*{box-sizing:border-box;margin:0;padding:0}
body{font-family:Arial,sans-serif;background:#f4f5f7;color:#111;min-height:100vh}

/* ── Nav ───────────────────────────────────────────────────────────────────── */
nav{background:#fff;border-bottom:1px solid #e0e0e0;padding:0 20px;height:52px;
    display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100}
.brand{font-weight:600;font-size:15px;color:#111;text-decoration:none;letter-spacing:-.01em}
.nav-right{display:flex;align-items:center;gap:20px;font-size:13px}
.nav-right a{color:#555;text-decoration:none}
.nav-right a:hover{color:#111}
.nav-user{color:#aaa}

/* ── Page ───────────────────────────────────────────────────────────────────── */
.page{max-width:860px;margin:0 auto;padding:24px 16px}

/* ── Flash ──────────────────────────────────────────────────────────────────── */
.alert{background:#fffbe6;border:1px solid #f0d060;border-radius:8px;
       padding:10px 14px;margin-bottom:16px;font-size:13px}

/* ── Login ──────────────────────────────────────────────────────────────────── */
.login-wrap{max-width:360px;margin:60px auto;background:#fff;border-radius:14px;
            padding:36px 32px;border:1px solid #e0e0e0}
.login-wrap h1{font-size:19px;text-align:center;margin-bottom:6px;font-weight:600}
.login-wrap .subtitle{font-size:12px;color:#aaa;text-align:center;margin-bottom:28px}
.login-wrap label{display:block;font-size:11px;color:#888;margin-bottom:4px;margin-top:14px;
                  text-transform:uppercase;letter-spacing:.06em;font-weight:600}
.login-wrap input{width:100%;border:1px solid #ddd;border-radius:8px;padding:10px 12px;
                  font-size:14px;outline:none;transition:border-color .15s}
.login-wrap input:focus{border-color:#555}
.login-wrap button{margin-top:24px;width:100%;background:#111;color:#fff;border:none;
                   border-radius:8px;padding:12px;font-size:14px;cursor:pointer;font-weight:500}
.login-wrap button:hover{background:#333}

/* ── Typography ─────────────────────────────────────────────────────────────── */
.stitle{font-size:11px;font-weight:600;color:#888;text-transform:uppercase;
        letter-spacing:.07em;margin:22px 0 8px}
h2{font-size:18px;font-weight:500;margin-bottom:20px}
.top-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;gap:12px;flex-wrap:wrap}
.top-bar h2{margin-bottom:0}
.back{font-size:13px;color:#888;text-decoration:none;display:inline-flex;
      align-items:center;gap:4px;margin-bottom:12px}
.back:hover{color:#111}

/* ── PLC grid ───────────────────────────────────────────────────────────────── */
.plc-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px;margin-bottom:8px}
.plc-card{background:#fff;border:1px solid #e0e0e0;border-radius:12px;padding:18px 16px;
          text-decoration:none;color:#111;display:block;transition:box-shadow .15s,border-color .15s}
.plc-card:hover{box-shadow:0 2px 10px rgba(0,0,0,.08);border-color:#ccc}
.plc-card.add-card{border-style:dashed;color:#aaa;display:flex;align-items:center;
                   justify-content:center;font-size:13px;min-height:72px}
.plc-card.add-card:hover{color:#555;border-color:#999}
.plc-name{font-size:14px;font-weight:500;margin-bottom:4px}
.plc-desc{font-size:12px;color:#999}

/* ── Status pills ───────────────────────────────────────────────────────────── */
.sbar{display:flex;gap:8px;margin-bottom:20px;flex-wrap:wrap}
.pill{display:flex;align-items:center;gap:7px;padding:8px 12px;border-radius:20px;
      border:1px solid #e0e0e0;background:#fff}
.dot{width:12px;height:12px;border-radius:50%;flex-shrink:0;background:#d0d0d0;transition:background .3s}
.dot.ok{background:#3B6D11}
.dot.ko{background:#A32D2D}
.pill-label{font-size:11px;color:#999;white-space:nowrap}
.pill-val{font-size:12px;font-weight:500;color:#111;white-space:nowrap}

/* ── Sensor cards ───────────────────────────────────────────────────────────── */
.sensor-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:10px}
.card{background:#fff;border:1px solid #e0e0e0;border-radius:12px;padding:16px}
.ctitle{font-size:11px;color:#999;margin-bottom:10px;text-transform:uppercase;letter-spacing:.04em;
        white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mval{font-size:30px;font-weight:500;line-height:1;color:#111}
.munit{font-size:12px;color:#aaa;margin-top:4px}

/* ── Buttons ────────────────────────────────────────────────────────────────── */
.btn{display:inline-block;padding:8px 16px;border-radius:8px;border:1px solid transparent;
     cursor:pointer;font-size:13px;text-decoration:none;font-family:inherit;
     transition:opacity .15s;white-space:nowrap}
.btn:hover{opacity:.82}
.btn-primary{background:#111;color:#fff}
.btn-secondary{background:#fff;color:#111;border-color:#ddd}
.btn-danger{background:#A32D2D;color:#fff}
.btn-sm{padding:5px 10px;font-size:12px}

/* ── Tables ─────────────────────────────────────────────────────────────────── */
.table-wrap{background:#fff;border:1px solid #e0e0e0;border-radius:12px;
            overflow:hidden;margin-bottom:20px;overflow-x:auto}
table{width:100%;border-collapse:collapse;min-width:420px}
th{text-align:left;font-size:11px;font-weight:600;color:#888;text-transform:uppercase;
   letter-spacing:.06em;padding:10px 16px;border-bottom:1px solid #ebebeb}
td{padding:10px 16px;font-size:13px;border-bottom:1px solid #f2f2f2;vertical-align:middle}
tr:last-child td{border-bottom:none}
.tag{display:inline-block;padding:2px 8px;border-radius:10px;font-size:11px;font-weight:500}
.tag-admin{background:#f0ede8;color:#7a5c30}
.tag-user{background:#eef2ee;color:#3B6D11}

/* ── Forms ──────────────────────────────────────────────────────────────────── */
.form-box{background:#fff;border:1px solid #e0e0e0;border-radius:12px;padding:20px;margin-bottom:18px}
.form-box h3{font-size:11px;font-weight:600;color:#888;text-transform:uppercase;
             letter-spacing:.07em;margin-bottom:16px}
.form-group{margin-bottom:14px}
.form-group label{display:block;font-size:11px;color:#888;text-transform:uppercase;
                  letter-spacing:.06em;margin-bottom:4px;font-weight:600}
.form-group input,.form-group select{width:100%;border:1px solid #ddd;border-radius:8px;
                                     padding:9px 11px;font-size:14px;outline:none;
                                     background:#fff;font-family:inherit}
.form-group input:focus,.form-group select:focus{border-color:#555}
.form-group small{font-size:11px;color:#aaa;margin-top:3px;display:block}
.form-row{display:flex;gap:12px}
.form-row .form-group{flex:1;min-width:0}

/* ── Stats ──────────────────────────────────────────────────────────────────── */
.stats-bar{display:flex;gap:12px;margin-bottom:24px;flex-wrap:wrap}
.stat{background:#fff;border:1px solid #e0e0e0;border-radius:10px;
      padding:14px 16px;flex:1;text-align:center;min-width:80px}
.stat-n{font-size:26px;font-weight:500}
.stat-l{font-size:11px;color:#aaa;margin-top:2px;text-transform:uppercase;letter-spacing:.06em}
.stat.warn .stat-n{color:#A32D2D}
.stat.warn .stat-l{color:#c05040}

/* ── Unregistered PLCs alert ────────────────────────────────────────────────── */
.alert-warn{background:#fffbe6;border:1px solid #f0d060;border-radius:10px;
            padding:14px 16px;margin-bottom:20px}
.alert-warn h4{font-size:13px;font-weight:600;color:#7a5c30;margin-bottom:10px}
.unreg-row{display:flex;align-items:center;gap:10px;padding:7px 0;
           border-bottom:1px solid #f0e8c0;flex-wrap:wrap}
.unreg-row:last-child{border-bottom:none}
.unreg-name{font-size:13px;font-weight:500;flex:1;min-width:120px}
.unreg-meta{font-size:12px;color:#aaa}

/* ── Chips (suggestions) ────────────────────────────────────────────────────── */
.chip-row{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px}
.chip{display:inline-flex;align-items:center;gap:5px;padding:5px 10px;border-radius:16px;
      border:1px solid #d0d0d0;background:#f8f8f8;cursor:pointer;font-size:12px;
      font-family:inherit;transition:background .15s,border-color .15s;white-space:nowrap}
.chip:hover{background:#ececec;border-color:#aaa}
.chip .meta{color:#aaa;font-size:11px}

/* ── Misc ───────────────────────────────────────────────────────────────────── */
.empty{color:#aaa;font-size:14px;text-align:center;padding:40px 0}
.plant-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;flex-wrap:wrap;gap:10px}
.plant-header h1{font-size:22px;font-weight:500}

/* ── Dipòsit (water tank, estil webserver.cpp) ──────────────────────────────── */
.trow{display:flex;align-items:center;gap:14px}
.twrap{position:relative;width:60px;height:76px;border:1.5px solid #ccc;
       border-radius:4px;overflow:hidden;flex-shrink:0}
.water{position:absolute;bottom:0;left:0;right:0;background:#378ADD;transition:height .6s ease}
.wpct{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
      font-size:12px;font-weight:600;color:#fff;text-shadow:0 1px 2px rgba(0,0,0,.35)}

/* ── Checkboxes PLCs en formulari d'usuari ───────────────────────────────────── */
.plc-check-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:6px;margin-top:6px}
.plc-check{display:flex;align-items:flex-start;gap:8px;padding:8px 10px;border:1px solid #e8e8e8;
           border-radius:8px;cursor:pointer;transition:background .12s}
.plc-check:hover{background:#f8f8f8}
.plc-check input[type=checkbox]{margin-top:2px;flex-shrink:0;accent-color:#111}
.plc-check-name{font-size:13px;font-weight:500}
.plc-check-desc{font-size:11px;color:#aaa;display:block}

/* ── Mobile ─────────────────────────────────────────────────────────────────── */
@media (max-width:640px){
  nav{padding:0 12px}
  .nav-right{gap:14px;font-size:12px}
  .brand{font-size:14px}
  .page{padding:16px 10px}
  h2{font-size:16px}
  .plant-header h1{font-size:18px}
  .stats-bar{gap:8px}
  .stat{min-width:calc(50% - 8px);flex:none;padding:12px}
  .stat-n{font-size:22px}
  .form-row{flex-direction:column;gap:0}
  .top-bar{flex-direction:row}
  .plc-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px}
  .sensor-grid{grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:8px}
  .mval{font-size:26px}
  .sbar{gap:6px}
  .pill{padding:7px 10px}
  .unreg-row{gap:8px}
  .login-wrap{margin:30px auto;padding:28px 20px}
}
@media (max-width:380px){
  .plc-grid{grid-template-columns:1fr 1fr}
  .sensor-grid{grid-template-columns:1fr 1fr}
  .stats-bar{gap:6px}
}