:root {
  color-scheme: light;
  --bg: #f7f7f9;
  --card: #ffffff;
  --border: #e4e4e8;
  --text: #171717;
  --muted: #5f5f6b;
  --accent: #2b6df6;
  --shadow: 0 10px 30px rgba(15, 15, 25, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px 48px;
}

.header {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.header h1 {
  margin: 0 0 8px;
  font-size: 2.4rem;
}

.header p {
  margin: 0;
  color: var(--muted);
}

.stats {
  display: flex;
  gap: 16px;
  font-size: 0.95rem;
  color: var(--muted);
}

.main {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(320px, 1fr);
  gap: 24px;
}

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  box-shadow: var(--shadow);
}

.input-panel label {
  font-weight: 600;
  display: block;
  margin-bottom: 8px;
}

textarea {
  width: 100%;
  min-height: 420px;
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 14px;
  font-size: 1rem;
  line-height: 1.5;
  resize: vertical;
}

textarea:focus {
  outline: 2px solid rgba(43, 109, 246, 0.25);
  border-color: var(--accent);
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

button {
  border: none;
  padding: 10px 16px;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

button:focus-visible {
  outline: 3px solid rgba(43, 109, 246, 0.4);
  outline-offset: 2px;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 14px rgba(43, 109, 246, 0.15);
}

.primary {
  background: var(--accent);
  color: white;
}

.secondary {
  background: #eef0f6;
  color: #2b2b33;
}

.ghost {
  background: transparent;
  border: 1px dashed var(--border);
  color: var(--muted);
}

.note {
  margin-top: 16px;
  color: var(--muted);
  font-size: 0.9rem;
}

.note span {
  display: block;
  font-weight: 600;
  color: #9c3030;
  margin-bottom: 6px;
}

.output-panel {
  display: grid;
  gap: 16px;
}

.card {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  background: #fff;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.card h2 {
  margin: 0;
  font-size: 1.2rem;
}

.label {
  color: var(--muted);
  margin: 6px 0 12px;
  font-size: 0.9rem;
}

.output ul {
  margin: 0;
  padding-left: 20px;
}

.output li {
  margin-bottom: 8px;
  line-height: 1.4;
}

.empty {
  color: var(--muted);
  margin: 0;
}

.copy {
  background: #f3f4f7;
  color: #333;
  font-size: 0.85rem;
  padding: 6px 12px;
}

.copy-all {
  background: #fbfbfd;
}

.error {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: 12px;
  background: #ffecec;
  color: #9c3030;
  border: 1px solid #ffc2c2;
}

@media (max-width: 980px) {
  .main {
    grid-template-columns: 1fr;
  }

  textarea {
    min-height: 320px;
  }
}