/* ============================================================
   luyen-thi-baihoc.css — Khối DẠY + BÀI TẬP TỰ CHẤM cho khu THPT/HSG
   Dùng kèm /trilu-cinema.css (data-theme="cinema"). Màu chạy bằng biến cinema
   nên TỰ ĐỦ sáng/tối; thêm vài override html[data-mode="light"] cho chắc.
   ============================================================ */

/* ---- Lưới điều hướng con trong hub (sub-nav 7 trang) ---- */
.subnav{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:14px;max-width:1100px;margin:0 auto}
.subnav a{position:relative;display:flex;flex-direction:column;gap:6px;padding:18px 20px;border-radius:16px;
  border:1px solid var(--line);background:rgba(255,255,255,.03);text-decoration:none;transition:transform .25s,border-color .25s,background .25s}
.subnav a:hover{transform:translateY(-3px);border-color:var(--gold);background:rgba(255,255,255,.05)}
.subnav .kj{font-family:var(--jp);font-weight:700;font-size:1.5rem;color:var(--gold);line-height:1}
.subnav h4{font-family:var(--serif);font-style:italic;font-weight:500;font-size:1.18rem;color:var(--ink);margin:0}
.subnav p{font-size:.84rem;color:var(--ink-d);margin:0}

/* ---- Thẻ ĐIỂM NGỮ PHÁP (dạy) ---- */
.gp{border:1px solid var(--line);border-radius:18px;background:rgba(255,255,255,.025);
  padding:clamp(18px,2.4vw,28px);margin:0 auto 18px;max-width:880px}
.gp-top{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;margin-bottom:6px}
.gp-mau{font-family:var(--jp);font-weight:700;font-size:clamp(1.3rem,2.4vw,1.7rem);color:var(--ink)}
.gp-rom{font-family:var(--mono);font-size:.82rem;color:var(--gold);letter-spacing:.04em}
.gp-y{font-family:var(--serif);font-style:italic;font-size:1.15rem;color:var(--gold);margin:2px 0 12px}
.gp h4{font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:var(--gold);margin:14px 0 6px;font-family:var(--mono)}
.gp-ct{font-family:var(--jp);background:rgba(127,127,127,.08);border-left:3px solid var(--gold);
  border-radius:0 8px 8px 0;padding:10px 14px;color:var(--ink);font-size:1.02rem}
.gp-vd{list-style:none;margin:6px 0 0;padding:0}
.gp-vd li{padding:9px 0 9px 4px;border-bottom:1px dashed var(--line);display:flex;gap:10px;align-items:flex-start}
.gp-vd li:last-child{border-bottom:none}
.gp-vd .ja{font-family:var(--jp);color:var(--ink);font-size:1.04rem;line-height:1.6}
.gp-vd .vi{color:var(--ink-d);font-size:.9rem;display:block;margin-top:2px}
.gp-note{font-size:.9rem;color:var(--ink-d);margin-top:10px}
.gp-note b{color:var(--ink)}

/* ---- Nút 🔊 đọc ---- */
.tts{flex:none;width:30px;height:30px;border-radius:9px;border:1px solid var(--line);
  background:rgba(127,127,127,.06);color:var(--gold);cursor:pointer;font-size:.95rem;line-height:1;
  display:inline-flex;align-items:center;justify-content:center;transition:background .2s,transform .2s}
.tts:hover{background:rgba(127,127,127,.14);transform:scale(1.08)}
.tts.dang{animation:ttsP .8s ease-in-out infinite}
@keyframes ttsP{0%,100%{opacity:1}50%{opacity:.45}}

/* ---- KHỐI BÀI TẬP TỰ CHẤM ---- */
.bt{border:1px solid var(--line);border-radius:18px;background:rgba(255,255,255,.02);
  padding:clamp(18px,2.4vw,28px);margin:22px auto;max-width:880px}
.bt-tt{display:flex;align-items:baseline;gap:10px;margin-bottom:4px}
.bt-tt .jp{font-family:var(--jp);color:var(--gold);font-size:.9rem}
.bt-tt h3{font-family:var(--serif);font-style:italic;font-weight:500;font-size:1.4rem;color:var(--ink);margin:0}
.bt-huong{font-size:.86rem;color:var(--ink-d);margin:0 0 14px}
.bt-cau{padding:16px 0;border-top:1px dashed var(--line)}
.bt-cau:first-of-type{border-top:none}
.bt-so{font-family:var(--mono);font-size:.72rem;color:var(--gold);letter-spacing:.1em}
.bt-hoi{font-family:var(--jp);color:var(--ink);font-size:1.08rem;line-height:1.7;margin:4px 0 12px}
.bt-lua{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.bt-lua li{display:flex;align-items:center;gap:11px;padding:11px 14px;border:1.5px solid var(--line);
  border-radius:11px;cursor:pointer;color:var(--ink);font-family:var(--jp);font-size:1rem;
  transition:border-color .18s,background .18s;background:rgba(127,127,127,.03)}
.bt-lua li::before{content:attr(data-n);flex:none;width:24px;height:24px;border-radius:7px;border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:.78rem;color:var(--ink-d)}
.bt-lua li:hover{border-color:var(--gold)}
.bt-lua li.sel{border-color:var(--gold);background:rgba(212,165,116,.16)}
.bt-lua li.sel::before{background:var(--gold);color:#1b1408;border-color:var(--gold)}
.bt.cham .bt-lua li{cursor:default}
.bt-lua li.dung{border-color:#3FA66A;background:rgba(63,166,106,.16)}
.bt-lua li.dung::before{content:"✓";background:#3FA66A;color:#fff;border-color:#3FA66A}
.bt-lua li.sai{border-color:var(--son);background:rgba(199,85,58,.15)}
.bt-lua li.sai::before{content:"✗";background:var(--son);color:#fff;border-color:var(--son)}
.bt-giai{display:none;margin-top:10px;padding:11px 14px;border-radius:0 10px 10px 0;
  border-left:3px solid var(--gold);background:rgba(212,165,116,.09);color:var(--ink-d);font-size:.92rem;line-height:1.6}
.bt-giai b{color:var(--ink)}
.bt.cham .bt-giai{display:block}
.bt-thanh{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-top:18px}
.bt-cham-nut,.bt-lam-lai{font-family:var(--mono);font-size:.74rem;letter-spacing:.12em;font-weight:700;
  padding:12px 22px;border-radius:11px;cursor:pointer;border:none;transition:transform .2s,box-shadow .2s}
.bt-cham-nut{background:linear-gradient(92deg,var(--son),var(--gold) 90%);color:#fff;box-shadow:0 8px 22px rgba(199,85,58,.28)}
.bt-cham-nut:hover{transform:translateY(-2px)}
.bt-lam-lai{background:rgba(127,127,127,.1);color:var(--ink);border:1px solid var(--line)}
.bt-kq{font-family:var(--serif);font-style:italic;font-size:1.15rem;color:var(--gold)}
.bt-kq.tot{color:#3FA66A}

/* ---- Override CHẾ ĐỘ SÁNG (cho chắc nền/chữ tương phản) ---- */
html[data-mode="light"] .subnav a,
html[data-mode="light"] .gp,
html[data-mode="light"] .bt{background:rgba(255,255,255,.66);border-color:rgba(27,58,107,.14)}
html[data-mode="light"] .subnav a:hover{background:#fff}
html[data-mode="light"] .gp-ct{background:rgba(27,58,107,.05)}
html[data-mode="light"] .bt-lua li{background:#fff;border-color:rgba(27,58,107,.16)}
html[data-mode="light"] .bt-lua li.sel{background:rgba(212,165,116,.22);border-color:var(--gold)}
html[data-mode="light"] .bt-lua li.dung{background:rgba(63,166,106,.14);border-color:#2E9E6B}
html[data-mode="light"] .bt-lua li.sai{background:rgba(199,85,58,.12)}
html[data-mode="light"] .bt-giai{background:rgba(212,165,116,.14)}