/* Site identity: same design system, one place per site */
.hero.single{grid-template-columns:1fr}
.hero.single .heroPanel{min-height:68vh}
.footRow{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap}
.footRow p{margin:0}
.sister{color:#d0d5dd;text-decoration:underline;text-underline-offset:3px;font-weight:700}
.btns .btn{margin-top:0}

.mark.starMark{background:radial-gradient(circle at 35% 30%,#e0e7ff,var(--star-violet) 40%,var(--star-electric) 75%,var(--star-indigo));box-shadow:0 0 30px rgba(129,140,248,.35)}
.statement.starStatement{background:linear-gradient(135deg,var(--star-navy),var(--star-indigo))}
.btnGhost{background:transparent;color:var(--star-electric);border:1.5px solid var(--star-electric)}
.feature .btns{margin-top:10px}
#tutoring .btns{margin-top:4px}

/* Algebra reference: neon poster style */
.reference{background:radial-gradient(1000px 500px at 15% 0%,rgba(79,70,229,.22),transparent 60%),radial-gradient(800px 500px at 100% 100%,rgba(247,120,186,.12),transparent 60%),#050a1c;color:#e5e7f2}
.refHead{max-width:780px}
.refKicker{display:inline-block;font-size:11px;font-weight:800;letter-spacing:.24em;text-transform:uppercase;color:#a5b4fc}
.reference h2{margin-top:10px}
.reference .lead{color:#c7cbe0}
.reference h3{font-size:15px;font-weight:900;letter-spacing:.12em;text-transform:uppercase;color:#e0e7ff;margin:0 0 14px}
.pa{color:#ff8a8a}.pb{color:#7ee787}.ph{color:#79c0ff}.pk{color:#f778ba}
.neon{background:rgba(11,19,43,.85);border:1px solid rgba(129,140,248,.55);border-radius:18px;padding:22px;box-shadow:0 0 0 1px rgba(129,140,248,.12),0 0 28px rgba(79,70,229,.22),inset 0 0 24px rgba(79,70,229,.08)}
.refTop{display:grid;grid-template-columns:.8fr 1.2fr;gap:20px;margin-top:30px}
.parentCard{display:flex;flex-direction:column;align-items:center;text-align:center}
.parentCard h3{align-self:stretch}
.bigMath{font-size:20px;margin:10px 0 0;color:#e0e7ff}
.formula{font-size:clamp(26px,3.4vw,40px);font-weight:800;letter-spacing:.01em;margin:4px 0 18px;color:#fff;white-space:nowrap}
.params{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:1fr 1fr;gap:12px 22px}
.params li{display:grid;grid-template-columns:28px 1fr;gap:8px;line-height:1.5;color:#c7cbe0;font-size:15px}
.params li>span:first-child{font-size:22px;font-weight:900;line-height:1.1}
.refTitle{margin:40px 0 16px!important}
.tgrid{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.tcard{background:rgba(11,19,43,.85);border:1px solid rgba(165,180,252,.28);border-radius:16px;padding:14px;display:flex;flex-direction:column;gap:4px}
.mini{width:100%;height:auto;max-width:150px;align-self:center;margin-bottom:6px}
.mini .grid{stroke:rgba(165,180,252,.14);stroke-width:.04;fill:none}
.mini .axis{stroke:rgba(226,232,240,.75);stroke-width:.06;fill:none}
.mini .parent{stroke:rgba(148,163,184,.75);stroke-width:.08;stroke-dasharray:.25 .18;fill:none}
.mini .curve{stroke-width:.14;fill:none;stroke-linecap:round;filter:drop-shadow(0 0 .12px currentColor)}
.trule{font-size:19px;font-weight:800;color:#fff}
.tname{font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:#a5b4fc}
.teffect{color:#d7dbee;font-size:14px;line-height:1.45}
.tex{color:#c7cbe0;font-size:13px;line-height:1.45;margin-top:2px}
.refnote{color:#aab0c8;font-size:14px;margin:14px 0 0}
.refPanels{display:grid;grid-template-columns:1.15fr .85fr;gap:20px;margin-top:34px}
.refStack{display:grid;gap:20px}
.memory{width:100%;border-collapse:collapse;font-size:14px}
.memory th{text-align:left;color:#a5b4fc;font-size:12px;letter-spacing:.06em;text-transform:uppercase;padding:8px 10px;border-bottom:1px solid rgba(165,180,252,.35)}
.memory td{padding:9px 10px;border-bottom:1px solid rgba(165,180,252,.14);color:#e0e4f5;line-height:1.4;vertical-align:top}
.memory td:nth-child(2){color:#fff;font-weight:700;white-space:nowrap}
.quick{list-style:none;padding:0;margin:0}
.quick li{display:grid;grid-template-columns:110px 1fr;gap:12px;padding:7px 0;border-bottom:1px solid rgba(165,180,252,.12);font-size:14px;color:#d7dbee}
.quick li span:first-child{color:#fff;font-weight:700}
.fourRules{border-color:rgba(250,204,21,.6);box-shadow:0 0 0 1px rgba(250,204,21,.12),0 0 28px rgba(250,204,21,.14)}
.fourRules h3{color:#fde68a}
.fourRules ol{margin:0;padding-left:20px;color:#d7dbee;font-size:14px}
.fourRules li{margin:0 0 10px;line-height:1.55}
.fourRules strong{color:#fff}
.cheat{margin-top:20px;border-color:rgba(247,120,186,.55);box-shadow:0 0 0 1px rgba(247,120,186,.12),0 0 28px rgba(247,120,186,.16)}
.cheat p{margin:0;font-size:16px;color:#e0e4f5}
.refSign{text-align:center;margin:26px 0 0;font-size:20px;font-weight:900;letter-spacing:.06em;color:#7ee787;text-shadow:0 0 18px rgba(126,231,135,.35)}
@media(max-width:1100px){.tgrid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:900px){.refTop,.refPanels{grid-template-columns:1fr}.params{grid-template-columns:1fr}.tgrid{grid-template-columns:repeat(2,1fr)}.formula{white-space:normal}}
@media(max-width:420px){.tgrid{gap:10px}.tcard{padding:12px}.trule{font-size:16px}.memory{font-size:13px}.memory th,.memory td{padding:7px 6px}.quick li{grid-template-columns:92px 1fr}}

/* Free study guides */
.guides{background:var(--earth-canvas);color:var(--ink)}
#study-guides h2{font-family:Georgia,serif}
.guideGrid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:30px}
.guideCard{background:#fff;border:1px solid var(--line);border-radius:22px;overflow:hidden;display:flex;flex-direction:column;box-shadow:0 10px 30px #0f172a0d}
.guideCover{display:block;background:linear-gradient(160deg,#1c2541,#0b132b);padding:24px 28px 0;height:250px;overflow:hidden}
.guideCover img{display:block;width:100%;height:auto;border-radius:4px 4px 0 0;box-shadow:0 10px 30px rgba(0,0,0,.4)}
.guideBody{padding:22px;display:flex;flex-direction:column;gap:8px;flex:1}
.guideMeta{font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:#667085}
.guideBody h3{color:var(--star-electric);margin:0}
.guideBody p{color:#667085;margin:0}
.guideBody .btns{margin-top:auto;padding-top:14px}
@media(max-width:900px){.guideGrid{grid-template-columns:1fr}.guideCover{height:220px}}

/* Topic bubbles are links */
.tagrow a.tag:hover,.tagrow a.tag:focus-visible{background:rgba(79,70,229,.45);border-color:#a5b4fc}

/* Algebra reference: tap a card or box to see it larger */
.svgDefs{position:absolute;width:0;height:0;overflow:hidden}
.refHint{color:#aab0c8;font-size:14px;margin:-6px 0 14px}
#reference .tcard,#reference .neon{cursor:zoom-in}
#reference .tcard:hover,#reference .neon:hover{border-color:#a5b4fc;box-shadow:0 0 0 1px rgba(165,180,252,.4),0 0 32px rgba(79,70,229,.35)}
#reference .tcard:focus-visible,#reference .neon:focus-visible{outline:3px solid #a5b4fc;outline-offset:3px}
.zoomBox{position:fixed;inset:0;z-index:100;display:flex;padding:28px 16px;overflow:auto;background:rgba(3,7,18,.88)}
.zoomBox[hidden]{display:none}
.zoomInner{position:relative;margin:auto;width:min(760px,100%)}
#reference .zoomBody>*{cursor:default}
.zoomBody .tcard{align-items:center;text-align:center;padding:28px;gap:8px}
.zoomBody .mini{max-width:360px}
.zoomBody .trule{font-size:30px}
.zoomBody .tname{font-size:15px}
.zoomBody .teffect{font-size:19px}
.zoomBody .tex{font-size:17px}
.zoomClose{position:absolute;top:-14px;right:-8px;z-index:2;width:44px;height:44px;border-radius:50%;border:1px solid rgba(165,180,252,.7);background:#0b132b;color:#fff;font-size:26px;line-height:1}
@media(min-width:700px){.zoomBody .neon{zoom:1.25}}

/* Study guides: subject links */
.guideCats{color:#667085;margin:0 0 16px}
.guideCats a{color:var(--star-electric);font-weight:700;text-decoration:underline;text-underline-offset:3px}

/* Essay review */
.essay{background:linear-gradient(135deg,var(--star-navy),var(--star-indigo));color:#fff}
#essay h2{font-family:Georgia,serif}
.essay .lead{color:#cbd5e1}
.essaySteps{margin:0;padding:22px 24px 22px 46px;background:rgba(255,255,255,.05);border:1px solid rgba(165,180,252,.3);border-radius:22px;color:#d7dbee}
.essaySteps li{line-height:1.7;margin:10px 0}
.essaySteps strong{color:#fff}
.essaySteps a{color:#c7d2fe;text-decoration:underline;text-underline-offset:3px;overflow-wrap:anywhere}

/* Teacher photo */
.teacherPhoto{position:relative;width:220px;margin:26px 0 0}
.teacherPhoto:before{content:"";position:absolute;inset:14px -14px -14px 14px;border:1px solid rgba(79,70,229,.35);border-radius:4px;pointer-events:none}
.teacherPhoto img{position:relative;display:block;width:100%;height:auto;border-radius:4px;box-shadow:0 18px 40px rgba(15,23,42,.18)}
@media(max-width:900px){.teacherPhoto{width:180px;margin-bottom:14px}}

/* Course outlines */
.courseOutline ol{padding-left:20px;margin:8px 0}
.starSite .courseOutline summary{color:var(--star-electric)}

/* Course page: Foundational Mathematics for Science */
.coursePage main>section:nth-of-type(odd){background:#fff;color:var(--ink)}
.coursePage main>section:nth-of-type(even){background:var(--earth-canvas);color:var(--ink)}
.coursePage main>section{padding:64px 0}
.coursePage h2{font-family:Georgia,serif}
.coursePage h3{font-size:18px;margin:26px 0 10px}
.courseHero{background:linear-gradient(135deg,var(--star-navy),var(--star-indigo));color:#fff;padding:48px 0 52px}
.courseHero h1{font:500 clamp(36px,5vw,58px)/1.06 Georgia,serif;margin:12px 0 14px}
.courseHero .lead{color:#c7cbe0;max-width:720px;font-size:19px}
.crumbLink{display:inline-block;color:#a5b4fc;font-weight:700;font-size:14px;margin-bottom:18px}
.statRow{list-style:none;padding:0;margin:24px 0;display:flex;flex-wrap:wrap;gap:12px}
.statRow li{min-width:120px;background:rgba(255,255,255,.06);border:1px solid rgba(165,180,252,.35);border-radius:14px;padding:12px 18px;color:#c7cbe0;font-size:14px}
.statRow strong{display:block;font-size:30px;line-height:1.1;color:#fff}
.heroNote{color:#aab0c8;font-size:14px;margin:16px 0 0}
.tableWrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
.unitTable{min-width:640px}
.cycle{padding-left:22px;max-width:820px}
.cycle li{line-height:1.7;margin:8px 0}
.routine{background:#eef2ff;border-left:3px solid var(--star-electric);border-radius:0 12px 12px 0;padding:14px 18px;max-width:820px}
.unitBlock{background:#fff;border:1px solid var(--line);border-radius:16px;margin:0 0 14px;overflow:hidden}
.unitBlock summary{cursor:pointer;padding:18px 22px;font-size:19px;font-weight:800;display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 12px}
.unitBlock summary:focus-visible{outline:3px solid #818cf8;outline-offset:-3px}
.unitNum{font-size:12px;font-weight:900;letter-spacing:.12em;text-transform:uppercase;color:var(--star-electric)}
.unitWeeks{font-size:14px;font-weight:600;color:#667085}
.unitLink{margin:0 22px 14px;font-size:14px}
.unitLink a{color:var(--star-electric);font-weight:700}
.weekGrid{display:grid;grid-template-columns:1fr 1fr;gap:14px;padding:0 22px 22px}
.week{background:var(--earth-canvas);border:1px solid var(--line);border-radius:12px;padding:16px 18px}
.week h4{margin:0 0 10px;font-size:16px;line-height:1.35}
.week h4 span{display:block;font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--star-electric)}
.week dl{margin:0;display:grid;grid-template-columns:118px 1fr;gap:6px 12px;font-size:14px;line-height:1.55}
.week dt{font-weight:800;color:#475467}
.week dd{margin:0;color:#344054}
.outcomes{margin:0;padding:22px 24px 22px 44px;background:#fff;border:1px solid var(--line);border-radius:22px}
.outcomes li,.assess li,.formulas li{line-height:1.65;margin:8px 0}
.assess,.formulas{max-width:880px;padding-left:20px}
.formulaTitle{margin-top:30px}
.coursePage .note-box{background:#eef2ff;border-left-color:var(--star-electric);color:#344054}
@media(max-width:800px){.weekGrid{grid-template-columns:1fr}.week dl{grid-template-columns:1fr;gap:2px}.week dd{margin-bottom:8px}}
.courseHero .btnGhost{color:#e0e7ff;border-color:rgba(165,180,252,.6)}

/* Menu (nav.js): one row of dropdowns on wide screens; a Menu button that opens a sheet on narrow screens */
.starNav .navList{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.starNav .navItem{position:relative}
.navTrigger,.navLink{display:flex;align-items:center;gap:7px;padding:8px 11px;border:0;border-radius:8px;background:none;color:#cbd5e1;font:inherit;font-size:14px;font-weight:500;line-height:1.2;white-space:nowrap;cursor:pointer}
.navTrigger:after{content:"";width:6px;height:6px;margin-top:-3px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;opacity:.75;transform:rotate(45deg);transition:transform .2s ease,margin .2s ease}
.navItem.open .navTrigger:after{margin-top:3px;transform:rotate(-135deg)}
.navTrigger:hover,.navLink:hover,.navItem.open .navTrigger{color:#fff;background:rgba(255,255,255,.08)}
.navTrigger:focus-visible,.navLink:focus-visible,.menuBtn:focus-visible,.navPanel a:focus-visible{outline:2px solid var(--star-violet);outline-offset:2px}
.navPanel{position:absolute;top:calc(100% + 14px);left:50%;z-index:60;width:max-content;max-width:calc(100vw - 32px);padding:8px;border-radius:14px;background:#fff;color:var(--ink);box-shadow:0 22px 50px rgba(3,7,18,.38),0 2px 8px rgba(3,7,18,.14);visibility:hidden;opacity:0;transform:translate(-50%,-6px);transition:opacity .18s ease,transform .18s ease,visibility 0s linear .18s}
.navItem.open .navPanel{visibility:visible;opacity:1;transform:translate(-50%,0);transition:opacity .18s ease,transform .18s ease}
.navPanel:before{content:"";position:absolute;left:0;right:0;top:-16px;height:16px}
.navPanel:after{content:"";position:absolute;top:-5px;left:50%;width:11px;height:11px;margin-left:-5.5px;border-radius:2px;background:#fff;transform:rotate(45deg)}
.panelGrid,.panelList{list-style:none;margin:0;padding:0}
.panelGrid{display:grid;grid-template-columns:repeat(2,250px);gap:2px}
.panelList{display:grid;gap:2px;width:290px}
.panelGrid a,.panelList a{display:block;padding:11px 12px;border-radius:9px;color:var(--ink)}
.panelGrid a:hover,.panelList a:hover{background:#eef2ff}
.panelGrid strong,.panelList strong{display:block;margin-bottom:3px;font-size:14.5px;font-weight:650;line-height:1.3}
.panelGrid a:hover strong,.panelList a:hover strong{color:var(--star-electric)}
.panelGrid span,.panelList span{display:block;font-size:13px;line-height:1.45;color:#667085}
.panelFoot{display:block;margin:6px 4px 2px;padding:11px 8px 6px;border-top:1px solid #eaecf0;font-size:13.5px;font-weight:650;color:var(--star-electric)}
.panelFoot:hover{text-decoration:underline}
.panelSplit{display:grid;grid-template-columns:210px auto;gap:6px}
.panelFeature{display:flex;flex-direction:column;padding:18px;border-radius:10px;background:linear-gradient(160deg,var(--star-navy),#312e81);color:#fff}
.panelFeature .mark{width:34px;height:34px;margin-bottom:auto}
.panelFeature strong{margin:18px 0 6px;font-size:17px;line-height:1.25}
.panelFeature span:last-child{font-size:13px;line-height:1.45;color:#c7d2fe}
.panelFeature:hover strong{text-decoration:underline}
.menuBtn{display:none}
.feature[id]{scroll-margin-top:90px}
@media(prefers-reduced-motion:reduce){.navPanel,.navItem.open .navPanel,.navTrigger:after{transition:none}}
/* The tagline under the logo steps aside where space is tight */
@media(max-width:480px),(min-width:1061px) and (max-width:1160px){.topbar .brand small{display:none}}
@media(max-width:1060px){
  .starNav{display:none}
  .menuBtn{display:inline-flex;align-items:center;justify-content:center;width:42px;height:42px;margin-left:auto;padding:0;border:1px solid rgba(255,255,255,.24);border-radius:999px;background:transparent;color:#fff;cursor:pointer}
  .menuBtn svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round}
  .nav.menuOpen .menuBtn{background:#fff;color:var(--star-deep)}
  .nav.menuOpen .starNav{display:block;position:absolute;top:100%;left:0;right:0;max-height:calc(100vh - 70px);overflow-y:auto;padding:4px 20px 20px;background:#fff;color:var(--ink);box-shadow:0 24px 40px rgba(3,7,18,.45)}
  .starNav .navList{flex-direction:column;align-items:stretch;gap:0}
  .navTrigger,.navLink{width:100%;justify-content:space-between;padding:15px 2px;border-bottom:1px solid #eaecf0;border-radius:0;color:var(--ink);font-size:16px;font-weight:600}
  .navTrigger:hover,.navLink:hover,.navItem.open .navTrigger{background:none;color:var(--star-electric)}
  .navPanel{position:static;display:none;width:auto;max-width:none;padding:6px 0 10px;border-radius:0;box-shadow:none;visibility:visible;opacity:1;transform:none;transition:none}
  .navItem.open .navPanel{display:block;transform:none}
  .navPanel:before,.navPanel:after{content:none}
  .panelGrid,.panelSplit{grid-template-columns:1fr}
  .panelList{width:auto}
  .panelGrid a,.panelList a{padding:10px 8px}
  .panelFeature{padding:14px}
  .panelFeature .mark{display:none}
  .panelFeature strong{margin:0 0 4px}
}

/* ESL: wide course card, level cards, curriculum lists, and the contact box beside How to enroll */
.pair>.eslFeature{grid-column:1/-1}
.levelGrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(260px,100%),1fr));gap:20px;margin-top:26px}
.levelCard h3{margin:10px 0 8px}
.levelCard p{margin:0;color:#475467;line-height:1.6}
.levelTag{display:inline-block;padding:4px 10px;border-radius:999px;background:#eef2ff;color:var(--star-electric);font-size:13px;font-weight:700}
.unitBlock summary small{font-size:14px;font-weight:600;color:#667085}
.unitBody{padding:0 22px 20px}
.weekList,.topicList{margin:0;padding-left:22px;line-height:1.65}
.weekList li,.topicList li{margin:7px 0}
.eslContact{margin-top:28px;max-width:760px}
.enrollGrid{display:grid;grid-template-columns:1fr minmax(0,520px);gap:40px;align-items:start}
@media(max-width:900px){.enrollGrid{grid-template-columns:1fr}}


/* Phone layouts: keep content readable and controls easy to reach. */
:root{--site-header-height:71px}
.topbar .brand,.heroContent,.feature,.day,.neon,.refStack,.tcard{min-width:0}
.menuBtn{flex-shrink:0}
.navcta{display:inline-flex;align-items:center;justify-content:center;min-height:44px}
main section[id],.feature[id]{scroll-margin-top:calc(var(--site-header-height) + 16px)}
@media(max-width:1060px){
  .menuBtn{width:44px;height:44px}
  .nav.menuOpen .starNav{max-height:calc(100dvh - var(--site-header-height));overscroll-behavior:contain;padding-bottom:max(20px,env(safe-area-inset-bottom))}
}
@media(max-width:620px){
  .topbar .nav{gap:12px}
  .topbar .brand{gap:9px;font-size:12px}
  .topbar .brand small{display:none}
  .topbar .mark{width:34px;height:34px}
  .hero.single .heroPanel{min-height:0;padding:48px 22px 52px}
  .hero h1{font-size:clamp(36px,10vw,52px);line-height:1.04;text-wrap:balance}
  .hero p{font-size:17px;line-height:1.65}
  .tagrow{gap:8px}
  .tagrow .tag{display:inline-flex;align-items:center;min-height:44px;font-size:13px;padding:9px 13px}
  .actions .button{min-height:48px}
  .statement{padding:44px 0}
  .feature,.day{padding:22px 18px;border-radius:18px}
  .feature .btns,.guideBody .btns{flex-direction:column;align-items:stretch}
  .btn{min-height:48px;text-align:center}
  .facts{grid-template-columns:52px minmax(0,1fr);gap:10px 12px;font-size:15px}
  .courseOutline summary{padding:10px 0;min-height:44px}
  .refTop,.refPanels{gap:16px}
  .neon{padding:20px 16px}
  .formula{font-size:clamp(22px,6.4vw,34px)}
  .tgrid{grid-template-columns:1fr;gap:14px}
  .tcard{display:grid;grid-template-columns:104px minmax(0,1fr);column-gap:16px;row-gap:5px;padding:18px 14px;align-items:center}
  .tcard .mini{grid-column:1;grid-row:1 / 5;width:100%;margin:0}
  .tcard>span{grid-column:2}
  .trule{font-size:20px;line-height:1.35}
  .tname{font-size:11px;letter-spacing:.05em}
  .teffect,.tex{font-size:14px;line-height:1.5}
  .memory thead{display:none}
  .memory tbody,.memory tr,.memory td{display:block}
  .memory tr{display:grid;grid-template-columns:1fr auto;gap:6px 10px;padding:14px 0;border-bottom:1px solid rgba(165,180,252,.2)}
  .memory td{border:0;padding:0;font-size:15px;line-height:1.5}
  .memory td:first-child{color:#a5b4fc}
  .memory td:nth-child(2){text-align:right;font-size:16px}
  .memory td:last-child{grid-column:1/-1}
  .quick li{grid-template-columns:100px minmax(0,1fr);font-size:15px;padding:10px 0}
  .fourRules ol{font-size:16px}
  .zoomBox{padding:16px 12px;overscroll-behavior:contain}
  .zoomInner{width:100%}
  .zoomClose{position:sticky;top:0;display:block;margin:0 0 10px auto;right:auto;box-shadow:0 4px 20px #0008}
  .zoomBody .tcard{display:flex;padding:24px 18px}
  .zoomBody .tcard .mini{width:min(100%,320px)}
  .zoomBody .trule{font-size:28px}
  .zoomBody .tname{font-size:14px}
  .zoomBody .tex{font-size:17px}
  .zoomBody .neon{padding:24px 18px}
  .courseHero{padding:32px 0 40px}
  .courseHero h1{font-size:clamp(32px,9vw,46px)}
  .statRow{gap:8px}.statRow li{min-width:0;flex:1 1 40%;padding:12px}
  .weekGrid{padding:0 14px 14px}.week{padding:16px}
  .unitBlock summary{padding:18px 16px}
  .unitBody{padding:0 16px 20px}
}
@media(max-width:350px){
  .topbar .nav{gap:8px}.topbar .brand{font-size:11px;gap:7px}.topbar .mark{width:28px;height:28px}
  .navcta{padding:10px 12px}
  .tcard{grid-template-columns:82px minmax(0,1fr);column-gap:12px}
  .trule{font-size:18px}
}

/* ---- Phone layout: fewer screens of scrolling (v11) ---- */
.swipeHint,.foldNote,.credsToggle{display:none}
@media(max-width:640px){
  /* Long card stacks become side-swipe rows */
  .swipe{display:flex!important;grid-template-columns:none!important;gap:12px;overflow-x:auto;overscroll-behavior-x:contain;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;scrollbar-width:none;margin-left:-20px!important;margin-right:-20px!important;padding:4px 20px 6px!important;scroll-padding-left:20px}
  .swipe::-webkit-scrollbar{display:none}
  .swipe>*{flex:0 0 86%;max-width:340px;scroll-snap-align:start}
  .swipeHint{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:8px 0 0;font-size:13px;color:#667085}
  .swipeHint b{font-weight:600}
  .swipeHint .swipeDots{display:flex;gap:5px}
  .swipeHint .swipeDots i{width:6px;height:6px;border-radius:50%;background:currentColor;opacity:.3}
  .swipeHint .swipeDots i.on{opacity:1}
  #reference .swipeHint,#ideas .swipeHint{color:#a5b4fc}

  /* Courses */
  #courses .pair{margin-top:20px;align-items:stretch}
  #courses .feature{padding:20px}

  /* Transformation graphs: compact cards */
  #reference .tgrid>*{flex-basis:58%;max-width:230px}
  #reference .tgrid .tcard{display:flex;flex-direction:column;align-items:center;text-align:center;gap:3px;padding:14px 12px}
  #reference .tgrid .tcard .mini{width:118px;height:118px;margin:0 0 6px}
  #reference .refTitle{margin-bottom:4px}
  #reference .refHint{margin-top:0}

  /* Timeline: cards instead of a long vertical line */
  .constellation.swipe{border-left:0;margin:24px -20px!important}
  .constellation.swipe li{padding:20px;border:1px solid rgba(165,180,252,.28);border-radius:16px;background:rgba(11,19,43,.6)}
  .constellation.swipe li:before{position:static;display:block;margin:0 0 12px}

  /* Study guide cards */
  .guideGrid.swipe .guideCover{height:180px}

  /* Two reference tables repeat the four rules: show a title, tap to open */
  #reference .foldPhone{padding:18px 20px}
  #reference .foldPhone>:not(h3){display:none}
  #reference .foldPhone h3{margin:0}
  #reference .foldPhone .foldNote{display:block;margin:6px 0 0;font-size:14px;color:#a5b4fc}
  #reference .zoomBody .foldPhone>*{display:revert}
  #reference .zoomBody .foldNote{display:none}

  /* Teacher credentials: first four, then a button */
  .credsFold:not(.open) li:nth-child(n+5){display:none}
  .credsFold:not(.open) li:nth-child(4){border-bottom:0}
  .credsFold{border-bottom-left-radius:0;border-bottom-right-radius:0;border-bottom:0}
  .credsToggle{display:block;width:100%;margin:0;padding:14px;border:1px solid var(--line);border-radius:0 0 22px 22px;background:#fff;font:inherit;font-weight:600;color:var(--star-electric,#4f46e5);cursor:pointer}

  /* Study guide library: shorter entries */
  .libEntry>div>p:not(.libLinks){display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
}
@media(max-width:640px) and (prefers-reduced-motion:reduce){.swipe{scroll-behavior:auto}}

.essayRule{margin:0 0 18px;padding:12px 16px;border-left:3px solid #a5b4fc;background:rgba(165,180,252,.1);border-radius:0 12px 12px 0;color:#e0e4f5;font-weight:600}