/* Trang Học tiếng Việt khu /zh/ (/zh/yue-yu/), làm lại 08/11/2026: 5 phần rõ ràng + lộ trình lật trang */
.yy { --b: #024AC2; --bd: #0B3D91; --bs: #EEF3FB; --ln: #D9E2F2; --mu: #5b6475; }
.yy .wrap { max-width: 1120px; }
.yy-nav { position: sticky; top: 0; z-index: 30; background: rgba(255,255,255,.97); border-bottom: 1px solid var(--ln); }
.yy-nav .wrap { display: flex; gap: 6px; overflow-x: auto; padding: 8px 20px; scrollbar-width: none; }
.yy-nav .wrap::-webkit-scrollbar { display: none; }
.yy-nav a { flex: 0 0 auto; padding: 7px 14px; border-radius: 999px; font-weight: 700; font-size: 14.5px; color: var(--bd) !important; text-decoration: none; border: 1px solid var(--ln); background: #fff; white-space: nowrap; }
.yy-nav a:hover, .yy-nav a.on { background: var(--b); color: #fff !important; border-color: var(--b); }
.yy-sec { padding: 30px 0 8px; scroll-margin-top: 70px; }
.yy-sec + .yy-sec { border-top: 1px solid var(--ln); }
.yy-h2 { display: flex; align-items: baseline; gap: 12px; margin: 0 0 6px; font-size: 25px; color: #1f2937; }
.yy-h2 .no { flex: 0 0 auto; display: inline-grid; place-items: center; width: 38px; height: 38px; border-radius: 10px; background: var(--b); color: #fff; font-size: 19px; }
.yy-lead { margin: 0 0 18px; color: var(--mu); font-size: 15.5px; line-height: 1.7; max-width: 820px; }
.yy-h3 { margin: 22px 0 10px; font-size: 18px; color: var(--bd); }
.yy-h3 small { font-weight: 600; color: var(--mu); font-size: 14px; margin-left: 6px; }
.yy-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); }
.yy-card { display: flex; flex-direction: column; gap: 6px; padding: 16px; border: 1px solid var(--ln); border-radius: 12px; background: #fff; color: inherit !important; text-decoration: none; min-width: 0; }
a.yy-card:hover { border-color: var(--b); box-shadow: 0 4px 16px rgba(2,74,194,.1); }
.yy-card h4 { margin: 0; font-size: 17px; color: #1f2937; line-height: 1.4; }
.yy-card p { margin: 0; color: var(--mu); font-size: 14.5px; line-height: 1.6; }
.yy-card .go { margin-top: auto; padding-top: 8px; font-weight: 800; color: var(--b); font-size: 14.5px; }
.yy-ic { font-size: 26px; line-height: 1; }
.yy-tag { align-self: flex-start; font-size: 12.5px; font-weight: 800; padding: 2px 9px; border-radius: 999px; background: var(--bs); color: var(--bd); }
.yy-tag.part { background: #FFF4E0; color: #8a5a00; }
.yy-tag.soon { background: #F1F2F4; color: #666; }
.yy-bar { height: 6px; border-radius: 6px; background: var(--bs); overflow: hidden; margin-top: 4px; }
.yy-bar i { display: block; height: 100%; width: 0; background: var(--b); border-radius: 6px; }
.yy-prog { font-size: 13px; color: var(--mu); }
.yy-method { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); margin-bottom: 18px; }
.yy-method div { padding: 14px; border-radius: 12px; background: var(--bs); }
.yy-method b { display: block; color: var(--bd); margin-bottom: 4px; font-size: 15.5px; }
.yy-method span { color: #374151; font-size: 14.5px; line-height: 1.6; }
.yy-feature { display: grid; gap: 16px; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); margin-bottom: 8px; align-items: start; }
.yy-cats { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.yy-stages { list-style: none; margin: 14px 0 0; padding: 0; display: grid; gap: 8px; }
.yy-stages li { padding: 10px 12px; border-radius: 10px; background: var(--bs); font-size: 14.5px; line-height: 1.55; }
.yy-stages li b { color: var(--bd); margin-right: 6px; }
.yy-box { padding: 16px; border: 1px solid var(--ln); border-radius: 12px; background: #fff; min-width: 0; }
.yy-box h4 { margin: 4px 0 6px; font-size: 17.5px; color: #1f2937; }
.yy-box p, .yy-box li { color: #374151; font-size: 14.5px; line-height: 1.65; }
.yy-box ul { margin: 0 0 10px; padding-left: 20px; }
.yy-box video { width: 100%; aspect-ratio: 16/9; border-radius: 10px; background: #000; display: block; margin-bottom: 10px; }
.yy-teacher { display: flex; gap: 14px; align-items: flex-start; }
.yy-teacher img { width: 84px; height: 84px; border-radius: 50%; object-fit: cover; flex: 0 0 auto; border: 3px solid var(--bs); }
.yy-btns { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.yy-btns .zh-btn { font-size: 14.5px; padding: 8px 14px; }
.yy-sub { padding: 16px; border-radius: 12px; border: 1px dashed var(--ln); background: #fafbfd; }
.yy-sub + .yy-sub { margin-top: 12px; }
.yy-sub h4 { margin: 0 0 6px; font-size: 17px; color: #1f2937; }
.yy-sub p { margin: 0; color: var(--mu); font-size: 14.5px; line-height: 1.65; }
.yy-sub.full { border-style: solid; background: #fff; }
.yy-steps { counter-reset: s; list-style: none; margin: 10px 0 0; padding: 0; display: grid; gap: 8px; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.yy-steps li { counter-increment: s; padding: 10px 12px 10px 42px; position: relative; border-radius: 10px; background: var(--bs); font-size: 14.5px; color: #374151; line-height: 1.5; }
.yy-steps li::before { content: counter(s); position: absolute; left: 12px; top: 10px; width: 22px; height: 22px; border-radius: 50%; background: var(--b); color: #fff; font-weight: 800; font-size: 13px; display: grid; place-items: center; }
.yy-contact { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; margin-top: 14px; padding: 14px; border-radius: 12px; background: var(--bs); }
.yy-contact img { width: 92px; height: 92px; border-radius: 8px; background: #fff; }
.yy-contact p { margin: 0; font-size: 14.5px; color: #374151; line-height: 1.6; }
.yy-partner { display: flex; gap: 14px; flex-wrap: wrap; align-items: flex-start; }
.yy-partner .tx { flex: 1 1 280px; min-width: 0; }
.yy-note { font-size: 13px; color: var(--mu); margin-top: 6px; }
@media (max-width: 960px) { .yy-cats { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px) { .yy-cats { grid-template-columns: 1fr; } }
@media (max-width: 760px) {
  .yy-feature { grid-template-columns: 1fr; }
  .yy-h2 { font-size: 21px; }
  .yy-h2 .no { width: 32px; height: 32px; font-size: 16px; }
  .yy-sec { padding: 22px 0 4px; }
}

/* ===== Trang lộ trình lật trang (lo-trinh.html) ===== */
.lt-top { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; padding: 14px 0 6px; }
.lt-top h1 { margin: 0; font-size: 22px; color: #1f2937; flex: 1 1 260px; }
.lt-head { position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,.97); padding: 8px 0; border-bottom: 1px solid var(--ln); }
.lt-headrow { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--mu); }
.lt-headrow .yy-bar { flex: 1; margin: 0; }
.lt-list { margin-left: auto; }
.lt-page { min-height: 320px; padding: 20px 0 10px; }
.lt-page h2 { margin: 0 0 4px; font-size: 21px; color: #1f2937; }
.lt-kicker { font-size: 13.5px; font-weight: 800; color: var(--b); margin-bottom: 4px; }
.lt-goal { color: var(--mu); margin: 0 0 14px; font-size: 15px; line-height: 1.6; }
.lt-points { margin: 0; padding-left: 0; list-style: none; display: grid; gap: 10px; }
.lt-points li { padding: 12px 14px; border-radius: 10px; background: var(--bs); line-height: 1.7; font-size: 15.5px; color: #1f2937; }
.lt-words { display: grid; gap: 10px; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); }
.lt-w { padding: 12px; border: 1px solid var(--ln); border-radius: 10px; background: #fff; display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.lt-w b { font-size: 19px; color: var(--bd); }
.lt-w em { font-style: normal; font-size: 13px; color: var(--mu); line-height: 1.5; }
.lt-w span.v-zh { font-size: 15px; color: #1f2937; }
.lt-say { align-self: flex-start; margin-top: 4px; border: 1px solid var(--ln); background: #fff; color: var(--bd); border-radius: 999px; padding: 4px 12px; font-weight: 700; font-size: 13.5px; cursor: pointer; }
.lt-say:hover, .lt-say.on { background: var(--b); color: #fff; border-color: var(--b); }
.lt-tools { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 12px; }
.lt-tools button { border: 1px solid var(--ln); background: #fff; border-radius: 999px; padding: 5px 12px; font-size: 13.5px; font-weight: 700; color: var(--bd); cursor: pointer; }
.lt-tools button.on { background: var(--b); color: #fff; border-color: var(--b); }
.lt-hide-vi .lt-w b, .lt-hide-zh .lt-w .v-zh { filter: blur(6px); cursor: pointer; }
.lt-hide-vi .lt-w b.show, .lt-hide-zh .lt-w .v-zh.show { filter: none; }
.lt-q { padding: 12px 14px; border: 1px solid var(--ln); border-radius: 10px; margin-bottom: 10px; background: #fff; }
.lt-q .st { font-weight: 700; margin-bottom: 8px; color: #1f2937; }
.lt-q .op { display: flex; flex-wrap: wrap; gap: 8px; }
.lt-q .op button { border: 1px solid var(--ln); background: #fff; border-radius: 8px; padding: 7px 12px; font-size: 15px; cursor: pointer; }
.lt-q .op button.ok { background: #E7F6EC; border-color: #2e9d55; color: #1d6b39; }
.lt-q .op button.no { background: #FDECEC; border-color: #d24b4b; color: #9b2c2c; }
.lt-score { font-weight: 800; color: var(--bd); margin: 6px 0 10px; }
.lt-nav { display: flex; justify-content: space-between; gap: 10px; padding: 14px 0 30px; border-top: 1px solid var(--ln); margin-top: 18px; }
.lt-nav .zh-btn { min-width: 120px; text-align: center; }
.lt-nav .zh-btn[disabled] { opacity: .4; pointer-events: none; }
.lt-drawer { display: none; position: fixed; inset: 0; z-index: 60; background: rgba(15,23,42,.35); }
.lt-drawer.on { display: block; }
.lt-drawer .pn { position: absolute; right: 0; top: 0; bottom: 0; width: min(380px, 92vw); background: #fff; overflow-y: auto; padding: 16px; box-shadow: -6px 0 24px rgba(0,0,0,.12); }
.lt-drawer ol { margin: 10px 0 0; padding-left: 22px; }
.lt-drawer li { padding: 6px 0; font-size: 14.5px; }
.lt-drawer li a { color: #374151 !important; text-decoration: none; }
.lt-drawer li.cur a { color: var(--b) !important; font-weight: 800; }
.lt-drawer li.dn a::after { content: " ✓"; color: #2e9d55; }
@media (max-width: 760px) { .lt-page h2 { font-size: 19px; } .lt-nav .zh-btn { min-width: 0; flex: 1; } }