:root{
  --ink:#1d2527;--ink-soft:#556063;--paper:#f2f0ea;--paper-2:#e9e6de;
  --surface:#f8f7f3;--line:#d6d2c8;--petrol:#2f5c60;--petrol-soft:#dfe9e7;
  --gold:#9b7541;--ok:#3f6b58;--error:#8a4b45;--shadow:0 22px 60px rgba(33,43,44,.09);
  --display:'EB Garamond',Georgia,serif;--sans:'Instrument Sans',system-ui,sans-serif;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:inherit}button,input,select,textarea{font:inherit}a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid rgba(47,92,96,.45);outline-offset:3px}.skip{position:absolute;left:-9999px}.skip:focus{left:16px;top:16px;z-index:100;background:#fff;padding:10px 14px;border-radius:8px}
.topbar{position:sticky;top:0;z-index:40;border-bottom:1px solid rgba(67,76,76,.13);background:rgba(242,240,234,.91);backdrop-filter:blur(16px)}
.topbar-inner{max-width:1460px;margin:auto;min-height:68px;padding:0 28px;display:flex;align-items:center;gap:28px}.brand{text-decoration:none;font-weight:750;font-size:12px;letter-spacing:.15em;white-space:nowrap}.brand span{color:var(--petrol)}
.portal-nav{display:flex;gap:4px;margin-left:auto}.portal-nav a{text-decoration:none;padding:9px 12px;border-radius:999px;font-size:13px;color:var(--ink-soft)}.portal-nav a:hover,.portal-nav a[aria-current=page]{background:var(--surface);color:var(--ink);box-shadow:0 0 0 1px var(--line)}
.home-link{text-decoration:none;font-size:13px;color:var(--ink-soft)}
.portal-hero{max-width:1460px;margin:auto;padding:92px 28px 54px;display:grid;grid-template-columns:minmax(0,1.2fr) minmax(320px,.8fr);gap:70px;align-items:end}
.kicker{font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--petrol);font-weight:750}.portal-hero h1,.section-heading h1{font-family:var(--display);font-size:clamp(52px,7vw,100px);font-weight:500;line-height:.92;letter-spacing:-.04em;margin:18px 0 26px}.portal-hero p,.section-heading p{font-family:var(--display);font-size:clamp(20px,2.1vw,30px);line-height:1.35;color:var(--ink-soft);margin:0;max-width:800px}
.hero-note{border-left:1px solid var(--gold);padding:8px 0 8px 24px;color:var(--ink-soft);font-size:14px}.hero-note strong{display:block;color:var(--ink);font-family:var(--display);font-size:24px;font-weight:600;margin-bottom:4px}
.portal-main{max-width:1460px;margin:auto;padding:22px 28px 100px}.path-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.path-card{min-height:300px;background:rgba(248,247,243,.7);border:1px solid var(--line);border-radius:18px;padding:28px;text-decoration:none;display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s,border-color .2s}.path-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#b9b4a8}.path-card .num{font-family:var(--display);font-size:20px;color:var(--gold)}.path-card h2{font-family:var(--display);font-size:34px;font-weight:550;margin:auto 0 10px}.path-card p{font-size:14px;color:var(--ink-soft);margin:0}.path-card .go{margin-top:24px;font-size:13px;color:var(--petrol);font-weight:700}
.coverage-strip{margin-top:18px;border:1px solid var(--line);border-radius:18px;background:var(--paper-2);padding:28px;display:grid;grid-template-columns:1fr auto;gap:30px;align-items:center}.coverage-strip h2{font-family:var(--display);font-size:30px;margin:0 0 6px}.coverage-strip p{margin:0;color:var(--ink-soft);font-size:14px;max-width:820px}
.levels{display:flex;flex-wrap:wrap;gap:8px}.level-chip{border:1px solid #c9c5bb;border-radius:999px;padding:8px 11px;background:rgba(255,255,255,.45);font-size:12px;white-space:nowrap}
.section-heading{max-width:1460px;margin:auto;padding:56px 28px 32px}.section-heading h1{font-size:clamp(43px,5vw,72px);margin-bottom:18px}.section-heading p{font-size:22px;max-width:900px}
.learning-shell{max-width:1460px;margin:0 auto 80px;padding:0 28px;display:grid;grid-template-columns:230px minmax(520px,1fr) 270px;gap:18px;align-items:start}
.sidepanel,.practice,.rightpanel{border:1px solid var(--line);border-radius:18px;background:rgba(248,247,243,.72)}.sidepanel,.rightpanel{position:sticky;top:88px;padding:18px}.panel-label{font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-soft);font-weight:750;margin:0 0 12px}
.year-list{display:grid;gap:5px}.year-btn{width:100%;border:0;border-radius:10px;background:transparent;color:var(--ink-soft);text-align:left;padding:10px 11px;cursor:pointer;display:flex;justify-content:space-between;gap:8px}.year-btn:hover{background:var(--paper-2)}.year-btn.active{background:var(--petrol);color:#fff}.year-btn small{opacity:.72}
.panel-rule{height:1px;background:var(--line);margin:18px 0}.side-link{border:0;background:none;padding:0;color:var(--petrol);font-size:13px;font-weight:700;cursor:pointer;text-decoration:underline;text-decoration-color:rgba(47,92,96,.28);text-underline-offset:4px}
.practice{min-height:590px;padding:clamp(26px,4vw,54px);box-shadow:0 8px 30px rgba(43,50,51,.04)}.practice-top{display:flex;align-items:flex-start;justify-content:space-between;gap:24px;margin-bottom:32px}.station{font-size:11px;letter-spacing:.15em;text-transform:uppercase;color:var(--petrol);font-weight:750}.progress-text{font-size:12px;color:var(--ink-soft);white-space:nowrap}.progress-track{height:3px;background:var(--paper-2);border-radius:9px;margin-top:7px;overflow:hidden}.progress-fill{height:100%;width:0;background:var(--petrol);transition:width .3s}
.topic{font-family:var(--display);font-size:18px;color:var(--gold);margin-bottom:8px}.prompt{font-family:var(--display);font-size:clamp(28px,3vw,40px);font-weight:550;line-height:1.18;letter-spacing:-.015em;margin:0 0 18px}.context{color:var(--ink-soft);font-size:14px;margin-bottom:26px}.visual-wrap{display:none;margin:10px 0 26px;border:1px solid var(--line);border-radius:14px;background:#fff;padding:14px}.visual-wrap.visible{display:block}.visual-wrap canvas{display:block;width:100%;height:210px}
.answer-zone{display:grid;gap:12px;margin-top:24px}.answer-input{width:100%;border:1px solid #bdb8ae;border-radius:12px;background:#fff;padding:15px 16px;color:var(--ink);outline:none}.answer-input:focus{border-color:var(--petrol);box-shadow:0 0 0 3px rgba(47,92,96,.12)}.choices{display:grid;grid-template-columns:1fr 1fr;gap:10px}.choice{border:1px solid #c7c2b8;border-radius:12px;background:#fff;padding:13px 14px;text-align:left;cursor:pointer}.choice:hover,.choice.selected{border-color:var(--petrol);background:var(--petrol-soft)}
.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}.primary,.secondary,.quiet{border-radius:10px;padding:12px 17px;cursor:pointer;font-weight:700;font-size:13px}.primary{border:1px solid var(--petrol);background:var(--petrol);color:#fff}.primary:hover{background:#244c50}.secondary{border:1px solid #bdb8ae;background:#fff;color:var(--ink)}.quiet{border:0;background:transparent;color:var(--petrol)}
.feedback{display:none;margin-top:22px;border-radius:12px;padding:15px 17px;font-size:14px}.feedback.visible{display:block}.feedback.ok{background:#e3ece6;color:#294b3b}.feedback.error{background:#f1e4e1;color:#6f3832}.feedback strong{display:block;margin-bottom:3px}.solution{display:none;margin-top:18px;border-top:1px solid var(--line);padding-top:18px}.solution.visible{display:block}.solution ol{padding-left:20px;color:var(--ink-soft)}
.rightpanel h2{font-family:var(--display);font-size:22px;margin:0 0 8px}.rightpanel p{font-size:13px;color:var(--ink-soft);margin:0}.route-list{list-style:none;padding:0;margin:16px 0 0;display:grid;gap:11px}.route-list li{display:grid;grid-template-columns:24px 1fr;gap:8px;font-size:12px;color:var(--ink-soft)}.route-list .dot{width:22px;height:22px;border:1px solid #c9c5bb;border-radius:50%;display:grid;place-items:center;font-size:10px}.route-list li.done .dot{background:var(--ok);border-color:var(--ok);color:#fff}.route-list li.current{color:var(--ink);font-weight:700}
.stat-row{display:grid;grid-template-columns:1fr 1fr;gap:8px}.stat{background:var(--paper-2);border-radius:10px;padding:12px}.stat strong{font-family:var(--display);font-size:24px;display:block}.stat span{font-size:10px;color:var(--ink-soft);text-transform:uppercase;letter-spacing:.08em}
.equation-launch{max-width:1100px;margin:0 auto 100px;padding:0 28px}.launch-card{border:1px solid var(--line);background:var(--surface);border-radius:20px;padding:clamp(30px,5vw,64px);display:grid;grid-template-columns:1fr auto;gap:40px;align-items:center;box-shadow:var(--shadow)}.launch-card h2{font-family:var(--display);font-size:40px;margin:0 0 10px}.launch-card p{margin:0;color:var(--ink-soft)}.launch-btn{display:inline-block;text-decoration:none;background:var(--petrol);color:#fff;padding:14px 20px;border-radius:10px;font-weight:750;font-size:14px;white-space:nowrap}
.roadmap{max-width:1100px;margin:0 auto 80px;padding:0 28px}.roadmap h2{font-family:var(--display);font-size:36px}.roadmap-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.roadmap-item{border:1px solid var(--line);border-radius:14px;padding:18px;background:rgba(248,247,243,.7)}.roadmap-item strong{font-family:var(--display);font-size:21px}.roadmap-item p{font-size:13px;color:var(--ink-soft);margin:5px 0 0}
.modal{border:0;border-radius:18px;padding:0;max-width:min(900px,calc(100vw - 32px));width:100%;color:var(--ink);background:var(--surface);box-shadow:0 30px 90px rgba(0,0,0,.24)}.modal::backdrop{background:rgba(25,30,31,.45);backdrop-filter:blur(4px)}.modal-head{display:flex;justify-content:space-between;gap:20px;padding:24px 26px;border-bottom:1px solid var(--line)}.modal-head h2{font-family:var(--display);font-size:30px;margin:0}.close-modal{border:0;background:var(--paper-2);border-radius:50%;width:36px;height:36px;cursor:pointer}.modal-body{padding:26px;max-height:70vh;overflow:auto}.coverage-table{width:100%;border-collapse:collapse;font-size:13px}.coverage-table th,.coverage-table td{text-align:left;vertical-align:top;padding:13px 10px;border-bottom:1px solid var(--line)}.coverage-table th{font-size:10px;text-transform:uppercase;letter-spacing:.1em;color:var(--ink-soft)}
.site-footer{border-top:1px solid var(--line);max-width:1460px;margin:auto;padding:30px 28px 46px;display:flex;justify-content:space-between;gap:30px;color:var(--ink-soft);font-size:12px}.site-footer nav{display:flex;flex-wrap:wrap;gap:15px}.site-footer a{text-decoration:none}.site-footer a:hover{color:var(--petrol)}
.olympic-link{display:block;margin-top:11px;border:1px solid #b9c8c5;background:var(--petrol-soft);border-radius:10px;padding:10px 11px;text-decoration:none;color:var(--petrol);font-size:12px;font-weight:750}.olympic-link:hover{background:#d5e3e0}
.olympic-shell{max-width:1460px;margin:0 auto 90px;padding:0 28px;display:grid;grid-template-columns:260px minmax(0,1fr);gap:18px;align-items:start}.olympic-menu{border:1px solid var(--line);border-radius:18px;background:rgba(248,247,243,.72);padding:18px;position:sticky;top:88px}.league-title{font-family:var(--display);font-size:20px;margin:18px 0 7px}.league-title:first-of-type{margin-top:0}.league-list{display:grid;gap:5px}.league-btn{border:0;background:transparent;border-radius:9px;padding:9px 10px;text-align:left;cursor:pointer;color:var(--ink-soft);font-size:13px}.league-btn:hover{background:var(--paper-2)}.league-btn.active{background:var(--petrol);color:#fff}
.olympic-stage{border:1px solid var(--line);border-radius:18px;background:var(--surface);padding:clamp(26px,4vw,52px)}.olympic-stage-top{display:flex;justify-content:space-between;gap:18px;align-items:flex-start}.olympic-label{font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--petrol);font-weight:750}.olympic-count{font-size:12px;color:var(--ink-soft)}.tool-tags{display:flex;gap:7px;flex-wrap:wrap;margin:18px 0}.tool-tag{font-size:11px;border:1px solid #c8c4ba;background:var(--paper);padding:6px 9px;border-radius:999px;color:var(--ink-soft)}.olympic-problem{font-family:var(--display);font-size:clamp(27px,3vw,39px);line-height:1.23;margin:20px 0 26px}.olympic-work{border-top:1px solid var(--line);padding-top:22px}.olympic-work label{display:block;font-size:12px;font-weight:700;margin-bottom:8px}.proof-box{width:100%;min-height:112px;resize:vertical;border:1px solid #beb9af;background:#fff;border-radius:12px;padding:14px;line-height:1.5}.hint-stack{display:grid;gap:8px;margin-top:18px}.hint-card{display:none;border-left:3px solid var(--gold);background:var(--paper);padding:13px 15px;font-size:13px;color:var(--ink-soft)}.hint-card.visible{display:block}.olympic-solution{display:none;margin-top:20px;border-radius:14px;background:#e4ece9;padding:18px}.olympic-solution.visible{display:block}.olympic-solution h3{font-family:var(--display);font-size:23px;margin:0 0 7px}.olympic-solution p{font-size:14px;color:#38514b;margin:0;white-space:pre-line}.teacher-note{margin-top:24px;border-top:1px solid var(--line);padding-top:18px;display:grid;grid-template-columns:1fr 1fr;gap:12px}.teacher-note div{border:1px solid var(--line);border-radius:12px;padding:14px}.teacher-note strong{font-size:11px;text-transform:uppercase;letter-spacing:.1em;color:var(--petrol)}.teacher-note p{font-size:12px;color:var(--ink-soft);margin:6px 0 0}
.route-note{font-size:12px;color:var(--ink-soft);margin:0}.route-note a{color:var(--petrol);text-underline-offset:3px}.area-route{display:inline-block;color:var(--petrol);font-size:12px;font-weight:750;text-decoration:none;margin:-10px 0 20px}.area-route:hover{text-decoration:underline;text-underline-offset:4px}
.source-band{max-width:1404px;margin:0 auto 90px;border:1px solid var(--line);border-radius:18px;background:var(--paper-2);padding:28px;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:18px 40px;align-items:end}.source-band h2{font-family:var(--display);font-size:30px;margin:5px 0}.source-band p{font-size:13px;color:var(--ink-soft);margin:0}.source-band nav{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px}.source-band nav a{border:1px solid #c8c4ba;border-radius:999px;background:rgba(255,255,255,.45);padding:8px 11px;text-decoration:none;font-size:12px}.source-band small{grid-column:1/-1;color:var(--ink-soft)}
@media(max-width:1080px){.path-grid{grid-template-columns:1fr 1fr}.learning-shell{grid-template-columns:190px minmax(0,1fr)}.rightpanel{position:static;grid-column:1/-1;display:grid;grid-template-columns:1fr 1fr;gap:20px}.portal-nav{overflow:auto}.home-link{display:none}}
@media(max-width:760px){.topbar-inner{padding:10px 16px;display:grid;grid-template-columns:1fr}.portal-nav{margin:0;width:100%}.portal-nav a{padding:7px 9px}.portal-hero{padding:58px 18px 38px;grid-template-columns:1fr;gap:32px}.portal-main,.section-heading{padding-left:18px;padding-right:18px}.path-grid{grid-template-columns:1fr}.path-card{min-height:220px}.coverage-strip{grid-template-columns:1fr}.learning-shell{padding:0 14px;grid-template-columns:1fr}.sidepanel,.rightpanel{position:static}.year-list{grid-template-columns:repeat(4,1fr)}.year-btn{justify-content:center;text-align:center}.year-btn small{display:none}.practice{padding:26px 20px;min-height:540px}.choices{grid-template-columns:1fr}.rightpanel{display:block}.launch-card{grid-template-columns:1fr}.roadmap-grid{grid-template-columns:1fr}.site-footer{flex-direction:column}.olympic-shell{grid-template-columns:1fr;padding:0 14px}.olympic-menu{position:static}.league-list{grid-template-columns:repeat(3,1fr)}.teacher-note{grid-template-columns:1fr}.source-band{margin:0 14px 60px;grid-template-columns:1fr}.source-band nav{justify-content:flex-start}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}