:root {
  --calc-navy: #06295d;
  --calc-blue: #1684cf;
  --calc-green: #76d62c;
  --calc-ink: #10233f;
  --calc-muted: #607089;
  --calc-border: #dbe4ef;
  --calc-bg: #f4f8fc;
}

.calculator-page { background: var(--calc-bg); color: var(--calc-ink); }
.calculator-auth-gate { min-height: 100vh; display: grid; place-items: center; padding: 28px; background: radial-gradient(circle at 15% 15%, rgba(118,214,44,.18), transparent 26%), linear-gradient(145deg, #031b40, #07518e); }
.calculator-auth-gate[hidden], #calculator-private-app[hidden] { display: none !important; }
.calculator-auth-card { width: min(100%, 460px); padding: clamp(28px, 5vw, 44px); color: var(--calc-ink); background: white; border-radius: 24px; box-shadow: 0 24px 70px rgba(0,0,0,.24); }
.calculator-auth-card > img { display: block; width: 150px; height: 68px; margin: 0 auto 20px; object-fit: contain; }
.calculator-auth-card > span { color: var(--calc-blue); font-size: .75rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.calculator-auth-card h1 { margin: 8px 0; color: var(--calc-navy); font-size: 1.85rem; }
.calculator-auth-card > p { margin: 0 0 22px; color: var(--calc-muted); line-height: 1.55; }
.calculator-auth-card form { display: grid; gap: 14px; }
.calculator-auth-card label { display: grid; gap: 7px; color: var(--calc-navy); font-size: .8rem; font-weight: 750; }
.calculator-auth-card input { min-height: 47px; padding: 10px 12px; border: 1px solid #bdcadd; border-radius: 10px; font: inherit; }
.calculator-auth-card > a { display: inline-block; margin-top: 20px; color: var(--calc-blue); font-size: .8rem; font-weight: 700; text-decoration: none; }
.calculator-header { background: #fff; border-bottom: 1px solid var(--calc-border); position: sticky; top: 0; z-index: 20; }
.calculator-nav { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.calculator-nav img { display: block; width: 138px; height: 56px; object-fit: contain; }
.calculator-back { color: var(--calc-navy); font-weight: 700; text-decoration: none; }
.calculator-back:hover { color: var(--calc-blue); }
.calculator-nav-actions { display: flex; align-items: center; gap: 14px; }
.calculator-nav-actions button { padding: 8px 12px; color: #8b2431; background: #fff0f2; border: 1px solid #f3c9d0; border-radius: 9px; font: inherit; font-size: .74rem; font-weight: 800; cursor: pointer; }

.calculator-hero { color: #fff; padding: 68px 0 116px; background: radial-gradient(circle at 85% 25%, rgba(118,214,44,.25), transparent 30%), linear-gradient(135deg, #031d45, #075494); }
.calculator-hero span { color: var(--calc-green); font-size: .82rem; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; }
.calculator-hero h1 { max-width: 850px; margin: 12px 0; font-size: clamp(2rem, 5vw, 3.6rem); line-height: 1.04; }
.calculator-hero p { max-width: 720px; margin: 0; color: #dcecff; font-size: 1.05rem; }

.calculator-shell { display: grid; grid-template-columns: minmax(0, 1fr); gap: 28px; margin-top: -72px; padding-bottom: 70px; position: relative; z-index: 2; }
.calculator-controls, .calculator-results { background: #fff; border: 1px solid rgba(8,55,108,.1); border-radius: 24px; box-shadow: 0 18px 50px rgba(3,35,72,.1); }
.calculator-controls { padding: clamp(18px, 3vw, 34px); }
.discipline-selector { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-bottom: 26px; }
.discipline-card { appearance: none; min-height: 150px; padding: 18px; border: 2px solid var(--calc-border); border-radius: 18px; background: #fff; color: var(--calc-ink); text-align: left; cursor: pointer; transition: .2s ease; }
.discipline-card:hover { transform: translateY(-2px); border-color: #9bc8e9; }
.discipline-card.active { border-color: var(--calc-blue); background: linear-gradient(145deg, #eef8ff, #f8fff2); box-shadow: 0 8px 24px rgba(22,132,207,.12); }
.discipline-card strong, .discipline-card small { display: block; }
.discipline-card strong { margin: 8px 0 5px; font-size: 1rem; }
.discipline-card small { color: var(--calc-muted); line-height: 1.45; }
.discipline-icon { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 13px; color: #fff; background: linear-gradient(135deg, var(--calc-blue), var(--calc-navy)); font-size: 1.25rem; }
.discipline-card.active .discipline-icon { background: linear-gradient(135deg, var(--calc-green), #2d9e4b); }

.calculator-form { display: grid; gap: 22px; }
.form-section { border: 1px solid var(--calc-border); border-radius: 18px; padding: clamp(18px, 3vw, 28px); }
.form-section[hidden] { display: none; }
.form-section-heading { display: flex; gap: 13px; align-items: flex-start; margin-bottom: 22px; }
.form-section-heading > span { flex: 0 0 auto; display: grid; place-items: center; width: 36px; height: 36px; border-radius: 50%; color: #fff; background: var(--calc-navy); font-weight: 800; }
.form-section-heading h2 { margin: 0 0 4px; color: var(--calc-navy); font-size: 1.3rem; }
.form-section-heading p { margin: 0; color: var(--calc-muted); font-size: .92rem; }
.calculator-fields { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.calculator-fields label { display: grid; align-content: start; gap: 7px; color: #29415f; font-size: .82rem; font-weight: 700; }
.calculator-fields input, .calculator-fields select { width: 100%; min-height: 46px; border: 1px solid #bdcadd; border-radius: 10px; background: #fff; color: var(--calc-ink); padding: 10px 12px; font: inherit; font-weight: 500; }
.calculator-fields input:focus, .calculator-fields select:focus, .materials-table input:focus { outline: 3px solid rgba(22,132,207,.18); border-color: var(--calc-blue); }
.calculator-form-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.calculator-primary, .calculator-secondary, .add-material, .export-actions button { border: 0; border-radius: 11px; min-height: 46px; padding: 11px 18px; font: inherit; font-weight: 800; cursor: pointer; }
.calculator-primary { background: linear-gradient(135deg, var(--calc-blue), var(--calc-navy)); color: #fff; }
.calculator-secondary { background: #eaf0f7; color: var(--calc-navy); }
.calculator-primary:hover, .calculator-secondary:hover, .add-material:hover, .export-actions button:hover { transform: translateY(-1px); }

.calculator-results { padding: clamp(18px, 3vw, 34px); scroll-margin-top: 92px; }
.quote-letterhead { display: grid; grid-template-columns: 180px 1fr auto; align-items: center; gap: 22px; margin: -4px -4px 28px; padding: 14px 4px 18px; border-bottom: 5px solid var(--calc-green); }
.quote-letterhead img { width: 165px; height: 72px; object-fit: contain; }
.quote-letterhead div { display: grid; gap: 3px; }
.quote-letterhead strong { color: var(--calc-navy); font-size: 1.1rem; letter-spacing: .05em; }
.quote-letterhead span { color: var(--calc-blue); font-size: .8rem; font-weight: 750; }
.quote-letterhead small { color: var(--calc-muted); font-size: .68rem; }
.quote-letterhead p { margin: 0; color: var(--calc-muted); text-align: right; font-size: .7rem; line-height: 1.55; }
.result-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; margin-bottom: 24px; }
.result-heading span { color: var(--calc-blue); font-size: .76rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.result-heading h2 { margin: 5px 0; color: var(--calc-navy); }
.result-heading p { margin: 0; color: var(--calc-muted); }
.export-actions { display: flex; gap: 8px; flex: 0 0 auto; }
.export-actions button { min-height: 42px; padding: 9px 13px; background: #eaf3fb; color: var(--calc-navy); }
.export-actions button:disabled, .add-material:disabled { opacity: .45; cursor: not-allowed; transform: none; }
.export-actions button span { display: inline-grid; place-items: center; min-width: 20px; color: inherit; font-size: 1rem; letter-spacing: normal; }

.materials-table-wrap { overflow-x: auto; border: 1px solid var(--calc-border); border-radius: 14px; }
.materials-table { width: 100%; min-width: 830px; border-collapse: collapse; }
.materials-table th { padding: 13px 11px; background: var(--calc-navy); color: #fff; text-align: left; font-size: .78rem; }
.materials-table td { padding: 9px; border-bottom: 1px solid var(--calc-border); vertical-align: top; }
.materials-table tbody tr:last-child td { border-bottom: 0; }
.materials-table input { width: 100%; min-height: 38px; border: 1px solid #cbd6e3; border-radius: 8px; padding: 7px 8px; color: var(--calc-ink); font: inherit; }
.materials-table .material-name { min-width: 250px; font-weight: 650; }
.materials-table td small { display: block; max-width: 300px; margin: 5px 4px 0; color: var(--calc-muted); font-size: .7rem; line-height: 1.35; }
.materials-table .row-subtotal { min-width: 125px; padding-top: 19px; font-weight: 800; color: var(--calc-navy); }
.empty-result td { padding: 42px; text-align: center; color: var(--calc-muted); }
.remove-material { width: 34px; height: 34px; border: 0; border-radius: 50%; background: #ffe8e8; color: #a51919; font-size: 1.25rem; cursor: pointer; }
.add-material { margin-top: 14px; background: #eaf7df; color: #28720d; }
.commercial-section { margin-top: 24px; padding: 22px; background: #f6f9fc; border: 1px solid var(--calc-border); border-radius: 16px; }
.commercial-section .form-section-heading { margin-bottom: 16px; }
.commercial-fields { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.calculation-totals { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin-top: 24px; }
.calculation-totals article { border-radius: 16px; padding: 21px; background: linear-gradient(145deg, #f1f7fc, #f7fff2); border: 1px solid var(--calc-border); }
.calculation-totals span, .calculation-totals small { display: block; color: var(--calc-muted); }
.calculation-totals strong { display: block; margin: 6px 0; color: var(--calc-navy); font-size: clamp(1.2rem, 3vw, 1.65rem); }
.calculation-totals .grand-total { grid-column: 1 / -1; color: white; background: linear-gradient(135deg, var(--calc-navy), #0a5a99); border: 0; }
.calculation-totals .grand-total span, .calculation-totals .grand-total strong { color: white; }
.calculation-totals .grand-total strong { font-size: clamp(1.55rem, 4vw, 2.15rem); }
.proposal-observations { display: grid; gap: 8px; margin-top: 22px; }
.proposal-observations label { color: var(--calc-navy); font-weight: 800; }
.proposal-observations textarea { width: 100%; padding: 13px; color: var(--calc-ink); background: white; border: 1px solid #bdcadd; border-radius: 11px; font: inherit; line-height: 1.5; resize: vertical; }
.technical-notes { margin-top: 22px; padding: 18px 20px; border-left: 4px solid var(--calc-green); border-radius: 0 12px 12px 0; background: #f5faef; }
.technical-notes h3 { margin: 0 0 8px; color: var(--calc-navy); font-size: 1rem; }
.technical-notes ul { margin: 0; padding-left: 20px; color: #53647a; font-size: .85rem; line-height: 1.55; }

.calculator-footer { padding: 28px 0; background: #041e46; color: #cfdef1; }
.calculator-footer .container { display: flex; align-items: center; justify-content: center; gap: 18px; text-align: center; }
.calculator-footer img { width: 90px; height: 44px; object-fit: contain; filter: brightness(0) invert(1); }
.calculator-footer p { margin: 0; font-size: .84rem; }

@media (max-width: 900px) {
  .calculator-fields { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .discipline-selector { grid-template-columns: 1fr; }
  .discipline-card { min-height: auto; }
}

@media (max-width: 620px) {
  .calculator-nav { min-height: 66px; }
  .calculator-nav img { width: 105px; height: 44px; }
  .calculator-back { font-size: .78rem; }
  .calculator-hero { padding: 48px 0 100px; }
  .calculator-fields, .calculation-totals { grid-template-columns: 1fr; }
  .commercial-fields { grid-template-columns: 1fr; }
  .calculation-totals .grand-total { grid-column: auto; }
  .quote-letterhead { grid-template-columns: 1fr; text-align: center; }
  .quote-letterhead img { margin: auto; }
  .quote-letterhead p { text-align: center; }
  .calculator-nav-actions { gap: 7px; }
  .calculator-back { max-width: 130px; }
  .result-heading { display: block; }
  .export-actions { margin-top: 16px; }
  .calculator-footer .container { flex-direction: column; gap: 7px; }
}

@media print {
  @page { margin: 15mm; }
  body.calculator-page { background: #fff; }
  .calculator-header, .calculator-hero, .calculator-controls, .calculator-footer, .export-actions, .screen-only, .add-material, .calculator-auth-gate { display: none !important; }
  .calculator-shell { display: block; margin: 0; padding: 0; }
  .calculator-results { border: 0; box-shadow: none; padding: 0; }
  .materials-table-wrap { overflow: visible; }
  .materials-table { min-width: 0; font-size: 9pt; }
  .materials-table input { border: 0; padding: 0; min-height: 0; }
  .materials-table th { background: #e7eef7 !important; color: #10233f !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  .materials-table td small { font-size: 7pt; }
  .calculation-totals, .technical-notes { break-inside: avoid; }
  .quote-letterhead { grid-template-columns: 135px 1fr auto; margin-bottom: 16px; }
  .quote-letterhead img { width: 125px; height: 55px; }
  .commercial-section { padding: 12px; }
  .commercial-fields { grid-template-columns: repeat(4, 1fr); }
  .proposal-observations textarea { border: 0; padding: 0; min-height: 70px; }
}