/* ── Kinetic Energy Calculator ─────────────────────────────────── */

.ke-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  padding: 1rem 1.25rem;
  background: var(--surface-2, #f8fafc);
  border-radius: 10px;
  border: 1px solid var(--border, #e2e8f0);
}
[data-theme="dark"] .ke-controls { background: var(--surface-2, #1e293b); }

.ke-control-group { display: flex; flex-direction: column; gap: 0.4rem; }
.ke-control-label {
  font-size: 0.75rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--muted, #64748b);
}
.ke-radio-row { display: flex; flex-wrap: wrap; gap: 0.35rem 0.9rem; }
.ke-radio-label {
  display: flex; align-items: center; gap: 0.4rem;
  font-size: 0.9375rem; cursor: pointer;
}
.ke-radio-label input { accent-color: var(--accent, #2563eb); }

.ke-fields {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

.ke-field {
  border: 1.5px solid var(--border, #e2e8f0);
  border-radius: 10px;
  padding: 1rem;
  background: var(--bg, #fff);
  transition: border-color 0.18s;
  position: relative;
}
[data-theme="dark"] .ke-field { background: #0f172a; }
.ke-field--target {
  border-color: var(--accent, #2563eb);
  background: var(--accent-light, #eff6ff);
}
[data-theme="dark"] .ke-field--target { background: #172554; }

.ke-field-qty {
  font-size: 0.75rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--muted, #64748b);
  margin-bottom: 0.25rem;
}
.ke-field-name {
  font-size: 0.9375rem; font-weight: 600;
  margin-bottom: 0.75rem;
}
.ke-field-symbol {
  font-style: italic; color: var(--accent, #2563eb);
}

.ke-input-row { display: flex; gap: 0.5rem; }

.ke-input {
  flex: 1; min-width: 0;
  padding: 0.55rem 0.75rem;
  border: 1.5px solid var(--border, #e2e8f0);
  border-radius: 7px;
  font-size: 1rem;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  background: var(--bg, #fff);
  color: var(--text, #0f172a);
  transition: border-color 0.18s;
}
[data-theme="dark"] .ke-input { background: #1e293b; color: #f1f5f9; border-color: #334155; }
.ke-input:focus { outline: none; border-color: var(--accent, #2563eb); }
.ke-input--target {
  background: var(--accent-light, #eff6ff);
  border-color: var(--accent, #2563eb);
  color: var(--accent, #2563eb);
  font-weight: 700;
  cursor: default;
}
[data-theme="dark"] .ke-input--target { background: #172554; color: #93c5fd; }

.ke-unit {
  padding: 0.5rem 0.4rem;
  border: 1.5px solid var(--border, #e2e8f0);
  border-radius: 7px;
  font-size: 0.875rem;
  background: var(--bg, #fff);
  color: var(--text, #0f172a);
  cursor: pointer;
  min-width: 70px;
}
[data-theme="dark"] .ke-unit { background: #1e293b; color: #f1f5f9; border-color: #334155; }

.ke-actions { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; margin-bottom: 1rem; }

.ke-submit {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.625rem 1.5rem;
  background: var(--accent, #2563eb); color: #fff;
  border: none; border-radius: 8px;
  font-size: 1rem; font-weight: 600; cursor: pointer;
  transition: background 0.18s;
}
.ke-submit:hover { background: #1d4ed8; }

.ke-reset {
  padding: 0.625rem 1rem;
  background: transparent;
  color: var(--muted, #64748b);
  border: 1.5px solid var(--border, #e2e8f0);
  border-radius: 8px;
  font-size: 0.9375rem; cursor: pointer;
  transition: border-color 0.18s;
}
.ke-reset:hover { border-color: var(--accent, #2563eb); color: var(--accent, #2563eb); }

.ke-error {
  color: #dc2626; font-size: 0.9rem;
  padding: 0.5rem 0.75rem;
  background: #fef2f2; border-radius: 7px;
  border: 1px solid #fecaca;
}
[data-theme="dark"] .ke-error { background: #450a0a; border-color: #7f1d1d; color: #fca5a5; }

.ke-warning {
  background: #fefce8; border: 1px solid #ca8a04;
  border-radius: 8px; padding: 0.625rem 1rem;
  font-size: 0.875rem; color: #713f12;
  margin-top: 0.75rem;
}
[data-theme="dark"] .ke-warning { background: #1c1700; border-color: #713f12; color: #fde68a; }

.ke-result-block {
  background: var(--accent-light, #eff6ff);
  border: 2px solid var(--accent, #2563eb);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  margin-top: 1.25rem;
}
[data-theme="dark"] .ke-result-block { background: #172554; border-color: #3b82f6; }

.ke-result-value {
  font-size: 2rem; font-weight: 700;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  color: var(--accent, #2563eb);
  line-height: 1.2; word-break: break-all;
}
.ke-result-label {
  font-size: 0.9rem; color: var(--muted, #64748b); margin-top: 0.25rem;
}
.ke-result-extras {
  margin-top: 0.75rem; display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem;
  font-size: 0.875rem; color: var(--muted, #64748b);
}

.ke-formula-block {
  background: var(--surface-2, #f1f5f9);
  border-left: 3px solid var(--accent, #2563eb);
  border-radius: 0 8px 8px 0;
  padding: 0.875rem 1rem;
  margin-top: 1rem;
  font-size: 0.9rem;
  overflow-x: auto;
}
[data-theme="dark"] .ke-formula-block { background: #1e293b; }
.ke-formula-block code { font-family: 'JetBrains Mono', 'Fira Code', monospace; }
.ke-formula-block strong { color: var(--accent, #2563eb); }

.ke-comparison-table {
  width: 100%; border-collapse: collapse; margin-top: 0.75rem; font-size: 0.9rem;
}
.ke-comparison-table th {
  text-align: left; padding: 0.4rem 0.75rem;
  background: var(--surface-2, #f1f5f9);
  border: 1px solid var(--border, #e2e8f0);
  font-weight: 600;
}
.ke-comparison-table td {
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--border, #e2e8f0);
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}
[data-theme="dark"] .ke-comparison-table th { background: #1e293b; border-color: #334155; }
[data-theme="dark"] .ke-comparison-table td { border-color: #334155; }

@media (max-width: 480px) {
  .ke-fields { grid-template-columns: 1fr; }
  .ke-result-value { font-size: 1.5rem; }
}