/* StudyBrix 0.9: worksheet builder restyled on the shared brand (brand.css). Loaded after styles.css and redesign.css. */
:root{--ink:#1b2238;--muted:#5b6680;--blue:#2140c4;--blue-light:#eef1fc;--line:#dfe4ee;--soft:#f6f8fc;--radius:14px;--shadow:none;font-family:var(--font-body);color:var(--ink)}
html,body{font-family:var(--font-body)}
body{background:#fff;color:var(--ink);font-size:16px}
h1,h2,h3,.section-heading h2,.picker-title h2,.panel-heading h2{font-family:var(--font-display);letter-spacing:-.015em;color:var(--ink)}
button,input,select,textarea{font-family:inherit}
:focus-visible{outline:3px solid var(--pencil);outline-offset:2px}
::selection{background:var(--pencil-wash)}

/* Buttons: ballpoint blue with a pressed edge, plain secondary buttons, text links. */
.btn{border-radius:10px;min-height:44px;padding:10px 16px;font-size:15px;font-weight:650;border:1.5px solid var(--line-2);color:var(--ink);background:#fff;gap:8px}
.btn:hover{border-color:var(--ink-3);background:#fff}
.btn.primary{background:var(--pen);border-color:var(--pen-deep);color:#fff;box-shadow:var(--press)}
.btn.primary:hover{background:var(--pen-deep)}
.btn.primary:active{transform:translateY(2px);box-shadow:none}
.btn.big{min-height:52px;padding:12px 22px;font-size:16px;border-radius:12px}
.btn.small{min-height:38px;font-size:14px;padding:7px 12px}
.btn.ghost{border-color:transparent;background:transparent}
.btn.ghost:hover{background:var(--desk)}
.btn .icon{width:18px;height:18px}
.link-btn{display:inline-flex;align-items:center;gap:7px;background:none;border:0;padding:6px 2px;color:var(--pen);font:inherit;font-weight:650;font-size:15px;cursor:pointer;text-decoration:underline;text-decoration-color:color-mix(in srgb,var(--pen) 35%,transparent);text-underline-offset:4px}
.link-btn:hover{text-decoration-color:var(--pen)}
.link-btn .icon{width:17px;height:17px}

/* Header */
.app-header{height:70px;border-bottom:1.5px solid var(--line);background:#fff}
.brand{gap:11px;min-width:240px}
.brand .bx-logo{width:38px;height:34px}
.brand b{font-size:22px;letter-spacing:-.02em}
.brand small{font-size:13px;color:var(--ink-3);letter-spacing:0;margin-top:1px}
.header-center{display:none}
.language-select{font-size:15px}
.app-header .header-right .btn{min-height:42px;font-size:15px}

/* Sidebar: quiet, sentence case. */
.sidebar{background:#fff;border-right:1.5px solid var(--line)}
.side-label{font-size:13px;letter-spacing:0;text-transform:none;color:var(--ink-3);font-weight:650}
.nav-btn{font-size:15px;color:var(--ink-2);border-radius:9px;min-height:42px}
.nav-btn:hover{background:var(--desk);color:var(--ink)}
.nav-btn.active{background:var(--pen-wash);color:var(--pen);box-shadow:inset 3px 0 0 var(--pen);font-weight:650}
.nav-subject{font-size:14px;min-height:36px}
.new-mark{display:none}
.side-note{background:var(--pencil-wash);border:1.5px solid #f3dc9a;border-radius:var(--r)}
.side-note b{font-family:var(--font-display);font-size:16px}
.side-note p{font-size:14px;color:var(--ink-2);line-height:1.5}
.side-note .icon{color:#a87708}

/* Hero: the worksheet itself. */
.workspace-hero{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(320px,.85fr);gap:40px;align-items:center;padding:34px 38px;min-height:0;border:1.5px solid var(--line);border-radius:var(--r-l);background:var(--desk);overflow:visible}
.workspace-hero h1{font-family:var(--font-display);font-size:clamp(34px,3.4vw,54px);line-height:1.04;letter-spacing:-.03em;font-weight:780;margin:0 0 16px;max-width:15ch}
.hero-copy>p b{color:var(--ink);font-weight:700}
.hero-copy>p{font-size:17px;line-height:1.6;color:var(--ink-2);max-width:56ch;margin:0 0 22px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap}
.hero-links{display:flex;flex-wrap:wrap;gap:4px 18px;margin:18px 0 0!important}
.hero-copy .hero-footnote{display:block;font-size:14px;color:var(--ink-3);margin:10px 0 0!important}
.hero-visual{position:relative;min-height:0;display:block;transform:none!important;max-width:440px;justify-self:end;width:100%}
.hero-sheet{position:relative;padding:32px 26px 80px 64px;border-radius:6px;box-shadow:0 1px 0 #d8dfec,0 18px 34px -18px rgba(27,34,56,.35);transform:rotate(1.6deg);font-size:15px;line-height:32px}
.sheet-head{display:flex;margin-top:-32px;justify-content:space-between;gap:12px;color:var(--ink-3);font-size:13px}
.hand.ink{color:var(--pen);font-size:23px;font-weight:600;line-height:1}
.sheet-title{font-family:var(--font-display);font-weight:700;font-size:18px;margin:0;color:var(--ink)}
.sheet-q{display:flex;align-items:baseline;gap:8px;position:relative;min-height:32px}
.sheet-n{color:var(--ink-3);width:18px;flex-shrink:0}
.sheet-p{color:var(--ink)}
.sheet-a{margin-left:4px;font-size:26px}
.tick{position:absolute;left:-52px;top:2px;width:34px;height:28px;fill:none;stroke:var(--redpen);stroke-width:3.4;stroke-linecap:round;stroke-linejoin:round}
.sheet-score{position:absolute;right:18px;bottom:8px;color:var(--redpen);font-size:26px;transform:rotate(-7deg);display:flex;align-items:center;gap:8px}
.sheet-score span{display:inline-grid;place-items:center;width:58px;height:44px;border:2.5px solid var(--redpen);border-radius:50% 46% 52% 48%;font-size:26px}
.hero-pencil{position:absolute;width:230px;left:-26px;bottom:-30px;transform:rotate(-5deg);filter:drop-shadow(0 6px 6px rgba(27,34,56,.18))}
@media(prefers-reduced-motion:no-preference){
 .tick path{stroke-dasharray:60;stroke-dashoffset:60;animation:sb-draw .45s ease-out forwards}
 .sheet-q:nth-of-type(2) .tick path{animation-delay:.35s}.sheet-q:nth-of-type(3) .tick path{animation-delay:.7s}.sheet-q:nth-of-type(4) .tick path{animation-delay:1.05s}
 .sheet-score{animation:sb-fade .35s 1.5s both}
}
@keyframes sb-draw{to{stroke-dashoffset:0}}
@keyframes sb-fade{from{opacity:0;transform:rotate(-7deg) scale(.92)}to{opacity:1;transform:rotate(-7deg)}}

/* Tabs, subjects, grades, steps */
.mode-tabs{border-bottom:1.5px solid var(--line);gap:26px}
.mode-tab{font-size:15px;color:var(--ink-2);font-weight:600}
.mode-tab small{font-size:12px;background:var(--desk);color:var(--ink-3)}
.mode-tab.active{color:var(--pen);border-color:var(--pen)}
.mode-tab.active small{background:var(--pen-wash);color:var(--pen)}
.section-heading h2{font-size:20px;font-weight:720}
.section-heading>span{font-size:14px;color:var(--ink-3)}
.subject-tile{border:1.5px solid var(--line);border-radius:12px;background:#fff;min-width:132px;max-width:160px;padding:14px}
.subject-tile b{font-size:14px;color:var(--ink);font-weight:650}
.subject-tile small{font-size:12px;color:var(--ink-3)}
.subject-tile:hover{border-color:var(--ink-3)}
.subject-tile.active{border-color:var(--pen);background:var(--pen-wash);box-shadow:inset 0 -3px 0 var(--pen)}
.grade-label{font-size:14px!important;color:var(--ink-2);font-weight:600}
.grade-chip{border:1.5px solid var(--line);border-radius:9px;color:var(--ink-2);font-size:14px;height:38px;min-width:40px;font-weight:600}
.grade-chip:hover{border-color:var(--ink-3)}
.grade-chip.active{background:var(--pen);border-color:var(--pen-deep);color:#fff;box-shadow:var(--press)}
.steps{border:1.5px solid var(--line);border-radius:var(--r)}
.step{font-size:14px;color:var(--ink-3)}
.step.active{color:var(--ink);font-weight:650}
.step-num{border-width:1.5px}
.step.active .step-num{background:var(--pen);border-color:var(--pen)}

/* Question bank */
.picker{border:1.5px solid var(--line);border-radius:var(--r-l);box-shadow:none}
.picker-title h2{font-size:24px;font-weight:760}
.picker-title small{font-size:14px;color:var(--ink-3)}
.filter-grid label,.field label{font-size:13px;color:var(--ink-2);font-weight:650}
.filter-grid select,.field select,.field input,.search-field input{font-size:15px;border:1.5px solid var(--line);border-radius:9px;min-height:44px;color:var(--ink)}
.results-bar{font-size:14px;background:var(--desk);border-color:var(--line)}
.results-bar label,.results-bar select{font-size:14px}
.qcard{border:1.5px solid var(--line);border-radius:12px;box-shadow:none}
.qcard:hover{border-color:var(--ink-3);box-shadow:none}
.qcard.selected{border-color:var(--pen);box-shadow:inset 4px 0 0 var(--pen);background:#fbfcff}
.qcard.selected .q-select{background:var(--pen);border-color:var(--pen)}
.qprompt{font-size:16px;line-height:1.5;color:var(--ink)}
.question-tag{font-size:13px;color:var(--ink-3)}
.qmeta{font-size:13px;color:var(--ink-3)}
.qchoices span,.qchoices li{font-size:14px}
.qcard-footer{font-size:14px}
.answer-btn,.qcard-footer .btn{font-size:14px}
.pagination,.page-btn{font-size:14px}
.picker-hint,.content-note{font-size:14px;color:var(--ink-3)}

/* Worksheet panel (right) */
.selection-panel{border:1.5px solid var(--line);border-top:4px solid var(--pen);border-radius:var(--r-l);box-shadow:none}
.panel-heading h2{font-size:20px}
.selection-empty{font-size:15px;color:var(--ink-3)}
.mini-item{font-size:14px}
.right-note{font-size:13px;color:var(--ink-3)}
.sticky-actions,.selection-sticky{font-size:14px}

/* Resources */
.resource-card{border:1.5px solid var(--line);border-radius:14px;box-shadow:none}
.resource-card:hover{border-color:var(--ink-3);box-shadow:none;transform:none}
.resource-kind{font-size:13px!important;letter-spacing:0!important;text-transform:none!important;font-weight:650}
.resource-card h3{font-family:var(--font-display);font-size:19px}
.resource-card p,.resource-meta{font-size:14px}
.formula-preview{font-family:var(--font-body)!important;font-size:19px!important}
.resource-intro h1{font-family:var(--font-display);font-weight:760;letter-spacing:-.03em}
.resource-intro p{font-size:17px;color:var(--ink-2)}
.eyebrow{text-transform:none;letter-spacing:0;font-size:14px}
.resource-intro .eyebrow b,.eyebrow b{text-transform:none}

/* Practice */
.practice-card{border:1.5px solid var(--line);border-radius:var(--r-l);box-shadow:none}
.practice-question{font-family:var(--font-display);font-size:clamp(22px,2.4vw,30px);font-weight:600}
.page-kicker{text-transform:none!important;letter-spacing:0!important;font-size:15px!important;color:var(--pen)!important}
.small-label{font-size:14px!important}
.practice-progress div{background:var(--pen)}
.feedback.good{color:var(--tick)}.feedback.bad{color:var(--redpen)}

/* Worksheet ready + answer key (centre stage) */
body.ready-active .builder-layout{display:none}
.ready-page{max-width:940px;margin:0 auto;padding:6px 0 10px}
.ready-head{text-align:center;padding:26px 20px 24px;border-bottom:1.5px dashed var(--line-2);margin-bottom:26px}
.ready-kicker{display:inline-flex;align-items:center;gap:8px;margin:0 0 6px;color:var(--tick);font-weight:700;font-size:16px}
.ready-kicker .icon{width:20px;height:20px}
.ready-head h1{font-size:clamp(28px,3vw,42px);font-weight:780;letter-spacing:-.03em;margin:4px 0 8px}
.ready-meta{display:flex;justify-content:center;flex-wrap:wrap;gap:6px 18px;color:var(--ink-2);font-size:15px;margin:0 0 22px}
.ready-meta span+span::before{content:"";display:inline-block;width:5px;height:5px;border-radius:50%;background:var(--line-2);margin-right:18px;vertical-align:middle}
.ready-actions{display:flex;justify-content:center;flex-wrap:wrap;gap:12px}
.key-btn{border-color:var(--redpen)!important;color:var(--redpen)!important}
.key-btn:hover{background:#fff4f2!important}
.key-btn .icon{color:var(--redpen)}
.ready-more{display:flex;justify-content:center;flex-wrap:wrap;gap:4px 22px;margin:16px 0 0}
.ready-paper{background:var(--desk);border:1.5px solid var(--line);border-radius:var(--r-l);padding:26px;display:flex;justify-content:center}
.ready-frame{width:100%;max-width:840px;min-height:600px;border:0;background:#fff;border-radius:4px;box-shadow:0 1px 0 #d8dfec,0 18px 34px -20px rgba(27,34,56,.4)}
.key-page .ready-head{border-bottom:0;margin-bottom:8px}
.key-status{font-size:17px;color:var(--ink-2);margin:0 0 14px}
.key-status b{font-family:var(--font-display);font-size:22px;color:var(--ink)}
.key-bar{height:6px;max-width:360px;margin:0 auto 22px;border-radius:6px;background:var(--desk);overflow:hidden}
.key-bar i{display:block;height:100%;width:100%;background:var(--redpen);transform-origin:left;animation:sb-bar linear forwards}
@keyframes sb-bar{from{transform:scaleX(0)}to{transform:scaleX(1)}}
.key-page .ad{max-width:640px;margin:10px auto 0}

/* Footer, modal, toast */
.page-footer{font-size:14px;color:var(--ink-3);border-top:1.5px solid var(--line)}
.footer-links button{font-size:14px;color:var(--ink-2)}
dialog .modal-head h2{font-family:var(--font-display);font-size:24px}
dialog .modal-head p,.form-help,.muted{font-size:15px}
#toast{font-family:var(--font-body);font-size:15px;background:var(--ink);border-radius:10px}
.boot .bx-logo{width:64px;height:56px}
.boot h1{font-family:var(--font-display)}

@media(max-width:1100px){.workspace-hero{grid-template-columns:1fr 300px;gap:24px;padding:28px}.hero-pencil{width:190px}}
@media(max-width:760px){
 .workspace-hero{grid-template-columns:1fr;padding:22px 18px 30px;gap:26px}
 .workspace-hero h1{font-size:34px}
 .hero-copy>p{font-size:16px}
 .hero-cta .btn{flex:1 1 100%}
 .hero-visual{max-width:340px;justify-self:center}
 .hero-sheet{font-size:14px;padding-left:56px}
 .brand{min-width:0}.brand small{display:none}
 .ready-head{padding:12px 4px 20px}
 .ready-actions .btn{flex:1 1 100%}
 .ready-paper{padding:10px;border-radius:12px}
}
@media(prefers-reduced-motion:reduce){.key-bar i{animation:none}}
@media print{.ready-head,.ready-more,.ad{display:none!important}}
dialog .field label,dialog .toggle-line,dialog .quota-row{font-size:14px;color:var(--ink-2);font-weight:650}
dialog .field input,dialog .field select{font-size:15px;min-height:44px;border:1.5px solid var(--line);border-radius:9px}
dialog .field select:disabled{background:var(--desk);color:var(--ink-3)}
.ready-paper{position:relative}
.ready-loading{position:absolute;top:60px;left:0;right:0;text-align:center;font-family:var(--font-hand);font-size:28px;color:var(--pen);margin:0;z-index:1;pointer-events:none}

/* ---- Home: one task above the fold ---- */
body.home-active .sidebar,body.home-active .header-right .icon-btn{display:none}
body.home-active .main{margin-left:0;max-width:1180px;margin-inline:auto;padding:40px 32px 24px}
.home-hero{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(300px,.9fr);gap:56px;align-items:center;padding:12px 0 48px}
.home h1{font-family:var(--font-display);font-size:clamp(38px,4.4vw,62px);line-height:1.02;letter-spacing:-.035em;font-weight:790;margin:0 0 14px;max-width:13ch}
.home-lead{font-size:20px;color:var(--ink-2);margin:0 0 28px}
.quick-form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px 14px;padding:22px;border:1.5px solid var(--line);border-radius:var(--r-l);background:#fff;box-shadow:0 1px 0 var(--line)}
.quick-form .field{display:grid;gap:6px;margin:0}
.quick-form label{font-size:14px;font-weight:700;color:var(--ink-2)}
.quick-form select{width:100%;min-height:48px;font-size:16px;border:1.5px solid var(--line-2);border-radius:10px;padding:0 12px;background:#fff;color:var(--ink)}
.quick-form select:disabled{background:var(--desk);color:var(--ink-3)}
.quick-form .quick-go{grid-column:1/-1;width:100%;min-height:56px;font-size:18px}
.quick-form .notice{grid-column:1/-1}
.home .hero-visual{justify-self:center;max-width:430px}
.home-doors{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;padding-top:36px;border-top:1.5px dashed var(--line-2)}
.door{display:flex;gap:14px;align-items:flex-start;text-align:left;padding:18px 18px;border:1.5px solid var(--line);border-radius:var(--r);background:#fff;color:var(--ink);font:inherit;cursor:pointer;text-decoration:none}
.door:hover{border-color:var(--ink);text-decoration:none}
.door .icon{width:24px;height:24px;flex-shrink:0;color:var(--pen);margin-top:2px}
.door b{display:block;font-family:var(--font-display);font-size:19px;font-weight:720;margin-bottom:3px}
.door small{display:block;font-size:15px;color:var(--ink-3);line-height:1.45}
.home .ad{margin-top:36px}
@media(max-width:900px){.home-hero{grid-template-columns:1fr;gap:30px;padding-bottom:36px}.home .hero-visual{max-width:360px}.home-doors{grid-template-columns:1fr}}
@media(max-width:520px){body.home-active .main{padding:22px 16px}.home h1{font-size:36px}.home-lead{font-size:17px}.quick-form{grid-template-columns:1fr;padding:16px}.home .hero-visual{display:none}}

/* ---- Top navigation (was the sidebar "Library" list) ---- */
.app-header{gap:18px}
.top-nav{display:flex;align-items:center;gap:2px;flex:1;min-width:0;justify-content:center}
.top-link{display:inline-flex;align-items:center;gap:7px;padding:9px 12px;border-radius:9px;border:0;background:none;color:var(--ink-2);font:inherit;font-size:15px;font-weight:650;white-space:nowrap;cursor:pointer;text-decoration:none}
.top-link:hover{background:var(--desk);color:var(--ink);text-decoration:none}
.top-link.active{color:var(--pen);background:var(--pen-wash)}
.top-link .icon{width:18px;height:18px}
.sidebar .side-label:first-child{margin-top:4px}
@media(max-width:1560px){.top-link .icon{display:none}.brand small{display:none}.brand{min-width:0}.top-nav{justify-content:flex-start}}

@media(max-width:1180px){.top-link{padding:8px 8px;font-size:14px}.language-wrap .icon{display:none}}
@media(max-width:1180px){
 .app-header{flex-wrap:wrap;height:auto!important;padding:10px 14px 0!important;row-gap:4px}
 .top-nav{order:3;flex:1 1 100%;justify-content:flex-start;overflow-x:auto;scrollbar-width:none;margin:0 -6px;padding-bottom:6px}
 .top-nav::-webkit-scrollbar{display:none}
 .sidebar{top:102px}
}

/* ---- Home: ready-made worksheets + study material ---- */
.home-block{padding:34px 0 6px;border-top:1.5px dashed var(--line-2)}
.home-block-head{display:flex;justify-content:space-between;align-items:baseline;gap:16px;flex-wrap:wrap}
.home-block h2{font-size:28px;font-weight:760;letter-spacing:-.02em;margin:0}
.home-block-note{color:var(--ink-2);font-size:16px;margin:6px 0 16px}
.grade-pills{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 18px}
.grade-pills a{display:inline-grid;place-items:center;min-width:44px;height:44px;padding:0 12px;border:1.5px solid var(--line-2);border-radius:10px;color:var(--ink);font-weight:700;text-decoration:none}
.grade-pills a:hover{border-color:var(--pen);color:var(--pen)}
.premade-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;min-height:76px}
.premade-card{--accent:var(--pen);display:flex;gap:12px;align-items:flex-start;padding:14px 15px;border:1.5px solid var(--line);border-radius:12px;background:#fff;color:var(--ink);text-decoration:none}
.premade-card:hover{border-color:var(--ink);text-decoration:none}
.premade-card b{display:block;font-family:var(--font-display);font-size:16px;font-weight:700;line-height:1.25}
.premade-card small{display:block;color:var(--ink-3);font-size:14px;margin-top:3px}
.premade-icon{display:grid;place-items:center;width:38px;height:38px;flex-shrink:0;border-radius:10px;color:var(--accent);background:color-mix(in srgb,var(--accent) 11%,#fff)}
.premade-icon .icon{width:20px;height:20px}
.premade-card.blue{--accent:#2f5fd0}.premade-card.pink{--accent:#c4588a}.premade-card.teal{--accent:#2a8a80}.premade-card.amber{--accent:#a2761c}.premade-card.orange{--accent:#c0652e}.premade-card.violet{--accent:#7b55c4}.premade-card.cyan{--accent:#2a84a6}
.home .home-doors{grid-template-columns:repeat(4,minmax(0,1fr));padding-top:4px;border-top:0}
.home-alt{margin:18px 0 0}
@media(max-width:1100px){.premade-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.home .home-doors{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:560px){.premade-grid,.home .home-doors{grid-template-columns:1fr}.home-block h2{font-size:24px}}

/* ---- Side ads on every page except home ---- */
/* Left: pinned to the bottom of the subject sidebar while the list scrolls above it. */
.sidebar .ad-side{position:sticky;bottom:-20px;margin:auto -13px -20px;padding:10px 13px 14px;background:#fff;border-top:1.5px solid var(--line);text-align:left}
.sidebar .ad-side ins{min-height:200px}
/* Right: a fixed 160 px column for views without their own right column (guides, sheets, ready, answer key, practice). */
.page-rail{display:none}
@media(min-width:1181px){
 body.rail-on .page-rail{display:block;position:fixed;right:18px;top:96px;width:160px;z-index:5}
 body.rail-on .page-rail .ad{margin:0}
 body.rail-on .page-rail ins{min-height:600px;width:160px}
 body.rail-on .main{margin-right:196px}
}
@media(max-width:1180px){.sidebar .ad-side{display:none}}
body.home-active .page-rail,body.home-active .sidebar .ad-side{display:none!important}
body.rail-on:has(.page-rail .ad-collapsed) .main{margin-right:0}
body.rail-on .page-rail:has(.ad-collapsed){display:none!important}

/* 0.9.5: the whole card opens the guide, sheet or preset, not only its button. The button's ::after covers the card,
   so a click anywhere is a click on the real button (keyboard focus and screen readers still use the button). */
.resource-card,.preset-card{position:relative;cursor:pointer}
.resource-card .resource-open::after,.preset-card [data-action="use-preset"]::after{content:"";position:absolute;inset:0;z-index:1;border-radius:inherit}
.resource-card .resource-open,.preset-card [data-action="use-preset"]{position:static}
.resource-card:hover,.preset-card:hover{border-color:var(--pen,#2140c4)}
.resource-card:hover h3{color:var(--pen,#2140c4)}
.resource-card:focus-within,.preset-card:focus-within{outline:2px solid var(--pen,#2140c4);outline-offset:2px}
.resource-card .resource-open:focus-visible{outline:none}