/* =========================================================
   StudyPipe · StudyMath (math.css)
   Offline LaTeX Mathematical Typesetting & Step-by-Step
   Calculation Explainer Cards (Phone-first 360×740 safe)
   ========================================================= */

/* ---------- 1. Core LaTeX Math Typography ---------- */
.sp-math {
  font-family: var(--font-math);
  font-variant-numeric: lining-nums;
  line-height: 1.35;
  letter-spacing: 0.01em;
  color: inherit;
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.14em;
  vertical-align: middle;
}

.sp-math-display {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  flex-wrap: wrap;
  gap: 0.22em;
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  padding: 4px 2px;
  font-size: 1.08rem;
  box-sizing: border-box;
}

.sp-var {
  font-family: var(--font-math);
  font-style: italic;
  font-weight: 500;
  padding: 0 0.03em;
}

.sp-num-lit {
  font-family: var(--font-mono);
  font-style: normal;
  font-weight: 600;
}

.sp-fn {
  font-family: var(--font-body);
  font-style: normal;
  font-weight: 700;
  margin-right: 0.08em;
}

.sp-op {
  font-family: var(--font-mono);
  font-style: normal;
  font-weight: 600;
  padding: 0 0.16em;
  color: var(--teal, var(--teal));
}

.sp-sign {
  font-family: var(--font-math, serif);
  font-style: normal;
  font-weight: 600;
  margin-right: -0.16em;
  padding: 0 0 0 0.1em;
  color: var(--teal, var(--teal));
}
.eq.light .sp-sign,
.m-step-eq.light .sp-sign,
.qexp .sp-sign,
.dn-a .sp-sign,
.reveal-body .sp-sign { color: var(--ok); }

.eq.light .sp-op,
.m-step-eq.light .sp-op,
.qexp .sp-op,
.dn-a .sp-op,
.reveal-body .sp-op {
  color: var(--ok);
}

.sp-text {
  font-family: var(--font-body);
  font-style: normal;
  font-weight: 600;
  font-size: 0.92em;
  padding: 0 0.12em;
}

.sp-unit {
  font-family: var(--font-mono);
  font-style: normal;
  font-weight: 600;
  font-size: 0.88em;
  margin-left: 0.18em;
  opacity: 0.92;
}

/* Stacked Fractions: \frac{num}{den} */
.sp-frac {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  vertical-align: middle;
  text-align: center;
  margin: 0.12em 0.22em;
  font-size: 0.94em;
  line-height: 1.15;
}

.sp-frac > .sp-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.06em 0.34em 0.14em;
  border-bottom: 1.6px solid currentColor;
  width: 100%;
  box-sizing: border-box;
  white-space: nowrap;
}

.sp-frac > .sp-den {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.14em 0.34em 0.06em;
  width: 100%;
  box-sizing: border-box;
  white-space: nowrap;
}

/* Square Roots & N-th Roots: \sqrt{...} */
.sp-sqrt {
  display: inline-flex;
  align-items: stretch;
  vertical-align: middle;
  margin: 0.08em 0.14em;
}

.sp-sqrt > .sp-rad {
  font-family: Georgia, "Times New Roman", serif;
  font-style: normal;
  font-weight: 700;
  font-size: 1.18em;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  padding-right: 0.03em;
  user-select: none;
}

.sp-sqrt > .sp-radicand {
  display: inline-flex;
  align-items: center;
  border-top: 1.6px solid currentColor;
  padding: 0.1em 0.24em 0.04em 0.14em;
}

/* Superscripts & Subscripts */
.sp-sup {
  font-size: 0.74em;
  line-height: 0;
  position: relative;
  top: -0.48em;
  margin-left: 0.03em;
  font-style: normal;
}

.sp-sub {
  font-size: 0.74em;
  line-height: 0;
  position: relative;
  bottom: -0.26em;
  margin-left: 0.03em;
  font-style: normal;
}

.sp-supsub {
  display: inline-flex;
  flex-direction: column;
  vertical-align: middle;
  font-size: 0.72em;
  line-height: 1.05;
  margin-left: 0.04em;
  text-align: left;
}

/* Boxed Final Answer: \boxed{...} */
.sp-boxed {
  display: inline-flex;
  align-items: center;
  gap: 0.14em;
  padding: 0.18em 0.52em;
  border-radius: calc(7px * var(--corner, 1));
  border: 1.8px solid #10b981;
  background: rgba(16, 185, 129, 0.13);
  color: inherit;
  font-weight: 700;
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.14);
}

/* ---------- 2. Step-by-Step Calculation & Explainer Cards ---------- */
.m-calc-wrap {
  margin: 10px 0 12px;
  border-radius: calc(12px * var(--corner, 1));
  border: 1px solid rgba(15, 23, 42, 0.12);
  background: rgba(255, 255, 255, 0.72);
  overflow: hidden;
  max-width: 100%;
  box-sizing: border-box;
}

/* Dark container adaptation (e.g. inside dark cards or Welcome Hub) */
.stage .m-calc-wrap,
.eq-card .m-calc-wrap,
.vt .m-calc-wrap,
.bridge-card .m-calc-wrap {
  background: rgba(var(--ink-900-rgb), 0.78);
  border-color: rgba(255, 255, 255, 0.14);
  color: var(--paper);
}

.m-calc-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 6px;
  padding: 7px 12px;
  background: rgba(var(--ok-rgb), 0.09);
  border-bottom: 1px solid rgba(var(--ok-rgb), 0.18);
  font-family: var(--font-body);
  font-size: 0.76rem;
  font-weight: 700;
  color: #0b6e58;
  letter-spacing: 0.02em;
}

.stage .m-calc-head,
.eq-card .m-calc-head,
.vt .m-calc-head {
  background: rgba(var(--teal-rgb), 0.12);
  color: var(--teal);
}

.m-tex-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 7px;
  border-radius: 999px;
  background: rgba(var(--ok-rgb), 0.14);
  color: #0b6e58;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
}

.m-step-list {
  display: flex;
  flex-direction: column;
  divide-y: 1px solid rgba(15, 23, 42, 0.08);
}

.m-step {
  padding: 10px 13px;
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
  display: flex;
  flex-direction: column;
  gap: 6px;
  box-sizing: border-box;
  max-width: 100%;
}

.m-step:last-child {
  border-bottom: none;
  background: rgba(16, 185, 129, 0.05);
}

.m-step-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
}

.m-step-num {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 0.71rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ok);
}

.m-step-num b {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  border-radius: 999px;
  background: var(--ok);
  color: #ffffff;
  font-size: 0.67rem;
}

.m-step-tag {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 700;
  color: #475569;
  background: rgba(15, 23, 42, 0.06);
  padding: 1px 8px;
  border-radius: 999px;
}

.m-step-eq {
  padding: 8px 11px;
  border-radius: calc(8px * var(--corner, 1));
  background: rgba(15, 23, 42, 0.04);
  border-left: 3px solid var(--ok);
  color: #0f172a;
  font-size: 1.03rem;
  overflow-x: auto;
  max-width: 100%;
  box-sizing: border-box;
}

.stage .m-step-eq,
.eq-card .m-step-eq,
.vt .m-step-eq {
  background: rgba(255, 255, 255, 0.06);
  color: #f8fafc;
  border-left-color: var(--teal);
}

.m-step-note {
  display: block;
  font-family: var(--font-body);
  font-size: 0.84rem;
  line-height: 1.48;
  color: #334155;
  padding: 6px 10px;
  background: rgba(245, 158, 11, 0.07);
  border-radius: calc(6px * var(--corner, 1));
  border-left: 2.5px solid #f59e0b;
}

.stage .m-step-note,
.eq-card .m-step-note,
.vt .m-step-note {
  color: #cbd5e1;
  background: rgba(245, 158, 11, 0.12);
}

.m-step-note-icon {
  font-style: normal;
  font-size: 0.86rem;
  line-height: 1.3;
  margin-right: 6px;
}

/* ---------- 3. Explainer Note Underneath Concept Formula Banners (.eq) ---------- */
.eq-latex-wrap {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  max-width: 100%;
  white-space: normal;
  box-sizing: border-box;
}

.m-eq-note {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-top: 6px;
  padding: 9px 12px;
  border-radius: calc(8px * var(--corner, 1));
  background: rgba(var(--teal-rgb), 0.12);
  border-left: 3px solid var(--teal);
  font-family: var(--font-body);
  font-size: 0.83rem;
  font-weight: 500;
  line-height: 1.48;
  color: #f1f5f9;
  text-align: left;
  white-space: normal !important;
  word-break: break-word;
  box-sizing: border-box;
}

.m-eq-note strong {
  color: var(--teal) !important;
  font-weight: 700;
}

.eq.light .m-eq-note {
  background: rgba(var(--ok-rgb), 0.09);
  border-left-color: var(--ok);
  color: #1e293b;
}

.eq.light .m-eq-note strong {
  color: #0b6e58 !important;
}

/* Worked example steps-sol reset when upgraded to LaTeX step cards */
ol.steps-sol > li.m-upgraded-li {
  list-style: none !important;
  margin-left: 0 !important;
  padding-left: 0 !important;
  margin-bottom: 16px;
}

ol.steps-sol > li.m-upgraded-li::before,
.steps-sol > li.m-upgraded-li::before {
  content: none !important;
  display: none !important;
}

ol.steps-sol:has(> li.m-upgraded-li) {
  padding-left: 0;
  list-style: none;
}

.m-subgoal-title {
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 7px;
}

.m-subgoal-title::before {
  content: "▸";
  color: var(--ok);
  font-size: 1rem;
}