.ff-material-panel {
  --ff-orange: #f59e62;
  --ff-cyan: #5fc9d4;
  --ff-sand: #d9bd8c;
  position: relative;
  margin-bottom: 1rem;
  padding: 1rem;
  overflow: hidden;
  border: 1px solid rgba(95, 201, 212, 0.22);
  border-radius: 1rem;
  background:
    linear-gradient(135deg, rgba(95, 201, 212, 0.08), transparent 38%),
    linear-gradient(315deg, rgba(245, 158, 98, 0.07), transparent 42%),
    #182235;
  box-shadow: 0 18px 50px rgba(2, 8, 23, 0.18);
  color: #eef4f7;
}

.ff-material-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.16;
  background-image: repeating-linear-gradient(135deg, transparent 0 12px, rgba(255, 255, 255, 0.05) 12px 13px);
}

.ff-material-heading,
.ff-material-stack {
  position: relative;
  z-index: 1;
}

.ff-material-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.9rem;
}

.ff-material-kicker {
  display: block;
  margin-bottom: 0.2rem;
  color: var(--ff-cyan);
  font-size: 0.64rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.ff-material-heading h3 {
  margin: 0;
  font-family: "Arial Narrow", "Roboto Condensed", sans-serif;
  font-size: 1.18rem;
  font-stretch: condensed;
  font-weight: 800;
  letter-spacing: 0.015em;
}

.ff-material-heading p {
  margin: 0.2rem 0 0;
  color: rgba(226, 232, 240, 0.55);
  font-size: 0.74rem;
}

.ff-material-formula {
  flex: 0 0 auto;
  padding: 0.45rem 0.65rem;
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 0.7rem;
  background: rgba(5, 12, 25, 0.38);
  text-align: right;
}

.ff-material-formula span,
.ff-material-formula small {
  display: block;
}

.ff-material-formula span {
  color: var(--ff-orange);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.72rem;
  font-weight: 800;
}

.ff-material-formula small {
  margin-top: 0.08rem;
  color: rgba(226, 232, 240, 0.42);
  font-size: 0.58rem;
}

.ff-material-stack {
  display: grid;
  gap: 0.65rem;
}

.ff-material-card {
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 0.85rem;
  background: rgba(8, 16, 31, 0.56);
  transition: border-color 180ms ease, background-color 180ms ease, transform 180ms ease;
}

.ff-material-card[open] {
  border-color: color-mix(in srgb, var(--material-accent) 42%, transparent);
  background: rgba(10, 19, 35, 0.88);
}

.ff-material-card--orange { --material-accent: var(--ff-orange); }
.ff-material-card--cyan { --material-accent: var(--ff-cyan); }
.ff-material-card--sand { --material-accent: var(--ff-sand); }

.ff-material-summary {
  display: grid;
  grid-template-columns: 2.55rem minmax(0, 1fr) auto 1.35rem;
  align-items: center;
  gap: 0.65rem;
  min-height: 3.8rem;
  padding: 0.55rem 0.7rem;
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.ff-material-summary::-webkit-details-marker { display: none; }

.ff-material-summary:focus-visible {
  outline: 2px solid var(--material-accent);
  outline-offset: 3px;
  border-radius: 0.7rem;
}

.ff-material-summary__icon {
  display: grid;
  width: 2.55rem;
  height: 2.55rem;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--material-accent) 35%, transparent);
  border-radius: 0.7rem;
  background: color-mix(in srgb, var(--material-accent) 10%, transparent);
  color: var(--material-accent);
}

.ff-material-summary__icon svg { width: 1.35rem; height: 1.35rem; }
.ff-material-summary__copy { min-width: 0; }
.ff-material-summary__copy strong { display: block; color: #f8fafc; font-size: 0.85rem; }
.ff-material-summary__copy small { display: block; overflow: hidden; color: rgba(226, 232, 240, 0.46); font-size: 0.65rem; text-overflow: ellipsis; white-space: nowrap; }

.ff-material-density {
  padding: 0.25rem 0.42rem;
  border-radius: 0.4rem;
  background: color-mix(in srgb, var(--material-accent) 10%, transparent);
  color: var(--material-accent);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.65rem;
  font-weight: 800;
}

.ff-material-chevron {
  display: grid;
  place-items: center;
  color: rgba(226, 232, 240, 0.42);
  transition: transform 180ms ease;
}

.ff-material-chevron svg { width: 1.15rem; height: 1.15rem; }
.ff-material-card[open] .ff-material-chevron { transform: rotate(180deg); }

.ff-material-body {
  padding: 0.15rem 0.7rem 0.75rem;
  animation: ff-material-reveal 180ms ease both;
}

@keyframes ff-material-reveal {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.ff-material-fields {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0.55rem;
  padding-top: 0.65rem;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
}

.ff-material-field:nth-child(-n + 3) { grid-column: span 2; }
.ff-material-field:nth-child(n + 4) { grid-column: span 3; }

.ff-material-field__label {
  display: block;
  margin: 0 0 0.28rem 0.08rem;
  color: rgba(226, 232, 240, 0.62);
  font-size: 0.65rem;
  font-weight: 700;
}

.ff-material-input-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  min-height: 2.85rem;
  overflow: hidden;
  border: 1px solid rgba(148, 163, 184, 0.22);
  border-radius: 0.65rem;
  background: #101a2b;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.ff-material-input-wrap:focus-within {
  border-color: var(--material-accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--material-accent) 12%, transparent);
}

.ff-material-input {
  width: 100%;
  min-width: 0;
  min-height: 2.75rem;
  padding: 0.5rem 0.35rem 0.5rem 0.72rem;
  border: 0;
  outline: 0;
  background: transparent;
  color: #f8fafc;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9rem;
  font-weight: 750;
}

.ff-material-input::placeholder { color: rgba(148, 163, 184, 0.28); }
.ff-material-input::-webkit-inner-spin-button { margin: 0; opacity: 0.35; }

.ff-material-unit {
  padding-right: 0.65rem;
  color: rgba(226, 232, 240, 0.4);
  font-size: 0.63rem;
  font-weight: 800;
}

.ff-material-results {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr)) minmax(0, 1.3fr);
  gap: 0.45rem;
  margin-top: 0.7rem;
}

.ff-material-result {
  min-width: 0;
  padding: 0.55rem 0.6rem;
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 0.65rem;
  background: rgba(255, 255, 255, 0.035);
}

.ff-material-result > span {
  display: block;
  overflow: hidden;
  color: rgba(226, 232, 240, 0.45);
  font-size: 0.58rem;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.ff-material-result strong {
  display: flex;
  align-items: baseline;
  gap: 0.24rem;
  margin-top: 0.12rem;
  color: #f8fafc;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.82rem;
}

.ff-material-result small { color: rgba(226, 232, 240, 0.34); font-size: 0.54rem; }

.ff-material-result--primary {
  border-color: color-mix(in srgb, var(--material-accent) 30%, transparent);
  background: color-mix(in srgb, var(--material-accent) 9%, transparent);
}

.ff-material-result--primary > span,
.ff-material-result--primary strong { color: var(--material-accent); }
.ff-material-card--ready .ff-material-result--primary { box-shadow: inset 3px 0 0 var(--material-accent); }

.ff-material-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  margin-top: 0.65rem;
}

.ff-material-actions p {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin: 0;
  color: rgba(226, 232, 240, 0.37);
  font-size: 0.61rem;
}

.ff-material-actions p svg { width: 0.8rem; height: 0.8rem; }

.ff-material-clear {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  min-height: 2.55rem;
  padding: 0.45rem 0.8rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 0.6rem;
  background: rgba(255, 255, 255, 0.04);
  color: rgba(241, 245, 249, 0.72);
  font-size: 0.68rem;
  font-weight: 800;
  cursor: pointer;
  transition: transform 150ms ease, border-color 150ms ease, color 150ms ease;
}

.ff-material-clear:hover { border-color: var(--material-accent); color: var(--material-accent); }
.ff-material-clear:active { transform: scale(0.97); }
.ff-material-clear:focus-visible { outline: 2px solid var(--material-accent); outline-offset: 2px; }
.ff-material-clear svg { width: 0.9rem; height: 0.9rem; }

@media (max-width: 540px) {
  .ff-material-panel { padding: 0.75rem; border-radius: 0.9rem; }
  .ff-material-heading { align-items: flex-start; }
  .ff-material-formula { display: none; }
  .ff-material-summary { grid-template-columns: 2.45rem minmax(0, 1fr) 1.2rem; gap: 0.55rem; min-height: 4.05rem; }
  .ff-material-density { display: none; }
  .ff-material-fields { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ff-material-field:nth-child(-n + 3),
  .ff-material-field:nth-child(n + 4) { grid-column: span 1; }
  .ff-material-field:first-child { grid-column: span 2; }
  .ff-material-results { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ff-material-result--primary { grid-column: span 2; }
  .ff-material-actions { align-items: stretch; flex-direction: column; }
  .ff-material-actions p { order: 2; }
  .ff-material-clear { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  .ff-material-body,
  .ff-material-card,
  .ff-material-chevron,
  .ff-material-clear { animation: none; transition: none; }
}