/* ============================================================
   SINAUMESYNC — Calculator Page Styles
   Requires: main.css
   Version 2.0
   ============================================================ */

/* ——— Calculator Page ———————————————————————————————————— */
.calc-page { min-height: 100vh; }

/* ——— Header ————————————————————————————————————————————— */
.calc-header {
  padding: 32px 0 28px;
  border-bottom: 1px solid var(--border);
}

.calc-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 18px;
}

.calc-breadcrumb a { transition: color var(--t); }
.calc-breadcrumb a:hover { color: var(--text); }
.calc-breadcrumb-sep { color: var(--subtle); }

.calc-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.calc-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.7rem);
  font-weight: 900;
  line-height: .98;
  letter-spacing: -.03em;
  text-transform: uppercase;
  text-wrap: balance;
  margin-bottom: 12px;
}

.calc-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* ——— Favorite button ——————————————————————————————————————— */
.fav-btn {
  flex-shrink: 0;
  width: 42px;
  height: 42px;
  margin-top: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  color: var(--muted);
  font-size: 1.3rem;
  line-height: 1;
  cursor: pointer;
  transition: all var(--t);
}
.fav-btn:hover { border-color: var(--border-hover); background: var(--surface-hover); color: var(--text); }
.fav-btn.is-fav { color: var(--primary); border-color: rgba(233,123,44,.4); background: var(--primary-soft); }
.fav-btn:disabled { opacity: .6; cursor: default; }
.fav-btn .fav-icon { pointer-events: none; }

/* ——— Two-column layout ——————————————————————————————————— */
.calc-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 28px;
  padding: 32px 0 80px;
  align-items: start;
}

/* ——— Unit Toggle ———————————————————————————————————————— */
.unit-toggle {
  display: inline-flex;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 4px;
  margin-bottom: 20px;
  gap: 2px;
}

.unit-btn {
  height: 34px;
  padding: 0 18px;
  font-family: var(--font-mono);
  font-size: .74rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  background: transparent;
  color: var(--muted);
  border: none;
  cursor: pointer;
  transition: all var(--t);
}

.unit-btn.active {
  background: var(--primary);
  color: #0a0c0f;
}

.unit-btn:not(.active):hover {
  color: var(--text);
  background: rgba(255,255,255,.05);
}

/* ——— Input Card ————————————————————————————————————————— */
.input-card {
  background: var(--surface);
  border: 1px solid var(--border-strong);
  padding: 28px;
  position: relative;
}
.input-card::before {
  content: "INPUT PARAMETERS";
  display: block;
  font-family: var(--font-mono);
  font-size: .66rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--primary);
  padding-bottom: 14px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--border);
}

.input-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.field label {
  font-family: var(--font-mono);
  font-size: .68rem;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: .07em;
  text-transform: uppercase;
}

.field input,
.field select {
  height: 50px;
  background: var(--inset);
  border: 1px solid var(--border-strong);
  color: var(--text);
  padding: 0 14px;
  font-family: var(--font-mono);
  font-size: .92rem;
  transition: border-color var(--t), box-shadow var(--t);
  -webkit-appearance: none;
  appearance: none;
}

.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: inset 0 0 0 1px var(--primary);
}

.field input::placeholder { color: var(--subtle); }

.field-full { grid-column: 1 / -1; }

/* ——— Material Properties ———————————————————————————————— */
.material-props {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.prop-item {
  background: rgba(13,16,20,.6);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 10px 12px;
}

.prop-label {
  font-size: .68rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .4px;
  margin-bottom: 4px;
}

.prop-value {
  font-size: .88rem;
  font-weight: 700;
  color: var(--text);
}

/* ——— Calculate Button ——————————————————————————————————— */
.calc-btn {
  display: block;
  width: 100%;
  height: 54px;
  margin-top: 24px;
  background: var(--primary);
  color: #0a0c0f;
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .1em;
  border: 1px solid var(--primary);
  cursor: pointer;
  transition: background var(--t);
}

.calc-btn:hover { background: var(--primary-hover); }
.calc-btn:active { transform: translateY(1px); }

/* ——— Result Card — OUTPUT readout panel ————————————————————— */
.result-card {
  margin-top: 20px;
  background: var(--primary-dim);
  border: 1px solid var(--primary-line);
  border-left: 3px solid var(--primary);
  padding: 22px 24px;
}

/* ——— Compact Primary Result Row ————————————————————————————— */
.rc-primary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 14px 0 12px;
}

.rc-primary-item {
  background: var(--inset);
  border: 1px solid var(--border-strong);
  padding: 14px 16px;
}

.rc-primary-label {
  font-family: var(--font-mono);
  font-size: .62rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .1em;
  margin-bottom: 8px;
}

.rc-primary-value {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.result-label {
  font-size: .72rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .5px;
  margin-bottom: 6px;
}

.result-value {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 5px;
  font-variant-numeric: tabular-nums;
}

.result-mode {
  font-size: .78rem;
  color: var(--muted);
  margin-bottom: 20px;
}

/* ——— Recommendation Block ——————————————————————————————— */
.result-recommendation {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 16px 18px;
  margin-bottom: 14px;
}

.rec-label {
  font-size: .68rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .5px;
  margin-bottom: 7px;
}

.rec-value {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

.rec-sub {
  font-size: .8rem;
  color: var(--muted);
  margin-top: 3px;
}

/* ——— Warning / Notes ———————————————————————————————————— */
.calc-warning {
  display: flex;
  gap: 10px;
  padding: 12px 15px;
  background: rgba(245,158,11,.08);
  border: 1px solid rgba(245,158,11,.22);
  border-radius: var(--r-md);
  font-size: .83rem;
  color: var(--warning);
  line-height: 1.55;
  margin-top: 10px;
}

.calc-note {
  display: flex;
  gap: 10px;
  padding: 12px 15px;
  background: rgba(59,130,246,.07);
  border: 1px solid rgba(59,130,246,.18);
  border-radius: var(--r-md);
  font-size: .83rem;
  color: var(--muted);
  line-height: 1.6;
  margin-top: 10px;
}

/* ——— Share URL Row —————————————————————————————————————— */
.share-row {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  align-items: center;
}

.share-label {
  font-size: .72rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .4px;
  white-space: nowrap;
}

.share-input {
  flex: 1;
  height: 38px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  color: var(--subtle);
  padding: 0 12px;
  font-size: .78rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  cursor: pointer;
}

.copy-btn {
  height: 38px;
  padding: 0 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  color: var(--text);
  font-family: inherit;
  font-size: .8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--t);
  white-space: nowrap;
  flex-shrink: 0;
}

.copy-btn:hover  { border-color: var(--border-hover); background: var(--surface-hover); }
.copy-btn.copied { color: var(--success); border-color: rgba(34,197,94,.3); }

/* ——— Unit toggle (SI / Imperial) ————————————————————————— */
.unit-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  overflow: hidden;
}

.unit-toggle-btn {
  height: 34px;
  padding: 0 14px;
  background: var(--surface);
  border: none;
  color: var(--muted);
  font-family: inherit;
  font-size: .78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--t);
}

.unit-toggle-btn + .unit-toggle-btn { border-left: 1px solid var(--border); }
.unit-toggle-btn:hover  { background: var(--surface-hover); color: var(--text); }
.unit-toggle-btn.active { background: var(--primary-soft); color: var(--primary); }

/* ——— Formula & Accordion ———————————————————————————————— */
.formula-section {
  margin-top: 32px;
}

.formula-section-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .01em;
  margin-bottom: 14px;
  color: var(--text);
}

.accordion-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  overflow: hidden;
  margin-bottom: 8px;
}

.accordion-trigger {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 17px 20px;
  background: none;
  border: none;
  font-family: inherit;
  font-size: .92rem;
  font-weight: 700;
  color: var(--text);
  cursor: pointer;
  transition: background var(--t);
  text-align: left;
}

.accordion-trigger:hover { background: rgba(255,255,255,.025); }

.accordion-icon {
  font-size: .7rem;
  color: var(--muted);
  transition: transform var(--t-med);
  flex-shrink: 0;
}

.accordion-item.open .accordion-icon { transform: rotate(180deg); }

.accordion-body {
  display: none;
  padding: 0 20px 22px;
  color: var(--muted);
  font-size: .88rem;
  line-height: 1.75;
}

.accordion-item.open .accordion-body { display: block; }

/* Formula equation display */
.formula-eq {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary);
  font-family: var(--font-mono);
  background: rgba(13,16,20,.75);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 14px 18px;
  margin-bottom: 18px;
  overflow-x: auto;
}

/* Variable table */
.var-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .84rem;
}

.var-table th {
  text-align: left;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: .5px;
  font-weight: 700;
}

.var-table td {
  padding: 10px 12px;
  border-bottom: 1px solid rgba(38,45,56,.6);
  vertical-align: top;
  color: var(--muted);
}

.var-table tr:last-child td { border-bottom: none; }

.var-sym {
  font-weight: 800;
  color: var(--primary);
  font-family: var(--font-mono);
  font-size: .88rem;
}

.accordion-body p { margin-bottom: 10px; }
.accordion-body p:last-child { margin-bottom: 0; }

.accordion-body ul,
.accordion-body ol {
  padding-left: 20px;
  margin: 10px 0;
  list-style: disc;
}

.accordion-body li { margin-bottom: 6px; }

strong { color: var(--text); font-weight: 700; }

/* ——— Sidebar ————————————————————————————————————————————— */
.sidebar-card {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 22px;
  margin-bottom: 14px;
  transition: border-color var(--t);
}
.sidebar-card:hover { border-color: var(--border-hover); }

.sidebar-title {
  font-family: var(--font-mono);
  font-size: .68rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: .12em;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.sidebar-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.sidebar-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(38,45,56,.6);
}

.sidebar-item:last-child { border-bottom: none; }

.sidebar-label {
  font-size: .82rem;
  color: var(--muted);
  line-height: 1.5;
}

.sidebar-value {
  font-family: var(--font-mono);
  font-size: .8rem;
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  text-align: right;
  white-space: nowrap;
}

.standards-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.standards-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 10px 0;
  border-bottom: 1px solid rgba(38,45,56,.6);
  font-size: .84rem;
  color: var(--muted);
  line-height: 1.5;
}

.standards-list li:last-child { border-bottom: none; }

.std-code {
  font-weight: 700;
  color: var(--primary);
  font-family: var(--font-mono);
  font-size: .8rem;
  white-space: nowrap;
  flex-shrink: 0;
}

.related-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.related-list li a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 10px;
  border-radius: var(--r-sm);
  font-size: .86rem;
  font-weight: 500;
  color: var(--muted);
  transition: all var(--t);
}

.related-list li a:hover {
  background: var(--surface-hover);
  color: var(--text);
}

.r-badge {
  margin-left: auto;
  font-size: .62rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 5px;
  background: rgba(255,255,255,.05);
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .3px;
}

.tip-card {
  background: var(--primary-dim);
  border: 1px solid rgba(233,123,44,.18);
}

.tip-card .sidebar-title { color: var(--primary); }

.tip-card p {
  font-size: .84rem;
  color: var(--muted);
  line-height: 1.7;
}

/* ——— Field helpers (NPS label, auto tag, hint) ————————————— */
.field-optional {
  font-weight: 400;
  color: var(--subtle);
  font-size: .7rem;
  text-transform: none;
  letter-spacing: 0;
  margin-left: 4px;
}

.field-auto-tag {
  display: inline-flex;
  align-items: center;
  height: 16px;
  padding: 0 6px;
  margin-left: 6px;
  font-size: .6rem;
  font-weight: 700;
  letter-spacing: .4px;
  text-transform: uppercase;
  background: var(--primary-soft);
  color: var(--primary);
  border: 1px solid rgba(233,123,44,.25);
  border-radius: var(--r-full);
  vertical-align: middle;
}

.field-hint {
  font-size: .7rem;
  color: var(--subtle);
  margin-top: 4px;
}

/* ——— Recommendation block (rich) ——————————————————————————— */
.rec-std {
  font-size: .65rem;
  font-weight: 600;
  color: var(--subtle);
  text-transform: none;
  letter-spacing: 0;
  margin-left: 4px;
}

.rec-badge-row {
  margin: 8px 0 10px;
}

.rec-badge {
  display: inline-block;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: .5px;
}

.rec-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-top: 6px;
}

.rec-stat {
  background: rgba(13,16,20,.5);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 10px 12px;
}

.rec-stat-label {
  font-size: .65rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .4px;
  margin-bottom: 4px;
}

.rec-stat-value {
  font-size: .92rem;
  font-weight: 700;
  color: var(--text);
}

.rec-stat-good { color: var(--success); }
.rec-stat-warn { color: var(--warning); }
.rec-stat-low  { color: var(--error); }

/* ——— Reference notice ——————————————————————————————————————— */
.ref-notice {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 11px 14px;
  background: rgba(59,130,246,.06);
  border: 1px solid rgba(59,130,246,.15);
  border-radius: var(--r-md);
  font-size: .78rem;
  color: var(--muted);
  line-height: 1.6;
  margin-top: 12px;
}

.ref-icon {
  font-size: .95rem;
  color: var(--info);
  flex-shrink: 0;
  margin-top: 1px;
}

.ref-tooltip {
  margin-left: auto;
  flex-shrink: 0;
  color: var(--info);
  font-size: .72rem;
  font-weight: 700;
  cursor: help;
  white-space: nowrap;
  padding: 2px 0;
  opacity: .75;
  transition: opacity var(--t);
}
.ref-tooltip:hover { opacity: 1; }

/* ——— Engineering data panel ————————————————————————————————— */
.eng-data-panel {
  background: rgba(13,16,20,.5);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 16px 18px;
  margin-top: 14px;
}

.edp-section {
  margin-bottom: 14px;
}
.edp-section:last-child { margin-bottom: 0; }

.edp-heading {
  font-size: .65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .6px;
  color: var(--muted);
  margin-bottom: 10px;
  padding-bottom: 7px;
  border-bottom: 1px solid var(--border);
}

.edp-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.edp-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.edp-item-wide {
  grid-column: span 3;
}

.edp-label {
  font-size: .62rem;
  font-weight: 700;
  color: var(--subtle);
  text-transform: uppercase;
  letter-spacing: .3px;
}

.edp-val {
  font-size: .84rem;
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

/* ——— SEO Content section ———————————————————————————————————— */
.seo-content {
  margin-top: 48px;
  padding-top: 36px;
  border-top: 1px solid var(--border);
}

.seo-section-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 28px;
}

.seo-block {
  margin-bottom: 32px;
}

.seo-h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
}

.seo-block p {
  font-size: .88rem;
  color: var(--muted);
  line-height: 1.8;
  margin-bottom: 10px;
}

.seo-block p:last-child { margin-bottom: 0; }

.seo-formula {
  display: inline-block;
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
  font-family: var(--font-mono);
  background: rgba(13,16,20,.75);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 10px 16px;
  margin: 10px 0;
}

/* ——— FAQ list ——————————————————————————————————————————————— */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 8px;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.faq-trigger {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 18px;
  background: none;
  border: none;
  font-family: inherit;
  font-size: .88rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: background var(--t);
  text-align: left;
  gap: 12px;
}

.faq-trigger:hover { background: rgba(255,255,255,.025); }

.faq-icon {
  font-size: 1.1rem;
  color: var(--primary);
  font-weight: 400;
  flex-shrink: 0;
  line-height: 1;
  width: 16px;
  text-align: center;
  transition: transform var(--t-med);
}

.faq-item.open .faq-icon { transform: rotate(0deg); }

.faq-body {
  display: none;
  padding: 0 18px 16px;
}

.faq-item.open .faq-body { display: block; }

.faq-body p {
  font-size: .86rem;
  color: var(--muted);
  line-height: 1.8;
  margin-bottom: 8px;
}
.faq-body p:last-child { margin-bottom: 0; }

/* ——— Result Card v3.1 — header ————————————————————————————— */
.rc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.rc-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .02em;
  color: var(--text);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 9px;
}
.rc-title::before {
  content: "▸";
  color: var(--primary);
  font-size: .8rem;
}

.rc-mode-badge {
  font-family: var(--font-mono);
  font-size: .62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--primary);
  background: var(--primary-soft);
  border: 1px solid var(--primary-line);
  padding: 3px 10px;
  white-space: nowrap;
}

/* ——— Thickness Breakdown */
.tb-section {
  margin-bottom: 16px;
}

.thickness-breakdown {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 10px;
}

.tb-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 9px 12px;
  border-radius: var(--r-md);
  transition: background var(--t);
}

.tb-row:not(.tb-total):hover {
  background: rgba(255,255,255,.025);
}

.tb-label {
  font-size: .8rem;
  color: var(--muted);
  font-weight: 500;
}

.tb-rhs {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.tb-sym {
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--subtle);
  min-width: 20px;
  text-align: right;
}

.tb-value {
  font-size: .95rem;
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  min-width: 72px;
  text-align: right;
}

.tb-divider {
  height: 1px;
  background: rgba(233,123,44,.18);
  margin: 4px 12px;
}

.tb-total {
  background: var(--primary-dim);
  border: 1px solid rgba(233,123,44,.2);
}

.tb-total .tb-label {
  font-weight: 700;
  color: var(--text);
  font-size: .82rem;
}

.tb-total .tb-sym {
  color: var(--primary);
  opacity: .55;
}

.tb-total .tb-value {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--primary);
}

/* Equation box */
.eq-box {
  background: rgba(13,16,20,.65);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 11px 14px;
}

.eq-formula {
  font-family: var(--font-mono);
  font-size: .8rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 5px;
  overflow-x: auto;
  white-space: nowrap;
}

.eq-substituted {
  font-size: .7rem;
  color: var(--subtle);
  font-family: var(--font-mono);
  line-height: 1.55;
  overflow-x: auto;
  white-space: nowrap;
}

/* Data Table */
.data-table {
  display: flex;
  flex-direction: column;
}

.dt-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: 16px;
  padding: 8px 0;
  border-bottom: 1px solid rgba(38,45,56,.55);
}

.dt-row:last-child { border-bottom: none; }

.dt-label {
  font-size: .78rem;
  color: var(--muted);
  font-weight: 500;
}

.dt-value {
  font-size: .88rem;
  font-weight: 700;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  text-align: right;
  white-space: nowrap;
}

/* Disclaimer Card */
.disclaimer-card {
  padding: 18px 20px;
  border: 1px solid rgba(59,130,246,.14);
  border-radius: var(--r-lg);
  background: rgba(13,16,20,.55);
  margin-top: 14px;
}

.disclaimer-card p {
  font-size: .76rem;
  color: var(--muted);
  line-height: 1.75;
  text-align: justify;
  margin-bottom: 12px;
}

.disclaimer-card p:last-child { margin-bottom: 0; }

/* Responsive */
@media (max-width: 920px) {
  .calc-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 860px) {
  .rec-grid { grid-template-columns: repeat(2, 1fr) !important; }
  .edp-grid { grid-template-columns: repeat(2, 1fr); }
  .edp-item-wide { grid-column: span 2; }
}

@media (max-width: 580px) {
  .input-grid {
    grid-template-columns: 1fr;
  }
  .material-props {
    grid-template-columns: 1fr 1fr;
  }
  .result-value { font-size: 2rem; }
  .formula-eq { font-size: .88rem; }
  .rec-grid { grid-template-columns: 1fr 1fr; }
  .edp-grid { grid-template-columns: 1fr 1fr; }
  .edp-item-wide { grid-column: span 2; }
  .ref-notice { flex-direction: column; }
  .ref-tooltip { margin-left: 0; }
  .tb-total .tb-value { font-size: 1.2rem; }
  .eq-formula,
  .eq-substituted { font-size: .65rem; }
  .disclaimer-card p { text-align: left; }
}

/* ═══════════════════════════════════════════════════
   SEO PROGRESSIVE DISCLOSURE
   ═══════════════════════════════════════════════════ */

/* Guide header */
.seo-guide-head {
  margin-bottom: 24px;
}
.seo-guide-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 6px;
  line-height: 1.25;
}
.seo-guide-sub {
  font-size: .78rem;
  color: var(--muted);
  font-weight: 500;
  letter-spacing: .02em;
}

/* Preview block */
.seo-preview-wrap {
  position: relative;
  max-height: 310px;
  overflow: hidden;
  margin-bottom: 0;
}
.seo-preview-fade {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 110px;
  background: linear-gradient(to bottom, transparent 0%, var(--bg, #0d1014) 100%);
  pointer-events: none;
}
.seo-preview-text p {
  font-size: 1rem;
  line-height: 1.85;
  text-align: justify;
  margin-bottom: 18px;
  color: var(--text);
}

/* Read More button row */
.seo-readmore-row {
  display: flex;
  justify-content: center;
  margin-top: 20px;
  margin-bottom: 32px;
}
.seo-readmore-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 26px;
  border: 1.5px solid var(--primary);
  border-radius: var(--r-full, 9999px);
  background: transparent;
  color: var(--primary);
  font-size: .875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--t, .18s), color var(--t, .18s), transform .1s;
  letter-spacing: .01em;
}
.seo-readmore-btn:hover {
  background: var(--primary-soft);
}
.seo-readmore-btn:active {
  transform: scale(.97);
}
.seo-readmore-arrow {
  flex-shrink: 0;
  transition: transform .3s ease;
}
.seo-readmore-btn.open .seo-readmore-arrow {
  transform: rotate(180deg);
}

/* Articles container */
.seo-articles {
  display: none;
  margin-top: 8px;
}
.seo-articles.open {
  display: block;
  animation: seoFadeIn .25s ease;
}
@keyframes seoFadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Individual article */
.seo-article {
  border-bottom: 1px solid var(--border);
}
.seo-article:first-child {
  border-top: 1px solid var(--border);
}

/* Article trigger button */
.seo-art-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: transparent;
  border: none;
  padding: 18px 4px;
  cursor: pointer;
  text-align: left;
  color: var(--text);
  transition: color var(--t, .18s);
}
.seo-art-trigger:hover {
  color: var(--primary);
}
.seo-art-heading {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0;
  line-height: 1.3;
  color: inherit;
}
.seo-art-icon {
  flex-shrink: 0;
  font-size: 1.3rem;
  font-weight: 400;
  line-height: 1;
  color: var(--primary);
  width: 22px;
  text-align: center;
  transition: transform .3s ease;
  user-select: none;
}
.seo-article.open .seo-art-icon {
  transform: rotate(45deg);
}

/* Article body */
.seo-art-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height .38s ease;
}
.seo-art-body p {
  font-size: 1rem;
  line-height: 1.85;
  text-align: justify;
  margin-bottom: 18px;
  color: var(--text);
  max-width: 850px;
}
.seo-art-body strong {
  color: var(--text);
  font-weight: 600;
}
.seo-art-body .seo-formula {
  max-width: 850px;
}
/* Padding wrapper — only shows when open */
.seo-art-body > *:first-child {
  padding-top: 2px;
}
.seo-art-body > *:last-child {
  padding-bottom: 20px;
}
/* FAQ nested inside article body */
.seo-art-body--faq {
  padding-bottom: 4px;
}
.seo-art-body--faq .faq-list {
  max-width: 850px;
  padding-bottom: 8px;
}

/* Mobile */
@media (max-width: 768px) {
  .seo-guide-title {
    font-size: 1.4rem;
  }
  .seo-preview-wrap {
    max-height: 260px;
  }
  .seo-art-body p,
  .seo-preview-text p {
    font-size: .94rem;
    text-align: left;
  }
  .seo-art-heading {
    font-size: .96rem;
  }
  .seo-readmore-btn {
    font-size: .82rem;
    padding: 9px 20px;
  }
}

/* ═══════════════════════════════════════════════════
   PIPE MATERIAL DATABASE
   ═══════════════════════════════════════════════════ */

/* Search bar */
.mat-db-search {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
  align-items: flex-end;
}

.mat-db-search .field { flex: 1; min-width: 180px; }
.mat-db-search .field-grow-2 { flex: 2; }
.mat-db-search .field-narrow { flex: 0 0 150px; }

/* Count + hint row */
.mat-count-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.mat-count {
  font-size: .78rem;
  color: var(--muted);
  font-weight: 600;
}

.mat-compare-hint {
  font-size: .72rem;
  color: var(--subtle);
}

/* Table wrapper */
.mat-table-wrap {
  overflow-x: auto;
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
}

.mat-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .84rem;
  min-width: 600px;
}

.mat-table thead th {
  background: var(--surface);
  padding: 0 12px 0 0;
  height: 42px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  text-align: left;
  vertical-align: middle;
}

.mat-table thead th:first-child { padding-left: 14px; }
.mat-table thead th.th-num { text-align: right; padding-right: 14px; }

.mat-table tbody td {
  padding: 10px 12px 10px 0;
  border-bottom: 1px solid rgba(38,45,56,.5);
  vertical-align: middle;
  color: var(--muted);
}

.mat-table tbody td:first-child { padding-left: 14px; }

.mat-table tbody tr:last-child td { border-bottom: none; }

.mat-table tbody tr.mat-row:hover { background: rgba(255,255,255,.018); }

/* Sort buttons */
.sort-btn {
  background: none;
  border: none;
  color: var(--muted);
  font-family: inherit;
  font-size: .68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .4px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 0;
  transition: color var(--t);
  white-space: nowrap;
}

.sort-btn:hover { color: var(--text); }
.sort-btn.sort-active { color: var(--primary); }

.sort-btn::after {
  content: '↕';
  font-size: .65rem;
  opacity: .35;
  line-height: 1;
}

.sort-btn.sort-active::after { content: '↑'; opacity: 1; }
.sort-btn.sort-active.sort-desc::after { content: '↓'; }

/* Cell content */
.mat-name {
  font-weight: 700;
  color: var(--text);
  font-size: .86rem;
  display: block;
}

.mat-spec {
  font-size: .7rem;
  color: var(--subtle);
  font-family: var(--font-mono);
  display: block;
  margin-top: 1px;
}

.num {
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--text);
  font-size: .84rem;
  padding-right: 14px;
}

/* Type badges */
.type-badge {
  display: inline-block;
  font-size: .6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .4px;
  padding: 2px 8px;
  border-radius: var(--r-full);
  white-space: nowrap;
}

.type-carbon-steel     { background: rgba(234,179,8,.1);   color: #ca8a04; border: 1px solid rgba(234,179,8,.22); }
.type-stainless-steel  { background: rgba(59,130,246,.1);  color: #60a5fa; border: 1px solid rgba(59,130,246,.22); }
.type-alloy-steel      { background: rgba(168,85,247,.1);  color: #c084fc; border: 1px solid rgba(168,85,247,.2); }
.type-duplex-stainless { background: rgba(20,184,166,.1);  color: #2dd4bf; border: 1px solid rgba(20,184,166,.2); }
.type-nickel-alloy     { background: rgba(233,123,44,.1);  color: var(--primary); border: 1px solid rgba(233,123,44,.22); }

/* Compare panel */
.compare-panel {
  margin-top: 20px;
  background: var(--surface);
  border: 1px solid rgba(233,123,44,.25);
  border-radius: var(--r-xl);
  padding: 22px 24px;
}

.cmp-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.cmp-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.cmp-clear-btn {
  height: 32px;
  padding: 0 14px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  color: var(--muted);
  font-family: inherit;
  font-size: .78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--t);
}

.cmp-clear-btn:hover { border-color: rgba(233,123,44,.4); color: var(--text); }

.cmp-table-wrap { overflow-x: auto; }

.cmp-row {
  display: flex;
  border-bottom: 1px solid rgba(38,45,56,.5);
  min-width: 400px;
}

.cmp-row:last-child { border-bottom: none; }

.cmp-head { background: rgba(13,16,20,.45); }

.cmp-label {
  flex: 0 0 170px;
  padding: 10px 12px;
  font-size: .68rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .4px;
  border-right: 1px solid rgba(38,45,56,.5);
  background: rgba(13,16,20,.25);
  align-self: stretch;
  display: flex;
  align-items: center;
}

.cmp-col {
  flex: 1;
  padding: 10px 12px;
  font-size: .85rem;
  font-weight: 600;
  color: var(--text);
  font-variant-numeric: tabular-nums;
  border-right: 1px solid rgba(38,45,56,.3);
  word-break: break-word;
}

.cmp-col:last-child { border-right: none; }

.cmp-head .cmp-col { font-weight: 700; font-size: .86rem; }

.cmp-best {
  color: var(--success) !important;
  background: rgba(34,197,94,.05);
}

.cmp-desc {
  font-size: .76rem;
  font-weight: 400;
  color: var(--muted);
  line-height: 1.65;
  font-variant-numeric: normal;
}

/* Type legend in sidebar */
.type-legend {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.type-legend-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .82rem;
  color: var(--muted);
}

/* Responsive */
@media (max-width: 580px) {
  .mat-db-search { flex-direction: column; }
  .cmp-label { flex: 0 0 110px; font-size: .62rem; }
  .cmp-col { font-size: .78rem; }
}