/* ══════════════════════════════════════════════════════════════════
   TRÍ LỮ · MÀN DẠY CHIA NHỎ — Cinema × Atlas 3.0 (09/08/2026)
   Nội dung ≥15px · phụ ≥13px · nhãn ≥11px · Nhật ≥18px · chạm ≥44px
   ══════════════════════════════════════════════════════════════════ */
.tl-day{
  --day-bg:#f3ece2;--day-surface:#fffdf9;--day-surface-2:#f8f0e4;
  --day-ink:#1d2533;--day-ink-2:#4d5360;--day-muted:#746d60;
  --day-line:rgba(126,97,48,.24);--day-line-soft:rgba(126,97,48,.13);
  --day-son:#b44833;--day-son-strong:#963723;--day-gold:#8d6424;
  --day-gold-soft:#d3b779;--day-green:#2f7457;--day-focus:#166a72;
  --day-display:"Playfair Display","Be Vietnam Pro",Georgia,serif;
  --day-sans:"Be Vietnam Pro",system-ui,-apple-system,sans-serif;
  --day-jp:"Noto Serif JP",serif;
  --day-shadow:0 18px 45px rgba(55,39,21,.10);
  color:var(--day-ink);font-family:var(--day-sans);position:relative;background:transparent;scroll-margin-top:136px;
  -webkit-text-size-adjust:100%
}
html[data-mode="dark"] .tl-day{
  --day-bg:#0b1322;--day-surface:#14243a;--day-surface-2:#0d1b2d;
  --day-ink:#f3ecde;--day-ink-2:#d8d0c1;--day-muted:#b8af9e;
  --day-line:rgba(211,183,121,.32);--day-line-soft:rgba(211,183,121,.16);
  --day-son:#db846c;--day-son-strong:#ef9b82;--day-gold:#d3b779;
  --day-gold-soft:#e1c98f;--day-green:#83caa4;--day-focus:#75d6df;
  --day-shadow:0 22px 56px rgba(0,0,0,.30)
}
html[data-mode="dark"] .tl-day .tl-day__tiep{color:#14243a}
.tl-day *{box-sizing:border-box}
.tl-day [hidden]{display:none!important}
.tl-day button,.tl-day summary{font:inherit}
.tl-day button:focus-visible,.tl-day summary:focus-visible,.tl-day__t:focus-visible{
  outline:3px solid var(--day-focus);outline-offset:3px
}
.tl-day ruby{ruby-position:over}
.tl-day ruby rt{font-size:11px;line-height:1.05;color:var(--day-muted);font-family:var(--day-sans);font-weight:500}
.tl-day [lang="ja"]{font-family:var(--day-jp)}

.tl-day__in{width:min(100%,760px);margin:0 auto;padding:12px 14px 22px}
.tl-day__man{overflow:hidden;border:1px solid var(--day-line);background:var(--day-surface);
  box-shadow:var(--day-shadow);border-radius:26px}

/* Tuyến Atlas: phần đã qua, phần hiện tại và phần phía trước. */
.tl-day__doan{display:flex;gap:8px;padding:20px 24px 0}
.tl-day__doan i{flex:1;height:4px;background:var(--day-line-soft);border:1px solid var(--day-line);border-radius:999px;transition:background .18s,border-color .18s}
.tl-day__doan i.qua{background:var(--day-gold-soft);border-color:var(--day-gold-soft)}
.tl-day__doan i.nay{background:var(--day-son);border-color:var(--day-son);box-shadow:0 0 16px color-mix(in srgb,var(--day-son) 44%,transparent)}

.tl-day__dau{padding:28px 26px 0}
.tl-day__so{font:700 11px/1 var(--day-sans);letter-spacing:.16em;text-transform:uppercase;color:var(--day-son)}
.tl-day__t{max-width:650px;margin:10px 0 0;color:var(--day-ink);font:400 clamp(26px,5vw,32px)/1.14 var(--day-display);letter-spacing:-.018em;text-wrap:balance}
.tl-day__mau{width:max-content;max-width:100%;margin:14px 0 0;padding:7px 12px;border-left:2px solid var(--day-gold);
  color:var(--day-gold);background:var(--day-surface-2);font:500 clamp(18px,3.4vw,22px)/1.45 var(--day-jp);overflow-wrap:normal;line-break:strict;text-wrap:pretty}

.tl-day__g{margin:18px 26px 0;color:var(--day-ink-2);font:400 16px/1.62 var(--day-sans)}
.tl-day__g b{font-weight:700;color:var(--day-son-strong)}

.tl-day__ct{margin:20px 26px 0;padding:18px 20px;border:1px solid var(--day-line-soft);border-left:3px solid var(--day-gold);
  background:var(--day-surface-2)}
.tl-day__ct-label{display:block;margin-bottom:10px;color:var(--day-gold);font:700 11px/1 var(--day-sans);letter-spacing:.16em;text-transform:uppercase}
.tl-day__ct b{display:block;color:var(--day-ink);font:500 clamp(18px,3.2vw,20.5px)/1.5 var(--day-sans);overflow-wrap:normal;word-break:normal;text-wrap:pretty}
.tl-day__ct b em{font-style:normal;font-weight:700;color:var(--day-son)}
.tl-day__ct small{display:block;margin-top:8px;color:var(--day-muted);font:500 13.5px/1.55 var(--day-sans)}

.tl-day__vdlb{display:flex;align-items:center;gap:12px;margin:26px 26px 12px}
.tl-day__vdlb span{color:var(--day-muted);font:700 11px/1 var(--day-sans);letter-spacing:.16em;text-transform:uppercase}
.tl-day__vdlb i{flex:1;height:1px;background:var(--day-line-soft)}
.tl-day__vd{margin:0 26px}
.tl-day__v{display:grid;grid-template-columns:minmax(0,1fr);align-items:center;gap:12px;padding:16px 0;border-top:1px solid var(--day-line-soft)}
.tl-day__v:first-child{border-top:0}
.tl-day__v--chinh{padding:20px;border:1px solid var(--day-line);background:color-mix(in srgb,var(--day-surface) 88%,var(--day-bg));border-radius:20px}
.tl-day__jp{grid-column:1/-1;grid-row:1;color:var(--day-ink);font:500 clamp(21px,3.8vw,24px)/1.7 var(--day-jp);overflow-wrap:normal;word-break:normal;line-break:strict;text-wrap:pretty}
.tl-day__jp b,.tl-day__jp .target{color:var(--day-son-strong);font-weight:700}
.tl-day__v-actions{grid-column:1/-1;grid-row:2;display:flex;align-items:center;gap:10px}
.tl-day__vi{grid-column:1/-1;grid-row:3;color:var(--day-muted);font:500 14px/1.55 var(--day-sans)}
.tl-day__nghia{min-height:44px;padding:9px 14px;border:1px solid var(--day-line);border-radius:12px;background:var(--day-surface);color:var(--day-son-strong);font:700 13.5px var(--day-sans);cursor:pointer}
.tl-day__nghe{align-self:center;width:44px;height:44px;padding:0;border:1px solid var(--day-line);border-radius:50%;
  display:grid;place-items:center;background:var(--day-surface);color:var(--day-son);cursor:pointer;font-size:16px;transition:transform .16s,border-color .16s,background .16s}
.tl-day__nghe:hover{border-color:var(--day-son)}
.tl-day__nghe:active{transform:scale(.92)}
.tl-day__nghe.dang-tai,.tl-day__nghe.dang-phat{border-color:var(--day-son);background:color-mix(in srgb,var(--day-son) 10%,var(--day-surface))}
.tl-day__nghe.dang-phat span{animation:tl-day-nghe 1s ease-in-out infinite}
@keyframes tl-day-nghe{50%{transform:scale(1.18);opacity:.62}}

.tl-day__them{margin:12px 26px 0;border-top:1px solid var(--day-line-soft)}
.tl-day__them summary{min-height:44px;padding:12px 0;display:flex;align-items:center;justify-content:space-between;gap:12px;
  color:var(--day-son-strong);font-size:13.5px;font-weight:700;cursor:pointer;list-style:none}
.tl-day__them summary::-webkit-details-marker{display:none}
.tl-day__them summary::after{content:"＋";font-family:var(--day-sans);font-size:18px;font-weight:400}
.tl-day__them[open] summary::after{content:"−"}
.tl-day__vd--them{margin:0}

.tl-day__bang{margin:22px 26px 0;overflow-x:auto;border:1px solid var(--day-line);background:var(--day-surface-2);-webkit-overflow-scrolling:touch}
.tl-day__bang table{width:100%;min-width:520px;border-collapse:collapse;table-layout:auto}
.tl-day__bang caption{padding:14px 15px;text-align:left;color:var(--day-gold);font:700 11px/1.4 var(--day-sans);letter-spacing:.14em;text-transform:uppercase}
.tl-day__bang th,.tl-day__bang td{padding:12px 14px;border-top:1px solid var(--day-line-soft);text-align:left;vertical-align:top}
.tl-day__bang thead th{color:var(--day-muted);font:700 11px/1.35 var(--day-sans);letter-spacing:.08em;text-transform:uppercase}
.tl-day__bang tbody th{color:var(--day-ink);font:700 14px/1.5 var(--day-sans)}
.tl-day__bang td{color:var(--day-ink-2);font:500 14px/1.5 var(--day-sans)}
.tl-day__bang td [lang="ja"],.tl-day__bang th [lang="ja"]{font-family:var(--day-jp)}
.tl-day__bang tr.nhom23>*{background:color-mix(in srgb,var(--day-gold) 8%,transparent)}
.tl-day__bang em{font-style:normal;color:var(--day-son-strong);font-weight:700}

.tl-day__canh{margin:16px 26px 0;padding:15px 17px;border:1px solid var(--day-line);border-left:3px solid var(--day-son);background:color-mix(in srgb,var(--day-son) 6%,var(--day-surface))}
.tl-day__canh b{display:block;margin-bottom:6px;color:var(--day-son-strong);font:700 11px/1 var(--day-sans);letter-spacing:.14em;text-transform:uppercase}
.tl-day__canh p{margin:0;color:var(--day-ink-2);font:500 14.5px/1.6 var(--day-sans)}
.tl-day__canh em{font-style:normal;color:var(--day-son-strong);font-family:var(--day-jp);font-weight:700}

.tl-day__practice{margin:22px 26px 0;padding:1px 18px 18px;border:1px solid var(--day-line);border-radius:20px;background:color-mix(in srgb,var(--day-gold) 6%,var(--day-surface))}
.tl-day__practice .tl-day__vdlb{margin:18px 0 10px}
.tl-day__q{padding:15px 0;border-top:1px solid var(--day-line-soft)}
.tl-day__q:first-of-type{border-top:0}
.tl-day__q-label{color:var(--day-gold);font:700 12px/1.4 var(--day-sans);letter-spacing:.08em;text-transform:uppercase}
.tl-day__q-stem{margin-top:7px;color:var(--day-ink);font:600 clamp(18px,3.2vw,21px)/1.75 var(--day-jp)}
.tl-day__q-vn{margin-top:4px;color:var(--day-muted);font:500 13.5px/1.55 var(--day-sans)}
.tl-day__opts{display:grid;gap:9px;margin-top:12px}
.tl-day__opt{min-height:48px;padding:10px 12px;display:grid;grid-template-columns:28px minmax(0,1fr);align-items:center;gap:10px;border:1px solid var(--day-line);border-radius:13px;background:var(--day-surface);color:var(--day-ink);text-align:left;cursor:pointer}
.tl-day__opt>span{display:grid;place-items:center;width:28px;height:28px;border-radius:8px;background:var(--day-surface-2);color:var(--day-muted);font:700 12px var(--day-sans)}
.tl-day__opt>b{font:600 15px/1.65 var(--day-sans)}
.tl-day__opt.dung,.tl-day__opt.chon-dung{border-color:var(--day-green);background:color-mix(in srgb,var(--day-green) 10%,var(--day-surface))}
.tl-day__opt.chon-sai{border-color:var(--day-son);background:color-mix(in srgb,var(--day-son) 10%,var(--day-surface))}
.tl-day__feedback{margin-top:10px;padding:11px 12px;border-left:3px solid var(--day-green);background:var(--day-surface-2);color:var(--day-ink-2);font:500 14px/1.65 var(--day-sans)}
.tl-day__feedback strong{color:var(--day-green)}

.tl-day__nav{display:flex;align-items:center;gap:12px;padding:28px 26px 26px}
.tl-day__lui,.tl-day__tiep{min-height:48px;border:0;cursor:pointer}
.tl-day__lui{flex:0 0 auto;padding:0 10px;background:transparent;color:var(--day-muted);font-size:14px;font-weight:700}
.tl-day__lui[disabled]{opacity:.34;cursor:default}
.tl-day__tiep[disabled]{opacity:.45;cursor:not-allowed;box-shadow:none}
.tl-day__tiep{flex:1;padding:0 20px;display:flex;align-items:center;justify-content:center;gap:10px;border-radius:999px;
  background:var(--day-son);color:#fffaf0;font-size:15px;font-weight:800;box-shadow:0 10px 24px color-mix(in srgb,var(--day-son) 24%,transparent);transition:transform .16s,background .16s}
.tl-day__tiep:hover{background:var(--day-son-strong)}
.tl-day__tiep:active{transform:scale(.98)}
.tl-day__xong{background:var(--day-green)}

/* Màn tổng kết dùng bảng thật, không lặp thẻ công thức và ví dụ. */
.tl-day__man--tom-tat .tl-day__t{max-width:560px}
.tl-day__man--tom-tat .tl-day__g{font-size:16px}

/* Trạng thái do 14 trang chủ quản hiển thị sau khi hoàn thành. */
.tl-day--done{padding:14px 20px 20px}
.tl-day__hoan-tat{max-width:720px;margin:0 auto;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:14px;
  padding:17px 18px;border:1px solid var(--day-line);border-left:3px solid var(--day-green);background:var(--day-surface);box-shadow:var(--day-shadow)}
.tl-day__hoan-tat-ic{width:44px;height:44px;border-radius:50%;display:grid;place-items:center;background:color-mix(in srgb,var(--day-green) 12%,transparent);color:var(--day-green);font-size:20px;font-weight:800}
.tl-day__hoan-tat b{display:block;color:var(--day-ink);font:700 15px/1.4 var(--day-sans)}
.tl-day__hoan-tat span{display:block;margin-top:3px;color:var(--day-muted);font:500 13px/1.45 var(--day-sans)}
.tl-day__on-lai{min-height:44px;padding:9px 14px;border:1px solid var(--day-line);background:transparent;color:var(--day-son-strong);font:700 13.5px var(--day-sans);cursor:pointer;white-space:nowrap}

/* Các control của trang chủ quản vẫn hiện quanh vi-bài học: giữ cùng sàn chạm 44px. */
.app .hd .hd-back,.app .hd .hd-mode{
  width:44px!important;height:44px!important;min-width:44px!important;min-height:44px!important
}
html[data-selfdark] #tl-furi{min-height:44px!important;padding:9px 12px!important}
.app .spk{width:44px!important;height:44px!important;min-width:44px!important;min-height:44px!important}

/* Từ điện thoại ngang trở lên, giữ nguyên các cụm ngữ pháp ngắn;
   màn 320px vẫn được phép ngắt để không tạo tràn ngang. */
@media(min-width:390px){
  .tl-day__jp .target{white-space:nowrap}
}
@media(min-width:600px){
  .tl-day{scroll-margin-top:112px}
  .tl-day__ct b em{white-space:nowrap}
}

@media(max-width:560px){
  .tl-day__in{padding:8px 10px 18px}
  .tl-day__man{border-radius:20px}
  .tl-day__doan{padding:17px 16px 0;gap:6px}
  .tl-day__dau{padding:23px 18px 0}
  .tl-day__g,.tl-day__ct{margin-left:18px;margin-right:18px}
  .tl-day__vdlb{margin-left:18px;margin-right:18px}
  .tl-day__vd,.tl-day__them,.tl-day__bang,.tl-day__canh{margin-left:18px;margin-right:18px}
  .tl-day__practice{margin-left:18px;margin-right:18px;padding-inline:14px}
  .tl-day__v--chinh{padding:16px}
  .tl-day__nav{padding:24px 18px 22px}
  .tl-day__lui{padding-inline:4px}
  .tl-day__tiep{padding-inline:14px}
  .tl-day__hoan-tat{grid-template-columns:auto 1fr}
  .tl-day__on-lai{grid-column:1/-1;width:100%}
}
@media(max-width:340px){
  .tl-day__nav{align-items:stretch;flex-direction:column-reverse}
  .tl-day__lui,.tl-day__tiep{width:100%}
}
@media(prefers-reduced-motion:reduce){.tl-day *{animation:none!important;scroll-behavior:auto!important;transition:none!important}}