/* HSK 1-9 card system — ink & vermilion, paper editorial */
:root{
  --paper:#f7f4ee;
  --card:#ffffff;
  --ink:#221f1c;
  --ink-soft:#5c564e;
  --line:#e2ddd3;
  --line-strong:#c9c2b4;
  --red:#b03a2a;
  --red-deep:#8e2d20;
  --jade:#33614f;
  --gold:#a8762c;
  --mark:#f6e3b6;
  --shadow:0 1px 2px rgba(34,31,28,.05), 0 4px 14px rgba(34,31,28,.07);
}
*{box-sizing:border-box}
html{font-size:16px}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:'Sarabun','Noto Sans SC',sans-serif;line-height:1.65;
}
.hz,.hanzi{font-family:'Noto Sans SC','Sarabun',sans-serif}
a{color:var(--red);text-decoration:none}
a:hover{color:var(--red-deep);text-decoration:underline}
main{max-width:1080px;margin:0 auto;padding:28px 20px 80px}

header.site{
  background:var(--card);border-bottom:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;
  padding:0 24px;height:64px;position:sticky;top:0;z-index:20;
}
header.site .brand{display:flex;align-items:baseline;gap:10px;color:var(--ink)}
header.site .brand:hover{text-decoration:none}
.brand-hz{font-family:'Noto Sans SC';font-weight:700;font-size:1.35rem;color:var(--red)}
.brand-txt{font-weight:600;font-size:1.02rem;letter-spacing:.01em}
header.site nav{display:flex;gap:4px}
header.site nav a{
  color:var(--ink-soft);font-size:.92rem;padding:8px 12px;border-radius:6px;
}
header.site nav a:hover{color:var(--ink);background:var(--paper);text-decoration:none}
header.site nav a.on{color:var(--red);font-weight:600}

h1{font-size:1.5rem;font-weight:700;margin:6px 0 4px}
h2{font-size:1.15rem;font-weight:600;margin:34px 0 12px;color:var(--ink)}
h2 .hz{color:var(--red);margin-right:8px}
.sub{color:var(--ink-soft);font-size:.92rem;margin:0 0 22px}
.rule{border:0;border-top:1px solid var(--line);margin:26px 0}

/* level grid */
.levels{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:14px}
.level-card{
  background:var(--card);border:1px solid var(--line);border-radius:10px;
  padding:16px 18px 14px;box-shadow:var(--shadow);position:relative;overflow:hidden;
  transition:transform .12s ease, border-color .12s ease;
}
.level-card:hover{transform:translateY(-2px);border-color:var(--line-strong);text-decoration:none}
.level-card .no{
  font-family:'Noto Sans SC';font-weight:700;font-size:1.9rem;color:var(--red);
  line-height:1;margin-bottom:6px;
}
.level-card .nm{font-weight:600;color:var(--ink);font-size:.98rem}
.level-card .ct{color:var(--ink-soft);font-size:.85rem;margin-top:2px}
.level-card .bar{position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--red)}
.level-card.l2 .bar{background:#c05a2e}.level-card.l3 .bar{background:var(--gold)}
.level-card.l4 .bar{background:#7a722e}.level-card.l5 .bar{background:var(--jade)}
.level-card.l6 .bar{background:#2f6266}.level-card.l7 .bar{background:#3d5480}
.level-card.l8 .bar{background:#6a4a7d}.level-card.l9 .bar{background:#7d3a55}

/* filters */
.filters{
  background:var(--card);border:1px solid var(--line);border-radius:10px;
  padding:14px 16px;margin:18px 0 22px;display:flex;flex-wrap:wrap;gap:10px;align-items:center;
}
.filters label{font-size:.86rem;color:var(--ink-soft);margin-right:2px}
.filters select,.filters input[type=text],.filters input[type=number]{
  font-family:inherit;font-size:.9rem;padding:7px 10px;border:1px solid var(--line-strong);
  border-radius:6px;background:#fffdf9;color:var(--ink);
}
.filters input[type=text]{min-width:220px}
.filters .go{
  background:var(--red);color:#fff;border:0;border-radius:6px;padding:8px 16px;
  font-family:inherit;font-size:.9rem;font-weight:600;cursor:pointer;
}
.filters .go:hover{background:var(--red-deep)}
.pinyin-keys{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 18px}
.pinyin-keys a{
  font-family:'Noto Sans SC';font-size:.88rem;padding:5px 10px;border:1px solid var(--line);
  border-radius:99px;background:var(--card);color:var(--ink-soft);
}
.pinyin-keys a.on,.pinyin-keys a:hover{border-color:var(--red);color:var(--red);background:#fff}

/* word list */
.wlist{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:10px}
.wrow{
  background:var(--card);border:1px solid var(--line);border-radius:8px;
  padding:12px 14px;display:flex;align-items:center;gap:12px;box-shadow:var(--shadow);
}
.wrow:hover{border-color:var(--line-strong)}
.wrow .hz{font-size:1.5rem;font-weight:500;color:var(--ink);min-width:2.4em}
.wrow .py{font-size:.86rem;color:var(--jade);font-style:italic}
.wrow .mn{font-size:.88rem;color:var(--ink-soft);flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.wrow .lv{font-size:.74rem;color:var(--ink-soft);border:1px solid var(--line);border-radius:99px;padding:1px 8px;white-space:nowrap}
.wrow .st{font-size:.76rem;color:var(--ink-soft);white-space:nowrap}
.pager{display:flex;gap:6px;justify-content:center;margin:26px 0 0;flex-wrap:wrap}
.pager a,.pager span{
  padding:6px 12px;border:1px solid var(--line);border-radius:6px;background:var(--card);
  font-size:.88rem;color:var(--ink-soft);
}
.pager .on{border-color:var(--red);color:var(--red);font-weight:600}

/* lesson cards */
.lessons{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}
.lcard{
  background:var(--card);border:1px solid var(--line);border-radius:8px;padding:14px 16px;
  box-shadow:var(--shadow);
}
.lcard .t{font-weight:600;font-size:.95rem}
.lcard .t .hz{color:var(--red);margin-right:6px}
.lcard .ws{margin-top:8px;font-family:'Noto Sans SC';font-size:1.05rem;color:var(--ink);line-height:1.9;word-spacing:.35em}
.lcard .ops{margin-top:10px;display:flex;gap:10px;font-size:.85rem}

/* lesson article */
.article{
  background:var(--card);border:1px solid var(--line);border-radius:10px;
  padding:20px 24px;box-shadow:var(--shadow);
}
.article .art-zh{font-family:'Noto Sans SC';font-size:1.25rem;margin:0 0 2px;line-height:2}
.article .art-en{font-size:.86rem;color:var(--ink-soft);margin:0 0 14px}
.article .art-zh:last-of-type{margin-bottom:0}

/* card page */
.cardwrap{max-width:760px;margin:0 auto}
.bigcard{
  background:var(--card);border:1px solid var(--line);border-radius:14px;
  box-shadow:var(--shadow);padding:34px 38px 26px;position:relative;
}
.bigcard .corner{
  position:absolute;top:18px;right:22px;font-size:.8rem;color:var(--ink-soft);
  border:1px solid var(--line);border-radius:99px;padding:2px 12px;
}
.hzrow{display:flex;align-items:flex-start;gap:26px;flex-wrap:wrap}
.hzmain{font-family:'Noto Sans SC';font-size:5.2rem;font-weight:500;line-height:1.05;color:var(--ink)}
.hzmain .trad{display:block;font-size:1.15rem;color:var(--ink-soft);font-weight:400;margin-top:2px}
.hzside{flex:1;min-width:220px}
.py{font-size:1.35rem;color:var(--jade);font-style:italic;margin-bottom:2px}
.meta{font-size:.85rem;color:var(--ink-soft);margin-bottom:12px}
.meta span{margin-right:14px}
.btn{
  display:inline-flex;align-items:center;gap:7px;border:1px solid var(--line-strong);
  background:#fffdf9;color:var(--ink);border-radius:7px;padding:8px 14px;cursor:pointer;
  font-family:inherit;font-size:.9rem;
}
.btn:hover{border-color:var(--red);color:var(--red)}
.btn.primary{background:var(--red);border-color:var(--red);color:#fff;font-weight:600}
.btn.primary:hover{background:var(--red-deep);color:#fff}
.btn.jade{background:var(--jade);border-color:var(--jade);color:#fff;font-weight:600}
.btn.jade:hover{background:#274d3f;color:#fff}
.btnrow{display:flex;gap:10px;flex-wrap:wrap;margin:14px 0 4px}

.sec{margin-top:26px}
.sec h3{
  font-size:.82rem;font-weight:600;color:var(--ink-soft);letter-spacing:.08em;
  text-transform:uppercase;margin:0 0 10px;padding-bottom:6px;border-bottom:1px solid var(--line);
}
.sec h3 .zh{font-family:'Noto Sans SC';color:var(--red);letter-spacing:0;text-transform:none;font-size:.95rem;margin-right:8px}
.meaning-th{font-size:1.12rem;font-weight:600;margin:2px 0 4px}
.meaning-en{font-size:.95rem;color:var(--ink-soft)}
.example{
  background:#fbf9f4;border-left:3px solid var(--gold);border-radius:0 8px 8px 0;
  padding:12px 16px;margin:6px 0;
}
.example .zh{font-family:'Noto Sans SC';font-size:1.18rem}
.example .py{font-size:.85rem;color:var(--jade);font-style:italic;margin:2px 0}
.example .tr{font-size:.9rem;color:var(--ink-soft)}
.example .tr.th{color:var(--ink)}
mark{background:var(--mark);color:inherit;padding:0 2px;border-radius:2px}

.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  font-family:'Noto Sans SC';background:#fffdf9;border:1px solid var(--line-strong);
  border-radius:99px;padding:4px 13px;font-size:.95rem;color:var(--ink);
}
.chip:hover{border-color:var(--red);color:var(--red);text-decoration:none;background:#fff}
.chip .py{font-size:.78rem;color:var(--ink-soft);margin-left:6px;font-style:italic}
.chip.ant{border-style:dashed}
.empty{color:var(--ink-soft);font-size:.88rem;font-style:italic}

.etym{display:flex;gap:22px;align-items:flex-start;flex-wrap:wrap}
.etym .glyph{
  width:120px;height:120px;border:1px solid var(--line);border-radius:10px;background:#fffdf9;
  display:flex;align-items:center;justify-content:center;flex:none;
}
.etym .glyph img{width:104px;height:104px}
.etym .txt{flex:1;min-width:240px;font-size:.93rem}
.etym .txt .k{color:var(--ink-soft)}
.etym .txt .decomp{font-family:'Noto Sans SC';font-size:1.15rem;color:var(--jade)}
.radical{
  display:inline-block;font-family:'Noto Sans SC';border:1px solid var(--line-strong);
  border-radius:6px;padding:1px 9px;margin-right:8px;color:var(--red);
}

.strokebox{
  background:#fffdf9;border:1px solid var(--line);border-radius:10px;padding:14px;
  display:flex;gap:14px;align-items:center;flex-wrap:wrap;
}
.strokebox .frame{width:190px;height:190px;border:1px solid var(--line);border-radius:8px;background:#fff;overflow:hidden;flex:none}
.strokebox .frame img{width:100%;height:100%}
.strokebox .ops{display:flex;flex-direction:column;gap:8px}
.strokebox .note{font-size:.85rem;color:var(--ink-soft);max-width:260px}

.imgsec img{max-width:340px;width:100%;border:1px solid var(--line);border-radius:10px;background:#fff}

/* nav between cards */
.cardnav{display:flex;justify-content:space-between;gap:12px;margin:18px 0 0}
.cardnav .btn{flex:1;justify-content:center}

/* study mode */
.study{max-width:640px;margin:0 auto;text-align:center}
.study .deck{margin:26px 0 8px}
.study .counter{font-size:.85rem;color:var(--ink-soft);margin-bottom:14px}
.study .bigcard{text-align:left}
.reveal{margin-top:14px}
.study .answers{display:flex;gap:12px;justify-content:center;margin-top:22px}
.study .answers .btn{min-width:150px;justify-content:center;font-size:1rem;padding:12px 18px}
.progress{height:5px;background:var(--line);border-radius:99px;overflow:hidden;margin:18px 0 0}
.progress i{display:block;height:100%;background:var(--jade);width:0}
.summary{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:30px;box-shadow:var(--shadow)}
.summary .big{font-family:'Noto Sans SC';font-size:2.6rem;color:var(--jade);font-weight:700}

footer{
  max-width:1080px;margin:40px auto 0;padding:18px 20px;border-top:1px solid var(--line);
  color:var(--ink-soft);font-size:.8rem;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
}
footer a{color:var(--ink-soft)}
@media (max-width:640px){
  header.site{flex-direction:column;height:auto;padding:10px 14px;gap:6px}
  .hzmain{font-size:3.6rem}
  .bigcard{padding:22px 18px}
}