:root{
  --bg:#07111a;--panel:#0c1823;--panel2:#101f2c;--border:#1d3242;--text:#edf6fb;--muted:#8fa8b8;
  --accent:#62e6cf;--accent2:#7aa7ff;--gold:#f3c969;--danger:#ff8b8b;--sidebar:#08131d;--shadow:0 22px 60px rgba(0,0,0,.24)
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(circle at 70% -10%,#10283a 0,transparent 35%),var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}.app-shell{min-height:100vh;display:grid;grid-template-columns:260px minmax(0,1fr)}.sidebar{position:sticky;top:0;height:100vh;background:rgba(8,19,29,.94);backdrop-filter:blur(15px);border-right:1px solid var(--border);padding:30px 20px;display:flex;flex-direction:column;z-index:20}.brand{display:flex;gap:12px;align-items:center;padding:0 9px 28px}.brand-mark{width:44px;height:44px;border:1px solid rgba(98,230,207,.6);border-radius:14px;display:grid;place-items:center;font-size:22px;font-weight:800;color:var(--accent);box-shadow:inset 0 0 20px rgba(98,230,207,.06)}.brand strong{display:block;font-size:18px}.brand span{display:block;color:var(--muted);font-size:11px;margin-top:3px}.nav-list{display:grid;gap:6px}.nav-item{border:0;background:transparent;color:var(--muted);padding:13px 14px;border-radius:12px;text-align:left;font-size:14px;display:flex;align-items:center;gap:11px;cursor:pointer}.nav-item span{width:20px;text-align:center}.nav-item:hover,.nav-item.active{background:#10222f;color:#fff}.nav-item.active{box-shadow:inset 3px 0 0 var(--accent)}.sidebar-foot{margin-top:auto;padding:12px 8px}.source-chip{background:#0e202d;border:1px solid var(--border);border-radius:12px;padding:12px;font-size:11px;color:var(--muted);line-height:1.5}.source-chip strong{color:var(--accent)}.sidebar-foot p{font-size:10px;line-height:1.45;color:#607b8d}.main{padding:0 42px 56px;min-width:0}.topbar{min-height:106px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid rgba(29,50,66,.65);margin-bottom:36px}.topbar h1{font-size:22px;margin:3px 0 0}.eyebrow{margin:0;color:var(--accent);font-size:10px;letter-spacing:.16em;font-weight:800}.top-actions{display:flex;align-items:center;gap:16px}.streak{display:flex;align-items:center;gap:8px;color:var(--gold)}.streak div{display:flex;flex-direction:column}.streak small{font-size:9px;color:var(--muted)}.avatar{width:38px;height:38px;border-radius:50%;border:1px solid var(--border);background:var(--panel2);color:#fff;font-weight:800}.view{display:none}.active-view{display:block}.hero-grid{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(320px,.8fr);gap:20px}.hero-card,.progress-card,.panel{background:linear-gradient(145deg,rgba(16,31,44,.98),rgba(10,23,33,.98));border:1px solid var(--border);border-radius:18px;box-shadow:var(--shadow)}.hero-card{min-height:300px;padding:36px;display:flex;justify-content:space-between;gap:20px;overflow:hidden;position:relative}.hero-card h2{font-size:34px;line-height:1.08;max-width:600px;margin:10px 0 14px}.hero-card p:not(.eyebrow){max-width:620px;color:var(--muted);line-height:1.6}.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}.primary-button,.secondary-button,.text-button{cursor:pointer}.primary-button{border:0;border-radius:10px;background:var(--accent);color:#062019;font-weight:800;padding:12px 17px}.secondary-button{border:1px solid var(--border);border-radius:10px;background:#0c1b27;color:#dbeaf2;font-weight:700;padding:12px 17px}.text-button{border:0;background:transparent;color:var(--accent);font-weight:700;padding:4px}.orbital-art{width:260px;min-width:260px;align-self:center;aspect-ratio:1;position:relative;display:grid;place-items:center;opacity:.88}.nucleus{width:64px;height:64px;border-radius:50%;display:grid;place-items:center;background:radial-gradient(circle,#6b8cff,#223664);box-shadow:0 0 36px rgba(122,167,255,.35);font-size:24px;font-weight:800}.ring{position:absolute;width:210px;height:92px;border:1px solid rgba(98,230,207,.25);border-radius:50%}.r1{transform:rotate(0deg)}.r2{transform:rotate(60deg)}.r3{transform:rotate(120deg)}.electron{position:absolute;width:9px;height:9px;border-radius:50%;background:var(--accent);box-shadow:0 0 12px var(--accent)}.e1{left:23px;top:122px}.e2{right:49px;top:64px}.e3{right:53px;bottom:64px}.progress-card{padding:28px}.section-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:20px}.section-heading h2,.section-heading h3{margin:5px 0 0}.section-heading h3{font-size:19px}.pill{font-size:11px;color:var(--accent);background:rgba(98,230,207,.09);border:1px solid rgba(98,230,207,.25);border-radius:999px;padding:6px 9px}.progress-track{height:7px;border-radius:99px;background:#172a38;overflow:hidden;margin:22px 0}.progress-track span{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--accent2));border-radius:99px}.muted{color:var(--muted);font-size:12px}.next-lesson{width:100%;display:grid;grid-template-columns:42px 1fr auto;gap:12px;align-items:center;border:1px solid var(--border);background:#0b1a25;color:var(--text);padding:14px;border-radius:13px;text-align:left;cursor:pointer}.next-lesson:hover{border-color:#36596e}.next-lesson small{display:block;color:var(--muted);margin-top:4px}.lesson-icon{width:42px;height:42px;border-radius:11px;display:grid;place-items:center;background:rgba(122,167,255,.12);color:var(--accent2);font-weight:800}.spaced{margin:36px 0 16px}.pathway-strip{display:grid;grid-template-columns:1fr auto 1fr auto 1fr auto 1fr auto 1fr;align-items:center;gap:8px}.pathway-strip>i{color:#365369;font-style:normal}.path-step{min-height:120px;padding:18px;border:1px solid var(--border);background:#0a1722;border-radius:15px;display:flex;flex-direction:column}.path-step span{font-size:10px;color:#627f92;font-weight:800}.path-step strong{margin-top:auto}.path-step small{color:var(--muted);margin-top:5px}.path-step.done{border-color:rgba(98,230,207,.25)}.path-step.done span,.path-step.active span{color:var(--accent)}.path-step.active{background:linear-gradient(160deg,rgba(98,230,207,.09),#0b1924);border-color:rgba(98,230,207,.55)}.dashboard-grid{display:grid;grid-template-columns:1.5fr .7fr;gap:20px;margin-top:20px}.panel{padding:26px}.tool-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:18px}.tool-card{min-height:120px;border:1px solid var(--border);background:#0a1722;border-radius:13px;color:var(--muted);text-align:left;padding:14px;display:flex;flex-direction:column;cursor:default}.tool-card span{font-size:20px;color:#6e8593}.tool-card strong{margin-top:auto;color:#cad7df}.tool-card small{margin-top:5px}.tool-card.enabled{cursor:pointer}.tool-card.enabled:hover{border-color:rgba(98,230,207,.45)}.tool-card.enabled span{color:var(--accent)}.concept-panel p:not(.eyebrow){color:var(--muted);line-height:1.65}.concept-panel h3{font-size:24px;margin:10px 0}.intro-copy{max-width:760px;margin-bottom:28px}.intro-copy h2{font-size:32px;margin:8px 0 10px}.intro-copy p:not(.eyebrow){color:var(--muted);line-height:1.6}.degree-map{display:grid;grid-template-columns:repeat(4,minmax(230px,1fr));gap:15px}.year-column{border:1px solid var(--border);border-radius:16px;background:#0a1722;padding:18px}.year-column>span{font-size:10px;color:var(--accent);letter-spacing:.12em;font-weight:800}.year-column h3{margin:6px 0 20px}.semester{margin-top:15px}.semester>strong{display:block;color:#8ea5b4;font-size:11px;margin-bottom:8px;text-transform:uppercase;letter-spacing:.12em}.degree-course{border-left:2px solid #335065;background:#0d1d29;padding:10px 11px;margin:7px 0;border-radius:0 9px 9px 0}.degree-course.chemistry{border-color:var(--accent)}.degree-course.biochemistry{border-color:#a888ff}.degree-course.biology{border-color:#7ecf87}.degree-course small{display:block;color:var(--muted);font-size:9px;margin-bottom:3px}.degree-course strong{font-size:12px;line-height:1.3}.standards-note{margin-top:20px}.standards-note p{color:var(--muted);line-height:1.55}.course-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.course-card{padding:24px;border:1px solid var(--border);background:#0a1722;border-radius:16px}.course-card .course-code{font-size:10px;color:var(--accent);font-weight:800;letter-spacing:.08em}.course-card h3{font-size:21px;margin:7px 0 8px}.course-card>p{color:var(--muted);line-height:1.5;min-height:45px}.module-list{display:flex;gap:7px;flex-wrap:wrap;margin-top:16px}.module-list span{font-size:10px;border:1px solid var(--border);border-radius:999px;padding:6px 8px;color:#9bb0bd}.course-card.featured{border-color:rgba(98,230,207,.42)}.course-actions{display:flex;justify-content:space-between;align-items:center;margin-top:18px}.course-actions small{color:var(--muted)}.lesson-header{display:flex;justify-content:space-between;gap:30px;margin-bottom:22px}.lesson-header h2{font-size:32px;margin:6px 0 8px}.lesson-header p:not(.eyebrow){color:var(--muted);max-width:720px;line-height:1.5}.lesson-status{align-self:flex-start;display:flex;gap:7px;flex-direction:column;align-items:flex-end}.lesson-status span{font-size:10px;color:var(--accent);border:1px solid rgba(98,230,207,.25);border-radius:999px;padding:6px 9px}.lab-layout{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(300px,.65fr);gap:18px}.molecule-panel{padding:0;overflow:hidden}.model-toolbar{padding:15px 16px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:11px;flex-wrap:wrap}.model-toolbar label{font-size:10px;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);font-weight:800}.model-toolbar select{background:#091722;color:#fff;border:1px solid var(--border);border-radius:9px;padding:9px 11px;min-width:220px}.segmented{margin-left:auto;display:flex;background:#091620;border:1px solid var(--border);border-radius:9px;padding:3px}.seg{border:0;background:transparent;color:var(--muted);padding:7px 10px;border-radius:6px;cursor:pointer}.seg.active{background:#183044;color:#fff}.viewer{height:470px;position:relative;background:radial-gradient(circle at center,#122838,#07121b 70%);overflow:hidden}.viewer canvas{display:block;width:100%;height:100%;touch-action:none;cursor:grab}.viewer canvas:active{cursor:grabbing}.viewer-help{text-align:center;color:#657f90;font-size:10px;margin:0;padding:10px}.model-info{display:grid;gap:14px;align-content:start}.identity-card h3{margin:5px 0 2px}.formula-row{display:flex;align-items:center;justify-content:space-between;gap:10px}.formula-row span:not(.polarity-badge){color:var(--accent);font-weight:700}.polarity-badge{font-size:10px;border:1px solid var(--border);border-radius:999px;padding:6px 8px;color:#b8c8d3}.polarity-badge.polar{border-color:rgba(122,167,255,.5);color:#9ec0ff}.property-list{padding-top:9px;padding-bottom:9px}.property-list div{padding:13px 0;border-bottom:1px solid rgba(29,50,66,.65)}.property-list div:last-child{border-bottom:0}.property-list span{display:block;color:var(--muted);font-size:10px;text-transform:uppercase;letter-spacing:.08em}.property-list strong{display:block;margin-top:4px;font-size:13px}.why-card{background:linear-gradient(145deg,rgba(98,230,207,.06),#0c1924)}.why-card p:last-child{color:#b4c6d1;line-height:1.6}.lesson-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:18px}.lesson-copy h3,.quiz-card h3{font-size:22px;margin:7px 0 16px}.lesson-copy ol{list-style:none;padding:0;margin:0;display:grid;gap:16px}.lesson-copy li{display:flex;gap:14px}.lesson-copy li>span{width:30px;height:30px;min-width:30px;border-radius:50%;display:grid;place-items:center;background:#132b39;color:var(--accent);font-weight:800}.lesson-copy li strong{font-size:14px}.lesson-copy li p{color:var(--muted);margin:4px 0 0;font-size:12px;line-height:1.5}.question{padding:14px 0;border-top:1px solid var(--border)}.question:first-of-type{border-top:0}.question p{font-size:13px;margin:0 0 10px}.answers{display:grid;grid-template-columns:1fr 1fr;gap:7px}.answer{border:1px solid var(--border);background:#0a1722;color:#b8c8d3;border-radius:9px;padding:9px;text-align:left;cursor:pointer}.answer:hover{border-color:#395c72}.answer.selected{border-color:var(--accent);background:rgba(98,230,207,.07);color:#fff}.quiz-submit{margin-top:13px;width:100%}.quiz-result{font-size:12px;margin-top:10px;color:var(--muted)}.quiz-result.good{color:var(--accent)}.quiz-result.bad{color:var(--danger)}.icon-button{border:1px solid var(--border);background:#0e1d29;color:#fff;border-radius:9px;padding:8px 10px}.mobile-only{display:none}
@media(max-width:1100px){.hero-grid,.dashboard-grid,.lab-layout{grid-template-columns:1fr}.orbital-art{width:210px;min-width:210px}.degree-map{grid-template-columns:repeat(2,1fr)}.tool-grid{grid-template-columns:repeat(2,1fr)}.model-info{grid-template-columns:repeat(3,1fr)}.why-card{grid-column:1/-1}}
@media(max-width:780px){.app-shell{display:block}.sidebar{position:fixed;left:-280px;width:260px;transition:left .25s}.sidebar.open{left:0}.main{padding:0 18px 36px}.mobile-only{display:inline-block}.topbar{gap:12px;min-height:90px}.topbar>div:nth-child(2){flex:1}.top-actions .streak{display:none}.hero-card{padding:24px}.hero-card h2{font-size:27px}.orbital-art{display:none}.pathway-strip{grid-template-columns:1fr}.pathway-strip>i{transform:rotate(90deg);text-align:center}.degree-map,.course-grid,.lesson-grid{grid-template-columns:1fr}.model-info{grid-template-columns:1fr}.why-card{grid-column:auto}.viewer{height:380px}.lesson-header{display:block}.lesson-status{align-items:flex-start}.answers{grid-template-columns:1fr}.topbar h1{font-size:17px}}