px 28px; }
  h1 { font-size: 30px; }
  .panel { padding: 16px; }
  .client-head { display: grid; }
  .toolbar-actions { width: 100%; }
  .toolbar-actions .btn { flex: 1; }
}