:root {
  --bg: #0f1115;
  --surface: #1a1d24;
  --surface-2: #22262f;
  --border: #2c3038;
  --text: #eef0f3;
  --text-dim: #9aa1ac;
  --accent: #f5871f;
  --accent-dim: #7a4410;
  --green: #29b473;
  --red: #e05263;
  --radius: 16px;
  --radius-sm: 10px;
}

:root[data-theme="light"] {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --surface-2: #eef0f3;
  --border: #dfe2e7;
  --text: #14161a;
  --text-dim: #666d78;
  --accent: #e57614;
  --accent-dim: #fbe3c8;
  --green: #1f9d63;
  --red: #d1435a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  transition: background .15s ease, color .15s ease;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

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

.app-shell { display: flex; min-height: 100vh; }

.sidebar {
  width: 220px;
  flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 20px 14px;
  position: sticky;
  top: 0;
  height: 100vh;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 16px;
  padding: 6px 10px 22px;
}
.brand-icon { font-size: 20px; }

.sidebar nav { display: flex; flex-direction: column; gap: 4px; flex: 1; }
.sidebar nav a {
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  font-size: 14px;
  font-weight: 500;
}
.sidebar nav a:hover { background: var(--surface-2); color: var(--text); }
.sidebar nav a.active { background: var(--accent-dim); color: var(--accent); }

.sidebar-footer {
  border-top: 1px solid var(--border);
  padding-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
}
.username { color: var(--text-dim); padding: 0 12px; }
.logout-link { padding: 8px 12px; border-radius: var(--radius-sm); color: var(--text-dim); }
.logout-link:hover { background: var(--surface-2); color: var(--red); }

.theme-toggle {
  display: flex; align-items: center; gap: 8px;
  width: 100%; padding: 8px 12px; margin-bottom: 4px;
  background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-sm);
  color: var(--text); font-size: 13px; font-family: inherit; cursor: pointer; text-align: left;
}
.theme-toggle:hover { border-color: var(--accent); }
.theme-toggle .icon-light { display: none; }
:root[data-theme="light"] .theme-toggle .icon-dark { display: none; }
:root[data-theme="light"] .theme-toggle .icon-light { display: inline; }
.theme-toggle::after {
  content: "Dunkel"; margin-left: auto; color: var(--text-dim); font-size: 12px;
}
:root[data-theme="light"] .theme-toggle::after { content: "Hell"; }

.content {
  flex: 1;
  padding: 28px 32px 60px;
  max-width: 1100px;
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 22px;
  flex-wrap: wrap;
  gap: 12px;
}
.page-header h1 { font-size: 22px; margin: 0; }
.page-sub { color: var(--text-dim); font-size: 14px; margin-top: 4px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent);
  color: #1a1000;
  font-weight: 600;
  font-size: 14px;
  border: none;
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  cursor: pointer;
}
.btn:hover { filter: brightness(1.08); }
.btn.secondary {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn.danger { background: var(--red); color: white; }
.btn.small { padding: 6px 10px; font-size: 12px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.device-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.device-card {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--surface);
  display: flex;
  flex-direction: column;
}
.device-card-head {
  padding: 16px 18px;
  color: #1a1000;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.device-card-icon { font-size: 22px; margin-bottom: 8px; }
.device-card-row { display: flex; justify-content: space-between; font-size: 13px; opacity: .85; }
.device-card-row b { font-size: 15px; opacity: 1; }
.device-card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: rgba(0,0,0,.35);
  font-size: 13px;
  font-weight: 600;
}
.device-card-foot .actions { display: flex; gap: 14px; }
.device-card-foot a { opacity: .9; }
.device-card-foot a:hover { opacity: 1; }

.add-device-card {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  min-height: 120px;
  color: var(--text-dim);
  position: relative;
}
.add-device-card summary {
  height: 100%;
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  cursor: pointer;
  list-style: none;
}
.add-device-card summary::-webkit-details-marker { display: none; }
.add-device-card:hover, .add-device-card[open] { border-color: var(--accent); color: var(--accent); }
.add-device-menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  z-index: 5;
}
.add-device-menu a {
  display: block;
  padding: 10px 14px;
  font-size: 13px;
  color: var(--text);
}
.add-device-menu a:hover { background: var(--surface-2); color: var(--accent); }

.virtual-badge {
  font-size: 12px;
  font-weight: 700;
  background: rgba(0,0,0,.35);
  border-radius: 999px;
  padding: 1px 6px;
  margin-left: 6px;
  vertical-align: middle;
}

.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-dim);
}
.empty-state .icon { font-size: 40px; margin-bottom: 12px; }

form.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 18px;
}
form.form-grid .full { grid-column: 1 / -1; }
.field label {
  display: block;
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 6px;
}
.field input, .field select, .field textarea {
  width: 100%;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
}
.field textarea { resize: vertical; min-height: 60px; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.color-swatches { display: flex; gap: 8px; flex-wrap: wrap; }
.swatch {
  width: 30px; height: 30px; border-radius: 50%;
  cursor: pointer; border: 2px solid transparent;
}
.swatch.selected { border-color: white; }

.preset-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(90px, 1fr)); gap: 10px; }
.preset-tile {
  border-radius: var(--radius-sm); padding: 12px 8px; cursor: pointer;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  color: #1a1000; border: 2px solid transparent;
}
.preset-tile:hover { border-color: rgba(255,255,255,.6); }
.preset-tile.selected { border-color: var(--text); }
.preset-icon { font-size: 20px; }
.preset-label { font-size: 11px; font-weight: 600; }

.icon-options { display: flex; gap: 8px; flex-wrap: wrap; }
.icon-option {
  width: 40px; height: 40px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  background: var(--surface-2); border: 1px solid var(--border);
  cursor: pointer; font-size: 18px;
}
.icon-option.selected { border-color: var(--accent); background: var(--accent-dim); }

.form-actions { grid-column: 1 / -1; display: flex; gap: 10px; margin-top: 6px; }

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 20px; }
.tab {
  padding: 10px 16px; font-size: 14px; color: var(--text-dim);
  cursor: pointer; border-bottom: 2px solid transparent;
}
.tab.active { color: var(--accent); border-color: var(--accent); }

.subnav { display: flex; gap: 8px; margin-bottom: 20px; flex-wrap: wrap; }
.subnav a {
  padding: 8px 14px; border-radius: 999px; font-size: 13px;
  background: var(--surface-2); border: 1px solid var(--border); color: var(--text-dim);
}
.subnav a.active { background: var(--accent-dim); color: var(--accent); border-color: var(--accent-dim); }

.chart-card { margin-bottom: 18px; }
.chart-card-head {
  display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px;
}
.chart-card-head h3 { font-size: 15px; margin: 0; }
.period-switch { display: flex; gap: 4px; background: var(--surface-2); border-radius: 999px; padding: 3px; }
.period-switch button {
  border: none; background: transparent; color: var(--text-dim);
  font-size: 12px; padding: 6px 10px; border-radius: 999px; cursor: pointer;
}
.period-switch button.active { background: var(--accent); color: #1a1000; font-weight: 600; }

canvas.chart-canvas { width: 100%; height: 220px; display: block; cursor: crosshair; }

.chart-tooltip {
  position: fixed;
  display: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font-size: 12px;
  color: var(--text);
  pointer-events: none;
  z-index: 1000;
  box-shadow: 0 4px 12px rgba(0,0,0,.25);
  white-space: nowrap;
}
.chart-tooltip-label { color: var(--text-dim); margin-bottom: 2px; }

table.data-table { width: 100%; border-collapse: collapse; font-size: 14px; }
table.data-table th, table.data-table td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); }
table.data-table th { color: var(--text-dim); font-weight: 500; font-size: 12px; text-transform: uppercase; letter-spacing: .04em; }
table.data-table tr:last-child td { border-bottom: none; }
table.data-table .num { text-align: right; font-variant-numeric: tabular-nums; }

.meter-block { margin-bottom: 24px; }
.meter-block-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 10px; }
.meter-block-head h3 { margin: 0; font-size: 15px; }
.meter-block-head span { color: var(--text-dim); font-size: 13px; }

.mode-toggle { display: flex; gap: 4px; background: var(--surface-2); border-radius: 999px; padding: 3px; }
.mode-toggle button {
  border: none; background: transparent; color: var(--text-dim);
  font-size: 13px; padding: 8px 14px; border-radius: 999px; cursor: pointer; font-weight: 600;
}
.mode-toggle button.active { background: var(--accent); color: #1a1000; }

.auth-screen {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: radial-gradient(circle at top, var(--surface-2), var(--bg));
}
.auth-box {
  width: 340px; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px;
}
.auth-box h1 { font-size: 20px; margin: 0 0 4px; text-align: center; }
.auth-box p.sub { text-align: center; color: var(--text-dim); font-size: 13px; margin: 0 0 24px; }
.auth-box .field { margin-bottom: 14px; }
.auth-box .btn { width: 100%; justify-content: center; margin-top: 6px; }
.auth-error { background: rgba(224,82,99,.12); color: var(--red); padding: 10px 12px; border-radius: var(--radius-sm); font-size: 13px; margin-bottom: 14px; }
.auth-switch { text-align: center; margin-top: 16px; font-size: 13px; color: var(--text-dim); }
.auth-switch a { color: var(--accent); }

.theme-toggle-fab {
  position: fixed; top: 20px; right: 20px;
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--surface); border: 1px solid var(--border);
  font-size: 16px; cursor: pointer; display: flex; align-items: center; justify-content: center;
}
.theme-toggle-fab:hover { border-color: var(--accent); }
.theme-toggle-fab .icon-light { display: none; }
:root[data-theme="light"] .theme-toggle-fab .icon-dark { display: none; }
:root[data-theme="light"] .theme-toggle-fab .icon-light { display: inline; }

.tools-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.tool-card { cursor: pointer; }
.tool-card h3 { margin: 0 0 6px; font-size: 15px; }
.tool-card p { margin: 0; font-size: 13px; color: var(--text-dim); }
.tool-card .icon { font-size: 24px; margin-bottom: 10px; }

.tool-panel { display: none; margin-top: 24px; }
.tool-panel.active { display: block; }
.tool-result { margin-top: 18px; padding: 16px; background: var(--surface-2); border-radius: var(--radius-sm); }
.tool-result .big { font-size: 26px; font-weight: 700; color: var(--accent); }
.tool-result .row { display: flex; justify-content: space-between; font-size: 13px; color: var(--text-dim); margin-top: 4px; }

.stat-badges { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 20px; }
.stat-badge { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 10px 16px; }
.stat-badge .label { font-size: 12px; color: var(--text-dim); }
.stat-badge .value { font-size: 18px; font-weight: 700; margin-top: 2px; }

.app-footer {
  margin-top: 40px;
  padding: 16px 0;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 12px;
  color: var(--text-dim);
  font-family: "Share Tech Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}
.app-footer strong { color: var(--text); font-weight: 600; }
.app-footer-version { color: var(--accent); font-weight: 600; }

@media (max-width: 720px) {
  .app-shell { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: static; flex-direction: row; align-items: center; padding: 12px 16px; }
  .sidebar nav { flex-direction: row; }
  .brand { padding: 0; margin-right: 12px; }
  .sidebar-footer { flex-direction: row; margin-left: auto; border: none; padding: 0; }
  .theme-toggle { width: auto; margin-bottom: 0; }
  .theme-toggle::after { display: none; }
  .content { padding: 20px 16px 40px; }
  form.form-grid { grid-template-columns: 1fr; }
}