:root {
  color-scheme: dark;
  --bg: #0f1217;
  --panel: #191e27;
  --panel-2: #222936;
  --border: #354052;
  --text: #f5f7fb;
  --muted: #aab3c3;
  --accent: #36b9f5;
  --error: #ff8585;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, "Segoe UI", sans-serif;
}

button, input, select, textarea { font: inherit; }

button, input, select {
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel-2);
  color: var(--text);
}

button {
  padding: 0 14px;
  cursor: pointer;
  font-weight: 700;
}

button:hover { filter: brightness(1.08); }
button:active { transform: translateY(1px); }

input, select { padding: 0 13px; }
input { width: 100px; }

.app {
  width: min(1500px, 100%);
  margin: 0 auto;
}

.page-header h1 {
  margin: 0 0 8px;
  font-size: clamp(26px, 4vw, 34px);
}

.intro {
  margin: 0 0 18px;
  color: var(--muted);
  line-height: 1.5;
}

.toolbar,
.key-panel {
  margin-bottom: 16px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 15px;
  background: var(--panel);
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: end;
}

.toolbar label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
}

.key-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.key-panel-header > div {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
}

.detected-key {
  color: var(--muted);
  font-size: 13px;
}

.key-button {
      min-height: 42px;
      border: 2px solid var(--accent);
      border-radius: 0;
      background: #1e1f21;
      color: var(--text);
      cursor: pointer;
      font: inherit;
      font-size: 16px;
      width: 56px;
      margin-right: 3px;
    }

.key-button.active {
  background: var(--accent);
  color: #07151d;
}

.key-button.original::after {
  content: " •";
  font-size: 12px;
}

.grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 16px;
}

.card {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 15px;
  background: var(--panel);
}

.card-header {
  display: flex;
  min-height: 58px;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 16px;
  border-bottom: 1px solid var(--border);
}

.hint {
  color: var(--muted);
  font-size: 12px;
}

.output-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.output-actions button {
  height: 38px;
  padding-inline: 12px;
}

textarea {
  display: block;
  width: 100%;
  min-height: 560px;
  margin: 0;
  padding: 22px;
  overflow: auto;
  border: 0;
  border-radius: 0;
  outline: none;
  resize: vertical;
  line-height: 1.45;
  tab-size: 4;
  white-space: pre;
}

#source {
  background: #fff;
  color: #111;
}

#source::placeholder {
  color: #777;
  opacity: 1;
}

#output {
  background: #0a0d12;
  color: #f7f8fb;
}

.status-row {
  display: flex;
  min-height: 22px;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 11px;
}

.status {
  color: var(--muted);
  font-size: 13px;
}

.status.error {
  color: var(--error);
}

.repo-link {
  flex-shrink: 0;
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
}

.repo-link:hover {
  color: var(--text);
  text-decoration: underline;
}

@media (max-width: 900px) {
  .app { padding: 12px; }
  .grid { grid-template-columns: 1fr; }

  .card-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .output-actions { width: 100%; }
  .output-actions button { flex: 1; }
}

@media (max-width: 620px) {
  .key-grid {
    grid-template-columns: repeat(2, minmax(90px, 1fr));
  }

  .key-panel-header,
  .status-row {
    align-items: flex-start;
    flex-direction: column;
  }
}


.checkbox-label {
  display: flex !important;
  min-height: 44px;
  align-items: center;
  grid-template-columns: auto 1fr;
  gap: 9px !important;
  padding: 0 4px;
  color: var(--text) !important;
  cursor: pointer;
  font-size: 14px !important;
}

.checkbox-label input {
  width: 18px;
  height: 18px;
  margin: 0;
  accent-color: var(--accent);
}


.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 14px;
}

.chord {
  font-weight: 800;
}