:root {
  --bg: #f7f7f5; --panel: #ffffff; --text: #1d1d1f; --muted: #6e6e73;
  --line: #e3e3e0; --accent: #b03a2e; --accent-soft: #f6e4e2;
  --known: #2e7d32; --known-bg: #e6f2e6;
  --next: #9a7d00; --next-bg: #faf3d1;
  --hard: #b03a2e; --hard-bg: #f9e3e0;
  --beyond: #6e6e73; --beyond-bg: #ececea;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #171719; --panel: #212124; --text: #ececee; --muted: #9a9aa2;
    --line: #35353a; --accent: #e57368; --accent-soft: #3a2523;
    --known: #7fc784; --known-bg: #223524;
    --next: #d9c05a; --next-bg: #37321a;
    --hard: #e57368; --hard-bg: #3c2422;
    --beyond: #9a9aa2; --beyond-bg: #2c2c30;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.5 -apple-system, "Segoe UI", Roboto, "Noto Sans", "Noto Sans SC", sans-serif; }
header { display: flex; align-items: center; gap: 1.5rem; padding: .8rem 1.2rem;
  background: var(--panel); border-bottom: 1px solid var(--line); flex-wrap: wrap; }
header h1 { font-size: 1.05rem; margin: 0; color: var(--accent); cursor: pointer; }
#levelbox { display: flex; align-items: center; gap: .6rem; }
#levelbox input { width: 160px; accent-color: var(--accent); }
#userbox { margin-left: auto; display: flex; align-items: center; gap: .8rem; color: var(--muted); font-size: .9rem; }
main { max-width: 1060px; margin: 0 auto; padding: 1.2rem; }
.hidden { display: none !important; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  padding: 1.1rem 1.3rem; margin-bottom: 1rem; }
h2 { font-size: 1.15rem; margin: .1rem 0 .8rem; }
h3 { font-size: .95rem; margin: 1rem 0 .5rem; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
button { background: var(--accent); color: #fff; border: 0; border-radius: 8px;
  padding: .5rem 1rem; font-size: .95rem; cursor: pointer; }
button.ghost { background: transparent; color: var(--accent); border: 1px solid var(--line); }
button.small { padding: .25rem .6rem; font-size: .82rem; }
input[type=text], input[type=email], input[type=password], textarea {
  width: 100%; padding: .55rem .7rem; border: 1px solid var(--line); border-radius: 8px;
  background: var(--bg); color: var(--text); font-size: .95rem; }
textarea { min-height: 180px; font-family: inherit; }
form.stack > * { margin-bottom: .7rem; }
.error { color: var(--hard); font-size: .9rem; }
.muted { color: var(--muted); }
a { color: var(--accent); text-decoration: none; cursor: pointer; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: .7rem; margin-bottom: .5rem; }
.card { background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: .6rem .8rem; }
.card .num { font-size: 1.5rem; font-weight: 650; }
.card .lbl { font-size: .78rem; color: var(--muted); }

.distbar { display: flex; height: 22px; border-radius: 6px; overflow: hidden; margin: .4rem 0 .2rem; }
.distbar div { height: 100%; }
.legend { display: flex; flex-wrap: wrap; gap: .8rem; font-size: .8rem; color: var(--muted); margin-top: .4rem; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 4px; }

.lyrics { font-size: 1.35rem; line-height: 2.2; }
.lyrics .tok { border-radius: 5px; padding: 0 2px; cursor: pointer; }
.tok.known { color: var(--known); background: var(--known-bg); }
.tok.next { color: var(--next); background: var(--next-bg); }
.tok.hard { color: var(--hard); background: var(--hard-bg); }
.tok.beyond { color: var(--beyond); background: var(--beyond-bg); }
.tok.filler, .tok.latin { color: var(--muted); }
.tok.idiom { text-decoration: underline dotted; }

#popover { position: absolute; z-index: 10; background: var(--panel); border: 1px solid var(--line);
  border-radius: 8px; padding: .6rem .8rem; box-shadow: 0 4px 18px rgba(0,0,0,.18); font-size: .9rem; }
#popover b { font-size: 1.2rem; }

table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th, td { text-align: left; padding: .45rem .5rem; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; font-size: .8rem; cursor: pointer; user-select: none; }
tr.clickable { cursor: pointer; }
tr.clickable:hover td { background: var(--accent-soft); }
.pill { display: inline-block; padding: .05rem .5rem; border-radius: 99px; font-size: .78rem; }
.pill.l1,.pill.l2 { background: var(--known-bg); color: var(--known); }
.pill.l3,.pill.l4 { background: var(--next-bg); color: var(--next); }
.pill.l5,.pill.l6,.pill.l7 { background: var(--hard-bg); color: var(--hard); }
.pill.l8,.pill.l9 { background: var(--beyond-bg); color: var(--beyond); }
.wordlist { display: flex; flex-wrap: wrap; gap: .4rem; }
.rank { font-weight: 700; color: var(--accent); }
.rowactions { display: flex; gap: .5rem; align-items: center; }
.topline { display: flex; align-items: baseline; gap: 1rem; flex-wrap: wrap; }
.topline h2 { margin-right: auto; }