/* Khung bài ngữ pháp 语法盒 — mỗi điểm HSK 3.0 một bài (ngu-phap/<cấp>-<số>/index.html). Theo quy chuẩn giao diện shared/kit:
   pastel, bo tròn lớn, chữ Hán Khải thư (LXGW WenKai), 语言点 = lav, 练习 = peach, 例句 = sky, 偏误 = coral. */
:root{--c:var(--teal);--cs:var(--teal-s);--kh:"LXGW WenKai","STKaiti","KaiTi","Kaiti SC",serif}
[hidden]{display:none!important}
.np-bar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:space-between;padding:18px 0 4px}
.np-crumb{font-size:14px;color:var(--muted);display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.np-crumb a{color:var(--c);text-decoration:none;font-weight:700}
.np-crumb .zh{font-family:var(--hz)}
/* nút Pinyin / Nghĩa: công tắc nhỏ nổi ở góc dưới phải */
.np-tools{position:fixed;right:max(14px,env(safe-area-inset-right));bottom:max(14px,env(safe-area-inset-bottom));z-index:30;display:flex;gap:2px;padding:3px;white-space:nowrap;
  background:color-mix(in srgb,var(--card) 82%,transparent);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--line);border-radius:999px;box-shadow:0 4px 14px rgba(40,30,80,.12)}
.np-tools .lb{display:none}
.np-tools .tg{border:0;background:none;color:var(--faint);font-size:12px;font-weight:700;padding:5px 11px;border-radius:999px;display:inline-flex;align-items:center;gap:5px;transition:background .15s,color .15s}
.np-tools .tg::before{content:"";width:6px;height:6px;border-radius:50%;background:currentColor;opacity:.45}
.np-tools .tg[aria-pressed="true"]{background:var(--cs);color:var(--c);border:0}
.np-tools .tg[aria-pressed="true"]::before{opacity:1}
.np-tools .tg:hover{color:var(--c)}
body{padding-bottom:64px}
.tg{border:1.5px solid var(--line);background:var(--card);color:var(--ink);font:inherit;font-weight:700;font-size:13.5px;padding:7px 13px;border-radius:999px;cursor:pointer}
.tg[aria-pressed="true"]{background:var(--c);border-color:var(--c);color:#fff}
.tg.solid{background:var(--ink);border-color:var(--ink);color:var(--card)}

.sec{background:var(--card);border-radius:26px;box-shadow:var(--shadow);padding:26px 28px;margin-top:22px;border-top:8px solid var(--sc,var(--c));--sc:var(--c);--ss:var(--cs)}
.sec.lav{--sc:var(--lav);--ss:var(--lav-s)} .sec.sky{--sc:var(--sky);--ss:var(--sky-s)} .sec.coral{--sc:var(--coral);--ss:var(--coral-s)}
.sec.peach{--sc:var(--peach);--ss:var(--peach-s)} .sec.mint{--sc:var(--mint);--ss:var(--mint-s)} .sec.butter{--sc:var(--butter);--ss:var(--butter-s)}
.sec>h2{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;font-size:21px;font-weight:800;margin-bottom:14px}
.sec>h2 .zh{font-family:var(--hz);font-weight:400;color:var(--sc);font-size:24px}
.sec>h2 .n{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:10px;background:var(--sc);color:#fff;font-size:15px;align-self:center}
.sec p{line-height:1.65;margin:8px 0}
.zh,.hz{font-family:var(--kh)}

/* Bìa */
.cover{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:26px;align-items:center;border-top-width:10px}
.cover .gly{float:right;margin:0 0 8px 14px;width:92px;height:92px;border-radius:26px;background:var(--cs);color:var(--c);display:grid;place-items:center;text-align:center;font-family:var(--kh);font-size:58px;line-height:1.05;padding:6px;transform:rotate(4deg);box-shadow:0 6px 0 color-mix(in srgb,var(--c) 25%,transparent)}
.cover .gly.n2{font-size:38px}.cover .gly.n3{font-size:25px}.cover .gly.n4{font-size:19px}.cover .gly{white-space:nowrap}
.cover .d25{color:var(--muted);font-size:13.5px;margin-top:10px;line-height:1.6}
.cover .d25 a{color:var(--c);text-decoration:none;overflow-wrap:anywhere}
.cover .d25 .zh{font-size:15px}
.cover .code{display:inline-flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:14px;font-weight:700;color:var(--muted)}
.cover .code b{font-family:var(--kh);font-size:17px;color:#fff;background:var(--c);border-radius:10px;padding:3px 10px}
.cover h1{font-family:"ZCOOL KuaiLe",var(--hz);font-weight:400;font-size:clamp(42px,8vw,86px);line-height:1.1;margin:10px 0 4px;color:var(--c);overflow-wrap:anywhere}
.cover h1 .qm{color:var(--coral)}
.cover .vi{font-size:clamp(18px,2.4vw,23px);font-weight:800}
.cover .goal{background:var(--cs);border-radius:20px;padding:16px 18px}
.cover .goal h3{font-size:14px;letter-spacing:.06em;text-transform:uppercase;color:var(--c);margin-bottom:6px}
.cover .goal ul{margin:0;padding-left:20px;line-height:1.6}

/* Công thức */
.rule{border:2px solid var(--ss);border-radius:22px;padding:16px 18px;margin-top:14px}
.rule h3{font-size:16.5px;font-weight:800;display:flex;gap:8px;align-items:baseline;flex-wrap:wrap}
.rule h3 small{font-weight:600;color:var(--muted);font-size:14px}
.fx{display:flex;flex-wrap:wrap;gap:8px;align-items:flex-start;margin:12px 0 6px}
.fx span{display:grid;justify-items:center;gap:3px}
.fx b{font-family:var(--kh);font-weight:400;font-size:24px;line-height:1.2;padding:6px 14px;border-radius:14px;border:2px dashed var(--sc);color:var(--ink);background:var(--card);white-space:nowrap}
.fx .k b{background:var(--sc);border:2px solid var(--sc);color:#fff}
/* công thức tô màu: ô thứ n ↔ {n|…} trong câu ví dụ */
.fx.col .s1{--q:var(--sky);--qs:var(--sky-s)} .fx.col .s2{--q:var(--coral);--qs:var(--coral-s)} .fx.col .s3{--q:var(--butter);--qs:var(--butter-s)}
.fx.col .s4{--q:var(--mint);--qs:var(--mint-s)} .fx.col .s5{--q:var(--rose);--qs:var(--rose-s)} .fx.col .s6{--q:var(--teal);--qs:var(--teal-s)}
.fx.col b{border:2px solid var(--q);background:var(--qs);border-radius:14px 14px 14px 4px}
.fx.col .k b{background:var(--q);border-color:var(--q);color:#fff}
.fx.col i{color:var(--q);font-weight:700}
.sg{border-radius:7px;padding:0 3px;margin:0 1px;box-decoration-break:clone;-webkit-box-decoration-break:clone}
.sg.s1{--q:var(--sky);--qs:var(--sky-s)} .sg.s2{--q:var(--coral);--qs:var(--coral-s)} .sg.s3{--q:var(--butter);--qs:var(--butter-s)}
.sg.s4{--q:var(--mint);--qs:var(--mint-s)} .sg.s5{--q:var(--rose);--qs:var(--rose-s)} .sg.s6{--q:var(--teal);--qs:var(--teal-s)}
.sg{background:var(--qs);color:var(--q);box-shadow:inset 0 -3px 0 color-mix(in srgb,var(--q) 45%,transparent)}
.fx .plus{align-self:center;color:var(--faint);font-weight:800;padding:0 2px}
.fx i{font-style:normal;font-size:12px;color:var(--muted);text-align:center;max-width:120px;line-height:1.25}
.rule .mean{color:var(--muted);font-size:15px}
.rule .ex{margin-top:10px}
.note{background:var(--butter-s);border-radius:16px;padding:12px 16px;margin-top:14px;font-size:15px;line-height:1.6}
.note b.t{color:var(--butter)}

/* Câu ví dụ (dùng chung) */
.sn{display:grid;grid-template-columns:auto minmax(0,1fr);gap:0 10px;align-items:start;padding:8px 0}
.sn+.sn{border-top:1px dashed var(--line)}
.sn .no{font-size:13px;font-weight:800;color:var(--sc);min-width:22px;padding-top:6px}
.sn .l1{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap}
.sn .z{font-family:var(--kh);font-size:25px;line-height:1.4;color:var(--ink)}
.sn .z mark{background:none;color:var(--sc);font-weight:700;border-bottom:3px solid color-mix(in srgb,var(--sc) 40%,transparent)}
.sn .p{font-size:15px;color:var(--sc);margin-top:1px}
.sn .v{font-size:15px;color:var(--muted)}
.sn .src{font-size:11px;font-weight:700;color:var(--faint);border:1px solid var(--line);border-radius:6px;padding:1px 6px;white-space:nowrap}
body.hide-py .sn .p,body.hide-vi .sn .v{visibility:hidden;height:0;overflow:hidden;display:block}
.spk{border:0;background:var(--ss,var(--ground2));color:var(--sc,var(--c));width:30px;height:30px;border-radius:50%;cursor:pointer;font-size:14px;flex:none;align-self:center}

/* So sánh tiếng Việt */
.cmp{display:grid;gap:10px}
.cmp .row{display:grid;grid-template-columns:minmax(0,1fr) 34px minmax(0,1fr);gap:8px;align-items:center;background:var(--ground2);border-radius:16px;padding:12px 14px}
.cmp .vn{font-size:16px;font-weight:600}
.cmp .ar{text-align:center;color:var(--sc);font-weight:800;font-size:20px}
.cmp .cn .z{font-family:var(--kh);font-size:23px}
.cmp .why{grid-column:1/-1;font-size:14px;color:var(--muted)}
.cmp .ok{color:var(--mint);font-weight:800} .cmp .no{color:var(--coral);font-weight:800}

/* Lỗi hay gặp */
.errs{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr));gap:12px}
.err{border-radius:18px;background:var(--ground2);padding:14px 16px;display:grid;gap:4px}
.err .bad{font-family:var(--kh);font-size:22px;color:var(--coral);text-decoration:line-through;text-decoration-thickness:2px}
.err .bad::before{content:"";display:inline-block;width:.8em;height:.8em;margin-right:.3em;vertical-align:-.05em;background:currentColor;-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6.5 6.5l11 11M17.5 6.5l-11 11'/%3E%3C/svg%3E") center/contain no-repeat;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6.5 6.5l11 11M17.5 6.5l-11 11'/%3E%3C/svg%3E") center/contain no-repeat}
.err .good{font-family:var(--kh);font-size:22px;color:var(--mint)}
.err .good::before{content:"";display:inline-block;width:.8em;height:.8em;margin-right:.3em;vertical-align:-.05em;background:currentColor;-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5 9.8 17 19 7.5'/%3E%3C/svg%3E") center/contain no-repeat;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5 9.8 17 19 7.5'/%3E%3C/svg%3E") center/contain no-repeat}
.err .why{font-size:14px;color:var(--muted);line-height:1.5}

/* Luyện tập */
.ex-grp{margin-top:18px}
.ex-grp:first-of-type{margin-top:4px}
.ex-grp h3{font-size:16px;font-weight:800;margin-bottom:8px}
.ex-grp h3 small{font-weight:600;color:var(--muted)}
.qz{border:2px solid var(--ground2);border-radius:18px;padding:12px 14px;margin-top:10px}
.qz .qt{font-weight:700;display:flex;gap:8px;align-items:baseline;flex-wrap:wrap}
.qz .qt .n{color:var(--sc);font-weight:800}
.qz .qt .z{font-family:var(--kh);font-size:22px;font-weight:400}
.opts{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
.opt{border:2px solid var(--line);background:var(--card);color:var(--ink);font:inherit;font-family:var(--kh);font-size:20px;padding:6px 14px;border-radius:14px;cursor:pointer;text-align:left}
.opt:hover{border-color:var(--sc)}
.opt.right{border-color:var(--mint);background:var(--mint-s)}
.opt.wrong{border-color:var(--coral);background:var(--coral-s);text-decoration:line-through}
.fb{font-size:14.5px;margin-top:8px;line-height:1.5}
.fb.ok b{color:var(--mint)} .fb.no b{color:var(--coral)}
.pool,.line{display:flex;flex-wrap:wrap;gap:8px;min-height:48px;align-items:center}
.line{border-bottom:2px dashed var(--line);padding:6px 0 8px;margin:8px 0}
.chip{border:2px solid var(--sc);background:var(--ss);color:var(--ink);font:inherit;font-family:var(--kh);font-size:21px;padding:4px 12px;border-radius:12px;cursor:pointer}
.chip.used{opacity:.25;pointer-events:none}
.line .chip{background:var(--card)}
.acts{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
.btn2{border:0;background:var(--sc);color:#fff;font:inherit;font-weight:700;font-size:14px;padding:7px 14px;border-radius:999px;cursor:pointer}
.btn2.ghost{background:var(--ground2);color:var(--ink)}
.ans{margin-top:8px;background:var(--mint-s);border-radius:12px;padding:8px 12px}
.ans .z{font-family:var(--kh);font-size:21px;color:var(--mint)}
.bad-s{font-family:var(--kh);font-size:22px;color:var(--coral)}

/* Liên quan */
.rel{display:flex;flex-wrap:wrap;gap:8px}
.rel a,.rel span{display:inline-flex;gap:6px;align-items:baseline;text-decoration:none;color:var(--ink);background:var(--ground2);border-radius:12px;padding:6px 12px;font-size:14px;border:1.5px solid transparent}
.rel a:hover{border-color:var(--sc)}
.rel b{color:var(--sc);font-family:var(--kh);font-weight:400;font-size:15px}
.rel .zh{font-family:var(--kh);font-size:15.5px}
.rel .soon{opacity:.6}
.pn{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-top:22px}
.pn a{flex:1 1 220px;text-decoration:none;color:var(--ink);background:var(--card);box-shadow:var(--shadow);border-radius:18px;padding:12px 16px;font-size:14px}
.pn a b{display:block;font-family:var(--kh);font-weight:400;font-size:18px;color:var(--c)}
.pn a.nx{text-align:right}
.copy{text-align:center;color:var(--muted);font-size:13px;margin:26px 0 10px}

/* Trình chiếu: mỗi mục một màn */
body.present .np-bar,body.present header.top,body.present .pn,body.present footer{display:none}
body.present .sec{display:none;margin:0 auto;min-height:calc(100dvh - 90px);max-width:1180px;font-size:calc(16px*var(--z,1.25))}
body.present .sec.on{display:block}
body.present .sec>h2{font-size:1.5em}
body.present .sn .z,body.present .fx b{font-size:calc(28px*var(--z,1.25))}
body.present .err .bad,body.present .err .good{font-size:calc(24px*var(--z,1.25))}
body.present main{padding-top:14px}
.pnav{position:fixed;left:50%;bottom:12px;transform:translateX(-50%);display:none;gap:8px;align-items:center;background:var(--ink);color:var(--card);border-radius:999px;padding:6px 8px;z-index:50;box-shadow:var(--shadow)}
body.present .pnav{display:flex}
.pnav button{border:0;background:transparent;color:inherit;font:inherit;font-weight:800;font-size:15px;min-width:36px;height:34px;border-radius:999px;cursor:pointer}
.pnav button:hover{background:rgba(255,255,255,.15)}
.pnav span{font-size:13px;opacity:.8;padding:0 4px}

@media (max-width:820px){.cover{grid-template-columns:1fr}}
@media (max-width:600px){
  .sec{padding:18px 16px;border-radius:22px}
  .sec>h2{font-size:18px}
  .fx b{font-size:20px;padding:5px 10px}
  .sn .z{font-size:22px}
  .cmp .row{grid-template-columns:1fr;gap:4px}
  .cmp .ar{transform:rotate(90deg);width:20px}
  #presentBtn{display:none}
}
/* In bài — chỉ giáo viên (body.gv); menu In trong công tắc nổi */
.np-tools .tg.pr::before{display:none}
.np-tools .tg.pr{color:var(--c)}
.prm{position:absolute;right:0;bottom:calc(100% + 8px);display:grid;gap:4px;min-width:230px;background:var(--card);border:1px solid var(--line);border-radius:16px;padding:10px;box-shadow:0 10px 28px rgba(40,30,80,.18);white-space:normal}
.prm b{font-size:12.5px;color:var(--muted);padding:2px 8px 4px}
.prm button{border:0;background:none;font:inherit;text-align:left;padding:8px 10px;border-radius:10px;cursor:pointer;font-weight:700;font-size:14px;color:var(--ink);display:grid}
.prm button small{font-weight:500;font-size:12px;color:var(--muted)}
.prm button:hover{background:var(--cs)}
#printSheet{display:none}
@media print{
  @page{size:A4;margin:14mm 14mm 16mm}
  body{padding:0!important;background:#fff!important}
  .np-tools,.pn,header.top,footer,.acts,.spk,.typ{display:none!important}.sec{box-shadow:none;break-inside:avoid}
  /* học sinh / máy chưa mở chế độ giáo viên: không in nội dung */
  body.np-in:not(.gv)>*{display:none!important}
  body.np-in:not(.gv)::before{content:"Bản in chỉ dành cho giáo viên · 吕老师汉语盒 lyulaoshi.com";display:block;font:600 16px/1.5 "Be Vietnam Pro",sans-serif;padding:30mm 0;text-align:center}
  body.printing>*:not(#printSheet){display:none!important}
  body.printing #printSheet{display:block}
}
/* Phiếu in */
#printSheet{color:#000;font:13px/1.55 "Be Vietnam Pro",sans-serif}
#printSheet .zh{font-family:var(--kh);font-size:1.25em}
#printSheet .ph{border-bottom:2px solid #000;padding-bottom:8px;margin-bottom:10px}
#printSheet .brand{font-size:11px;color:#555}
#printSheet h1{font-size:20px;margin:4px 0 0;font-weight:800}
#printSheet .pvi{font-size:13.5px;font-weight:600}
#printSheet .who{display:flex;gap:18px;margin-top:10px;font-size:13px}
#printSheet .who span{flex:1;border-bottom:1px dotted #000;padding-bottom:2px}
#printSheet .who span:first-child{flex:2.2}
#printSheet h2{font-size:14.5px;font-weight:800;margin:14px 0 6px;break-after:avoid}
#printSheet .pr-rule{border:1px solid #999;border-radius:8px;padding:8px 10px;margin:6px 0;break-inside:avoid}
#printSheet .rt{font-weight:800}
#printSheet .pfx{font-family:var(--kh);font-size:16px;margin:4px 0;border:1.5px solid #000;border-radius:6px;padding:3px 8px;display:inline-block}
#printSheet .mn{color:#333;font-size:12.5px}
#printSheet ul{margin:4px 0;padding-left:18px}
#printSheet .perr li{margin:3px 0}
#printSheet .perr s{text-decoration-thickness:1px}
#printSheet ol.pq{padding-left:22px;margin:0}
#printSheet ol.pq>li{margin:0 0 9px;break-inside:avoid}
#printSheet .pv{font-style:italic;color:#444;font-size:12px}
#printSheet .po{display:flex;flex-wrap:wrap;gap:4px 22px;margin-top:3px}
#printSheet .chips{display:flex;flex-wrap:wrap;gap:6px;margin:4px 0}
#printSheet .chips span{border:1px solid #000;border-radius:5px;padding:0 7px;font-family:var(--kh);font-size:16px}
#printSheet .wl{border-bottom:1px solid #777;height:26px}
#printSheet .wl-i{display:inline-block;width:55%;border-bottom:1px solid #777;height:16px;vertical-align:bottom}
#printSheet .pda{break-before:page}
#printSheet .pda ol{padding-left:22px;margin:0}
#printSheet .pda li{margin:2px 0}
#printSheet .pfoot{margin-top:16px;border-top:1px solid #999;padding-top:4px;font-size:10.5px;color:#555}
.np-tools{position:fixed}
.cmp mark{background:none;color:var(--sc);font-weight:700;border-bottom:3px solid color-mix(in srgb,var(--sc) 40%,transparent)}
.sec{scroll-margin-top:70px}
.qz .qt .vq{font-weight:600}
.qz .qt .zh{font-size:20px;font-weight:400}
.qz .qt{display:block;line-height:1.6}.qz .qt>span{margin-right:6px}
.fx span{max-width:100%;min-width:0}.fx b{max-width:100%;white-space:normal;overflow-wrap:anywhere;text-align:center}
.qz .qvi{font-size:14.5px;font-weight:500;color:var(--muted);margin-top:3px;font-style:italic}
.typ{display:flex;gap:8px;margin-top:10px;flex-wrap:wrap}
.tin{flex:1 1 220px;min-width:0;font-family:var(--kh);font-size:21px;padding:8px 12px;border:2px solid var(--line);border-radius:12px;background:var(--card);color:var(--ink);outline:none}
.tin:focus{border-color:var(--sc)}
.tin.ok{border-color:var(--mint);background:var(--mint-s)}
.typ + .fb .tw{font-size:19px}
.typ + .fb mark.xw{background:var(--coral-s);color:var(--coral);border-radius:3px;text-decoration:underline wavy}
.typ + .fb .hint{font-size:13px;color:var(--muted);margin-top:4px}
body.present .tin{font-size:calc(24px*var(--z,1.25))}

/* icon tự vẽ dùng chung (/chung/ic.svg?v=c0a8a094) */
.lli{display:inline-block;width:1.2em;height:1.2em;flex:none;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;vertical-align:-.22em;overflow:visible}
.themebtn{display:inline-grid;place-items:center}.themebtn .lli{width:19px;height:19px}

.po .o{display:inline-block;width:.85em;height:.85em;border:1.5px solid currentColor;border-radius:2px;vertical-align:-.08em;font-style:normal}