:root {
  --bg: #1b1f27;
  --card: #262b36;
  --text: #e8eaf0;
  --muted: #9aa3b2;
  --accent: #4fd1c5;
  --good: #4fd17d;
  --ok: #e0c341;
  --hard: #e05f4f;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  padding-bottom: 3rem;
}

header {
  padding: 1.25rem 1rem 0.5rem;
}

h1 { font-size: 1.25rem; margin: 0; }
h2 { font-size: 1.05rem; color: var(--muted); font-weight: 600; }

main { padding: 0 1rem; max-width: 600px; margin: 0 auto; }

.hidden { display: none !important; }

input, button {
  font-size: 1rem;
  padding: 0.65rem 0.9rem;
  border-radius: 0.6rem;
  border: 1px solid #3a4150;
  background: var(--card);
  color: var(--text);
}

button { cursor: pointer; border-color: var(--accent); }
button.secondary { border-color: #3a4150; background: transparent; }

.button {
  display: inline-block;
  text-decoration: none;
  background: var(--accent);
  color: #0a0f14;
  font-weight: 600;
  padding: 0.7rem 1.1rem;
  border-radius: 0.6rem;
}

#login-form { display: flex; gap: 0.5rem; }
.error { color: var(--hard); min-height: 1.2em; }
.meta { color: var(--muted); font-size: 0.85rem; }

.list { list-style: none; padding: 0; margin: 0; }
.list li {
  background: var(--card);
  margin-bottom: 0.5rem;
  padding: 0.8rem 1rem;
  border-radius: 0.6rem;
  cursor: pointer;
}
.list li:active { opacity: 0.7; }

.tabs { display: flex; gap: 0.5rem; margin: 0.75rem 0; }
.tab-button {
  flex: 1;
  background: transparent;
  border: 1px solid #3a4150;
}
.tab-button.active { background: var(--accent); color: #0a0f14; border-color: var(--accent); }

.song-card {
  background: var(--card);
  border-radius: 0.7rem;
  padding: 0.9rem 1rem;
  margin-bottom: 0.7rem;
}
.song-card .row { display: flex; justify-content: space-between; align-items: center; gap: 0.5rem; }
.song-card .title { font-weight: 600; }
.song-card .artist { color: var(--muted); font-size: 0.9rem; }
.badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: 1rem;
  white-space: nowrap;
}
.badge.good { background: var(--good); color: #0a0f14; }
.badge.ok { background: var(--ok); color: #0a0f14; }
.badge.hard { background: var(--hard); color: #0a0f14; }
.badge.unknown { background: #3a4150; color: var(--muted); }

.detail { margin-top: 0.6rem; font-size: 0.85rem; color: var(--muted); }
.detail a { color: var(--accent); }

.lyrics-toggle {
  margin-top: 0.5rem;
  background: transparent;
  border: none;
  color: var(--accent);
  padding: 0.2rem 0;
  font-size: 0.85rem;
}

.lyrics-block { margin-top: 0.5rem; font-size: 0.95rem; line-height: 1.6; }
.lyrics-line { margin-bottom: 0.45rem; }
.lyrics-line .hanzi { display: block; }
.lyrics-line .pinyin { display: block; color: var(--accent); font-size: 0.8em; }

.loading {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  text-align: center;
  color: #0a0f14;
  background: var(--accent);
  font-weight: 600;
  padding: 0.6rem;
}