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

:root {
  --bg: #0a0a0f;
  --card-bg: #12121a;
  --card-bg-hover: #1a1a25;
  --text: #e4e4e7;
  --text-secondary: #a1a1aa;
  --primary: #6366f1;
  --primary-hover: #818cf8;
  --primary-muted: rgba(99, 102, 241, 0.15);
  --success: #10b981;
  --error: #ef4444;
  --border: #27272a;
  --shadow: 0 1px 3px rgba(0,0,0,.3), 0 1px 2px rgba(0,0,0,.2);
  --shadow-lg: 0 10px 25px rgba(0,0,0,.4);
  --radius: 12px;
  --radius-sm: 8px;

  /* ── Chart palette (validated Categorical, dark surface #12121a) ──
     Fixed slot per meter — never cycled. */
  --series-cold:  #3987e5;  /* water:cold       — blue   */
  --series-hot:   #d95926;  /* water:hot        — orange */
  --series-t1:    #199e70;  /* electricity:t1   — aqua   */
  --series-t2:    #c98500;  /* electricity:t2   — yellow */
  --series-t3:    #d55181;  /* electricity:t3   — magenta*/
  --series-total: #008300;  /* electricity:total— green  */
  --series-temp:  #ef4444;  /* temperature line — red    */

  /* ── Status / severity (reserved, never reused for series) ── */
  --status-info:    #3987e5;
  --status-warning: #fab219;
  --status-critical:#ec835a;

  --delta-up:   #ef4444;  /* consumption rose  (more spent) */
  --delta-down: #199e70;  /* consumption fell   (saved)     */
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ── Navbar ── */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 60px;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}
.navbar-brand { font-weight: 700; font-size: 1.125rem; }
.navbar-links { display: flex; align-items: center; gap: 0.5rem; }
.navbar-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: .9rem;
  transition: color .15s;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
}
.navbar-links a:hover,
.navbar-links a.active { color: var(--text); background: var(--primary-muted); }
.btn-logout {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: .85rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all .15s;
  margin-left: 0.5rem;
}
.btn-logout:hover { border-color: var(--error); color: var(--error); }

/* ── Login Page ── */
.login-page {
  display: flex;
  flex-direction: column;
}
.login-page .navbar { border-bottom: 1px solid var(--border); }
.login-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}
.login-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow-lg);
}
.login-card h2 { font-size: 1.5rem; margin-bottom: 0.5rem; }
.login-subtitle { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 2rem; }
.auth-switch {
  text-align: center;
  margin-top: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}
.auth-switch a { color: var(--primary); text-decoration: none; }
.auth-switch a:hover { text-decoration: underline; }
.btn-full { width: 100%; margin-top: 0.5rem; }
.form-error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--error);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

/* ── Container ── */
.container { max-width: 1200px; margin: 0 auto; padding: 2rem; }

/* ── Date Selector ── */
.date-selector {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow);
}
.date-selector h2 { margin-bottom: 1rem; font-size: 1.25rem; }
.date-inputs { display: flex; gap: 2rem; align-items: center; flex-wrap: wrap; }
.date-inputs label { display: flex; align-items: center; gap: .5rem; font-size: .95rem; }
.date-inputs select,
.date-inputs input {
  padding: .5rem .75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .95rem;
  background: var(--bg);
  color: var(--text);
  outline: none;
}
.date-inputs select:focus,
.date-inputs input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-muted);
}

/* ── Upload Grid ── */
.upload-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.upload-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transition: border-color .2s, box-shadow .2s;
}
.upload-card:hover { border-color: var(--primary); box-shadow: var(--shadow-lg); }
.upload-card .card-icon { font-size: 2.5rem; margin-bottom: .5rem; }
.upload-card h3 { margin-bottom: .5rem; font-size: 1.1rem; }
.card-info {
  font-size: .85rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  min-height: 1.5em;
}

/* ── Dropzone ── */
.dropzone {
  width: 100%;
  cursor: pointer;
  border: 2px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  transition: border-color .2s, background .2s;
}
.dropzone:hover,
.dropzone.dragover {
  border-color: var(--primary);
  background: var(--primary-muted);
}
.dropzone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .5rem;
  color: var(--text-secondary);
}
.dropzone-icon { font-size: 2rem; }
.dropzone input { display: none; }

/* ── Status ── */
.status {
  margin-top: .75rem;
  font-size: .85rem;
  min-height: 1.2em;
}
.status.loading { color: var(--primary); }
.status.success { color: var(--success); }
.status.error { color: var(--error); }

/* ── Dashboard ── */
.dashboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}
.dashboard-header h2 { font-size: 1.5rem; }
.period-selector { display: flex; align-items: center; gap: 1rem; }
.period-selector select {
  padding: .5rem .75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .9rem;
  background: var(--bg);
  color: var(--text);
  outline: none;
}

.btn-primary {
  padding: .5rem 1.25rem;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  cursor: pointer;
  transition: background .15s;
}
.btn-primary:hover { background: var(--primary-hover); }

/* ── Stats Row ── */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}
.stat-card {
  background: var(--card-bg);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow);
  text-align: center;
}
.stat-card .stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--primary);
}
.stat-card .stat-label {
  font-size: .8rem;
  color: var(--text-secondary);
  margin-top: .25rem;
}

/* ── Charts ── */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(480px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}
.chart-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}
.chart-card.full-width { grid-column: 1 / -1; }
.chart-card h3 {
  font-size: 1rem;
  margin-bottom: 1rem;
  color: var(--text-secondary);
}
/* Fixed-height box so maintainAspectRatio:false charts size correctly */
.chart-box { position: relative; height: 240px; }
.chart-box canvas { position: absolute; inset: 0; }

/* ── Table ── */
.table-wrapper { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .9rem; }
th, td {
  text-align: left;
  padding: .75rem 1rem;
  border-bottom: 1px solid var(--border);
}
th { font-weight: 600; color: var(--text-secondary); font-size: .8rem; text-transform: uppercase; }
td button {
  background: none;
  border: none;
  color: var(--error);
  cursor: pointer;
  font-size: .85rem;
}
td button:hover { text-decoration: underline; }

/* ── Manual Input ── */
.manual-input {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
  width: 100%;
}
.manual-input input {
  flex: 1;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.15s;
  background: var(--bg);
  color: var(--text);
}
.manual-input input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-muted);
}
.btn-save {
  padding: 0.5rem 0.75rem;
  background: var(--success);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 1rem;
  transition: background 0.15s;
}
.btn-save:hover { background: #059669; }

/* ── Table Action Buttons ── */
.actions-cell {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}
.btn-edit,
.btn-delete {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.85rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  transition: background 0.15s;
}
.btn-edit { color: var(--primary); }
.btn-edit:hover { background: #eff6ff; }
.btn-delete { color: var(--error); }
.btn-delete:hover { background: #fef2f2; }

/* ── Modal ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s, visibility 0.2s;
}
.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}
.modal {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: 90%;
  max-width: 420px;
  overflow: hidden;
}
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
}
.modal-header h3 { font-size: 1.1rem; }
.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-secondary);
  line-height: 1;
}
.modal-close:hover { color: var(--text); }
.modal-body { padding: 1.5rem; }
.modal-info {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}
.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
  background: var(--card-bg-hover);
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.form-group label {
  font-size: 0.9rem;
  font-weight: 600;
}
.form-input {
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.15s;
  background: var(--bg);
  color: var(--text);
}
.form-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-muted);
}
.btn-secondary {
  padding: 0.5rem 1.25rem;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-secondary:hover { background: var(--border); }

/* ── KPI cards ── */
.kpi-row {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}
.kpi-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: border-color .2s, transform .15s;
}
.kpi-card:hover { border-color: var(--primary); transform: translateY(-2px); }
.kpi-head { display: flex; align-items: center; justify-content: space-between; }
.kpi-icon { font-size: 1.1rem; }
.kpi-delta {
  font-size: .8rem;
  font-weight: 600;
  padding: 0.1rem 0.45rem;
  border-radius: 6px;
  font-variant-numeric: tabular-nums;
}
.kpi-delta.up   { color: var(--delta-up);   background: rgba(239,68,68,.12); }
.kpi-delta.down { color: var(--delta-down); background: rgba(25,158,112,.12); }
.kpi-delta.flat { color: var(--text-secondary); background: rgba(161,161,170,.12); }
.kpi-value {
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}
.kpi-value .unit { font-size: .9rem; font-weight: 500; color: var(--text-secondary); margin-left: .25rem; }
.kpi-label { font-size: .8rem; color: var(--text-secondary); }
.kpi-spark { height: 28px; margin-top: .15rem; }
.kpi-spark svg { width: 100%; height: 100%; display: block; }

/* ── Segmented tabs ── */
.tabs {
  display: inline-flex;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 3px;
  gap: 2px;
}
.tab {
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: .9rem;
  font-weight: 500;
  padding: .5rem 1.1rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background .15s, color .15s;
}
.tab:hover { color: var(--text); }
.tab.active { background: var(--primary); color: #fff; }

/* ── Small multiples (two single-axis charts side by side) ── */
.multiples-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}
.multiples-grid .chart-card { margin-bottom: 0; }

/* ── Grouped / collapsible table ── */
.meter-group {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1rem;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.meter-group-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .9rem 1.25rem;
  cursor: pointer;
  user-select: none;
  background: var(--card-bg-hover);
  transition: background .15s;
}
.meter-group-header:hover { background: rgba(99,102,241,.08); }
.meter-group-title { display: flex; align-items: center; gap: .6rem; font-weight: 600; font-size: 1rem; }
.meter-group-title .group-count { color: var(--text-secondary); font-weight: 400; font-size: .9rem; }
td.meter-cell { white-space: nowrap; }
.meter-group-chevron { color: var(--text-secondary); transition: transform .2s; font-size: .8rem; }
.meter-group.collapsed .meter-group-chevron { transform: rotate(-90deg); }
.meter-group-body { overflow: hidden; }
.meter-group.collapsed .meter-group-body { display: none; }

/* ── AI Analytics panel ── */
.ai-panel {
  background: linear-gradient(135deg, var(--card-bg) 0%, #16161f 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-lg);
  margin-bottom: 2rem;
}
.ai-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1rem;
}
.ai-panel-title { display: flex; align-items: center; gap: .6rem; font-size: 1.15rem; font-weight: 700; }
.ai-summary { color: var(--text-secondary); font-size: .92rem; margin-bottom: 1.25rem; line-height: 1.6; }
.ai-footer { margin-top: 1.25rem; font-size: .78rem; color: var(--text-secondary); text-align: right; }
.ai-section-label {
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--text-secondary);
  margin: 1.25rem 0 .75rem;
  font-weight: 600;
}

.insight-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1rem; }
.insight-card {
  background: rgba(255,255,255,.02);
  border: 1px solid var(--border);
  border-left: 3px solid var(--status-info);
  border-radius: var(--radius-sm);
  padding: 1rem 1.1rem;
}
.insight-card.severity-warning  { border-left-color: var(--status-warning); }
.insight-card.severity-critical { border-left-color: var(--status-critical); }
.insight-card-head { display: flex; align-items: center; gap: .5rem; margin-bottom: .4rem; }
.insight-card-icon { font-size: 1.05rem; }
.insight-card-title { font-weight: 600; font-size: .95rem; }
.insight-tag {
  font-size: .68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .04em;
  padding: .1rem .4rem;
  border-radius: 4px;
  margin-left: auto;
  background: rgba(57,135,229,.15);
  color: var(--status-info);
}
.insight-tag.warning  { background: rgba(250,178,25,.15); color: var(--status-warning); }
.insight-tag.critical { background: rgba(236,131,90,.18); color: var(--status-critical); }
.insight-card-detail { font-size: .85rem; color: var(--text-secondary); line-height: 1.55; }

.rec-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1rem; }
.recommendation-card {
  background: rgba(25,158,112,.05);
  border: 1px solid rgba(25,158,112,.25);
  border-radius: var(--radius-sm);
  padding: 1rem 1.1rem;
}
.recommendation-card-head { display: flex; align-items: center; gap: .5rem; margin-bottom: .35rem; }
.recommendation-card-title { font-weight: 600; font-size: .95rem; }
.recommendation-card-detail { font-size: .85rem; color: var(--text-secondary); line-height: 1.55; }
.recommendation-impact {
  margin-top: .5rem;
  font-size: .8rem;
  color: var(--series-total);
  font-weight: 500;
}

/* ── States: empty, loading ── */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-secondary);
}
.empty-state .empty-icon { font-size: 2.5rem; margin-bottom: .5rem; display: block; }
.spinner {
  width: 20px; height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  display: inline-block;
  vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }
.ai-loading {
  display: flex;
  align-items: center;
  gap: .75rem;
  color: var(--text-secondary);
  padding: 1.5rem 0;
  font-size: .9rem;
}
.hidden { display: none !important; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .container { padding: 1rem; }
  .charts-grid { grid-template-columns: 1fr; }
  .multiples-grid { grid-template-columns: 1fr; }
  .date-inputs { gap: 1rem; }
  .navbar { padding: 0 1rem; }
  .modal { width: 95%; }
  .dashboard-header { flex-direction: column; align-items: flex-start; }
}