@font-face{font-family:Inter;src:url(/fonts/inter-400.woff2)format("woff2");font-weight:400;font-display:swap}@font-face{font-family:Inter;src:url(/fonts/inter-500.woff2)format("woff2");font-weight:500;font-display:swap}@font-face{font-family:Inter;src:url(/fonts/inter-600.woff2)format("woff2");font-weight:600;font-display:swap}@font-face{font-family:Inter;src:url(/fonts/inter-700.woff2)format("woff2");font-weight:700;font-display:swap}:root{color-scheme:light;--background:#fff;--foreground:#171717;--card:#fff;--primary:#171717;--primary-foreground:#fafafa;--secondary:#f5f5f5;--muted:#f5f5f5;--muted-foreground:#6b6b6b;--accent:#ededed;--border:#e5e5e5;--ring:#737373;--sidebar:#fafafa;--destructive:#b91c1c;--radius:10px;--shadow:0 1px 2px #0000000a;--ease:cubic-bezier(.23, 1, .32, 1)}*{box-sizing:border-box}body{background:var(--sidebar);color:var(--foreground);-webkit-font-smoothing:antialiased;margin:0;font:1rem/1.6 Inter,system-ui,sans-serif}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{color:inherit;cursor:pointer;transition:background-color .15s ease, transform .15s var(--ease);background:0 0;border:0}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--ring);outline-offset:3px}button:disabled{cursor:default;opacity:.5}button:active:not(:disabled),.button:active{transform:scale(.98)}h1,h2,h3,p{margin:0}img{max-width:100%;display:block}svg{flex-shrink:0}::selection{color:#171717;background:#dedede}[hidden]{display:none!important}.sr-only{clip:rect(0,0,0,0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.skip-link{z-index:100;background:var(--primary);color:#fff;padding:12px 20px;position:fixed;top:8px;left:16px;transform:translateY(-160%)}.skip-link:focus{transform:translateY(0)}.sidebar{z-index:20;background:var(--sidebar);flex-direction:column;width:280px;padding:24px 16px 16px;display:flex;position:fixed;inset:0 auto 0 0;overflow-y:auto}.brand{letter-spacing:-.3px;align-items:center;gap:10px;margin:0 8px 32px;font-size:1.125rem;font-weight:600;line-height:1.15;display:flex}.brand-mark{background:var(--primary);color:#fff;border-radius:8px;place-items:center;width:34px;height:34px;display:grid}.brand-mark svg{width:19px;height:19px}.brand-sub{color:var(--muted-foreground);letter-spacing:0;margin-top:4px;font-size:.875rem;font-weight:400;display:block}.sidebar-label{color:var(--muted-foreground);margin-bottom:8px;padding:0 9px;font-size:.875rem;font-weight:500}.primary-nav,.chapter-nav{gap:3px;display:grid}.nav-link{border-radius:6px;align-items:center;gap:10px;min-height:44px;padding:9px 10px;font-size:1rem;display:flex}.nav-link svg{width:16px;height:16px}.nav-link.active{background:var(--accent);font-weight:500}.nav-count{color:var(--muted-foreground);font-variant-numeric:tabular-nums;margin-left:auto;font-size:.875rem}.chapters-label{justify-content:space-between;align-items:center;margin-top:28px;display:flex}.chapters-label>span{font-variant-numeric:tabular-nums;font-size:.875rem}.chapter-nav-link{text-align:left;min-height:42px;color:var(--muted-foreground);border-radius:6px;align-items:center;gap:11px;padding:8px 10px;font-size:1rem;display:flex}.chapter-nav-link.selected{background:var(--secondary);color:var(--foreground);font-weight:500}.chapter-nav-number{font-variant-numeric:tabular-nums;font-size:.875rem}.chapter-mini-dot{border-radius:50%;width:5px;height:5px;margin-left:auto}.chapter-nav-link.selected .chapter-mini-dot,.chapter-mini-dot.completed{background:var(--foreground)}.sidebar-bottom{margin-top:auto;padding:30px 8px 0}.progress-label{justify-content:space-between;font-size:.875rem;display:flex}.progress-label strong{font-variant-numeric:tabular-nums;font-weight:500}progress{appearance:none;background:var(--border);border:0;border-radius:8px;width:100%;height:4px;margin:11px 0 4px;overflow:hidden}progress::-webkit-progress-bar{background:var(--border)}progress::-webkit-progress-value{background:var(--primary);border-radius:8px}progress::-moz-progress-bar{background:var(--primary)}#progress-caption{color:var(--muted-foreground);font-size:.875rem}.quiet-button{align-items:center;gap:9px;padding:16px 0;font-size:.875rem;display:flex}.back-home{border-top:1px solid var(--border);align-items:center;gap:9px;padding-top:16px;font-size:1rem;display:flex}.back-home>svg{color:var(--muted-foreground);margin-left:auto}.avatar{background:var(--secondary);border:1px solid var(--border);border-radius:7px;place-items:center;width:29px;height:29px;font-weight:600;display:grid}.workspace{background:var(--background);border:1px solid var(--border);min-height:calc(100dvh - 16px);box-shadow:var(--shadow);border-radius:12px;margin:8px 8px 8px 280px;overflow:clip}.topbar{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;height:64px;padding:0 28px;display:flex}.breadcrumb{color:var(--muted-foreground);align-items:center;gap:14px;font-size:1rem;display:flex}.breadcrumb strong{color:var(--foreground);font-weight:500}.crumb-slash{color:#a3a3a3}.topbar-right{align-items:center;gap:13px;display:flex}.academic-label{border:1px solid var(--border);border-radius:6px;align-items:center;gap:6px;padding:4px 8px;font-size:.875rem;display:flex}.academic-label>span{background:var(--foreground);border-radius:50%;width:5px;height:5px}.icon-button{width:32px;height:32px;color:var(--muted-foreground);border-radius:6px;flex-shrink:0;justify-content:center;align-items:center;display:inline-flex}.mobile-menu,.mobile-close{display:none}main{max-width:1720px;margin:auto;padding:30px 28px 0}main:focus{outline:none}.page-heading{justify-content:space-between;align-items:center;gap:24px;margin-bottom:26px;display:flex}h1{letter-spacing:-.8px;font-size:2rem;font-weight:600;line-height:1.25}.page-description{color:var(--muted-foreground);margin-top:8px;font-size:1rem;line-height:1.6}.eyebrow{letter-spacing:.55px;color:var(--muted-foreground);font-size:.875rem;font-weight:500;line-height:1.6}.overview-stats{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-bottom:28px;display:grid}.summary-card{border:1px solid var(--border);border-radius:var(--radius);background:var(--card);box-shadow:var(--shadow);padding:18px 20px}.summary-card>div{color:var(--muted-foreground);justify-content:space-between;align-items:center;gap:12px;font-size:1rem;display:flex}.summary-card>strong{letter-spacing:-.8px;font-variant-numeric:tabular-nums;margin:10px 0 8px;font-size:2.125rem;font-weight:600;line-height:1.2;display:block}.stat-denominator{color:var(--muted-foreground);font-size:1.25rem;font-weight:400}.summary-card>p{color:var(--muted-foreground);justify-content:space-between;align-items:center;gap:10px;font-size:.875rem;display:flex}.button{min-height:42px;box-shadow:var(--shadow);transition:background-color .15s ease, transform .15s var(--ease);border-radius:6px;justify-content:center;align-items:center;gap:8px;padding:8px 13px;font-size:1rem;font-weight:500;line-height:1.5;display:inline-flex}.button-dark{background:var(--primary);color:var(--primary-foreground);border:1px solid var(--primary)}.button-outline{border:1px solid var(--border);background:var(--background)}.text-button{align-items:center;gap:7px;padding:4px 0;font-size:.875rem;line-height:1.5;display:inline-flex}.path-layout{grid-template-columns:minmax(0,1fr) 320px;gap:24px;display:grid}.section-label{justify-content:space-between;align-items:center;gap:12px;margin-bottom:12px;font-size:1rem;font-weight:500;display:flex}.section-label>span:first-child{align-items:center;gap:8px;display:flex}.section-label>span:last-child{color:var(--muted-foreground);font-size:.875rem;font-weight:400}.next-lesson{border:1px solid var(--border);border-radius:var(--radius);background:var(--card);min-height:224px;box-shadow:var(--shadow);grid-template-columns:42% minmax(0,1fr);gap:22px;padding:16px;display:grid}.next-image{background:var(--muted);border-radius:7px;padding:0;position:relative;overflow:hidden}.next-image>img{object-fit:cover;width:100%;height:100%}.large-play{color:#171717;background:#fff;border-radius:50%;place-items:center;width:46px;height:46px;display:grid;box-shadow:0 2px 12px #0002}.large-play svg{margin-left:3px}.next-image>.large-play{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.duration{color:#fff;font-variant-numeric:tabular-nums;z-index:1;background:#171717e8;border-radius:4px;padding:2px 5px;font-size:.875rem;position:absolute;bottom:8px;right:8px}.next-copy{flex-direction:column;align-items:flex-start;padding:6px 3px 6px 0;display:flex}.pill{border:1px solid var(--border);color:var(--muted-foreground);letter-spacing:.25px;border-radius:5px;padding:3px 7px;font-size:.875rem;font-weight:500;display:inline-block}.next-copy h2{letter-spacing:-.65px;margin:13px 0 9px;font-size:1.625rem;font-weight:600;line-height:1.3}.next-copy p{color:var(--muted-foreground);margin-bottom:19px;font-size:1rem;line-height:1.7}.next-copy .button{margin-top:auto}.study-rhythm{color:var(--muted-foreground);align-items:center;gap:8px;padding:14px 0;font-size:.875rem;display:flex}.study-rhythm>span{white-space:nowrap;margin-left:auto;font-size:.875rem}.chapter-section{margin-top:12px;scroll-margin-top:20px}.chapter-panel{border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}.chapter-header{align-items:center;gap:12px;display:flex}.chapter-icon{background:var(--secondary);border:1px solid var(--border);border-radius:7px;flex-shrink:0;place-items:center;width:40px;height:40px;display:grid}.chapter-icon svg{width:21px;height:21px}.chapter-header .eyebrow{font-size:.875rem}.chapter-header .eyebrow>span{letter-spacing:0;margin-left:3px}.chapter-header h2{letter-spacing:-.4px;margin-top:2px;font-size:1.375rem;font-weight:600}.chapter-completion{font-variant-numeric:tabular-nums;background:var(--secondary);border:1px solid var(--border);border-radius:5px;margin-left:auto;padding:2px 7px;font-size:.875rem}.chapter-description{color:var(--muted-foreground);margin:15px 0 11px;font-size:1rem;line-height:1.7}.chapter-meta{color:var(--muted-foreground);flex-wrap:wrap;gap:13px;font-size:.875rem;display:flex}.chapter-meta>span{align-items:center;gap:5px;display:flex}.lesson-list{border-top:1px solid var(--border);margin-top:20px}.video-card{min-width:0}.lesson-row{border-bottom:1px solid var(--border);align-items:center;gap:13px;padding:18px 0;display:flex}.lesson-number{font-variant-numeric:tabular-nums;color:var(--muted-foreground);min-width:15px;font-size:.875rem}.thumbnail-button{aspect-ratio:16/9;background:var(--muted);border-radius:7px;width:100%;padding:0;display:block;position:relative;overflow:hidden}.thumbnail-button img{object-fit:cover;width:100%;height:100%}.thumbnail-play{color:#fff;opacity:0;background:#0003;justify-content:center;align-items:center;transition:opacity .15s;display:flex;position:absolute;inset:0}.thumbnail-play svg{box-sizing:content-box;background:#171717dd;border-radius:50%;padding:9px}.lesson-row .thumbnail-button{flex-shrink:0;width:144px}.lesson-row .duration{padding:1px 4px;font-size:.875rem;bottom:5px;right:5px}.video-copy{flex:1;min-width:0}.video-meta{color:var(--muted-foreground);align-items:center;gap:5px;margin-bottom:5px;font-size:.875rem;display:flex}.skill-dot{background:var(--muted-foreground);border-radius:50%;flex-shrink:0;width:5px;height:5px}.video-title{text-align:left;letter-spacing:-.15px;padding:0;font-size:1rem;font-weight:500;line-height:1.5;display:block}.video-copy>p{color:var(--muted-foreground);margin-top:5px;font-size:.875rem;line-height:1.6}.video-bottom{color:var(--muted-foreground);justify-content:space-between;align-items:center;margin-top:5px;font-size:.875rem;display:flex}.save-button{width:28px;height:28px}.save-button[aria-pressed=true]{color:var(--foreground);background:var(--accent)}.save-button[aria-pressed=true] svg{fill:var(--foreground)}.lesson-open{width:28px}.done-badge{color:#171717;box-shadow:var(--shadow);background:#fff;border-radius:4px;align-items:center;gap:3px;padding:2px 5px;font-size:.875rem;display:flex;position:absolute;top:6px;left:6px}.lesson-row.is-complete .lesson-number{font-size:0}.lesson-row.is-complete .lesson-number:before{content:"✓";color:var(--foreground);font-size:1rem}.checkpoint{background:var(--muted);border:1px solid var(--border);border-radius:7px;gap:11px;margin-top:18px;padding:15px;display:flex}.checkpoint-icon{width:22px;height:22px;color:var(--foreground);flex-shrink:0;place-items:center;display:grid}.checkpoint strong{font-size:.875rem;font-weight:500}.checkpoint p{color:var(--muted-foreground);margin-top:4px;font-size:.875rem;line-height:1.7}.checkpoint a{margin-top:9px;font-size:.875rem;text-decoration:underline;display:inline-block}.chapter-footer{justify-content:space-between;align-items:center;gap:13px;margin-top:18px;display:flex}.chapter-footer .button{white-space:nowrap;font-size:.875rem}.path-rail{padding-top:31px}.route-card{border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px 16px 13px}.rail-heading{justify-content:space-between;align-items:center;gap:10px;display:flex}.rail-heading h2{font-size:1rem;font-weight:600}.rail-heading>span{color:var(--muted-foreground);font-size:.875rem}.route-card>p{color:var(--muted-foreground);margin-top:6px;font-size:.875rem}.route-list{margin:16px 0 0;padding:0;list-style:none}.route-list>li{position:relative}.route-list>li:not(:last-child):before{content:"";background:var(--border);width:1px;height:calc(100% - 26px);position:absolute;top:38px;left:14px}.route-step{text-align:left;align-items:center;gap:9px;width:100%;min-height:78px;padding:12px 0;display:flex}.route-number{border:1px solid var(--border);background:var(--background);width:29px;height:29px;color:var(--muted-foreground);border-radius:50%;flex-shrink:0;place-items:center;font-size:.875rem;display:grid}.route-step.current .route-number,.route-step.completed .route-number{background:var(--primary);border-color:var(--primary);color:#fff}.route-step strong{font-size:.875rem;font-weight:500;display:block}.route-step small{color:var(--muted-foreground);margin-top:4px;font-size:.875rem;display:block}.route-step>svg{opacity:0;color:var(--muted-foreground);margin-left:auto}.route-step.current>svg{opacity:1}.personal-note{border:1px solid var(--border);background:var(--sidebar);border-radius:var(--radius);margin-top:18px;padding:19px}.personal-note>svg{color:var(--muted-foreground);margin-bottom:10px}.personal-note h3{font-size:1rem;font-weight:500}.personal-note p{color:var(--muted-foreground);margin:8px 0 12px;font-size:.875rem;line-height:1.8}.collection-credit{color:var(--muted-foreground);align-items:flex-start;gap:8px;padding:19px 4px;font-size:.875rem;display:flex}.youtube-mark{border:1px solid var(--border);border-radius:4px;place-items:center;min-width:20px;height:15px;font-size:.875rem;display:grid}.collection-credit a{color:var(--foreground)}.collection-credit p>span{margin-top:3px;font-size:.875rem;display:inline-block}.workspace-footer{border-top:1px solid var(--border);color:var(--muted-foreground);justify-content:space-between;align-items:center;gap:20px;margin-top:32px;padding:21px 0;font-size:.875rem;display:flex}.workspace-footer .text-button{font-size:.875rem}.collection-total{letter-spacing:-.7px;text-align:right;font-size:1.875rem;font-weight:600;line-height:1.2}.collection-total>span{letter-spacing:0;color:var(--muted-foreground);margin-top:5px;font-size:.875rem;font-weight:400;display:block}.library-tools{gap:12px;display:flex}.search-field{border:1px solid var(--border);min-width:0;height:40px;box-shadow:var(--shadow);color:var(--muted-foreground);border-radius:6px;flex:1;align-items:center;gap:9px;padding:0 12px;display:flex}.search-field>svg{width:17px;height:17px}.search-field input{width:100%;min-width:0;height:38px;color:var(--foreground);background:0 0;border:0;outline:none;font-size:1rem}.search-field:focus-within{outline:2px solid var(--ring);outline-offset:2px}.search-field input:focus-visible{outline:none}input::placeholder,textarea::placeholder{color:var(--muted-foreground)}.search-field kbd{border:1px solid var(--border);background:var(--muted);border-radius:3px;padding:0 5px;font-family:inherit;font-size:.875rem}.select-field select{border:1px solid var(--border);background:var(--background);height:40px;color:var(--foreground);max-width:100%;box-shadow:var(--shadow);border-radius:6px;padding:0 28px 0 12px;font-size:1rem}.filter-chips{flex-wrap:wrap;gap:5px;margin-top:18px;display:flex}.filter-chip{border:1px solid var(--border);min-height:33px;color:var(--muted-foreground);border-radius:6px;padding:6px 10px;font-size:.875rem}.filter-chip.active{background:var(--primary);color:#fff;border-color:var(--primary)}.library-caption{color:var(--muted-foreground);justify-content:space-between;gap:14px;margin:22px 0 17px;font-size:.875rem;display:flex}.video-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;display:grid}.video-grid .video-card{border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}.video-grid .thumbnail-button{border-radius:0}.video-grid .video-copy{padding:13px 14px 10px}.video-grid .video-meta{flex-wrap:wrap;gap:5px;margin-bottom:8px;font-size:.875rem}.core-tag{border:1px solid var(--border);color:var(--foreground);background:var(--secondary);border-radius:4px;margin-left:auto;padding:2px 5px;font-size:.875rem;font-weight:500}.video-grid .video-title{min-height:39px;font-size:1rem}.video-grid .video-bottom{border-top:1px solid var(--border);margin-top:12px;padding-top:6px}.video-grid .save-button{width:32px;height:32px}.empty-state{text-align:center;border:1px dashed var(--border);border-radius:var(--radius);flex-direction:column;justify-content:center;align-items:center;min-height:380px;padding:40px 22px;display:flex}.empty-icon{border:1px solid var(--border);background:var(--muted);border-radius:12px;place-items:center;width:62px;height:62px;margin-bottom:21px;display:grid}.empty-state>svg{color:var(--muted-foreground);margin-bottom:20px}.empty-state h2{letter-spacing:-.5px;font-size:1.5rem;font-weight:600}.empty-state p{max-width:330px;color:var(--muted-foreground);margin:10px 0 22px;font-size:1rem;line-height:1.7}.notes-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;display:grid}.note-card{border:1px solid var(--border);background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}.note-card>span{color:var(--muted-foreground);font-size:.875rem}.note-card h2{margin:8px 0 15px;font-size:1rem;font-weight:500;line-height:1.5}.note-card p{white-space:pre-wrap;overflow-wrap:anywhere;max-height:200px;color:var(--muted-foreground);font-size:1rem;line-height:1.8;overflow:auto}.note-card .text-button{margin-top:18px}.notice{border:1px solid var(--border);background:var(--muted);border-radius:7px;margin-bottom:20px;padding:15px 17px;font-size:1rem;line-height:1.7}.notice a{text-decoration:underline}dialog{border:1px solid var(--border);max-height:92dvh;color:var(--foreground);background:var(--background);border-radius:12px;padding:0;box-shadow:0 16px 60px #0003}dialog::backdrop{background:#0008}body.dialog-open,body.nav-open{overflow:hidden}.lesson-dialog{width:min(840px,100% - 32px)}.dialog-top{z-index:4;border-bottom:1px solid var(--border);background:var(--background);justify-content:space-between;align-items:center;padding:12px 22px;display:flex;position:sticky;top:0}.dialog-top>span{color:var(--muted-foreground);font-size:.875rem}.lesson-modal-body{padding:22px 26px}.player{aspect-ratio:16/9;background:#171717;border-radius:7px;position:relative;overflow:hidden}.player>img{object-fit:cover;width:100%;height:100%}.player-start{color:#fff;text-shadow:0 1px 5px #0008;background:#0004;flex-direction:column;justify-content:center;align-items:center;gap:12px;font-size:1rem;display:flex;position:absolute;inset:0}.player-start .large-play{width:59px;height:59px}.player iframe{border:0;width:100%;height:100%}.player-links{color:var(--muted-foreground);justify-content:space-between;align-items:center;gap:12px;margin:12px 0 24px;font-size:.875rem;display:flex}.player-links a{color:var(--foreground);align-items:center;gap:6px;display:inline-flex}.lesson-modal-body h2{letter-spacing:-.65px;margin-top:8px;font-size:1.75rem;font-weight:600;line-height:1.3}.original-title{color:var(--muted-foreground);margin-top:8px;font-size:.875rem;line-height:1.6}.lesson-why{color:var(--muted-foreground);margin-top:13px;font-size:1rem;line-height:1.8}.practice-box{border:1px solid var(--border);background:var(--muted);border-radius:8px;gap:13px;margin-top:22px;padding:18px;display:flex}.practice-box>span{color:var(--muted-foreground)}.practice-box h3{font-size:1rem;font-weight:500}.practice-box p{color:var(--muted-foreground);margin-top:6px;font-size:1rem;line-height:1.75}.practice-box a{text-underline-offset:3px;margin-top:10px;font-size:.875rem;text-decoration:underline;display:inline-block}.notes-label{justify-content:space-between;align-items:center;gap:12px;margin:25px 0 10px;font-size:1rem;font-weight:500;display:flex}.notes-label>span{color:var(--muted-foreground);font-size:.875rem;font-weight:400}textarea{resize:vertical;border:1px solid var(--border);background:var(--background);width:100%;min-height:110px;color:var(--foreground);box-shadow:var(--shadow);border-radius:6px;padding:13px;font-size:1rem;line-height:1.8;display:block}.dialog-actions{z-index:4;background:var(--background);border-top:1px solid var(--border);align-items:center;gap:9px;padding:16px 26px;display:flex;position:sticky;bottom:0}#mark-complete{margin-left:auto}#mark-complete[aria-pressed=true]{background:var(--secondary);color:var(--foreground);border-color:var(--border)}.info-dialog{width:min(600px,100% - 32px);padding:32px;position:fixed}.dialog-close{position:absolute;top:13px;right:13px}.info-dialog h2{letter-spacing:-.5px;margin:12px 0 15px;font-size:1.625rem;font-weight:600}.info-dialog h3{margin:22px 0 7px;font-size:1rem;font-weight:500}.info-dialog p{color:var(--muted-foreground);font-size:1rem;line-height:1.8}.info-dialog>a{margin-top:9px;font-size:.875rem;text-decoration:underline;display:inline-block}.info-dialog p+p{margin-top:14px}.settings-actions{flex-wrap:wrap;gap:12px;margin:22px 0 14px;display:flex}.import-label{cursor:pointer;position:relative;overflow:hidden}.import-label input{opacity:0;cursor:pointer;width:100%;position:absolute;inset:0}.import-label:focus-within{outline:2px solid var(--ring);outline-offset:3px}.info-dialog hr{border:0;border-top:1px solid var(--border);margin-top:25px}.danger{color:var(--destructive);margin:12px 0}.button-danger{color:#fff;background:var(--destructive)}#reset-confirmation p{margin-bottom:12px;font-size:.875rem}#settings-status{margin-top:16px;font-size:.875rem}.toast{border:1px solid var(--border);background:var(--foreground);max-width:calc(100vw - 30px);color:var(--background);z-index:60;border-radius:8px;padding:13px 20px;font-size:1rem;line-height:1.6;position:fixed;bottom:24px;left:calc(50% + 140px);transform:translate(-50%);box-shadow:0 4px 20px #0002}@media (hover:hover) and (pointer:fine){.nav-link:hover,.chapter-nav-link:hover,.icon-button:hover{background:var(--accent);color:var(--foreground)}.button-dark:hover{background:#333}.button-outline:hover,.filter-chip:not(.active):hover{background:var(--muted);color:var(--foreground)}.text-button:hover,.video-title:hover{text-underline-offset:3px;text-decoration:underline}.thumbnail-button:hover .thumbnail-play,.thumbnail-button:focus-visible .thumbnail-play,.route-step:hover>svg{opacity:1}a.summary-card:hover{background:var(--sidebar)}}@media (width>=1600px){.path-layout{grid-template-columns:minmax(0,1fr) 320px;gap:28px}.next-lesson{min-height:252px}.next-copy h2{font-size:2rem}.next-copy p,.chapter-description{font-size:1rem}.lesson-row .thumbnail-button{width:160px}.video-copy>p,.route-step strong{font-size:1rem}}@media (width<=1200px){.sidebar{width:260px;padding-left:12px;padding-right:12px}.workspace{margin-left:260px}.topbar{padding:0 22px}main{padding:26px 22px 0}.path-layout{grid-template-columns:minmax(0,1fr) 230px;gap:18px}.next-lesson{gap:16px;min-height:236px;padding:13px}.next-copy h2{font-size:1.5rem}.lesson-row .thumbnail-button{width:132px}.lesson-row{gap:10px}.lesson-open{display:none}.chapter-panel{padding:18px}.chapter-header .eyebrow>span,.study-rhythm>span{display:none}.route-card{padding:18px 13px 12px}.route-step{gap:8px}.route-step strong,.route-step small{font-size:.875rem}.summary-card{padding:16px}.summary-card>p{font-size:.875rem}.toast{left:calc(50% + 130px)}}@media (width<=1360px){.path-layout{grid-template-columns:minmax(0,1fr)}.path-rail{display:none}.next-lesson{min-height:228px}.next-copy{padding:9px}.next-copy h2{font-size:1.75rem}.lesson-row .thumbnail-button{width:144px}.lesson-open{display:inline-flex}.video-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.notes-grid{grid-template-columns:1fr}.overview-stats{gap:12px}.summary-card>div{font-size:.875rem}.summary-card>div>svg{display:none}.summary-card>strong{font-size:1.875rem}.summary-card>p{line-height:1.6}}@media (width<=760px){.sidebar{width:260px;transition:transform .2s var(--ease);transform:translate(-100%)}.sidebar.open{transform:translate(0)}.mobile-close{display:flex;position:absolute;top:23px;right:13px}.mobile-menu{margin-left:-6px;display:inline-flex}.nav-overlay{z-index:19;background:#0006;position:fixed;inset:0}.workspace{min-height:100dvh;box-shadow:none;border:0;border-radius:0;margin:0}.topbar{height:58px;padding:0 20px}.breadcrumb{gap:9px}.breadcrumb>span:first-of-type,.crumb-slash{display:none}.topbar-right{gap:7px}.academic-label{font-size:.875rem}main{padding:25px 20px 0}h1{font-size:1.75rem}.page-heading{gap:15px;margin-bottom:21px}.page-description{max-width:300px;font-size:1rem}.page-heading>.button{white-space:nowrap;gap:6px;padding:8px 10px;font-size:.875rem}.overview-stats{gap:10px;margin-bottom:24px}.summary-card{padding:13px}.summary-card>div{font-size:.875rem}.summary-card>strong{font-size:1.75rem}.stat-denominator{font-size:1rem}.summary-card>p{font-size:.875rem}.next-copy h2{font-size:1.625rem}.chapter-header h2{font-size:1.25rem}.chapter-footer .text-button,.chapter-footer .button{font-size:.875rem}.chapter-description{font-size:1rem}.video-grid{gap:16px}.video-grid .video-copy{padding:12px}.video-grid .video-title{font-size:1rem}.library-caption>span{display:none}.library-caption,.filter-chip{font-size:.875rem}.collection-total{font-size:1.75rem}.collection-total>span{font-size:.875rem}.select-field select{padding-left:9px;padding-right:18px;font-size:.875rem}.search-field input{font-size:.875rem}.search-field kbd{display:none}.workspace-footer{gap:10px;font-size:.875rem}.workspace-footer .text-button{font-size:.875rem}.lesson-modal-body{padding:17px}.dialog-top{padding:10px 15px}.dialog-top>span{font-size:.875rem}.dialog-actions{flex-wrap:wrap;gap:8px;padding:13px 16px}.dialog-actions .button{padding:8px 10px;font-size:.875rem}.lesson-modal-body h2{font-size:1.625rem}.lesson-why{font-size:1rem}.practice-box{gap:10px;padding:15px}.practice-box p{font-size:.875rem}.info-dialog{padding:29px 24px}.info-dialog h2{font-size:1.5rem}.toast{left:50%}}@media (width<=480px){.page-heading{flex-direction:column;align-items:flex-start;gap:14px}.page-heading>.button{font-size:.875rem}.overview-stats{grid-template-columns:1fr;gap:8px}.summary-card{justify-content:space-between;align-items:center;gap:16px;padding:14px 16px;display:flex}.summary-card>div{min-height:27px;font-size:.875rem}.summary-card>strong{margin-bottom:0;font-size:1.625rem}.summary-card>p{display:none}.stat-denominator,.section-label{font-size:1rem}.section-label>span:last-child{font-size:.875rem}.next-lesson{grid-template-columns:1fr;gap:15px;padding:12px}.next-image{aspect-ratio:16/9}.next-copy{padding:3px 4px 5px}.next-copy h2{font-size:1.625rem}.next-copy .button{min-height:38px}.study-rhythm{gap:7px;font-size:.875rem}.study-rhythm>svg{width:15px}.chapter-panel{padding:16px 13px}.chapter-icon{width:35px;height:35px}.chapter-header{gap:9px}.chapter-meta{gap:9px;font-size:.875rem}.lesson-row{grid-template-columns:20px 110px minmax(0,1fr);align-items:start;gap:8px;padding:15px 0;display:grid}.lesson-number{padding-top:20px;font-size:.875rem}.lesson-row .thumbnail-button{width:110px;margin-top:4px}.lesson-row .video-meta,.lesson-row .video-title{font-size:.875rem}.lesson-row .video-copy>p,.lesson-open{display:none}.lesson-row .video-bottom{font-size:.875rem}.lesson-row .save-button{width:28px;height:28px}.done-badge{gap:1px;padding:1px 3px;font-size:.875rem;top:3px;left:3px}.done-badge svg{width:9px;height:9px}.checkpoint{gap:6px;padding:12px}.checkpoint p{font-size:.875rem}.chapter-footer{flex-direction:column;align-items:stretch;gap:14px}.chapter-footer .text-button{text-align:left;max-width:none;font-size:.875rem}.chapter-footer .button{gap:5px;padding:7px 9px;font-size:.875rem}.library-tools{flex-wrap:wrap;gap:10px}.search-field{flex-basis:100%}.video-grid{grid-template-columns:1fr;gap:20px}.video-grid .video-title{min-height:auto;font-size:1rem}.video-grid .video-meta,.video-grid .core-tag{font-size:.875rem}.video-grid .video-copy{padding:14px}.video-grid .duration{font-size:.875rem}.collection-total{display:none}.empty-state{min-height:340px}.empty-state h2{font-size:1.375rem}.notes-label{flex-wrap:wrap;font-size:1rem}.notes-label>span{font-size:.875rem}.player-links{flex-wrap:wrap;font-size:.875rem}.dialog-actions .button{min-height:40px;font-size:.875rem}#next-modal{flex-basis:100%}.lesson-dialog{border-radius:10px;width:calc(100% - 16px);max-height:95dvh}.workspace-footer{flex-direction:column;align-items:flex-start;gap:8px;margin-top:25px}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}button:active:not(:disabled),.button:active{transform:none}}.study-rhythm{flex-wrap:nowrap;align-items:flex-start}.study-rhythm>p{flex:1;min-width:0}.chapter-nav-link>span:nth-child(2),.route-step>span:nth-child(2){min-width:0}.route-step strong,.route-step small{overflow-wrap:anywhere}.route-step strong{font-size:1rem}.route-step small{font-size:.875rem}.chapter-meta{line-height:1.6}.video-meta{flex-wrap:wrap}.video-title,.video-grid .video-title{font-size:1.0625rem}.video-copy>p,.next-copy p,.chapter-description,.lesson-why,.practice-box p,.info-dialog p,.note-card p{font-size:1rem;line-height:1.75}.info-dialog .small-copy{font-size:.9375rem}.search-field,.select-field select{height:auto;min-height:44px}.search-field input{height:42px}textarea{font-size:1rem}.dialog-actions{flex-wrap:wrap}.dialog-actions .button{min-height:44px}.summary-card>strong{flex-shrink:0}@media (width<=1360px) and (width>=761px){.overview-stats{grid-template-columns:repeat(3,minmax(0,1fr))}.summary-card>div{font-size:.875rem}}@media (width<=760px){.sidebar{width:min(300px,88vw)}.topbar{gap:8px;height:auto;min-height:64px;padding:10px 14px}.academic-label{white-space:nowrap;font-size:.875rem}.breadcrumb{font-size:.875rem}.topbar-right{gap:3px}.chapter-header,.notes-label,.library-caption{flex-wrap:wrap}}@media (width<=480px){.summary-card>div{min-height:auto;font-size:.875rem}.summary-card>strong{margin:0;font-size:1.5rem}.lesson-row{grid-template-columns:22px minmax(0,1fr);gap:12px 10px}.lesson-row .thumbnail-button{grid-column:2;width:100%;max-width:220px}.lesson-row .video-copy{grid-column:2}.lesson-row .video-title{font-size:1rem}.lesson-row .video-copy>p{font-size:.9375rem;display:block}.lesson-row .duration,.lesson-row .video-meta,.lesson-row .video-bottom{font-size:.875rem}.done-badge{gap:4px;padding:2px 5px;font-size:.875rem}.done-badge svg{width:13px;height:13px}.checkpoint{padding:14px 12px}.checkpoint p{font-size:.9375rem}.dialog-actions .button{font-size:.875rem}#mark-complete{margin-left:0}.dialog-actions{justify-content:space-between}}.chapter-extras{border-top:1px solid var(--border,#e5e5e5);margin-top:32px;padding-top:28px}.extras-heading{flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:10px;display:flex}.extras-heading h3{margin:0;font-size:1.25rem}.extras-heading>span{color:#666;font-size:.875rem}.extras-description{margin:12px 0;font-size:1rem;line-height:1.75}.extras-hint{color:#666;margin-bottom:12px;font-size:.875rem;line-height:1.7}.more-extras summary{cursor:pointer;padding:16px 0;font-size:1rem;font-weight:500}.more-extras summary:focus-visible{outline-offset:4px;outline:2px solid #171717}.mobile-tabs{display:none}@media (width<=760px){body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,a,summary,select{touch-action:manipulation;-webkit-tap-highlight-color:transparent}button:active,.mobile-tabs a:active{opacity:.65}.workspace{border:0;border-radius:0;margin:0}.topbar{z-index:10;padding-top:max(8px, env(safe-area-inset-top));backdrop-filter:blur(16px);background:#fffffff0;position:sticky;top:0}.breadcrumb>span,.crumb-slash{display:none}.breadcrumb strong{font-size:1rem}.topbar .icon-button,.mobile-close{min-width:44px;min-height:44px}main{padding:24px max(16px, env(safe-area-inset-right)) calc(96px + env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left))}.mobile-tabs{z-index:15;padding:6px 12px max(6px, env(safe-area-inset-bottom));backdrop-filter:blur(20px);background:#fffffff5;border-top:1px solid #e5e5e5;grid-template-columns:repeat(3,minmax(0,1fr));display:grid;position:fixed;bottom:0;left:0;right:0}.mobile-tabs a,.mobile-tabs button{color:#666;background:0 0;border:0;border-radius:10px;flex-direction:column;justify-content:center;align-items:center;gap:3px;min-height:56px;font-size:.875rem;text-decoration:none;display:flex}.mobile-tabs .active{color:#171717;background:#f0f0f0;font-weight:600}.sidebar{z-index:30;padding-top:max(24px, env(safe-area-inset-top));padding-bottom:max(20px, env(safe-area-inset-bottom));overscroll-behavior:contain}.nav-overlay{z-index:25}.chapter-nav-link,.nav-link{min-height:48px}.chapter-section{scroll-margin-top:90px}.page-heading h1{letter-spacing:-.025em;font-size:1.875rem}.page-heading>.button{display:none}.next-lesson,.chapter-panel,.summary-card,.video-grid .video-card{border-radius:16px}.filter-chips{flex-wrap:nowrap;padding-bottom:10px;scroll-padding:16px;overflow-x:auto}.filter-chip{flex:none;min-height:44px;padding:8px 14px}.video-title{text-align:left;min-height:44px}.more-extras summary,.text-button{min-height:44px}.lesson-dialog{overscroll-behavior:contain;border:0;border-radius:0;width:100%;max-width:100%;height:100dvh;max-height:100dvh;margin:0;position:fixed;inset:0}.lesson-dialog[open]{flex-direction:column;display:flex}.dialog-top{padding:max(8px, env(safe-area-inset-top)) 16px 8px;flex:none;gap:8px;position:relative}.dialog-top .icon-button{min-width:44px;min-height:44px}.lesson-modal-body{overscroll-behavior:contain;flex:auto;min-height:0;padding:16px;overflow-y:auto}.dialog-actions{padding:12px 16px max(12px, env(safe-area-inset-bottom));flex:none;position:relative}.dialog-actions .button{flex:1;min-height:48px}#next-modal{flex-basis:auto}.info-dialog{max-height:calc(100dvh - 32px - env(safe-area-inset-top) - env(safe-area-inset-bottom))}}@media (prefers-reduced-transparency:reduce),(prefers-contrast:more){.mobile-tabs,.topbar{backdrop-filter:none;background:#fff}}@media (width<=760px){.dialog-actions .button,#next-modal{flex:1 1 0}}