/* ============================================
   FLATLAND OS - SHARED DESIGN SYSTEM
   Link this file on every page:
   <link rel="stylesheet" href="/theme.css">
   ============================================ */

/* ---- COLOR TOKENS ---- */
:root {
  /* Brand constants, do not change per theme */
  --flatland-black: #000000;
  --flatland-white: #FFFFFF;
  --flatland-red: #CC0000;
  --flatland-red-hover: #E60000;
  --flatland-blue: #003087;
  --flatland-blue-hover: #0040AD;

  /* Dark theme (default) */
  --bg-app: #000000;
  --bg-sidebar: #0D0D0D;
  --bg-surface: #161616;
  --bg-surface-hover: #1F1F1F;
  --border-color: #2A2A2A;
  --text-primary: #FFFFFF;
  --text-secondary: #A3A3A3;
  --text-muted: #6B6B6B;
  --accent-primary: #4D8DFF;
  --accent-primary-hover: #7FB0FF;
  --accent-alert: #FF5C5C;
  --accent-alert-hover: #FF8080;
  --focus-ring: #7FB0FF;
  --shadow: 0 1px 2px rgba(0,0,0,.30), 0 4px 14px rgba(0,0,0,.18);
  --shadow-lift: 0 4px 8px rgba(0,0,0,.30), 0 12px 28px rgba(0,0,0,.22);
}

[data-theme="light"] {
  --bg-app: #FFFFFF;
  --bg-sidebar: #FFFFFF;
  --bg-surface: #FFFFFF;
  --bg-surface-hover: #F5F5F5;
  --border-color: #E0E0E0;
  --text-primary: #000000;
  --text-secondary: #555555;
  --text-muted: #888888;
  --accent-primary: var(--flatland-blue);
  --accent-primary-hover: #002569;
  --accent-alert: var(--flatland-red);
  --accent-alert-hover: #A30000;
  --focus-ring: var(--flatland-blue);
  --shadow: 0 1px 2px rgba(0,0,0,.06), 0 2px 8px rgba(0,0,0,.06);
  --shadow-lift: 0 4px 10px rgba(0,0,0,.10), 0 10px 24px rgba(0,0,0,.10);
}

/* ---- RESET / BASE ---- */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg-app);
  color: var(--text-primary);
  font-family: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  padding-left: 220px;
}

body.no-sidebar {
  padding-left: 0;
}

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

a:hover {
  color: var(--accent-primary-hover);
}

:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

/* ---- SIDEBAR ---- */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 220px;
  height: 100vh;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  padding: 20px 0;
  overflow-y: auto;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 20px 20px;
  font-weight: 700;
  font-size: 15px;
  color: var(--text-primary);
}

.sidebar-brand .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-primary);
}

.sidebar-group-label {
  padding: 16px 20px 6px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.sidebar-link {
  display: block;
  padding: 8px 20px;
  color: var(--text-secondary);
  font-size: 14px;
  border-left: 2px solid transparent;
}

.sidebar-link:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
}

.sidebar-link.active {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
  border-left: 2px solid var(--accent-primary);
  font-weight: 600;
}

.sidebar-footer {
  margin-top: auto;
  padding: 12px 20px 0;
  border-top: 1px solid var(--border-color);
  display: flex;
  gap: 8px;
}

/* ---- TOP BAR (pages without a sidebar) ---- */
.app-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 24px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
}

.app-topbar .brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.3px;
  color: var(--text-primary);
}

.app-topbar .brand .dot {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: var(--accent-alert);
  flex-shrink: 0;
}

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

.icon-btn {
  display: inline-flex;
  align-items: center;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 8px 14px;
  font-size: 12.5px;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  text-decoration: none;
  transition: background .12s, color .12s, border-color .12s;
}

.icon-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent-primary);
  background: var(--bg-surface-hover);
}

/* ---- PAGE HEADER ---- */
.page-header {
  padding: 32px 32px 16px;
}

.page-header h1 {
  margin: 0 0 6px;
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
}

.page-header p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 14px;
}

.page-header-rule {
  height: 2px;
  background: var(--accent-primary);
  border: none;
  margin: 16px 32px 24px;
  width: 60px;
}

.page-content {
  padding: 0 32px 40px;
}

/* ---- CARDS / STAT TILES ---- */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 16px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
}

/* ---- TILES GRID (descriptive cards) ---- */
.tiles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 640px) {
  .tiles { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 900px) {
  .tiles.cols-3 { grid-template-columns: 1fr 1fr 1fr; }
}

.stat-tile {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--border-color);
  border-radius: 6px;
  padding: 14px 16px;
}

.stat-tile.status-alert {
  border-left-color: var(--accent-alert);
}

.stat-tile.status-good {
  border-left-color: var(--accent-primary);
}

.stat-tile .stat-number {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
}

.stat-tile.status-alert .stat-number {
  color: var(--accent-alert);
}

.stat-tile.status-good .stat-number {
  color: var(--accent-primary);
}

.stat-tile .stat-label {
  margin-top: 4px;
  font-size: 12.5px;
  color: var(--text-secondary);
}

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
}

.btn:hover {
  background: var(--bg-surface-hover);
}

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

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

.btn-alert {
  background: var(--accent-alert);
  border-color: var(--accent-alert);
  color: var(--flatland-white);
}

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

/* ---- STATUS BADGES ---- */
.badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.badge-alert {
  background: rgba(204, 0, 0, 0.15);
  color: var(--accent-alert);
  border: 1px solid rgba(204, 0, 0, 0.4);
}

.badge-good {
  background: rgba(0, 48, 135, 0.15);
  color: var(--accent-primary);
  border: 1px solid rgba(0, 48, 135, 0.4);
}

[data-theme="light"] .badge-good {
  background: rgba(0, 48, 135, 0.08);
}

.badge-neutral {
  background: var(--bg-surface-hover);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

/* ---- TABLES ---- */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

th {
  text-align: left;
  padding: 10px 12px;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border-color);
}

td {
  padding: 12px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}

tr:hover td {
  background: var(--bg-surface-hover);
}

/* ---- THEME TOGGLE BUTTON ---- */
.theme-toggle {
  flex: 1;
  text-align: center;
  padding: 8px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-secondary);
  font-size: 12.5px;
  cursor: pointer;
}

.theme-toggle:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
}

/* ---- RESPONSIVE ---- */
@media (max-width: 768px) {
  body {
    padding-left: 0;
  }

  .sidebar {
    position: static;
    width: 100%;
    height: auto;
  }

  .page-header,
  .page-content {
    padding-left: 16px;
    padding-right: 16px;
  }
}