:root {
  color-scheme: dark;

  --bg: #0b0c0f;
  --bg-panel: #12141a;
  --bg-nested: #161a22;

  --border: #232733;
  --border-strong: #2f3545;

  --text: #e7e9ee;
  --muted: #9aa3b2;

  --accent: #d6b27a; /* тёплый коричневый */
  --danger: #c46a6a;

  --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);

  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  font-size: 13px;
  line-height: 1.45;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(
    circle at top,
    #0f1117 0%,
    #0b0c0f 60%
  );
  color: var(--text);
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
  border-radius: 0;
}

/* ================= TOPBAR ================= */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  border-bottom: 1px solid var(--border-strong);
  background: #0f1117;
}

.topbar__brand {
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 600;
  font-size: 11px;
  color: var(--accent);
}

.topbar__actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.topbar__user {
  color: var(--muted);
  font-size: 12px;
}

/* ================= LAYOUT ================= */

.shell {
  padding: 8px 10px 16px;
  max-width: 1180px;
  margin: 0 auto;
}

/* ================= ALERTS ================= */

.alerts {
  display: grid;
  gap: 6px;
  margin-bottom: 8px;
}

.alert {
  border: 1px solid var(--border-strong);
  padding: 6px 8px;
  background: var(--bg-panel);
  font-size: 12px;
}

.alert--success {
  border-color: #3d523d;
  color: #c8dcc8;
}

.alert--error {
  border-color: #5a3535;
  color: #ecc8c8;
}

.alert--warning {
  border-color: #4a4530;
  color: #e8e0c8;
}

/* ================= DASHBOARD ================= */

.dashboard {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.dashboard__toolbar {
  border: 1px solid var(--border);
  background: var(--bg-panel);
  padding: 6px 8px;
  display: grid;
  gap: 6px;
}

/* ================= FORM ================= */

.search-form {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  flex: 1;
  min-width: 200px;
}

.field {
  display: grid;
  gap: 3px;
}

.field--grow {
  flex: 1;
  min-width: 140px;
}

.field--inline {
  flex: 1;
  min-width: 120px;
}

.field__label {
  font-size: 10px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.field__input {
  width: 100%;
  padding: 5px 6px;
  border: 1px solid var(--border-strong);
  background: var(--bg);
  font-size: 12px;
}

.field__input:focus {
  outline: 1px solid var(--accent);
}

/* ================= BUTTONS ================= */

.btn {
  border: 1px solid var(--border-strong);
  background: linear-gradient(180deg, #1a1d25, #141720);
  color: var(--text);
  padding: 6px 10px;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
  font-size: 10px;
}

.btn:hover {
  border-color: var(--accent);
}

.btn--primary {
  border-color: var(--accent);
}

.btn--secondary {
  background: #11131a;
}

.btn--ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--muted);
}

.btn--danger {
  border-color: #4a3030;
  background: #120808;
  color: #e0b0b0;
}

.btn--small {
  padding: 3px 6px;
  font-size: 9px;
}

/* ================= CASCADE GRID ================= */

.cascade {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  border: 1px solid var(--border);
  min-height: 300px;
  background: var(--bg-panel);
  overflow: hidden;
}

/* columns */
.cascade__col--owners {
  background: var(--bg-panel);
}

.cascade__col--members {
  background: #131722;
}

.cascade__col--devices {
  background: #141a26;
}

/* headers */
.cascade__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border-strong);
  background: rgba(0, 0, 0, 0.2);
}

.cascade__head-title {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--muted);
}

.cascade__head-sub {
  font-size: 11px;
  color: var(--muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.cascade__head-action {
  font-size: 10px;
  color: var(--muted);
  text-decoration: underline;
}

/* ================= ROWS ================= */

.cascade__body {
  padding: 4px 6px 10px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.cascade-row {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  background: var(--bg-nested);
  transition: 0.15s ease;
}

.cascade-row:hover {
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.cascade-row--active {
  border-color: var(--accent);
  box-shadow: inset 3px 0 0 var(--accent);
}

.cascade-row--member {
  background: #151a24;
}

.cascade-row__title {
  font-weight: 600;
}

.cascade-row__meta {
  font-size: 11px;
  color: var(--muted);
}

.cascade-row__badge {
  font-size: 10px;
  border: 1px solid #333;
  padding: 1px 5px;
  color: var(--muted);
  align-self: flex-start;
}

/* ================= TAGS ================= */

.cascade-pill {
  font-size: 9px;
  font-weight: 700;
  border: 1px solid var(--accent);
  padding: 0 4px;
  color: var(--accent);
}

/* ================= DETAILS ================= */

.tree-details {
  margin: 4px 0;
  border: 1px solid var(--border);
  background: var(--bg-nested);
}

.tree-details > summary {
  cursor: pointer;
  padding: 6px;
  font-size: 11px;
  color: var(--muted);
}

.tree-details > summary:hover {
  color: var(--text);
}

.tree-details > summary::-webkit-details-marker {
  display: none;
}

.tree-details > summary::before {
  content: "+ ";
  color: #666;
}

.tree-details[open] > summary::before {
  content: "− ";
}

.tree-details__body {
  padding: 6px;
  border-top: 1px solid var(--border);
}

/* ================= DEVICES ================= */

.tree-device-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 3px;
}

.tree-device-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 1px solid var(--border);
  padding: 4px 6px;
  background: #0f121a;
  font-size: 11px;
}

.inline-add {
  display: flex;
  gap: 4px;
  align-items: flex-end;
}

/* ================= MISC ================= */

.muted {
  color: var(--muted);
  font-size: 11px;
}

.banner {
  border: 1px dashed #333;
  padding: 6px 8px;
  font-size: 11px;
  color: var(--muted);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
}