/* ============================================
   TEMPERATURE CONVERTER — page styles
   Accent: teal (#10b981 dark / #059669 light) — Converters category
   ============================================ */

/* ---- Page wrapper ---- */
.calc-page {
  position: relative; z-index: 1;
  max-width: 1380px; margin: 0 auto;
  padding: 48px 24px 80px;
  display: grid;
  grid-template-columns: 1fr 480px;
  grid-template-rows: auto auto;
  gap: 48px; align-items: start;
}
.calc-page-info {
  position: static;
}

/* ---- Breadcrumb ---- */
.calc-breadcrumb {
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--text-dim); margin-bottom: 20px; flex-wrap: wrap;
}
.calc-breadcrumb a { color: var(--text-dim); transition: color var(--transition); }
.calc-breadcrumb a:hover { color: #10b981; }
body.light-theme .calc-breadcrumb a:hover { color: #059669; }
.calc-breadcrumb i { font-size: 10px; }

/* ---- Category tag ---- */
.calc-page-tag {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 4px 12px 4px 8px;
  background: rgba(16,185,129,0.10); border: 1px solid rgba(16,185,129,0.28);
  border-radius: 100px; font-size: 12px; font-weight: 600; color: #10b981;
  text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 18px;
}
body.light-theme .calc-page-tag {
  background: rgba(5,150,105,0.07); border-color: rgba(5,150,105,0.20); color: #059669;
}

/* ---- Title ---- */
.calc-page-title {
  font-family: 'Bricolage Grotesque', sans-serif;
  font-size: clamp(28px, 3.2vw, 44px); font-weight: 800;
  line-height: 1.1; letter-spacing: -1.5px; color: var(--text); margin-bottom: 16px;
}
.calc-page-title span { color: #10b981; }
body.light-theme .calc-page-title span { color: #059669; }
.calc-page-desc { font-size: 16px; line-height: 1.75; color: var(--text-muted); margin-bottom: 32px; }

/* ---- Feature pills ---- */
.calc-features { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 40px; }
.calc-feature-pill {
  display: inline-flex; align-items: center; gap: 6px; padding: 6px 12px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 100px; font-size: 13px; font-weight: 500; color: var(--text-muted);
}
.calc-feature-pill i { color: #10b981; font-size: 12px; }
body.light-theme .calc-feature-pill i { color: #059669; }

/* ---- Content blocks ---- */
.calc-page-content {
  margin-top: 0;
  min-width: 0;
}

.calc-page-content.fade-up {
  opacity: 1;
  transform: none;
  animation: none;
  transition: none;
  visibility: visible;
}
.content-block { margin-bottom: 44px; }
.content-block h2 {
  font-family: 'Bricolage Grotesque', sans-serif; font-size: 22px; font-weight: 700;
  letter-spacing: -0.5px; color: var(--text); margin-bottom: 14px;
}
.content-block p { font-size: 15px; line-height: 1.8; color: var(--text-muted); margin-bottom: 10px; }
.content-block strong { color: var(--text); font-weight: 600; }

/* Formula cards grid */
.temp-formula-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 16px; }
.temp-formula-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 16px 14px;
  display: flex; flex-direction: column; gap: 6px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.temp-formula-card:hover { border-color: #10b981; box-shadow: var(--shadow); }
body.light-theme .temp-formula-card:hover { border-color: #059669; }
.tfc-from, .tfc-to {
  font-family: 'Bricolage Grotesque', sans-serif; font-size: 18px; font-weight: 800;
  color: #10b981; line-height: 1;
}
body.light-theme .tfc-from, body.light-theme .tfc-to { color: #059669; }
.tfc-arrow { font-size: 13px; color: var(--text-dim); }
.temp-formula-card > * { display: block; }
.temp-formula-card { flex-direction: row; align-items: center; gap: 8px; flex-wrap: wrap; }
.tfc-formula {
  flex: 1; min-width: 100%; font-family: 'DM Mono', monospace;
  font-size: 13px; font-weight: 500; color: var(--text);
  background: var(--bg-3); padding: 6px 10px; border-radius: 6px;
  border: 1px solid var(--border);
}
.tfc-example { font-size: 11px; color: var(--text-dim); font-style: italic; }

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 8px; }
.faq-item {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm); overflow: hidden;
}
.faq-item:hover { border-color: var(--border-hover); }
.faq-question {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 14px 18px; background: transparent; border: none; cursor: pointer;
  font-family: 'DM Sans', sans-serif; font-size: 15px; font-weight: 600;
  color: var(--text); text-align: left; transition: color var(--transition);
}
.faq-question:hover { color: #10b981; }
body.light-theme .faq-question:hover { color: #059669; }
.faq-question i { font-size: 12px; color: var(--text-dim); flex-shrink: 0; transition: transform var(--transition), color var(--transition); }
.faq-item.open .faq-question i { transform: rotate(180deg); color: #10b981; }
body.light-theme .faq-item.open .faq-question i { color: #059669; }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.35s ease, padding 0.35s ease;
  font-size: 14px; line-height: 1.75; color: var(--text-muted); padding: 0 18px;
}
.faq-answer code {
  font-family: 'DM Mono', monospace; font-size: 13px; padding: 1px 5px;
  background: var(--bg-3); border: 1px solid var(--border); border-radius: 4px; color: #10b981;
}
body.light-theme .faq-answer code { color: #059669; }
.faq-item.open .faq-answer { max-height: 300px; padding: 0 18px 16px; }

/* Also search */
.also-search-grid { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.also-search-chip {
  display: inline-flex; align-items: center; gap: 8px; padding: 8px 14px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 100px;
  font-size: 13px; font-weight: 500; color: var(--text-muted); white-space: nowrap;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.also-search-chip:hover { background: rgba(16,185,129,0.08); border-color: #10b981; color: #10b981; }
body.light-theme .also-search-chip:hover { background: rgba(5,150,105,0.06); border-color: #059669; color: #059669; }
.also-search-chip i { color: #10b981; font-size: 12px; }
body.light-theme .also-search-chip i { color: #059669; }

/* ============================================
   CALC CARD
   ============================================ */
.calc-panel { position: sticky; top: calc(var(--header-h, 68px) + 24px); }
.calc-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: var(--shadow-lg), 0 0 60px rgba(16,185,129,0.05);
}
.calc-card-header {
  padding: 20px 24px 18px; background: var(--bg-2); border-bottom: 1px solid var(--border);
  display: none; align-items: center; gap: 12px;
}
@media (max-width: 1024px) { .calc-card-header { display: flex; } }
.calc-card-icon {
  width: 40px; height: 40px; border-radius: 10px;
  background: rgba(16,185,129,0.10); border: 1px solid rgba(16,185,129,0.26);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; color: #10b981; flex-shrink: 0;
}
body.light-theme .calc-card-icon { background: rgba(5,150,105,0.07); border-color: rgba(5,150,105,0.22); color: #059669; }
.calc-card-header-text h3 { font-family: 'Bricolage Grotesque', sans-serif; font-size: 16px; font-weight: 700; color: var(--text); margin-bottom: 2px; }
.calc-card-header-text p  { font-size: 12px; color: var(--text-dim); }
.calc-card-body { padding: 20px 22px 22px; }

/* ============================================
   CONVERTER INPUT SECTION
   ============================================ */
.tc-input-section { margin-bottom: 0; }

.tc-unit-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 4px; }
.tc-value-group {}

.form-group { display: flex; flex-direction: column; gap: 7px; }
.form-label {
  display: flex; align-items: center; gap: 7px;
  font-size: 12px; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.05em; color: var(--text-muted);
}
.form-label i { color: #10b981; font-size: 11px; }
body.light-theme .form-label i { color: #059669; }

.form-input {
  width: 100%; padding: 10px 12px; background: var(--bg-2);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  color: var(--text); font-family: 'DM Sans', sans-serif; font-size: 14px;
  outline: none; transition: border-color var(--transition), box-shadow var(--transition);
  -moz-appearance: textfield; appearance: none;
}
.form-input::-webkit-outer-spin-button, .form-input::-webkit-inner-spin-button { -webkit-appearance: none; }
.form-input:hover { border-color: var(--border-hover); }
.form-input:focus { border-color: #10b981; box-shadow: 0 0 0 3px rgba(16,185,129,0.15); }
body.light-theme .form-input:focus { border-color: #059669; box-shadow: 0 0 0 3px rgba(5,150,105,0.10); }
.form-select { appearance: auto; cursor: pointer; }

/* Big input */
.tc-big-input {
  font-family: 'Bricolage Grotesque', sans-serif;
  font-size: 20px; font-weight: 700; padding: 11px 14px;
}

/* Result display (mirrors input height) */
.tc-result-display {
  width: 100%; padding: 11px 14px; background: var(--bg-3);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  font-family: 'Bricolage Grotesque', sans-serif; font-size: 20px;
  font-weight: 700; color: #10b981; line-height: 1.3; min-height: 46px;
  transition: color var(--transition);
}
body.light-theme .tc-result-display { color: #059669; }
.tc-result-display.empty { color: var(--text-dim); font-weight: 400; font-size: 14px; font-family: 'DM Sans', sans-serif; }

/* ---- Swap row ---- */
.tc-swap-row {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 6px 0; margin: 2px 0;
}
.tc-swap-label {
  font-size: 12px; font-weight: 600; color: var(--text-dim);
  text-transform: uppercase; letter-spacing: 0.06em;
}
.tc-swap-btn {
  flex-shrink: 0; width: 36px; height: 36px; border-radius: 50%;
  background: rgba(16,185,129,0.10); border: 1px solid rgba(16,185,129,0.30);
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; color: #10b981; cursor: pointer; outline: none;
  transition: background var(--transition), border-color var(--transition),
              box-shadow var(--transition);
}
body.light-theme .tc-swap-btn { background: rgba(5,150,105,0.07); border-color: rgba(5,150,105,0.26); color: #059669; }
.tc-swap-btn:hover { background: #10b981; color: #0c0f1a; box-shadow: 0 2px 12px rgba(16,185,129,0.35); }
body.light-theme .tc-swap-btn:hover { background: #059669; color: #fff; }
.tc-swap-btn:active { transform: scale(0.92); }
.tc-swap-btn i { transition: transform 0.45s cubic-bezier(0.34,1.56,0.64,1); }
.tc-swap-btn.spinning i { transform: rotate(180deg); }

/* Formula display row */
.tc-formula-row {
  margin: 4px 0 10px;
}
.tc-formula-label {
  font-size: 11px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.07em; color: #10b981; margin-bottom: 6px;
  display: flex; align-items: center; gap: 6px;
}
body.light-theme .tc-formula-label { color: #059669; }
.tc-formula-label i { font-size: 11px; }

.tc-formula-display {
  display: flex; align-items: center;
  padding: 8px 12px; background: var(--bg-3); border: 1px solid var(--border);
  border-radius: 8px; font-family: 'DM Mono', monospace;
  font-size: 12px; color: var(--text-dim); min-height: 36px;
  transition: border-color var(--transition), color var(--transition);
}
.tc-formula-display.has-value { border-color: rgba(16,185,129,0.30); color: var(--text); }
body.light-theme .tc-formula-display.has-value { border-color: rgba(5,150,105,0.26); }

/* ============================================
   OUTPUT ROW: thermometer + all-units panel
   ============================================ */
.tc-output-row {
  display: grid; grid-template-columns: 56px 1fr; gap: 12px;
  margin-top: 14px; padding-top: 14px;
  border-top: 1px solid var(--border);
  opacity: 0; transform: translateY(6px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}
.tc-output-row.show { opacity: 1; transform: translateY(0); }

/* ---- Animated thermometer ---- */
.tc-thermo-wrap {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
}
.tc-thermo-label {
  font-size: 14px; color: #10b981;
}
body.light-theme .tc-thermo-label { color: #059669; }
.tc-thermo-svg { width: 40px; height: 160px; overflow: visible; }

/* SVG element classes */
.tc-thermo-bg   { fill: var(--bg-3); stroke: var(--border); stroke-width: 1; }
.tc-thermo-fill {
  fill: #10b981;
  transition: height 0.6s cubic-bezier(0.34,1.56,0.64,1),
              y 0.6s cubic-bezier(0.34,1.56,0.64,1),
              fill 0.5s ease;
}
body.light-theme .tc-thermo-fill { fill: #059669; }
.tc-thermo-bulb {
  fill: #10b981;
  transition: fill 0.5s ease;
}
body.light-theme .tc-thermo-bulb { fill: #059669; }
.tc-thermo-tick { stroke: var(--border-hover); stroke-width: 1; }

.tc-thermo-zone {
  font-family: 'DM Mono', monospace; font-size: 9px; font-weight: 700;
  text-align: center; color: var(--text-dim); text-transform: uppercase;
  letter-spacing: 0.06em; writing-mode: vertical-rl;
  transform: rotate(180deg); line-height: 1.2; margin-top: 2px;
  transition: color 0.4s ease;
}

/* ---- All-units panel ---- */
.tc-all-units { display: flex; flex-direction: column; gap: 8px; }
.tc-unit-chip {
  background: var(--bg-2); border: 1px solid var(--border);
  border-radius: 10px; padding: 10px 14px;
  display: grid; grid-template-columns: 36px 1fr auto;
  align-items: center; gap: 8px;
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
}
.tc-unit-chip.active {
  border-color: #10b981; background: rgba(16,185,129,0.06);
  box-shadow: 0 0 0 1px rgba(16,185,129,0.18);
}
body.light-theme .tc-unit-chip.active {
  border-color: #059669; background: rgba(5,150,105,0.05);
  box-shadow: 0 0 0 1px rgba(5,150,105,0.14);
}
.tc-chip-symbol {
  font-family: 'Bricolage Grotesque', sans-serif; font-size: 16px; font-weight: 800;
  color: #10b981; line-height: 1; text-align: center;
}
body.light-theme .tc-chip-symbol { color: #059669; }
.tc-chip-name {
  font-size: 12px; font-weight: 500; color: var(--text-dim);
}
.tc-chip-val {
  font-family: 'Bricolage Grotesque', sans-serif; font-size: 17px; font-weight: 800;
  color: var(--text); text-align: right; line-height: 1;
  transition: color 0.3s ease;
}
.tc-unit-chip.active .tc-chip-val { color: #10b981; }
body.light-theme .tc-unit-chip.active .tc-chip-val { color: #059669; }

/* Value update flash animation */
@keyframes tcValFlash {
  0%   { opacity: 1; }
  30%  { opacity: 0.3; }
  100% { opacity: 1; }
}
.tc-chip-val.updating { animation: tcValFlash 0.25s ease; }

/* ============================================
   BENCHMARKS PANEL
   ============================================ */
.tc-benchmarks {
  margin-top: 12px; background: var(--bg-2); border: 1px solid var(--border);
  border-radius: var(--radius-sm); overflow: hidden;
  opacity: 0; transform: translateY(4px);
  transition: opacity 0.4s ease 0.1s, transform 0.4s ease 0.1s;
}
.tc-benchmarks.show { opacity: 1; transform: translateY(0); }

.tc-bench-label {
  display: flex; align-items: center; gap: 7px; padding: 9px 14px;
  background: var(--bg-3); border-bottom: 1px solid var(--border);
  font-size: 11px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em; color: #10b981;
}
body.light-theme .tc-bench-label { color: #059669; }
.tc-bench-label i { font-size: 12px; }

.tc-bench-list { display: flex; flex-direction: column; }
.tc-bench-item {
  display: grid; grid-template-columns: 18px 1fr auto auto;
  align-items: center; gap: 8px; padding: 8px 14px;
  border-bottom: 1px solid var(--border); font-size: 12px;
  transition: background var(--transition);
}
.tc-bench-item:last-child { border-bottom: none; }
.tc-bench-icon { font-size: 13px; text-align: center; line-height: 1; }
.tc-bench-name { color: var(--text-muted); font-weight: 500; }
.tc-bench-c {
  font-family: 'DM Mono', monospace; font-size: 11px; color: var(--text-dim);
  text-align: right; white-space: nowrap;
}
.tc-bench-f { font-family: 'DM Mono', monospace; font-size: 11px; color: var(--text-dim); text-align: right; white-space: nowrap; }

/* Nearest-match highlight */
.tc-bench-item.nearest {
  background: rgba(16,185,129,0.07); border-left: 2px solid #10b981;
}
body.light-theme .tc-bench-item.nearest { background: rgba(5,150,105,0.05); border-left-color: #059669; }
.tc-bench-item.nearest .tc-bench-name { color: var(--text); font-weight: 600; }
.tc-bench-item.nearest .tc-bench-c,
.tc-bench-item.nearest .tc-bench-f { color: #10b981; font-weight: 600; }
body.light-theme .tc-bench-item.nearest .tc-bench-c,
body.light-theme .tc-bench-item.nearest .tc-bench-f { color: #059669; }

/* Error + clear */
.calc-error {
  display: flex; align-items: center; gap: 10px; padding: 12px 16px;
  background: rgba(251,113,133,0.08); border: 1px solid rgba(251,113,133,0.28);
  border-radius: var(--radius-sm); color: var(--pink);
  font-size: 14px; font-weight: 500; margin: 10px 0 4px;
  opacity: 0; transform: translateY(-6px);
  transition: opacity 0.3s ease, transform 0.3s ease; pointer-events: none;
}
.calc-error.show { opacity: 1; transform: translateY(0); pointer-events: auto; }

.tc-clear-btn {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  width: 100%; padding: 9px 16px; background: transparent;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  color: var(--text-dim); font-family: 'DM Sans', sans-serif;
  font-size: 13px; font-weight: 600; cursor: pointer; margin-top: 10px;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.tc-clear-btn:hover { background: var(--bg-3); border-color: var(--border-hover); color: var(--text); }

/* ============================================
   TOPIC CLUSTER
   ============================================ */
.topic-cluster-section {
  position: relative; z-index: 1; background: var(--bg-2);
  border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
}
.topic-cluster-inner { max-width: 1380px; margin: 0 auto; padding: 56px 24px; }
.topic-cluster-header { max-width: 680px; margin-bottom: 40px; }
.topic-cluster-tag {
  display: inline-flex; align-items: center; gap: 7px; padding: 4px 12px 4px 8px;
  background: rgba(16,185,129,0.10); border: 1px solid rgba(16,185,129,0.24);
  border-radius: 100px; font-size: 12px; font-weight: 600; color: #10b981;
  text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 16px;
}
body.light-theme .topic-cluster-tag { background: rgba(5,150,105,0.07); border-color: rgba(5,150,105,0.20); color: #059669; }
.topic-cluster-header h2 {
  font-family: 'Bricolage Grotesque', sans-serif;
  font-size: clamp(22px,2.5vw,30px); font-weight: 800; letter-spacing: -0.8px;
  color: var(--text); margin-bottom: 12px;
}
.topic-cluster-header p { font-size: 15px; line-height: 1.75; color: var(--text-muted); }

.cluster-grid { display: grid; grid-template-columns: 280px 1fr; gap: 24px; margin-bottom: 40px; align-items: start; }
.cluster-primary {
  background: var(--surface); border: 2px solid #10b981;
  border-radius: var(--radius); padding: 22px; position: relative;
}
body.light-theme .cluster-primary { border-color: #059669; }
.cluster-primary::before {
  content: ''; position: absolute; inset: 0; border-radius: inherit;
  background: linear-gradient(135deg, rgba(16,185,129,0.07) 0%, transparent 60%);
  pointer-events: none;
}
.cluster-primary-label {
  display: inline-flex; align-items: center; gap: 6px; font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.08em; color: #10b981; margin-bottom: 10px;
}
body.light-theme .cluster-primary-label { color: #059669; }
.cluster-primary h3 { font-family: 'Bricolage Grotesque', sans-serif; font-size: 18px; font-weight: 700; color: var(--text); margin-bottom: 8px; position: relative; }
.cluster-primary p  { font-size: 13px; line-height: 1.65; color: var(--text-muted); margin-bottom: 14px; position: relative; }
.cluster-keywords { display: flex; flex-wrap: wrap; gap: 6px; position: relative; }
.cluster-keywords span {
  padding: 3px 9px;
  background: rgba(16,185,129,0.10); border: 1px solid rgba(16,185,129,0.22);
  border-radius: 100px; font-size: 11px; font-weight: 600; color: #10b981;
}
body.light-theme .cluster-keywords span { background: rgba(5,150,105,0.07); border-color: rgba(5,150,105,0.18); color: #059669; }

.cluster-links { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.cluster-links h3 { font-family: 'Bricolage Grotesque', sans-serif; font-size: 14px; font-weight: 700; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.06em; padding: 14px 20px; border-bottom: 1px solid var(--border); background: var(--bg-3); }
.cluster-link-list { display: flex; flex-direction: column; }
.cluster-link-item { display: flex; align-items: center; gap: 14px; padding: 14px 20px; border-bottom: 1px solid var(--border); transition: background var(--transition); }
.cluster-link-item:last-child { border-bottom: none; }
.cluster-link-item:hover { background: var(--bg-3); }
.cluster-link-icon { flex-shrink: 0; width: 34px; height: 34px; border-radius: 8px; background: rgba(16,185,129,0.09); display: flex; align-items: center; justify-content: center; font-size: 15px; color: #10b981; }
body.light-theme .cluster-link-icon { background: rgba(5,150,105,0.07); color: #059669; }
.cluster-link-text { flex: 1; display: flex; flex-direction: column; gap: 2px; }
.cluster-link-text strong { font-size: 14px; font-weight: 600; color: var(--text); }
.cluster-link-text span   { font-size: 12px; color: var(--text-dim); }
.cluster-link-arrow { color: var(--text-dim); font-size: 12px; transition: transform var(--transition), color var(--transition); }
.cluster-link-item:hover .cluster-link-arrow { transform: translateX(3px); color: #10b981; }
body.light-theme .cluster-link-item:hover .cluster-link-arrow { color: #059669; }
.cluster-link-all { background: var(--bg-2); }

.cluster-crosslinks { padding-top: 32px; border-top: 1px solid var(--border); }
.cluster-crosslinks h3 { font-family: 'Bricolage Grotesque', sans-serif; font-size: 18px; font-weight: 700; letter-spacing: -0.3px; color: var(--text); margin-bottom: 6px; }
.cluster-crosslinks > p { font-size: 14px; color: var(--text-muted); margin-bottom: 20px; }
.crosslink-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.crosslink-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 16px; display: flex; flex-direction: column; gap: 8px; transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition); }
.crosslink-card:hover { border-color: #10b981; transform: translateY(-3px); box-shadow: var(--shadow); }
body.light-theme .crosslink-card:hover { border-color: #059669; }
.crosslink-card i { font-size: 20px; color: #10b981; }
body.light-theme .crosslink-card i { color: #059669; }
.crosslink-card strong { font-family: 'Bricolage Grotesque', sans-serif; font-size: 14px; font-weight: 700; color: var(--text); }
.crosslink-card span { font-size: 12px; line-height: 1.5; color: var(--text-dim); }

/* ad + fade */
.ad-slot { position: relative; z-index: 1; max-width: 1380px; margin: 0 auto; padding: 0 24px 40px; }
.ad-slot > div { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.fade-up { opacity: 0; transform: translateY(16px); transition: opacity 0.5s ease, transform 0.5s ease; }
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 1024px) {
  .calc-page { grid-template-columns: 1fr; padding: 32px 20px 60px; gap: 32px; }
  .calc-page-info { position: static; }
  .calc-panel { position: static; order: 2; }
  .calc-page-content { order: 3; }
  .cluster-grid { grid-template-columns: 1fr; }
  .crosslink-grid { grid-template-columns: 1fr 1fr; }
  .temp-formula-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .calc-page { padding: 24px 16px 48px; }
  .crosslink-grid { grid-template-columns: 1fr; }
  .topic-cluster-inner { padding: 36px 16px; }
  .temp-formula-grid { grid-template-columns: 1fr; }
  .tc-unit-row { grid-template-columns: 1fr; }
  .tc-output-row { grid-template-columns: 44px 1fr; gap: 8px; }
}

@media (min-width: 1025px) {
  .calc-page-info {
    grid-row: 1 / 2;
    grid-column: 1 / 2;
  }
  .calc-page-content {
    grid-row: 2 / 3;
    grid-column: 1 / 2;
  }
  .calc-panel {
    grid-row: 1 / 3;
    grid-column: 2 / 3;
    align-self: start;
    position: sticky;
    top: calc(var(--header-h, 68px) + 24px);
  }
}