body {
  margin: 0;
  min-height: 100vh;
}

.container {
  width: min(1180px, 94%);
  margin: 0 auto;
}

.ad-wrap {
  text-align: center;
  padding: 8px 0 10px;
}

.hero {
  padding: 1.8rem 0 0.8rem;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.5rem, 2.8vw, 2.2rem);
}

.hero p {
  margin-top: 0.5rem;
  color: var(--text-secondary);
}

.card {
  border: 1px solid var(--border-color);
  background: var(--card-bg);
  border-radius: 16px;
  padding: 1rem;
  margin-bottom: 1rem;
}

.inputs-card {
  display: grid;
  gap: 0.9rem;
}

.input-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(260px, 1fr));
  gap: 0.8rem;
}

.label {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

textarea {
  width: 100%;
  min-height: 220px;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 0.7rem;
  background: #0f172a;
  color: var(--text-primary);
  font-family: "JetBrains Mono", monospace;
  resize: vertical;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.btn {
  border: 1px solid transparent;
  border-radius: 10px;
  cursor: pointer;
  padding: 0.58rem 0.88rem;
  font-weight: 600;
}

.btn-primary {
  background: #2563eb;
  color: #fff;
}

.btn-secondary {
  background: #1e293b;
  color: #fff;
}

.btn-ghost {
  background: transparent;
  border-color: var(--border-color);
  color: var(--text-primary);
}

.summary {
  margin: 0;
  color: var(--text-secondary);
}

.result-head h2 {
  margin: 0 0 0.65rem;
  font-size: 1rem;
}

.result-grid {
  display: grid;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
}

.diff-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--border-color);
}

.diff-row:first-child {
  border-top: 0;
}

.diff-cell {
  display: grid;
  grid-template-columns: 56px 1fr;
  border-left: 1px solid var(--border-color);
  background: rgba(15, 23, 42, 0.6);
}

.diff-cell:first-child {
  border-left: 0;
}

.line-no {
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
  padding: 0.46rem 0.45rem;
  color: #94a3b8;
  font-size: 0.78rem;
  border-right: 1px solid var(--border-color);
  font-family: "JetBrains Mono", monospace;
}

.line-text {
  margin: 0;
  padding: 0.46rem 0.65rem;
  font-size: 0.84rem;
  line-height: 1.45;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font-family: "JetBrains Mono", monospace;
}

.diff-row.same .diff-cell {
  background: rgba(15, 23, 42, 0.42);
}

.diff-row.changed .diff-cell {
  background: rgba(245, 158, 11, 0.09);
}

.diff-row.added .diff-cell.right-cell {
  background: rgba(34, 197, 94, 0.17);
}

.diff-row.removed .diff-cell.left-cell {
  background: rgba(239, 68, 68, 0.16);
}

.line-text .char-diff {
  background: rgba(251, 191, 36, 0.3);
  border-radius: 3px;
  padding: 0 1px;
}

.placeholder {
  color: #64748b;
  font-style: italic;
}

@media (max-width: 860px) {
  .input-grid {
    grid-template-columns: 1fr;
  }

  .diff-row {
    grid-template-columns: 1fr;
  }

  .diff-cell {
    border-left: 0;
    border-top: 1px solid var(--border-color);
  }

  .diff-cell:first-child {
    border-top: 0;
  }
}