/* ---------------GENERAL STYLE ----------*/

:root {
    --color-bg-primary: #00004b;
    --color-bg-secondary: #f9fafb;
    --color-bg-white: #ffffff;
    --color-button-primary: #0067e6;
    --color-button-active: #00004b;
    --color-button-disabled: #f5f5f5;
    --color-button-gray: #ececf0;
    --color-button-hover: #348dda;
    --color-input-gray: #ececf0;
    --color-card-bg: #e5e6ec;
    --color-text-white: #ffffff;
    --card-border-radius: 4px;
    --box-shadow: 0px 2px 0px 0px #00000024;
}

* {
    box-sizing: border-box;
    font-family: "Roboto", Arial, Helvetica, sans-serif;
    margin: 0;
    padding: 0;
}

html, body {
    overflow-x: hidden;
}
button {
    cursor: pointer;
    transition: background-color 0.2s ease;
}

/* Global button hover - light blue for all buttons (only on devices with hover support) */
@media (hover: hover) {
    button:hover:not(:disabled) {
        background-color: var(--color-button-hover) !important;
        color: var(--color-text-white) !important;
    }
}

button,
input,
.card,
.configuration-wrapper,
.card-data-content,
#dl_zone {
    border-radius: var(--card-border-radius);
    border: none;
}

    .card > div {
        display: flex;
        flex-direction: column;
        align-items: center;
        overflow: auto;
        gap: 10px;
    }

.wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header,
footer {
    color: var(--color-text-white);
    background-color: var(--color-bg-primary);
}

/* ---------------HEADER STYLE ----------*/

header {
    height: 88px;
    display: flex;
    align-items: center;
    flex-direction: column;
    justify-content: center;
    padding: 0 20px;
}

    header nav {
        width: 100%;
        display: flex;
        align-items: center;
        justify-content: space-between;
        font-weight: 700;
    }

        header nav p {
            font-size: 1.3rem;
        }

        header nav span {
            font-weight: 300;
        }

        header nav object {
            width: 170px;
            height: 18px;
        }

        header nav button {
            background-color: var(--color-button-primary);
            color: var(--color-text-white);
            padding: 13px 24px;
            text-transform: uppercase;
        }

.connectedDevice {
    text-align: center;
    font-size: 1rem;
    font-weight: bold;
}

/* ---------------MAIN STYLE ----------*/
main {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: var(--color-bg-secondary);
    padding: 20px 0;
}

    main .main-content {
        width: 100%;
        max-width: 940px;
        display: flex;
        flex-direction: column;
        align-items: center;
        padding: 0 15px;
        box-sizing: border-box;
       /* gap: 20px;*/
        /* min-height: 100vh; */
    }

        /* ----------------cards----------------- */

        main .main-content .card-wrapper {
            width: 100%;
            max-width: 940px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: center;
            gap: 20px;
            margin-bottom: 5px;
        }

            main .main-content .card-wrapper .card {
                width: 100%;
                max-width: 450px;
                min-width: 280px;
                flex: 1 1 280px;
                height: auto;
                min-height: 148px;
                display: flex;
                flex-direction: column;
                align-items: center;
                justify-content: center;
                text-align: center;
                padding: 16px;
                background: var(--color-bg-white);
                border: 1px solid #e7e8e9;
                box-shadow: var(--box-shadow);
            }

                main .main-content .card-wrapper .card button {
                    padding: 8px 16px;
                    background-color: var(--color-button-primary);
                    color: var(--color-text-white);
                    margin-left: 20px;
                    /*flex-direction: row;*/
                }
                main .main-content .card-wrapper .card button:disabled {
                    padding: 8px 16px;
                    background: var(--color-button-disabled);
                    color: #00004b42;
                    flex-direction: row;
                }

                main .main-content .card-wrapper .card .button-group {
                    display: flex;
                    flex-direction: row;
                    gap: 10px;
                    flex-wrap: wrap;
                    justify-content: center;
                  }

                main .main-content .card-wrapper .card span {
                    display: block;
                    font-weight: 300;
                }

                main .main-content .card-wrapper .card .displayNone {
                    display: none;
                }

        /* ----------------config buttons----------------- */
        main .main-content .configuration-wrapper {
            width: 100%;
            max-width: 918px;
            display: flex;
            flex-direction: column;
            background: var(--color-bg-white);
            border: 1px solid #e7e8e9;
            gap: 20px;
            padding: 10px;
            box-shadow: var(--box-shadow);
            box-sizing: border-box;
            margin-top: 10px;
        }

            main .main-content .configuration-wrapper .btn-wrapper {
                display: flex;
                flex-wrap: wrap;
                justify-content: center;
                gap: 20px;
                padding: 10px;
            }

            main .main-content .configuration-wrapper .btn-wrapper-align-start {
                display: flex;
                justify-content: start;
                gap: 10px;
                padding: 10px;
                flex-wrap: wrap;
            }



            /*main .main-content .configuration-wrapper.probe-type-dropdown {
                margin-left: 10px;  Adds spacing to the dropdown 
            }*/

                /* --------disable/unable config buttons-------------- */
                main .main-content .configuration-wrapper .btn-wrapper-align-start button:disabled {
                    padding: 8px 16px;
                    background: var(--color-button-disabled);
                    color: #00004b42;
                }

                main .main-content .configuration-wrapper .btn-wrapper-align-start > div button:disabled {
                    padding: 8px 16px;
                    background: var(--color-button-disabled);
                    color: #00004b42;
                }

                main .main-content .configuration-wrapper .btn-wrapper-align-start > div button {
                    padding: 8px 16px;
                    background: var(--color-button-gray);
                    color: black;
                    font-weight: 600;
                }

                main .main-content .configuration-wrapper .btn-wrapper-align-start button {
                    padding: 8px 16px;
                    background: var(--color-button-active);
                    color: var(--color-bg-white);
                }
                /* ------------------------------------------------------- */
                main .main-content .configuration-wrapper .btn-wrapper > div,
                main .main-content .configuration-wrapper .btn-wrapper-align-start > div {
                    display: flex;
                    align-items: center;
                    gap: 5px;
                }

                main .main-content .configuration-wrapper .btn-wrapper-align-start input {
                    background-color: var(--color-input-gray);
                    padding: 8px 8px 8px 12px;
                }

            main .main-content .configuration-wrapper .btn-wrapper-flex-column {
                display: flex;
                flex-wrap: wrap;
                gap: 20px;
                padding: 10px;
            }

                main .main-content .configuration-wrapper .btn-wrapper-flex-column > div {
                    flex: 1 1 100px;
                    min-width: 100px;
                }

                main .main-content .configuration-wrapper .btn-wrapper-flex-column label {
                    font-size: 0.8rem;
                    font-weight: bold;
                }

                main .main-content .configuration-wrapper .btn-wrapper-flex-column input {
                    width: 100%;
                    background-color: var(--color-input-gray);
                    padding: 8px 8px 8px 12px;
                    margin-top: 5px;
                }

/* ----------------data zone style----------------- */
.data-zone-wrapper {
    width: 100%;
    max-width: 918px;
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    box-sizing: border-box;
    align-items: stretch; /* Both columns same height on wide screens */
}

.data-zone-graph {
    width: 100%;
    max-width: 918px;
    height: auto;
    overflow: hidden;
    padding: 10px;
    margin: 10px 0;
    box-sizing: border-box;
}

.data-zone-gray {
    width: 100%;
    flex: 1 1 280px;
    min-width: 280px;
    padding: 10px;
    margin: 10px 0;
    box-shadow: var(--box-shadow);
    box-sizing: border-box;
}

.data-zone-settings {
    display: flex;
    flex-direction: column;
    gap: 10px;                         /* Tighter spacing for compact look */
    padding: 10px;
    margin: 10px 0;
    box-shadow: var(--box-shadow);
    background: var(--color-bg-white);
    border: 1px solid #e7e8e9;
    flex: 0 1 auto;                    /* Don't grow, shrink if needed, size based on content */
    min-width: 280px;
    max-width: 450px;
    width: 100%;
    box-sizing: border-box;
    border-radius: 4px;
    height: auto;                      /* Height based on content */
}

/* Container that holds multiple stacked data-zone-settings (acts as a column) */
.data-zone-settings:has(> .data-zone-settings) {
    background: transparent;
    border: none;
    box-shadow: none;
    padding: 0;
    margin: 10px 0;
    gap: 15px;
}

/* Nested boxes inside a container column */
.data-zone-settings > .data-zone-settings {
    flex: 0 0 auto;                    /* No grow, size to content */
    max-width: 100%;
    margin: 0;
}

/* First-level children in wrapper: two-column layout on wide screens */
.data-zone-wrapper > .data-zone-settings {
    flex: 1 1 280px;                   /* Grow to fill available space */
    max-width: 450px;
}

/* ─────────────  Full-width data zone (e.g. Vehicle info)  ───────────── */
.data-zone-wrapper > .data-zone-full-width {
    flex: 1 1 100%;                    /* Take full row width */
    max-width: 100%;                   /* Expand to wrapper's max (918px) */
    width: 100%;
}

.data-zone-settings .btn-wrapper-align-start button {
    padding: 8px 16px;
    background: var(--color-button-active);
    color: var(--color-bg-white);
    /*font-weight: 600;*/
    border: none;
    border-radius: var(--card-border-radius);
    margin:4px;
    min-width: 80px;
}
.data-zone-settings .btn-wrapper-align-start button:disabled {
    padding: 8px 16px;
    background: var(--color-button-disabled);
    color: #00004b42;
    /*font-weight: 600;*/
    border: none;
    border-radius: var(--card-border-radius);
    margin:4px;
    min-width: 80px;
}

/* ──── Calibrator button colour states ──── */
.data-zone-settings .btn-wrapper-align-start .state-btn           { color: var(--color-text-white); }
.data-zone-settings .btn-wrapper-align-start .state-btn.off       { background:#c62828; }    /* red  */
.data-zone-settings .btn-wrapper-align-start .state-btn.on        { background:#2e7d32; }    /* green*/
.data-zone-settings .btn-wrapper-align-start .state-btn.disabled  { background:var(--color-button-disabled); color:#00004b42;          }


.data-zone-settings .btn-wrapper-align-start .button-light-blue {
    padding: 8px 16px;
    background-color: var(--color-button-primary);
    color: var(--color-text-white);
    /*font-weight: 600;*/
    border: none;
    border-radius: var(--card-border-radius);
    margin-left: auto;
}
.data-zone-settings .btn-wrapper-align-start .button-light-blue button:disabled {
    padding: 8px 16px;
    background: var(--color-button-disabled);
    color: #00004b42;
    /*font-weight: 600;*/
    border: none;
    border-radius: var(--card-border-radius);
    margin-left: auto;
}

.data-zone-settings .btn-wrapper-align-start .button-status button:disabled {
    background-color: #ffcccc;
    border: 1px solid #ff0000;
    color: rgb(153, 0, 0);
    padding: 5px;
    margin: 5px 0;
    border-radius: 5px;
    text-align: center;
}

.data-zone-settings .btn-wrapper-align-start .button-status {
    background-color: #cfffcc;
    border: 1px solid #33ff00;
    color: rgb(28, 153, 0);
    padding: 5px;
    margin: 5px 0;
    border-radius: 5px;
    text-align: center;
}



.data-zone-settings .btn-wrapper-align-start input {
    background-color: var(--color-input-gray);
    padding: 8px 16px;
    margin: 4px 4px;
    width: 5em;
}

/* Epsilon probe controls wrapper */
.data-zone-settings .epsilon-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.data-zone-settings .btn-wrapper-align-start-AC input {
    background-color: var(--color-input-gray);
    padding: 8px 16px;
    margin: 4px 4px;
    width: 5em;
}

.data-zone-settings table {
    width: 100%;
    border-collapse: collapse;
    border: 1px solid #000000;
    margin-bottom: 10px;
    table-layout: fixed;
    font-size: 1rem; /* Larger base font */
}

.data-zone-settings table th,
.data-zone-settings table td {
    border: 1px solid #000000;
    padding: 5px;
    text-align: left;
    font-family: monospace; /* Keeps numeric alignment */
    height: 30px; /* Same height for all rows including header */
    line-height: 1.2;
    vertical-align: middle;
    font-size: 1rem; /* Ensures same size as table */
}

.data-zone-settings table th {
    background-color: #f1f1f1;
    font-weight: bold;
    text-align: left;
}
.data-zone-settings h3 {
    margin: 0;
    padding: 5px 0;
}

.data-zone-settings .btn-wrapper-flex-column {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    padding: 10px;
}

.data-zone-settings .btn-wrapper-flex-column input {
    width: 100%;
    background-color: var(--color-input-gray);
    padding: 8px 8px 8px 12px;
    margin-top: 5px;
}

.data-zone-settings .btn-wrapper-flex-column label {
    font-size: 0.8rem;
    font-weight: bold;
}

.data-zone-settings .btn-wrapper-align-start .button-light-blue-connect {
    padding: 8px 16px;
    background-color: var(--color-button-primary);
    color: var(--color-text-white);
    /*font-weight: 600;*/
    border: none;
    border-radius: var(--card-border-radius);
    
}
.data-zone-settings .btn-wrapper-align-start .button-light-blue-connect button:disabled {
    padding: 8px 16px;
    background: var(--color-button-disabled);
    color: #00004b42;
    /*font-weight: 600;*/
    border: none;
    border-radius: var(--card-border-radius);
    
}



.data-zone-gray,
.data-zone-graph {
    background-color: var(--color-bg-white);
    border-radius: 4px;
    border: 1px solid rgba(204, 204, 204, 1);
    box-shadow: var(--box-shadow);
}

.card-wrapper .card.data div button {
    background: var(--color-button-gray);
    color: black;
    font-weight: 600;
}
.card-wrapper .card.data div button:disabled {
    background: var(--color-button-disabled);
    color: #00004b42;
}

.error-box {
    background-color: #ffcccc;
    border: 1px solid #ff0000;
    color: #900;
    padding: 5px;
    margin: 5px 0;
    border-radius: 5px;
    text-align: center;
}

.error-zone {
    margin-top: 10px;
    padding: 5px;
    border: 1px dashed #ccc;
}

.levelMeterContainer {
    overflow: hidden;
    
    margin: auto;
  }

.graph-wrapper-align-start {
    display: flex;
    flex-wrap: wrap;
    justify-content: center; /* centers children horizontally */
    align-items: center;     /* centers children vertically if needed */
    gap: 40px;               /* optional: adds space between graphs */
  }

.flex-config-wrapper {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    gap: 15px;

    background: var(--color-bg-white);
    border: 1px solid #e7e8e9;
    padding: 10px;
    box-shadow: var(--box-shadow);
    width: 100%;
    max-width: 918px;
    flex-wrap: wrap;
    box-sizing: border-box;
}

/* ---------------MAIN STYLE END----------*/

/* ---------------FOOTER STYLE ----------*/
footer {
    margin-top: auto;
    padding: 10px;
}

    footer div {
        font-size: 0.8rem;
        text-align: center;
    }
    footer div .current_version {
        float: right;
    }

    #levelMeterContainer {
        overflow: hidden; /* This will remove horizontal and vertical scrollbars */
      }


      /* ---------- Spinner Styles ---------- */
    .spinner {
    border: 2px solid #f3f3f3;        /* light gray background ring */
    border-top: 2px solid #000000;    /* black spinning top */
    border-radius: 50%;
    width: 16px;
    height: 16px;
    animation: spin 1.0s linear infinite;
    display: inline-block;
    vertical-align: middle;
    margin-left: 8px;
    }

  @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }

  .spinner-inline{
    border:2px solid #f3f3f3;
    border-top:2px solid #000;
    border-radius:50%;
    width:14px;height:14px;
    animation:spin 1s linear infinite;
    display:inline-block;
    vertical-align:middle;
    margin-left:6px;
  }
  @keyframes spin{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}

  /* ---- FSM status colours ---- */
.status-idle      { background:#CCCCCC !important; color:#000; }
.status-fast      { background:#2e7d32 !important; }   /* green  */
.status-slow      { background:#76b041 !important; }   /* lime   */
.status-settling  { background:#ffba08 !important; }   /* amber  */
.status-paused    { background:#03a9f4 !important; }   /* light‑blue */
.status-done      { background:#3ab7b1 !important; }   /* purple */
.status-error     { background:#c62828 !important; }   /* red    */


#CalStatus {
    position:relative;
    
}
#CalStatus.status-settling{
    padding-right: 40px;  /* 26-px ring + 10-px gap */
  }

.settle-ring {
  position:absolute; top:50%; right:8px;
  transform: translateY(-50%) rotate(0deg);
  width:26px; height:26px;
  border-radius:50%;
  display:none; pointer-events:none;
    right:15px;
    left: 115px;

  /* progress fraction (1→0) */
  --p:1;
  background:
    conic-gradient(#5a3300 calc(var(--p)*1turn), transparent 0);

  /* hollow centre */
  mask:
    radial-gradient(farthest-side,#68540400 calc(100% - 3px),#000 0);
  -webkit-mask:inherit;

  transition: background .25s linear;
}

/* generic inputs – but SKIP check-boxes
.btn-wrapper-align-start input:not([type="checkbox"]) {
    background-color: var(--color-input-gray);
    padding: 8px 16px;
    margin: 4px 4px;
    width: 8em;
  }
 */
  /* generic inputs – but SKIP check-boxes */
.btn-wrapper-align-start input:not([type="checkbox"]) {
    background-color: var(--color-input-gray);
    padding: 8px 16px;
    margin: 4px 4px;
    width: 8em;
  }
  
  /* tidy pump check-box + label */
  .pump-option{
    display:inline-flex;
    align-items:center;
    gap:6px;           /* space between the box and the word "Pump" */
    font-weight:600;   /* optional – match button text weight */
  }
  
  /* make sure the little box itself isn't stretched */
  .pump-option input[type="checkbox"]{
    width:auto;
    height:auto;
    margin:0;
    padding:0;
  }

 .pump-option input[type="radio"]{
    width:auto;
    height:auto;
    margin-left:0px;
    padding:0;
  }

  /* ──────────────────────────────────────────────
   Bigger "Send command" inputs (BT45 + Calibrator)
   ‑ put this near the bottom of style.css
   ──────────────────────────────────────────────*/
#cmd,
#cmd2 {
    width: 15em;          /* ≈ 300 px – tweak to taste (e.g. 30em or 100%) */
    max-width: 100%;      /* prevents overflow on narrow screens          */
    flex: 1 1 auto;       /* lets them stretch/shrink nicely in the flex  */
}


/* ───────────────────  Tank/vehicle form layout  ────────────────────*/
.tank-info {                       /* the wrapper <div> */
    display: grid;                   /* 2-column grid      */
    grid-template-columns: 160px 1fr;/* 160 px label + flex-width input */
    column-gap: 12px;                /* space between the columns       */
    row-gap: 8px;                    /* vertical breathing space        */
    align-items: center;             /* vertically centre label/input   */
  }
  /*
  .tank-info label {
    font-weight: 600;                /* keep your existing look-&-feel  
  }
  */
  .tank-info input[type="text"] {
    width: 70%;                     /* stretch to the right edge       */
    max-width: 300px;                /* …but never wider than 320 px     */
  }

  /* ─── Keep status-button text white, even when disabled ─── */
button.state-btn,
button.state-btn:disabled,
button.status-idle,
button.status-fast,
button.status-slow,
button.status-settling,
button.status-paused,
button.status-done,
button.status-error,
button.status-idle:disabled,
button.status-fast:disabled,
button.status-slow:disabled,
button.status-settling:disabled,
button.status-paused:disabled,
button.status-done:disabled,
button.status-error:disabled {
    color: var(--color-text-white) !important;
}


/* ─────────────  Calibration Status – tidy grid  ───────────── */
.cal-status-grid{
    /* four neat columns: label | field | btn | field */
    display:grid;
    /*grid-template-columns: 40px minmax(0,1fr) max-content minmax(0,1fr);
    column-gap:8px;*/
    grid-template-columns:max-content 7em max-content 7em;
    column-gap:6px;          /* narrower gap → Zero sits closer */
    row-gap:8px;
    align-items:center;
    
    
}

/* keep inputs comfortable but not huge */
.cal-status-grid input[type="text"],
.cal-status-grid input[type="number"]{
    width:100%;          /* fill their grid cell           */
    max-width:auto;       /* ≈ 150 px – tune to taste       */
    padding:8px 12px;     /* matches earlier form styling   */
}

#CalStatus,
#targetNext{
    width:100%;              /* stretch to the column's width    */
    min-width:11em;          /* ≈ width of the blue status btn   */

}

/* Tank-selector visual states */
button.selected-tank:disabled, /* More specific selector */
button.selected-tank[disabled] /* More specific selector for older browser compatibility */
 {
    background: #348dda77 !important; /* Very light blue-grey */
    color: var(--color-bg-primary) !important; /* Dark blue text for contrast */
    outline: 3px solid var(--color-bg-primary); /* thick blue outline = "current" */
  }

/* Settings-mode selector – mimic tank selected style */
.settings-selected {
  background: #348dda77 !important;
  color: var(--color-bg-primary) !important;
  outline: 3px solid var(--color-bg-primary);
}

  /* ───────── Tank-selector fixes (tank1 / tank2) ───────── */
#tank1, #tank2 {
    /*margin-left: 0 !important;       undo the 144 px offset that caused wrapping   */
    min-width: 80px;               /* freeze width so the row never re-flows       */
    margin: 4px; 
  }


  
  /* uns-selected (clickable) tank = dark navy; keep existing text colour */
  #tank1.button-light-blue,
  #tank2.button-light-blue {
    background-color: var(--color-bg-primary) !important;  /* #00004b */
    color: var(--color-text-white);
  }
  
  /* already-selected tank keeps the grey+outline look set by .selected-tank */

/* ─────────────────────────────────────────────────────────────
   Modal overlay and button theming for non-blocking alerts
───────────────────────────────────────────────────────────── */
#modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}
#modal-overlay.modal-hidden {
  display: none;
}
#modal-box {
  background: #fff;
  padding: 20px;
  border-radius: 5px;
  max-width: 90%;
  box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}
#modal-message {
  margin-bottom: 20px;
  white-space: pre-wrap;
  font-family: inherit;
  color: #333;
}
#modal-buttons {
  display: flex;
  justify-content: center;
  gap: 1em;
  margin-top: 1em;
}
#modal-buttons button {
  padding: 0.75em 1.5em;
  border: none;
  border-radius: 4px;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  min-width: 6rem;
}
#modal-buttons button:first-child {
  background-color: var(--color-button-gray);
  color: #000;
}
@media (hover: hover) {
  #modal-buttons button:first-child:hover {
    background-color: #aaa !important;
    color: #000 !important;
  }
}
#modal-buttons button:last-child {
  background-color: var(--color-button-primary);
  color: #fff;
}

/* ─────────────  Dropdown wrapper – unify Probe Type & Probe Length  ───────────── */
.dropdown-wrapper {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
}

.dropdown-wrapper label {
  white-space: nowrap;
  font-size: 0.9rem;
  font-weight: 600;
}

.dropdown-wrapper select {
  background-color: var(--color-input-gray);
  padding: 8px 12px;
  border: none;
  border-radius: var(--card-border-radius);
}

.configuration-wrapper .dropdown-wrapper select,
.data-zone-settings .dropdown-wrapper select {
  min-width: 220px; /* keep consistent control width across locations */
  /*max-height: 220px;*/
}

/* ─────────────  Probe Info layout (stacked list)  ───────────── */
.data-zone-settings .probe-info {
  display: flex;
  flex-direction: column;   /* stack rows vertically */
  gap: 8px;                 /* space between rows */
  padding: 10px 0;
}

.data-zone-settings .probe-info > div {
  display: grid;            /* each row: label | input */
  grid-template-columns: 160px minmax(200px, 1fr);
  column-gap: 12px;
  align-items: center;
}

.data-zone-settings .probe-info label {
  font-weight: 600;
  white-space: nowrap;
}

.data-zone-settings .probe-info input[readonly] {
  width: 100%;
  max-width: 320px;
  background-color: var(--color-input-gray);
  padding: 8px 12px;
  border: none;
  border-radius: var(--card-border-radius);
}

/* ─────────────  DFU Modal Styles  ───────────── */
.dfu-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 75, 0.85);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 10000;
}

.dfu-modal-content {
  background-color: var(--color-bg-white);
  padding: 30px 40px;
  border-radius: 8px;
  text-align: center;
  min-width: 350px;
  max-width: 450px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  overflow: hidden;
}

.dfu-modal-content h3 {
  margin-bottom: 15px;
  color: var(--color-bg-primary);
  font-size: 1.4rem;
}

#dfu-status {
  margin-bottom: 20px;
  color: #333;
  font-size: 0.95rem;
  min-height: 1.5em;
}

.dfu-progress-container {
  width: 100%;
  height: 24px;
  background-color: var(--color-input-gray);
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 10px;
}

.dfu-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-button-primary), #00a86b);
  border-radius: 12px;
  transition: width 0.3s ease;
}

#dfu-progress-text {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-button-primary);
  margin-bottom: 15px;
}

.dfu-warning {
  color: #d9534f;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.dfu-button-row {
  display: flex;
  gap: 15px;
  justify-content: center;
  flex-wrap: wrap;
}

.dfu-cancel-btn {
  background-color: var(--color-button-gray);
  color: #333;
  padding: 10px 30px;
  border: none;
  border-radius: var(--card-border-radius);
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s;
}

@media (hover: hover) {
  .dfu-cancel-btn:hover {
    background-color: #d9534f !important;
    color: white !important;
  }
}

.dfu-continue-btn {
  background-color: var(--color-button-primary);
  color: white;
  padding: 10px 30px;
  border: none;
  border-radius: var(--card-border-radius);
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s, box-shadow 1s ease-out;
  animation: pulse-attention 2s infinite;
}

/* Desktop hover - stops animation while hovering */
@media (hover: hover) {
  .dfu-continue-btn:hover {
    animation: none;
  }
}

/* Touch/click active state - brief highlight that fades out */
.dfu-continue-btn:active {
  animation: none;
  box-shadow: 0 0 0 8px rgba(0, 120, 80, 0.3);
  transition: box-shadow 0s; /* Instant highlight on press */
}

/* Mobile-specific: use active-based highlight animation */
@media (hover: none) {
  .dfu-continue-btn:focus {
    animation: touch-highlight 1s ease-out forwards;
    outline: none;
  }
}

@keyframes touch-highlight {
  0% { box-shadow: 0 0 0 8px rgba(0, 120, 80, 0.4); }
  100% { box-shadow: 0 0 0 0 rgba(0, 120, 80, 0); }
}

@keyframes pulse-attention {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0, 120, 80, 0.4); }
  50% { box-shadow: 0 0 0 8px rgba(0, 120, 80, 0); }
}

.dfu-instruction {
  background-color: #f0f8ff;
  border: 1px solid var(--color-button-primary);
  border-radius: 6px;
  padding: 12px 16px;
  margin-bottom: 15px;
  color: #333;
  font-size: 0.9rem;
  line-height: 1.5;
  text-align: left;
}

/* DFU Button styling 
#dfuBtn {
  background-color: #28a745;
  color: white;
}
*/
#dfuBtn:disabled {
  background-color: var(--color-button-disabled);
  color: #999;
  cursor: not-allowed;
}

/* ─────────────  Sync Indicator Styles  ───────────── */
.sync-indicator {
    color: red;
    font-size: 1.8rem;
    font-weight: bold;
    margin-right: 10px;
    margin-left: 10px;
    animation: pulse 2s infinite;
    flex-shrink: 0;
    vertical-align: middle;
    margin-bottom: 5px;
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.5; }
    100% { opacity: 1; }
}

/* ─────────────  Responsive Mobile Styles  ───────────── */
@media screen and (max-width: 700px) {
    /* Header adjustments */
    header {
        height: auto;
        padding: 12px 15px;
    }
    
    header nav {
        flex-wrap: wrap;
        gap: 10px;
        justify-content: center;
    }
    
    header nav p {
        font-size: 1.1rem;
        text-align: center;
        width: 100%;
    }
    
    header nav object {
        width: 140px;
        order: -1;
    }
    
    header nav button {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    
    /* Main content padding */
    main .main-content {
        padding: 0 10px;
    }
    
    /* Cards stack vertically */
    main .main-content .card-wrapper .card {
        flex: 1 1 100%;
        max-width: 100%;
    }
    
    /* Data zone wrapper - stack vertically on small screens */
    .data-zone-wrapper {
        flex-direction: column;
        align-items: stretch;
    }
    
    /* Data zone settings - full width, content-based height on small screens */
    .data-zone-wrapper > .data-zone-settings {
        flex: 0 0 auto;
        max-width: 100%;
        min-width: unset;
        width: 100%;
    }
    
    .data-zone-settings {
        max-width: 100%;
        min-width: unset;
    }
    
    /* Button wrappers */
    .btn-wrapper,
    .btn-wrapper-align-start {
        flex-direction: column;
        align-items: stretch;
    }
    
    .btn-wrapper-align-start button {
        width: 100%;
        text-align: center;
    }
    
    .btn-wrapper-align-start > div {
        width: 100%;
    }
    
    /* Input fields full width on mobile */
    .btn-wrapper-align-start input:not([type="checkbox"]):not([type="radio"]) {
        width: 100%;
        max-width: 100%;
    }
    
    /* Data zone settings - keep buttons in a row */
    .data-zone-settings .btn-wrapper-align-start {
        flex-direction: row;
        flex-wrap: wrap;
    }
    
    .data-zone-settings .btn-wrapper-align-start button {
        width: auto;
        flex: 1 1 auto;
        min-width: 80px;
    }
    
    /* Calibration status grid */
    .cal-status-grid {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }
    
    /* Dropdown wrappers */
    .dropdown-wrapper {
        flex-direction: column;
        align-items: flex-start;
        width: 100%;
    }
    
    .dropdown-wrapper select {
        width: 100%;
    }
    
    .configuration-wrapper .dropdown-wrapper select,
    .data-zone-settings .dropdown-wrapper select {
        min-width: unset;
        width: 100%;
    }
    
    /* Tank info grid */
    .tank-info {
        grid-template-columns: 1fr;
    }
    
    .tank-info input[type="text"] {
        width: 100%;
        max-width: 100%;
    }
    
    /* Probe info */
    .data-zone-settings .probe-info > div {
        grid-template-columns: 1fr;
        gap: 4px;
    }
    
    /* Footer */
    footer div {
        font-size: 0.75rem;
    }
    
    footer div .current_version {
        float: none;
        display: block;
        margin-top: 5px;
    }
    
    /* Epsilon controls */
    .epsilon-controls {
        flex-direction: column;
        align-items: flex-start;
        width: 100%;
    }
    
    /* Modal adjustments */
    #modal-box {
        margin: 15px;
        max-width: calc(100% - 30px);
    }
    
    .dfu-modal-content {
        min-width: unset;
        width: calc(100% - 30px);
        max-width: 400px;
        padding: 20px;
    }
}

/* Extra small screens */
@media screen and (max-width: 480px) {
    header nav p {
        font-size: 1rem;
    }
    
    header nav button {
        padding: 8px 16px;
        font-size: 0.85rem;
    }
    
    main .main-content .card-wrapper .card {
        min-width: unset;
        padding: 12px;
    }
    
    .data-zone-settings h3 {
        font-size: 1rem;
    }
    
    /* Tighter padding on small screens */
    main .main-content .configuration-wrapper,
    .data-zone-settings {
        padding: 8px;
    }
    
    /* Data zone - ensure full width on very small screens */
    .data-zone-wrapper {
        gap: 10px;
    }
    
    .data-zone-wrapper > .data-zone-settings,
    .data-zone-settings {
        min-width: unset;
    }
    
    .btn-wrapper-align-start {
        gap: 8px;
    }
    
    /* Smaller buttons */
    button {
        padding: 8px 12px;
        font-size: 0.85rem;
    }
    
    /* Calibration status grid - single column on very small screens */
    .cal-status-grid {
        grid-template-columns: max-content 1fr;
        gap: 6px;
    }
}