:root{
    --bg:#EEF3F9; --panel:#FFFFFF; --panel2:#E3EAF3; --border:#D2DEEA;
    --text:#1E2A3A; --text2:#5B6B7F; --text3:#8C99AA;
    --accent:#2F6FED; --accent-bg:#E7EFFE; --accent-border:#2F6FED;
    --warn:#A66A0C; --warn-bg:#FBF0DD;
    --danger:#C4423B; --danger-bg:#FBEAE9;
    --mono:'SF Mono','Consolas','Menlo',monospace;
    --sans:-apple-system,'Segoe UI',Helvetica,Arial,sans-serif;
  }
  /* Hides raw page content until nav.js has moved it into the styled layout — without
     this, the browser can paint the unwrapped content for a split second before any JS
     even runs, which is the flash/resize this is meant to prevent entirely. */
  /* (no opacity fade any more: a transition never runs while the page is in a background tab / hidden webview, which
     left the whole page invisible — fields "disappearing" — even though it had loaded) */
  #page-content{display:none}
  *{box-sizing:border-box}
  body{margin:0;background:var(--bg);color:var(--text);font-family:var(--sans);padding:24px;line-height:1.5}
  .topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;flex-wrap:wrap;gap:12px}
  .site-name{font-size:20px;font-weight:600}
  .updated{font-family:var(--mono);font-size:12px;color:var(--text2);display:flex;align-items:center;gap:10px}
  .refresh-btn{background:var(--panel);border:1px solid var(--border);color:var(--text);padding:6px 12px;border-radius:4px;cursor:pointer;font-size:12px;font-family:var(--sans)}
  .refresh-btn:hover{border-color:var(--accent)}
  .badges{display:flex;gap:8px}
  .badge{font-size:11px;padding:4px 10px;border-radius:4px;font-family:var(--mono)}
  .badge.ok{background:var(--accent-bg);color:var(--accent)}
  .badge.alarm{background:var(--danger-bg);color:var(--danger)}

  section{margin-bottom:28px}
  .section-title{font-size:13px;color:var(--text2);text-transform:uppercase;letter-spacing:.05em;margin-bottom:10px}
  .divider{border-top:1px solid var(--border);margin:8px 0 24px;padding-top:10px}
  .divider .section-title{margin-bottom:2px}
  .grid{display:grid;gap:10px}
  .grid.values{grid-template-columns:repeat(auto-fit,minmax(140px,1fr))}
  .grid.pumps{grid-template-columns:repeat(auto-fit,minmax(270px,1fr))}
  /* Site cards specifically need a capped max width — with only 1-2 sites provisioned,
     auto-fit's 1fr track would otherwise stretch a single card to the full page width. */
  #site-cards.grid.pumps{grid-template-columns:repeat(auto-fill,minmax(270px,340px))}

  .card{background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:14px 16px}
  .value-card .label{font-size:12px;color:var(--text2)}
  .value-card .num{font-family:var(--mono);font-size:24px;margin-top:4px}
  .value-card .num.danger{color:var(--danger)}

  .pump-card .head{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
  .pump-card .name{font-weight:600;font-size:14px}
  .pump-card .status{font-family:var(--mono);font-size:11px;padding:2px 8px;border-radius:3px}
  .pump-card .status.run{background:var(--accent-bg);color:var(--accent)}
  .pump-card .status.stop{background:var(--panel2);color:var(--text3)}
  .pump-row{font-size:12px;color:var(--text2);display:flex;justify-content:space-between;margin-top:4px}
  .pump-row span:last-child{font-family:var(--mono);color:var(--text)}
  .edit-link{margin-top:10px;background:var(--panel);border:1px solid var(--border);color:var(--accent);padding:5px 10px;border-radius:4px;font-size:12px;cursor:pointer;width:100%}
  .edit-link:hover{background:var(--accent-bg)}

  .field{margin-bottom:10px}
  .field label{display:block;font-size:11px;color:var(--text2);margin-bottom:4px}
  .field input,.field select{width:100%;background:var(--panel);border:1px solid var(--border);color:var(--text);padding:9px 10px;border-radius:4px;font-family:var(--mono);font-size:16px}
  .field input[type=text],.field input[type=number]{font-family:var(--mono)}
  .field input:focus,.field select:focus{outline:none;border-color:var(--accent)}
  .field .err{color:var(--danger);font-size:11px;margin-top:4px;display:none}
  .field.invalid input{border-color:var(--danger)}
  .field.invalid .err{display:block}
  .field-row{display:grid;grid-template-columns:1fr 1fr;gap:10px}
  .field-row3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px}
  .field-row4{display:grid;grid-template-columns:1fr 1fr 1fr 1fr;gap:10px}
  .field-row4 input{background:var(--panel);border:1px solid var(--border);color:var(--text);padding:9px 10px;border-radius:4px;font-family:var(--mono);font-size:16px;width:100%}
  @media(max-width:700px){.field-row4{grid-template-columns:1fr 1fr}}
  .apply-row{display:flex;gap:8px;margin-top:12px}
  .apply-row button{flex:1;padding:8px;border-radius:4px;font-size:13px;cursor:pointer;border:1px solid var(--border);background:var(--panel)}
  .btn-apply{background:var(--accent-bg);color:var(--accent);border-color:var(--accent)!important}
  .btn-cancel{background:var(--panel2);color:var(--text2)}
  .confirm{display:none;background:var(--warn-bg);border:1px solid var(--warn);color:var(--warn);font-size:12px;padding:8px 10px;border-radius:4px;margin-top:8px}
  .confirm.show{display:block}
  .confirm button{margin-top:6px;background:var(--warn);color:#fff;border:none;padding:5px 12px;border-radius:3px;cursor:pointer;font-size:12px;font-weight:600}

  .modegroup{padding:10px 12px;border-radius:6px;margin-bottom:10px;border:1px solid transparent}
  .modegroup .subhead{font-size:12px;color:var(--text2);text-transform:uppercase;letter-spacing:.04em;margin:0 0 8px}
  .modegroup.active{background:var(--accent-bg);border-color:var(--accent-border)}
  .modegroup.active .subhead{color:var(--accent);font-weight:600}

  .tank-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(90px,1fr));gap:8px;margin-bottom:14px}
  .tank-chip{background:var(--panel2);border:1px solid var(--border);border-radius:4px;padding:8px;text-align:center;font-size:12px}
  .tank-chip label{display:flex;align-items:center;justify-content:center;gap:6px;cursor:pointer}
  .manual-row{display:flex;gap:8px;align-items:center;margin-top:8px;flex-wrap:wrap}
  .btn-open{background:var(--accent-bg);color:var(--accent);border:1px solid var(--accent)}
  .btn-close{background:var(--danger-bg);color:var(--danger);border:1px solid var(--danger)}
  .flags{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
  .flag{font-family:var(--mono);font-size:11px;padding:3px 9px;border-radius:3px;background:var(--panel2);color:var(--text3)}
  .flag.on{background:var(--warn-bg);color:var(--warn)}
  .flag.active{background:var(--accent-bg);color:var(--accent)}

  table.io{width:100%;border-collapse:collapse;font-size:12px}
  table.io th{text-align:left;color:var(--text2);font-weight:500;padding:6px 8px;border-bottom:1px solid var(--border)}
  table.io td{padding:5px 8px;border-bottom:1px solid var(--border)}
  table.io input,table.io select{width:100%;background:var(--panel);border:1px solid var(--border);color:var(--text);padding:7px 8px;border-radius:3px;font-size:16px;font-family:var(--sans)}
  .io-tables{display:grid;grid-template-columns:1fr 1fr;gap:16px}
  @media(max-width:800px){.io-tables{grid-template-columns:1fr}}
  .used-by{font-size:11px;color:var(--text3);margin-top:4px}

  .alarm-row{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;border-bottom:1px solid var(--border);font-size:13px}
  .alarm-row:last-child{border-bottom:none}
  .alarm-row.active{background:var(--danger-bg)}
  .alarm-row .msg{color:var(--text)}
  .alarm-row.active .msg{color:var(--danger)}
  .alarm-row .state{font-family:var(--mono);font-size:11px;color:var(--text3)}
  .alarm-row.active .state{color:var(--danger)}
  .alarm-edit-btn{background:var(--panel);border:1px solid var(--border);color:var(--text2);padding:3px 8px;border-radius:3px;font-size:11px;cursor:pointer}
  .alarm-detail{padding:12px 14px;border-bottom:1px solid var(--border);background:var(--panel2);display:none}
  .alarm-detail.show{display:block}
  .chip-row{display:flex;gap:8px;flex-wrap:wrap}
  .chip{display:flex;align-items:center;gap:6px;font-size:12px;background:var(--panel);border:1px solid var(--border);padding:5px 10px;border-radius:14px;cursor:pointer}
  .chip input{margin:0}
  .swatch{width:9px;height:9px;border-radius:50%;display:inline-block}

  .layout{display:flex;gap:0;max-width:1600px;margin:0 auto}
  .sidebar{width:210px;flex:none;background:#152A4E;border-radius:10px;padding:14px 0;height:fit-content;position:sticky;top:70px}
  .sidebar .brand{color:#fff;font-weight:600;font-size:14px;padding:0 18px 14px;border-bottom:1px solid rgba(255,255,255,0.12);margin-bottom:6px}
  .navitem{display:flex;align-items:center;gap:10px;padding:9px 18px;color:#C9D6EC;font-size:13px;cursor:pointer;border-left:3px solid transparent;text-decoration:none}
  .navitem:hover{background:rgba(255,255,255,0.06)}
  .navitem.active{background:rgba(255,255,255,0.1);color:#fff;border-left-color:var(--nc,#2F6FED)}
  .navgroup{color:#7C90B5;font-size:10.5px;text-transform:uppercase;letter-spacing:.06em;padding:14px 18px 4px}
  .navdot{width:8px;height:8px;border-radius:50%;background:var(--nc,#2F6FED);flex:none}
  .subnav{padding-left:12px;margin:2px 0 6px}
  .subnav .navitem{padding:7px 14px;font-size:12.5px;color:#A9BBDA}
  .subnav .navitem.active{color:#fff}
  .content{flex:1;min-width:0;padding-left:28px}
  @media(max-width:860px){.layout{display:block}.sidebar{position:static;width:100%;margin-bottom:20px}.content{padding-left:0}}
  .range-row{display:flex;gap:6px;margin-bottom:12px}
  .range-btn{background:var(--panel);border:1px solid var(--border);color:var(--text2);padding:5px 12px;border-radius:14px;font-size:12px;cursor:pointer}
  .range-btn.active{background:var(--accent-bg);color:var(--accent);border-color:var(--accent)}

  .topnav{max-width:1600px;margin:0 auto 20px;display:flex;justify-content:space-between;align-items:center;padding-bottom:14px;border-bottom:1px solid var(--border)}
  .topnav .logo{font-weight:600;font-size:15px;color:var(--text)}
  .topnav .links{display:flex;gap:22px;font-size:13px;color:var(--text2)}
  .topnav .links a{color:var(--text2);text-decoration:none;cursor:pointer}
  .topnav .links a:hover{color:var(--accent)}
  .topnav .user{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text2)}
  .avatar{width:26px;height:26px;border-radius:50%;background:var(--accent-bg);color:var(--accent);display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:600}
  .breadcrumb{max-width:1600px;margin:0 auto 16px;font-size:12px;color:var(--text3)}
  .breadcrumb span.cur{color:var(--text)}

  /* ---- additional components for site-wide pages ---- */
  .hero{max-width:1600px;margin:0 auto 40px;padding:60px 20px;text-align:center}
  .hero h1{font-size:32px;margin:0 0 12px}
  .hero p{color:var(--text2);font-size:15px;max-width:560px;margin:0 auto}
  .photo-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;max-width:1600px;margin:0 auto 40px}
  .photo-card{aspect-ratio:4/3;background:var(--panel2);border:1px solid var(--border);border-radius:8px;display:flex;align-items:center;justify-content:center;color:var(--text3);font-size:12px}
  .mission{max-width:700px;margin:0 auto 40px;background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:28px;text-align:center}
  .footer{max-width:1600px;margin:40px auto 0;padding-top:20px;border-top:1px solid var(--border);color:var(--text3);font-size:12px;text-align:center}

  .badge.neutral{background:var(--panel2);color:var(--text3)}
  .badge.info{background:#E7EFFE;color:var(--accent)}
  .badge.warn{background:var(--danger-bg);color:var(--danger)}

  textarea.f{width:100%;background:var(--panel);border:1px solid var(--border);color:var(--text);padding:10px;border-radius:4px;font-family:var(--sans);font-size:16px}
  .search-bar{display:flex;gap:8px;max-width:640px;margin-bottom:20px}
  .search-bar input{flex:1;background:var(--panel);border:1px solid var(--border);color:var(--text);padding:10px 12px;border-radius:6px;font-size:16px}
  .search-bar button{background:var(--accent);border:none;color:#fff;padding:9px 18px;border-radius:6px;cursor:pointer;font-size:13px}

  .dropzone{border:1.5px dashed var(--border);border-radius:8px;padding:24px;text-align:center;color:var(--text3);font-size:13px;cursor:pointer}
  .dropzone:hover{border-color:var(--accent);color:var(--accent)}
  .file-row{display:flex;justify-content:space-between;align-items:center;padding:9px 4px;border-bottom:1px solid var(--border);font-size:13px}
  .file-row:last-child{border-bottom:none}
  .file-row .fname{display:flex;align-items:center;gap:8px}
  .file-actions{display:flex;gap:6px}
  .file-actions button{font-size:11px;padding:3px 9px;border-radius:3px;border:1px solid var(--border);background:var(--panel);color:var(--text2);cursor:pointer}

  .mini-cal{display:grid;grid-template-columns:repeat(7,1fr);gap:4px;font-size:11px}
  .mini-cal .d{aspect-ratio:1;display:flex;align-items:center;justify-content:center;border-radius:4px;background:var(--panel2);color:var(--text3);cursor:pointer}
  .mini-cal .d.has-event{background:var(--accent-bg);color:var(--accent);font-weight:600}
  .mini-cal .d.today{border:1.5px solid var(--accent)}

  .stat-row{display:flex;gap:20px;flex-wrap:wrap;margin-bottom:16px}
  .stat{font-family:var(--mono)}
  .stat .n{font-size:22px}
  .stat .l{font-size:11px;color:var(--text2);text-transform:uppercase;letter-spacing:.04em}

  .permission-note{font-size:12px;color:var(--text3);background:var(--panel2);border-radius:6px;padding:8px 12px;margin-bottom:16px}

  .report-editor{border:1px solid var(--border);border-radius:8px;padding:16px;margin-top:8px;background:var(--panel2)}
  .report-editor h4{margin:0 0 6px;font-size:13px;color:var(--text)}
  .report-editor .rsec{margin-bottom:14px}
  .report-editor textarea{width:100%;background:var(--panel);border:1px solid var(--border);color:var(--text);padding:10px;border-radius:4px;font-family:var(--sans);font-size:16px;line-height:1.5}
  .report-editor table.io{background:var(--panel);border-radius:4px;overflow:hidden}

  /* Mobile readability — bump the smallest text up so nothing needs a pinch-zoom to read,
     on top of the 16px form-field fix above (which stops iOS auto-zooming on tap). */
  @media(max-width:600px){
    body{font-size:15px}
    .section-title{font-size:14px}
    .field label{font-size:13px}
    .pump-row{font-size:13px}
    .value-card .label{font-size:13px}
    .value-card .num{font-size:26px}
    .file-row{font-size:14px}
    .alarm-row{font-size:14px}
    .permission-note{font-size:13px}
    .chip{font-size:13px}
    .updated{font-size:13px}
  }

  /* ================= Responsive: phone → desktop =================
     Desktop uses the full width of the window (no centred 1600px column); on a phone the sidebar becomes
     a slide-in menu behind a hamburger button, grids collapse to one column and wide tables scroll
     sideways inside their card instead of stretching the page. */
  html{-webkit-text-size-adjust:100%}
  img,canvas,video{max-width:100%}
  .layout,.topnav,.breadcrumb{max-width:none}
  .sidebar{max-height:calc(100vh - 90px);overflow-y:auto}
  .card{max-width:none!important}
  .navtoggle{display:none;background:var(--panel);border:1px solid var(--border);color:var(--text);width:40px;height:40px;border-radius:8px;font-size:20px;line-height:1;cursor:pointer;flex:none;padding:0}
  .nav-backdrop{display:none}
  .table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}

  @media(max-width:1100px){
    .field-row4{grid-template-columns:1fr 1fr}
  }
  @media(max-width:860px){
    body{padding:0 12px 24px}
    .topnav{position:sticky;top:0;z-index:900;background:var(--bg);margin:0 -12px 12px;padding:10px 12px;gap:10px}
    .topnav .links{display:none}
    .topnav .logo{flex:1}
    .navtoggle{display:block}
    .breadcrumb{margin-bottom:12px}
    .layout{display:block}
    /* the menu panel must be exactly as tall as the screen (the desktop rule height:fit-content let it grow past the
       bottom, so the last items were unreachable and nothing scrolled) and scroll inside itself */
    .sidebar{position:fixed;top:0;left:0;bottom:0;height:100vh;height:100dvh;width:272px;max-width:85vw;max-height:none;border-radius:0 12px 12px 0;z-index:1001;overflow-y:auto;overscroll-behavior:contain;-webkit-overflow-scrolling:touch;transform:translateX(-105%);transition:transform .2s ease,visibility 0s linear .2s;padding-top:18px;padding-bottom:calc(60px + env(safe-area-inset-bottom,0px));box-shadow:none;visibility:hidden}
    .sidebar.open{visibility:visible;transition-delay:0s}
    body.nav-open{overflow:hidden}
    .sidebar.open{transform:none;box-shadow:0 0 40px rgba(0,0,0,.35)}
    .navitem{padding:12px 18px}
    .subnav .navitem{padding:10px 14px}
    .nav-backdrop.show{display:block;position:fixed;inset:0;background:rgba(10,20,40,.45);z-index:1000}
    .content{padding-left:0}
    .card{padding:12px}
  }
  @media(max-width:700px){
    .field-row,.field-row3,.field-row4{grid-template-columns:1fr}
    .apply-row{max-width:none!important;flex-wrap:wrap}
    .apply-row button{min-height:40px}
    .topbar{margin-bottom:12px}
    .site-name{font-size:18px}
    .file-row{flex-wrap:wrap;gap:6px 10px}
    .file-row .fname{flex-wrap:wrap}
    .file-actions{flex-wrap:wrap}
    .file-actions button{padding:6px 12px;font-size:12px}
    .alarm-row{flex-wrap:wrap;gap:6px}
    .search-bar{max-width:none}
    .grid.values{grid-template-columns:1fr 1fr}
    .grid.pumps{grid-template-columns:1fr}
    #site-cards.grid.pumps{grid-template-columns:1fr}
    .stat-row{gap:14px}
    button,.btn-apply,.btn-cancel,.refresh-btn,.range-btn{min-height:36px}
    .chip{padding:7px 12px}
    /* data tables: scroll sideways inside the card rather than widen the page */
    .card:has(>table),.card:has(>div>table),.report-editor:has(table){overflow-x:auto;-webkit-overflow-scrolling:touch}
    table.io,table.labs,table.frd-table{min-width:520px}
    table.io.io-narrow{min-width:0}
    .io-tables table.io{min-width:0}
    .report-editor{padding:12px}
  }
  @media(max-width:420px){
    body{font-size:14.5px}
    .value-card{padding:10px 12px}
    .value-card .num{font-size:20px;overflow-wrap:anywhere}
  }

  /* ---- checklist rows & segmented Y/N/N/A choices (replace loose radio buttons) ---- */
  .check-row{display:flex;justify-content:space-between;align-items:center;gap:10px 16px;padding:9px 2px;border-bottom:1px solid var(--border);font-size:13px}
  .check-row:last-child{border-bottom:none}
  .check-row .q{flex:1;min-width:0;color:var(--text)}
  .seg{display:inline-flex;flex:none;border:1px solid var(--border);border-radius:8px;overflow:hidden;background:var(--panel)}
  .seg label{display:flex!important;gap:0!important;margin:0;cursor:pointer;position:relative}
  .seg label+label{border-left:1px solid var(--border)}
  .seg input{position:absolute;opacity:0;inset:0;width:100%;height:100%;margin:0;cursor:pointer}
  .seg span{display:block;flex:1;min-width:46px;padding:7px 12px;text-align:center;font-size:13px;font-weight:600;color:var(--text2);user-select:none}
  .seg input:checked+span{color:#fff}
  .seg label.y input:checked+span{background:#3FA35E}
  .seg label.n input:checked+span{background:var(--danger)}
  .seg label.na input:checked+span{background:#8C99AA}
  .seg input:focus-visible+span{outline:2px solid var(--accent);outline-offset:-2px}
  .tick-row{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
  .tick{display:inline-flex;align-items:center;gap:8px;margin:0;cursor:pointer}
  .ppe-item{display:flex;align-items:center;justify-content:space-between;gap:10px 16px;background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:8px 12px}
  .ppe-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:8px}
  .ppe-item .tick-main{font-size:13px;color:var(--text)}
  .ppe-item .tick-na{font-size:12px;color:var(--text3);padding-left:12px;border-left:1px solid var(--border)}

  @media(max-width:700px){
    /* checkboxes / radios: big enough to hit with a thumb, and always vertically centred on their label */
    input[type=checkbox],input[type=radio]{width:20px;height:20px;flex:none;margin:0;accent-color:var(--accent)}
    .chip{gap:8px;line-height:1.3;border-radius:10px;align-items:flex-start;padding:8px 12px}
    .chip input[type=checkbox],.chip input[type=radio]{margin-top:1px}
    .chip-row{gap:8px}
    label:has(>input[type=checkbox]),label:has(>input[type=radio]){display:inline-flex;align-items:center;gap:8px}
    .check-row{flex-direction:column;align-items:stretch;gap:8px;padding:12px 2px}
    .check-row .seg{width:100%}
    .check-row .seg label{flex:1}
    .check-row .seg span{padding:10px 8px;font-size:14px}
    .ppe-grid{grid-template-columns:1fr}
    .ppe-item{padding:10px 12px}
  }