/* Professional skin: loaded last, overrides tokens and key components. */
:root{
  --bg:#F3F5F9;--surface:#fff;--soft:#F7F9FC;--ink:#0F1B33;--muted:#5B6780;--line:#E1E6EF;
  --brand:#1D4ED8;--brand-ink:#fff;--hero:#0B1B3F;--accent:#0EA5A4;
  --f-display:'Inter','Segoe UI',system-ui,sans-serif;--f-body:'Inter','Segoe UI',system-ui,sans-serif;
  --sh1:0 1px 2px rgba(15,27,51,.06),0 1px 1px rgba(15,27,51,.04);
  --sh2:0 8px 24px -8px rgba(15,27,51,.18),0 2px 6px rgba(15,27,51,.06);
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--bg:#0A1120;--surface:#111A2E;--soft:#0E1627;--line:#22304D;--brand:#6EA0FF;--brand-ink:#0A1120;--accent:#2DD4BF;--sh1:none;--sh2:0 8px 24px -8px rgba(0,0,0,.6)}}
:root[data-theme="dark"]{--bg:#0A1120;--surface:#111A2E;--soft:#0E1627;--line:#22304D;--brand:#6EA0FF;--brand-ink:#0A1120;--accent:#2DD4BF;--sh1:none;--sh2:0 8px 24px -8px rgba(0,0,0,.6)}
body{background:var(--bg);font-family:var(--f-body);-webkit-font-smoothing:antialiased;letter-spacing:-.005em}
h1,h2,h3,.hero h1{font-family:var(--f-display);letter-spacing:-.025em}
.eyebrow{font:600 .72rem var(--f-body)!important;letter-spacing:.14em!important;text-transform:uppercase;color:var(--accent)!important}
/* app bar */
.appbar{background:color-mix(in srgb,var(--surface) 88%,transparent);backdrop-filter:saturate(160%) blur(10px);border-bottom:1px solid var(--line);box-shadow:var(--sh1)}
.brand{display:inline-flex;align-items:center;gap:9px;font:800 1.02rem var(--f-display);letter-spacing:-.02em}
.brand::before{content:"";width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,var(--brand),var(--accent));box-shadow:inset 0 0 0 2px rgba(255,255,255,.25)}
.ab-nav button{display:inline-flex;align-items:center;gap:8px;border-radius:10px;font-weight:600;font-size:.92rem;padding:8px 14px}
.ab-nav button svg{width:17px;height:17px;flex:none}
.ab-nav button[aria-current="true"]{background:var(--brand);color:var(--brand-ink);box-shadow:0 4px 12px -4px var(--brand)}
.ab-nav button:not([aria-current="true"]):not([aria-current="page"]):hover{background:var(--soft)}
/* surfaces */
.card,.gt-card,.hm-card,.stat,.sj{border-radius:14px;border:1px solid var(--line);box-shadow:var(--sh1);background:var(--surface)}
.card:hover,.sj:hover{box-shadow:var(--sh2)}
.btn{border-radius:10px;font-weight:600;box-shadow:0 1px 2px rgba(15,27,51,.12);transition:transform .12s,box-shadow .12s}
.btn:hover:not(:disabled){transform:translateY(-1px);box-shadow:var(--sh2)}
.btn:focus-visible,.ab-nav button:focus-visible{outline:3px solid color-mix(in srgb,var(--brand) 45%,transparent);outline-offset:2px}
input,select{border-radius:10px!important}
/* hero */
.hero{background:linear-gradient(135deg,#0B1B3F 0%,#12306E 60%,#0E5F73 100%);border-radius:0 0 22px 22px}
/* q bank */
body.view-qb #qb-view{padding-top:26px}
.qb-top h1{font-size:clamp(1.7rem,4vw,2.4rem);font-weight:800}
.qb-stats{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:12px 18px;box-shadow:var(--sh1)}
.qb-tiles{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:12px;margin-block:18px}
.qb-tile{position:relative;text-align:left;display:grid;gap:4px;padding:14px 16px 18px;border:1px solid var(--line);border-radius:14px;background:var(--surface);box-shadow:var(--sh1);cursor:pointer;font:inherit;color:inherit;overflow:hidden;transition:transform .12s,box-shadow .12s,border-color .12s}
.qb-tile:hover{transform:translateY(-2px);box-shadow:var(--sh2)}
.qb-tile.on{border-color:var(--brand);box-shadow:0 0 0 2px color-mix(in srgb,var(--brand) 35%,transparent)}
.qb-tile b{font-size:1rem;font-weight:700}.qb-tile span{font-size:.82rem;color:var(--muted)}
.qb-tile i{position:absolute;left:0;bottom:0;height:4px;width:var(--p);background:linear-gradient(90deg,var(--brand),var(--accent))}
/* exam screen: official-CBT look */
.gt-cand{background:#0B1B3F!important;color:#fff!important;border-radius:12px 12px 0 0;box-shadow:var(--sh2)}
.gt-opt{border-radius:12px;border:1.5px solid var(--line);background:var(--surface);transition:border-color .12s,background .12s}
.gt-opt:hover:not(:disabled){border-color:var(--brand);background:color-mix(in srgb,var(--brand) 6%,var(--surface))}
.gt-stem{font-size:1.06rem;line-height:1.6}
@media (max-width:640px){.ab-nav button span.t{display:none}.ab-nav button{padding:8px 10px}}
@media print{.appbar{display:none}}

/* ===== App polish (PYQ release) ===== */
.brand small{font:700 .62rem var(--f-body);letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin-left:2px;align-self:flex-end;padding-bottom:3px}
.ab-nav button[aria-current="page"]{background:var(--brand);color:var(--brand-ink);box-shadow:0 4px 12px -4px var(--brand)}
.ab-nav button:not([aria-current="page"]):hover{background:var(--soft)}
.ab-nav button[aria-current="page"]:hover{background:var(--brand);color:var(--brand-ink)}
main.wrap{animation:fadeUp .22s ease-out}
@keyframes fadeUp{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){main.wrap{animation:none}}

/* question pictures: shown exactly as supplied, never cropped */
.q-fig{margin:14px 0 18px;display:grid;justify-items:center;gap:6px}
.q-fig-img{display:block;background:#0b0f19;border:1px solid var(--line);border-radius:12px;padding:6px;max-width:100%;box-shadow:var(--sh1);cursor:zoom-in}
.q-fig-img img{display:block;max-width:100%;max-height:380px;width:auto;height:auto;object-fit:contain;border-radius:8px;background:#fff}
.q-fig figcaption{font-size:.72rem;color:var(--muted);text-align:center;max-width:62ch}
.q-fig figcaption a{color:inherit;text-decoration:underline dotted}
.gt-stem.sm + .q-fig .q-fig-img img{max-height:280px}

/* solutions */
.gt-why{border:1px solid var(--line);border-left:4px solid var(--accent);background:var(--soft);border-radius:12px;padding:14px 16px}
details.gt-why summary{cursor:pointer;list-style:none;display:flex;align-items:center;gap:8px}
details.gt-why summary::-webkit-details-marker{display:none}
details.gt-why summary::after{content:"Show";margin-left:auto;font-size:.78rem;font-weight:700;color:var(--brand)}
details.gt-why[open] summary::after{content:"Hide"}
.sol{font-size:.94rem;line-height:1.6}
.sol p{margin:6px 0}
.sol .sol-ans{font-weight:700;color:var(--ink);background:color-mix(in srgb,var(--accent) 12%,transparent);border-radius:8px;padding:6px 10px;margin:8px 0 10px}
.sol h4{margin:14px 0 4px;font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.sol ul{margin:4px 0 8px;padding-left:1.15em}
.sol li{margin:3px 0}
.sol li::marker{color:var(--accent)}

/* PYQ badges and entry points */
.gt-tag.pyq{background:linear-gradient(135deg,var(--brand),var(--accent));color:#fff;border-color:transparent}
.qb-pyqcta{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-top:18px;padding:16px 18px;border-radius:14px;background:linear-gradient(135deg,#0B1B3F,#12306E 60%,#0E5F73);color:#fff;box-shadow:var(--sh2)}
.qb-pyqcta b{display:block;font-size:1.05rem}.qb-pyqcta span{opacity:.8;font-size:.88rem}
.qb-pyqcta .btn,.pyqpanel .btn{background:#fff;color:#14275E;margin:0}
.pyqpanel{display:flex;gap:16px;align-items:center;justify-content:space-between;flex-wrap:wrap;border-radius:16px;padding:20px 22px;color:#fff;background:linear-gradient(135deg,#0E5F73,#12306E 55%,#0B1B3F);box-shadow:var(--sh2)}
.pyqpanel h2{margin:0 0 4px}.pyqpanel p{margin:0;opacity:.85;max-width:60ch}.pyqpanel .eyebrow{color:#7EE7E0!important}
body.view-pyq .qb-top .eyebrow{color:var(--brand)!important}

/* phones: app-style bottom tab bar */
@media (max-width:640px){
  .appbar{backdrop-filter:none;-webkit-backdrop-filter:none;background:var(--surface)}
  .ab-nav{position:fixed;left:0;right:0;bottom:0;z-index:40;justify-content:space-around;gap:0;padding:6px 6px calc(6px + env(safe-area-inset-bottom,0px));background:color-mix(in srgb,var(--surface) 94%,transparent);backdrop-filter:saturate(160%) blur(12px);border-top:1px solid var(--line);box-shadow:0 -6px 20px -12px rgba(15,27,51,.25)}
  .ab-nav button{flex:1;flex-direction:column;gap:2px;padding:6px 2px;border-radius:10px;font-size:.66rem}
  .ab-nav button span.t{display:block!important}
  .ab-nav button svg{width:20px;height:20px}
  .ab-nav button[aria-current="page"],.ab-nav button[aria-current="page"]:hover{background:color-mix(in srgb,var(--brand) 12%,transparent);color:var(--brand);box-shadow:none}
  .brand{display:inline-flex!important}
  .ab-in{justify-content:space-between}
  body{padding-bottom:76px}
  body:has(.gt-exam) .ab-nav{display:none}
  body:has(.gt-exam){padding-bottom:0}
}

/* tablets / narrow desktop: keep all five tabs visible */
@media (min-width:641px) and (max-width:980px){
  .brand small{display:none}
  .ab-in{gap:8px}
  .ab-nav{overflow:visible;gap:2px}
  .ab-nav button{padding:7px 9px;gap:6px;font-size:.84rem}
  .ab-nav button svg{width:15px;height:15px}
}
@media (min-width:641px) and (max-width:700px){
  .ab-nav button span.t{display:none}
  .ab-nav button{padding:8px 12px}
}