:root {
  /* ユズコ専用ダーク DESIGN.md 準拠 */
  --bg: #111111;
  --panel: #1a1a1a;
  --text: #eeeeee;
  --muted: #b5b5b5;
  --accent: #0ea5e9;
  --border: #2a2a2a;
  --danger: #e02020;
  --success: #2a2a2a;

  /* Typography */
  --font-main: "Segoe UI", "Yu Gothic UI", "Hiragino Kaku Gothic ProN", sans-serif;
  --line-height: 1.7;
  --letter-spacing: 0.04em;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-main);
  line-height: var(--line-height);
  letter-spacing: var(--letter-spacing);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 16px;
}

.container {
  width: 100%;
  max-width: 600px;
  background-color: var(--panel);
  padding: 24px;
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.3);
  position: relative; /* 言語スイッチャーの基準用 */
}

.lang-switcher {
  position: absolute;
  top: 12px;
  right: 12px;
  display: flex;
  gap: 4px;
}

.btn-lang {
  padding: 4px 8px;
  font-size: 11px;
  background-color: var(--bg);
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  flex: none; /* 幅が勝手に伸びないように */
}

.btn-lang.active {
  background-color: var(--accent);
  color: white;
  border-color: var(--accent);
}

.btn-lang:hover:not(.active) {
  border-color: var(--accent);
}

h1 {
  font-size: 24px;
  margin-bottom: 24px;
  text-align: center;
  color: var(--accent);
}

.input-group {
  margin-bottom: 20px;
}

label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 14px;
}

input[type="text"] {
  width: 100%;
  padding: 12px;
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-size: 16px;
  outline: none;
  transition: border-color 0.2s;
}

input[type="text"]:focus {
  border-color: var(--accent);
}

.hint {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-top: 4px;
}

.button-group {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}

button {
  flex: 1;
  padding: 12px;
  border: none;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.1s;
}

button:active {
  transform: scale(0.98);
}

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

.btn-secondary {
  background-color: var(--panel);
  color: var(--accent);
  border: 1px solid var(--accent);
  width: 100%;
}

.btn-secondary:hover {
  background-color: rgba(14, 165, 233, 0.1);
}

.btn-danger {
  background-color: var(--danger);
  color: white;
}

.btn-success {
  background-color: var(--success);
  color: white;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.progress-container {
  margin-bottom: 20px;
  display: none;
}

.progress-bar {
  width: 100%;
  height: 8px;
  background-color: var(--bg);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  width: 0%;
  height: 100%;
  background-color: var(--accent);
  transition: width 0.1s;
}

.results-container {
  margin-top: 24px;
  display: none;
}

.results-list {
  background-color: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  height: 250px;
  overflow-y: auto;
  padding: 12px;
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 14px;
  white-space: pre-wrap;
  color: var(--text);
}

.download-options {
  margin-top: 16px;
  display: flex;
  gap: 12px;
}

.download-options button {
  font-size: 14px;
}

#status-text {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 8px;
  display: block;
}