/* ============================================================
   PROPORTION CALCULATOR — Styles
   ============================================================ */

.prop-wrap {
  display: flex;
  flex-direction: column;
  gap: 16px;
}


/* Presets */
.prop-presets {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
}

.prop-preset-label {
  font-size: .72rem;
  font-weight: 700;
  color: var(--subtext);
  text-transform: uppercase;
  letter-spacing: .04em;
  margin-right: 4px;
}

.prop-preset {
  padding: 5px 14px;
  border-radius: 6px;
  font-size: .78rem;
  font-weight: 700;
  cursor: pointer;
  transition: all .2s ease;
  background: var(--bg);
  color: var(--subtext);
  border: 1.5px solid var(--border);
  font-family: var(--system-fonts);
}

.prop-preset:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  transform: translateY(-1px);
}

.prop-preset:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}


/* Equation layout: a / b = c / d */
.prop-equation {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  padding: 18px 12px;
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
}

.prop-frac {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  min-width: 84px;
  flex: 0 1 auto;
}

.prop-frac-label {
  font-size: .7rem;
  font-weight: 800;
  color: var(--subtext);
  text-transform: uppercase;
  letter-spacing: .05em;
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: 5px;
  padding: 1px 9px;
}

.prop-input {
  width: 100%;
  padding: 10px 8px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1.15rem;
  font-weight: 700;
  text-align: center;
  color: var(--text);
  background: var(--card);
  transition: border-color .2s ease, box-shadow .2s ease;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  box-sizing: border-box;
}

.prop-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}

.prop-input::placeholder {
  color: var(--border);
  font-weight: 500;
}

/* Unknown placeholder box style */
.prop-input:placeholder-shown {
  border-style: dashed;
  border-color: var(--accent);
}

.prop-frac-den {
  font-size: .65rem;
  font-weight: 700;
  color: var(--subtext);
  opacity: .6;
  letter-spacing: .03em;
  min-height: 1em;
}

.prop-eq-op,
.prop-eq-sign {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--subtext);
  padding-bottom: 22px;
  user-select: none;
}

.prop-eq-sign {
  color: var(--primary);
  font-size: 1.7rem;
}

.prop-hint {
  font-size: .78rem;
  color: var(--subtext);
  text-align: center;
  margin: 0;
  line-height: 1.5;
}

.prop-hint strong {
  color: var(--primary);
}


/* Result Card */
.prop-result {
  margin-top: 8px;
  padding: 22px 20px;
  background: var(--bg);
  border-radius: var(--radius);
  border: 1.5px solid var(--border);
  text-align: center;
  transition: all .35s cubic-bezier(.4,0,.2,1);
  transform-origin: top center;
}

.prop-result.hidden { display: none; }

.prop-result.prop-result--visible {
  animation: pctSlideDown .35s cubic-bezier(.4,0,.2,1);
}

.prop-result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  gap: 8px;
  flex-wrap: wrap;
}

.prop-result-badge {
  font-size: .6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(37,99,235,.1);
  color: var(--primary);
  border: 1px solid rgba(37,99,235,.15);
}

.prop-result-label {
  font-size: .85rem;
  font-weight: 600;
  color: var(--subtext);
  flex: 1;
  text-align: left;
}

.prop-result-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

.prop-copy-btn {
  font-size: .68rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 6px;
  background: var(--card);
  color: var(--subtext);
  border: 1.5px solid var(--border);
  cursor: pointer;
  transition: all .2s ease;
  font-family: var(--system-fonts);
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 3px;
}

.prop-copy-btn:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.prop-copy-btn--copied {
  background: var(--success) !important;
  color: #fff !important;
  border-color: var(--success) !important;
}


/* Result hero */
.prop-result-hero {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.prop-answer-label {
  font-size: 1rem;
  font-weight: 700;
  color: var(--subtext);
}

.prop-answer-val {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.2;
  word-break: break-word;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
}


/* Simplified ratio */
.prop-simplified {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 12px;
  padding: 8px 14px;
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  flex-wrap: wrap;
}

.prop-simplified-label {
  font-size: .72rem;
  font-weight: 700;
  color: var(--subtext);
  text-transform: uppercase;
  letter-spacing: .04em;
}

.prop-simplified-val {
  font-size: .95rem;
  font-weight: 800;
  color: var(--accent);
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
}


/* Verification check */
.prop-check {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  text-align: left;
  background: var(--card);
  flex-wrap: wrap;
}

.prop-check-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  min-width: 34px;
  border-radius: 50%;
  font-size: 1rem;
  font-weight: 800;
  color: #fff;
}

.prop-check-badge--ok {
  background: var(--success);
}

.prop-check-badge--bad {
  background: var(--error);
}

.prop-check-text {
  font-size: .88rem;
  color: var(--text);
  line-height: 1.5;
}

.prop-check-text strong {
  color: var(--text);
}


/* Steps */
.prop-steps {
  padding: 14px 16px;
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  text-align: left;
}

.prop-steps-title {
  font-size: .72rem;
  font-weight: 700;
  color: var(--subtext);
  text-transform: uppercase;
  letter-spacing: .04em;
  margin-bottom: 10px;
}

.prop-step-line {
  display: block;
  font-size: .85rem;
  color: var(--subtext);
  line-height: 1.7;
  margin-bottom: 4px;
}

.prop-step-line strong { color: var(--text); }

.prop-step-num {
  display: inline-block;
  font-size: .65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .03em;
  padding: 1px 8px;
  border-radius: 4px;
  background: rgba(37,99,235,.1);
  color: var(--primary);
  margin-right: 6px;
  vertical-align: middle;
}

.prop-step-formula {
  padding-left: 8px;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  font-size: .82rem;
  word-break: break-all;
}

.prop-step-answer {
  color: var(--text);
}

.prop-step-answer strong {
  color: var(--primary);
}


/* Error */
.prop-result-error {
  display: none;
  margin-top: 10px;
  padding: 10px 14px;
  background: rgba(239,68,68,.08);
  border: 1px solid rgba(239,68,68,.2);
  border-radius: var(--radius-sm);
  font-size: .85rem;
  color: var(--error);
  text-align: left;
}

.prop-result-error--visible {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.prop-result-error::before {
  content: '!';
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  min-width: 20px;
  background: var(--error);
  color: #fff;
  border-radius: 50%;
  font-size: .75rem;
  font-weight: 800;
}


/* Dark mode */
[data-theme="dark"] .prop-result { background: var(--card); }

[data-theme="dark"] .prop-equation { background: var(--card); }

[data-theme="dark"] .prop-input,
[data-theme="dark"] .prop-simplified,
[data-theme="dark"] .prop-check,
[data-theme="dark"] .prop-steps { background: var(--bg); }

[data-theme="dark"] .prop-preset { background: var(--card); }

[data-theme="dark"] .prop-copy-btn { background: var(--bg); }


/* Mobile */
@media (max-width: 600px) {
  .prop-result { padding: 16px 14px; }
  .prop-answer-val { font-size: 1.6rem; }
  .prop-equation { gap: 8px; padding: 14px 8px; }
  .prop-frac { min-width: 70px; }
  .prop-input { font-size: 1rem; padding: 8px 6px; }
  .prop-eq-op, .prop-eq-sign { padding-bottom: 20px; font-size: 1.2rem; }
  .prop-eq-sign { font-size: 1.4rem; }
  .prop-result-header { flex-direction: column; align-items: flex-start; }
  .prop-result-actions { align-self: stretch; }
  .prop-copy-btn { flex: 1; justify-content: center; }
  .prop-result-label { width: 100%; }
  .prop-steps { padding: 10px 12px; }
  .prop-step-formula { font-size: .75rem; }
  .prop-preset-label { display: none; }
}