: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: 1000px;
  margin: 0 auto;
}

section { margin-bottom: 22px; }

label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}

.input-section {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 20px;
}

.input-row {
  display: flex;
  gap: 10px;
  align-items: center;
}

input[type="text"] {
  flex: 1;
  padding: 10px 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: 15px;
}
input[type="text"]:focus { outline: none; border-color: var(--accent); }

button {
  padding: 10px 16px;
  background: var(--accent);
  color: #0b1320;
  border: none;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  font-family: inherit;
}
button:hover { filter: brightness(1.1); }

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

.error {
  margin: 10px 0 0;
  color: var(--error);
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
}

.meta {
  display: flex;
  gap: 24px;
  padding: 0 4px;
  flex-wrap: wrap;
}
.meta-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.meta-label {
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}
.meta-value {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 14px;
  color: var(--accent-2);
}

.output-rows {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 18px;
}

.output-row {
  display: grid;
  grid-template-columns: 200px 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--border);
}
.output-row:last-child { border-bottom: none; }

.output-label {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
}
.output-value {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 13px;
  color: var(--fg);
  word-break: break-all;
}

.copy-btn {
  padding: 4px 10px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 400;
}
.copy-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  filter: none;
}

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

@media (max-width: 700px) {
  .output-row { grid-template-columns: 1fr; gap: 6px; }
}