:root{--blue:#2459e0;--blue-dark:#1e43a9;--blue-light:#eef4ff;--ink:#1b2333;--muted:#697384;--line:#e9ecf2;--canvas:#fbfcfe;--white:#fff;--radius:16px;--sidebar:220px;font-family:'DM Sans',sans-serif;color:var(--ink);font-size:16px;font-synthesis:none}
*{box-sizing:border-box}body{margin:0;background:var(--canvas)}button,input,select,textarea{font:inherit}button,a,input,select,summary{ -webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{cursor:pointer}a{color:inherit;text-decoration:none}button{color:inherit}svg{width:20px;height:20px;vertical-align:middle;flex-shrink:0}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #87a7fb;outline-offset:4px}button:disabled{cursor:default;opacity:.5}h1,h2,h3,h4,p{margin:0}h1,h2,h3,h4,.brand{font-family:'Manrope',sans-serif}h1{font-size:42px;font-weight:750;letter-spacing:-1.8px;line-height:1.18}h2{font-size:21px;letter-spacing:-.55px;font-weight:750}h3{font-size:18px;font-weight:750;letter-spacing:-.4px}p{line-height:1.65}.skip-link{position:fixed;top:-60px;left:20px;background:white;padding:12px;z-index:100}.skip-link:focus{top:12px}.sidebar{width:var(--sidebar);position:fixed;inset:0 auto 0 0;background:white;border-right:1px solid var(--line);padding:34px 20px 20px;display:flex;flex-direction:column;z-index:20}.brand{display:flex;align-items:center;gap:10px;font-size:25px;letter-spacing:-1px;font-weight:800}.brand-mark{display:grid;place-items:center;width:32px;height:34px;background:var(--blue);color:white;border-radius:9px;font-size:27px;line-height:1;padding-bottom:4px}.brand-blue{color:var(--blue)}.school-label{font-size:10px;letter-spacing:1.6px;color:#8a929e;margin:20px 0 33px 2px;font-weight:600}.nav-label{font-size:11px;font-weight:600;letter-spacing:1.4px;color:#8b94a4;margin:28px 0 12px 12px}.nav-item{width:100%;display:flex;align-items:center;gap:12px;font-size:14px;font-weight:500;padding:12px 14px;margin:4px 0;border-radius:9px;color:#657083;transition:background .15s,color .15s}.nav-item svg{width:18px;height:18px}.nav-item:hover{background:#f7f9fc;color:var(--ink)}.nav-item.active{background:var(--blue-light);color:var(--blue);font-weight:650}.nav-item 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svg{width:16px;height:16px}.search-trigger kbd{margin-left:20px;font-family:inherit;font-size:10px;border:1px solid #e1e5ec;border-radius:4px;background:white;padding:2px 4px;white-space:nowrap}.topbar-tag{font-size:10px;letter-spacing:1.2px;color:#8a94a3;font-weight:600}.mobile-menu{display:none!important}main{max-width:1480px;padding:38px 40px 32px;margin:auto;min-height:calc(100vh - 141px)}.page-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:30px}.eyebrow{font-size:11px;letter-spacing:1.6px;text-transform:uppercase;font-weight:600;color:#8b94a4;margin-bottom:14px}.page-heading p{color:var(--muted);font-size:15px;margin-top:12px}.heading-aside{font-size:12px;color:#8e97a5;display:flex;align-items:center;gap:7px;margin-bottom:6px}.heading-aside svg{width:15px;height:15px}.home-layout{display:grid;grid-template-columns:minmax(0,1fr) 258px;gap:28px}.quick-tools{display:grid;grid-template-columns:1.13fr 1fr;gap:16px;margin-bottom:32px}.tool-card{border:1px solid var(--line);border-radius:var(--radius);padding:23px 22px;background:white;min-height:181px;display:flex;flex-direction:column;position:relative;overflow:hidden}.tool-card.practice{background:#eef4ff;border-color:#dfe9ff}.tool-card h3{margin-top:13px;font-size:20px}.tool-card p{font-size:13px;color:var(--muted);margin-top:6px;max-width:240px;line-height:1.6}.tool-card-icon{color:var(--blue)}.tool-card-icon svg{width:23px;height:23px}.tool-card-bottom{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:20px}.tool-meta{font-size:11px;color:#7b8aab}.button{border:0;display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--blue);color:#fff;padding:10px 17px;border-radius:8px;font-size:13px;font-weight:600;line-height:1.4;transition:background .15s,transform 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h3{font-size:21px;line-height:1.35;letter-spacing:-.8px}.rail-card>p{font-size:13px;color:#8590a2;margin-top:10px;line-height:1.65}.core-links{margin-top:22px}.core-link{display:flex;align-items:center;gap:13px;border-top:1px solid var(--line);padding:15px 0;transition:color .15s}.core-link:last-child{padding-bottom:0}.core-link:hover{color:var(--blue)}.core-letter{height:34px;width:34px;background:#f5f7fb;border:1px solid #eef1f6;border-radius:9px;color:#60718c;display:grid;place-items:center;font-size:11px;font-weight:700}.core-link strong{display:block;font-size:13px;font-weight:600}.core-link small{display:block;font-size:11px;color:#969faf;margin-top:3px}.rail-links{margin-top:29px;padding:0 8px}.rail-links .rail-heading{margin-bottom:5px}.rail-resource{display:flex;align-items:center;gap:11px;padding:13px 0;border-bottom:1px solid var(--line);font-size:12px;color:#748095}.rail-resource svg{width:16px;height:16px;color:#8c98ae}.rail-resource:hover{color:var(--blue)}.rail-note{font-size:11px;color:#a0a8b6;line-height:1.6;margin-top:12px}.bottom-strip{margin-top:29px;border:1px solid var(--line);border-radius:12px;padding:20px;display:flex;align-items:center;gap:16px;background:white}.bottom-strip svg{color:#718cba}.bottom-strip strong{font-size:13px;font-weight:600}.bottom-strip p{font-size:12px;color:#8d96a5;margin-top:3px}.bottom-strip .text-button{margin-left:auto;white-space:nowrap;font-size:12px}.site-footer{max-width:1480px;margin:auto;padding:20px 40px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:15px;color:#a0a8b5;font-size:10px}.initial-loading{color:#778295;margin-top:40px}.icon-button{display:inline-grid;place-items:center;border:0;background:transparent;padding:8px;border-radius:7px;color:#8792a3}.icon-button:hover{background:#f1f5fd;color:var(--blue)}.icon-button svg{width:18px;height:18px}.search-dialog{width:560px;max-width:calc(100% - 28px);padding:0;border:1px solid var(--line);border-radius:16px;top:14vh;margin-top:0;box-shadow:0 25px 100px #15234530;color:var(--ink);background:#fff}.search-dialog::backdrop{background:#15223a35;backdrop-filter:blur(3px)}.search-input-wrap{display:flex;align-items:center;gap:14px;padding:18px 20px;border-bottom:1px solid var(--line);color:#8492a9}.search-input-wrap input{border:0;outline:none;min-width:0;flex:1;background:none;font-size:16px;color:var(--ink)}.search-input-wrap input:focus-visible{outline:none}.search-results{padding:12px;max-height:390px;overflow:auto}.search-result{display:flex;align-items:center;gap:13px;padding:12px;border-radius:8px;font-size:14px}.search-result:hover{background:var(--blue-light)}.search-result svg{color:var(--blue)}.search-result small{font-size:11px;color:#8b96a8;display:block;margin-top:3px}.search-dialog-footer{display:flex;justify-content:space-between;padding:12px 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@media(min-width:1500px){.home-layout{grid-template-columns:minmax(0,1fr) 288px;gap:36px}.tool-card{padding:25px}.subject-card{min-height:190px;padding:24px}.subject-card h3{font-size:17px}.subject-card .subject-meta{font-size:12px}.subject-card p{font-size:12px}.tool-card p,.rail-card>p{font-size:14px}}
@media(max-width:1150px){:root{--sidebar:195px}.sidebar{padding-left:16px;padding-right:16px}.brand{font-size:23px}.topbar{padding:0 28px}.topbar-tag{display:none}main{padding:32px 28px}.home-layout{grid-template-columns:minmax(0,1fr) 225px;gap:20px}.subjects-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.quick-tools{grid-template-columns:1fr}.tool-card{min-height:150px}.tool-card h3{margin-top:8px}.tool-card-bottom{margin-top:13px}.site-footer{padding-left:28px;padding-right:28px}h1{font-size:36px}.heading-aside{display:none}.right-rail{padding-top:0}}
@media(max-width:850px){.home-layout{grid-template-columns:1fr}.right-rail{display:grid;grid-template-columns:1fr 1fr;gap:20px}.rail-links{margin-top:0;padding-top:12px}.quick-tools{grid-template-columns:1fr 1fr}.subjects-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.search-trigger{min-width:0}.search-trigger kbd{display:none}.search-trigger>span:nth-child(2){font-size:12px}.site-footer{flex-direction:column;gap:5px}.brand{font-size:22px}.nav-item{padding:12px;font-size:13px}.topbar{gap:15px}}
@media(max-width:650px){:root{--sidebar:0px}.sidebar{width:235px;transform:translateX(-100%);transition:transform .2s;padding:25px 20px}.sidebar.open{transform:translateX(0)}.sidebar.open~.mobile-overlay{display:block;position:fixed;inset:0;background:#15223a40;z-index:19}.mobile-menu{display:inline-grid!important}.topbar{height:66px;padding:0 18px;gap:12px}.breadcrumb{font-size:13px}.search-trigger{padding:8px;min-width:34px;border:0;background:none}.search-trigger>span:nth-child(2){display:none}main{padding:28px 20px 25px}.page-heading{margin-bottom:25px}.eyebrow{font-size:10px;margin-bottom:10px}h1{font-size:34px;letter-spacing:-1.5px}.page-heading p{font-size:14px;max-width:310px}.quick-tools{gap:11px;margin-bottom:26px}.tool-card{padding:18px 15px;min-height:200px}.tool-card h3{font-size:18px}.tool-card p{font-size:12px}.tool-card-bottom{align-items:flex-start;flex-direction:column;margin-top:auto;padding-top:17px;gap:8px}.tool-meta{font-size:10px}.button{padding:9px 13px;font-size:12px}.subjects-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.subject-card{padding:18px 15px;min-height:164px}.subject-card .level{font-size:9px;right:12px}.subject-card h3{font-size:15px}.right-rail{grid-template-columns:1fr;margin-top:7px}.rail-links{padding:0 7px}.rail-card h3{font-size:24px}.core-links{display:grid;grid-template-columns:1fr;gap:0}.core-link{padding:12px 0}.bottom-strip{padding:18px 15px;gap:12px;flex-wrap:wrap}.bottom-strip .text-button{margin-left:35px}.site-footer{padding:18px 20px;font-size:10px}.search-dialog{top:9vh}.toast{max-width:calc(100% - 30px);width:max-content}}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}main:focus{outline:none}.small-muted{color:#8a95a5;font-size:12px}.filter-chips{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 28px}.filter-chip{border:1px solid var(--line);background:white;padding:9px 14px;border-radius:7px;color:#778296;font-size:12px;transition:color .15s,background .15s}.filter-chip:hover{border-color:#c5d6fa;color:var(--blue)}.filter-chip.selected{background:var(--blue-light);color:var(--blue);border-color:#d8e4ff;font-weight:600}.full-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.full-grid .subject-card{min-height:195px;padding:25px}.full-grid .subject-card h3{font-size:18px}.full-grid .subject-card p{font-size:12px}.full-grid .subject-card .subject-meta{font-size:12px}.source-footnote{font-size:12px;color:#909bab;margin-top:25px;line-height:1.7}.source-footnote a{color:#6784b5;text-decoration:underline;text-underline-offset:3px}.back-link{display:inline-block;font-size:13px;color:#7c8ba3;margin-bottom:26px;border-bottom:1px solid #cad4e5;padding-bottom:3px}.back-link:hover{color:var(--blue)}.subject-heading{display:flex;gap:20px;align-items:center;margin-bottom:38px}.subject-heading .subject-icon{width:66px;height:66px;margin:0;border:1px solid #e0e9fc;border-radius:16px}.subject-heading .subject-icon svg{width:31px;height:31px}.subject-heading .eyebrow{margin-bottom:7px}.subject-workspace{display:grid;grid-template-columns:minmax(0,1fr) 275px;gap:32px}.notes-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.note-card{padding:20px 22px;background:white;border:1px solid var(--line);border-radius:13px;transition:border-color .15s}.note-card:hover{border-color:#c6d7fa}.note-card-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:25px}.note-subject{display:flex;align-items:center;gap:8px;font-size:12px;color:#7d8daa}.note-subject svg{width:15px;height:15px}.save-button{width:34px;height:34px}.save-button.is-saved{color:var(--blue);background:#eef4ff}.save-button.is-saved svg{fill:#2459e01a}.note-card-content{display:block}.topic-label{font-size:10px;color:#96a1b4;letter-spacing:.6px;text-transform:uppercase;display:block;margin-bottom:9px}.note-card h3{font-size:18px;line-height:1.4}.note-card p{font-size:14px;color:#8290a3;margin-top:10px;line-height:1.7;min-height:48px}.read-time{display:flex;align-items:center;gap:7px;font-size:11px;color:#9aa4b4;margin-top:27px}.read-time svg{width:13px;height:13px}.info-strip{display:flex;gap:12px;align-items:flex-start;margin-top:28px;color:#8b99ae}.info-strip svg{width:18px;height:18px;margin-top:3px}.info-strip p{font-size:12px;line-height:1.7}.subject-practice{background:#edf3ff;border:1px solid #dce7fd;border-radius:16px;padding:28px 25px;align-self:start;display:flex;flex-direction:column}.subject-practice>.tool-card-icon{margin-bottom:25px}.subject-practice>.eyebrow{font-size:10px;color:#7f99c5;margin-bottom:10px}.subject-practice h2{font-size:25px;letter-spacing:-.9px}.subject-practice p{font-size:14px;color:#6f84aa;margin-top:12px}.quiz-meta{display:flex;gap:15px;font-size:12px;color:#8196bb;margin:25px 0 17px}.subject-practice .small-muted{color:#8196bb;font-size:10px;margin-top:13px;text-align:center}.library-toolbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:26px;border-bottom:1px solid var(--line);padding-bottom:16px;gap:16px}.library-active{font-size:14px;font-weight:600}.library-active>span{color:#8c99ad;font-size:11px;margin-left:7px;background:#f0f4fa;border-radius:5px;padding:3px 6px}.select-label{display:flex;align-items:center;gap:10px;font-size:12px;color:#8793a5}.select-label select{background:white;color:#5e6c82;border:1px solid var(--line);border-radius:7px;font-size:12px;padding:9px 28px 9px 12px;max-width:180px}.library-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.empty-state{display:flex;flex-direction:column;align-items:center;text-align:center;gap:16px;background:white;border:1px dashed #dce3ee;border-radius:16px;padding:70px 25px;margin-top:25px}.empty-state .subject-icon{margin:0}.empty-state p{font-size:15px;color:#8995a6;max-width:420px}.empty-state .button{margin-top:5px}.reading-layout{display:grid;grid-template-columns:minmax(0,720px) minmax(150px,1fr);gap:70px}.reader-heading{display:flex;gap:20px;align-items:center;justify-content:space-between}.reader h1{font-size:38px;line-height:1.3}.reader-summary{font-size:17px;color:#8b97a9;margin-top:15px;line-height:1.7}.reader-meta{display:flex;align-items:center;gap:20px;color:#9da7b6;font-size:11px;border-bottom:1px solid var(--line);padding:22px 0 27px;margin-bottom:30px}.reader-meta>span{display:flex;align-items:center;gap:6px}.reader-meta svg{width:13px;height:13px}.reader-body section{margin-bottom:30px}.reader-body h2{font-size:21px;margin-bottom:12px}.reader-body p,.reader-body li{font-size:16px;line-height:1.9;color:#657187}.reader-body ul{padding-left:21px;margin:0}.reader-body li{padding-left:6px;margin-bottom:9px}.takeaway{background:#eef4ff;border:1px solid #e0e9fc;border-radius:12px;padding:22px 25px;margin:28px 0}.takeaway>span{display:block;font-size:10px;letter-spacing:1.4px;color:#6d8bc1;font-weight:600;margin-bottom:10px}.takeaway p{color:#526f9d;font-size:15px;line-height:1.8}.recall{padding-top:5px}.recall details{margin-top:15px;border:1px solid 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