/* ===== Layout ===== */
.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px 60px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.lead {
  text-align: center;
  color: var(--muted-color);
  font-size: 1rem;
  margin: -8px 0 0;
}

/* ===== Section header ===== */
.sec-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.sec-header h2 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0;
  color: #1a202c;
  letter-spacing: 0;
  text-shadow: none;
  text-align: left;
}

/* ===== Badges ===== */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: .78rem;
  font-weight: 700;
  white-space: nowrap;
}

.fn-badge    { background: #d1fae5; color: #065f46; }
.def-badge   { background: #ede9fe; color: #5b21b6; }
.arg-badge   { background: #fef3c7; color: #92400e; }
.multi-badge { background: #dbeafe; color: #1e40af; }

/* ===== Concept text ===== */
.concept-desc {
  color: #374151;
  line-height: 1.75;
  margin-bottom: 8px;
}

.concept-desc code {
  background: #f1f5f9;
  padding: 1px 5px;
  border-radius: 4px;
  font-size: .9em;
}

/* ===== Code block ===== */
.code-block {
  background: #1e293b;
  border-radius: 10px;
  overflow: hidden;
  margin-top: 16px;
}

.code-label {
  background: #334155;
  color: #94a3b8;
  font-size: 11px;
  font-weight: 600;
  padding: 4px 12px;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.code-block pre { margin: 0; padding: 14px 16px; overflow-x: auto; }

.code-block code {
  color: #e2e8f0;
  font-size: .9rem;
  font-family: "Fira Code", "Consolas", monospace;
  line-height: 1.65;
}

/* ===== Concept note ===== */
.concept-note {
  background: #f0f9ff;
  border-left: 4px solid var(--brand);
  border-radius: 0 8px 8px 0;
  padding: 10px 14px;
  font-size: .9rem;
  color: #374151;
  margin-top: 14px;
  line-height: 1.6;
}

.concept-note code {
  background: #e0f2fe;
  padding: 1px 5px;
  border-radius: 4px;
  font-size: .88em;
}

/* ===== Controls ===== */
.controls-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.ctrl-lbl {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: .9rem;
  color: var(--muted-color);
}

.demo-input {
  padding: 8px 10px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  width: 90px;
}

.action-btn {
  padding: 8px 18px;
  border: none;
  border-radius: 8px;
  font-size: .95rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: transform .1s, filter .15s;
}

.action-btn:active  { transform: scale(.97); }
.action-btn:disabled { opacity: .4; cursor: default; }

.fn-btn    { background: #059669; color: #fff; }
.fn-btn:hover    { filter: brightness(1.12); }
.arg-btn   { background: #d97706; color: #fff; }
.arg-btn:hover   { filter: brightness(1.12); }
.multi-btn { background: #2563eb; color: #fff; }
.multi-btn:hover { filter: brightness(1.12); }
.reset-btn { background: #e2e8f0; color: #475569; }
.reset-btn:hover { filter: brightness(.95); }

/* ===== Machine demo ===== */
.machine-demo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin: 20px 0 4px;
  flex-wrap: wrap;
}

.machine-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.machine-col-lbl {
  font-size: .72rem;
  font-weight: 700;
  color: var(--muted-color);
  text-transform: uppercase;
  letter-spacing: .06em;
}

.machine-val {
  min-width: 58px;
  padding: 10px 12px;
  border: 2px solid #cbd5e1;
  border-radius: 10px;
  background: #f8fafc;
  text-align: center;
  font-size: 1.4rem;
  font-weight: 700;
  color: #1a202c;
}

.in-val  { border-color: #93c5fd; background: #eff6ff; color: #1e40af; }
.out-val { border-color: #6ee7b7; background: #f0fdf4; color: #065f46; }

.machine-arrow-wrap {
  width: 44px;
  height: 24px;
  color: #94a3b8;
  flex-shrink: 0;
}

.machine-arrow-wrap svg { width: 100%; height: 100%; }

.machine-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 108px;
  height: 80px;
  border: 2.5px solid #10b981;
  border-radius: 16px;
  background: #ecfdf5;
  flex-shrink: 0;
}

.machine-fn-name {
  font-size: .88rem;
  font-weight: 700;
  color: #065f46;
}

.machine-fn-op {
  font-size: .8rem;
  color: #6b7280;
  font-family: "Fira Code", "Consolas", monospace;
}

/* Multi-inputs side-by-side column */
.multi-inputs {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* Machine animations */
@keyframes machineRing {
  0%   { box-shadow: 0 0 0 0   rgba(16,185,129,.7); }
  100% { box-shadow: 0 0 0 20px rgba(16,185,129,0); }
}

@keyframes popIn {
  0%   { transform: scale(.4); opacity: 0; }
  65%  { transform: scale(1.2); }
  100% { transform: scale(1);   opacity: 1; }
}

.machine-box.running { animation: machineRing .5s ease-out; }
.machine-val.pop     { animation: popIn .35s cubic-bezier(.34,1.56,.64,1); }

/* ===== Anatomy diagram ===== */
.anatomy-layout {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  align-items: flex-start;
  margin: 14px 0 4px;
}

.anatomy-code {
  background: #1e293b;
  border-radius: 12px;
  padding: 16px 20px;
  font-family: "Fira Code", "Consolas", monospace;
  font-size: 1rem;
  line-height: 2;
  flex-shrink: 0;
}

.anat-line { white-space: nowrap; }
.anat-indent { transition: background .2s, border-radius .2s; }
.anat-indent.hl-body { background: rgba(148,163,184,.18); border-radius: 6px; }

/* Code span base colors (dark bg) */
.sp-kw    { color: #c084fc; transition: background .15s, border-radius .1s, padding .1s; }
.sp-name  { color: #4ade80; transition: background .15s, border-radius .1s, padding .1s; }
.sp-param { color: #fbbf24; transition: background .15s, border-radius .1s, padding .1s; }
.sp-paren { color: #94a3b8; }
.sp-plain { color: #e2e8f0; }

/* Highlight states */
.sp-kw.hl    { background: rgba(192,132,252,.35); border-radius: 4px; padding: 1px 3px; }
.sp-name.hl  { background: rgba(74,222,128,.35);  border-radius: 4px; padding: 1px 3px; }
.sp-param.hl { background: rgba(251,191,36,.35);  border-radius: 4px; padding: 1px 3px; }

/* Legend */
.anat-legend {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
  min-width: 180px;
}

.anat-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 8px;
  border-radius: 8px;
  cursor: default;
  transition: background .15s;
}

.anat-row:hover { background: #f1f5f9; }

.anat-chip {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 6px;
  font-family: "Fira Code", "Consolas", monospace;
  font-size: .8rem;
  font-weight: 700;
  flex-shrink: 0;
  white-space: nowrap;
}

.kw-chip     { background: #ede9fe; color: #7c3aed; }
.name-chip   { background: #d1fae5; color: #065f46; }
.param-chip  { background: #fef3c7; color: #92400e; }
.body-chip   { background: #f1f5f9; color: #475569; }

.anat-desc {
  font-size: .85rem;
  color: #475569;
}

/* ===== Step flow ===== */
.step-flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin: 16px 0 4px;
}

@media (max-width: 520px) {
  .step-flow { grid-template-columns: repeat(2, 1fr); }
}

.flow-card {
  border: 2px solid #e2e8f0;
  border-radius: 14px;
  padding: 14px 10px;
  background: #f8fafc;
  text-align: center;
  opacity: .3;
  transition: opacity .3s, border-color .3s, background .3s, transform .3s;
}

@keyframes cardPop {
  0%  { transform: translateY(-6px) scale(.97); opacity: 0; }
  100%{ transform: translateY(0)   scale(1);    opacity: 1; }
}

.flow-card.active {
  opacity: 1;
  border-color: #10b981;
  background: #ecfdf5;
  animation: cardPop .3s ease-out;
}

.fs-num {
  font-size: 1.2rem;
  margin-bottom: 4px;
}

.fs-title {
  font-size: .72rem;
  font-weight: 700;
  color: #059669;
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-bottom: 8px;
}

.fs-code {
  font-family: "Fira Code", "Consolas", monospace;
  font-size: .85rem;
  color: #1e293b;
  line-height: 1.5;
  margin-bottom: 6px;
}

.fs-code mark {
  background: #fef08a;
  border-radius: 3px;
  padding: 0 2px;
}

.flow-card.active .fs-code mark {
  background: #10b981;
  color: #fff;
}

.fs-result {
  font-size: 1.5rem !important;
  font-weight: 700;
}

.fs-note {
  font-size: .75rem;
  color: #6b7280;
  margin-top: 4px;
}