/* "✍️ Luyện viết chữ" — thư viện tự học nét cơ bản chữ Hán (Cổng học viên).
   Tự chứa, prefix .lvc-. Dữ liệu nét lấy từ hanzi-writer-data (CDN), KHÔNG tự vẽ tay.
   Xem BAN-GIAO-luyen-viet-chu.md — các lớp o-vien/o-ke/chu-mo/net/net-mo/mui/mui-dau/so-nen/so-chu
   giữ ĐÚNG tên đã cho trong bản bàn giao (dùng chung cho cả màn hình lẫn phiếu in). */

.lvc-ov{ position:fixed; inset:0; z-index:1400; display:none; align-items:flex-start; justify-content:center;
  background:rgba(30,22,10,.55); backdrop-filter:blur(3px); padding:16px; overflow-y:auto; }
.lvc-ov.open{ display:flex; }
.lvc-ov{ --kem:#FBF7F0; --kem2:#F4EDE1; --muc:#2E2A24; --mo:#7A7166; --oliu:#6B7A4F; --oliu-d:#55643D;
  --mut:#C89A3C; --do:#C0392B; --xanh:#2F6FA8; --vien:#E2D8C6; --ke:#E0BFB8; }
.lvc-sheet{ width:min(1180px,97vw); margin:auto; background:var(--kem); border:1px solid var(--vien);
  border-radius:22px; box-shadow:0 24px 60px -20px rgba(40,25,5,.6); overflow:hidden; color:var(--muc);
  font-family:inherit; }
.lvc-head{ display:flex; align-items:center; gap:10px; padding:15px 18px; background:linear-gradient(165deg,#3c4720,#2c3419);
  color:#f6efdd; border-bottom:2px solid #a9781f; }
.lvc-head .back{ background:rgba(255,255,255,.16); border:none; color:#fff; min-width:38px; height:38px; padding:0 12px;
  border-radius:19px; font-size:.9rem; font-weight:700; cursor:pointer; }
.lvc-head .t{ font-weight:800; font-size:1.12rem; flex:1; color:#e9dcb6; }
.lvc-head .x{ background:rgba(255,255,255,.16); border:none; color:#fff; width:36px; height:36px; border-radius:50%; font-size:1rem; cursor:pointer; flex:none; }
.lvc-body{ padding:18px 18px 26px; }

/* ---- Màn 1: thư viện (lưới 6 mục) ---- */
.lvc-lib-intro{ font-size:.86rem; color:var(--mo); margin-bottom:14px; }
.lvc-lib-grid{ display:grid; grid-template-columns:repeat(auto-fill,minmax(230px,1fr)); gap:14px; }
.lvc-lib-card{ position:relative; background:#fff; border:1px solid var(--vien); border-radius:16px;
  padding:16px 16px 14px; cursor:pointer; text-align:left; transition:.15s; }
.lvc-lib-card:hover{ transform:translateY(-3px); box-shadow:0 10px 22px -12px rgba(150,110,30,.35); border-color:var(--mut); }
.lvc-lib-card .ic{ font-size:2.1rem; line-height:1; }
.lvc-lib-card .nm{ font-weight:800; font-size:1.02rem; margin-top:8px; color:var(--oliu-d); }
.lvc-lib-card .sb{ font-size:.82rem; color:var(--mo); margin-top:3px; line-height:1.4; }
.lvc-lib-card.soon{ opacity:.55; cursor:default; }
.lvc-lib-card.soon:hover{ transform:none; box-shadow:none; border-color:var(--vien); }
.lvc-lib-card .soon-badge{ position:absolute; top:12px; right:12px; font-size:.68rem; font-weight:800;
  background:var(--vien); color:var(--mo); padding:3px 9px; border-radius:999px; letter-spacing:.3px; }

/* ---- Màn 2: trang 32 nét ---- */
.lvc-bar{ display:flex; flex-wrap:wrap; gap:10px; align-items:center; margin:0 0 14px; }
.lvc-chip{ border:1px solid var(--vien); background:#fff; border-radius:999px; padding:8px 15px; font-size:.83rem;
  cursor:pointer; font-family:inherit; color:var(--muc); min-height:38px; }
.lvc-chip.on{ background:var(--oliu); border-color:var(--oliu); color:#fff; font-weight:700; }
.lvc-search{ flex:1; min-width:180px; border:1px solid var(--vien); border-radius:10px; padding:9px 12px;
  font-family:inherit; font-size:.9rem; background:#fff; color:var(--muc); }
.lvc-sw{ display:flex; gap:16px; flex-wrap:wrap; align-items:center; font-size:.82rem; color:var(--mo); width:100%; }
.lvc-sw label{ display:flex; gap:5px; align-items:center; cursor:pointer; }

.lvc-grid{ display:grid; grid-template-columns:repeat(auto-fill,minmax(168px,1fr)); gap:14px; }
.lvc-card{ background:#fff; border:1px solid var(--vien); border-radius:14px; padding:10px 10px 12px;
  cursor:pointer; transition:.15s; text-align:center; }
.lvc-card:hover{ transform:translateY(-3px); box-shadow:0 8px 20px rgba(46,42,36,.10); border-color:var(--mut); }
.lvc-card .no{ font-size:11px; color:var(--mut); font-weight:700; }
.lvc-card .vi{ font-size:15px; font-weight:700; margin-top:4px; }
.lvc-card .zh{ font-size:12px; color:var(--mo); }
.lvc-card svg{ display:block; margin:2px auto; }
.lvc-empty{ text-align:center; padding:30px 10px; color:var(--mo); }
.lvc-loading{ text-align:center; padding:40px 10px; color:var(--mo); font-size:.95rem; }
.lvc-retry{ background:#f2ede2; border:1px dashed var(--vien); border-radius:12px; padding:12px 8px; text-align:center; color:var(--mo); font-size:.78rem; }
.lvc-retry button{ margin-top:8px; min-height:38px; padding:7px 13px; border-radius:10px; border:1px solid var(--vien); background:#fff; cursor:pointer; font-family:inherit; color:var(--muc); }
.lvc-license{ margin-top:20px; font-size:.72rem; color:var(--mo); text-align:center; border-top:1px dashed var(--vien); padding-top:12px; }

/* ---- Lớp CSS BẮT BUỘC cho nét (dùng chung màn hình lẫn phiếu in, KHÔNG scope theo overlay) ---- */
.o-vien{ stroke:#E0BFB8; stroke-width:5; fill:#fff; }
.o-ke{ stroke:#E0BFB8; stroke-width:3; stroke-dasharray:26 20; }
.chu-mo{ fill:#EDE6D8; }
.net{ fill:#C0392B; }
.net-mo{ fill:#DCD4C6; }
.mui{ stroke:#FFF; stroke-width:11; fill:none; stroke-linecap:round; stroke-linejoin:round; opacity:.9; }
.mui-dau{ fill:#FFF; opacity:.95; }
.so-nen{ fill:#2F6FA8; }
.so-chu{ fill:#fff; font-size:66px; font-weight:700; font-family:Arial,sans-serif; text-anchor:middle; }

/* ---- Màn 3: hộp chi tiết (lớp phủ thứ hai, nổi trên lưới) ---- */
.lvc-det-ov{ position:fixed; inset:0; z-index:1450; background:rgba(46,42,36,.55); display:none;
  align-items:center; justify-content:center; padding:16px; }
.lvc-det-ov.open{ display:flex; }
.lvc-det{ background:var(--kem); border-radius:18px; max-width:900px; width:100%; max-height:92vh; overflow:auto; border:2px solid var(--vien); }
.lvc-det-head{ display:flex; justify-content:space-between; align-items:flex-start; padding:18px 22px 12px;
  border-bottom:1px solid var(--vien); background:#F7EFE0; position:sticky; top:0; z-index:1; }
.lvc-det-head h2{ margin:0; font-size:22px; }
.lvc-det-head .zh{ color:var(--mo); font-size:14px; margin-top:2px; }
.lvc-the-loai{ display:inline-block; font-size:11px; font-weight:800; color:var(--oliu-d); background:#e6ecd8;
  padding:2px 9px; border-radius:99px; vertical-align:middle; }
.lvc-det-x{ border:none; background:none; font-size:24px; cursor:pointer; color:var(--mo); line-height:1; flex:none; }
.lvc-det-body{ display:grid; grid-template-columns:270px 1fr; gap:22px; padding:20px 22px 10px; }
@media(max-width:700px){ .lvc-det-body{ grid-template-columns:1fr; } }
.lvc-det-left{ text-align:center; }
.lvc-det-small{ margin-top:10px; padding-top:10px; border-top:1px dashed var(--vien); }
.lvc-det-small .cap{ font-size:12px; color:var(--mo); margin-top:4px; }
.lvc-det-print{ margin-top:14px; min-height:46px; padding:11px 18px; border-radius:13px; border:none;
  background:linear-gradient(180deg,#8b9760,#6f7c46); color:#fff; font-weight:800; cursor:pointer; font-size:.92rem; width:100%; }
.lvc-sec{ margin-bottom:18px; }
.lvc-sec h3{ margin:0 0 8px; font-size:12px; letter-spacing:1.3px; color:var(--oliu); text-transform:uppercase; font-weight:700; }
ol.lvc-buoc{ margin:0; padding-left:0; list-style:none; counter-reset:b; }
ol.lvc-buoc li{ counter-increment:b; position:relative; padding:6px 0 6px 34px; font-size:15px; line-height:1.5; }
ol.lvc-buoc li::before{ content:counter(b); position:absolute; left:0; top:6px; width:22px; height:22px; border-radius:50%;
  background:var(--xanh); color:#fff; font-size:12px; font-weight:700; display:flex; align-items:center; justify-content:center; font-family:Arial,sans-serif; }
.lvc-vd-list{ display:flex; flex-wrap:wrap; gap:8px; }
.lvc-vd-list span{ background:#fff; border:1px solid var(--vien); border-radius:10px; padding:6px 12px; font-size:20px;
  line-height:1.2; font-family:"PingFang TC","Heiti TC","Noto Sans TC",serif; }
.lvc-luuy{ background:#fdf6e3; border-left:3px solid var(--mut); border-radius:10px; padding:10px 12px; font-size:14px; line-height:1.65; color:#5c5030; }
.lvc-det-foot{ display:flex; justify-content:space-between; padding:14px 22px 20px; border-top:1px solid var(--vien); gap:10px; }
.lvc-det-nav{ min-height:46px; padding:10px 18px; border-radius:12px; border:1px solid var(--vien); background:#fff;
  cursor:pointer; font-weight:700; color:var(--muc); font-family:inherit; font-size:.88rem; }
.lvc-det-nav:disabled{ opacity:.4; cursor:default; }

@media(max-width:700px){
  .lvc-sheet{ width:100%; border-radius:16px; }
  .lvc-grid{ grid-template-columns:repeat(auto-fill,minmax(140px,1fr)); gap:10px; }
  .lvc-lib-grid{ grid-template-columns:repeat(auto-fill,minmax(160px,1fr)); }
}

/* ---- Phiếu đồ nét (in A4) ---- */
#lvc-in-root{ display:none; }
/* Chỉ ẩn phần còn lại của trang KHI THỰC SỰ IN (không phải ngay lúc gắn lớp .lvc-dang-in) — nếu để
   ngoài @media print thì màn hình sẽ chớp trắng ~60ms trước khi hộp thoại in mở (hoặc trắng luôn nếu
   window.print() không mở được), giống lỗi đã tránh ở kho-chu-han.js. */
@media print{
  body.lvc-dang-in > *{ display:none !important; }
  body.lvc-dang-in > #lvc-in-root{ display:block !important; }
  body.lvc-dang-in{ margin:0 !important; padding:0 !important; background:#fff !important; }
  .khong-in{ display:none !important; }
  @page{ size:A4; margin:10mm; }
}
.lvc-phieu{ font-family:"Noto Serif",Cambria, Georgia,serif; color:#2E2A24; }
.lvc-phieu-dau{ text-align:center; margin-bottom:8px; }
.lvc-phieu-dau .th{ font-weight:800; font-size:1.05rem; color:#8a352a; }
.lvc-phieu-dau .ten{ font-size:.95rem; color:#4a4130; margin-top:3px; }
.lvc-phieu-buoc{ font-size:.85rem; color:#5c5030; margin:6px 0 10px; line-height:1.55; }
.lvc-phieu-hang{ font-size:.78rem; color:#8a7f6a; margin:2px 0 10px; }
.lvc-phieu-luoi{ display:grid; grid-template-columns:repeat(8,21mm); grid-auto-rows:21mm; gap:3mm; justify-content:center; }
.lvc-phieu-o{ width:21mm; height:21mm; }
.lvc-phieu-o svg{ width:100%; height:100%; display:block; }
.lvc-phieu-chan{ margin-top:12px; text-align:center; font-size:.7rem; color:#8a7f6a; }

/* ================== Màn 4/5/6: bút thuận · kết cấu · bộ thủ ================== */
.lvc-nguon{ background:#fff; border:1px solid var(--vien); border-left:4px solid var(--oliu); border-radius:14px;
  padding:11px 14px; font-size:.85rem; line-height:1.6; color:#5a5346; margin-bottom:14px; }
.lvc-nguon b{ color:var(--oliu-d); }
.lvc-goiy{ font-size:.82rem; color:var(--mo); margin:-4px 0 12px; }

/* ---- Thẻ quy tắc bút thuận ---- */
.lvc-bt-grid{ display:grid; grid-template-columns:repeat(auto-fill,minmax(290px,1fr)); gap:14px; }
.lvc-bt-card{ background:#fff; border:1px solid var(--vien); border-radius:16px; padding:14px 15px 12px;
  cursor:pointer; transition:.15s; }
.lvc-bt-card:hover{ transform:translateY(-3px); box-shadow:0 10px 22px -12px rgba(150,110,30,.35); border-color:var(--mut); }
.lvc-bt-card:active{ transform:translateY(0) scale(.99); }
.lvc-bt-card.vang{ background:linear-gradient(180deg,#fffdf6,#fff); border-color:#ecd9a8; }
.lvc-bt-top{ display:flex; align-items:flex-start; gap:11px; }
.lvc-bt-top .no{ flex:none; width:34px; height:34px; border-radius:12px; background:var(--oliu); color:#fff;
  font-weight:800; font-size:1rem; display:flex; align-items:center; justify-content:center; font-family:Arial,sans-serif; }
.lvc-bt-card.vang .lvc-bt-top .no{ background:linear-gradient(180deg,#d9ab48,#bd8a2b); }
.lvc-bt-top .vi{ font-weight:800; font-size:1rem; color:var(--oliu-d); line-height:1.35; }
.lvc-bt-top .zh{ font-size:.8rem; color:var(--mo); margin-top:2px; font-family:"PingFang TC","Noto Sans TC",serif; }
.lvc-bt-top .sao{ margin-left:auto; font-size:.95rem; flex:none; }
.lvc-bt-card .mo{ font-size:.85rem; line-height:1.6; color:#5a5346; margin-top:9px; }
.lvc-bt-vd{ display:flex; align-items:center; gap:7px; flex-wrap:wrap; margin-top:11px; padding-top:10px;
  border-top:1px dashed var(--vien); }
.lvc-bt-vd b{ font-size:22px; line-height:1.1; font-weight:600; color:var(--muc);
  font-family:"PingFang TC","Heiti TC","Noto Sans TC",serif; background:#f7f2e6; border:1px solid var(--vien);
  border-radius:9px; padding:3px 9px; }
.lvc-bt-vd .xem{ margin-left:auto; font-size:.76rem; font-weight:700; color:var(--oliu); }

/* ---- Khung chạy nét ---- */
.lvc-chay-o{ display:flex; justify-content:center; }
.lvc-chay-o svg{ display:block; }
.net-den{ fill:#2E2A24; }
.so-nen.moi{ fill:var(--do); }
.lvc-chay-dai{ display:flex; flex-wrap:wrap; gap:5px; justify-content:center; margin-top:10px; }
.lvc-chay-dai i{ width:22px; height:22px; border-radius:7px; background:#f0eadd; border:1px solid var(--vien);
  color:var(--mo); font-size:11px; font-style:normal; font-weight:700; display:flex; align-items:center;
  justify-content:center; font-family:Arial,sans-serif; transition:.15s; }
.lvc-chay-dai i.on{ background:var(--oliu); border-color:var(--oliu); color:#fff; }
.lvc-chay-dieu{ display:flex; align-items:center; justify-content:center; flex-wrap:wrap; gap:8px; margin-top:12px; }
.lvc-chay-nut{ min-width:48px; min-height:44px; padding:0 14px; border-radius:14px; border:1px solid var(--vien);
  background:#fff; font-family:inherit; font-size:1rem; font-weight:700; color:var(--muc); cursor:pointer; }
.lvc-chay-nut.chinh{ background:linear-gradient(180deg,#8b9760,#6f7c46); border:none; color:#fff; font-size:.92rem; padding:0 18px; }
.lvc-chay-nut:active{ transform:scale(.96); }
.lvc-chay-nut:disabled{ opacity:.35; cursor:default; }
.lvc-chay-dem{ font-size:.8rem; color:var(--mo); font-weight:700; }
.lvc-chay-sw{ display:flex; gap:5px; align-items:center; font-size:.8rem; color:var(--mo); cursor:pointer; width:100%; justify-content:center; }
.lvc-chon-chu{ display:flex; gap:8px; justify-content:center; flex-wrap:wrap; margin-top:14px; }
.lvc-chu-nut{ min-width:52px; min-height:52px; border-radius:15px; border:1px solid var(--vien); background:#fff;
  font-size:25px; line-height:1; cursor:pointer; color:var(--muc); font-family:"PingFang TC","Heiti TC","Noto Sans TC",serif; }
.lvc-chu-nut.on{ background:var(--oliu); border-color:var(--oliu); color:#fff; }
.lvc-chu-nut:active{ transform:scale(.95); }
.lvc-det-left > .cap{ font-size:12px; color:var(--mo); margin-top:8px; }
.lvc-mo-lon{ font-size:15px; line-height:1.7; color:#3f3a31; }
.lvc-han{ font-size:17px; line-height:1.6; color:var(--oliu-d); font-family:"PingFang TC","Heiti TC","Noto Sans TC",serif;
  background:#fff; border:1px solid var(--vien); border-radius:12px; padding:9px 13px; }

/* ---- Thẻ kết cấu ---- */
.lvc-kc-grid{ display:grid; grid-template-columns:repeat(auto-fill,minmax(268px,1fr)); gap:14px; }
.lvc-kc-card{ background:#fff; border:1px solid var(--vien); border-radius:16px; padding:14px 15px 12px; cursor:pointer; transition:.15s; }
.lvc-kc-card:hover{ transform:translateY(-3px); box-shadow:0 10px 22px -12px rgba(150,110,30,.35); border-color:var(--mut); }
.lvc-kc-card:active{ transform:translateY(0) scale(.99); }
.lvc-kc-top{ display:flex; align-items:center; gap:13px; }
.lvc-kc-tt .vi{ font-weight:800; font-size:1.02rem; color:var(--oliu-d); }
.lvc-kc-tt .zh{ font-size:.84rem; color:var(--mo); margin-top:2px; font-family:"PingFang TC","Noto Sans TC",serif; }
.lvc-kc-tt .u{ font-size:.72rem; color:#a79b86; margin-top:3px; font-family:Arial,sans-serif; }
.lvc-sodo{ display:block; flex:none; }
.sd-o{ fill:#fff; stroke:#E0BFB8; stroke-width:1.6; }
.sd-ke{ stroke:#EBD9D3; stroke-width:1; stroke-dasharray:4 3; }
.sd-b{ fill:#cbd6ad; stroke:#8d9c66; stroke-width:1.4; opacity:.9; }
.sd-b2{ fill:#f0d9a6; stroke:#c99f45; }
.sd-b3{ fill:#e6c6bd; stroke:#c08175; }
.lvc-kc-vd{ display:flex; flex-direction:column; gap:5px; margin-top:11px; padding-top:10px; border-top:1px dashed var(--vien); }
.lvc-kc-vd .ct{ display:flex; align-items:baseline; gap:8px; }
.lvc-kc-vd .ct b{ font-size:21px; font-weight:600; color:var(--muc); font-family:"PingFang TC","Heiti TC","Noto Sans TC",serif; }
.lvc-kc-vd .ct i{ font-style:normal; font-size:.84rem; color:var(--mo); font-family:"PingFang TC","Noto Sans TC",serif; }
.lvc-tach{ display:flex; flex-direction:column; gap:8px; }
.lvc-tach-hang{ display:flex; align-items:center; gap:9px; background:#fff; border:1px solid var(--vien);
  border-radius:12px; padding:8px 12px; flex-wrap:wrap; }
.lvc-tach-hang .chu{ font-size:27px; font-weight:600; line-height:1.1; font-family:"PingFang TC","Heiti TC","Noto Sans TC",serif; }
.lvc-tach-hang .bang,.lvc-tach-hang .cong{ color:var(--mo); font-size:15px; }
.lvc-tach-hang .phan{ font-size:22px; background:#f4f1e5; border:1px solid var(--vien); border-radius:9px;
  padding:2px 9px; font-family:"PingFang TC","Heiti TC","Noto Sans TC",serif; }

/* ---- 214 bộ thủ (nhúng) ---- */
.lvc-bothu-khung{ position:relative; border:1px solid var(--vien); border-radius:16px; overflow:hidden;
  background:#fbf7ef; box-shadow:0 8px 22px -16px rgba(60,45,20,.5); }
.lvc-bothu{ display:block; width:100%; height:min(74vh,860px); border:0; background:#fbf7ef; }
.lvc-bothu-cho{ position:absolute; inset:0; display:flex; align-items:center; justify-content:center;
  color:var(--mo); font-size:.9rem; background:#fbf7ef; }
.lvc-bothu-lui{ background:#fdf6e3; border:1px dashed var(--mut); border-radius:16px; padding:18px;
  text-align:center; color:#5c5030; font-size:.9rem; line-height:1.6; }
.lvc-bothu-lui .lvc-det-print{ max-width:320px; margin:12px auto 0; }
.lvc-bothu-hang{ display:flex; justify-content:center; margin-top:12px; }
.lvc-bothu-hang .lvc-chip{ min-height:44px; font-weight:700; }

@media(max-width:700px){
  .lvc-bt-grid,.lvc-kc-grid{ grid-template-columns:1fr; }
  .lvc-bothu{ height:min(68vh,620px); }
}
.sd-khung{ fill:none; stroke:#7d8d59; stroke-width:8.5; stroke-linecap:round; stroke-linejoin:round; }

/* ================== Màn 7: phiếu đồ chữ theo bài ================== */
.lvc-phieu-grid{ display:grid; grid-template-columns:repeat(auto-fill,minmax(270px,1fr)); gap:14px; }
.lvc-phieu-card{ background:#fff; border:1px solid var(--vien); border-radius:16px; padding:14px 15px 13px;
  display:flex; flex-direction:column; }
.lvc-phieu-top{ display:flex; align-items:center; gap:10px; }
.lvc-phieu-top .bai{ font-weight:800; font-size:1.04rem; color:var(--oliu-d); flex:1; }
.lvc-phieu-top .loai{ font-size:.7rem; font-weight:800; color:var(--mo); background:#f4f0e4;
  border:1px solid var(--vien); border-radius:999px; padding:3px 9px; white-space:nowrap; }
.lvc-phieu-card .ten{ font-size:.88rem; color:#5a5346; margin-top:6px; line-height:1.5; }
.lvc-phieu-chu{ display:flex; flex-wrap:wrap; gap:6px; margin-top:10px; }
.lvc-phieu-chu b{ font-size:20px; font-weight:600; background:#f7f2e6; border:1px solid var(--vien);
  border-radius:8px; padding:2px 8px; font-family:"PingFang TC","Heiti TC","Noto Sans TC",serif; }
.lvc-phieu-card .ghi{ font-size:.8rem; color:var(--mo); margin-top:9px; font-style:italic; }
.lvc-phieu-day{ margin-top:auto; padding-top:13px; }
.lvc-phieu-nut{ display:block; text-align:center; text-decoration:none; min-height:48px;
  line-height:48px; border-radius:14px; background:linear-gradient(180deg,#8b9760,#6f7c46); color:#fff;
  font-weight:800; font-size:.92rem; }
.lvc-phieu-nut:active{ transform:scale(.97); }

/* Dải NỔI BẬT ở đầu mục: phiếu tổng hợp dùng cho CẢ khoá (pham="khoa"). Nền đặc + viền mứt vàng +
   bóng đổ rõ để tách hẳn khỏi lưới phiếu từng bài phía dưới (nền trang là kem phẳng nên hiệu ứng
   kính mờ gần như vô hình — xem "Bài học cốt lõi · Giao diện" trong CLAUDE.md). */
.lvc-phieu-khoa{ background:linear-gradient(180deg,#FFFBF0,#F8F0DC); border:1.5px solid var(--mut);
  border-radius:18px; padding:16px 17px 15px; margin-bottom:16px;
  box-shadow:0 10px 24px -14px rgba(120,90,20,.55), 0 2px 0 rgba(255,255,255,.7) inset; }
.lvc-phieu-khoa-top{ display:flex; align-items:center; gap:10px; flex-wrap:wrap; }
.lvc-phieu-khoa-top .bai{ font-weight:800; font-size:1.1rem; color:var(--oliu-d); flex:1; min-width:150px; }
.lvc-phieu-khoa-top .loai{ font-size:.7rem; font-weight:800; color:#8a6a1e; background:#fff6e0;
  border:1px solid var(--mut); border-radius:999px; padding:3px 9px; white-space:nowrap; }
.lvc-phieu-khoa .ten{ font-size:.9rem; color:#5a5346; margin-top:6px; line-height:1.5; }
.lvc-phieu-khoa .ghi{ font-size:.8rem; color:var(--mo); margin-top:8px; font-style:italic; }
.lvc-phieu-khoa .lvc-phieu-nut{ margin-top:13px; }
/* Trên máy tính, nút của thẻ cả khoá không kéo hết bề ngang (thẻ rất rộng, nút dài trông nặng nề). */
@media (min-width:640px){ .lvc-phieu-khoa .lvc-phieu-nut{ max-width:360px; } }
.lvc-phieu-nhan{ font-weight:800; font-size:.95rem; color:var(--oliu-d); margin:6px 0 10px; }

/* ================== Màn 8: lỗi viết thường gặp ================== */
.lvc-loi-grid{ display:grid; grid-template-columns:repeat(auto-fill,minmax(300px,1fr)); gap:14px; }
.lvc-loi-card{ background:#fff; border:1px solid var(--vien); border-radius:16px; padding:14px 15px 12px;
  cursor:pointer; transition:.15s; border-left:4px solid #e0b4a8; }
.lvc-loi-card:hover{ transform:translateY(-3px); box-shadow:0 10px 22px -12px rgba(150,110,30,.35); border-color:var(--mut); border-left-color:var(--do); }
.lvc-loi-card:active{ transform:translateY(0) scale(.99); }
.lvc-loi-top{ display:flex; align-items:flex-start; gap:10px; }
.lvc-loi-top .ten{ font-weight:800; font-size:1rem; color:var(--muc); flex:1; line-height:1.35; }
.lvc-loi-top .qt{ flex:none; font-size:.68rem; font-weight:800; color:var(--oliu-d); background:#e9eeda;
  border-radius:999px; padding:3px 8px; white-space:nowrap; }
.lvc-loi-dong{ display:flex; gap:8px; align-items:flex-start; margin-top:9px; font-size:.85rem; line-height:1.55; }
.lvc-loi-dong .ic{ flex:none; width:19px; height:19px; border-radius:50%; color:#fff; font-size:11px;
  font-weight:800; display:flex; align-items:center; justify-content:center; margin-top:2px; }
.lvc-loi-dong.sai .ic{ background:var(--do); }
.lvc-loi-dong.dung .ic{ background:#4a8a5c; }
.lvc-loi-dong.sai{ color:#8c4034; }
.lvc-loi-dong.dung{ color:#3c6b4a; }
.lvc-loi-chan{ display:flex; align-items:center; gap:8px; margin-top:11px; padding-top:9px; border-top:1px dashed var(--vien); }
.lvc-loi-chan .nhom{ font-size:.74rem; color:var(--mo); flex:1; }
.lvc-loi-chan .xem{ font-size:.76rem; font-weight:700; color:var(--oliu); }
.lvc-hop-sai{ background:#fdf0ed; border-left:3px solid var(--do); border-radius:10px; padding:10px 12px;
  font-size:14.5px; line-height:1.65; color:#7d3b30; }
.lvc-hop-dung{ background:#eef6ef; border-left:3px solid #4a8a5c; border-radius:10px; padding:10px 12px;
  font-size:14.5px; line-height:1.65; color:#31613f; }
.lvc-cap-grid{ display:flex; flex-direction:column; gap:8px; }
.lvc-cap-o{ display:flex; align-items:center; justify-content:center; gap:10px; background:#fff;
  border:1px solid var(--vien); border-radius:12px; padding:8px 10px; }
.lvc-cap-o b{ font-size:28px; line-height:1.1; font-weight:600; font-family:"PingFang TC","Heiti TC","Noto Sans TC",serif; }
.lvc-cap-o b.dung{ color:#31613f; }
.lvc-cap-o b.sai{ color:#b0483a; text-decoration:line-through; opacity:.75; }
.lvc-cap-o b.khac{ color:var(--muc); }
.lvc-cap-o .mui{ font-size:.72rem; color:var(--mo); font-weight:700; }

@media(max-width:700px){
  .lvc-phieu-grid,.lvc-loi-grid{ grid-template-columns:1fr; }
}
.lvc-loi-ng{ margin-top:7px; font-size:.72rem; color:#a2967d; }
.lvc-ng-box{ font-size:.85rem; line-height:1.6; color:#5a5346; background:#fff; border:1px solid var(--vien);
  border-radius:10px; padding:9px 12px; }
.lvc-nguon-day{ margin-top:22px; border-top:1px dashed var(--vien); padding-top:14px; }
.lvc-nguon-day .tieu{ font-size:.74rem; font-weight:800; letter-spacing:1px; text-transform:uppercase;
  color:var(--oliu); margin-bottom:6px; }
.lvc-nguon-day ol{ margin:0; padding-left:20px; }
.lvc-nguon-day li{ font-size:.76rem; color:var(--mo); line-height:1.65; margin-bottom:4px; }