:root {
    --bg: #ffffff;
    --panel: #f7f7f7;
    --border: #dcdad3;
    --text: #1c1d1f;
    --muted: #6b7078;
    --accent: #2b8a5e;
    --accent-hover: #237249;
    --danger: #e5534b;
    --warning: #c98500;
    --input-bg: #ffffff;
    --mono: 'SF Mono', Consolas, 'Courier New', monospace;
  }
  html[data-theme="dark"] {
    --bg: #0f1115;
    --panel: #171a21;
    --border: #2a2f3a;
    --text: #e6e8eb;
    --muted: #8b93a1;
    --input-bg: #0f1115;
    --warning: #eda100;
  }
  @media (prefers-color-scheme: dark) {
    html[data-theme="system"] {
      --bg: #0f1115;
      --panel: #171a21;
      --border: #2a2f3a;
      --text: #e6e8eb;
      --muted: #8b93a1;
      --input-bg: #0f1115;
      --warning: #eda100;
    }
  }
  * { box-sizing: border-box; }
  body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  }

  .lang-switch { display: flex; align-items: center; gap: 6px; font-size: 12px; }
  .lang-switch .lang-btn {
    background: transparent;
    border: none;
    padding: 4px 2px;
    font-size: 12px;
    font-weight: 700;
    color: var(--muted);
    cursor: pointer;
    letter-spacing: 0.02em;
  }
  .lang-switch .lang-btn:hover { color: var(--text); }
  .lang-switch .lang-btn.active { color: var(--accent); }
  .lang-switch .lang-sep { color: var(--border); font-size: 12px; }

  .theme-switch { display: flex; align-items: center; gap: 2px; }
  .theme-switch button {
    background: transparent;
    border: 1px solid transparent;
    border-radius: 6px;
    color: var(--muted);
    padding: 5px;
    line-height: 0;
    cursor: pointer;
  }
  .theme-switch button svg { width: 15px; height: 15px; display: block; }
  .theme-switch button:hover { color: var(--text); }
  .theme-switch button.active { color: var(--accent); border-color: var(--border); background: var(--panel); }

  #login-screen {
    height: 100vh;
    display: flex;
    flex-direction: column;
  }
  #login-screen .login-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
  }
  #login-screen .top-controls { position: absolute; top: 20px; right: 20px; display: flex; gap: 16px; align-items: center; }
  .login-box {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 32px;
    width: 380px;
  }
  .login-box h1 { font-size: 18px; margin: 0 0 20px; }
  .app-version { font-size: 11px; font-weight: 400; color: var(--muted); margin-left: 8px; }
  input[type=password], input[type=text] {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    padding: 10px 12px;
    font-size: 14px;
    font-family: inherit;
  }
  button {
    background: var(--accent);
    border: none;
    border-radius: 8px;
    color: white;
    padding: 10px 16px;
    font-size: 14px;
    cursor: pointer;
    font-weight: 600;
  }
  button:hover { background: var(--accent-hover); }
  button.secondary { background: transparent; border: 1px solid var(--border); color: var(--text); }
  button.copy-value-btn { padding: 2px 8px; font-size: 12px; font-weight: 400; border-radius: 6px; vertical-align: middle; }
  .error-msg { color: var(--danger); font-size: 13px; margin-top: 10px; min-height: 16px; }

  #app { display: none; min-height: 100vh; flex-direction: column; }
  header {
    padding: 14px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  header h1 { font-size: 16px; margin: 0; }

  main { flex: 1; display: flex; }
  nav {
    width: 200px;
    border-right: 1px solid var(--border);
    padding: 16px 0;
  }
  nav button.tab {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    text-align: left;
    background: transparent;
    color: var(--muted);
    border-radius: 0;
    padding: 10px 20px;
    font-weight: 500;
  }
  nav button.tab.active { color: var(--text); background: var(--panel); border-left: 2px solid var(--accent); }
  nav button.tab .nav-icon { width: 16px; height: 16px; flex-shrink: 0; }

  .nav-separator { height: 1px; background: var(--border); margin: 10px 20px; }
  .nav-section-label { padding: 4px 20px; font-size: 15px; font-weight: 400; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); }
  .nav-section-label-user-main { color: var(--accent); }
  #nav-main-label { color: var(--accent); }
  #nav-install-label { color: var(--danger); }
  nav button.tab.install-pending { color: var(--accent); }

  .content { flex: 1; padding: 24px; }

  .system-info-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px;
    max-width: 98%;
    margin-bottom: 16px;
  }
  .system-info-card dl { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: 8px 16px; }
  .system-info-card dt { color: var(--muted); font-size: 14px; }
  .system-info-card dd { margin: 0; font-family: var(--mono); font-size: 16px; }
  .system-info-card h3 { margin: 0 0 12px; font-size: 15px; }
  /* Szablon ukladu kafelkow w srodkowym oknie (glowna kolumna tresci
     zakladki) - ustalony 2026-08-16, obowiazuje na stale dla WSZYSTKICH
     zakladek, nie tylko Poczty. Zasada: 1 kafelek = 100% szerokosci,
     N kafelkow w rzedzie = 100%/N kazdy (grid, nie flex - flex-wrap+
     min-width dawal nierowne szerokosci przy zawijaniu). Jeden wspolny
     odstep (--tile-gap) uzywany JEDNOCZESNIE jako gap miedzy kafelkami
     w rzedzie (lewo/prawo) i jako odstep miedzy rzedami (gora/dol) -
     stąd rowne odstepy z kazdej strony. .tile-row-N wybiera liczbe
     kolumn, .tile-stack pionowo sklada kilka sekcji WEWNATRZ jednego
     miejsca w rzedzie (np. 2 kafelki obok siebie, w lewym kilka sekcji
     jedna pod druga - to wciaz "2 kafelki" na poziomie rzedu).
     Uzycie: <div class="tile-row tile-row-2"><div class="system-info-card">...</div>...</div> */
  :root { --tile-gap: 16px; }
  .tile-row { display: grid; gap: var(--tile-gap); margin-top: var(--tile-gap); align-items: start; }
  .tile-row:first-child { margin-top: 0; }
  .tile-row > .system-info-card,
  .tile-stack > .system-info-card { margin-bottom: 0; max-width: 100%; }
  .tile-row-1 { grid-template-columns: minmax(0, 1fr); }
  .tile-row-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tile-row-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .tile-row-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .tile-row-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  /* Rownanie wysokosci wyjatkowe TYLKO dla tile-row-6 (jedyne obecne
     uzycie: 6 kafelkow KPI na Dashboardzie usera - Uptime/CPU/RAM/Dysk/
     Strony/Bazy) - .tile-row bazowo ma align-items:start (2026-08-16,
     celowy wybor dla innych rzedow, np. gdzie krotszy "Info" kafelek
     obok dluzszego wygladalby dziwnie rozciagniety), ale w tym
     konkretnym rzedzie user chcial rowna wysokosc mimo ze Uptime (bez
     paska postepu) jest naturalnie krotszy niz reszta (z meter-track) -
     pierwsza proba (dolozenie 3. linii z adresem IP) zostala odrzucona
     na rzecz tego prostszego, tresci-niezaleznego rozwiazania. */
  .tile-row-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); align-items: stretch; }
  .tile-stack { display: flex; flex-direction: column; gap: var(--tile-gap); min-width: 0; }
  @media (max-width: 760px) {
    .tile-row-2, .tile-row-3, .tile-row-4, .tile-row-5, .tile-row-6 { grid-template-columns: minmax(0, 1fr); }
  }

  .info-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 24px; }
  .info-grid .info-label { color: var(--muted); font-size: 14px; }
  .info-grid .info-label::after { content: ":"; }
  .info-grid .info-value { font-family: var(--mono); font-size: 16px; overflow-wrap: anywhere; }

  .firewall-table { width: 100%; border-collapse: collapse; font-size: 13px; margin-bottom: 16px; }
  .firewall-table th { text-align: left; color: var(--muted); font-size: 12px; font-weight: 600; padding: 6px 10px; border-bottom: 1px solid var(--border); white-space: nowrap; }
  .firewall-table td { padding: 6px 10px; border-bottom: 1px solid var(--border); font-family: var(--mono); white-space: nowrap; }
  .firewall-table tr:last-child td { border-bottom: none; }
  .php-modules-table { font-size: 15px; }
  .php-modules-table th { font-size: 14px; }

  .system-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
    max-width: 98%;
    margin-bottom: 16px;
  }
  .stat-tile {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
  }
  .stat-tile .stat-label { font-size: 12px; color: var(--muted); margin-bottom: 6px; }
  .stat-tile .stat-value { font-size: 26px; font-weight: 600; margin-bottom: 10px; }
  .meter-track { height: 6px; border-radius: 4px; background: var(--border); overflow: hidden; }
  .meter-fill { height: 100%; border-radius: 4px; }
  .meter-fill.good { background: var(--accent); }
  .meter-fill.warning { background: var(--warning); }
  .meter-fill.critical { background: var(--danger); }
  .stat-tile .stat-detail { margin-top: 8px; font-size: 11px; color: var(--muted); font-family: var(--mono); }

  .empty-state { color: var(--muted); padding: 40px; text-align: center; }

  .services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
    max-width: 98%;
  }
  .service-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
    cursor: pointer;
    transition: border-color 0.15s;
  }
  .service-card:hover { border-color: var(--accent); }
  .service-card-header { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 8px; }
  .service-card .service-name { font-weight: 600; font-size: 14px; }
  .service-card .service-detail { font-size: 11px; color: var(--muted); font-family: var(--mono); }

  .status-badge {
    font-size: 11px;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 999px;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    white-space: nowrap;
  }
  .status-badge.active { background: rgba(43, 138, 94, 0.15); color: var(--accent); }
  .status-badge.inactive { background: rgba(229, 83, 75, 0.15); color: var(--danger); }

  .update-badge {
    font-size: 13px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 999px;
    border: none;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    white-space: nowrap;
  }
  .update-badge.stable { background: rgba(43, 138, 94, 0.15); color: var(--accent); cursor: default; }
  .update-badge.update { background: rgba(229, 83, 75, 0.15); color: var(--danger); cursor: pointer; }
  .update-badge.update:hover { background: rgba(229, 83, 75, 0.25); }
  .update-badge:disabled { opacity: 0.7; cursor: default; }

  .service-actions { display: flex; gap: 10px; margin-top: 16px; }
  button.danger { background: var(--danger); }
  button.danger:hover { background: #c94840; }
  .service-actions button:disabled { opacity: 0.6; cursor: not-allowed; }

  .action-msg { margin-top: 10px; font-size: 13px; min-height: 16px; }
  .action-msg.error { color: var(--danger); }
  .action-msg.success { color: var(--accent); }

  .app-footer {
    padding: 8px 20px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    flex-shrink: 0;
  }
  .app-footer .footer-clock { color: var(--muted); font-size: 12px; font-family: var(--mono); }