/* ============================================================
   Atomify · v2 · calcule (page)
   ------------------------------------------------------------
   Six interactive calculators for crystal-growth physics, with
   MathJax-rendered formulas. Relies on core.css + components.css.
   ============================================================ */

/* ─── 1 · Page-level prose with inline math ───────────── */
.calc-prose {
  color: var(--ink-soft);
  font-size: 0.98rem;
  line-height: 1.7;
  max-width: 68ch;
  margin: 0 0 1.5rem;
}
.calc-prose strong { color: var(--ink); font-weight: 600; }
.calc-prose em { color: var(--ink-2); font-style: italic; }
.calc-prose .calc-display-math {
  display: block;
  margin: 1rem 0;
  padding: 0.5rem 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.calc-prose mjx-container[display="true"] {
  margin: 0.85rem 0 !important;
  overflow-x: auto;
  max-width: 100%;
}
.calc-prose ul {
  margin: 0.6rem 0 1.1rem;
  padding-left: 1.3rem;
  color: var(--ink-soft);
}
.calc-prose ul li { margin-bottom: 0.4rem; }

/* ─── 2 · Calculator panel ───────────────────────────── */
.calc-panel {
  margin-top: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--r-4);
  background: var(--paper-2);
  overflow: hidden;
}

.calc-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  flex-wrap: wrap;
}
.calc-panel-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.calc-panel-meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
}

/* ─── 3 · Field grid ──────────────────────────────────── */
.calc-fields {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0;
  padding: 0;
  border-bottom: 1px solid var(--line);
}
.calc-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 0.95rem 1.25rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line-soft);
  background: var(--paper-2);
}
.calc-field:last-child { border-bottom: 0; }
@media (min-width: 720px) {
  .calc-field:nth-child(2n) { border-right: 0; }
}
.calc-field-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-muted);
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
  flex-wrap: wrap;
  line-height: 1.35;
}
.calc-field-label sub, .calc-field-label sup { font-size: 0.85em; }
.calc-field-label .calc-sym {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 500;
  font-size: 0.9rem;
  letter-spacing: -0.01em;
  text-transform: none;
  color: var(--ink);
}
.calc-field-label .calc-unit {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
  text-transform: none;
}
.calc-input {
  width: 100%;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-2);
  padding: 0.55rem 0.75rem;
  font-family: var(--font-mono);
  font-feature-settings: "tnum";
  font-size: 0.92rem;
  color: var(--ink);
  outline: none;
  transition: border-color 180ms ease, box-shadow 180ms ease, background-color 180ms ease;
}

/* Live "as you type" preview — rendered as HTML (not MathJax) for zero-lag updates.
   Shows up only when the value is in scientific notation (1e29 → 1 × 10²⁹). */
.calc-input-preview {
  font-family: var(--font-display);
  font-variation-settings: "opsz" 12;
  font-style: italic;
  font-weight: 400;
  font-size: 0.86rem;
  letter-spacing: -0.005em;
  color: var(--green-deep);
  line-height: 1;
  min-height: 1rem;
  display: flex;
  align-items: center;
  gap: 0.32rem;
  margin-top: 2px;
  opacity: 1;
  transition: opacity 180ms ease;
}
.calc-input-preview:empty { opacity: 0; }
.calc-input-preview::before {
  content: '≡';
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 0.7rem;
  color: var(--ink-muted);
  letter-spacing: 0;
}
.calc-input-preview .preview-mantissa { font-family: var(--font-display); }
.calc-input-preview .preview-mult {
  display: inline-block;
  margin: 0 0.18em;
  color: var(--ink-2);
  font-style: normal;
  font-family: var(--font-body);
  font-size: 0.78em;
}
.calc-input-preview .preview-base { font-family: var(--font-display); }
.calc-input-preview sup {
  font-size: 0.62em;
  vertical-align: super;
  line-height: 0;
  margin-left: 0.06em;
  font-style: normal;
  font-family: var(--font-mono);
  font-feature-settings: "tnum";
}
[data-theme="dark"] .calc-input-preview,
body.dark-mode .calc-input-preview { color: var(--green); }
.calc-input::placeholder { color: var(--ink-muted); }
.calc-input:focus {
  border-color: var(--green-deep);
  box-shadow: var(--focus-ring);
  background: var(--paper);
}
[data-theme="dark"] .calc-input:focus,
body.dark-mode .calc-input:focus { border-color: var(--green); }
.calc-input::-webkit-outer-spin-button,
.calc-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.calc-input[type="number"] {
  -moz-appearance: textfield;
  appearance: textfield;
}

/* Field group divider (e.g. Avrami: required vs optional) */
.calc-fields-divider {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 1.25rem;
  background: var(--paper);
  border-bottom: 1px solid var(--line-soft);
  border-top: 1px solid var(--line);
}
.calc-fields-divider-text {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.calc-fields-divider::before,
.calc-fields-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--line);
  max-width: 40px;
}

/* ─── 4 · Action row ─────────────────────────────────── */
.calc-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.85rem 1.25rem;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}
.calc-actions-hint {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
}
.calc-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.1rem;
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  border-radius: var(--r-2);
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: background-color 150ms, border-color 150ms;
}
.calc-cta svg { width: 14px; height: 14px; }
.calc-cta:hover { background: var(--green-deep); border-color: var(--green-deep); }
[data-theme="dark"] .calc-cta,
body.dark-mode .calc-cta {
  background: var(--green);
  color: #0B1220;
  border-color: var(--green);
}
[data-theme="dark"] .calc-cta:hover,
body.dark-mode .calc-cta:hover {
  background: var(--green-bright);
  border-color: var(--green-bright);
}

/* ─── 5 · Output (MathJax-rendered) ───────────────────── */
.calc-output {
  padding: 1.25rem 1.5rem 1.35rem;
  background: var(--paper-2);
  min-height: 56px;
  color: var(--ink);
  position: relative;
  font-family: var(--font-body);
  font-size: 0.96rem;
  line-height: 1.55;
}
.calc-output:empty::before {
  content: 'Rezultatul apare aici după ce apeși „Calculează".';
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
  font-style: italic;
}
.calc-output:not(:empty) {
  border-left: 3px solid var(--green-deep);
  background:
    linear-gradient(90deg, var(--green-tint) 0%, transparent 30%),
    var(--paper-2);
  animation: calc-rise 0.4s var(--ease-out) both;
}
[data-theme="dark"] .calc-output:not(:empty),
body.dark-mode .calc-output:not(:empty) { border-left-color: var(--green); }
@keyframes calc-rise {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}
.calc-output mjx-container[display="true"] {
  display: block;
  margin: 0.15rem 0 !important;
  overflow-x: auto;
  max-width: 100%;
  padding-bottom: 4px;
  scrollbar-width: thin;
  scrollbar-color: var(--ink-3) transparent;
}
.calc-output mjx-container[display="true"]::-webkit-scrollbar { height: 5px; }
.calc-output mjx-container[display="true"]::-webkit-scrollbar-track { background: transparent; }
.calc-output mjx-container[display="true"]::-webkit-scrollbar-thumb {
  background: var(--ink-3);
  border-radius: 3px;
}
.calc-output mjx-container { color: var(--ink); }

.calc-output--error:not(:empty) {
  border-left-color: var(--amber);
  background:
    linear-gradient(90deg, var(--amber-tint) 0%, transparent 35%),
    var(--paper-2);
}
.calc-output--error mjx-container { color: var(--amber); }

/* Output internal structure: header + step view */
.calc-result-head {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.4rem;
}
.calc-result-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--green-deep);
}
.calc-result-eyebrow--error { color: var(--amber); }
[data-theme="dark"] .calc-result-eyebrow,
body.dark-mode .calc-result-eyebrow { color: var(--green); }
.calc-result-head::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--line);
}

.calc-step {
  padding: 0.55rem 0 0.35rem;
  position: relative;
}
.calc-step + .calc-step {
  margin-top: 0.3rem;
  border-top: 1px dashed var(--line);
}
.calc-step-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 0.1rem;
}
.calc-step--final .calc-step-label {
  color: var(--green-deep);
}
[data-theme="dark"] .calc-step--final .calc-step-label,
body.dark-mode .calc-step--final .calc-step-label { color: var(--green); }
.calc-step--final mjx-container[display="true"] {
  font-weight: 500;
}

/* ─── 6 · Static info chapter (Navier–Stokes) ─────────── */
.calc-regime-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0;
  margin-top: 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--r-3);
  overflow: hidden;
  background: var(--paper-2);
}
.calc-regime {
  padding: 1.1rem 1.25rem 1.2rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper-2);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.calc-regime-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.calc-regime-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--ink);
  line-height: 1.2;
}
.calc-regime-body {
  font-size: 0.9rem;
  color: var(--ink-soft);
  line-height: 1.55;
}
.calc-regime-body mjx-container { margin: 0.3rem 0 !important; }

/* ─── 7 · Misc ────────────────────────────────────────── */
.calc-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.6rem;
  margin: 0 0 1.25rem;
  padding: 0;
}
.calc-toc a {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-2);
  text-decoration: none;
  transition: background-color 150ms, border-color 150ms, color 150ms;
}
.calc-toc a:hover {
  background: var(--paper-tint);
  border-color: var(--line-strong);
  color: var(--ink);
}
.calc-toc a.is-active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
[data-theme="dark"] .calc-toc a.is-active,
body.dark-mode .calc-toc a.is-active {
  background: var(--green);
  color: #0B1220;
  border-color: var(--green);
}