.student-portal{--sp-ink:#15171c;--sp-ink-2:#3f434c;--sp-muted:#6b6e76;--sp-faint:#9a9ca3;--sp-paper:#f6f4ef;--sp-sheet:#fffdf9;--sp-tint:#efebe3;--sp-rule:#e4dfd5;--sp-rule-2:#d6d0c4;--sp-orange:#db5128;--sp-orange-ink:#a83e1d;--sp-orange-wash:#fbeee6;background:var(--sp-paper);color:var(--sp-ink);font-family:var(--font-sans),system-ui,sans-serif;min-height:100vh;line-height:1.5;display:flex;flex-direction:column;-webkit-font-smoothing:antialiased}.student-portal *{box-sizing:border-box}.student-portal a{color:inherit;text-decoration:none}.student-portal button,.student-portal input{font:inherit}.student-portal :focus-visible{outline:2px solid var(--sp-orange);outline-offset:3px;border-radius:4px}.student-main{flex:1}.student-container{width:min(1240px,calc(100% - 48px));margin:0 auto}.student-sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}.student-skip{position:absolute;top:-90px;left:16px;z-index:100;padding:10px 14px;background:var(--sp-ink);color:#fff!important;border-radius:6px}.student-skip:focus{top:10px}.student-eyebrow{font:500 11px/1.5 var(--font-mono),monospace;letter-spacing:.1em;text-transform:uppercase;color:var(--sp-orange-ink);margin:0}.student-header{background:var(--sp-paper);border-bottom:1px solid var(--sp-rule);position:relative;z-index:2}.student-header-inner{min-height:60px;gap:16px}.student-brand,.student-header-inner{display:flex;align-items:center}.student-header img{display:block;width:92px;height:auto}.student-header-label{border-left:1px solid var(--sp-rule-2);padding-left:16px;font:500 11px var(--font-mono),monospace;letter-spacing:.1em;text-transform:uppercase;color:var(--sp-muted)}.student-account{margin-left:auto;display:flex;gap:10px;align-items:center;font-size:12px;color:var(--sp-muted);min-width:0}.student-email{max-width:240px;text-overflow:ellipsis;overflow:hidden;white-space:nowrap}.student-signout{border:1px solid var(--sp-rule-2);border-radius:6px;padding:5px 12px;background:transparent;color:var(--sp-ink);cursor:pointer;font-size:12px}.student-signout:hover{background:var(--sp-tint)}.student-button{display:inline-flex;justify-content:center;align-items:center;gap:8px;min-height:40px;border-radius:7px;font-size:13px;font-weight:600;border:0;cursor:pointer;padding:9px 14px;transition:background .15s,border-color .15s;white-space:nowrap}.student-button-primary{background:var(--sp-orange);color:#fff!important}.student-button-primary:hover{background:#b7431f}.student-button-primary:disabled{opacity:.65;cursor:wait}.student-button-secondary{color:var(--sp-ink);border:1px solid var(--sp-rule-2);background:var(--sp-sheet)}.student-button-secondary:hover{background:var(--sp-tint);border-color:#c7c0b2}.student-access-form{margin-top:26px}.student-access-form label{display:block;font-size:13px;font-weight:600;margin-bottom:8px}.student-access-form input{width:100%;height:48px;border:1px solid var(--sp-rule-2);border-radius:7px;padding:0 14px;color:var(--sp-ink);background:#fff}.student-access-form input:focus{border-color:var(--sp-ink)}.student-access-form .student-button{width:100%;justify-content:space-between;margin-top:12px;min-height:48px}.student-form-note{color:var(--sp-muted);font-size:12px;line-height:1.6;margin:12px 0 0}.student-error{background:#fff3ee;padding:11px 12px;color:#9a3819!important;border:1px solid #efd8c7;border-radius:7px;margin-top:16px!important;font-size:13px!important}.student-sent{margin-top:24px;background:#f3f6f1;border:1px solid #d9e3d6;border-radius:9px;padding:20px;color:#2f5443}.student-sent h3{font-size:17px;margin:8px 0}.student-sent p{font-size:14px;line-height:1.65}.student-text-button{border:0;background:none;text-decoration:underline;color:inherit;padding:0;cursor:pointer;font-size:13px!important}.student-spin{animation:student-spin 1s linear infinite}@keyframes student-spin{to{transform:rotate(1turn)}}.student-login{padding:72px 0 96px;display:grid;grid-template-columns:1.15fr minmax(320px,440px);gap:72px;align-items:center}.student-login h1{font-size:50px;line-height:1.06;letter-spacing:-.035em;margin:18px 0 20px;font-weight:600}.student-login h1 span{color:var(--sp-ink-2);font-weight:500}.student-lead{max-width:470px;color:var(--sp-muted);font-size:17px;line-height:1.7;margin:0}.student-login-features{list-style:none;padding:0;margin:36px 0 0;display:grid;gap:0;max-width:470px;border-top:1px solid var(--sp-rule)}.student-login-features li{display:flex;align-items:flex-start;gap:14px;padding:14px 0;border-bottom:1px solid var(--sp-rule)}.student-login-features svg{color:var(--sp-orange);flex-shrink:0;margin-top:2px}.student-login-features small,.student-login-features strong{display:block}.student-login-features strong{font-size:14px;font-weight:600}.student-login-features small{font-size:13px;color:var(--sp-muted);margin-top:2px}.student-login-card{background:var(--sp-sheet);border:1px solid var(--sp-rule);border-radius:12px;padding:34px;box-shadow:inset 0 1px 0 #fff,0 18px 40px -28px #3b2f1f40}.student-login-card h2{font-size:22px;letter-spacing:-.02em;font-weight:600;margin:0 0 8px}.student-login-card>p{font-size:14px;color:var(--sp-muted);margin:0;line-height:1.65}.student-login-help{font-size:12px;color:var(--sp-muted);line-height:1.7;margin-top:26px;padding-top:18px;border-top:1px solid var(--sp-rule)}.student-login-help p{margin:0 0 8px}.student-login-help a{color:var(--sp-orange-ink);text-decoration:underline;text-underline-offset:3px}.student-empty{padding:80px 0 110px;min-height:60vh}.student-empty h1{font-size:38px;line-height:1.15;letter-spacing:-.03em;font-weight:600;margin:18px 0}.student-empty>p{max-width:620px;font-size:15px;color:var(--sp-muted);line-height:1.8}.student-empty>a{margin:18px 0}.student-footer{border-top:1px solid var(--sp-rule);color:var(--sp-muted);font-size:12px}.student-footer-inner{padding:18px 0;display:flex;align-items:center;justify-content:space-between;gap:16px}.student-footer a{display:inline-flex;gap:7px;align-items:center}.student-footer a:hover{color:var(--sp-ink)}.notebook{padding-bottom:56px}.notebook-coursebar{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;padding:20px 0 0;border-bottom:1px solid var(--sp-rule)}.notebook-course-title{padding-bottom:14px;min-width:0}.notebook-course-name{margin:0;font-size:18px;font-weight:600;letter-spacing:-.015em}.notebook-course-dates{margin:2px 0 0;font-size:12px;color:var(--sp-muted)}.notebook-levels ul{list-style:none;margin:0;padding:0;display:flex;gap:4px}.notebook-level{display:flex;align-items:center;gap:10px;padding:10px 16px 12px;border:1px solid transparent;border-bottom:0;border-radius:9px 9px 0 0;margin-bottom:-1px;color:var(--sp-muted);min-width:170px}.notebook-level strong{display:block;font-size:14px;font-weight:600;color:var(--sp-ink-2)}.notebook-level small{display:block;font-size:11px;line-height:1.35;color:var(--sp-muted);white-space:nowrap}.notebook-level-dot{width:8px;height:8px;border-radius:50%;border:1.5px solid var(--sp-faint);flex-shrink:0}a.notebook-level:hover{background:var(--sp-tint)}.notebook-level.is-active{background:var(--sp-sheet);border-color:var(--sp-rule);color:var(--sp-ink)}.notebook-level.is-active strong{color:var(--sp-ink)}.notebook-level.is-active .notebook-level-dot{background:var(--sp-orange);border-color:var(--sp-orange)}.notebook-level.is-locked{cursor:not-allowed;opacity:.75}.notebook-level.is-locked svg{color:var(--sp-faint);flex-shrink:0}.notebook-layout{display:grid;grid-template-columns:288px minmax(0,1fr);gap:36px;align-items:start;padding-top:28px}.notebook-sidebar{position:sticky;top:16px;max-height:calc(100vh - 32px);overflow-y:auto;padding:0 4px 24px 0;scrollbar-width:thin}.notebook-sidebar-head{padding-bottom:16px;margin-bottom:6px;border-bottom:1px solid var(--sp-rule)}.notebook-sidebar-head>p:not(.student-eyebrow){font-size:13px;line-height:1.6;color:var(--sp-muted);margin:8px 0 0}.notebook-editions ul{list-style:none;margin:12px 0 0;padding:0;display:flex;flex-wrap:wrap;gap:6px}.notebook-editions a{display:block;font-size:12px;padding:4px 9px;border:1px solid var(--sp-rule-2);border-radius:999px;color:var(--sp-muted)}.notebook-editions a[aria-current]{border-color:var(--sp-ink);color:var(--sp-ink)}.notebook-outline ol,.notebook-outline ul{list-style:none;margin:0;padding:0}.notebook-outline-group{padding:16px 0 12px;border-bottom:1px solid var(--sp-rule)}.notebook-outline-group:last-child{border-bottom:0}.notebook-outline-heading{font:500 11px/1.4 var(--font-mono),monospace;letter-spacing:.1em;text-transform:uppercase;color:var(--sp-muted);margin:0 0 8px}.notebook-outline-hint{font-size:12px;line-height:1.55;color:var(--sp-muted);margin:-2px 0 8px}.notebook-lesson+.notebook-lesson{margin-top:14px}.notebook-lesson-label{display:flex;gap:10px;align-items:flex-start;margin:0 0 4px}.notebook-lesson-number{font:500 11px var(--font-mono),monospace;color:var(--sp-orange-ink);padding-top:3px;min-width:18px}.notebook-lesson-label strong{display:block;font-size:14px;line-height:1.35;font-weight:600}.notebook-lesson-label small{display:block;font-size:11px;color:var(--sp-muted);margin-top:1px}.notebook-lesson ul{margin-left:28px!important}.notebook-item{position:relative;display:flex;align-items:stretch;border-radius:7px}.notebook-item-link{flex:1;min-width:0;display:flex;gap:10px;align-items:flex-start;padding:6px 8px;border-radius:7px;color:var(--sp-ink-2)}.notebook-item:hover .notebook-item-link{background:var(--sp-tint);color:var(--sp-ink)}.notebook-item-icon{display:grid;place-items:center;width:18px;height:20px;color:var(--sp-faint);flex-shrink:0}.notebook-item-text{min-width:0;flex:1;display:flex;align-items:flex-start;justify-content:space-between;gap:8px}.notebook-item-title{display:block;font-size:13px;line-height:1.4}.notebook-item-meta{display:flex;gap:5px;align-items:center;flex-shrink:0;padding-top:1px;font-size:11px;color:var(--sp-muted);white-space:nowrap}.notebook-item.is-current .notebook-item-link{background:var(--sp-sheet);color:var(--sp-ink);box-shadow:inset 2px 0 0 var(--sp-orange),0 0 0 1px var(--sp-rule)}.notebook-item.is-current .notebook-item-title{font-weight:600}.notebook-item.is-current .notebook-item-icon{color:var(--sp-orange)}.notebook-item-download{display:grid;place-items:center;width:32px;flex-shrink:0;border-radius:7px;color:var(--sp-faint)}.notebook-item-download:hover{color:var(--sp-ink);background:var(--sp-tint)}.notebook-format{font:500 10px var(--font-mono),monospace;letter-spacing:.04em;color:var(--sp-muted);border:1px solid var(--sp-rule-2);border-radius:4px;padding:1px 5px;line-height:1.5}.notebook-tag{font-size:10px;font-weight:600;color:var(--sp-orange-ink);background:var(--sp-orange-wash);border-radius:4px;padding:1px 6px}.notebook-drawer{display:none}.notebook-main,.notebook-workspace{min-width:0}.notebook-toolbar{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;padding:0 0 18px}.notebook-toolbar-text{min-width:0;max-width:720px}.notebook-toolbar h1{font-size:30px;line-height:1.15;letter-spacing:-.025em;font-weight:600;margin:6px 0 0;overflow-wrap:anywhere}.notebook-toolbar-description{font-size:14px;line-height:1.6;color:var(--sp-muted);margin:8px 0 0}.notebook-actions{display:flex;gap:8px;flex-shrink:0}.notebook-actions .notebook-format{margin-left:2px}.notebook-notes{display:grid;gap:8px;margin-bottom:14px}.notebook-note{margin:0;font-size:13px;line-height:1.6;color:var(--sp-ink-2);background:var(--sp-tint);border-radius:8px;padding:10px 14px}.notebook-note.is-review{background:var(--sp-orange-wash);color:#6f2c15}.notebook-sheet{background:var(--sp-sheet);border:1px solid var(--sp-rule);border-radius:12px;box-shadow:inset 0 1px 0 #fff,0 24px 48px -36px #3b2f1f4d;min-height:280px;overflow:hidden}.notebook-sheet .notebook-resource-heading{display:none}.notebook-reader{padding:44px 56px 56px}.notebook-reader-note{font-size:13px;line-height:1.6;color:var(--sp-muted);margin:0 0 16px}.notebook-reader-note a{color:var(--sp-orange-ink);text-decoration:underline;text-underline-offset:3px}.notebook-reader-fallback{display:grid;place-items:center;min-height:240px;text-align:center}.notebook-markdown{max-width:70ch;margin:0 auto;font-size:16.5px;line-height:1.75;color:var(--sp-ink-2);overflow-wrap:break-word}.notebook-markdown>:first-child{margin-top:0}.notebook-markdown h1,.notebook-markdown h2{font-size:24px;line-height:1.25;letter-spacing:-.02em;color:var(--sp-ink);font-weight:600;margin:2.2em 0 .6em}.notebook-markdown h3{font-size:19px;line-height:1.3;color:var(--sp-ink);font-weight:600;margin:1.9em 0 .5em}.notebook-markdown h4,.notebook-markdown h5,.notebook-markdown h6{font-size:16px;color:var(--sp-ink);font-weight:600;margin:1.6em 0 .4em}.notebook-markdown p{margin:0 0 1.05em}.notebook-markdown ol,.notebook-markdown ul{margin:0 0 1.1em;padding-left:1.4em}.notebook-markdown li{margin:.3em 0}.notebook-markdown li::marker{color:var(--sp-faint)}.notebook-markdown strong{color:var(--sp-ink);font-weight:600}.notebook-markdown a{color:var(--sp-orange-ink);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}.notebook-markdown blockquote{margin:1.4em 0;padding:2px 0 2px 18px;border-left:2px solid var(--sp-orange);color:var(--sp-ink)}.notebook-markdown hr{border:0;border-top:1px solid var(--sp-rule);margin:2.4em 0}.notebook-markdown code{font-family:var(--font-mono),monospace;font-size:.86em;background:var(--sp-tint);border-radius:4px;padding:.12em .35em;color:var(--sp-ink)}.notebook-markdown pre{background:#f3efe7;border:1px solid var(--sp-rule);border-radius:8px;padding:14px 16px;overflow-x:auto;font-size:13.5px;line-height:1.65;margin:0 0 1.3em}.notebook-markdown pre code{background:none;padding:0;font-size:inherit}pre.notebook-markdown{white-space:pre-wrap;font-family:var(--font-mono),monospace;font-size:14px;background:none;border:0;padding:0}.notebook-markdown input[type=checkbox]{accent-color:var(--sp-orange);margin-right:6px}.notebook-table-wrap{overflow-x:auto;margin:0 0 1.4em;border:1px solid var(--sp-rule);border-radius:8px;background:#fff;max-width:100%}.notebook-table-wrap table{border-collapse:collapse;width:100%;font-size:13.5px;line-height:1.5}.notebook-table-wrap td,.notebook-table-wrap th{padding:8px 12px;border-bottom:1px solid var(--sp-rule);text-align:left;vertical-align:top}.notebook-table-wrap th{background:#f7f4ee;font-weight:600;color:var(--sp-ink);white-space:nowrap}.notebook-table-wrap tr:last-child td{border-bottom:0}.notebook-sheets{max-width:none}.notebook-sheets section+section{margin-top:28px}.notebook-sheets h3{font-size:15px;font-weight:600;margin:0 0 10px}.notebook-sheets td{white-space:nowrap;font-variant-numeric:tabular-nums}.notebook-sheets tr:first-child td{font-weight:600;background:#f7f4ee}.notebook-reader:has(.notebook-pdf){padding:0}.notebook-pdf{background:#ebe7df}.notebook-pdf embed,.notebook-pdf iframe,.notebook-pdf object{display:block;width:100%;height:min(82vh,1100px);border:0;background:#ebe7df}.notebook-pdf .notebook-reader-note{margin:0;padding:10px 16px;background:var(--sp-sheet);border-top:1px solid var(--sp-rule)}.notebook-recording{display:flex;gap:16px;align-items:flex-start;padding:40px 56px}.notebook-recording-icon{width:44px;height:44px;border-radius:50%;display:grid;place-items:center;background:var(--sp-orange);color:#fff;flex-shrink:0}.notebook-recording.is-pending .notebook-recording-icon{background:var(--sp-tint);color:var(--sp-faint)}.notebook-recording strong{display:block;font-size:17px;font-weight:600}.notebook-recording p{font-size:14px;line-height:1.65;color:var(--sp-muted);margin:6px 0 16px;max-width:520px}.notebook-passcode{margin-top:16px!important}.notebook-passcode code{font-family:var(--font-mono),monospace;background:var(--sp-tint);color:var(--sp-ink);padding:2px 6px;border-radius:4px;user-select:all}.notebook-pager{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:18px}.notebook-pager-link{display:flex;align-items:center;gap:10px;padding:12px 14px;border:1px solid var(--sp-rule);border-radius:9px;color:var(--sp-ink-2);min-width:0}.notebook-pager-link:hover{background:var(--sp-sheet);border-color:var(--sp-rule-2);color:var(--sp-ink)}.notebook-pager-link span{min-width:0}.notebook-pager-link small{display:block;font-size:11px;color:var(--sp-muted)}.notebook-pager-link strong{display:block;font-size:13px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.notebook-pager-link.is-next{justify-content:flex-end;text-align:right;grid-column:2}.notebook-pager-link svg{flex-shrink:0;color:var(--sp-faint)}.notebook-practice-note{display:flex;gap:10px;align-items:flex-start;margin-top:28px;color:var(--sp-muted)}.notebook-practice-note svg{flex-shrink:0;margin-top:3px}.notebook-practice-note p{font-size:12px;line-height:1.7;margin:0;max-width:760px}.notebook-practice-note strong{color:var(--sp-ink-2);font-weight:600}@media(max-width:1080px){.notebook-layout{grid-template-columns:248px minmax(0,1fr);gap:26px}.notebook-reader{padding:36px 36px 44px}.notebook-recording{padding:32px 36px}.notebook-toolbar{flex-direction:column;align-items:flex-start;gap:14px}}@media(max-width:860px){.notebook-course-dates{display:none}.student-login{grid-template-columns:1fr;gap:36px;padding:44px 0 64px}.student-login h1{font-size:40px}.notebook-coursebar{flex-direction:column;align-items:stretch;gap:12px;padding-top:16px}.notebook-course-title{padding-bottom:0}.notebook-levels ul{gap:4px}.notebook-levels li{flex:1;min-width:0}.notebook-level{min-width:0;padding:9px 12px 11px}.notebook-level small{white-space:normal}.notebook-layout{grid-template-columns:1fr;padding-top:16px;gap:0}.notebook-sidebar{display:none}.notebook-drawer{display:block;margin-bottom:18px;background:var(--sp-sheet);border:1px solid var(--sp-rule);border-radius:10px}.notebook-drawer summary{display:flex;align-items:center;gap:10px;padding:11px 14px;cursor:pointer;list-style:none;min-height:52px}.notebook-drawer summary::-webkit-details-marker{display:none}.notebook-drawer summary>span{flex:1;min-width:0}.notebook-drawer summary small{display:block;font-size:11px;color:var(--sp-muted)}.notebook-drawer summary strong{display:block;font-size:14px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.notebook-drawer summary>svg{color:var(--sp-muted);flex-shrink:0}.notebook-drawer[open] .notebook-drawer-chevron{transform:rotate(180deg)}.notebook-drawer .notebook-outline{padding:0 10px 6px;border-top:1px solid var(--sp-rule)}.notebook-item-link{padding:10px 8px}.notebook-item-download{width:44px}}@media(max-width:560px){.student-container{width:calc(100% - 32px)}.student-header-inner{min-height:54px;gap:10px}.student-header img{width:80px}.student-header-label{padding-left:10px;font-size:10px;letter-spacing:.06em}.student-account{font-size:11px;gap:6px}.student-email{max-width:118px}.student-login h1{font-size:34px}.student-lead{font-size:15px}.student-login-card{padding:24px 20px}.student-empty{padding:48px 0 72px}.student-empty h1{font-size:30px}.student-footer-inner{flex-direction:column;align-items:flex-start;gap:8px}.notebook-course-name{font-size:16px}.notebook-level{gap:8px;padding:8px 10px 10px}.notebook-level strong{font-size:13px}.notebook-level small{font-size:10.5px}.notebook-toolbar h1{font-size:24px}.notebook-toolbar-description{font-size:13px}.notebook-actions{width:100%}.notebook-actions .student-button{flex:1;min-height:44px}.notebook-coursebar{gap:6px;padding-top:10px}.notebook-course-title{padding-bottom:0}.notebook-levels ul{gap:3px}.notebook-level{padding:6px 8px 8px}.notebook-level small{line-height:1.25}.notebook-layout{padding-top:10px}.notebook-toolbar{gap:10px;padding-bottom:12px}.notebook-toolbar h1{margin-top:4px;line-height:1.1}.notebook-toolbar-description{margin-top:4px;line-height:1.45}.notebook-actions{gap:6px}.notebook-drawer{margin-bottom:12px}.notebook-drawer summary{min-height:48px;padding:8px 12px}.notebook-sheet{border-radius:10px;margin:0 -6px}.notebook-reader{padding:24px 18px 32px}.notebook-markdown{font-size:16px;line-height:1.7}.notebook-markdown h1,.notebook-markdown h2{font-size:21px}.notebook-recording{padding:24px 18px;flex-direction:column}.notebook-pdf embed,.notebook-pdf iframe,.notebook-pdf object{height:70vh}.notebook-pager{grid-template-columns:1fr}.notebook-pager-link.is-next{grid-column:auto}.notebook-pager>span:empty{display:none}}@media(prefers-reduced-motion:reduce){.student-spin{animation:none}.student-button{transition:none}}.notebook-toc{border:1px solid var(--sp-rule,#e5ded4);border-radius:7px;padding:0 18px;margin:0 0 28px;background:#faf8f4}.notebook-toc summary{cursor:pointer;font-size:14px;font-weight:600;padding:15px 0}.notebook-toc summary span{font-weight:400;color:#757879;font-size:12px;margin-left:10px}.notebook-toc nav{max-height:310px;overflow:auto;padding-bottom:16px}.notebook-toc ol{list-style:none!important;display:grid;grid-template-columns:1fr 1fr;gap:9px 20px;padding:0!important;margin:0!important}.notebook-toc li{font-size:13px;line-height:1.5;margin:0!important}.notebook-toc a{color:#54585d!important;text-decoration:none!important}.notebook-toc a:hover{color:#db5128!important}.notebook-markdown h2{scroll-margin-top:24px}@media(max-width:700px){.notebook-toc ol{grid-template-columns:1fr}}.notebook-frontmatter{border-bottom:1px solid var(--sp-rule);margin-bottom:24px;font-size:13px}.notebook-frontmatter summary{cursor:pointer;color:var(--sp-muted);padding-bottom:12px}.notebook-frontmatter pre{white-space:pre-wrap;overflow-wrap:anywhere;font-size:12px}