:root {
  --bg: #0b0c0f;
  --fg: #e8e8ea;
  --muted: #9aa0a6;
  --accent: #4f8cff;
  --danger: #ff5c5c;
  --card: #151720;
  --input-bg: #0f1117;
  --border: #232630;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f8fb;
    --fg: #0a0b0e;
    --muted: #555c64;
    --accent: #2a67ff;
    --danger: #d63a3a;
    --card: #ffffff;
    --input-bg: #ffffff;
    --border: #e5e7eb;
  }
}

* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.5 system-ui, -apple-system, Segoe UI, Roboto, 'Helvetica Neue',
    Arial, 'Noto Sans', 'Apple Color Emoji', 'Segoe UI Emoji';
}

.app {
  max-width: 1000px;
  margin: 0 auto;
  padding: 16px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.title {
  font-size: 20px;
  margin: 0;
}
.controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.control-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

label {
  color: var(--muted);
  font-size: 12px;
}
select,
input[type='number'] {
  background: var(--input-bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 8px;
}

.btn {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 12px;
  cursor: pointer;
}
.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.btn.primary {
  background: var(--accent);
  border-color: transparent;
  color: white;
}
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.icon-btn {
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 18px;
  cursor: pointer;
}
.icon-btn:hover {
  color: var(--fg);
}

.main {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  flex: 1 1 auto;
  justify-content: center;
  margin-top: 0;
}
.kana-display {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
  min-height: 120px;
}
.kana {
  font-size: 92px;
  line-height: 1;
  padding: 8px 16px;
  border-radius: 14px;
  background: var(--card);
  border: 1px solid var(--border);
  min-width: 96px;
  text-align: center;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease,
    color 0.2s ease;
}
.kana.current {
  outline: 2px solid var(--accent);
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--accent) 30%, transparent);
}
.kana.done {
  opacity: 0.35;
}

.input-wrap {
  width: min(520px, 100%);
}
#typeInput {
  width: 100%;
  background: var(--input-bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 18px;
}
#typeInput.error {
  border-color: var(--danger);
  animation: shake 0.25s linear;
}

@keyframes shake {
  0% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-4px);
  }
  50% {
    transform: translateX(4px);
  }
  75% {
    transform: translateX(-2px);
  }
  100% {
    transform: translateX(0);
  }
}

.stats {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  justify-content: center;
}
.stat {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
  min-width: 95px;
  text-align: center;
}
.stat .label {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

/* Modals */
.modal {
  position: fixed;
  inset: 0;
  display: none;
}
.modal[aria-hidden='false'] {
  display: block;
}
.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
}
.modal-dialog {
  position: relative;
  margin: 6vh auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  max-width: 960px;
  width: min(960px, 92vw);
  padding: 12px;
  display: flex;
  flex-direction: column;
  max-height: 88vh;
}
.modal-header,
.modal-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 6px;
}
.modal-body {
  padding: 8px 6px;
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
}

.settings-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-bottom: 10px;
}
.groups-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}
.group {
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--bg);
}
.group-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  cursor: pointer;
}
.group-header:hover {
  background: var(--card);
}
.group-title {
  font-weight: 600;
}
.group-body {
  display: none;
  padding: 10px 12px;
  border-top: 1px solid var(--border);
}
.group[aria-expanded='true'] .group-body {
  display: block;
}

.chars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(56px, 1fr));
  gap: 8px;
  margin-top: 8px;
}
.char-item {
  display: flex;
  align-items: center;
  gap: 6px;
  justify-content: center;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 6px 4px;
}
.char-item label {
  font-size: 22px;
  line-height: 1;
}
.char-item input {
  transform: scale(1.1);
}

.results {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}
.result-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  text-align: center;
}
.result-item span {
  color: var(--muted);
  display: block;
  font-size: 12px;
}
.result-item strong {
  font-size: 22px;
}

.hidden {
  display: none;
}

@media (max-width: 640px) {
  .kana {
    font-size: 80px;
    min-width: 82px;
  }
}