:root {
  --bg: #0f1115;
  --panel: #171a21;
  --panel-2: #1e222b;
  --fg: #e6e8ec;
  --muted: #8a93a6;
  --accent: #7cc4ff;
  --accent-2: #9ae6b4;
  --border: #272b35;
  --error: #ff6b6b;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  font-size: 15px;
  line-height: 1.6;
}

header {
  padding: 24px 32px 8px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--border);
}
header h1 { margin: 0; font-size: 22px; }
header #subtitle {
  grid-column: 1 / 2;
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 14px;
}
.lang-switch {
  grid-column: 2 / 3;
  grid-row: 1 / 3;
  display: flex;
  align-items: center;
  gap: 6px;
}

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

.input-section {
  margin-bottom: 28px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 20px;
}
.input-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  flex-wrap: wrap;
  gap: 12px;
}

label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 0;
}

.mode-switch {
  display: flex;
  align-items: center;
  gap: 14px;
}
.mode-switch > span {
  color: var(--muted);
  font-size: 13px;
}
.mode-switch label {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  color: var(--fg);
  font-size: 13px;
}
.mode-switch input[type="radio"] {
  accent-color: var(--accent);
}

textarea {
  width: 100%;
  padding: 12px 14px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--fg);
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 14px;
  line-height: 1.5;
  resize: vertical;
}
textarea:focus { outline: none; border-color: var(--accent); }

select {
  padding: 8px 10px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--fg);
  font-size: 13px;
}

.cards {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}
@media (min-width: 900px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: var(--panel-2);
  border-bottom: 1px solid var(--border);
}
.card h2 {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}
.copy-btn {
  padding: 4px 10px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--muted);
  font-size: 11px;
  cursor: pointer;
  font-family: inherit;
}
.copy-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.card-output {
  margin: 0;
  padding: 14px 16px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
  line-height: 1.5;
  color: var(--accent-2);
  white-space: pre-wrap;
  word-break: break-all;
  min-height: 60px;
  max-height: 260px;
  overflow-y: auto;
}
.card-output.error {
  color: var(--error);
}

footer {
  padding: 24px 32px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}