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var(--line)}.header-inner{height:var(--header-h);display:flex;align-items:center;gap:28px}.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);flex:none}.brand:hover{color:var(--ink)}.brand-text{display:grid;line-height:1.1}.brand-name{font-weight:800;font-size:1.125rem;letter-spacing:-.01em}.brand-domain{font-size:.75rem;color:var(--muted)}.main-nav{display:flex;align-items:center;gap:4px}.main-nav a{padding:8px 12px;border-radius:var(--radius);text-decoration:none;color:var(--ink-2);font-weight:600;font-size:var(--fs-sm)}.main-nav a:hover{color:var(--ink);background:var(--paper-2)}.main-nav a.active{color:var(--violet)}.main-nav .nav-auth,.main-nav .nav-mobile-only{display:none}.header-actions{margin-left:auto;display:flex;align-items:center;gap:8px}.header-auth{display:flex;gap:8px}.nav-toggle{display:none}.user-menu{position:relative}.user-btn{display:flex;align-items:center;gap:8px;border:1px solid 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p{margin-top:12px;max-width:36ch}.footer-links{display:grid;gap:8px;align-content:start}.footer-links a{color:var(--ink-2);text-decoration:none}.footer-links a:hover{color:var(--violet)}.footer-contact{display:grid;gap:6px;align-content:start}.footer-bottom{margin-top:28px;padding-top:16px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:8px 24px;justify-content:space-between;color:var(--muted);font-size:var(--fs-xs)}@media (max-width: 720px){.footer-inner{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1 / -1}}.page-head{border-bottom:1px solid var(--line);background:var(--paper-2)}.page-head-inner{padding-top:36px;padding-bottom:28px;display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px}.page-lead{margin-top:8px;color:var(--ink-2);max-width:64ch}.crumbs{display:flex;flex-wrap:wrap;gap:8px;font-size:var(--fs-sm);margin-bottom:10px;color:var(--muted)}.crumbs a{text-decoration:none;font-weight:500}.filters{display:grid;gap:12px;margin-bottom:24px}.filters-row{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:center}.filters-right{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.empty{text-align:center;padding:48px 16px;display:grid;gap:10px;justify-items:center;border:1.5px dashed var(--line-strong);border-radius:12px}.empty-title{font-weight:700;font-size:var(--fs-md)}.empty-text{color:var(--muted);max-width:48ch}.empty .btn{margin-top:6px}.loading{display:flex;align-items:center;justify-content:center;gap:10px;padding:48px 16px;color:var(--muted);font-size:var(--fs-sm)}.loading-dot{width:10px;height:10px;border-radius:50%;background:var(--violet);animation:blink 1s ease-in-out infinite}@keyframes blink{50%{opacity:.25}}.error-box{padding:16px;border-radius:10px;background:var(--red-soft);color:var(--red);display:flex;gap:12px;align-items:center;justify-content:space-between}.notice{padding:14px 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#00000073}.modal-wide{width:min(720px,100%)}.modal-head{display:flex;justify-content:space-between;align-items:center;padding:18px 20px 6px}.modal-body{padding:8px 20px 4px;display:grid;gap:10px}.modal-actions{display:flex;justify-content:flex-end;flex-wrap:wrap;gap:10px;padding:18px 20px 20px}.hero{border-bottom:1px solid var(--line)}.hero-inner{position:relative;display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:48px;align-items:center;padding-top:64px;padding-bottom:64px}.hero-inner:before{content:"";position:absolute;top:0;bottom:0;left:calc(var(--gutter) - 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b{font-size:1.6rem;font-weight:800;letter-spacing:-.02em}.grade-tile:hover{border-color:var(--violet);color:var(--violet)}.grade-tile.is-mine{background:var(--violet);border-color:var(--violet);color:var(--on-violet)}.grade-tile.is-mine span{color:var(--on-violet);opacity:.8}.daily{padding:24px;position:relative}.daily-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px}.daily-head h2{font-size:var(--fs-md)}.daily-tag{font-size:var(--fs-xs);font-weight:600;padding:3px 9px;border-radius:5px;color:var(--subject);background:color-mix(in srgb,var(--subject) 12%,transparent)}:root[data-theme=dark] .daily-tag{color:var(--ink)}@media (prefers-color-scheme: dark){:root:not([data-theme=light]) .daily-tag{color:var(--ink)}}.daily-q{font-family:var(--serif);font-size:1.0625rem;line-height:1.65}.daily-options{display:grid;grid-template-columns:1fr 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var(--ink);display:grid;place-items:center;font-weight:800}.teacher-note{padding:28px 28px 22px;background-color:var(--surface);background-image:linear-gradient(to bottom,var(--grid-strong) 1px,transparent 1px);background-size:100% 32px;background-position:0 23px}.teacher-note p{font-family:var(--hand);font-size:1.35rem;line-height:32px;color:var(--violet)}.teacher-note .signature{margin-top:8px;text-align:right;color:var(--red)}.signup-band{display:flex;flex-wrap:wrap;gap:20px;justify-content:space-between;align-items:center;padding:32px;border-radius:16px;background:var(--violet);color:var(--on-violet)}.signup-band p{opacity:.85;margin-top:6px}.signup-band .btn{background:var(--on-violet);color:var(--violet);border-color:var(--on-violet)}@media (max-width: 960px){.hero-inner{grid-template-columns:1fr;gap:36px;padding-top:44px;padding-bottom:44px}.hero-inner:before{display:none}.how{grid-template-columns:1fr;gap:28px}}@media (max-width: 520px){.grade-row{gap:5px}.grade-tile{padding:6px 0 8px;border-radius:8px}.grade-tile b{font-size:1.3rem}.grade-tile span{font-size:.62rem}.daily-options{grid-template-columns:1fr}.daily{padding:18px}.section{padding:40px 0}.signup-band{padding:24px}}.covers{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:22px}.cover{display:flex;flex-direction:column;text-decoration:none;color:var(--ink);min-width:0}.cover-face{position:relative;height:200px;border-radius:4px 12px 12px 4px;background-color:var(--subject);background-image:linear-gradient(to right,rgba(0,0,0,.22) 0 14px,rgba(255,255,255,.12) 14px 16px,transparent 16px),repeating-linear-gradient(135deg,rgba(255,255,255,.06) 0 2px,transparent 2px 9px);box-shadow:inset 0 0 0 1px #00000014,0 12px 24px -18px #0000008c;overflow:hidden;padding:18px 18px 18px 30px;display:flex;flex-direction:column;justify-content:flex-end}.cover:hover .cover-face{box-shadow:inset 0 0 0 1px #00000014,0 16px 30px -16px #0009}.cover-grade{position:absolute;top:6px;right:16px;font-size:4.75rem;font-weight:800;letter-spacing:-.05em;color:#ffffffeb;line-height:1}.cover-label{background:#fffdf8;color:#1f1a3d;border-radius:8px;padding:10px 12px 12px;box-shadow:0 2px #0000001f;border:1px solid rgba(0,0,0,.06)}.cover-fields{display:flex;gap:14px;font-size:.72rem;color:#6b6690;margin-bottom:4px}.cover-fields span{flex:1;border-bottom:1px dotted #b6b0d3;white-space:nowrap}.cover-fields b{color:#1f1a3d;font-family:var(--hand);font-size:.95rem;font-weight:400;margin-left:4px}.cover-title{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;font-size:.98rem;line-height:1.35;font-weight:700}.cover-meta{display:flex;flex-wrap:wrap;gap:4px 14px;margin-top:12px;font-size:var(--fs-sm);color:var(--muted)}.cover-progress{margin-top:10px;display:flex;align-items:center;gap:10px;font-size:var(--fs-xs);color:var(--ink-2)}.register-wrap{overflow-x:auto}.register{width:100%;border-top:2px solid var(--ink);font-size:var(--fs-sm)}.register th{text-align:left;font-weight:600;color:var(--muted);font-size:var(--fs-xs);padding:10px 12px;border-bottom:1px solid var(--line-strong);white-space:nowrap}.register td{padding:14px 12px;border-bottom:1px solid var(--line);vertical-align:middle}.register tbody tr:hover{background:color-mix(in srgb,var(--violet-soft) 55%,transparent)}.reg-title{min-width:260px}.reg-title a{color:var(--ink);font-weight:600;font-size:var(--fs-base);text-decoration:none}.reg-title a:hover{color:var(--violet);text-decoration:underline}.reg-kind{display:block;color:var(--muted);font-size:var(--fs-xs);margin-top:2px}.reg-icon{display:inline-flex;align-items:center;gap:6px;white-space:nowrap;color:var(--ink-2)}.reg-action{text-align:right;white-space:nowrap}.row-actions{display:flex;gap:2px;justify-content:flex-end;align-items:center}.hand-score{font-family:var(--hand);color:var(--red);font-size:1.45rem;line-height:1}@media (max-width: 760px){.register,.register tbody,.register tr,.register td{display:block;width:100%}.register thead{display:none}.register tr{padding:14px 2px;border-bottom:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;gap:8px 12px}.register td{border:0;padding:0}.register td.reg-title{grid-column:1 / -1;min-width:0}.register td[data-label]:before{content:attr(data-label);display:block;font-size:.72rem;color:var(--muted)}.register td.reg-action{grid-column:1 / -1;text-align:left}.register td.reg-action .btn{width:100%}.row-actions{justify-content:flex-start}}.materials{list-style:none;margin:0;padding:0;border-top:2px solid var(--ink)}.material{display:flex;align-items:center;gap:16px;padding:16px 4px;border-bottom:1px solid var(--line)}.material-icon{flex:none;width:44px;height:52px;border-radius:4px 10px 4px 4px;display:grid;place-items:center;color:var(--subject);background:color-mix(in srgb,var(--subject) 11%,var(--surface));border:1px solid color-mix(in srgb,var(--subject) 25%,transparent)}:root[data-theme=dark] .material-icon{color:var(--ink)}@media (prefers-color-scheme: dark){:root:not([data-theme=light]) .material-icon{color:var(--ink)}}.material-body{flex:1;min-width:0}.material-title{font-weight:600}.material-meta{display:flex;flex-wrap:wrap;align-items:center;gap:4px 16px;margin-top:4px;font-size:var(--fs-sm);color:var(--muted)}.material-actions{display:flex;gap:8px;flex:none}@media (max-width: 640px){.material{flex-wrap:wrap}.material-actions{width:100%;padding-left:60px}}.grade-head{border-bottom:1px solid var(--line);background:var(--paper-2)}.grade-head-inner{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:16px;padding-top:28px;padding-bottom:24px}.grade-head h1{font-size:4rem;line-height:1;letter-spacing:-.04em}.grade-head h1 span{font-size:var(--fs-lg);font-weight:600;letter-spacing:0;color:var(--muted);margin-right:4px}.grade-switch{display:flex;gap:6px;flex-wrap:wrap}.grade-switch a{width:40px;height:40px;display:grid;place-items:center;border-radius:8px;border:1.5px solid var(--line-strong);text-decoration:none;color:var(--ink-2);font-weight:700;background:var(--surface)}.grade-switch a:hover{border-color:var(--violet);color:var(--violet)}.grade-switch a[aria-current=page]{background:var(--ink);border-color:var(--ink);color:var(--paper)}.grade-block{margin-top:40px}.course-hero{background-color:var(--subject);background-image:repeating-linear-gradient(135deg,rgba(255,255,255,.05) 0 2px,transparent 2px 10px);color:#fff}.course-hero-inner{padding-top:32px;padding-bottom:36px}.course-hero .crumbs,.course-hero .crumbs a{color:#ffffffd1}.course-hero h1{max-width:24ch;font-size:clamp(1.75rem,4vw,2.5rem)}.course-desc{margin-top:12px;max-width:64ch;opacity:.92}.course-facts{display:flex;flex-wrap:wrap;gap:12px 36px;margin:22px 0 0}.course-facts dt{font-size:var(--fs-xs);opacity:.75}.course-facts dd{margin:0;font-weight:700}.course-cta{margin-top:26px;display:flex;flex-wrap:wrap;gap:16px 28px;align-items:center}.course-progress{display:flex;align-items:center;gap:12px;min-width:240px;font-size:var(--fs-sm)}.course-progress .progress{background:#ffffff47}.course-progress .progress>span{background:#fff}.syllabus-title{margin:8px 0 14px}.syllabus{display:grid;gap:12px;max-width:860px}.chapter{border:1px solid var(--line);border-radius:12px;background:var(--surface);overflow:hidden}.chapter summary{display:flex;justify-content:space-between;gap:12px;align-items:center;padding:14px 18px;font-weight:700;cursor:pointer;list-style:none;background:var(--paper-2)}.chapter summary::-webkit-details-marker{display:none}.chapter ul{list-style:none;margin:0;padding:4px 0}.lesson-row{display:grid;grid-template-columns:22px 1fr auto auto;gap:12px;align-items:center;padding:11px 18px;text-decoration:none;color:var(--ink)}.lesson-row:hover{background:var(--paper-2);color:var(--ink)}.lesson-row.is-done .lesson-name{color:var(--ink-2)}.lesson-badges{display:flex;gap:6px}.lesson-time{font-size:var(--fs-sm);color:var(--muted);font-variant-numeric:tabular-nums}.ic-done{color:var(--green)}.ic-lock{color:var(--muted)}.ic-play{color:var(--violet)}@media (max-width: 600px){.lesson-row{grid-template-columns:22px 1fr auto}.lesson-badges{grid-column:2;grid-row:2}}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:32px;padding-top:24px;padding-bottom:56px}.video-box{aspect-ratio:16 / 9;border-radius:12px;overflow:hidden;background:#17132e;color:#e9e6f7;display:grid;place-items:center;text-align:center;padding:16px}.video-box iframe{width:100%;height:100%;border:0;display:block}.video-box:has(iframe){padding:0}.video-box .muted{color:#b8b3d4}.video-box .muted a{color:#d0c3ff}.video-msg{font-weight:600;margin:10px 0 6px}.video-locked 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var(--violet);background:var(--violet-soft);color:var(--violet)}.homework>div{flex:1;color:var(--ink)}.lesson-nav{display:flex;justify-content:space-between;gap:12px;margin-top:28px}.lesson-aside{align-self:start;position:sticky;top:calc(var(--header-h) + 16px);max-height:calc(100vh - var(--header-h) - 32px);overflow:auto;border:1px solid var(--line);border-radius:12px;background:var(--surface);padding:16px 0}.aside-title{font-weight:700;padding:0 16px 8px}.aside-chapter-title{font-size:var(--fs-xs);font-weight:600;color:var(--muted);padding:12px 16px 4px}.aside-chapter ul{list-style:none;margin:0;padding:0}.aside-lesson{display:grid;grid-template-columns:20px 1fr;gap:10px;align-items:start;padding:8px 16px;text-decoration:none;color:var(--ink);font-size:var(--fs-sm);line-height:1.4}.aside-lesson:hover{background:var(--paper-2);color:var(--ink)}.aside-lesson.is-current{background:var(--violet-soft);color:var(--violet);font-weight:600;box-shadow:inset 3px 0 0 var(--violet)}@media (max-width: 960px){.lesson-layout{grid-template-columns:1fr}.lesson-aside{position:static;max-height:none}}@media (max-width: 520px){.lesson-notes{padding:18px}.homework{flex-wrap:wrap}}.exam-header{display:grid;grid-template-columns:1fr 1.6fr;gap:16px;text-align:center;font-family:var(--serif);font-size:.95rem;line-height:1.5;padding-bottom:18px;margin-bottom:8px;border-bottom:1px solid var(--line)}.eh-strong{font-weight:700}.eh-under{font-weight:700;display:inline-block;padding-bottom:2px;border-bottom:1.5px solid var(--ink)}.eh-small{font-size:.875rem;color:var(--ink-2)}.exam-intro{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:28px;align-items:start}.exam-intro-sheet{padding:28px}.exam-desc{margin:18px 0;color:var(--ink-2)}.structure{width:100%;font-size:var(--fs-sm);margin:12px 0}.structure caption{text-align:left;font-weight:700;font-size:var(--fs-base);padding-bottom:8px}.structure th,.structure td{border:1px solid var(--line-strong);padding:8px 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var(--line)}.exam-bar-inner{height:var(--bar-h);display:flex;align-items:center;gap:16px}.exam-bar-title{flex:1;min-width:0;font-weight:600;font-size:var(--fs-sm);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.timer{display:inline-flex;align-items:center;gap:8px;font-size:1.25rem;font-weight:700;font-variant-numeric:tabular-nums;padding:4px 12px;border-radius:8px;background:var(--paper-2)}.timer.is-low{color:var(--red);background:var(--red-soft)}.exam-bar-count{font-size:var(--fs-sm);color:var(--ink-2);white-space:nowrap}.sheet-toggle,.sheet-close{display:none}.exam-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:24px;padding-top:24px;padding-bottom:64px;align-items:start}.exam-paper,.review-paper{padding:32px 40px}.exam-part{margin-top:20px}.part-title{margin:24px 0 8px;font-family:var(--serif)}.part-title h2{font-size:1.05rem;font-weight:700}.part-title p{font-size:.92rem;font-style:italic;color:var(--ink-2)}.question,.review{padding:18px 0 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var(--line);border-radius:10px;background:var(--surface);text-align:left;font-family:var(--serif);font-size:1.0625rem;min-height:48px;color:var(--ink)}.option:hover{border-color:var(--violet)}.option.is-on{border-color:var(--violet);background:var(--violet-soft)}.option.is-on .bubble{background:var(--bubble-on);border-color:var(--bubble-on);color:var(--bubble-on-text)}.tf-table{width:100%;margin-top:12px;font-family:var(--serif);font-size:1.0625rem}.tf-table th,.tf-table td{border-top:1px solid var(--line);padding:10px 8px;vertical-align:middle;text-align:left}.tf-table tbody th{width:32px;font-weight:700}.tf-choice{width:168px}.tf-choice>div{display:flex;gap:6px;justify-content:flex-end}.bubble-btn{height:34px;min-width:70px;border-radius:999px;border:1.5px solid 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