.intrepid-dive-tools{
    --abyss:#081C2A;
    --abyss-deep:#050F18;
    --panel:#0E2A3D;
    --panel-2:#123449;
    --field:#0B2233;
    --teal:#2FD3B0;
    --teal-dim:#1E8C77;
    --amber:#F5A623;
    --text:#EAF4F4;
    --text-muted:#7FA4B5;
    --text-faint:#4E7688;
    --border:#1D4A63;
    --danger:#E86A5C;
    --radius:10px;
  }
  .intrepid-dive-tools, .intrepid-dive-tools *{box-sizing:border-box;}
.intrepid-dive-tools{
    background:
      radial-gradient(ellipse 900px 500px at 15% -10%, rgba(47,211,176,0.08), transparent 60%),
      radial-gradient(ellipse 800px 600px at 100% 0%, rgba(245,166,35,0.05), transparent 55%),
      var(--abyss);
    color:var(--text);
    font-family:'Inter',system-ui,sans-serif;
    -webkit-font-smoothing:antialiased;
    min-height:70vh;
  }
  .intrepid-dive-tools h1,.intrepid-dive-tools h2,.intrepid-dive-tools h3,.intrepid-dive-tools .display{font-family:'Space Grotesk',sans-serif;}
  .intrepid-dive-tools .mono{font-family:'IBM Plex Mono',monospace;}

  /* ---------- Header ---------- */
  .site-header{
    padding:28px 20px 20px;
    text-align:center;
    border-bottom:1px solid var(--border);
    background:linear-gradient(180deg, rgba(255,255,255,0.02), transparent);
  }
  .site-eyebrow{
    font-family:'IBM Plex Mono',monospace;
    font-size:11px;
    letter-spacing:0.28em;
    text-transform:uppercase;
    color:var(--teal);
    margin:0 0 10px;
  }
  .site-title{
    font-size:clamp(26px,5vw,38px);
    font-weight:700;
    margin:0 0 8px;
    letter-spacing:-0.01em;
  }
  .site-sub{
    color:var(--text-muted);
    font-size:14px;
    max-width:520px;
    margin:0 auto;
    line-height:1.5;
  }

  .disclaimer{
    background:rgba(255,59,48,0.08);
    border-top:1px solid rgba(255,59,48,0.35);
    border-bottom:1px solid rgba(255,59,48,0.35);
    padding:10px 16px;
    text-align:center;
  }
  .disclaimer p{
    margin:0;
    color:#FF3B30;
    font-weight:700;
    font-size:12.5px;
    letter-spacing:0.01em;
    line-height:1.5;
    max-width:820px;
    margin:0 auto;
  }

  /* ---------- Layout ---------- */
  .app{
    display:flex;
    max-width:1180px;
    margin:0 auto;
    min-height:70vh;
  }
  .nav-col{
    width:270px;
    flex-shrink:0;
    padding:24px 14px 40px 20px;
    position:sticky;
    top:0;
    align-self:flex-start;
    max-height:100vh;
    overflow-y:auto;
  }
  .nav-group{margin-bottom:22px;}
  .nav-group-label{
    font-family:'IBM Plex Mono',monospace;
    font-size:10.5px;
    letter-spacing:0.16em;
    text-transform:uppercase;
    color:var(--text-faint);
    padding:0 12px 8px;
  }
  .nav-btn{
    display:flex;
    align-items:center;
    gap:10px;
    width:100%;
    text-align:left;
    background:transparent;
    border:1px solid transparent;
    color:var(--text-muted);
    font-family:'Inter',sans-serif;
    font-size:13.5px;
    font-weight:500;
    padding:9px 12px;
    border-radius:8px;
    cursor:pointer;
    margin-bottom:2px;
    transition:background .15s, color .15s, border-color .15s;
  }
  .nav-btn .dot{
    width:6px;height:6px;border-radius:50%;
    background:var(--text-faint);
    flex-shrink:0;
    transition:background .15s, box-shadow .15s;
  }
  .nav-btn:hover{background:rgba(255,255,255,0.03); color:var(--text);}
  .nav-btn.active{
    background:rgba(47,211,176,0.09);
    border-color:rgba(47,211,176,0.25);
    color:var(--text);
  }
  .nav-btn.active .dot{background:var(--teal); box-shadow:0 0 8px var(--teal);}

  .stage{
    flex:1;
    padding:24px 20px 60px;
    min-width:0;
    border-left:1px solid var(--border);
  }

  .panel{display:none;}
  .panel.active{display:block; animation:fadein .25s ease;}
  @keyframes fadein{from{opacity:0; transform:translateY(4px);} to{opacity:1; transform:translateY(0);}}

  .panel-head{margin-bottom:18px;}
  .panel-title{
    font-size:22px;
    font-weight:700;
    margin:0 0 6px;
    display:flex;
    align-items:center;
    gap:10px;
  }
  .panel-title .badge{
    font-family:'IBM Plex Mono',monospace;
    font-size:10px;
    letter-spacing:0.1em;
    color:var(--abyss);
    background:var(--teal);
    padding:3px 8px;
    border-radius:20px;
    text-transform:uppercase;
    font-weight:600;
  }
  .panel-desc{color:var(--text-muted); font-size:13.5px; line-height:1.5; max-width:640px;}

  /* ---------- Card / instrument cluster ---------- */
  .cluster-row{
    display:flex;
    gap:16px;
    flex-wrap:wrap;
    margin-top:18px;
  }
  .card{
    background:var(--panel);
    border:1px solid var(--border);
    border-radius:var(--radius);
    padding:18px 18px 20px;
    flex:1 1 260px;
    min-width:240px;
  }
  .card-label{
    font-family:'IBM Plex Mono',monospace;
    font-size:11px;
    letter-spacing:0.12em;
    text-transform:uppercase;
    color:var(--amber);
    margin:0 0 14px;
  }
  .field{margin-bottom:13px;}
  .field:last-child{margin-bottom:0;}
  .field label{
    display:block;
    font-size:12.5px;
    color:var(--text-muted);
    margin-bottom:5px;
  }
  .field .unit{color:var(--text-faint); font-size:11px;}
  .field input{
    width:100%;
    background:var(--field);
    border:1px solid var(--border);
    color:var(--text);
    font-family:'IBM Plex Mono',monospace;
    font-size:15px;
    padding:9px 10px;
    border-radius:7px;
    outline:none;
    transition:border-color .15s, box-shadow .15s;
    -moz-appearance:textfield;
  }
  .field input:focus{
    border-color:var(--teal);
    box-shadow:0 0 0 3px rgba(47,211,176,0.15);
  }
  .field input::-webkit-outer-spin-button,
  .field input::-webkit-inner-spin-button{opacity:0.5;}

  /* ---------- Readout (signature element) ---------- */
  .readouts{
    margin-top:18px;
    display:flex;
    gap:14px;
    flex-wrap:wrap;
  }
  .readout{
    background:
      linear-gradient(180deg, rgba(47,211,176,0.06), transparent 40%),
      var(--abyss-deep);
    border:1px solid rgba(47,211,176,0.28);
    border-radius:var(--radius);
    padding:16px 20px;
    flex:1 1 200px;
    min-width:180px;
    position:relative;
    overflow:hidden;
  }
  .readout::before{
    content:"";
    position:absolute; inset:0;
    background:repeating-linear-gradient(180deg, rgba(255,255,255,0.015) 0px, rgba(255,255,255,0.015) 1px, transparent 1px, transparent 3px);
    pointer-events:none;
  }
  .readout .r-label{
    font-family:'IBM Plex Mono',monospace;
    font-size:10.5px;
    letter-spacing:0.12em;
    text-transform:uppercase;
    color:var(--text-faint);
    margin:0 0 6px;
  }
  .readout .r-value{
    font-family:'IBM Plex Mono',monospace;
    font-size:26px;
    font-weight:600;
    color:var(--teal);
    text-shadow:0 0 14px rgba(47,211,176,0.45);
    line-height:1.1;
  }
  .readout .r-value.secondary{color:var(--amber); text-shadow:0 0 14px rgba(245,166,35,0.4);}
  .readout .r-value.alert{color:var(--danger); text-shadow:0 0 14px rgba(232,106,92,0.45);}
  .readout .r-unit{font-family:'IBM Plex Mono',monospace; font-size:12px; color:var(--text-muted); margin-left:6px;}

  .note{
    margin-top:16px;
    font-size:12px;
    color:var(--text-faint);
    line-height:1.5;
    border-left:2px solid var(--border);
    padding-left:10px;
  }

  .col-group{
    display:grid;
    gap:16px;
    grid-template-columns:repeat(auto-fit, minmax(230px,1fr));
  }

  /* ---------- Tank preset selector ---------- */
  .tank-preset-field{
    background:rgba(47,211,176,0.05);
    border:1px dashed rgba(47,211,176,0.25);
    border-radius:8px;
    padding:10px 10px 12px;
    margin-bottom:14px !important;
  }
  .tank-select{
    width:100%;
    background:var(--field);
    border:1px solid var(--border);
    color:var(--text);
    font-family:'IBM Plex Mono',monospace;
    font-size:13px;
    padding:8px 10px;
    border-radius:7px;
    margin-bottom:9px;
    outline:none;
  }
  .tank-select:focus{border-color:var(--teal);}
  .dbl-label{
    display:flex;
    align-items:center;
    gap:7px;
    font-size:12px;
    color:var(--text-muted);
    cursor:pointer;
    user-select:none;
  }
  .dbl-label input[type=checkbox]{
    width:15px; height:15px;
    accent-color:var(--teal);
    cursor:pointer;
  }

  /* ---------- Mobile nav ---------- */
  .mobile-nav-toggle{display:none;}
  .mobile-nav-select{display:none;}

  .intrepid-dive-tools footer{
    text-align:center;
    padding:26px 20px 40px;
    color:var(--text-faint);
    font-size:12px;
    border-top:1px solid var(--border);
  }
  .intrepid-dive-tools footer a{color:var(--teal); text-decoration:none;}

  @media (max-width:860px){
    .app{flex-direction:column;}
    .nav-col{
      width:100%;
      position:sticky;
      top:0;
      background:var(--abyss);
      z-index:10;
      padding:12px 14px;
      max-height:none;
      border-bottom:1px solid var(--border);
    }
    .nav-group-label{display:none;}
    .nav-group{margin-bottom:0;}
    .nav-scroller{
      display:flex;
      gap:6px;
      overflow-x:auto;
      padding-bottom:4px;
      -webkit-overflow-scrolling:touch;
    }
    .nav-btn{white-space:nowrap; width:auto; margin-bottom:0;}
    .stage{border-left:none; padding:20px 16px 50px;}
  }

/* ---- v1.0.1 readability + select height fixes ---- */
.intrepid-dive-tools .site-title,
.intrepid-dive-tools .panel-title,
.intrepid-dive-tools .panel-title h1,
.intrepid-dive-tools .panel-title h2 {
  color: var(--text) !important;
  text-shadow: 0 2px 12px rgba(0,0,0,0.55);
}

.intrepid-dive-tools .site-title {
  font-size: clamp(32px, 5vw, 48px) !important;
  line-height: 1.05 !important;
  font-weight: 800 !important;
  letter-spacing: 0.02em !important;
}

.intrepid-dive-tools .panel-title {
  font-size: clamp(28px, 4vw, 42px) !important;
  line-height: 1.12 !important;
  font-weight: 800 !important;
  letter-spacing: 0.01em !important;
}

.intrepid-dive-tools .panel-title .badge {
  text-shadow: none !important;
  color: var(--abyss) !important;
}

.intrepid-dive-tools .tank-select,
.intrepid-dive-tools select.tank-select {
  min-height: 46px !important;
  height: 46px !important;
  line-height: 30px !important;
  padding: 10px 14px !important;
  font-size: 15px !important;
  overflow: visible !important;
}

.intrepid-dive-tools .tank-preset-field {
  padding: 14px 14px 16px !important;
}

.intrepid-dive-tools .dbl-label {
  min-height: 30px !important;
  line-height: 1.4 !important;
}


/* ---- v1.0.2 title sizing + checkbox alignment fixes ---- */
.intrepid-dive-tools .panel-title {
  font-size: clamp(24px, 3.1vw, 34px) !important;
  line-height: 1.08 !important;
  display: flex !important;
  align-items: center !important;
  gap: 12px !important;
  flex-wrap: nowrap !important;
}

.intrepid-dive-tools .panel-title .badge {
  flex: 0 0 auto !important;
  white-space: nowrap !important;
  align-self: center !important;
}

.intrepid-dive-tools .dbl-label {
  display: flex !important;
  align-items: center !important;
  gap: 12px !important;
  min-height: 34px !important;
}

.intrepid-dive-tools .dbl-label input[type="checkbox"] {
  appearance: none !important;
  -webkit-appearance: none !important;
  width: 28px !important;
  height: 28px !important;
  min-width: 28px !important;
  min-height: 28px !important;
  margin: 0 !important;
  padding: 0 !important;
  border: 1px solid var(--border) !important;
  border-radius: 8px !important;
  background: var(--field) !important;
  display: inline-grid !important;
  place-content: center !important;
  position: relative !important;
  cursor: pointer !important;
}

.intrepid-dive-tools .dbl-label input[type="checkbox"]::after {
  content: "" !important;
  width: 8px !important;
  height: 14px !important;
  border: solid #26BFFF !important;
  border-width: 0 3px 3px 0 !important;
  transform: rotate(45deg) scale(0) !important;
  transform-origin: center !important;
  margin-top: -2px !important;
}

.intrepid-dive-tools .dbl-label input[type="checkbox"]:checked::after {
  transform: rotate(45deg) scale(1) !important;
}

.intrepid-dive-tools .dbl-label input[type="checkbox"]:focus {
  outline: none !important;
  box-shadow: 0 0 0 3px rgba(47,211,176,0.15) !important;
  border-color: var(--teal) !important;
}

@media (max-width: 700px) {
  .intrepid-dive-tools .panel-title {
    font-size: clamp(24px, 7vw, 32px) !important;
    flex-wrap: wrap !important;
  }
}


/* ---- v1.0.3 checkbox rendering fix ----
   Hide the browser-native checkbox completely and render a single
   custom checkmark span so OceanWP/browser styles cannot double-render it. */
.intrepid-dive-tools .dbl-label {
  position: relative !important;
  display: inline-flex !important;
  align-items: center !important;
  gap: 12px !important;
  min-height: 34px !important;
  cursor: pointer !important;
}

.intrepid-dive-tools .dbl-label input[type="checkbox"] {
  position: absolute !important;
  opacity: 0 !important;
  width: 1px !important;
  height: 1px !important;
  min-width: 1px !important;
  min-height: 1px !important;
  margin: 0 !important;
  padding: 0 !important;
  border: 0 !important;
  appearance: none !important;
  -webkit-appearance: none !important;
  pointer-events: none !important;
}

.intrepid-dive-tools .dbl-label input[type="checkbox"]::before,
.intrepid-dive-tools .dbl-label input[type="checkbox"]::after {
  content: none !important;
  display: none !important;
}

.intrepid-dive-tools .dbl-label .checkmark {
  width: 28px !important;
  height: 28px !important;
  flex: 0 0 28px !important;
  border: 1px solid var(--border) !important;
  border-radius: 8px !important;
  background: var(--field) !important;
  position: relative !important;
  display: inline-block !important;
  box-shadow: none !important;
}

.intrepid-dive-tools .dbl-label input[type="checkbox"]:checked + .checkmark::after {
  content: "" !important;
  position: absolute !important;
  left: 8px !important;
  top: 3px !important;
  width: 8px !important;
  height: 15px !important;
  border: solid #26BFFF !important;
  border-width: 0 3px 3px 0 !important;
  transform: rotate(45deg) !important;
  transform-origin: center !important;
}

.intrepid-dive-tools .dbl-label input[type="checkbox"]:focus-visible + .checkmark {
  border-color: var(--teal) !important;
  box-shadow: 0 0 0 3px rgba(47,211,176,0.15) !important;
}

.intrepid-dive-tools .dbl-label .dbl-text {
  line-height: 1.35 !important;
}

.intrepid-dive-tools .idt-dev-badge {
  margin-top: 8px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text-faint);
  opacity: 0.85;
}

/* =====================================================
   Footer
===================================================== */

.idt-footer {
    margin-top: 48px;
    padding: 24px 0;
    border-top: 1px solid rgba(255,255,255,.08);
    text-align: center;
}

.idt-footer-disclaimer {
    color: var(--text-faint);
    font-size: 13px;
    line-height: 1.6;
    margin-bottom: 10px;
}

.idt-footer-meta {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;

    font-family: "IBM Plex Mono", monospace;
    font-size: 11px;
    letter-spacing: .08em;
    color: var(--text-faint);
    opacity: .85;
}

.idt-separator {
    opacity: .35;
}