:root{
  --bg:#f4f1ec; --card:#ffffff; --ink:#1c2230; --dim:#6b7486; --line:#dfd9d0;
  --accent:#1f4f8b; --accent-ink:#ffffff; --warm:#e0a33a; --warm-soft:#fdf3e0;
  --ok-bg:#eef3f9; --ok-ink:#1f4f8b; --no-bg:#f3f0ec; --no-ink:#7a6a52;
  --shadow:0 1px 2px rgba(28,34,48,.06), 0 8px 24px rgba(28,34,48,.07);
  --r:18px;
}
@media (prefers-color-scheme:dark){ :root:not([data-theme="light"]){
  --bg:#14171d; --card:#1d222b; --ink:#eceef3; --dim:#9aa3b4; --line:#2b323e;
  --accent:#7fb0e8; --accent-ink:#10141a; --warm:#e8b35c; --warm-soft:#2a2418;
  --ok-bg:#1e2a3a; --ok-ink:#9cc6f2; --no-bg:#262319; --no-ink:#d8bf8d;
  --shadow:0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.35);
}}
:root[data-theme="dark"]{
  --bg:#14171d; --card:#1d222b; --ink:#eceef3; --dim:#9aa3b4; --line:#2b323e;
  --accent:#7fb0e8; --accent-ink:#10141a; --warm:#e8b35c; --warm-soft:#2a2418;
  --ok-bg:#1e2a3a; --ok-ink:#9cc6f2; --no-bg:#262319; --no-ink:#d8bf8d;
  --shadow:0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html{font-size:118%}
html,body{height:100%}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  -webkit-text-size-adjust:100%;
}
/* 整屏撑满：上下一排，中间那张卡片吃掉剩下的全部高度 */
.wrap{
  width:100%; max-width:1100px; margin:0 auto;
  min-height:100%;
  display:flex; flex-direction:column;
  padding-block:16px; padding-left:20px; padding-right:20px;
}
.wrap.st-home{justify-content:center}
/* 内容高的几页靠上排，不然上半截会被推到屏幕外 */
.wrap.st-done, .wrap.st-hist, .wrap.st-fam{justify-content:flex-start}
.card.fill{flex:1 1 auto; display:flex; flex-direction:column; justify-content:center}
h1{font-size:1.45rem; margin:0 0 4px; letter-spacing:-.01em}
.sub{color:var(--dim); font-size:.95rem; margin:0 0 20px}
.card{background:var(--card); border:1px solid var(--line); border-radius:var(--r); box-shadow:var(--shadow); padding:22px}
.btn{
  display:block; width:100%; border:1px solid var(--line); border-radius:14px;
  background:var(--card); color:var(--ink); font:inherit; font-size:1.1rem; font-weight:600;
  padding:16px 18px; cursor:pointer; -webkit-tap-highlight-color:transparent;
}
.btn:active{transform:translateY(1px)}
.btn.primary{background:var(--accent); color:var(--accent-ink); border-color:transparent; font-size:1.2rem; padding:20px}
.btn:focus-visible{outline:3px solid var(--warm); outline-offset:2px}
.rules{list-style:none; padding:0; margin:18px 0 0}
.rules li{display:flex; gap:10px; padding:9px 0; border-top:1px dashed var(--line); font-size:.98rem; line-height:1.55}
.rules li:first-child{border-top:0}
.rules b{font-weight:700}
.tag{display:inline-block; font-size:.78rem; letter-spacing:.06em; text-transform:uppercase;
  color:var(--dim); border:1px solid var(--line); border-radius:999px; padding:3px 10px}
.nav{display:flex; justify-content:space-between; gap:10px; margin:0 0 14px}
.nav button{border:1px solid var(--line); background:var(--card); color:var(--dim);
  border-radius:999px; padding:8px 16px; font:inherit; font-size:.92rem; cursor:pointer;
  -webkit-tap-highlight-color:transparent}
.nav button:active{transform:translateY(1px)}
.nav .sp{flex:1}
.prog{display:flex; gap:5px; margin:0 0 18px}
.prog i{flex:1; height:5px; border-radius:99px; background:var(--line)}
.prog i.on{background:var(--accent)}
.word{font-size:3.1rem; font-weight:800; letter-spacing:-.02em; line-height:1.1; margin:6px 0 2px; word-break:break-word}
.ipa{color:var(--dim); font-size:1.15rem; margin:0 0 18px; font-family:ui-monospace,"SF Mono",Menlo,monospace}
.pos{display:inline-block; font-family:inherit; font-size:.8rem; letter-spacing:.04em; color:var(--dim);
  border:1px solid var(--line); border-radius:999px; padding:3px 11px; vertical-align:middle}
.exrow{cursor:pointer; -webkit-tap-highlight-color:transparent}
.exrow:active{transform:translateY(1px)}
.exrow.second{margin-top:13px; padding-top:13px; border-top:1px dashed var(--line)}
.say{display:inline-flex; align-items:center; gap:8px; border:1px solid var(--line); background:var(--card);
  color:var(--ink); border-radius:999px; padding:10px 18px; font:inherit; font-size:1rem; cursor:pointer}
.pair{display:grid; grid-template-columns:1fr 1fr; gap:12px; margin-top:24px}
.pair button{font-size:1.15rem; padding:20px 10px}
.yes{background:var(--ok-bg); color:var(--ok-ink); border-color:transparent}
.no{background:var(--no-bg); color:var(--no-ink); border-color:transparent}
.emoji{font-size:4rem; line-height:1; margin:2px 0 10px}
.cn{font-size:1.6rem; font-weight:700; margin:0 0 14px}
.ex{background:var(--warm-soft); border-radius:14px; padding:16px 18px; margin:0 0 18px}
.mthtag{display:inline-block; font-size:.76rem; letter-spacing:.04em; color:var(--dim);
  border:1px solid var(--line); border-radius:999px; padding:3px 10px; margin:0 0 10px}
.ex .en{font-size:1.08rem; font-weight:600; margin:0 0 6px; line-height:1.5}
.ex .zh{color:var(--dim); font-size:.98rem; margin:0; line-height:1.5}
.uses{margin:0 0 18px; text-align:left}
.uses p{display:flex; align-items:baseline; gap:10px; margin:0 0 8px; padding:10px 14px;
        border:1px solid var(--line); border-radius:12px; background:var(--card)}
.uses b{font-size:1.02rem; letter-spacing:.01em}
.uses span{color:var(--dim); font-size:.92rem; margin-left:auto; white-space:nowrap}
.uses .pex{flex-basis:100%; margin-left:0; white-space:normal; text-align:left;
  margin-top:8px; padding-top:8px; border-top:1px dashed var(--line); line-height:1.5}
.uses .pex i{font-style:normal; opacity:.85}
.uses .ptag{font-style:normal; font-size:.74rem; letter-spacing:.08em; color:var(--dim);
  border:1px solid var(--line); border-radius:999px; padding:3px 9px; flex:0 0 auto}
.uses p[data-s]{cursor:pointer; -webkit-tap-highlight-color:transparent}
.uses p[data-s]:active{transform:translateY(1px)}
.uses .spk{font-style:normal; flex:0 0 auto; opacity:.5; font-size:1rem; margin-left:10px}
.fam{border:1px solid var(--line); border-radius:14px; padding:18px; margin:0 0 14px; background:var(--card)}
.chain{display:flex; flex-wrap:wrap; align-items:center; gap:8px; margin:0 0 12px}
.chain span{font-size:1.25rem; font-weight:700}
.chain em{color:var(--dim); font-style:normal; font-size:1.1rem}
.rule{font-size:1.06rem; font-weight:700; color:var(--ink); line-height:1.55;
  margin:0 0 16px; padding:13px 16px; background:var(--warm-soft); border-radius:12px}
.same{margin:0 0 4px}
.same .lbl{display:block; font-size:.78rem; letter-spacing:.1em; color:var(--dim); margin:0 0 9px}
.same ul{list-style:none; padding:0; margin:0; display:flex; flex-wrap:wrap; gap:8px}
.same li{border:1px solid var(--line); border-radius:999px; padding:7px 15px; font-size:.98rem; line-height:1.3}
.same li[data-s]{cursor:pointer; -webkit-tap-highlight-color:transparent}
.same li[data-s]:active{transform:translateY(1px); background:var(--warm-soft)}
.tip{display:flex; gap:9px; font-size:.95rem; color:var(--dim); line-height:1.65;
  margin:16px 0 0; padding-top:14px; border-top:1px dashed var(--line)}
.tip b{color:var(--ink)}
.note{font-size:.95rem; color:var(--dim); line-height:1.6; margin:6px 0 0}
.note b{color:var(--ink)}
.res{display:flex; gap:12px; margin:0 0 20px}
.res div{flex:1; text-align:center; border:1px solid var(--line); border-radius:14px; padding:16px 8px; background:var(--card)}
.res .n{font-size:2.2rem; font-weight:800; line-height:1}
.res .l{color:var(--dim); font-size:.9rem; margin-top:4px}
.list{list-style:none; padding:0; margin:0}
.list li{display:flex; justify-content:space-between; align-items:center; gap:12px;
  padding:12px 0; border-top:1px solid var(--line); font-size:1.02rem}
.list li:first-child{border-top:0}
.list .w{font-weight:700}
.list .m{color:var(--dim); font-size:.93rem; text-align:right}
.mark{font-weight:800; font-size:1.05rem}
.cold{background:var(--warm-soft); border-radius:14px; padding:16px 18px; margin:18px 0}
.cold h3{margin:0 0 8px; font-size:1.05rem}
.foot{color:var(--dim); font-size:.9rem; line-height:1.6; margin-top:22px; text-align:center}
@media (max-width:420px){ .word{font-size:2.5rem} .emoji{font-size:3.2rem} .pair button{font-size:1.05rem} }
@media (min-width:700px){
  .word{font-size:4rem}
  .ipa{font-size:1.4rem}
  .cn{font-size:2rem}
  .emoji{font-size:4.8rem}
  .ex .en{font-size:1.25rem}
  .ex .zh{font-size:1.1rem}
  .pair button{font-size:1.4rem; padding:26px 10px}
  .chain span{font-size:1.5rem}
  .rule{font-size:1.2rem}
  .same li{font-size:1.08rem}
  .btn{font-size:1.2rem}
  .btn.primary{font-size:1.35rem}
  .uses b{font-size:1.3rem}
  .uses span{font-size:1.12rem}
  .uses .pex{font-size:1.12rem}
  .uses .ptag{font-size:.85rem}
  .say{font-size:1.15rem; padding:12px 22px}
  .tip{font-size:1.05rem}
  .same .lbl{font-size:.88rem}
}