:root {
  --bg: #eef3f7;
  --sidebar: #243746;
  --sidebar-2: #2e4558;
  --sidebar-text: #dce8f1;
  --surface: #ffffff;
  --surface-soft: #f7fafc;
  --line: #d9e3ea;
  --ink: #22313b;
  --muted: #6c7c88;
  --brand: #5d83a3;
  --brand-strong: #486c8a;
  --brand-soft: #eaf2f8;
  --danger: #b66262;
  --danger-soft: #faecec;
  --success: #4f8a6f;
  --success-soft: #e8f4ed;
  --shadow: 0 18px 40px rgba(36, 55, 70, 0.08);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
}

button, input, select, textarea { font: inherit; }

.app-body, .signin-body { min-height: 100vh; }

.admin-layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 24px;
  padding: 24px 18px;
  background: linear-gradient(180deg, var(--sidebar), var(--sidebar-2));
  color: var(--sidebar-text);
}

.brand-block h1,
.content-header h2,
.section-heading h2,
.card-head h3 {
  margin: 0;
  font-family: "Georgia", "Times New Roman", serif;
  font-weight: 600;
}

.brand-block h1 { font-size: 1.7rem; margin-bottom: 8px; }

.eyebrow {
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--muted);
}

.sidebar .eyebrow { color: rgba(220, 232, 241, 0.7); }

.subtle {
  margin: 0;
  line-height: 1.6;
  color: var(--muted);
}

.sidebar .subtle { color: rgba(220, 232, 241, 0.78); }

.sidebar-nav {
  display: grid;
  gap: 8px;
  align-content: start;
}

.nav-link {
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid transparent;
  border-radius: 12px;
  background: transparent;
  color: var(--sidebar-text);
  text-align: left;
  cursor: pointer;
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.08);
}

.nav-link.active {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.08);
}

.sidebar-footer {
  display: grid;
  gap: 10px;
}

.content-shell {
  padding: 28px;
}

.content-header {
  margin-bottom: 18px;
}

.content-header h2 {
  font-size: clamp(1.9rem, 2.8vw, 2.7rem);
  margin-bottom: 8px;
}

.toast {
  position: sticky;
  top: 18px;
  z-index: 10;
  margin-bottom: 18px;
  padding: 14px 18px;
  border-radius: 14px;
  background: var(--success-soft);
  border: 1px solid rgba(79, 138, 111, 0.2);
  color: var(--success);
}

.toast.error {
  background: var(--danger-soft);
  border-color: rgba(182, 98, 98, 0.18);
  color: var(--danger);
}

.section-stack {
  display: grid;
  gap: 22px;
}

.content-section {
  display: grid;
  gap: 18px;
}

.section-heading {
  display: grid;
  gap: 6px;
}

.card-grid {
  display: grid;
  gap: 18px;
}

.card-grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.card {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.card-head {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 14px;
}

.card-head h3 { font-size: 1.35rem; }

.form-grid {
  display: grid;
  gap: 14px;
}

.form-grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.form-grid label {
  display: grid;
  gap: 7px;
}

.form-grid span {
  color: var(--muted);
  font-size: 0.92rem;
}

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

.span-full { grid-column: 1 / -1; }

input, select, textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-soft);
  color: var(--ink);
  outline: none;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 4px rgba(93, 131, 163, 0.12);
}

textarea { resize: vertical; }

.primary-button,
.secondary-button,
.small-button,
.danger-button {
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
}

.primary-button {
  background: var(--brand);
  color: #fff;
}

.primary-button:hover { background: var(--brand-strong); }

.secondary-button,
.small-button {
  background: var(--surface-soft);
  color: var(--ink);
  border-color: var(--line);
}

.secondary-button:hover,
.small-button:hover {
  background: #edf3f7;
}

.danger-button {
  min-height: 38px;
  background: var(--danger-soft);
  color: var(--danger);
  border-color: rgba(182, 98, 98, 0.18);
}

.danger-button:hover { background: #f5e2e2; }

button[disabled] {
  opacity: 0.7;
  cursor: wait;
}

.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.76rem;
  font-weight: 700;
}

.tree-list, .table-shell, .result-panel, .info-block {
  margin-top: 16px;
}

.tree-list {
  display: grid;
  gap: 8px;
}

.tree-node {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-soft);
}

.tree-node strong {
  display: block;
  margin-bottom: 4px;
}

.tree-children {
  display: grid;
  gap: 8px;
  margin-top: 8px;
  padding-left: 16px;
}

.empty-state, .meta {
  color: var(--muted);
}

.table-shell {
  overflow: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 12px 10px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--muted);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.device-name {
  font-weight: 600;
  margin-bottom: 4px;
}

.link-button {
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--brand-strong);
  cursor: pointer;
  font: inherit;
  text-align: left;
}

.link-button:hover {
  text-decoration: underline;
}

.device-open-button {
  font-weight: 600;
}

tr.is-selected td {
  background: rgba(93, 131, 163, 0.08);
}

.table-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.detail-block {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.detail-block:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.detail-block-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.detail-block-head h4 {
  margin: 0 0 4px;
}

.json-value {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  font: inherit;
}

.error-text {
  color: var(--danger);
}

.result-panel,
.info-block {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface-soft);
}

.result-panel strong {
  display: inline-block;
  margin-bottom: 6px;
  font-size: 1.15rem;
  letter-spacing: 0.16em;
}

.signin-shell {
  width: min(980px, calc(100% - 32px));
  margin: 0 auto;
  padding: 52px 0 40px;
}

.summary-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin: 18px 0 24px;
}

.summary-card {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.summary-card strong {
  display: block;
  margin-top: 8px;
}

.device-page-shell {
  width: min(1380px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 40px;
}

.device-page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.link-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
}

.dataset-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}

.tab-button {
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-soft);
  color: var(--ink);
  cursor: pointer;
}

.tab-button.active {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
}

.dataset-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.pager {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 16px;
}

.pager-label {
  color: var(--muted);
  font-size: 0.92rem;
}

.summary-label {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.74rem;
  font-weight: 700;
}

.hidden { display: none !important; }

@media (max-width: 1080px) {
  .admin-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    grid-template-rows: auto auto auto;
  }

  .card-grid-2,
  .form-grid-2 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .content-shell,
  .signin-shell {
    width: min(100% - 20px, 980px);
    padding-top: 18px;
  }

  .content-shell {
    padding: 18px 10px 28px;
  }

  .table-actions,
  .form-actions,
  .device-page-header,
  .dataset-toolbar,
  .pager {
    flex-direction: column;
  }
}