.card h1 { margin-bottom: 4px; }

.cal-intro {
  margin: 0 0 20px;
  font-size: 13px;
  color: var(--text-muted);
}

.cal-mode-toggle {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 4px;
  border-radius: 10px;
  background: var(--key-bg);
  margin-bottom: 20px;
  width: fit-content;
}

.cal-mode-btn {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-muted);
  background: transparent;
  border: none;
  border-radius: 7px;
  padding: 8px 16px;
  cursor: pointer;
}
.cal-mode-btn:hover { color: var(--text-primary); }
.cal-mode-btn.active {
  color: var(--accent-primary);
  background: var(--panel);
  box-shadow: 0 1px 4px rgba(31, 35, 51, 0.12);
}

/* [hidden] and .gc-results { display: flex } are equal CSS specificity,
   and this file loads after the UA stylesheet - without this override the
   hidden PROPERTY set in JS has no visual effect (a real bug that shipped
   once already, in the geometry calculator). */
.cal-panel[hidden],
.gc-results[hidden] { display: none; }

.cal-panel-hint {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-muted);
}

.cal-form {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
  gap: 12px;
  margin-bottom: 14px;
}

.cal-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 12px;
  color: var(--text-muted);
}

.cal-field input, .cal-field select {
  font-family: var(--sans);
  font-size: 14px;
  color: var(--text-primary);
  padding: 9px 10px;
  border-radius: 8px;
  border: 1px solid var(--panel-border);
  background: var(--panel);
}
.cal-field input:focus, .cal-field select:focus {
  outline: 2px solid var(--accent-primary);
  outline-offset: 1px;
}

.cal-degree-field { max-width: 220px; margin-bottom: 14px; }

.cal-degree-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.cal-diagram {
  width: 100%;
  max-width: 300px;
  height: auto;
  display: block;
  margin: 0 auto;
}

.cal-axis { stroke: var(--panel-border); stroke-width: 1.5; }
.cal-curve { fill: none; stroke: var(--accent-primary); stroke-width: 2.5; stroke-linejoin: round; }
.cal-tangent { stroke: var(--accent-rose); stroke-width: 2; stroke-dasharray: 5 4; }
.cal-area { fill: var(--accent-primary-dim); stroke: none; }
.cal-point { fill: var(--accent-rose); }

.cal-point-wrap { cursor: default; }
.cal-hit-area { fill: transparent; }
.cal-tooltip {
  opacity: 0;
  transition: opacity 0.12s ease;
  pointer-events: none;
}
.cal-point-wrap:hover .cal-tooltip { opacity: 1; }
.cal-tooltip-bg { fill: var(--text-primary); }
.cal-tooltip-text {
  font-family: var(--mono);
  font-size: 10px;
  fill: #ffffff;
}

.gc-results {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--panel-border);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.gc-error {
  margin: 0;
  font-size: 13px;
  color: var(--accent-error);
}

.gc-output {
  border: 1px solid var(--panel-border);
  border-left: 3px solid var(--accent-primary);
  border-radius: 12px;
  padding: 12px 16px;
}

.gc-output-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 6px;
}
.gc-output-top span { font-size: 13px; color: var(--text-muted); }
.gc-output-top strong { font-family: var(--mono); font-size: 20px; color: var(--text-primary); }

.gc-output-formula {
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-muted);
  word-break: break-word;
}

.gc-info-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.gc-info-list li {
  padding: 14px 16px;
  border-left: 3px solid var(--accent-primary);
  background: var(--key-bg);
  border-radius: 0 12px 12px 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.gc-info-list strong { font-size: 13px; color: var(--text-primary); }
.gc-info-list span { font-size: 13px; line-height: 1.55; color: var(--text-muted); }