/*
  PrepMode shared design system
  -----------------------------
  Root-level stylesheet used across the website.
  Keep reusable brand, theme, layout, accessibility and learning-component
  styles here. Page-specific overrides belong in home.css / english.css.
*/

:root{
  --bg:#f6f2e9;--surface:#fffdf8;--soft:#f0ece3;--text:#1f2b28;--muted:#71827b;
  --teal:#0f6b5c;--teal2:#1f9c85;--tealsoft:#deeee8;--amber:#e8a23d;--ambersoft:#f8ead1;
  --border:#ddd8ce;--border2:#c9c4b8;--header:rgba(246,242,233,.91);--shadow:0 18px 50px rgba(31,43,40,.06);
  --max:1120px
}
html[data-theme="dark"]{
  --bg:#101714;--surface:#151e1a;--soft:#1b2621;--text:#edf4f0;--muted:#9aaba4;
  --teal:#65cbb3;--teal2:#43b99d;--tealsoft:#173c32;--amber:#efb45d;--ambersoft:#3b2d19;
  --border:#293831;--border2:#3a4b43;--header:rgba(16,23,20,.92);--shadow:0 22px 56px rgba(0,0,0,.23)
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--bg)}
body{margin:0;min-width:320px;background:var(--bg);color:var(--text);font-family:"Inter",system-ui,sans-serif;line-height:1.66;-webkit-font-smoothing:antialiased}
button,a,input{font:inherit} button{color:inherit} a{color:inherit} img,svg{display:block;max-width:100%}
::selection{background:var(--teal);color:#fff}
:focus-visible{outline:3px solid var(--amber);outline-offset:3px}
[hidden]{display:none!important}
.skip{position:fixed;z-index:1000;top:8px;left:8px;padding:9px 13px;background:var(--text);color:var(--bg);border-radius:9px;transform:translateY(-150%)}
.skip:focus{transform:none}
.wrap{width:min(var(--max),calc(100% - 40px));margin-inline:auto}
.eyebrow,.micro{margin:0 0 13px;color:var(--teal);font:600 .72rem/1.2 "JetBrains Mono",monospace;text-transform:uppercase;letter-spacing:.09em}
.micro{font-size:.66rem;margin-bottom:7px}.amber{color:var(--amber)}

.site-header{position:sticky;top:0;z-index:100;background:var(--header);border-bottom:1px solid color-mix(in srgb,var(--border) 84%,transparent);backdrop-filter:blur(18px)}
.header-row{min-height:66px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand{display:inline-flex;align-items:center;gap:9px;text-decoration:none;font-family:"Space Grotesk",sans-serif;font-size:1.35rem;font-weight:900;letter-spacing:-.035em;line-height:1}
.brand-logo{width:32px;height:32px;display:block;object-fit:contain;flex:0 0 auto;border-radius:7px}
.brand-text{color:var(--teal)}
.brand-text span{color:var(--teal)}
.logo.small{width:33px;height:33px;display:grid;place-items:center;border:1px solid rgba(31,43,40,.08);border-radius:9px;overflow:hidden;background:#f6f2e9}.logo.small img{width:100%;height:100%;object-fit:cover}
@media(max-width:700px){.brand{gap:8px}.brand-logo{width:29px;height:29px;border-radius:6px}}
.header-tools{display:flex;align-items:center;gap:10px}.board{font:600 .68rem "JetBrains Mono",monospace;color:var(--muted);white-space:nowrap}
.theme-toggle.theme-pill{
  position:relative;width:72px;height:36px;min-width:72px;padding:3px;border:1px solid var(--border);
  border-radius:999px;background:rgba(255,253,248,.78);display:flex;align-items:center;justify-content:space-between;
  cursor:pointer;color:var(--muted);transition:.18s ease
}
.theme-toggle.theme-pill::before{
  content:"";position:absolute;width:28px;height:28px;left:3px;top:3px;border-radius:50%;
  background:var(--surface);box-shadow:0 3px 10px rgba(31,43,40,.10);transition:transform .22s ease,background .18s ease
}
.theme-toggle .pill-icon{position:relative;z-index:1;width:28px;height:28px;display:grid;place-items:center}
.theme-toggle .pill-icon svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.theme-toggle .sun-side{color:var(--amber)}
.theme-toggle .moon-side{color:#63706b}
html[data-theme="dark"] .theme-toggle.theme-pill{background:rgba(29,41,37,.82);border-color:var(--border)}
html[data-theme="dark"] .theme-toggle.theme-pill::before{transform:translateX(36px);background:#26342f;box-shadow:0 3px 12px rgba(0,0,0,.22)}
html[data-theme="dark"] .theme-toggle .sun-side{color:#87918d}
html[data-theme="dark"] .theme-toggle .moon-side{color:#f2c66f}
@media(max-width:700px){
  .theme-toggle.theme-pill{width:66px;height:34px;min-width:66px}
  .theme-toggle.theme-pill::before{width:26px;height:26px}
  html[data-theme="dark"] .theme-toggle.theme-pill::before{transform:translateX(32px)}
  .theme-toggle .pill-icon{width:26px;height:26px}
}

.subject-hero{padding:38px 0 4px}
.subject-hero-inner{width:min(var(--max),calc(100% - 40px))}
.subject-hero h1{margin:0;max-width:1030px;font:700 clamp(2.05rem,6vw,4.55rem)/.98 "Space Grotesk",sans-serif;letter-spacing:-.065em}
.subject-hero h1 span{color:var(--teal)}
.subject-hero-copy{margin:17px 0 0;color:var(--text);font-size:clamp(.86rem,2vw,1.08rem);letter-spacing:-.018em}
.hero-credit-band{padding:0 0 12px}
.hero-credit-band .initiative-credit{font-size:clamp(.88rem,1.75vw,1.14rem);padding-top:2px}
@media(max-width:700px){
 .subject-hero{padding:30px 0 4px}
 .subject-hero-inner{width:min(var(--max),calc(100% - 28px))}
 .subject-hero h1{font-size:clamp(1.9rem,10vw,3.2rem)}
 .subject-hero-copy{font-size:clamp(.78rem,3.5vw,.98rem)}
 .hero-credit-band{padding:0 0 8px}
 .hero-credit-band .initiative-credit{font-size:clamp(.56rem,2.65vw,.90rem);white-space:nowrap}
}

.primary,.secondary{min-height:48px;display:inline-flex;align-items:center;justify-content:center;padding:0 18px;border-radius:12px;font-weight:700;text-decoration:none;cursor:pointer;transition:.16s ease}
.primary{border:1px solid var(--teal);background:var(--teal);color:#fff}.primary:hover,.secondary:hover{transform:translateY(-2px)}
html[data-theme="dark"] .primary{color:#0e1714}.primary.small{min-height:42px}
.secondary{border:1px solid var(--border2);background:transparent}.secondary:hover{border-color:var(--teal);color:var(--teal)}

.progress-section{padding:0 0 44px}.progress-shell{padding-top:29px;padding-bottom:27px;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.progress-head{display:flex;align-items:end;justify-content:space-between;gap:25px}.progress-head h2,.section-heading h2,.next-card h2,.quick-revision h2{margin:0;font:600 clamp(1.8rem,4.7vw,3.05rem)/1.06 "Space Grotesk",sans-serif;letter-spacing:-.05em}
.progress-head h2{font-size:clamp(1.55rem,4vw,2.15rem)}.progress-head>p{margin:0;color:var(--muted);font-size:.84rem;text-align:right}
.progress-track{height:7px;margin-top:24px;background:var(--soft);border-radius:999px;overflow:hidden}.progress-track span{display:block;width:0;height:100%;background:var(--teal);border-radius:inherit;transition:width .3s ease}
.source-note{margin:11px 0 0;color:var(--muted);font-size:.77rem}

.areas,.method,.milestones{padding:76px 0}.areas{padding-top:8px}.section-heading{max-width:720px;margin-bottom:33px}.section-heading.compact{max-width:650px;margin-bottom:27px}.section-heading>p:last-child{margin:11px 0 0;color:var(--muted)}
.area-tabs{display:grid;grid-template-columns:repeat(6,1fr);border-top:1px solid var(--border);border-bottom:1px solid var(--border);overflow:auto}
.area-tab{min-height:64px;border:0;background:transparent;color:var(--muted);font-weight:700;cursor:pointer}.area-tab+.area-tab{border-left:1px solid var(--border)}.area-tab span{margin-right:7px;color:var(--teal);font:600 .63rem "JetBrains Mono",monospace}
.area-tab:hover,.area-tab.active{color:var(--teal);background:var(--tealsoft)}

.area-panel{margin-top:22px;border:1px solid var(--border);border-radius:20px;background:var(--surface);overflow:hidden;box-shadow:0 12px 36px rgba(31,43,40,.03)}
.area-intro{padding:26px 28px;border-bottom:1px solid var(--border)}.area-intro h3{margin:0;font:600 1.6rem "Space Grotesk",sans-serif;letter-spacing:-.04em}.area-intro p{max-width:760px;margin:7px 0 0;color:var(--muted)}
.topic-list{padding:0 28px}.topic{border-bottom:1px solid var(--border)}.topic:last-child{border-bottom:0}
.topic summary{list-style:none;display:flex;align-items:center;justify-content:space-between;gap:18px;padding:20px 0;cursor:pointer}.topic summary::-webkit-details-marker{display:none}
.topic-left{display:flex;align-items:center;gap:14px;min-width:0}.topic-index{width:31px;flex:0 0 31px;color:var(--teal);font:600 .67rem "JetBrains Mono",monospace}
.topic-title{display:block;font:600 1.06rem "Space Grotesk",sans-serif;letter-spacing:-.025em}.topic-meta{display:block;margin-top:2px;color:var(--muted);font-size:.77rem}
.plus{width:30px;height:30px;display:grid;place-items:center;flex:0 0 30px;border:1px solid var(--border);border-radius:50%;color:var(--muted);transition:.16s ease}.topic[open] .plus{transform:rotate(45deg);color:var(--teal);border-color:var(--teal)}
.topic-body{padding:0 0 27px}.study-tabs{display:flex;gap:7px;overflow:auto;padding:4px 0 13px}
.study-tab{flex:0 0 auto;min-height:38px;padding:0 12px;border:1px solid var(--border);border-radius:999px;background:transparent;color:var(--muted);font-size:.79rem;font-weight:650;cursor:pointer}.study-tab.active{border-color:var(--teal);background:var(--tealsoft);color:var(--teal)}
.study-view{padding-top:3px}.content-card,.quiz-card,.recall-card,.answer-item,.sample-card,.instruction-card{border:1px solid var(--border);border-radius:13px;background:var(--soft)}
.content-card,.sample-card,.instruction-card{padding:18px}.content-card p,.sample-card p{margin:0}.content-card p+p,.sample-card p+p{margin-top:12px}
.quiz-list,.recall-list,.answer-list{display:grid;gap:11px}.quiz-card,.recall-card{padding:16px}.quiz-card>p,.recall-card>p{margin:0 0 10px;font-weight:700}
.option{display:flex;align-items:flex-start;gap:9px;margin-top:7px;color:var(--muted);cursor:pointer}.option input{margin-top:5px;accent-color:var(--teal)}
.practice-row{display:flex;align-items:center;gap:11px;flex-wrap:wrap;margin-top:12px}.check-btn{min-height:37px;padding:0 12px;border:0;border-radius:9px;background:var(--teal);color:#fff;font-weight:700;cursor:pointer}html[data-theme="dark"] .check-btn{color:#0e1714}
.feedback{margin:0;color:var(--muted);font-size:.83rem}.feedback.ok{color:var(--teal);font-weight:700}.feedback.no{color:var(--amber);font-weight:700}
.answer-item{overflow:hidden}.answer-item button{width:100%;display:flex;justify-content:space-between;gap:16px;padding:14px 15px;border:0;background:transparent;text-align:left;font-weight:700;cursor:pointer}.answer-text{padding:0 15px 15px;color:var(--muted)}
.answer-text p{margin:0}.finish-row{margin-top:18px;padding-top:17px;border-top:1px dashed var(--border2)}.complete{min-height:40px;padding:0 13px;border:1px solid var(--border2);border-radius:10px;background:transparent;font-weight:700;cursor:pointer}.complete:hover{border-color:var(--teal);color:var(--teal)}.complete.done{background:var(--tealsoft);border-color:var(--teal);color:var(--teal)}

.instruction-card ol,.instruction-card ul,.content-card ul{margin:0;padding-left:21px}.instruction-card li+li,.content-card li+li{margin-top:7px}
.sample-title{margin:0 0 12px;font:600 1rem "Space Grotesk",sans-serif}.checklist{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin:0;padding:0;list-style:none}.checklist li{padding:10px 12px;border:1px solid var(--border);border-radius:10px;background:var(--soft)}.checklist li::before{content:"✓";margin-right:8px;color:var(--teal);font-weight:700}
.practice-section{display:grid;gap:18px}.practice-section h4{margin:0 0 10px;font:600 1rem "Space Grotesk",sans-serif}.subtle-divider{height:1px;background:var(--border)}


.sample-stack{display:grid;gap:16px}
.sample-card{padding:0;overflow:hidden}
.sample-top{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;padding:17px 18px 14px;border-bottom:1px solid var(--border)}
.sample-title{margin:0;font:600 1.02rem "Space Grotesk",sans-serif;letter-spacing:-.025em}
.sample-meta{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:7px}
.sample-meta span{display:inline-flex;align-items:center;min-height:28px;padding:4px 9px;border:1px solid var(--border);border-radius:999px;background:var(--surface);color:var(--muted);font-size:.71rem;font-weight:650}
.sample-meta .sample-limit{border-color:color-mix(in srgb,var(--teal) 55%,var(--border));color:var(--teal)}
.sample-note{margin:0;padding:10px 18px;background:var(--ambersoft);color:var(--muted);font-size:.76rem;border-bottom:1px solid var(--border)}
.sample-format{padding:15px 18px;background:color-mix(in srgb,var(--soft) 72%,var(--surface))}
.sample-format p,.sample-body p{white-space:pre-line}
.sample-format p{margin:0;font-size:.88rem}
.sample-format p+p{margin-top:8px}
.sample-header{border-bottom:1px solid var(--border)}
.sample-footer{border-top:1px solid var(--border)}
.sample-body{padding:18px}
.sample-body p{margin:0}
.sample-body p+p{margin-top:12px}

.method-grid{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}.method-grid article{padding:25px 22px}.method-grid article+article{border-left:1px solid var(--border)}.method-grid article>span{color:var(--teal);font:600 .66rem "JetBrains Mono",monospace}.method-grid h3{margin:18px 0 5px;font:600 1.4rem "Space Grotesk",sans-serif;letter-spacing:-.04em}.method-grid p{margin:0;color:var(--muted)}

.milestone-row{display:flex;gap:9px;overflow:auto;padding-bottom:7px}.milestone{flex:0 0 210px;display:flex;gap:10px;padding:14px;border:1px solid var(--border);border-radius:12px;background:var(--surface)}.milestone b{width:24px;height:24px;display:grid;place-items:center;flex:0 0 24px;color:var(--teal)}.milestone strong,.milestone small{display:block}.milestone strong{font:600 .91rem "Space Grotesk",sans-serif}.milestone small{margin-top:2px;color:var(--muted);font-size:.71rem;line-height:1.4}.milestone.earned{border-color:var(--teal);background:var(--tealsoft)}.milestone.earned b{border-radius:50%;background:var(--teal);color:#fff}html[data-theme="dark"] .milestone.earned b{color:#0e1714}

.revision-grid{display:grid;grid-template-columns:minmax(0,.72fr) minmax(0,1.28fr);gap:43px;padding:clamp(25px,5vw,43px);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}.revision-grid>div>p:last-child{color:var(--muted)}
.quick-form fieldset{margin:0;padding:16px 0;border:0;border-bottom:1px solid var(--border)}.quick-form fieldset:first-child{padding-top:0}.quick-form legend{font-weight:700;margin-bottom:8px}.quick-form label{display:flex;gap:9px;margin-top:7px;color:var(--muted);cursor:pointer}.quick-form input{accent-color:var(--teal)}
.quick-actions{display:flex;align-items:center;gap:14px;margin-top:20px}.text-btn{border:0;background:transparent;color:var(--teal);font-weight:700;cursor:pointer}.quick-result{min-height:1.4em;margin:12px 0 0;font-weight:700}.quick-result.ok{color:var(--teal)}.quick-result.no{color:var(--amber)}


.rules-list{display:grid;gap:11px}
.rule-card{
  padding:18px;border:1px solid var(--border);border-radius:13px;background:var(--soft)
}
.rule-heading{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.rule-number{
  color:var(--teal);font:600 .64rem "JetBrains Mono",monospace;letter-spacing:.04em
}
.rule-card h4{
  margin:0;font:600 1rem "Space Grotesk",sans-serif;letter-spacing:-.025em
}
.rule-card>p{margin:0;color:var(--text)}
.rule-examples{
  margin-top:13px;padding-top:12px;border-top:1px solid var(--border)
}
.rule-example-label{
  display:block;margin-bottom:6px;color:var(--teal);
  font:600 .64rem "JetBrains Mono",monospace;text-transform:uppercase;letter-spacing:.08em
}
.rule-examples ul{margin:0;padding-left:19px;color:var(--muted)}
.rule-examples li+li{margin-top:5px}

.ready-shell{padding-bottom:0}
.ready-intro{border-bottom:1px solid var(--border)}
.ready-form{padding:4px 28px 28px}
.ready-form fieldset{
  margin:0;padding:20px 0;border:0;border-bottom:1px solid var(--border)
}
.ready-form legend{font-weight:700;margin-bottom:9px}
.ready-form .option{max-width:760px}
.ready-actions{
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-top:22px
}
.ready-result{
  margin-top:16px;padding:0;min-height:1.4em
}
.ready-result strong{display:block;font-family:"Space Grotesk",sans-serif;font-size:1rem}
.ready-result span{display:block;margin-top:4px;color:var(--muted)}
.ready-result.strong{
  padding:14px 15px;border:1px solid var(--teal);border-radius:11px;background:var(--tealsoft)
}
.ready-result.needs-work{
  padding:14px 15px;border-left:3px solid var(--amber);border-radius:9px;background:var(--ambersoft)
}

.site-footer{padding:54px 0 42px}.footer-row{display:flex;align-items:flex-end;justify-content:space-between;gap:25px}.footer-brand{display:flex;align-items:center;gap:10px}.footer-brand strong,.footer-brand small{display:block}.footer-brand strong{font-family:"Space Grotesk",sans-serif}.footer-brand small{color:var(--muted);font-size:.76rem}.credit{text-align:right}
.initiative-credit{display:block;width:max-content;max-width:100%;margin:0;color:var(--muted);font-size:.77rem;line-height:1.4;text-align:center;white-space:nowrap}
.initiative-credit a{color:var(--teal);font-weight:700;text-decoration:none;transition:color .16s ease,opacity .16s ease}
.initiative-credit a:hover{color:var(--teal2);text-decoration:none}
.initiative-credit a:focus-visible{outline:2px solid var(--amber);outline-offset:3px;border-radius:4px}
.noscript{padding:20px;text-align:center;background:var(--ambersoft)}

@media(max-width:900px){.area-tabs{grid-template-columns:repeat(6,minmax(135px,1fr))}.revision-grid{grid-template-columns:1fr}.checklist{grid-template-columns:1fr}}
@media(max-width:700px){
 .sample-top{display:grid}.sample-meta{justify-content:flex-start}
 .wrap{width:min(var(--max),calc(100% - 28px))}.header-row{min-height:62px}.board{font-size:.6rem}.primary{width:100%}
 .progress-head{display:block}.progress-head>p{margin-top:8px;text-align:left}.areas,.method,.milestones{padding:63px 0}.areas{padding-top:8px}.area-tabs{display:flex}.area-tab{flex:0 0 145px}.area-intro,.topic-list{padding-left:18px;padding-right:18px}.ready-form{padding-left:18px;padding-right:18px}
 .topic-left{gap:9px}.topic-index{width:26px;flex-basis:26px}.topic-meta{font-size:.72rem}.secondary{width:100%}.method-grid{grid-template-columns:1fr}.method-grid article+article{border-left:0;border-top:1px solid var(--border)}
 .revision-grid{padding-left:3px;padding-right:3px}.footer-row{display:grid;gap:23px}.credit{text-align:left}.initiative-credit{font-size:clamp(.56rem,2.65vw,.77rem)}
}
@media(max-width:440px){.board{display:none}.brand{font-size:1.15rem}.topic summary{gap:8px}.study-tab{font-size:.75rem}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important}}

/* Mixed Practice Tests A–F */
.practice-test-tabs{display:flex;gap:9px;flex-wrap:wrap;padding:20px 28px 6px}
.practice-test-tab{width:42px;height:42px;border:1px solid var(--border2);border-radius:999px;background:transparent;color:var(--text);font:700 .86rem "Space Grotesk",sans-serif;cursor:pointer;transition:.18s ease}
.practice-test-tab:hover{border-color:var(--teal);color:var(--teal)}
.practice-test-tab.active{background:var(--teal);border-color:var(--teal);color:#fff;box-shadow:0 8px 20px rgba(14,111,96,.12)}
.practice-test-heading{padding:18px 28px 4px}
.practice-test-heading h4{margin:4px 0 5px;font-family:"Space Grotesk",sans-serif;font-size:1.25rem}
.practice-test-heading>p:last-child{margin:0;max-width:760px;color:var(--muted)}
.ready-form fieldset{transition:background .18s ease,border-color .18s ease;padding-left:12px;padding-right:12px}
.ready-form fieldset.is-correct{background:var(--tealsoft);border-bottom-color:rgba(14,111,96,.3)}
.ready-form fieldset.is-incorrect,.ready-form fieldset.is-unanswered{background:var(--ambersoft);border-bottom-color:rgba(224,153,43,.35)}
.answer-feedback{display:none;margin:10px 0 0;font-weight:700;font-size:.9rem}
.answer-feedback.show{display:block}
.answer-feedback.correct{color:var(--teal)}
.answer-feedback.incorrect,.answer-feedback.unanswered{color:var(--amber)}
@media(max-width:900px){.practice-test-tabs,.practice-test-heading{padding-left:18px;padding-right:18px}.practice-test-tabs{gap:8px}.practice-test-tab{width:40px;height:40px}}

/* Keep the study-area tabs close to the hero credit. */
.hero-credit-band{padding-bottom:12px}
.areas{padding-top:8px}
@media(max-width:700px){.hero-credit-band{padding-bottom:8px}.areas{padding-top:8px}}
/* Site-wide copy and screenshot deterrence */
html, body, body * {
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

input, textarea, select {
  -webkit-user-select: text;
  user-select: text;
}

img, svg {
  -webkit-user-drag: none;
  user-drag: none;
}

/* Cover page content when the browser loses focus or Print Screen is detected. */
html.pm-screen-protected::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 2147483647;
  background: var(--bg, #f6f2e9);
  pointer-events: all;
}

@media print {
  html, body {
    display: none !important;
  }
}