/* Green Flask Science: Exam Prep section */
.pp-head{padding-block:56px 28px;text-align:center;display:flex;flex-direction:column;align-items:center}
.pp-head h1{font-size:clamp(2.1rem,5.4vw,3.4rem);font-weight:500;letter-spacing:-.02em}
.pp-head .sub{color:var(--muted);margin-top:12px;max-width:62ch;font-size:1.08rem}
.crumb{font-size:.8rem;font-weight:600;letter-spacing:.2em;text-transform:uppercase;color:var(--apes);margin-bottom:12px}
.crumb a{text-decoration:none}
.crumb a:hover{text-decoration:underline}
.pp{max-width:780px;margin-inline:auto;padding:8px max(20px,env(safe-area-inset-left,0px)) 40px}
.pp.wide{max-width:980px}
.pp h2{font-size:clamp(1.55rem,3.2vw,2.1rem);margin:44px 0 12px;letter-spacing:-.01em}
.pp h3{font-size:1.2rem;margin:26px 0 8px;font-weight:600}
.pp p{margin:0 0 14px;color:var(--ink)}
.pp p.muted,.muted{color:var(--muted)}
.pp ul,.pp ol{margin:0 0 16px;padding-left:1.3rem}
.pp li{margin:5px 0}
.pp a{color:var(--accent)}
.pp .btn,.pp .btn:hover{color:var(--btn-ink);text-decoration:none}
.pp .btn.light{color:var(--ink)}
.facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:10px;overflow:hidden;margin:18px 0 8px}
.facts div{background:var(--bg);padding:16px 18px}
.facts b{display:block;font-size:.72rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--apes);margin-bottom:4px}
.facts span{font-size:1.02rem}
.tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:16px;margin:18px 0}
.tile{display:flex;flex-direction:column;gap:6px;padding:22px 22px 20px;border:1px solid var(--line);border-top:3px solid var(--apes);border-radius:10px;background:var(--bg);text-decoration:none;color:var(--ink)!important;transition:transform .15s,box-shadow .15s}
.tile:hover{transform:translateY(-2px);box-shadow:0 8px 28px rgba(0,0,0,.08)}
.tile .tg{font-size:.72rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--apes)}
.tile h3{margin:0;font-size:1.25rem}
.tile p{margin:0;color:var(--muted);font-size:.96rem}
.tile .go{margin-top:auto;padding-top:8px;font-weight:600;font-size:.92rem}
.note{border:1px solid var(--line);border-left:4px solid var(--apes);background:var(--panel);border-radius:8px;padding:16px 18px;margin:22px 0}
.note b.lbl{display:block;font-size:.72rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--apes);margin-bottom:4px}
.note p:last-child{margin-bottom:0}
.note.teacher{border-left-color:var(--chem)}
.note.teacher b.lbl{color:var(--chem)}
table.t{width:100%;border-collapse:collapse;margin:14px 0 20px;font-size:.96rem}
table.t th,table.t td{border-bottom:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
table.t th{font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-weight:600}
.tw{overflow-x:auto}
details.faq{border-bottom:1px solid var(--line);padding:14px 0}
details.faq summary{cursor:pointer;font-weight:500;font-size:1.05rem}
details.faq p{margin:10px 0 0;color:var(--muted)}
.eg{border:1px solid var(--line);border-radius:10px;overflow:hidden;margin:16px 0 22px}
.eg .eh{background:var(--panel);padding:10px 16px;font-size:.74rem;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.eg .eb{padding:14px 16px}
.eg .eb p{margin:0 0 8px}
.ok{color:var(--apes);font-weight:600}
.no{color:#d64545;font-weight:600}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .no{color:#ff7a7a}}

/* verbs */
.verbs{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:16px;margin:18px 0}
.verb{border:1px solid var(--line);border-radius:10px;padding:20px;background:var(--bg);scroll-margin-top:90px}
.verb h3{margin:0 0 4px;font-size:1.5rem;font-weight:600;color:var(--apes);letter-spacing:-.01em}
.verb .ask{color:var(--muted);margin:0 0 10px;font-size:.98rem}
.verb dl{margin:0}
.verb dt{font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;font-weight:600;color:var(--muted);margin-top:10px}
.verb dd{margin:2px 0 0;font-size:.97rem}
.vjump{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0 6px}
.vjump a{padding:6px 14px;border:1px solid var(--line);border-radius:999px;text-decoration:none;font-size:.92rem;font-weight:500;color:var(--ink)!important}
.vjump a:hover{background:var(--panel)}

/* drill */
.drill{border:1px solid var(--line);border-radius:12px;padding:22px;background:var(--panel);margin:18px 0}
.drill .dq{font-size:1.15rem;font-weight:500;margin:6px 0 14px}
.drill .dmeta{display:flex;justify-content:space-between;color:var(--muted);font-size:.88rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase}
.drill .opts{display:grid;gap:10px}
.drill .opt{text-align:left;padding:12px 16px;border:1.5px solid var(--line);border-radius:8px;background:var(--bg);color:var(--ink);font:inherit;cursor:pointer}
.drill .opt:hover:not(:disabled){border-color:var(--ink)}
.drill .opt.good{border-color:var(--apes);background:color-mix(in srgb,var(--apes) 14%,var(--bg))}
.drill .opt.bad{border-color:#d64545;background:color-mix(in srgb,#d64545 12%,var(--bg))}
.drill .opt:disabled{cursor:default}
.drill .fb{margin-top:14px;min-height:1.5em}
.drill .fb p{margin:0 0 10px}
.drill .dnav{display:flex;gap:12px;align-items:center;margin-top:12px;flex-wrap:wrap}

/* calculator */
.calc{display:grid;grid-template-columns:1fr 1fr;gap:22px;align-items:start;margin:20px 0}
.calc .card{border:1px solid var(--line);border-radius:12px;padding:22px;background:var(--bg)}
.calc .card h2{margin:0 0 14px;font-size:1.3rem}
.fld{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px}
.fld label{font-weight:500}
.fld small{display:block;color:var(--muted);font-weight:400}
.fld input[type=number]{width:96px;padding:10px 12px;font:inherit;font-size:1.1rem;border:1.5px solid var(--line);border-radius:8px;background:var(--bg);color:var(--ink);text-align:right}
.fld input[type=number]:focus{outline:2px solid var(--accent);outline-offset:1px}
.seg{display:flex;gap:0;border:1.5px solid var(--line);border-radius:8px;overflow:hidden;margin:6px 0 4px}
.seg label{flex:1;text-align:center;padding:9px 6px;cursor:pointer;font-size:.88rem;font-weight:500;border-right:1px solid var(--line)}
.seg label:last-child{border-right:0}
.seg input{position:absolute;opacity:0;pointer-events:none}
.seg input:checked + span{font-weight:600}
.seg label:has(input:checked){background:var(--ink);color:var(--bg)}
.seg label:has(input:focus-visible){outline:2px solid var(--accent);outline-offset:-2px}
.big{font-size:clamp(3.6rem,10vw,5.2rem);font-weight:500;line-height:1;letter-spacing:-.03em;color:var(--apes)}
.res-l{font-size:.74rem;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);font-weight:600}
.meter{position:relative;height:14px;border-radius:7px;background:var(--panel);border:1px solid var(--line);margin:34px 0 28px}
.meter .fill{position:absolute;inset:0 auto 0 0;border-radius:7px;background:var(--apes);width:0;transition:width .35s}
.meter .mk{position:absolute;top:-8px;bottom:-8px;width:2px;background:var(--ink);opacity:.55}
.meter .mk i{position:absolute;top:-20px;left:50%;transform:translateX(-50%);font-style:normal;font-size:.8rem;font-weight:600}
.split2{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:14px}
.split2 div{background:var(--panel);border-radius:8px;padding:12px 14px}
.split2 b{display:block;font-size:1.35rem;font-weight:500}
.advice{margin-top:16px;padding:14px 16px;border-radius:8px;border:1px solid var(--line);background:var(--panel)}
.advice p{margin:0 0 8px}
.advice p:last-child{margin:0}
.cta{margin:46px 0 10px;padding:30px 24px;border-radius:14px;text-align:center;background:radial-gradient(ellipse at 50% 100%,#0e3a2b 0%,#06110d 70%);color:#fff}
.cta h2{margin:0 0 8px!important;color:#fff}
.cta p{color:#b9cfc4!important;max-width:54ch;margin:0 auto 18px!important}
.cta .actions{margin-top:0}
.cta .btn{background:#fff;color:#06110d!important;border-color:#fff}
.cta .btn.light{background:transparent;color:#fff!important;border-color:rgba(255,255,255,.45)}
@media (max-width:760px){
  .calc{grid-template-columns:1fr}
  .pp-head{padding-block:36px 16px}
  .verbs{grid-template-columns:1fr}
}

/* ===== v2: interactive components ===== */
.lead{font-size:1.1rem;color:var(--muted);max-width:56ch;margin:0 0 18px}
.pp h2.sec{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap}
.pp h2.sec small{font-size:.9rem;font-weight:400;color:var(--muted)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0}
.chip{padding:8px 16px;border:1.5px solid var(--line);border-radius:999px;background:var(--bg);color:var(--ink);font:inherit;font-size:.95rem;font-weight:500;cursor:pointer;transition:background .15s,border-color .15s,color .15s}
.chip:hover{border-color:var(--ink)}
.chip[aria-selected="true"],.chip[aria-pressed="true"]{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.panelx{border:1px solid var(--line);border-radius:14px;background:var(--bg);padding:22px;margin:12px 0 22px}
.panelx.tint{background:var(--panel)}
.big-word{font-size:clamp(2rem,6vw,3rem);font-weight:500;letter-spacing:-.02em;color:var(--apes);line-height:1}
.pill{display:inline-block;padding:3px 10px;border-radius:999px;font-size:.78rem;font-weight:600;letter-spacing:.04em}
.pill.g{background:color-mix(in srgb,var(--apes) 18%,transparent);color:var(--apes)}
.pill.r{background:color-mix(in srgb,#d64545 16%,transparent);color:#d64545}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .pill.r{color:#ff8a8a}}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media (max-width:640px){.row2{grid-template-columns:1fr}}
.seg2{display:inline-flex;border:1.5px solid var(--line);border-radius:999px;overflow:hidden}
.seg2 button{border:0;background:transparent;color:var(--ink);font:inherit;font-weight:500;padding:8px 20px;cursor:pointer}
.seg2 button[aria-pressed="true"]{background:var(--ink);color:var(--bg)}
.resp{margin-top:14px;padding:16px 18px;border-radius:10px;border:1.5px dashed var(--line);min-height:4.5em;font-size:1.05rem;transition:border-color .2s,background .2s}
.resp.strong{border:1.5px solid var(--apes);background:color-mix(in srgb,var(--apes) 8%,var(--bg))}
.resp.weak{border:1.5px solid #d64545;background:color-mix(in srgb,#d64545 7%,var(--bg))}
mark{background:none;color:inherit;border-radius:4px;padding:1px 4px}
mark.d{background:color-mix(in srgb,var(--accent) 24%,transparent)}
mark.c{background:color-mix(in srgb,var(--apes) 26%,transparent)}
mark.u{background:color-mix(in srgb,#e0a21a 32%,transparent)}
.legend{display:flex;gap:14px;flex-wrap:wrap;font-size:.84rem;color:var(--muted);margin-top:10px}
.legend span::before{content:"";display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:6px;vertical-align:-1px;background:var(--c)}
.rng{display:grid;gap:4px;margin-bottom:16px}
.rng .top{display:flex;justify-content:space-between;align-items:baseline;gap:10px}
.rng .top label{font-weight:500}
.rng .top label small{color:var(--muted);font-weight:400;margin-left:6px}
.rng .val{font-size:1.5rem;font-weight:500;font-variant-numeric:tabular-nums}
.rng input[type=range]{width:100%;accent-color:var(--apes);height:28px;margin:0}
.gauge{width:100%;max-width:340px;margin:0 auto;display:block}
.gauge .seg{fill:none;stroke-width:18}
.gauge .needle{transition:transform .5s cubic-bezier(.3,1.4,.5,1);transform-origin:100px 100px}
.gauge text{fill:var(--ink);font-family:inherit}
.gscore{font-size:38px;font-weight:500;text-anchor:middle}
.gsmall{font-size:7px;text-anchor:middle;fill:var(--muted)!important;letter-spacing:.14em;text-transform:uppercase}
.stk{display:flex;height:34px;border-radius:8px;overflow:hidden;background:var(--panel);border:1px solid var(--line);margin:8px 0}
.stk i{display:flex;align-items:center;padding-left:10px;font-style:normal;font-size:.8rem;font-weight:600;color:#fff;white-space:nowrap;overflow:hidden;transition:width .4s}
.stk .m{background:var(--apes)}
.stk .f{background:var(--chem)}
.stkl{display:flex;justify-content:space-between;font-size:.84rem;color:var(--muted)}
.cd{display:grid;grid-template-columns:auto 1fr;gap:6px 22px;align-items:center}
.cd .num{font-size:clamp(3.4rem,12vw,5.6rem);font-weight:500;letter-spacing:-.03em;line-height:.9;color:var(--apes);font-variant-numeric:tabular-nums}
.cd .lbl{color:var(--muted);font-size:1rem}
.cd .lbl b{display:block;color:var(--ink);font-size:1.2rem;font-weight:500}
.tile .ic{width:40px;height:40px;color:var(--apes);margin-bottom:4px}
.ring{--p:0;width:74px;height:74px;border-radius:50%;background:conic-gradient(var(--apes) calc(var(--p)*1%),var(--line) 0);display:grid;place-items:center;flex:none;transition:background .3s}
.ring span{width:58px;height:58px;border-radius:50%;background:var(--bg);display:grid;place-items:center;font-weight:600;font-variant-numeric:tabular-nums}
.sent{display:block;width:100%;text-align:left;padding:12px 16px;margin:8px 0;border:1.5px solid var(--line);border-radius:10px;background:var(--bg);color:var(--ink);font:inherit;cursor:pointer;transition:border-color .15s,background .15s}
.sent:hover:not([disabled]){border-color:var(--ink)}
.sent .why{display:none;margin-top:8px;font-size:.92rem;color:var(--muted)}
.sent.open .why{display:block}
.sent.ok{border-color:var(--apes);background:color-mix(in srgb,var(--apes) 9%,var(--bg))}
.sent.bad{border-color:#d64545;background:color-mix(in srgb,#d64545 8%,var(--bg))}
.sent .tagv{float:right;margin-left:10px}
.sortrow{display:grid;grid-template-columns:1fr auto;gap:8px 14px;align-items:center;padding:12px 0;border-bottom:1px solid var(--line)}
.sortrow:last-child{border-bottom:0}
.sortrow .opts{display:flex;gap:6px;flex-wrap:wrap}
.sortrow .opts button{padding:6px 12px;border:1.5px solid var(--line);border-radius:8px;background:var(--bg);color:var(--ink);font:inherit;font-size:.86rem;cursor:pointer}
.sortrow .opts button:hover:not(:disabled){border-color:var(--ink)}
.sortrow .opts button.good{border-color:var(--apes);background:color-mix(in srgb,var(--apes) 16%,var(--bg))}
.sortrow .opts button.bad{border-color:#d64545;background:color-mix(in srgb,#d64545 12%,var(--bg))}
.sortrow .fbk{grid-column:1/-1;font-size:.9rem;color:var(--muted);min-height:0}
@media (max-width:640px){.sortrow{grid-template-columns:1fr}}
.chart{width:100%;max-width:560px;display:block;margin:6px auto}
.chart .bar{cursor:pointer;fill:var(--chem);transition:fill .15s,opacity .15s}
.chart .bar.sel{fill:var(--apes)}
.chart:has(.sel) .bar:not(.sel){opacity:.55}
.chart text{fill:var(--ink);font-family:inherit;font-size:11px}
.chart .ax{stroke:var(--line)}
.chart .mt{fill:var(--muted)}
.step{display:flex;gap:12px;align-items:flex-start;padding:12px 14px;border:1px solid var(--line);border-radius:10px;margin:8px 0;background:var(--bg);animation:pop .35s ease}
.step .n{flex:none;width:28px;height:28px;border-radius:50%;background:var(--apes);color:#fff;display:grid;place-items:center;font-weight:600;font-size:.9rem}
.step .m{font-variant-numeric:tabular-nums}
.step .m s{text-decoration:line-through;color:var(--muted);text-decoration-thickness:2px}
@keyframes pop{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){.step{animation:none}.gauge .needle{transition:none}}
.out{font-size:1.5rem;font-weight:500;font-variant-numeric:tabular-nums;color:var(--apes)}
.out small{display:block;font-size:.8rem;color:var(--muted);font-weight:400}
.inl{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.inl input[type=number]{width:110px;padding:8px 10px;font:inherit;border:1.5px solid var(--line);border-radius:8px;background:var(--bg);color:var(--ink);text-align:right}
.tl{display:flex;height:40px;border-radius:8px;overflow:hidden;border:1px solid var(--line);margin:8px 0;background:var(--panel)}
.tl i{display:flex;align-items:center;justify-content:center;font-style:normal;font-weight:600;font-size:.85rem;color:#fff;transition:width .25s;min-width:0;overflow:hidden}
.tl .a{background:var(--apes)}.tl .b{background:var(--chem)}.tl .c{background:#e0a21a}.tl .r{background:var(--panel);color:var(--muted)}
.minisum{font-size:.95rem;color:var(--muted)}
.hint{font-size:.88rem;color:var(--muted);margin:6px 0 0}
details.more{border:1px solid var(--line);border-radius:10px;padding:2px 16px;margin:14px 0}
details.more summary{cursor:pointer;padding:12px 0;font-weight:500}
details.more[open] summary{border-bottom:1px solid var(--line);margin-bottom:10px}
.fcount{color:var(--muted);font-size:.9rem}
.dnav{display:flex;gap:12px;align-items:center;margin-top:12px;flex-wrap:wrap}
select{padding:8px 12px;font:inherit;border:1.5px solid var(--line);border-radius:8px;background:var(--bg);color:var(--ink);max-width:100%}
.tile .ic{display:block}
@media (max-width:760px){.calc .card:nth-child(2){order:-1}}

/* contrast patch (WCAG AA) */
.crumb,.crumb a,.tile .tg,.u1hero .tn,.ucard .tn,.act h2 .no,.out,.num,.units .live .st,.pill.g,.missions li.ok,.sec small b{color:#0b7a42!important}
.crumb a:hover{text-decoration:underline}
.stk i.m,.tl i.a,.stk i.a{background:#0b7a42;color:#fff}
.stk i.f{background:#6a4bd6;color:#fff}
.pill.r{color:#9c2323}
.note a,.hint a,.pp p a:not(.btn){color:#1f47b0}
.tcta,.tcta b,.tcta span,.tcta i{color:#fff!important}
@media (prefers-color-scheme:dark){
 :root:not([data-theme="light"]) .crumb,:root:not([data-theme="light"]) .crumb a,:root:not([data-theme="light"]) .tile .tg,:root:not([data-theme="light"]) .ucard .tn,:root:not([data-theme="light"]) .act h2 .no,:root:not([data-theme="light"]) .out,:root:not([data-theme="light"]) .num,:root:not([data-theme="light"]) .units .live .st,:root:not([data-theme="light"]) .pill.g,:root:not([data-theme="light"]) .missions li.ok{color:#3ddc84!important}
 :root:not([data-theme="light"]) .stk i.m,:root:not([data-theme="light"]) .tl i.a,:root:not([data-theme="light"]) .stk i.a{background:#3ddc84;color:#08150d}
 :root:not([data-theme="light"]) .stk i.f{background:#9a8cff;color:#10102a}
 :root:not([data-theme="light"]) .pill.r{color:#ff9a9a}
 :root:not([data-theme="light"]) .note a,:root:not([data-theme="light"]) .hint a,:root:not([data-theme="light"]) .pp p a:not(.btn){color:#8fb0ff}
}

.stk i.b,.stk i.c,.tl i.b,.tl i.c,.tl i.f{color:#14201a!important}
.stk i.c,.tl i.c{background:#f2b632!important}.stk i.b,.tl i.b{background:#b9aefc!important}
@media (prefers-color-scheme:light){.pill.g{background:#e3f5ec}}
@media (prefers-color-scheme:dark){.pill.g{background:rgba(61,220,132,.16)!important}}
.big-word{color:#0b7a42!important}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .big-word{color:#3ddc84!important}
 :root:not([data-theme="light"]) .lv{color:#08150d!important}}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) b[style*="3e6ae1"]{color:#8fb0ff!important}}
.lv{--apes:#0b7a42}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) b[style*="d64545"]{color:#ff8a8a!important}}
b[style*="e0a21a"]{color:#8a5d00!important}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .lv{--apes:#3ddc84}:root:not([data-theme="light"]) b[style*="e0a21a"]{color:#f2b632!important}}
b[style*="3e6ae1"]{color:#2a52c4!important}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) b[style*="3e6ae1"]{color:#8fb0ff!important}}
b[style*="d64545"]{color:#b52f2f!important}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) b[style*="d64545"]{color:#ff8a8a!important}}