/* ---- calculator shell ---- */
.calc-hero{display:flex;flex-wrap:wrap;gap:16px;align-items:flex-end;justify-content:space-between;
  padding:22px 0 18px;border-bottom:1px solid var(--border);margin-bottom:18px}
.calc-hero .eyebrow{display:inline-block;font-size:11px;letter-spacing:.14em;font-weight:800;
  color:var(--accent);text-transform:uppercase;margin-bottom:6px}
.calc-hero h1{margin:0 0 6px;font-size:clamp(1.5rem,3vw,2.1rem);line-height:1.15}
.calc-hero p{margin:0;color:var(--text-secondary);max-width:62ch;font-size:.98rem}
.calc-hero-actions{display:flex;gap:8px;flex-wrap:wrap}
.calc-hero-actions button{cursor:pointer;padding:9px 14px;border-radius:10px;font-weight:700;
  font-size:.85rem;border:1px solid var(--border);background:var(--card);color:var(--text)}
.calc-hero-actions button.primary{background:var(--accent);border-color:var(--accent);color:#fff}

/* keep the number reachable while editing */
.calc-mobile-bar{display:none;position:sticky;top:0;z-index:30;gap:12px;align-items:center;
  justify-content:space-between;padding:8px 12px;margin:0 0 12px;border-radius:12px;
  background:var(--card);border:1px solid var(--border);box-shadow:0 6px 18px rgba(0,0,0,.14)}
.calc-mobile-bar span{font-size:.72rem;text-transform:uppercase;letter-spacing:.1em;
  color:var(--text-muted);font-weight:800}
.calc-mobile-bar strong{font-size:1.15rem;font-weight:800}
@media(max-width:900px){.calc-mobile-bar{display:flex}}

.calc-live{display:inline-flex;align-items:center;gap:6px;font-size:.68rem;font-weight:800;
  letter-spacing:.1em;color:#10b981;text-transform:uppercase}
.calc-live::before{content:"";width:7px;height:7px;border-radius:50%;background:#10b981;
  box-shadow:0 0 0 3px rgba(16,185,129,.22)}

.calc-card{background:var(--card);border:1px solid var(--border);border-radius:14px;
  padding:18px 20px;margin:18px 0}
.calc-card h3{margin:0 0 6px;font-size:1rem}
.calc-card>p{margin:0;color:var(--text-secondary);font-size:.9rem}
.calc-kicker{display:block;font-size:.68rem;letter-spacing:.14em;font-weight:800;
  color:var(--accent);text-transform:uppercase;margin-bottom:6px}

.calc-interpret{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:14px}
.calc-interpret>div{padding:12px 14px;border:1px solid var(--border);border-radius:12px;background:var(--bg)}
.calc-interpret span{font-size:.66rem;letter-spacing:.12em;font-weight:800;color:var(--text-muted)}
.calc-interpret strong{display:block;margin:4px 0;font-size:.95rem}
.calc-interpret p{margin:0;font-size:.86rem;color:var(--text-secondary);line-height:1.5}
@media(max-width:700px){.calc-interpret{grid-template-columns:1fr}}

.calc-formula-grid{display:grid;gap:8px;margin-top:12px}
.calc-formula-grid>div{display:flex;gap:12px;align-items:baseline;flex-wrap:wrap}
.calc-formula-grid span{min-width:64px;font-size:.78rem;font-weight:800;color:var(--text-muted)}
.calc-formula-grid code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.84rem;
  background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:6px 10px;overflow-x:auto}
.calc-formula-note{margin:12px 0 0;font-size:.82rem;color:var(--text-muted)}

.calc-steps{display:flex;gap:10px;align-items:stretch;flex-wrap:wrap;margin-top:14px}
.calc-step{display:flex;gap:10px;align-items:center;flex:1 1 200px;padding:11px 13px;border-radius:12px;
  border:1px solid var(--border);background:var(--bg);text-decoration:none;color:inherit;min-width:0}
.calc-step.primary{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 10%,transparent)}
.calc-step.disabled{opacity:.55;pointer-events:none}
.calc-step>span{display:grid;place-items:center;width:26px;height:26px;border-radius:50%;flex:none;
  background:var(--accent);color:#fff;font-size:.8rem;font-weight:800}
.calc-step strong{display:block;font-size:.88rem}
.calc-step small{display:block;font-size:.76rem;color:var(--text-muted)}
.calc-step-arrow{align-self:center;color:var(--text-muted)}
.calc-step:hover{border-color:var(--accent)}
@media(max-width:700px){.calc-step-arrow{display:none}}

.calc-references{margin:16px 0;font-size:.86rem;color:var(--text-secondary);line-height:1.6}
.calc-references p{margin:0 0 8px}
.calc-ref-links a{color:var(--accent);text-decoration:none;margin-right:4px}
.calc-ref-links a:hover{text-decoration:underline}

.calc-note{border-left:3px solid var(--accent);background:var(--card);border-radius:0 12px 12px 0;
  padding:12px 16px;margin:16px 0;font-size:.86rem;color:var(--text-secondary);line-height:1.6}
.calc-note b{color:var(--text)}

.calc-knowledge[hidden],.calc-workflow[hidden]{display:none}
.calc-concept-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin-top:12px}
.calc-concept{padding:12px 14px;border:1px solid var(--border);border-radius:12px;background:var(--bg)}
.calc-concept h4{margin:0 0 5px;font-size:.9rem}
.calc-concept p{margin:0;font-size:.83rem;color:var(--text-secondary);line-height:1.5}
.calc-faq-list{margin-top:12px}
.calc-faq-list details{border-top:1px solid var(--border);padding:9px 0}
.calc-faq-list summary{cursor:pointer;font-weight:700;font-size:.88rem}
.calc-faq-list p{margin:7px 0 0;font-size:.86rem;color:var(--text-secondary);line-height:1.55}

.calc-feedback-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.calc-feedback-row button{cursor:pointer;padding:9px 14px;border-radius:10px;font-weight:700;
  font-size:.84rem;border:1px solid var(--border);background:var(--bg);color:var(--text)}
.calc-feedback-row button:hover{border-color:var(--accent);color:var(--accent)}
.calc-feedback-row button.ghost{background:transparent}
.calc-feedback-thanks{margin-top:10px;font-size:.86rem;color:#10b981;font-weight:700}
.calc-feedback-note{display:block;margin-top:10px;font-size:.84rem;color:var(--text-secondary)}
.calc-feedback-note textarea{display:block;width:100%;margin-top:6px;padding:9px 11px;
  border:1px solid var(--border);border-radius:10px;background:var(--bg);color:var(--text);
  font:inherit;font-size:.86rem;resize:vertical}

.calc-footer-tools{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:18px;margin-top:18px}
.calc-footer-group h3{margin:0 0 8px;font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;color:var(--text-muted)}
.calc-footer-group ul{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.calc-footer-group a{font-size:.86rem;color:var(--text-secondary);text-decoration:none}
.calc-footer-group a:hover{color:var(--accent)}