:root{
    --bg-1:#042043;
    --bg-2:#0a3a6e;
    --paper:#ffffff;
    --paper-soft:#fafafa;
    --paper-line:#e6e6e6;
    --ink:#042043;
    --ink-soft:#6c7d8c;
    --accent:#26c3c3;
    --accent-soft:#6fd9d9;
    --teal:#1ea8a8;
    --on-dark:#ffffff;
    --on-dark-soft:#c0c0c0;
    --radius:10px;
  }
  *{box-sizing:border-box;}
  .qty-input,.item-total,.room-subtotal,.factor-value,
  .totals .row span:last-child,.container-gauge .pct,
  .item-vol,.gauge-label{font-variant-numeric:tabular-nums;}
  html,body{margin:0;padding:0;}
  body{
    font-family:'Helvetica Neue',Helvetica,Arial,sans-serif;
    background:linear-gradient(160deg,var(--bg-1),var(--bg-2) 70%);
    color:var(--on-dark);
    min-height:100vh;
    padding:28px 20px 80px;
  }
  .app{max-width:1180px;margin:0 auto;}

  /* HEADER */
  header.top{margin-bottom:22px;}
  .header-top-row{display:flex;align-items:flex-start;justify-content:space-between;gap:24px;margin-bottom:16px;}
  .header-text{flex:1;min-width:0;}
  .header-logo{height:72px;width:auto;object-fit:contain;flex:0 0 auto;margin-top:4px;filter:brightness(1);}
  @media(max-width:640px){.header-top-row{flex-direction:column;gap:12px;}.header-logo{height:48px;order:-1;margin-bottom:4px;}.eyebrow{font-size:.52rem;letter-spacing:.02em;white-space:nowrap;}}
  .eyebrow{
    font-family:'Montserrat',sans-serif;
    font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;
    color:var(--accent);margin:0 0 6px;
  }
  h1{
    font-family:'Montserrat',sans-serif;font-weight:800;
    font-size:clamp(1.4rem,2.8vw,2rem);margin:0 0 6px;letter-spacing:-0.01em;
  }
  .subtitle{color:var(--on-dark-soft);font-size:.92rem;margin:0 0 16px;max-width:680px;line-height:1.5;}

  .meta-row{
    display:flex;flex-wrap:wrap;gap:12px;
    background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);
    border-radius:var(--radius);padding:14px;
  }
  .meta-field{display:flex;flex-direction:column;gap:4px;flex:1;min-width:160px;}
  .meta-field label{font-size:.72rem;color:var(--on-dark-soft);font-family:'Montserrat',sans-serif;letter-spacing:.05em;text-transform:uppercase;}
  .meta-field input{
    background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);
    border-radius:6px;color:var(--on-dark);padding:8px 10px;font-size:.9rem;font-family:inherit;
  }
  .meta-field input::placeholder{color:var(--on-dark-soft);}
  .meta-field input:focus{outline:2px solid var(--accent);outline-offset:1px;}

  /* LAYOUT */
  .layout{display:grid;grid-template-columns:1fr 370px;gap:18px;margin-top:20px;align-items:start;}
  @media(max-width:920px){.layout{grid-template-columns:1fr;}.summary{position:static;}.subtitle{font-size:.82rem;}}

  /* ROOMS */
  .rooms{display:flex;flex-direction:column;gap:12px;}
  details.room{
    background:var(--paper);border-radius:var(--radius);color:var(--ink);
    box-shadow:0 1px 0 rgba(0,0,0,.18);overflow:hidden;
    width:100%;min-width:0;box-sizing:border-box;
  }
  details.room>summary{
    list-style:none;cursor:pointer;padding:14px 16px;
    display:flex;align-items:center;gap:12px;background:var(--paper);user-select:none;
  }
  details.room>summary::-webkit-details-marker{display:none;}
  .arrow{font-family:'Montserrat',sans-serif;font-size:.85rem;color:var(--accent);transition:transform .2s ease;flex:0 0 auto;}
  details.room[open] .arrow{transform:rotate(90deg);}
  .room-name{
    font-family:'Montserrat',sans-serif;font-weight:600;font-size:.98rem;
    color:var(--ink);flex:1;min-width:0;padding:2px 4px;
    overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
  }
  .room-subtotal{
    font-family:'Montserrat',sans-serif;font-weight:700;font-size:.92rem;
    color:var(--ink);background:var(--accent-soft);padding:4px 10px;border-radius:6px;white-space:nowrap;flex:0 0 auto;
  }
  .room-delete{flex:0 0 auto;border:none;background:transparent;color:#b0584c;font-size:1.1rem;cursor:pointer;line-height:1;padding:2px 4px;border-radius:4px;}
  .room-delete:hover{background:#f3dad6;}
  .room-body{padding:4px 16px 14px;border-top:1px solid var(--paper-line);}

  .category-header{
    font-family:'Montserrat',sans-serif;font-weight:700;font-size:.72rem;
    letter-spacing:.06em;text-transform:uppercase;color:var(--accent);
    padding:14px 0 4px;
  }
  .item-row:first-of-type,
  .category-header + .item-row{border-top:none;}
  .item-row{display:grid;grid-template-columns:1fr auto auto;align-items:center;gap:10px;padding:8px 0;border-bottom:1px solid var(--paper-line);border-radius:6px;transition:background-color .2s ease;}
  .item-row.has-qty{background:rgba(38,195,195,.12);padding-left:8px;padding-right:8px;margin-left:-8px;margin-right:-8px;}
  .item-row.has-qty .item-total{color:var(--teal);}
  .item-row:last-of-type{border-bottom:none;}
  .item-info{display:flex;flex-direction:column;gap:1px;min-width:0;}
  .item-name{font-size:.86rem;font-weight:500;line-height:1.3;}
  .item-vol{font-size:.74rem;color:var(--ink-soft);font-family:'Montserrat',sans-serif;}

  .qty-stepper{display:flex;align-items:center;gap:4px;flex:0 0 auto;}
  .step{
    width:26px;height:26px;border-radius:6px;border:1px solid var(--paper-line);
    background:var(--paper-soft);color:var(--ink);font-size:1rem;cursor:pointer;
    display:flex;align-items:center;justify-content:center;
  }
  .step:hover{background:var(--accent-soft);}
  @media(max-width:640px){
    .step{width:36px;height:36px;font-size:1.1rem;}
    .room-delete{font-size:.8rem;padding:3px 6px;min-width:0;min-height:0;}
  }
  .qty-input{width:42px;text-align:center;border:1px solid var(--paper-line);border-radius:6px;padding:4px 2px;font-family:'Montserrat',sans-serif;font-size:.88rem;color:var(--ink);background:#fff;}
  .qty-input:focus{outline:2px solid var(--accent);}
  .item-total{font-family:'Montserrat',sans-serif;font-size:.84rem;font-weight:600;color:var(--ink);min-width:62px;text-align:right;flex:0 0 auto;}

  .custom-row{display:flex;align-items:center;gap:8px;}
  .custom-delete{border:none;background:transparent;color:#b0584c;font-size:1rem;cursor:pointer;padding:2px 6px;border-radius:4px;}
  .custom-delete:hover{background:#f3dad6;}

  .add-custom{margin-top:10px;}
  .add-custom-form{display:none;gap:8px;margin-top:8px;flex-wrap:wrap;background:var(--paper-soft);padding:10px;border-radius:8px;}
  .add-custom-form.show{display:flex;}
  .add-custom-form input,.add-custom-form select{border:1px solid var(--paper-line);border-radius:6px;padding:6px 8px;font-family:inherit;font-size:.85rem;background:#fff;color:var(--ink);}
  .add-custom-form input.cf-name{flex:2;min-width:160px;}
  .add-custom-form select.cf-size{flex:2;min-width:220px;}
  .add-custom-form input.cf-qty{width:60px;}
  .cf-size-hint{
    width:100%;font-size:.74rem;color:var(--ink-soft);margin:-2px 0 2px;line-height:1.4;
  }

  .btn{font-family:'Montserrat',sans-serif;font-weight:600;font-size:.8rem;border:none;border-radius:6px;padding:7px 14px;cursor:pointer;line-height:1.3;}
  .btn-accent{background:var(--accent);color:#fff;}
  .btn-accent:hover{background:var(--teal);}
  .btn-ghost{background:transparent;border:1px solid var(--paper-line);color:var(--ink);}
  .btn-ghost:hover{background:var(--paper-soft);}
  .btn-secondary{background:#e2e8f0;border:1px solid #cbd5e1;color:var(--bg-2);}
  .btn-secondary:hover{background:#cbd5e1;border-color:#94a3b8;}
  .summary-actions .btn-ghost{color:var(--on-dark);border-color:rgba(255,255,255,.28);}
  .summary-actions .btn-ghost:hover{background:rgba(255,255,255,.08);}

  /* SUMMARY PANEL */
  .summary{
    position:sticky;top:18px;
    background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);
    border-radius:var(--radius);padding:18px;display:flex;flex-direction:column;gap:16px;
  }
  .summary h2{font-family:'Montserrat',sans-serif;margin:0;font-size:1rem;display:flex;align-items:center;gap:8px;font-weight:700;}
  .summary h2 .dot{width:8px;height:8px;border-radius:50%;background:var(--accent);display:inline-block;flex:0 0 auto;}
  .summary h3{font-family:'Montserrat',sans-serif;margin:0 0 10px;font-size:.88rem;font-weight:700;}

  /* SAVE / LOAD */
  .save-section{margin-top:16px;}
  .save-section-title{
    font-size:.74rem;color:var(--on-dark-soft);font-family:'Montserrat',sans-serif;
    letter-spacing:.05em;text-transform:uppercase;margin:0 0 6px;
  }
  .save-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px;}
  .save-row input[type=text],.save-row select{
    background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);
    border-radius:6px;color:var(--on-dark);padding:8px 10px;font-size:.85rem;font-family:inherit;flex:1;min-width:160px;
  }
  .save-row select{flex:2;}
  .save-row input::placeholder{color:var(--on-dark-soft);}
  .save-row input:focus,.save-row select:focus{outline:2px solid var(--accent);}
  .save-row .btn{flex:0 0 auto;}
  .save-status{font-size:.74rem;color:var(--on-dark-soft);margin:0 0 4px;line-height:1.5;}

  /* TOTALS */
  .totals{display:flex;flex-direction:column;gap:7px;font-size:.84rem;border-top:1px solid rgba(255,255,255,.1);border-bottom:1px solid rgba(255,255,255,.1);padding:12px 0;}
  .totals .row{display:flex;justify-content:space-between;gap:8px;color:var(--on-dark-soft);align-items:baseline;}
  .totals .row.grand{color:var(--on-dark);font-weight:700;font-size:1rem;}
  .totals .row span:last-child{font-family:'Montserrat',sans-serif;white-space:nowrap;padding-left:10px;}

  /* GAUGES */
  .gauges{display:flex;flex-direction:column;gap:12px;}
  .gauge-block{display:flex;flex-direction:column;gap:5px;}
  .gauge-label{display:flex;justify-content:space-between;font-size:.74rem;color:var(--on-dark-soft);font-family:'Montserrat',sans-serif;}
  .container-gauge{
    position:relative;height:34px;border-radius:5px;
    border:2px solid rgba(255,255,255,.25);
    background:repeating-linear-gradient(90deg,rgba(255,255,255,.03) 0 7px,rgba(255,255,255,.07) 7px 14px);
    overflow:hidden;
  }
  .container-gauge .fill{position:absolute;inset:0;width:0%;background:linear-gradient(90deg,var(--accent),var(--accent-soft));transition:width .45s ease;}
  .container-gauge .door{position:absolute;right:0;top:0;bottom:0;width:10px;background:rgba(4,32,67,.45);border-left:1px solid rgba(255,255,255,.2);}
  .container-gauge .pct{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-family:'Montserrat',sans-serif;font-weight:700;font-size:.82rem;color:#fff;text-shadow:0 1px 2px rgba(0,0,0,.5);}

  /* NOTES / ACTIONS */
  .field-label{font-size:.76rem;color:var(--on-dark-soft);display:block;margin-bottom:6px;}
  textarea#notes{width:100%;min-height:70px;resize:vertical;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:6px;color:var(--on-dark);padding:8px 10px;font-family:inherit;font-size:.85rem;}
  textarea#notes::placeholder{color:var(--on-dark-soft);}
  .summary-actions{display:flex;gap:8px;flex-wrap:wrap;}
  .summary-actions .btn{flex:1;}
  .note{font-size:.72rem;color:var(--on-dark-soft);line-height:1.55;text-align:justify;}

  /* ADD ROOM BAR */
  .add-room-bar{display:flex;gap:10px;flex-wrap:wrap;margin-top:6px;align-items:center;}
  .add-room-bar select{
    flex:1;min-width:200px;background:var(--paper);border:1px solid var(--paper-line);
    border-radius:6px;padding:8px 10px;font-family:'Montserrat',sans-serif;font-size:.85rem;color:var(--ink);cursor:pointer;
  }
  .add-room-bar select:focus{outline:2px solid var(--accent);}
  .add-room-bar .btn{flex:0 0 auto;}

  /* TOAST */
  #toast{
    position:fixed;bottom:18px;left:50%;transform:translateX(-50%) translateY(20px);
    background:var(--ink);color:#fff;padding:10px 18px;border-radius:8px;font-size:.85rem;
    opacity:0;transition:opacity .25s,transform .25s;pointer-events:none;
    font-family:'Montserrat',sans-serif;text-align:center;
  }
  #toast.show{opacity:1;transform:translateX(-50%) translateY(0);}

  /* GATE SCREEN */
  .gate-overlay{
    position:fixed;inset:0;z-index:1000;
    background:linear-gradient(160deg,var(--bg-1),var(--bg-2) 70%);
    display:flex;align-items:center;justify-content:center;
    padding:24px;
  }
  .gate-card{
    background:rgba(255,255,255,.05);
    border:1px solid rgba(255,255,255,.12);
    border-radius:14px;
    padding:32px 28px;
    max-width:420px;
    width:100%;
    text-align:center;
  }
  .gate-card img{height:56px;width:auto;object-fit:contain;margin-bottom:18px;}
  .gate-card h2{
    font-family:'Montserrat',sans-serif;font-weight:700;font-size:1.2rem;
    margin:0 0 8px;color:var(--on-dark);
  }
  .gate-card p{
    font-size:.88rem;color:var(--on-dark-soft);line-height:1.5;margin:0 0 20px;
  }
  .gate-card input{
    width:100%;text-align:center;font-size:1.1rem;letter-spacing:.04em;
    background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.18);
    border-radius:8px;color:var(--on-dark);padding:12px 14px;font-family:'Montserrat',sans-serif;
    box-sizing:border-box;
  }
  .gate-card input::placeholder{color:var(--on-dark-soft);font-size:.78rem;letter-spacing:0;}
  .gate-card input:focus{outline:2px solid var(--accent);}
  .gate-error{
    color:#ff9d8a;font-size:.78rem;margin-top:8px;min-height:1.2em;text-align:left;
  }
  .gate-btn{
    margin-top:18px;width:100%;
    font-family:'Montserrat',sans-serif;font-weight:700;font-size:.92rem;
    background:var(--accent);color:#fff;border:none;border-radius:8px;
    padding:12px 14px;cursor:pointer;
    display:flex;align-items:center;justify-content:center;gap:10px;
  }
  .gate-btn:hover{background:var(--teal);}
  .gate-btn:disabled{opacity:.5;cursor:not-allowed;}
  .gate-btn-icon{height:16px !important;width:auto;object-fit:contain;flex:0 0 auto;margin-bottom:0;position:relative;top:8px;}
  .gate-btn-divider{opacity:.6;font-weight:400;}

  .mobile-only{display:none;}
  @media(max-width:640px){
    .mobile-only{display:block;}
    .gate-card p{font-size:.8rem;}
    .gate-card input::placeholder{font-size:.7rem;}
    .subtitle{font-size:.80rem;}
    #savedList{width:100%;flex:1 1 100%;min-width:0;}
    .add-custom-form{flex-direction:column;}
    .add-custom-form input.cf-name{min-width:0;width:100%;flex:1 1 100%;}
    .add-custom-form select.cf-size{min-width:0;width:100%;flex:1 1 100%;}
    .add-custom-form input.cf-qty{width:100%;flex:1 1 auto;}
    .add-custom-form .btn[data-addcustom]{width:100%;}
    .add-room-bar{flex-direction:column;align-items:stretch;}
    .add-room-bar select{min-width:0;width:100%;}
    .add-room-bar .btn{width:100%;}
    .sp-header h1{font-size:.90rem;}
    .sp-volcalc-grand{display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px; font-size: .80rem; white-space: normal; text-align: center;}
    .sp-vol-big{font-size: 1.10rem; white-space: normal; text-align: center;}
  }
  .app.locked{filter:blur(6px);pointer-events:none;user-select:none;}

  /* THANK YOU MODAL — mirrors the gate screen look & feel */
  .thanks-overlay{
    position:fixed;inset:0;z-index:1100;
    background:linear-gradient(160deg,var(--bg-1),var(--bg-2) 70%);
    display:flex;align-items:center;justify-content:center;
    padding:24px;
    opacity:0;visibility:hidden;transition:opacity .25s ease,visibility .25s ease;
  }
  .thanks-overlay.show{opacity:1;visibility:visible;}
  .thanks-card{
    background:rgba(255,255,255,.05);
    border:1px solid rgba(255,255,255,.12);
    border-radius:14px;
    padding:32px 28px;
    max-width:440px;
    width:100%;
    text-align:center;
  }
  @keyframes thanksPop{from{opacity:0;transform:translateY(10px) scale(.97);}to{opacity:1;transform:none;}}
  .thanks-overlay.show .thanks-card{animation:thanksPop .3s ease;}
  .thanks-card img{height:56px;width:auto;object-fit:contain;margin-bottom:16px;}
  .thanks-card .check-badge{
    width:68px;height:68px;border-radius:50%;
    background:var(--accent);color:#fff;
    display:flex;align-items:center;justify-content:center;
    margin:0 auto 18px;box-shadow:0 6px 18px rgba(38,195,195,.35);
  }
  .thanks-card h2{
    font-family:'Montserrat',sans-serif;font-weight:700;font-size:1.3rem;
    margin:0 0 10px;color:var(--on-dark);
  }
  .thanks-card p{
    font-size:.92rem;color:var(--on-dark-soft);line-height:1.6;margin:0 0 22px;
  }
  .thanks-btn{
    width:100%;
    font-family:'Montserrat',sans-serif;font-weight:700;font-size:.92rem;
    background:var(--accent);color:#fff;border:none;border-radius:8px;
    padding:12px 14px;cursor:pointer;
  }
  .thanks-btn:hover{background:var(--teal);}

  /* SUMMARY OVERLAY & MODAL */
  .summary-overlay {
    position: fixed;
    inset: 0;
    z-index: 1050;
    background: rgba(4, 32, 67, 0.85);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s ease;
    padding: 20px;
  }
  .summary-overlay.show {
    opacity: 1;
    visibility: visible;
  }
  .summary-scroll {
    background: var(--paper);
    color: var(--ink);
    border-radius: var(--radius);
    max-width: 680px;
    width: 100%;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.4);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
  }
  @keyframes summaryPop {
    from { opacity: 0; transform: translateY(15px) scale(0.98); }
    to { opacity: 1; transform: none; }
  }
  .summary-overlay.show .summary-scroll {
    animation: summaryPop 0.3s ease;
  }
  .summary-actions-bar {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 16px 24px;
    border-bottom: 1px solid var(--paper-line);
    background: var(--paper-soft);
    flex-shrink: 0;
  }
  #summaryBody {
    padding: 24px;
    overflow-y: auto;
    flex-grow: 1;
  }

  /* SUMMARY SHEET CONTENT */
  .sp-sheet {
    display: flex;
    flex-direction: column;
    gap: 24px;
  }
  .sp-header {
    border-bottom: 2px solid var(--accent);
    padding-bottom: 14px;
    margin-bottom: 4px;
  }
  .sp-header h1 {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--ink);
    margin: 0 0 10px;
    line-height: 1.25;
  }
  .sp-meta {
    font-size: 0.84rem;
    color: var(--ink-soft);
    margin-top: 4px;
  }
  .sp-section {
    display: flex;
    flex-direction: column;
    gap: 10px;
  }
  .sp-section h2 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 1rem;
    color: var(--ink);
    margin: 0;
    border-bottom: 1px solid var(--paper-line);
    padding-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }
  .sp-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 6px;
  }
  .sp-list li {
    font-size: 0.88rem;
    color: var(--ink);
    padding: 4px 0;
    border-bottom: 1px dashed var(--paper-line);
  }
  .sp-list li:last-child {
    border-bottom: none;
  }

  /* VOLUME CALCULATION CARD */
  .sp-volcalc {
    background: var(--paper-soft);
    border: 1px solid var(--paper-line);
    border-radius: 8px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  .sp-volcalc-line {
    display: flex;
    justify-content: space-between;
    font-size: 0.88rem;
    color: var(--ink-soft);
  }
  .sp-volcalc-line span:last-child {
    font-weight: 600;
    color: inherit;
  }

  .sp-volcalc-sep {
    height: 1px;
    background: var(--paper-line);
    margin: 4px 0;
  }
  .sp-volcalc-grand {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--ink);
  }
  .sp-vol-big {
    font-size: 1.3rem;
    color: var(--ink);
    font-family: 'Montserrat', sans-serif;
  }
  .sp-disclaimer {
    font-size: 0.74rem;
    color: var(--ink-soft);
    line-height: 1.45;
    margin: 4px 0 0;
  }

  /* ROOM BREAKDOWNS */
  .sp-room-block {
    background: #fff;
    border: 1px solid var(--paper-line);
    border-radius: 8px;
    padding: 14px;
    margin-bottom: 12px;
  }
  .sp-room-block:last-child {
    margin-bottom: 0;
  }
  .sp-room-block h3 {
    font-family: 'Montserrat', sans-serif;
    font-size: 0.9rem;
    font-weight: 700;
    margin: 0 0 10px;
    color: var(--ink);
  }
  .sp-item-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
  }
  .sp-item-list li {
    font-size: 0.84rem;
    color: var(--ink-soft);
    padding: 2px 0;
  }

  .sp-notes {
    font-size: 0.86rem;
    color: var(--ink);
    line-height: 1.5;
    background: var(--paper-soft);
    border: 1px solid var(--paper-line);
    border-radius: 8px;
    padding: 12px;
    margin: 0;
    white-space: pre-wrap;
  }

  /* BUTTONS STYLING */
  .sp-btn {
    font-size: 0.85rem;
    padding: 9px 18px;
  }
  .sp-primary {
    background: var(--accent);
    color: #fff;
  }
  .sp-primary:hover {
    background: var(--teal);
  }
  .sp-secondary {
    background: transparent;
    border: 1px solid var(--paper-line);
    color: var(--ink);
  }
  .sp-secondary:hover {
    background: var(--paper-soft);
  }