/* MEP classroom presentation only. Shared English/ESL, public pages and editors are not targeted. */
body.mep-nav-page,.mep-classroom-entry{
 --mep-radius:18px;--mep-gap:12px;--mep-ink:var(--site-text,#f8fafc);
 --mep-muted:var(--site-muted,#b7c5d8);--mep-panel:var(--site-surface-solid,#111827);
 --mep-soft:var(--site-surface-soft,#162640);--mep-line:var(--site-border,#2b3b55);
 --mep-accent:var(--site-primary,#38bdf8);--mep-tint:var(--site-primary-soft,rgba(56,189,248,.16));
}
body.mep-nav-page{font-size:16px;line-height:1.6}
body.mep-nav-page :is(.topbar,.course-topbar,.study-topbar,.science-topbar){
 position:relative!important;display:flex;align-items:center;flex-wrap:wrap;gap:12px;
 min-height:68px;padding:12px max(20px,calc((100vw - 1200px)/2));
 background:var(--mep-panel);border-bottom:1px solid var(--mep-line);box-shadow:none;z-index:50;
}
body.mep-nav-page :is(.brand,.course-brand,.study-brand,.science-brand){font-size:1.1rem;letter-spacing:-.02em;line-height:1.3;text-decoration:none!important;white-space:nowrap;width:auto;flex:0 0 auto}
body.mep-nav-page header :is(.viewer,.viewer-badge){margin-left:auto;font-size:.75rem;color:var(--mep-muted);border:0;background:transparent;white-space:normal;max-width:220px;line-height:1.4}
/* The original links remain available in a compact native disclosure; no duplicate long header row. */
body.mep-nav-page .mep-quick-menu{position:relative;margin-left:auto;z-index:90}
body.mep-nav-page .mep-quick-menu>summary{display:flex;align-items:center;gap:9px;min-height:44px;box-sizing:border-box;padding:8px 14px;border:1px solid var(--mep-line);border-radius:12px;color:var(--mep-ink);background:var(--mep-soft);font-size:.82rem;font-weight:650;cursor:pointer;list-style:none;white-space:nowrap}
body.mep-nav-page .mep-quick-menu>summary::-webkit-details-marker{display:none}
body.mep-nav-page .mep-quick-menu>summary::after{content:'⌄';font-size:1.1rem;line-height:1}
body.mep-nav-page .mep-quick-menu[open]>summary::after{content:'⌃'}
body.mep-nav-page header .mep-quick-menu>nav{position:absolute!important;right:0;top:calc(100% + 8px);display:grid!important;grid-template-columns:1fr;gap:6px;width:min(320px,calc(100vw - 32px));max-height:65vh;overflow:auto;box-sizing:border-box;padding:10px;margin:0;border:1px solid var(--mep-line);border-radius:16px;background:var(--mep-panel);box-shadow:var(--site-shadow-soft,0 10px 24px #0002)}
body.mep-nav-page header .mep-quick-menu :is(nav>a,nav>details>summary){display:flex;align-items:center;gap:9px;min-height:44px;box-sizing:border-box;padding:9px 12px;font-size:.86rem;line-height:1.45;text-decoration:none!important;color:var(--mep-ink);border:1px solid transparent;border-radius:10px;white-space:normal;overflow-wrap:break-word}
body.mep-nav-page header .mep-quick-menu nav>a:hover{background:var(--mep-soft);border-color:var(--mep-line)}
body.mep-nav-page header .mep-quick-menu .course-tools-popover{position:static;min-width:0;background:var(--mep-soft);box-shadow:none}
/* A light breadcrumb row, then clear semester cards, then practical actions. */
body.mep-nav-page .mep-nav-shell{padding:18px 22px 20px;margin:20px auto 12px;width:calc(100% - 40px);max-width:1200px;border:1px solid var(--mep-line);border-radius:22px;background:var(--mep-panel);box-shadow:0 4px 18px rgba(0,0,0,.06);z-index:20}
body.mep-nav-page .mep-nav-context{margin:0 0 14px;padding:0 0 10px;border-bottom:1px solid var(--mep-line)}
body.mep-nav-page .mep-nav-context nav{gap:4px;align-items:center}
body.mep-nav-page .mep-nav-context a{display:inline-flex;align-items:center;min-height:44px;padding:6px 10px;border:0;border-radius:9px;font-size:.76rem;font-weight:600;color:var(--mep-muted);background:transparent;text-decoration:none!important;white-space:nowrap;overflow-wrap:normal}
body.mep-nav-page .mep-nav-context a:hover{background:var(--mep-soft);color:var(--mep-ink)}
body.mep-nav-page .mep-nav-context a+a::before{content:'›';margin-right:12px;opacity:.65}
body.mep-nav-page .mep-nav-label,.mep-classroom-entry .mep-nav-label{font-size:.79rem;font-weight:700;letter-spacing:.025em;margin:0 0 10px;color:var(--mep-muted)}
body.mep-nav-page .mep-nav-label>span,.mep-classroom-entry .mep-nav-label>span{font-size:.78rem;letter-spacing:0;font-weight:400}
:is(body.mep-nav-page,.mep-classroom-entry) .mep-semester-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
:is(body.mep-nav-page,.mep-classroom-entry) .mep-semester-choice{display:flex;align-items:stretch;justify-content:flex-start;gap:4px;min-height:0;padding:16px 18px;border:1px solid var(--mep-line);border-radius:16px;background:var(--mep-soft);color:var(--mep-ink);text-decoration:none!important;line-height:1.4;overflow-wrap:break-word;box-shadow:none;transition:border-color .15s,background .15s,box-shadow .15s}
:is(body.mep-nav-page,.mep-classroom-entry) .mep-semester-choice.is-selected{border:2px solid var(--mep-accent);padding:15px 17px;background:linear-gradient(125deg,var(--mep-tint),transparent),var(--mep-panel);box-shadow:0 2px 12px rgba(0,0,0,.04)}
:is(body.mep-nav-page,.mep-classroom-entry) .mep-choice-top{display:flex;align-items:center;gap:10px;color:var(--mep-ink)}
:is(body.mep-nav-page,.mep-classroom-entry) .mep-choice-top>strong{min-width:0;flex:1;font-size:1rem;font-weight:750;line-height:1.35;letter-spacing:-.015em}
:is(body.mep-nav-page,.mep-classroom-entry) .mep-choice-icon{display:grid;place-items:center;width:32px;height:32px;flex:0 0 32px;border:1px solid var(--mep-line);border-radius:10px;color:var(--mep-ink);background:var(--mep-panel);font-size:.72rem;font-weight:800;letter-spacing:.03em}
:is(body.mep-nav-page,.mep-classroom-entry) .mep-semester-choice.is-selected .mep-choice-icon{border-color:var(--mep-accent);background:var(--mep-tint)}
:is(body.mep-nav-page,.mep-classroom-entry) .mep-choice-thai{font-size:.76rem;font-weight:400;color:var(--mep-muted)}
:is(body.mep-nav-page,.mep-classroom-entry) .mep-semester-choice>.mep-choice-course{font-size:.82rem;line-height:1.5;color:var(--mep-ink)}
:is(body.mep-nav-page,.mep-classroom-entry) .mep-semester-choice>em{font-size:.7rem;font-weight:650;letter-spacing:.01em;font-style:normal;color:var(--mep-muted);margin-top:6px}
:is(body.mep-nav-page,.mep-classroom-entry) .mep-semester-choice.is-selected>em{color:var(--mep-ink)}
:is(body.mep-nav-page,.mep-classroom-entry) .mep-semester-choice:hover{border-color:var(--mep-accent);background-color:var(--mep-panel)}
body.mep-nav-page .mep-course-links{gap:9px;margin-top:14px}
body.mep-nav-page :is(.mep-nav-action,.mep-topic-picker>summary){padding:10px 14px;min-height:46px;border:1px solid var(--mep-line);border-radius:12px;background:var(--mep-soft);color:var(--mep-ink);font-weight:650;font-size:.82rem;line-height:1.4;text-decoration:none!important;box-shadow:none}
body.mep-nav-page .mep-primary-action{background:var(--mep-tint);border-color:var(--mep-accent)}
body.mep-nav-page .mep-current-topic{margin:12px 0 0;padding-top:12px;border-top:1px solid var(--mep-line);font-size:.83rem;font-weight:600;line-height:1.5}
body.mep-nav-page .mep-area-options{gap:10px;margin:10px 0 0}
body.mep-nav-page .mep-area-choice{border:1px solid var(--mep-line);border-radius:14px;min-height:74px;padding:12px 14px;background:var(--mep-soft);text-decoration:none!important;box-shadow:none}
body.mep-nav-page .mep-area-choice strong{font-size:.86rem;line-height:1.4}
body.mep-nav-page .mep-area-choice small{font-size:.76rem;color:var(--mep-muted)}
body.mep-nav-page .mep-area-choice.is-selected{border-color:var(--mep-accent);background:var(--mep-tint)}
body.mep-nav-page .mep-semester-selector+.mep-nav-label{margin-top:16px}
body.mep-nav-page .mep-topic-panel{padding:8px;border:1px solid var(--mep-line);border-radius:16px;max-height:60vh;background:var(--mep-panel)}
body.mep-nav-page .mep-topic-panel nav{gap:4px}
body.mep-nav-page .mep-topic-panel a{display:grid;grid-template-columns:64px 1fr;align-items:center;gap:10px;min-height:48px;border:1px solid transparent;border-radius:10px;padding:10px;text-decoration:none!important;background:transparent}
body.mep-nav-page .mep-topic-number{font-size:.7rem;font-weight:750;color:var(--mep-muted);white-space:nowrap}
body.mep-nav-page .mep-topic-name{font-size:.82rem;line-height:1.4}
body.mep-nav-page .mep-topic-panel a:hover,body.mep-nav-page .mep-topic-panel a[aria-current=page]{border-color:var(--mep-accent);background:var(--mep-tint)}
/* Existing tool links become separate, legible touch targets, including the screenshots' run-on links. */
body.mep-nav-page .mep-quick-tools{padding:0;margin:20px 0 0!important;border:0!important;border-radius:0;background:transparent!important;box-shadow:none}
body.mep-nav-page .mep-quick-tools>h2{margin:0 0 10px;font-size:.76rem;font-weight:750;line-height:1.4;letter-spacing:.04em;color:var(--mep-muted)}
body.mep-nav-page .learning-tools-grid{display:flex;flex-wrap:wrap;align-items:stretch;gap:10px;padding:0 14px 14px}
body.mep-nav-page .mep-quick-tools>.learning-tools-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(190px,100%),1fr));gap:10px;padding:0}
body.mep-nav-page .learning-tools-grid>a{display:flex;align-items:center;gap:10px;min-width:0;min-height:48px;box-sizing:border-box;padding:12px 14px;border:1px solid var(--mep-line);border-radius:12px;background:var(--mep-soft);color:var(--mep-ink);font-size:.83rem;font-weight:600;line-height:1.5;text-decoration:none!important;overflow-wrap:break-word}
body.mep-nav-page .learning-tools-grid>a:hover{border-color:var(--mep-accent);background:var(--mep-tint)}
body.mep-nav-page .mep-link-icon{display:inline-flex;align-items:center;justify-content:center;flex:0 0 20px;width:20px;height:20px;opacity:.9;color:var(--mep-ink)}
body.mep-nav-page .mep-link-icon svg{width:19px;height:19px;display:block}
/* Keep curriculum text and editor/canvas internals out of the presentation selectors. */
body.mep-nav-page :is(.hero,.course-hero,.bb-hero,.cms-hero){border:1px solid var(--mep-line);border-radius:22px;box-shadow:none;padding:24px;background:linear-gradient(120deg,var(--mep-tint),transparent 70%),var(--mep-panel)}
body.mep-nav-page :is(.hero,.course-hero,.bb-hero,.cms-hero) h1{font-size:clamp(1.7rem,3vw,2.55rem);line-height:1.25;letter-spacing:-.025em}
body.mep-nav-page :is(.hero-actions,.bb-actions,.cms-actions,.week-nav,.lesson-nav){display:flex;flex-wrap:wrap;align-items:stretch;gap:10px}
body.mep-nav-page :is(.hero,.course-hero)>.button{margin:6px 8px 0 0}
body.mep-nav-page :is(.button,.hero-actions>a,.bb-actions>a,.cms-actions>a,.section-heading>a,.week-nav>a,.lesson-nav>a,.lesson-top-links>a,.hs-course-actions>a,.lab-list article>a){min-height:46px;box-sizing:border-box;display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 16px;border-radius:12px;font-size:.87rem;line-height:1.4;text-decoration:none!important;font-weight:700}
body.mep-nav-page :is(.button.secondary,.week-nav>a,.lesson-nav>a,.section-heading>a:not(.button),.lab-list article>a){background:var(--mep-soft);border:1px solid var(--mep-line);color:var(--mep-ink);box-shadow:none}
body.mep-nav-page :is(.learning-step-strip,.lesson-steps){gap:8px;padding:5px;border:1px solid var(--mep-line);border-radius:16px;background:var(--mep-panel)}
body.mep-nav-page .learning-step-strip>a{min-height:44px;box-sizing:border-box;display:flex;justify-content:center;align-items:center;padding:10px 8px;border:1px solid transparent;border-radius:11px;color:var(--mep-muted);font-size:.84rem;font-weight:650;line-height:1.3;text-decoration:none!important}
body.mep-nav-page .learning-step-strip>a:hover,body.mep-nav-page .learning-step-strip>a.is-current{background:var(--mep-tint);border-color:var(--mep-accent);color:var(--mep-ink)}
body.mep-nav-page :is(.week-card,.lesson-card){text-decoration:none!important;border:1px solid var(--mep-line);border-radius:18px;box-shadow:none;transition:border-color .15s,box-shadow .15s}
body.mep-nav-page :is(.week-card,.lesson-card):hover{border-color:var(--mep-accent);box-shadow:0 6px 18px rgba(0,0,0,.09);transform:none}
body.mep-nav-page :is(.week-grid,.lesson-grid){gap:16px}
body.mep-nav-page .cr-mep-study-switcher{width:calc(100% - 40px);max-width:1200px;margin:10px auto 18px;box-sizing:border-box;padding:8px 14px;border:1px solid var(--mep-line);border-radius:14px;background:var(--mep-panel);box-shadow:none}
body.mep-nav-page .cr-mep-study-title{font-size:.78rem;font-weight:650;color:var(--mep-muted);line-height:1.4}
body.mep-nav-page .cr-mep-study-option{min-height:44px;border-radius:10px}
body.mep-nav-page .mep-week-outline a{font-size:.79rem;line-height:1.5;border:1px solid transparent;border-radius:10px;text-decoration:none!important}
body.mep-nav-page .mep-week-outline a:hover{background:var(--mep-soft);border-color:var(--mep-line)}
body.mep-nav-page .mep-week-outline a[aria-current=page]{border-color:var(--mep-accent);background:var(--mep-tint)}
body.mep-nav-page .mep2-navigation-home main{margin-top:0}
body.mep-nav-page #mep2-lab-list>div>a{border-radius:12px;text-decoration:none!important}
body.mep-nav-page :is(.mep-nav-shell,.mep-quick-tools,.mep-quick-menu,.learning-step-strip,.hero-actions,.week-nav,.lesson-nav) :is(a,summary,button):focus-visible,.mep-classroom-entry a:focus-visible{outline:3px solid var(--mep-accent);outline-offset:3px}
body.mep-nav-page :is(#lessons,#scratch-tools,#vocabulary-tools,#resources,#classroom-resources){scroll-margin-top:18px}
/* MEP3 Science keeps its own course structure and semester links. */
body.mep-science-layout .science-nav>a{white-space:nowrap}
body.mep-science-layout .semester-grid{gap:16px}
body.mep-science-layout .semester-grid>a{padding:22px;border-radius:18px;border:1px solid var(--mep-line);color:var(--mep-ink);background:var(--mep-panel);text-decoration:none!important}
body.mep-science-layout .semester-grid>a:hover{border-color:var(--mep-accent)}
@media(max-width:780px){
 body.mep-nav-page :is(.topbar,.course-topbar,.study-topbar,.science-topbar){padding:10px 16px;gap:8px;min-height:60px}
 body.mep-nav-page header :is(.viewer,.viewer-badge){font-size:.7rem;max-width:120px}
 body.mep-nav-page .mep-nav-shell{width:calc(100% - 24px);margin:12px auto 10px;padding:12px;border-radius:18px}
 body.mep-nav-page .mep-nav-context{padding-bottom:8px;margin-bottom:12px}
 body.mep-nav-page .mep-nav-context nav{gap:0;justify-content:flex-start}
 body.mep-nav-page .mep-nav-context a{font-size:.69rem;min-height:44px;padding:5px 6px}
 body.mep-nav-page .mep-nav-context a+a::before{margin-right:8px}
 :is(body.mep-nav-page,.mep-classroom-entry) .mep-semester-options{gap:8px}
 :is(body.mep-nav-page,.mep-classroom-entry) .mep-semester-choice{padding:12px;gap:5px;border-radius:14px}
 :is(body.mep-nav-page,.mep-classroom-entry) .mep-semester-choice.is-selected{padding:11px}
 :is(body.mep-nav-page,.mep-classroom-entry) .mep-choice-top{gap:7px;flex-wrap:nowrap}
 :is(body.mep-nav-page,.mep-classroom-entry) .mep-choice-top>strong{font-size:.91rem}
 :is(body.mep-nav-page,.mep-classroom-entry) .mep-choice-icon{width:26px;height:26px;flex-basis:26px;border-radius:8px;font-size:.65rem}
 :is(body.mep-nav-page,.mep-classroom-entry) .mep-choice-thai{font-size:.7rem}
 :is(body.mep-nav-page,.mep-classroom-entry) .mep-semester-choice>.mep-choice-course{font-size:.76rem;line-height:1.5}
 body.mep-nav-page .mep-course-links{gap:8px;margin-top:12px}
 body.mep-nav-page :is(.mep-nav-action,.mep-topic-picker>summary){font-size:.78rem;padding:10px 12px}
 body.mep-nav-page .mep-course-links>.mep-nav-action{flex:1 1 130px}
 body.mep-nav-page .mep-topic-picker{position:static}
 body.mep-nav-page .mep-topic-panel{left:8px;right:8px;top:auto;width:auto}
 body.mep-nav-page .mep-area-options{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
 body.mep-nav-page .mep-area-choice:first-child{grid-column:1/-1}
 body.mep-nav-page .mep-area-choice{min-height:60px;padding:10px 12px;gap:2px}
 body.mep-nav-page .mep-area-choice strong{font-size:.83rem}
 body.mep-nav-page .mep-nav-shell[data-mep-context=lesson] .mep-area-options{grid-template-columns:repeat(2,minmax(0,1fr))}
 body.mep-nav-page .mep-nav-shell[data-mep-context=lesson] .mep-area-choice{min-height:56px;padding:10px 12px}
 body.mep-nav-page :is(.hero,.course-hero,.bb-hero,.cms-hero){padding:18px;border-radius:18px}
 body.mep-nav-page .mep-quick-tools>.learning-tools-grid{grid-template-columns:1fr;gap:8px}
 body.mep-nav-page .learning-tools-grid>a{min-height:48px;padding:12px;font-size:.82rem}
 body.mep-nav-page .cr-mep-study-switcher{width:calc(100% - 24px);padding:8px 10px;margin:8px auto 14px}
 body.mep-nav-page :is(.week-grid,.lesson-grid){gap:12px}
 body.mep-nav-page .learning-step-strip{grid-template-columns:repeat(5,minmax(0,1fr));gap:3px;padding:4px}
 body.mep-nav-page .learning-step-strip>a{font-size:.71rem;padding:9px 2px;grid-column:auto}
 body.mep-nav-page .learning-step-strip.mep-three-step,body.mep-nav-page .learning-step-strip.python-lab-three{grid-template-columns:repeat(3,minmax(0,1fr))}
 body.mep-nav-page :is(.hero-actions,.bb-actions,.cms-actions,.week-nav,.lesson-nav)>a{flex:1 1 140px}
 body.mep-nav-page .mep-quick-menu{position:static}
 body.mep-nav-page header .mep-quick-menu>nav{left:12px;right:12px;top:calc(100% + 4px);width:auto}
}
@media(prefers-reduced-motion:reduce){body.mep-nav-page :is(.mep-semester-choice,.week-card,.lesson-card){transition:none}}
@media print{body.mep-nav-page :is(.mep-nav-shell,.mep-quick-menu,.cr-verified-access-bar,.cr-mep-study-switcher){display:none!important}}

/* Resolve inherited width and stacking rules on legacy course headers. */
body.mep-nav-page header :is(.brand,.course-brand,.study-brand,.science-brand){width:auto!important;flex:0 0 auto}
body.mep-nav-page section.mep-quick-tools.learning-tools>.learning-tools-grid{padding:0}
:is(body.mep-nav-page,.mep-classroom-entry) .mep-semester-choice>em>span[aria-hidden]{display:inline}
@media(max-width:780px){
 body.mep-nav-page header :is(.viewer,.viewer-badge){flex:1 0 100%;max-width:none;margin:0;text-align:right;font-size:.65rem;line-height:1.2}
 body.mep-nav-page .mep-quick-menu>summary{padding:8px 12px;min-height:44px}
 body.mep-nav-page.mep2-navigation-home>header p{margin:4px 0;font-size:.75rem;line-height:1.5}
 body.mep-nav-page.mep2-navigation-home>header{padding:12px 16px!important}
 body.mep-nav-page.mep2-navigation-home>header h1{margin:0;font-size:1.3rem!important}
}
@media(max-width:360px){:is(body.mep-nav-page,.mep-classroom-entry) .mep-choice-icon{display:none}}

/* Science has short primary semester tabs already; keep those visible instead of folding them away. */
body.mep-science-layout header .science-nav{display:flex;align-items:center;flex-wrap:wrap;gap:8px;overflow:visible}
body.mep-science-layout header .science-nav>a{display:flex;align-items:center;justify-content:center;min-height:44px;box-sizing:border-box;padding:8px 12px;border:1px solid var(--mep-line);border-radius:11px;background:var(--mep-soft);color:var(--mep-ink);font-size:.8rem;line-height:1.4;text-decoration:none!important;white-space:nowrap}
body.mep-science-layout header .science-nav>a.active{border-color:var(--mep-accent);background:var(--mep-tint)}
body.mep-science-layout header .science-nav .course-tools-popover a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:10px;line-height:1.4;text-decoration:none!important;color:var(--mep-ink)}
@media(max-width:780px){body.mep-science-layout header .science-nav{width:100%;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}body.mep-science-layout header .science-nav .course-tools-menu{grid-column:1/-1}body.mep-science-layout header .science-nav .course-tools-popover{position:absolute;top:100%;left:0;right:0;background:var(--mep-panel);min-width:0}}

body.mep-nav-page .mep-area-choice strong{display:flex;align-items:center;justify-content:space-between;gap:8px}
body.mep-nav-page .mep-area-choice strong>span:first-child{min-width:0}
body.mep-nav-page .mep-area-choice strong>span[aria-hidden]{flex:0 0 auto}
body.mep-nav-page .mep-quick-menu .course-tools-popover>a{display:flex;align-items:center;min-height:44px;padding:9px 12px;border-radius:10px;font-size:.83rem;color:var(--mep-ink);text-decoration:none!important}