/* Roman Numerals Converter — styles */
.page { max-width: 720px; margin: 32px auto; padding: 0 20px; }
.page h1 { font-size: 36px; color: #fff; margin-bottom: 8px; letter-spacing: -0.5px; }
.page .subtitle { color: #888; font-size: 15px; margin-bottom: 28px; line-height: 1.5; }

.roman-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.field label {
  display: block; font-size: 12px; color: #aaa; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 8px;
}
.field input {
  width: 100%; padding: 14px 16px;
  background: #141414; border: 1px solid #262626;
  color: #e1e1e1; font-size: 18px;
  border-radius: 10px; font-family: inherit;
  outline: none; transition: border-color 0.15s;
}
.field input:focus { border-color: #ff4444; }
.field input.invalid { border-color: #ff4444; }

.err {
  min-height: 18px;
  font-size: 12px; color: #ff7070; margin-top: 6px;
}

.result-box {
  margin-top: 24px; padding: 22px 24px;
  background: #141414; border: 1px solid #ff4444;
  border-radius: 12px;
  display: flex; flex-direction: column; gap: 6px;
  position: relative;
}
.result-label {
  font-size: 11px; color: #888; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.5px;
}
.result-value {
  font-size: 32px; color: #fff; font-weight: 700;
  letter-spacing: 0.5px;
  word-break: break-all;
  font-family: 'SF Mono', Monaco, monospace;
}
.copy-btn {
  position: absolute; top: 18px; right: 18px;
  padding: 6px 14px; background: #1f1f1f; border: 1px solid #333;
  color: #ccc; font-size: 13px; font-weight: 500;
  border-radius: 6px; cursor: pointer; transition: all 0.15s;
  font-family: inherit;
}
.copy-btn:hover { background: #2a2a2a; border-color: #444; color: #fff; }
.copy-btn.copied { border-color: #4ade80; color: #4ade80; }

.ref-card {
  margin-top: 36px; padding: 22px 24px;
  background: #0f0f0f; border: 1px solid #1f1f1f;
  border-radius: 12px;
}
.ref-card h2 {
  font-size: 13px; color: #aaa; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.5px;
  margin-bottom: 14px;
}
.ref-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}
.ref-grid > div {
  display: flex; align-items: baseline; justify-content: space-between;
  padding: 10px 14px;
  background: #141414; border: 1px solid #262626;
  border-radius: 8px;
  gap: 10px;
}
.ref-sym {
  font-family: 'SF Mono', Monaco, monospace;
  font-size: 16px; color: #ff4444; font-weight: 700;
  letter-spacing: 1px;
}
.ref-val {
  font-size: 13px; color: #aaa;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 600px) {
  .page h1 { font-size: 28px; }
  .roman-grid { grid-template-columns: 1fr; }
  .ref-grid { grid-template-columns: repeat(3, 1fr); }
  .result-value { font-size: 24px; }
  .copy-btn { position: static; margin-top: 10px; align-self: flex-start; }
  .result-box { flex-direction: column; align-items: stretch; }
}