/* Target CMS — Topic Bank · matches the PYQ Practice Platform theme */
.tcb-root{
  --bg:#f6f8fb; --bg-soft:#eef2f8; --surface:#fff; --surface-2:#fafbfd;
  --ink:#0f1b2d; --ink-2:#3a4759; --ink-3:#697789; --line:#e3e9f2; --line-2:#d2dbe8;
  --brand:#3a5bd9; --brand-deep:#2942b5; --brand-soft:#e8edfd; --brand-tint:#f2f5fe;
  --teal:#0f9e8e; --teal-soft:#dbf3ef;
  --green:#16a34a; --green-soft:#dcfce7; --green-deep:#0f7a37;
  --red:#dc2d3f; --red-soft:#fde4e6; --red-deep:#b01828;
  --amber:#e08a1e; --amber-soft:#fdf0d9; --amber-deep:#b56c10;
  --violet:#7c5cdb;
  --r-sm:8px; --r:14px; --r-lg:20px; --r-xl:28px;
  --sh-sm:0 1px 2px rgba(15,27,45,.04),0 1px 3px rgba(15,27,45,.06);
  --sh:0 2px 4px rgba(15,27,45,.04),0 8px 24px rgba(15,27,45,.07);
  --sh-lg:0 4px 8px rgba(15,27,45,.05),0 18px 48px rgba(15,27,45,.12);
  --sh-brand:0 8px 28px rgba(58,91,217,.28);
  --disp:'Onest',-apple-system,system-ui,sans-serif;
  --body:'Manrope',-apple-system,system-ui,sans-serif;
  --ease:cubic-bezier(.4,0,.2,1);
  font-family:var(--body);color:var(--ink);line-height:1.5;max-width:1280px;margin:0 auto;
  padding:28px 22px 40px;-webkit-font-smoothing:antialiased;
  overflow-x:hidden;box-sizing:border-box;
  background:
    radial-gradient(circle at 0% 0%,rgba(58,91,217,.05),transparent 32%),
    radial-gradient(circle at 100% 4%,rgba(15,158,142,.05),transparent 30%);
  border-radius:var(--r-xl)}
.tcb-root *{box-sizing:border-box}
.tcb-root a{color:inherit;text-decoration:none}
/* topic-view content stays at a comfortable reading width; index grid fills full width */
.tcb-wrap{max-width:920px;margin:0 auto}
.tcb-loading{padding:48px;text-align:center;color:var(--ink-3)}
.tcb-empty{padding:28px;text-align:center;color:var(--ink-3)}
@keyframes tcbRise{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* shared bits */
.tcb-eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--disp);font-size:.7rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--brand);background:var(--brand-soft);padding:7px 14px;border-radius:100px}
.tcb-grad{background:linear-gradient(120deg,var(--brand),var(--teal));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.tcb-chip{display:inline-flex;align-items:center;gap:5px;font-family:var(--disp);font-size:.64rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;padding:5px 11px;border-radius:100px;border:1px solid var(--line-2);color:var(--ink-3);background:var(--surface-2)}
.tcb-chip.subj{background:var(--brand-soft);border-color:transparent;color:var(--brand-deep)}
.tcb-chip.qn{background:var(--teal-soft);border-color:transparent;color:var(--teal)}
.tcb-chip.rr{background:var(--amber-soft);border-color:transparent;color:var(--amber-deep)}
.tcb-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:var(--body);font-weight:700;font-size:.95rem;padding:.78em 1.5em;border-radius:var(--r);border:none;cursor:pointer;transition:.18s var(--ease)}
.tcb-btn:active{transform:scale(.97)}
.tcb-primary{background:var(--brand);color:#fff;box-shadow:var(--sh-sm)}
.tcb-primary:hover:not(:disabled){background:var(--brand-deep);box-shadow:var(--sh-brand);transform:translateY(-1px)}
.tcb-ghost{background:var(--surface);color:var(--ink-2);border:1.5px solid var(--line-2)}
.tcb-ghost:hover:not(:disabled){border-color:var(--brand);color:var(--brand);background:var(--brand-tint)}
.tcb-btn:disabled{opacity:.4;cursor:not-allowed}

/* ---------- INDEX ---------- */
.tcb-hero{margin-bottom:22px}
.tcb-h{font-family:var(--disp);font-size:2rem;font-weight:800;letter-spacing:-.02em;margin:12px 0 8px;line-height:1.1}
.tcb-sub{color:var(--ink-2);margin:0 0 16px;font-size:1rem;max-width:620px}
.tcb-sub strong{color:var(--ink)}
.tcb-search{width:100%;max-width:540px;padding:14px 18px;border:1.5px solid var(--line-2);border-radius:var(--r);font-size:1rem;font-family:inherit;background:var(--surface);outline:none;transition:.18s var(--ease);box-shadow:var(--sh-sm)}
.tcb-search:focus{border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}
.tcb-subject{margin:26px 0 0}
.tcb-subject-h{font-family:var(--disp);font-size:1.18rem;font-weight:800;margin:0 0 12px;display:flex;align-items:center;gap:10px;color:var(--ink);flex-wrap:wrap}
.tcb-subject-link{color:var(--ink);transition:.15s}
.tcb-subject-link:hover{color:var(--brand)}
.tcb-attempt-all{margin-left:auto;font-family:var(--body);font-size:.74rem;font-weight:700;color:var(--brand-deep);background:var(--brand-soft);padding:6px 12px;border-radius:100px;transition:.15s var(--ease);white-space:nowrap}
.tcb-attempt-all:hover{background:var(--brand);color:#fff;transform:translateY(-1px)}
.tcb-count{font-family:var(--disp);font-size:.66rem;font-weight:700;color:var(--brand-deep);background:var(--brand-soft);padding:3px 10px;border-radius:100px}
.tcb-topics{display:grid;grid-template-columns:repeat(auto-fill,minmax(255px,1fr));gap:12px}
.tcb-topic{position:relative;display:flex;justify-content:space-between;align-items:center;gap:10px;padding:15px 16px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--sh-sm);transition:.2s var(--ease);overflow:hidden}
.tcb-topic::after{content:"";position:absolute;inset:0;border-radius:var(--r);padding:1.5px;background:linear-gradient(135deg,var(--brand),var(--teal));-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:.24s}
.tcb-topic:hover{transform:translateY(-2px);box-shadow:var(--sh);border-color:transparent}
.tcb-topic:hover::after{opacity:1}
.tcb-topic-name{font-weight:600;font-size:.95rem;line-height:1.35;color:var(--ink)}
.tcb-topic-meta{display:flex;flex-direction:column;gap:5px;align-items:flex-end;flex-shrink:0}
.tcb-qn{font-family:var(--disp);font-size:.62rem;font-weight:700;letter-spacing:.04em;color:var(--teal);background:var(--teal-soft);padding:3px 9px;border-radius:100px;white-space:nowrap}
.tcb-rr{font-size:.66rem;color:var(--ink-3);white-space:nowrap}
.tcb-arrow{color:var(--brand);opacity:0;transform:translateX(-4px);transition:.2s}
.tcb-topic:hover .tcb-arrow{opacity:1;transform:none}

/* ---------- TOPIC VIEW ---------- */
.tcb-topbar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px;flex-wrap:wrap}
.tcb-switches{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end;flex:1;min-width:0}
.tcb-back{font-weight:700;color:var(--brand);font-size:.9rem}
.tcb-switch{padding:10px 12px;border:1.5px solid var(--line-2);border-radius:var(--r);font-family:inherit;font-size:.86rem;background:var(--surface);color:var(--ink);box-shadow:var(--sh-sm);cursor:pointer;max-width:220px}
.tcb-qtopic{font-family:var(--disp);font-size:.64rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--teal);background:var(--teal-soft);padding:5px 11px;border-radius:100px}
.tcb-head{margin-bottom:6px}
.tcb-title{font-family:var(--disp);font-size:1.65rem;font-weight:800;letter-spacing:-.01em;margin:10px 0 10px;line-height:1.15}
.tcb-chips{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:6px}
.tcb-progress{height:7px;background:var(--bg-soft);border-radius:100px;overflow:hidden;margin-top:16px}
.tcb-progress-bar{height:100%;border-radius:100px;background:linear-gradient(90deg,var(--brand),var(--teal));transition:width .4s var(--ease)}
.tcb-progress-txt{font-family:var(--disp);font-size:.72rem;font-weight:600;letter-spacing:.04em;color:var(--ink-3);margin:7px 0 18px;text-transform:uppercase}

.tcb-qcard{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:30px 32px;box-shadow:var(--sh);animation:tcbRise .35s var(--ease)}
.tcb-anim-next{animation:tcbInL .24s var(--ease)}
.tcb-anim-prev{animation:tcbInR .24s var(--ease)}
@keyframes tcbInL{from{opacity:0;transform:translateX(30px)}to{opacity:1;transform:none}}
@keyframes tcbInR{from{opacity:0;transform:translateX(-30px)}to{opacity:1;transform:none}}
.tcb-swipe-hint{display:none;font-size:.74rem;color:var(--muted);text-align:center;margin:-4px 0 14px;letter-spacing:.01em}
.tcb-swipe-hint::before{content:"";display:inline-block;vertical-align:middle;margin-right:7px;width:16px;height:2px;border-radius:2px;background:var(--line-2)}
.tcb-swipe-hint::after{content:"";display:inline-block;vertical-align:middle;margin-left:7px;width:16px;height:2px;border-radius:2px;background:var(--line-2)}
@media(pointer:coarse){.tcb-swipe-hint{display:block}}
@media(prefers-reduced-motion:reduce){.tcb-qcard,.tcb-anim-next,.tcb-anim-prev{animation:none}}
.tcb-qtop{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:18px}
.tcb-qno{font-family:var(--disp);font-size:.64rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--brand-deep);background:var(--brand-soft);padding:5px 11px;border-radius:100px}
.tcb-qlabel{font-family:var(--disp);font-size:.64rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--ink-3);background:var(--surface-2);border:1px solid var(--line-2);padding:5px 11px;border-radius:100px}
.tcb-stem{font-size:1.12rem;font-weight:500;line-height:1.6;margin-bottom:20px;color:var(--ink);word-break:break-word;overflow-wrap:break-word;max-width:100%}
.tcb-stem .tcb-sl{text-align:left;text-wrap:pretty;margin:0 0 9px;overflow-wrap:break-word;word-break:break-word}
.tcb-stem .tcb-st{text-align:left;margin:0 0 7px;padding-left:24px;text-indent:-24px;overflow-wrap:break-word;word-break:break-word}
.tcb-stem>div:last-child{margin-bottom:0}
.tcb-opts{display:flex;flex-direction:column;gap:12px}
.tcb-opt{display:flex;gap:15px;align-items:center;width:100%;text-align:left;padding:16px 18px;border:1.5px solid var(--line-2);border-radius:var(--r);background:var(--surface);font-family:inherit;cursor:pointer;transition:.18s var(--ease);position:relative}
.tcb-opt:hover:not(:disabled){border-color:var(--brand);background:var(--brand-tint)}
.tcb-opt-l{font-family:var(--disp);font-weight:700;font-size:.92rem;width:32px;height:32px;border-radius:9px;border:1.5px solid var(--line-2);display:flex;align-items:center;justify-content:center;flex-shrink:0;background:var(--surface-2);color:var(--ink-2);transition:.18s}
.tcb-opt-t{font-size:1.05rem;line-height:1.5;color:var(--ink);flex:1;text-wrap:pretty;word-break:break-word;overflow-wrap:break-word}
.tcb-mark{margin-left:auto;display:inline-flex;align-items:center;gap:5px;font-family:var(--disp);font-size:.62rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase}
.tcb-mark svg{width:15px;height:15px;stroke-width:2.6;fill:none}
.tcb-chosen{border-color:var(--brand);background:var(--brand-tint);box-shadow:0 0 0 3px var(--brand-soft)}
.tcb-chosen .tcb-opt-l{background:var(--brand);color:#fff;border-color:var(--brand)}
.tcb-opt:disabled{cursor:default}
.tcb-correct{border-color:var(--green);background:var(--green-soft)}
.tcb-correct .tcb-opt-l{background:var(--green);color:#fff;border-color:var(--green)}
.tcb-correct .tcb-mark{color:var(--green-deep)}
.tcb-wrong{border-color:var(--red);background:var(--red-soft)}
.tcb-wrong .tcb-opt-l{background:var(--red);color:#fff;border-color:var(--red)}
.tcb-wrong .tcb-mark{color:var(--red-deep)}
.tcb-check{margin-top:18px}

/* reveal */
.tcb-reveal{margin-top:22px;animation:tcbRise .4s var(--ease)}
.tcb-expl-box{border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.tcb-eb-head{display:flex;align-items:center;gap:10px;padding:13px 18px;background:linear-gradient(135deg,var(--brand-tint),var(--teal-soft));border-bottom:1px solid var(--line)}
.tcb-eb-title{font-family:var(--disp);font-weight:800;font-size:.95rem;color:var(--ink)}
.tcb-ans-badge{margin-left:auto;font-family:var(--disp);font-size:.7rem;font-weight:700;background:var(--green);color:#fff;padding:5px 12px;border-radius:100px;letter-spacing:.03em}
.tcb-eb-body{padding:16px 18px;background:var(--surface)}
.tcb-ans-line{font-size:1.04rem;line-height:1.55;color:var(--ink);margin-bottom:14px}
.tcb-ans-line b{color:var(--green-deep)}
.tcb-exp-text{background:var(--green-soft);border:1px solid #bbe9c9;border-left:4px solid var(--green);border-radius:var(--r-sm);padding:13px 15px;margin-bottom:16px}
.tcb-exp-label{display:inline-flex;align-items:center;gap:6px;font-family:var(--disp);font-size:.66rem;font-weight:800;letter-spacing:.07em;text-transform:uppercase;color:var(--green-deep);margin-bottom:7px}
.tcb-exp-label svg{width:14px;height:14px;fill:none;stroke-width:3.2;stroke-linecap:round;stroke-linejoin:round}
.tcb-exp-text p{margin:0;font-size:1rem;line-height:1.6;color:var(--ink);text-align:left;overflow-wrap:break-word;word-break:break-word}
.tcb-exp-list{margin:0;padding:0;list-style:none}
.tcb-exp-list li{position:relative;padding-left:18px;margin:0 0 7px;font-size:1rem;line-height:1.55;color:var(--ink);text-align:left;overflow-wrap:break-word;word-break:break-word}
.tcb-exp-list li:last-child{margin-bottom:0}
.tcb-exp-list li::before{content:"";position:absolute;left:3px;top:.62em;width:6px;height:6px;border-radius:50%;background:var(--green)}
/* Rich, colour-coded explanation (exact colours preserved from the source file).
   Neutral container so the explanation's own green/amber/teal/blue/purple shows cleanly. */
.tcb-exp-rich{background:var(--surface-2);border:1px solid var(--line);border-left:4px solid var(--brand);border-radius:var(--r-sm);padding:13px 16px;margin-bottom:16px}
.tcb-exp-rich>.tcb-exp-label{margin-bottom:9px}
.tcb-exp-rich-body{font-size:1rem;line-height:1.6;color:var(--ink);text-align:left;overflow-wrap:break-word;word-break:break-word}
.tcb-exp-rich-body p{margin:0 0 9px;text-align:left;overflow-wrap:break-word;word-break:break-word}
.tcb-exp-rich-body p:last-child{margin-bottom:0}
.tcb-exp-rich-body ul,.tcb-exp-rich-body ol{margin:6px 0 10px;padding-left:20px}
.tcb-exp-rich-body li{margin:0 0 5px;line-height:1.55}
.tcb-exp-rich-body li:last-child{margin-bottom:0}
.tcb-exp-rich-body strong{font-weight:700}
.tcb-exp-rich-body em{font-style:italic}
.tcb-exp-rich-body sub{font-size:.75em;vertical-align:sub}
.tcb-exp-rich-body sup{font-size:.75em;vertical-align:super}
.tcb-tablewrap{display:block;width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;margin:9px 0;border-radius:8px;border:1px solid var(--line-2)}
.tcb-exp-rich-body table,.tcb-tablewrap table{border-collapse:collapse;width:100%;margin:0;font-size:.9rem;line-height:1.42;background:var(--surface)}
.tcb-exp-rich-body th,.tcb-exp-rich-body td,.tcb-tablewrap th,.tcb-tablewrap td{border:1px solid var(--line-2);padding:7px 10px;text-align:left;vertical-align:top;white-space:normal;overflow-wrap:break-word;word-break:break-word;min-width:88px}
.tcb-exp-rich-body th,.tcb-tablewrap th{font-weight:700;background:var(--brand-tint)}
.tcb-exp-rich-body tbody tr:nth-child(even) td,.tcb-tablewrap tbody tr:nth-child(even) td{background:var(--surface-2)}
.tcb-ref-h{font-family:var(--disp);font-size:.68rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-3);margin-bottom:10px}
.tcb-ref-row{display:flex;gap:12px;align-items:flex-start;padding:9px 13px;border-radius:var(--r-sm);background:var(--surface-2);border:1px solid var(--line);margin-bottom:8px;font-size:.96rem;color:var(--ink-2);line-height:1.45}
.tcb-ref-row b{color:var(--ink)}
.tcb-ref-ic{font-size:1.15rem;line-height:1.1}
.tcb-ref-pg{font-family:var(--disp);font-weight:700;color:var(--brand-deep)}

/* book card (matches PYQ .book-mini) */
.tcb-book{display:flex;align-items:center;gap:12px;margin-top:14px;padding:9px 11px;border:1px solid var(--line);border-radius:12px;background:var(--surface-2);transition:.18s var(--ease);max-width:440px}
.tcb-book:hover{border-color:var(--brand);background:#fff;box-shadow:0 5px 16px rgba(58,91,217,.10)}
.tcb-book-cover{width:42px;height:58px;object-fit:cover;border-radius:5px;flex-shrink:0;box-shadow:0 2px 7px rgba(15,27,45,.22)}
.tcb-book-text{display:flex;flex-direction:column;gap:1px;min-width:0;flex:1}
.tcb-book-t{font-family:var(--body);font-weight:700;font-size:.86rem;line-height:1.25;color:var(--ink)}
.tcb-book-s{font-size:.74rem;line-height:1.3;color:var(--ink-2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tcb-book-cta{flex-shrink:0;font-family:var(--body);font-weight:700;font-size:.8rem;color:var(--brand);background:var(--brand-soft);padding:8px 13px;border-radius:9px;white-space:nowrap;transition:.18s var(--ease)}
.tcb-book:hover .tcb-book-cta{background:var(--brand);color:#fff}

.tcb-nav{display:flex;justify-content:space-between;gap:12px;margin-top:22px}
.tcb-nav .tcb-btn{min-width:130px}
.tcb-nav-top{margin-top:0;margin-bottom:18px;align-items:center;gap:10px}
.tcb-nav-top .tcb-btn{min-width:0;padding:.55em 1.15em;font-size:.86rem}
.tcb-navpos{font-family:var(--disp);font-size:.72rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--ink-3);white-space:nowrap}

/* ===== Responsive ===== */
@media(max-width:980px){
  .tcb-root{padding:24px 18px 36px}
  .tcb-topics{grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:10px}
  .tcb-h{font-size:1.8rem}
}
@media(max-width:760px){
  .tcb-root{padding:20px 15px 32px;border-radius:var(--r-lg)}
  .tcb-topics{grid-template-columns:repeat(auto-fill,minmax(220px,1fr))}
  .tcb-h{font-size:1.55rem}
  .tcb-title{font-size:1.4rem}
  .tcb-qcard{padding:24px 22px}
  .tcb-search{max-width:none}
}
@media(max-width:600px){
  .tcb-root{padding:16px 13px 28px;border-radius:var(--r)}
  .tcb-topics{grid-template-columns:1fr;gap:10px}
  .tcb-h{font-size:1.42rem;line-height:1.18}
  .tcb-sub{font-size:.94rem}
  .tcb-subject-h{font-size:1.06rem}
  .tcb-title{font-size:1.28rem}
  .tcb-qcard{padding:18px 16px}
  .tcb-stem{font-size:1.04rem}
  .tcb-opt{padding:13px 13px;gap:11px}
  .tcb-opt-l{width:28px;height:28px;font-size:.84rem}
  .tcb-opt-t{font-size:.98rem}
  .tcb-mark{font-size:.56rem}
  .tcb-topbar{gap:8px}
  .tcb-back{padding:.6em 1em;font-size:.85rem}
  .tcb-switches{width:100%}
  .tcb-switch{max-width:none;flex:1 1 140px;min-width:0}
  .tcb-book{max-width:none;flex-wrap:wrap}
  .tcb-book-s{white-space:normal}
  .tcb-nav{gap:9px}
  .tcb-nav .tcb-btn{min-width:0;flex:1;padding:.78em .6em;font-size:.9rem}
  .tcb-nav-top .tcb-btn{flex:0 0 auto;padding:.5em .8em;font-size:.8rem}
  .tcb-navpos{font-size:.62rem}
  .tcb-ref-row{font-size:.92rem}
}
@media(max-width:400px){
  .tcb-h{font-size:1.3rem}
  .tcb-title{font-size:1.18rem}
  .tcb-opt-t{font-size:.94rem}
  .tcb-mark-t{display:none}
  .tcb-mark{gap:0}
}

/* ===== Books Carousel — compact horizontal scroll strip ===== */
.tcbc-strip{background:linear-gradient(110deg,#16243c,#1e3a6e 60%,#16463f);border-radius:12px;overflow:hidden;margin:0 0 14px;box-shadow:0 2px 12px rgba(0,0,0,.18)}
.tcbc-strip-hd{display:flex;align-items:center;justify-content:space-between;padding:7px 12px 4px}
.tcbc-strip-title{font-size:.56rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:#a9c0f5}
.tcbc-strip-close{width:18px;height:18px;border-radius:50%;background:rgba(255,255,255,.15);color:#fff;display:flex;align-items:center;justify-content:center;font-size:.82rem;line-height:1;border:none;cursor:pointer;padding:0;flex-shrink:0}
.tcbc-strip-close:hover{background:rgba(255,255,255,.3)}
.tcbc-strip-scroll{display:flex;gap:9px;overflow-x:auto;padding:0 12px 10px;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;scrollbar-width:none;cursor:grab}
.tcbc-strip-scroll::-webkit-scrollbar{display:none}
.tcbc-strip-scroll:active{cursor:grabbing}
.tcbc-card{display:flex;align-items:center;gap:8px;flex-shrink:0;width:200px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);border-radius:9px;padding:7px 8px;text-decoration:none;transition:.16s;scroll-snap-align:start;overflow:hidden;color:inherit}
.tcbc-card:hover{background:rgba(255,255,255,.15);border-color:rgba(255,255,255,.26)}
.tcbc-cover{width:36px;height:48px;border-radius:4px;object-fit:cover;display:block;box-shadow:0 2px 7px rgba(0,0,0,.4);flex-shrink:0;margin:0}
.tcbc-cover-ph{width:36px;height:48px;border-radius:4px;background:linear-gradient(135deg,var(--amber,#E08A1E),#b56c10);display:flex;align-items:center;justify-content:center;flex-shrink:0;margin:0}
.tcbc-cover-ph svg{width:22px;height:30px}
.tcbc-card-body{flex:1;min-width:0;display:flex;flex-direction:column;gap:1px}
.tcbc-card-label{display:none}
.tcbc-card-title{font-size:.73rem;font-weight:700;color:#fff;line-height:1.18;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.tcbc-card-sub{font-size:.6rem;color:#b8cde8;line-height:1.2;margin-top:1px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tcbc-card-btn{flex-shrink:0;background:#fff;color:#16243c;font-size:.64rem;font-weight:700;padding:5px 8px;border-radius:6px;white-space:nowrap;transition:.15s;align-self:center}
.tcbc-card:hover .tcbc-card-btn{background:var(--amber,#E08A1E);color:#fff}
@media(max-width:480px){
  .tcbc-strip{border-radius:10px;margin:0 0 12px}
  .tcbc-card{width:185px;gap:7px;padding:7px 7px}
  .tcbc-cover,.tcbc-cover-ph{width:30px;height:40px}
  .tcbc-card-title{font-size:.7rem}
  .tcbc-card-sub{font-size:.56rem}
  .tcbc-card-btn{font-size:.6rem;padding:5px 7px}
}

/* ===== HARD WIDTH CLAMP — nothing exceeds viewport ===== */
.tcb-root,.tcb-wrap,.tcb-qcard,.tcb-topicview{max-width:100%;min-width:0;overflow-x:hidden;box-sizing:border-box}
.tcb-qcard>*{max-width:100%}
.tcb-nav .tcb-btn{max-width:100%;box-sizing:border-box}

/* ===== Explanation: left-align + responsive tables on mobile ===== */
@media(max-width:600px){
  .tcb-stem .tcb-sl,.tcb-stem .tcb-st,.tcb-exp-text p,.tcb-exp-list li,.tcb-exp-rich-body,.tcb-exp-rich-body p,.tcb-exp-rich-body li{text-align:left !important}
}
@media(max-width:480px){
  .tcb-eb-head{padding:10px 13px}
  .tcb-eb-title{font-size:.88rem}
  .tcb-eb-body{padding:13px 13px}
  .tcb-exp-text{padding:11px 12px;margin-bottom:13px}
  .tcb-exp-rich{padding:11px 13px;margin-bottom:13px}
  .tcb-exp-text p,.tcb-exp-list li,.tcb-exp-rich-body{font-size:.95rem;line-height:1.55}
  .tcb-exp-rich-body table,.tcb-tablewrap table{font-size:.83rem}
  .tcb-exp-rich-body th,.tcb-exp-rich-body td,.tcb-tablewrap th,.tcb-tablewrap td{padding:6px 8px;min-width:74px}
  .tcb-ref-row{padding:8px 11px;font-size:.9rem;gap:9px}
}

/* ==========================================================================
   v2.0.0 — exam chooser, state picker, and the book promo band
   ========================================================================== */

/* --- shared top bar on the index / picker screens --- */
.tcb-topbar-plain{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:0 0 18px}
.tcb-examtag{margin-left:auto;font-family:var(--disp);font-size:.66rem;font-weight:700;letter-spacing:.09em;
  text-transform:uppercase;color:var(--ink-3);background:var(--surface-2);border:1px solid var(--line-2);
  padding:6px 13px;border-radius:100px;white-space:nowrap}

/* --- SCREEN 1 · exam chooser --- */
.tcb-hero-c{text-align:center;max-width:680px;margin:6px auto 26px}
.tcb-hero-c .tcb-sub{margin-left:auto;margin-right:auto}
.tcb-pickgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:18px;max-width:900px;margin:0 auto}
.tcb-pick{position:relative;display:flex;flex-direction:column;gap:9px;padding:26px 24px 22px;background:var(--surface);
  border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-sm);transition:.22s var(--ease);overflow:hidden}
.tcb-pick::before{content:"";position:absolute;top:0;left:0;right:0;height:5px;
  background:linear-gradient(90deg,var(--brand),var(--teal))}
.tcb-pick-state::before{background:linear-gradient(90deg,#d1495b,var(--amber))}
.tcb-pick:hover{transform:translateY(-3px);box-shadow:var(--sh-lg);border-color:transparent}
.tcb-pick-badge{align-self:flex-start;font-family:var(--disp);font-size:.62rem;font-weight:800;letter-spacing:.12em;
  text-transform:uppercase;color:var(--brand-deep);background:var(--brand-soft);padding:5px 12px;border-radius:100px}
.tcb-pick-badge.alt{color:#a3243a;background:#fde8ec}
.tcb-pick-t{font-family:var(--disp);font-size:1.5rem;font-weight:800;letter-spacing:-.02em;color:var(--ink);line-height:1.15}
.tcb-pick-s{color:var(--ink-2);font-size:.95rem;line-height:1.5}
.tcb-pick-stats{font-size:.84rem;color:var(--ink-3);padding-top:4px;border-top:1px dashed var(--line-2);margin-top:4px}
.tcb-pick-stats b{color:var(--ink)}
.tcb-pick-go{margin-top:8px;font-family:var(--disp);font-weight:800;font-size:.92rem;color:var(--brand)}
.tcb-pick-state .tcb-pick-go{color:#c03a52}

/* --- SCREEN 2 · state picker --- */
.tcb-states{display:grid;grid-template-columns:repeat(auto-fill,minmax(255px,1fr));gap:14px}
.tcb-state{display:flex;flex-direction:column;gap:7px;padding:18px 18px 16px;background:var(--surface);
  border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--sh-sm);transition:.2s var(--ease)}
.tcb-state.live:hover{transform:translateY(-2px);box-shadow:var(--sh);border-color:#f0b8c2}
.tcb-state.soon{background:var(--surface-2);box-shadow:none;opacity:.72}
.tcb-state-hd{display:flex;align-items:center;gap:9px;flex-wrap:wrap}
.tcb-state-n{font-family:var(--disp);font-size:1.08rem;font-weight:800;color:var(--ink)}
.tcb-state-live{font-family:var(--disp);font-size:.6rem;font-weight:800;letter-spacing:.09em;text-transform:uppercase;
  color:#0f7a37;background:var(--green-soft);padding:3px 9px;border-radius:100px}
.tcb-state-soon{font-family:var(--disp);font-size:.6rem;font-weight:800;letter-spacing:.09em;text-transform:uppercase;
  color:var(--ink-3);background:var(--bg-soft);padding:3px 9px;border-radius:100px}
.tcb-state-b{font-size:.88rem;color:var(--ink-2)}
.tcb-state-stats{font-size:.79rem;color:var(--ink-3)}
.tcb-state-stats b{color:var(--ink-2)}
.tcb-state-go{margin-top:4px;font-family:var(--disp);font-weight:800;font-size:.85rem;color:#c03a52}

/* --- BOOK PROMO BAND (top of the index — the shop window) --- */
.tcb-promo{margin:0 0 26px;padding:20px 20px 18px;border-radius:var(--r-lg);
  background:linear-gradient(135deg,#fff7f8,#fdf5e9 60%,#f4f7ff);
  border:1px solid #f2dfe3;box-shadow:var(--sh-sm)}
.tcb-promo-bottom{margin:34px 0 0}
.tcb-promo-hd{margin-bottom:15px}
.tcb-promo-eyebrow{display:inline-flex;font-family:var(--disp);font-size:.63rem;font-weight:800;letter-spacing:.12em;
  text-transform:uppercase;color:#a3243a;background:#fde8ec;padding:5px 12px;border-radius:100px}
.tcb-promo-t{font-family:var(--disp);font-size:1.22rem;font-weight:800;letter-spacing:-.015em;color:var(--ink);margin:10px 0 5px}
.tcb-promo-s{margin:0;color:var(--ink-2);font-size:.92rem;line-height:1.5;max-width:660px}
.tcb-promo-books{display:grid;grid-template-columns:repeat(auto-fit,minmax(270px,1fr));gap:13px}
.tcb-promo-book{display:flex;gap:14px;padding:13px;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r);box-shadow:var(--sh-sm);transition:.2s var(--ease)}
.tcb-promo-book:hover{transform:translateY(-2px);box-shadow:var(--sh);border-color:#e8b9c3}
.tcb-promo-cover{width:74px;height:104px;object-fit:cover;border-radius:6px;flex-shrink:0;
  box-shadow:0 3px 10px rgba(15,27,45,.16);background:var(--bg-soft)}
.tcb-promo-body{display:flex;flex-direction:column;gap:5px;min-width:0}
.tcb-promo-bt{font-family:var(--disp);font-weight:800;font-size:.95rem;color:var(--ink);line-height:1.28}
.tcb-promo-bs{font-size:.79rem;color:var(--ink-3);line-height:1.45}
.tcb-promo-buy{margin-top:auto;align-self:flex-start;font-family:var(--disp);font-weight:800;font-size:.78rem;
  color:#fff;background:#c03a52;padding:7px 14px;border-radius:100px;white-space:nowrap;transition:.18s var(--ease)}
.tcb-promo-book:hover .tcb-promo-buy{background:#a3243a}
.tcb-promo-cta{display:inline-block;margin-top:14px;font-family:var(--disp);font-weight:800;font-size:.86rem;color:#a3243a}
.tcb-promo-cta:hover{text-decoration:underline}

/* UPSC CMS keeps the blue/teal identity on its promo band */
.tcb-exam-cms .tcb-promo{background:linear-gradient(135deg,#f4f7ff,#eefaf8 60%,#f7f9ff);border-color:#dde6fb}
.tcb-exam-cms .tcb-promo-eyebrow{color:var(--brand-deep);background:var(--brand-soft)}
.tcb-exam-cms .tcb-promo-buy{background:var(--brand)}
.tcb-exam-cms .tcb-promo-book:hover .tcb-promo-buy{background:var(--brand-deep)}
.tcb-exam-cms .tcb-promo-book:hover{border-color:#b9c9f5}
.tcb-exam-cms .tcb-promo-cta{color:var(--brand-deep)}

@media (max-width:640px){
  .tcb-pick{padding:22px 18px 18px}
  .tcb-pick-t{font-size:1.28rem}
  .tcb-promo{padding:16px 14px 15px}
  .tcb-promo-t{font-size:1.08rem}
  .tcb-promo-cover{width:62px;height:88px}
  .tcb-examtag{margin-left:0}
}

/* ==========================================================================
   v2.0.1 — mobile reading width & wide tables
   --------------------------------------------------------------------------
   On a 390px phone the explanation text column was only ~271px wide: the root,
   the question card, the explanation box and the rich-explanation panel each
   added their own left+right padding, so ~31% of the screen went to nested
   chrome. Squeezed into what was left, the high-yield tables forced three
   columns into ~90px each and chopped words mid-letter ("SARCO MERE",
   "unchange d"). Two fixes: give the padding back, and let a table that is
   genuinely too wide SCROLL sideways instead of crushing itself.
   ========================================================================== */

@media(max-width:600px){
  .tcb-root{padding:12px 9px 26px}
  .tcb-qcard{padding:15px 11px}
  .tcb-eb-head{padding:10px 11px}
  .tcb-eb-body{padding:12px 10px}
  .tcb-exp-rich{padding:11px 10px;border-left-width:3px}
  .tcb-exp-text{padding:11px 10px}
  .tcb-reveal{margin-top:16px}
  .tcb-ref-row{padding:8px 10px;gap:8px}
  .tcb-opt{padding:12px 11px;gap:10px}
}
@media(max-width:400px){
  .tcb-root{padding:10px 6px 22px}
  .tcb-qcard{padding:13px 9px}
  .tcb-eb-body{padding:11px 8px}
  .tcb-exp-rich{padding:10px 9px}
  .tcb-exp-text{padding:10px 9px}
}

/* --- wide tables: scroll on a phone, unchanged on desktop --- */
.tcb-tablewrap{position:relative;overflow-x:auto;overscroll-behavior-x:contain}
/* Wrap at spaces; break inside a word only if it genuinely cannot fit. */
.tcb-exp-rich-body th,.tcb-exp-rich-body td,
.tcb-tablewrap th,.tcb-tablewrap td{
  word-break:normal !important;overflow-wrap:anywhere !important;hyphens:none}
/* Desktop keeps the old full-width table — this only kicks in on small screens. */
@media(max-width:600px){
  .tcb-exp-rich-body .tcb-tablewrap table,
  .tcb-tablewrap table{width:max-content !important;min-width:100%;max-width:none}
  .tcb-exp-rich-body th,.tcb-exp-rich-body td,
  .tcb-tablewrap th,.tcb-tablewrap td{
    min-width:0 !important;max-width:40vw;padding:7px 9px !important;
    font-size:.86rem;line-height:1.4}
}

/* "Scroll →" affordance, added by frontend.js only when it actually scrolls */
.tcb-tablewrap.tcb-scrollable{box-shadow:inset -14px 0 12px -12px rgba(15,27,45,.28)}
.tcb-scroll-hint{display:flex;align-items:center;gap:5px;font-family:var(--disp);
  font-size:.6rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase;
  color:var(--ink-3);margin:-4px 0 9px 2px}
.tcb-scroll-hint::after{content:"→";font-size:.78rem;line-height:1;
  animation:tcbNudge 1.5s var(--ease) infinite}
@keyframes tcbNudge{0%,100%{transform:translateX(0)}50%{transform:translateX(4px)}}
@media(prefers-reduced-motion:reduce){.tcb-scroll-hint::after{animation:none}}

/* Long words in the stem/options wrap only when they truly do not fit */
.tcb-stem,.tcb-stem .tcb-sl,.tcb-stem .tcb-st,.tcb-opt-t,
.tcb-exp-rich-body,.tcb-exp-rich-body p,.tcb-exp-rich-body li{
  word-break:normal;overflow-wrap:anywhere}

/* --- unresolvable printed link: offer a way forward, not a dead end --- */
.tcb-notfound{max-width:520px;margin:26px auto;padding:30px 26px;text-align:center;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-sm)}
.tcb-nf-ic{font-size:2rem;display:block;margin-bottom:10px}
.tcb-nf-t{font-family:var(--disp);font-size:1.24rem;font-weight:800;margin:0 0 8px;color:var(--ink)}
.tcb-nf-s{color:var(--ink-2);font-size:.95rem;margin:0 0 18px}
.tcb-nf-btns{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}