/* ── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:           #eef2ee;
  --surface:      #ffffff;
  --border:       #d4ddd4;
  --border-light: #e8ede8;
  --text:         #1a2e1a;
  --text-light:   #334d33;
  --muted:        #5c7a5c;
  --accent:       #15803d;
  --accent-hover: #166534;
  --accent-light: #f0fdf4;
  --danger:       #b91c1c;
  --shadow-sm:    0 1px 3px rgba(21,128,61,0.08), 0 1px 2px rgba(21,128,61,0.04);
  --shadow-md:    0 4px 12px rgba(21,128,61,0.10), 0 2px 4px rgba(21,128,61,0.05);

  --ch0: #1d4ed8;
  --ch1: #b45309;
  --ch2: #7c3aed;
  --ch3: #be123c;
  --ch4: #0f766e;
  --ch5: #0369a1;
  --ch6: #c2410c;
  --ch7: #4338ca;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
               'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Top accent stripe ──────────────────────────────────────── */
body::before {
  content: '';
  display: block;
  height: 4px;
  background: linear-gradient(90deg, #166534 0%, #4ade80 100%);
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
}

/* ── Navbar ─────────────────────────────────────────────────── */
.navbar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: stretch;
  padding: 0 36px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 4px;
  z-index: 100;
  height: 60px;
  box-shadow: var(--shadow-sm);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-self: start;
}

.nav-brand-name {
  font-weight: 500;
  color: var(--accent);
  font-size: 18px;
  letter-spacing: 0.5px;
}

.nav-brand-divider {
  width: 1px;
  height: 20px;
  background: var(--border);
}

.nav-brand-subtitle {
  color: var(--muted);
  font-size: 13.5px;
  font-weight: 400;
}

.nav-links {
  display: flex;
  align-items: stretch;
  gap: 0;
}

.nav-links a {
  display: flex;
  align-items: center;
  padding: 0 22px;
  color: var(--muted);
  font-size: 15.5px;
  font-weight: 500;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
  text-decoration: none;
  white-space: nowrap;
}

.nav-links a:hover {
  color: var(--text);
  text-decoration: none;
}

.nav-links a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 600;
}

.nav-right {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

.nav-user-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px 5px 6px;
  background: var(--accent-light);
  border: 1px solid #bbf7d0;
  border-radius: 20px;
  color: var(--accent);
}

.nav-user-avatar {
  width: 26px;
  height: 26px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  flex-shrink: 0;
}

.nav-user-name {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--accent);
}

.nav-logout {
  padding: 6px 14px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--danger);
  font-size: 13.5px;
  font-weight: 500;
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s;
  white-space: nowrap;
}

.nav-logout:hover {
  background: #fef2f2;
  border-color: #fecaca;
  text-decoration: none;
}

/* ── Main ───────────────────────────────────────────────────── */
main {
  padding: 24px 32px;
  margin-top: 4px; /* clears top stripe */
}

/* ── Login ──────────────────────────────────────────────────── */
.login-bg {
  min-height: 100vh;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 48px 44px;
  width: 400px;
  box-shadow: var(--shadow-md);
}

.login-header {
  text-align: center;
  margin-bottom: 32px;
}

.login-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.login-subtitle {
  font-size: 12.5px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.form-group { margin-bottom: 20px; }

.form-group label {
  display: block;
  margin-bottom: 7px;
  color: var(--text-light);
  font-size: 13px;
  font-weight: 600;
}

.form-group input {
  width: 100%;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: inherit;
  font-size: 15px;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form-group input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(26,79,186,0.12);
}

.btn {
  padding: 11px 22px;
  border: none;
  border-radius: 6px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, box-shadow 0.15s;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 2px 8px rgba(26,79,186,0.25);
}

.btn-block { display: block; width: 100%; margin-top: 10px; }

.btn-refresh {
  padding: 7px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-light);
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  white-space: nowrap;
}

.btn-refresh:hover:not(:disabled) {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
}

.btn-refresh:disabled {
  opacity: 0.4;
  cursor: default;
}

.alert {
  padding: 11px 15px;
  border-radius: 6px;
  margin-bottom: 20px;
  font-size: 14px;
}

.alert-error {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: var(--danger);
}

/* ── Controls bar ───────────────────────────────────────────── */
.controls-bar {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 20px;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  box-shadow: var(--shadow-sm);
}

.select {
  padding: 8px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: inherit;
  font-size: 14px;
  outline: none;
  cursor: pointer;
  transition: border-color 0.15s;
  min-width: 200px;
}

.select:focus { border-color: var(--accent); }

.controls-sep {
  width: 1px;
  height: 22px;
  background: var(--border);
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-light);
  font-size: 14px;
  cursor: pointer;
  user-select: none;
}

.toggle-label input[type="checkbox"] {
  accent-color: var(--accent);
  width: 15px;
  height: 15px;
}

.status-badge {
  margin-left: auto;
  font-size: 12.5px;
  color: var(--muted);
  white-space: nowrap;
}

/* ── Data table ─────────────────────────────────────────────── */
.table-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.table-wrapper {
  overflow-x: auto;
}

.table-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 11px 18px;
  border-top: 1px solid var(--border);
  background: #f8fbf8;
  flex-wrap: wrap;
  gap: 10px;
}

.row-info {
  font-size: 13px;
  color: var(--muted);
}

.page-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-size-label {
  font-size: 13px;
  color: var(--muted);
}

.select-sm {
  padding: 5px 8px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--surface);
  color: var(--text);
  font-family: inherit;
  font-size: 13px;
  outline: none;
}

.select-sm:focus { border-color: var(--accent); }

.page-sep { width: 1px; height: 20px; background: var(--border); }

.btn-page {
  padding: 5px 14px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--surface);
  color: var(--text-light);
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.btn-page:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

.btn-page:disabled { opacity: 0.35; cursor: default; }

.page-info-text {
  font-size: 13px;
  color: var(--text-light);
  font-weight: 600;
  white-space: nowrap;
}

#measureTable {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
  white-space: nowrap;
}

#measureTable thead {
  position: sticky;
  top: 0;
  z-index: 10;
}

#measureTable th {
  background: #f8f9fc;
  padding: 10px 13px;
  text-align: right;
  border-bottom: 2px solid var(--border);
  border-right: 1px solid var(--border-light);
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

.ts-header {
  text-align: center !important;
  min-width: 180px;
  color: var(--text-light) !important;
}

.group-header {
  text-align: center !important;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  padding: 7px 12px;
  border-bottom: 1px solid var(--border);
}

.group-current {
  background: #eff6ff;
  color: #1e40af;
  border-right: 2px solid var(--border);
}

.group-voltage {
  background: #f0fdf4;
  color: #15803d;
}

.group-sep {
  border-left: 2px solid var(--border) !important;
}

.ch-header {
  text-align: center !important;
  color: var(--text) !important;
  font-size: 12px !important;
  font-weight: 700 !important;
  letter-spacing: 0.2px !important;
  white-space: normal !important;
  max-width: 110px;
  line-height: 1.3;
}

.sub-header { font-size: 10.5px !important; }

/* Group-based header backgrounds */
.ch-header.ch-0, .ch-header.ch-1,
.ch-header.ch-2, .ch-header.ch-3 {
  background: #e8f0fb !important;
  color: #2a52a0 !important;
}
.ch-header.ch-4, .ch-header.ch-5,
.ch-header.ch-6, .ch-header.ch-7 {
  background: #daf0e6 !important;
  color: #1a6b3f !important;
}

/* Sub-header row: current group (cols 1-8), voltage group (cols 9-16) */
#measureTable thead tr:last-child th:nth-child(-n+8) {
  background: #eef4fc;
}
#measureTable thead tr:last-child th:nth-child(n+9) {
  background: #e8f5ee;
}

#measureTable td {
  padding: 7px 13px;
  text-align: right;
  border-bottom: 1px solid var(--border-light);
  border-right: 1px solid var(--border-light);
  font-variant-numeric: tabular-nums;
  color: var(--text);
}

#measureTable td:first-child {
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}

/* Column group fills — current (cols 2-9) and voltage (cols 10-17) */
#measureTable tbody td:nth-child(n+2):nth-child(-n+9) {
  background: #f4f7fd;
}
#measureTable tbody td:nth-child(n+10) {
  background: #f3faf5;
}

/* Even-row slightly deeper tint */
#measureTable tbody tr:nth-child(even) td:nth-child(1)          { background: #f7f8fa; }
#measureTable tbody tr:nth-child(even) td:nth-child(n+2):nth-child(-n+9) { background: #eaf0f9; }
#measureTable tbody tr:nth-child(even) td:nth-child(n+10)        { background: #e8f5ee; }

#measureTable tbody tr:hover td { background: var(--accent-light) !important; }

#measureTable tbody td:nth-child(10) {
  border-left: 2px solid var(--border);
}

.empty-row {
  text-align: center !important;
  color: var(--muted);
  padding: 56px !important;
  font-size: 14px;
}

@keyframes row-in {
  from { background: #dbeafe; }
  to   { background: transparent; }
}
.new-row { animation: row-in 3s ease-out; }

/* ── Time range bar (plot page) ─────────────────────────────── */
.time-bar {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 20px;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  box-shadow: var(--shadow-sm);
}

.time-bar-label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  color: var(--muted);
  margin-right: 4px;
  white-space: nowrap;
}

.btn-preset {
  padding: 6px 16px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--surface);
  color: var(--text-light);
  font-family: inherit;
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

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

.btn-preset.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}

.time-bar-sep {
  width: 1px;
  height: 24px;
  background: var(--border);
  margin: 0 6px;
  flex-shrink: 0;
}

.range-group {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.range-group label {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  white-space: nowrap;
}

input[type="datetime-local"] {
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: inherit;
  font-size: 13px;
  color: var(--text);
  background: var(--surface);
  outline: none;
  transition: border-color 0.15s;
}

input[type="datetime-local"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(26,79,186,0.10);
}

.btn-apply {
  padding: 6px 16px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-family: inherit;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}

.btn-apply:hover { background: var(--accent-hover); }

/* ── Chart toolbar (plot page) ──────────────────────────────── */
.chart-toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.chart-type-label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

.chart-type-group {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}

.btn-chart-type {
  padding: 6px 16px;
  border: none;
  border-right: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-light);
  font-family: inherit;
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}

.btn-chart-type:last-child { border-right: none; }

.btn-chart-type:hover:not(.active) {
  background: var(--accent-light);
  color: var(--accent);
}

.btn-chart-type.active {
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}

/* ── Channel dropdown (plot page) ───────────────────────────── */
.ch-dropdown-wrapper {
  position: relative;
}

.btn-ch-dropdown {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text-light);
  font-family: inherit;
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
  white-space: nowrap;
}

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

.ch-dropdown-panel {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow-md);
  padding: 10px 4px;
  z-index: 50;
  min-width: 230px;
}

.ch-dropdown-panel.open { display: block; }

.ch-dropdown-group-label {
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--muted);
  padding: 6px 14px 4px;
}

.ch-dropdown-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  cursor: pointer;
  font-size: 13.5px;
  color: var(--text-light);
  transition: background 0.12s;
  user-select: none;
}

.ch-dropdown-item:hover { background: var(--accent-light); color: var(--text); }

.ch-dropdown-item input[type="checkbox"] {
  accent-color: var(--accent);
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  cursor: pointer;
}

.ch-color-dot {
  width: 12px;
  height: 3px;
  border-radius: 2px;
  flex-shrink: 0;
}

.ch-dropdown-sep {
  height: 1px;
  background: var(--border-light);
  margin: 6px 14px;
}

/* ── Chart card ─────────────────────────────────────────────── */
.chart-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px 20px;
  box-shadow: var(--shadow-sm);
}

.chart-label {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--muted);
  margin-bottom: 12px;
}

/* ── Settings page ───────────────────────────────────────────── */
.settings-page {
  max-width: 680px;
}

.settings-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.settings-card-title {
  padding: 16px 24px;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  background: #f8fbf8;
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-light);
  gap: 24px;
}

.setting-row:last-child { border-bottom: none; }

.setting-info { flex: 1; }

.setting-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 3px;
}

.setting-desc {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

/* Toggle switch */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 28px;
  flex-shrink: 0;
}

.toggle-switch input { opacity: 0; width: 0; height: 0; }

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--border);
  border-radius: 28px;
  cursor: pointer;
  transition: background 0.2s;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 22px;
  height: 22px;
  left: 3px;
  bottom: 3px;
  background: #fff;
  border-radius: 50%;
  transition: transform 0.2s;
  box-shadow: 0 1px 4px rgba(0,0,0,0.18);
}

.toggle-switch input:checked + .toggle-slider {
  background: var(--accent);
}

.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(22px);
}