/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

:root {
  --bg: #000;
  --bg-elev: #0a0a0a;
  --bg-elev-2: #141414;
  --fg: #fff;
  --fg-dim: rgba(255,255,255,0.55);
  --fg-dimmer: rgba(255,255,255,0.35);
  --border: rgba(255,255,255,0.08);
  --border-strong: rgba(255,255,255,0.18);
  --accent: #fff;
  --tap: 44px;
}

[data-theme="light"] {
  --bg: #fafafa;
  --bg-elev: #fff;
  --bg-elev-2: #f0f0f0;
  --fg: #0a0a0a;
  --fg-dim: rgba(0,0,0,0.6);
  --fg-dimmer: rgba(0,0,0,0.35);
  --border: rgba(0,0,0,0.08);
  --border-strong: rgba(0,0,0,0.18);
  --accent: #0a0a0a;
}

html { -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'Inter', 'Noto Sans TC', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 400;
  line-height: 1.5;
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  padding-top: calc(168px + env(safe-area-inset-top, 0px));
  padding-bottom: env(safe-area-inset-bottom, 0px);
  transition: background 0.3s, color 0.3s;
}

body.detail-open {
  overflow: hidden;
  padding-top: 0;
}

button {
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  font: inherit;
}

a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

/* ===== Header ===== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  padding-top: env(safe-area-inset-top, 0px);
  transition: transform 0.3s ease;
}

body.detail-open .site-header { transform: translateY(-100%); pointer-events: none; }
body.detail-open .site-header.detail-active { transform: translateY(0); pointer-events: auto; }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 52px;
  padding: 0 16px;
}

.back-btn {
  width: var(--tap); height: var(--tap);
  display: none;
  align-items: center; justify-content: center;
  font-size: 22px;
  color: var(--fg);
  margin-left: -10px;
}
body.detail-open .back-btn { display: flex; }

.logo {
  font-family: 'Inter', sans-serif;
  font-weight: 900;
  font-size: 18px;
  letter-spacing: 0.12em;
  flex: 1;
  text-align: center;
}
body.detail-open .logo { text-align: left; padding-left: 4px; }

.logo-sub {
  display: inline-block;
  margin-left: 8px;
  font-family: 'Noto Sans TC', sans-serif;
  font-weight: 300;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--fg-dim);
}

.theme-btn {
  width: var(--tap); height: var(--tap);
  display: flex;
  align-items: center; justify-content: center;
  font-size: 20px;
  color: var(--fg-dim);
  margin-right: -10px;
}

.search-bar {
  padding: 0 16px 10px;
  position: relative;
}
body.detail-open .search-bar { display: none; }

#searchInput {
  width: 100%;
  height: 44px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 22px;
  color: var(--fg);
  padding: 0 44px 0 18px;
  font-size: 15px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
}
#searchInput:focus { border-color: var(--border-strong); }
#searchInput::placeholder { color: var(--fg-dimmer); font-size: 14px; }
#searchInput::-webkit-search-cancel-button { display: none; }

.clear-btn {
  position: absolute;
  right: 24px; top: 50%;
  transform: translateY(-50%);
  width: 30px; height: 30px;
  display: flex;
  align-items: center; justify-content: center;
  background: var(--bg-elev-2);
  color: var(--fg-dim);
  font-size: 12px;
  border-radius: 50%;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s;
}
.clear-btn.visible { opacity: 1; pointer-events: auto; }

.filter-tabs {
  display: flex;
  gap: 8px;
  padding: 0 16px 12px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.filter-tabs::-webkit-scrollbar { display: none; }
body.detail-open .filter-tabs { display: none; }

.tab {
  flex-shrink: 0;
  height: 32px;
  padding: 0 14px;
  border-radius: 16px;
  background: transparent;
  border: 1px solid var(--border-strong);
  color: var(--fg-dim);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: all 0.15s;
}
.tab.active {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}

/* ===== List ===== */
.list-view {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 16px 60px;
}

.result-info {
  padding: 12px 4px;
  font-size: 12px;
  color: var(--fg-dimmer);
  letter-spacing: 0.05em;
}

/* Disc divider for replica */
.disc-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 4px 8px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--fg-dimmer);
  text-transform: uppercase;
}
.disc-divider::before,
.disc-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

.song-list {
  display: flex;
  flex-direction: column;
}

.song-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 4px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: opacity 0.15s;
  position: relative;
}
.song-card:active { opacity: 0.5; }

.song-card.instrumental {
  opacity: 0.55;
}
.song-card.instrumental .song-card-title {
  font-style: italic;
  font-weight: 500;
}

.song-card-num {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  color: var(--fg-dimmer);
  width: 28px;
  flex-shrink: 0;
  letter-spacing: 0.05em;
}

.song-card-text {
  flex: 1;
  min-width: 0;
}

.song-card-title {
  font-family: 'Noto Sans JP', 'Noto Sans TC', sans-serif;
  font-weight: 700;
  font-size: 17px;
  line-height: 1.3;
  margin-bottom: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.song-card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--fg-dim);
  font-family: 'Inter', sans-serif;
  font-weight: 400;
  letter-spacing: 0.02em;
}

.song-card-meta .romaji { font-style: italic; }
.song-card-meta .dot {
  width: 3px; height: 3px;
  background: var(--fg-dimmer);
  border-radius: 50%;
  flex-shrink: 0;
}
.song-card-meta .tag {
  display: inline-block;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--bg-elev-2);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-dim);
}

.song-card-fav {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
  color: var(--fg-dimmer);
  flex-shrink: 0;
  border-radius: 50%;
}
.song-card-fav.active { color: #ffd84d; }

/* highlight match */
mark {
  background: rgba(255, 216, 77, 0.25);
  color: var(--fg);
  padding: 0 2px;
  border-radius: 2px;
}
[data-theme="light"] mark { background: rgba(255, 216, 77, 0.6); }

/* ===== Empty ===== */
.empty-state {
  padding: 80px 16px;
  text-align: center;
  color: var(--fg-dimmer);
}

/* ===== Detail ===== */
.detail-view {
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 50;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding-top: calc(52px + env(safe-area-inset-top, 0px));
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

.detail-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 20px 80px;
}

.detail-album-tag {
  display: inline-block;
  padding: 4px 10px;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  font-size: 11px;
  color: var(--fg-dim);
  letter-spacing: 0.08em;
  margin-bottom: 16px;
  font-family: 'Inter', sans-serif;
}

.detail-title-ja {
  font-family: 'Noto Sans JP', 'Noto Sans TC', sans-serif;
  font-weight: 900;
  font-size: 32px;
  line-height: 1.15;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
  word-break: break-word;
}

.detail-title-romaji {
  font-family: 'Inter', sans-serif;
  font-weight: 400;
  font-style: italic;
  font-size: 17px;
  color: var(--fg-dim);
  margin-bottom: 4px;
}

.detail-title-zh {
  font-family: 'Noto Sans TC', sans-serif;
  font-weight: 500;
  font-size: 14px;
  color: var(--fg-dimmer);
  margin-bottom: 20px;
}

.detail-fav-btn {
  display: inline-flex;
  align-items: center; gap: 6px;
  margin-bottom: 24px;
  padding: 8px 14px;
  border: 1px solid var(--border-strong);
  border-radius: 16px;
  font-size: 13px;
  color: var(--fg-dim);
  transition: all 0.15s;
}
.detail-fav-btn.active {
  background: #ffd84d;
  border-color: #ffd84d;
  color: #000;
}

.detail-section {
  margin-bottom: 32px;
}

.detail-section-label {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--fg-dimmer);
  text-transform: uppercase;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.detail-meaning {
  font-family: 'Noto Sans TC', sans-serif;
  font-size: 15px;
  line-height: 1.85;
  color: var(--fg);
}

/* Interlude notice */
.instrumental-notice {
  padding: 18px 20px;
  background: var(--bg-elev);
  border-radius: 12px;
  color: var(--fg-dim);
  font-size: 14px;
  line-height: 1.7;
}

/* Primary links — 歌詞 + Spotify big CTAs */
.detail-primary-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.detail-primary-link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 18px;
  border-radius: 14px;
  font-family: 'Noto Sans TC', 'Inter', sans-serif;
  transition: transform 0.15s, opacity 0.15s;
  position: relative;
  min-height: 68px;
}
.detail-primary-link:active { transform: scale(0.98); opacity: 0.85; }

.detail-primary-link .primary-icon {
  width: 40px; height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  border-radius: 50%;
  flex-shrink: 0;
}

.detail-primary-link .primary-label {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}
.detail-primary-link .primary-label strong {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.detail-primary-link .primary-label small {
  font-size: 11px;
  opacity: 0.7;
  letter-spacing: 0.05em;
}

.detail-primary-link .primary-arrow {
  font-size: 18px;
  opacity: 0.5;
  flex-shrink: 0;
}

/* Lyrics link */
.lyrics-link {
  background: var(--fg);
  color: var(--bg);
}
.lyrics-link .primary-icon {
  background: var(--bg);
  color: var(--fg);
  font-family: 'Noto Sans JP', sans-serif;
}

/* Spotify link */
.spotify-link {
  background: #1db954;
  color: #fff;
}
.spotify-link .primary-icon {
  background: rgba(0,0,0,0.18);
  color: #fff;
  font-size: 22px;
}
.spotify-link .primary-arrow { color: #fff; }

/* Secondary links grid */
.detail-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}
.detail-link {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--fg);
  letter-spacing: 0.03em;
  transition: background 0.15s;
}
.detail-link:active { background: var(--bg-elev-2); }
.detail-link-icon {
  margin-right: 8px;
  font-size: 14px;
}

/* ===== Footer ===== */
.site-footer {
  padding: 32px 20px calc(40px + env(safe-area-inset-bottom));
  text-align: center;
  font-size: 11px;
  color: var(--fg-dimmer);
  line-height: 1.8;
}
.site-footer a {
  text-decoration: underline;
  text-underline-offset: 2px;
  color: var(--fg-dim);
}

/* ===== Animations ===== */
@keyframes slideUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.detail-view[data-animating] { animation: slideUp 0.25s ease both; }

/* ===== Larger screens ===== */
@media (min-width: 640px) {
  .detail-title-ja { font-size: 42px; }
  .detail-links { grid-template-columns: repeat(4, 1fr); }
  .header-inner { height: 60px; }
  body { padding-top: calc(180px + env(safe-area-inset-top, 0px)); }
}