:root {
  --text: #1a1a1a;
  --muted: #555;
  --border: #e5e5e5;
  --bg: #ffffff;
  --accent: #1f2937;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Serif JP", serif;
  line-height: 1.85;
  letter-spacing: 0.03em;
}

a {
  color: inherit;
}

a:hover {
  color: var(--accent);
}

.nw-header {
  padding: 32px 20px 12px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.nw-title {
  margin: 12px 0 8px;
  font-size: 1.8rem;
  font-weight: 600;
}

.nw-subtitle {
  margin: 0 auto 12px;
  max-width: 760px;
  color: var(--muted);
  font-size: 1rem;
}

.nw-count {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.nw-main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 20px;
}

.nw-lang-switch {
  display: flex;
  justify-content: center;
  gap: 8px;
}

.nw-lang-btn {
  padding: 6px 14px;
  border: 1px solid var(--border);
  background: #f8f8f8;
  cursor: pointer;
  border-radius: 999px;
  font-family: inherit;
  letter-spacing: 0.03em;
}

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

.ad-slot {
  margin: 12px 0 24px;
  padding: 14px;
  border: 1px dashed var(--border);
  text-align: center;
  color: var(--muted);
  font-size: 0.95rem;
}

.search-panel,
.group-wrapper {
  margin: 24px 0;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fafafa;
}

.section-title {
  margin: 0 0 8px;
  font-size: 1.2rem;
}

.section-desc {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 0.95rem;
}

.search-input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 1rem;
  font-family: inherit;
  background: #fff;
}

.group-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.group-section {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  background: #fff;
}

.group-heading {
  margin: 0 0 12px;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.group-heading .badge {
  display: inline-block;
  padding: 2px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--muted);
}

.kanji-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

@media (min-width: 640px) {
  .kanji-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .kanji-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.kanji-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  background: #fff;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.kanji-pair {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.kanji-old {
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.kanji-new {
  font-size: 1.25rem;
  color: var(--muted);
}

.kanji-meaning {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.copy-btn {
  align-self: flex-start;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #f6f6f6;
  cursor: pointer;
  font-family: inherit;
}

.copy-btn:hover {
  border-color: var(--accent);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  background: var(--accent);
  color: #fff;
  padding: 10px 14px;
  border-radius: 10px;
  opacity: 0;
  transition: opacity 0.2s ease, transform 0.2s ease;
  pointer-events: none;
  font-size: 0.95rem;
}

.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

.status-message {
  color: var(--muted);
  margin: 8px 0;
}

.empty-message {
  margin: 12px 0 0;
  color: var(--muted);
  text-align: center;
}

.nw-donate {
  margin: 28px 0 12px;
  text-align: center;
  color: var(--muted);
}

.nw-donate-links {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 8px;
}

.nw-donate a,
.nw-links a {
  text-decoration: none;
  font-weight: 600;
}

.nw-links {
  text-align: center;
  margin-bottom: 28px;
}

.nw-footer {
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 18px 12px 28px;
  color: var(--muted);
  font-size: 0.95rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}