:root {
  color-scheme: light dark;
  --bg: #f3f4f6;
  --panel: rgba(255, 255, 255, 0.9);
  --text: #111827;
  --muted: #6b7280;
  --primary: #ef4444;
  --primary-dark: #b91c1c;
  --border: rgba(17, 24, 39, 0.08);
  --shadow: 0 18px 40px rgba(17, 24, 39, 0.12);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #030712;
    --panel: rgba(17, 24, 39, 0.92);
    --text: #f9fafb;
    --muted: #9ca3af;
    --border: rgba(255, 255, 255, 0.08);
    --shadow: 0 18px 40px rgba(0, 0, 0, 0.3);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #1f2937, var(--bg) 40%);
  color: var(--text);
}

button {
  font: inherit;
}

.app-shell {
  width: min(100%, 720px);
  margin: 0 auto;
  padding: max(20px, env(safe-area-inset-top)) 16px max(24px, env(safe-area-inset-bottom));
}

.app-header,
.history-header,
.status-panel,
.actions-grid {
  display: flex;
  align-items: center;
}

.app-header,
.history-header {
  justify-content: space-between;
  gap: 12px;
}

.eyebrow,
.label,
.mic-hint {
  color: var(--muted);
}

.eyebrow,
.label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.78rem;
  margin: 0 0 6px;
}

h1,
h2,
.status-message,
.output-text,
.mic-hint {
  margin: 0;
}

h1 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
}

h2 {
  font-size: 1rem;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 18px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.status-panel {
  justify-content: space-between;
  gap: 16px;
  margin-top: 18px;
}

.status-message {
  max-width: 220px;
  text-align: right;
  color: var(--muted);
  font-size: 0.95rem;
}

.mic-section {
  display: grid;
  place-items: center;
  padding: 24px 0;
}

.mic-button {
  width: 148px;
  height: 148px;
  border: none;
  border-radius: 999px;
  background: linear-gradient(180deg, #fb7185, var(--primary));
  color: white;
  box-shadow: 0 18px 36px rgba(239, 68, 68, 0.35);
  font-size: 3rem;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.mic-button.listening {
  animation: pulse 1.1s infinite;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

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

.output-block {
  display: grid;
  gap: 6px;
}

.output-text {
  line-height: 1.5;
  font-size: 1.05rem;
}

.output-text.japanese {
  font-size: clamp(1.5rem, 5vw, 2.4rem);
  font-weight: 700;
}

.output-text.romaji {
  font-size: 1rem;
}

.muted {
  color: var(--muted);
}

.actions-grid {
  gap: 12px;
  margin: 16px 0;
}

.action-button,
.ghost-button {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
}

.action-button {
  flex: 1;
  padding: 14px;
  border-radius: 18px;
}

.action-button.danger {
  color: var(--primary-dark);
}

.ghost-button {
  padding: 10px 14px;
  border-radius: 14px;
}

.ghost-button.small {
  padding: 8px 10px;
  font-size: 0.9rem;
}

.history-panel {
  display: grid;
  gap: 14px;
}

.history-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}

.history-item {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.06);
}

.history-item button {
  width: 100%;
  background: transparent;
  border: none;
  color: inherit;
  text-align: left;
  padding: 0;
}

.history-source,
.history-target {
  display: block;
}

.history-target {
  margin-top: 4px;
  font-weight: 700;
}

@media (max-width: 560px) {
  .status-panel,
  .actions-grid {
    flex-direction: column;
    align-items: stretch;
  }

  .status-message {
    max-width: none;
    text-align: left;
  }
}