.admin-header{position:sticky;top:0;z-index:50;background:#0e1116e6;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);padding-top:env(safe-area-inset-top)}.admin-bar{display:flex;align-items:center;gap:.75rem;flex-wrap:wrap;padding-block:.7rem}.admin-bar .brand{margin-right:auto}.admin-tabs{display:flex;gap:.25rem;overflow-x:auto;scrollbar-width:none;border-top:1px solid var(--border);padding-block:.4rem}.admin-tabs::-webkit-scrollbar{display:none}.admin-tab{flex:none;padding:.5rem .85rem;border-radius:var(--radius-sm);color:var(--text-muted);font-size:.9rem;font-weight:550;white-space:nowrap}.admin-tab:hover{background:var(--surface-hover);color:var(--text);text-decoration:none}.admin-tab[aria-current=page]{background:var(--accent-soft);color:#a9caf9}.admin-page{padding-block:2rem 4rem}.admin-title{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center;justify-content:space-between;margin-bottom:1.5rem}.admin-title h1{font-size:1.4rem}.admin-title p{color:var(--text-muted);font-size:.9rem;margin:.2rem 0 0}.login-wrap{min-height:100dvh;display:grid;place-items:center;padding:1.5rem}.login-card{width:100%;max-width:22rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.75rem;box-shadow:var(--shadow)}.login-card h1{font-size:1.25rem;margin-bottom:.3rem}.login-card>p{color:var(--text-muted);font-size:.88rem;margin-bottom:1.5rem}.field{display:grid;gap:.35rem;margin-bottom:1rem}.field>label{font-size:.82rem;font-weight:600;color:var(--text-muted)}.field-hint{font-size:.78rem;color:var(--text-faint)}.input,.textarea,.select{width:100%;min-height:2.6rem;padding:.55rem .7rem;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-size:1rem}.input:focus,.textarea:focus,.select:focus{border-color:var(--accent);outline:none}.textarea{min-height:6rem;resize:vertical;line-height:1.6;font-family:inherit}.textarea-code{font-family:var(--font-mono);font-size:.9rem}.field-row{display:grid;gap:.75rem;grid-template-columns:repeat(auto-fit,minmax(min(100%,11rem),1fr))}.form-actions{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center;margin-top:1.25rem;padding-top:1.25rem;border-top:1px solid var(--border)}.form-actions .spacer{flex:1}.repeat{display:grid;gap:.5rem}.repeat-item{display:flex;gap:.5rem;align-items:flex-start}.repeat-item>*:first-child{flex:1;min-width:0}.repeat-fields{flex:1;min-width:0;display:grid;gap:.5rem;grid-template-columns:repeat(auto-fit,minmax(min(100%,10rem),1fr))}.icon-btn{flex:none;display:inline-flex;align-items:center;justify-content:center;width:2.6rem;height:2.6rem;background:transparent;border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-faint);cursor:pointer}.icon-btn:hover{background:var(--surface-hover);color:var(--text);border-color:var(--border-strong)}.icon-btn-danger:hover{background:var(--danger-soft);color:#f2a9a4;border-color:var(--danger)}.icon-btn:disabled{opacity:.35;cursor:not-allowed}.admin-row{display:flex;align-items:center;gap:.75rem;padding:.8rem 1rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm)}.admin-row-main{flex:1;min-width:0}.admin-row-title{font-weight:550;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.admin-row-sub{font-size:.8rem;color:var(--text-faint);display:flex;flex-wrap:wrap;gap:.25rem .6rem}.admin-row-actions{display:flex;gap:.25rem;flex:none}.admin-row-order{display:flex;flex-direction:column;gap:.1rem;flex:none}.admin-row-order .icon-btn{width:1.9rem;height:1.35rem}@media(max-width:34rem){.admin-row{flex-wrap:wrap}.admin-row-main{flex-basis:100%;order:-1}}.editor{background:var(--surface);border:1px solid var(--accent);border-radius:var(--radius);padding:1.25rem}.editor h2{font-size:1.05rem;margin-bottom:1.25rem}.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem}.panel+.panel{margin-top:1rem}.panel h2{font-size:1.05rem;margin-bottom:.3rem}.panel>p{color:var(--text-muted);font-size:.875rem;margin-bottom:1.25rem}.dropzone{display:grid;place-items:center;gap:.5rem;padding:2rem 1rem;background:var(--surface);border:1px dashed var(--border-strong);border-radius:var(--radius);color:var(--text-muted);text-align:center;cursor:pointer;transition:border-color .15s ease,background .15s ease}.dropzone:hover,.dropzone.is-over{border-color:var(--accent);background:var(--accent-soft)}.dropzone small{color:var(--text-faint)}.file-url{font-family:var(--font-mono);font-size:.78rem;color:var(--text-faint);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.dropzone.is-busy{cursor:progress;border-style:solid;border-color:var(--accent)}.upload-warn{color:var(--warn)!important}.upload-bar{width:min(24rem,100%);height:.35rem;border-radius:var(--radius-pill);background:var(--surface-high);overflow:hidden}.upload-bar>div{height:100%;background:var(--accent);border-radius:inherit;transition:width .2s ease}.upload-bar-slim{width:min(18rem,100%);height:.25rem;margin-top:.35rem}.file-status{display:inline-flex;align-items:center;gap:.35rem;margin-top:.25rem;font-size:.8rem;color:var(--text-faint)}.file-status.is-working{color:var(--accent-hover)}.file-status.is-failed{color:var(--danger)}.file-thumb{flex:none;width:4.5rem;height:2.6rem;object-fit:cover;border-radius:var(--radius-sm);background:var(--surface-high)}.picker{position:relative}.picker-menu{position:absolute;z-index:30;top:calc(100% + .25rem);right:0;width:min(24rem,calc(100vw - 2.5rem));max-height:18rem;overflow-y:auto;background:var(--surface-high);border:1px solid var(--border-strong);border-radius:var(--radius-sm);box-shadow:var(--shadow);padding:.3rem}.picker-item{display:block;width:100%;padding:.5rem .6rem;background:none;border:0;border-radius:6px;color:var(--text);text-align:left;font-size:.87rem;cursor:pointer}.picker-item:hover{background:var(--surface-hover)}.picker-item small{display:block;color:var(--text-faint);font-size:.75rem}.picker-empty{padding:1rem .6rem;color:var(--text-faint);font-size:.85rem;text-align:center}.toast{position:fixed;left:50%;bottom:max(1.25rem,env(safe-area-inset-bottom));transform:translate(-50%);z-index:90;display:flex;align-items:center;gap:.5rem;max-width:calc(100vw - 2rem);padding:.7rem 1.1rem;background:var(--surface-high);border:1px solid var(--border-strong);border-radius:var(--radius-pill);box-shadow:var(--shadow);font-size:.88rem}.toast-ok svg{color:var(--ok)}.toast-error{border-color:var(--danger)}.toast-error svg{color:var(--danger)}:root{color-scheme:dark;--bg: #0e1116;--surface: #161b22;--surface-hover: #1c232d;--surface-high: #212a36;--border: #2a3441;--border-strong: #3a4756;--text: #e8edf3;--text-muted:#9aa8b8;--text-faint:#6c7c8d;--accent: #4b93f7;--accent-hover:#6ba6f9;--accent-soft: rgba(75, 147, 247, .14);--accent-text: #0b1220;--ok: #3fb27f;--ok-soft: rgba(63, 178, 127, .15);--warn: #e0a33e;--warn-soft: rgba(224, 163, 62, .15);--danger: #e56a63;--danger-soft: rgba(229, 106, 99, .15);--font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;--radius: 12px;--radius-sm: 8px;--radius-pill: 999px;--shell: 68rem;--gap: 1rem;--shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .22);--header-h: 3.5rem}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 1rem)}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:1rem;line-height:1.65;-webkit-font-smoothing:antialiased;overflow-x:hidden}h1,h2,h3,h4{margin:0;line-height:1.25;font-weight:650;text-wrap:balance}h1{font-size:clamp(1.65rem,1.2rem + 2vw,2.4rem);letter-spacing:-.02em}h2{font-size:clamp(1.3rem,1.1rem + 1vw,1.7rem);letter-spacing:-.01em}h3{font-size:1.05rem}p{margin:0 0 1rem}p:last-child{margin-bottom:0}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-hover);text-decoration:underline}img,svg,video{max-width:100%;height:auto}button,input,select,textarea{font:inherit;color:inherit}code,pre,kbd{font-family:var(--font-mono)}:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}.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}.skip-link{position:absolute;left:.5rem;top:-4rem;z-index:100;padding:.6rem 1rem;background:var(--accent);color:var(--accent-text);border-radius:var(--radius-sm);font-weight:600;transition:top .15s ease}.skip-link:focus{top:.5rem;text-decoration:none}.shell{width:100%;max-width:var(--shell);margin:0 auto;padding-inline:clamp(1rem,4vw,2rem)}.page{padding-block:clamp(2rem,5vw,3.5rem);min-height:60vh}.page-head{margin-bottom:2rem}.page-head p{color:var(--text-muted);margin-bottom:0;max-width:60ch}.page-head h1{margin-bottom:.4rem}.stack{display:grid;gap:var(--gap)}.stack-lg{display:grid;gap:1.5rem}.stack-tight{display:grid;gap:.5rem}.site-header{position:sticky;top:0;z-index:50;background:#0e1116d9;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);padding-top:env(safe-area-inset-top)}.header-bar{display:flex;align-items:center;justify-content:space-between;gap:1rem;height:var(--header-h)}.brand{display:inline-flex;align-items:baseline;gap:.5rem;color:var(--text);font-weight:650;letter-spacing:-.01em;white-space:nowrap;min-width:0}.brand:hover{color:var(--text);text-decoration:none}.brand-mark{color:var(--accent)}.brand-year{font-size:.78rem;font-weight:500;color:var(--text-faint);font-variant-numeric:tabular-nums}.nav-desktop ul{display:flex;align-items:center;gap:.25rem;list-style:none;margin:0;padding:0}.nav-link{display:block;padding:.45rem .7rem;border-radius:var(--radius-sm);color:var(--text-muted);font-size:.92rem;font-weight:500;transition:background .15s ease,color .15s ease}.nav-link:hover{background:var(--surface-hover);color:var(--text);text-decoration:none}.nav-link[aria-current=page]{color:var(--text);background:var(--accent-soft)}.menu-toggle{display:none;align-items:center;justify-content:center;width:2.75rem;height:2.75rem;margin-right:-.5rem;background:none;border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);cursor:pointer}.menu-toggle:hover{background:var(--surface-hover)}.nav-mobile{display:none;border-top:1px solid var(--border);padding-bottom:max(.75rem,env(safe-area-inset-bottom))}.nav-mobile ul{list-style:none;margin:0;padding:.5rem 0;display:grid;gap:.15rem}.nav-mobile .nav-link{padding:.8rem .75rem;font-size:1rem}@media(max-width:46rem){.nav-desktop{display:none}.menu-toggle{display:inline-flex}.nav-mobile.is-open{display:block}}.site-footer{margin-top:4rem;border-top:1px solid var(--border);padding-block:2rem;padding-bottom:max(2rem,env(safe-area-inset-bottom));color:var(--text-faint);font-size:.875rem}.footer-inner{display:flex;flex-wrap:wrap;gap:.5rem 1.5rem;align-items:center;justify-content:space-between}.footer-links{display:flex;flex-wrap:wrap;gap:1rem}.archive-banner{background:var(--warn-soft);border-bottom:1px solid rgba(224,163,62,.3);color:#f0cf9a;font-size:.875rem}.archive-banner-inner{display:flex;flex-wrap:wrap;gap:.35rem .75rem;align-items:center;padding-block:.6rem}.archive-banner strong{color:#f7dfb4}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.15rem 1.25rem}.card-link{display:block;color:inherit;transition:border-color .15s ease,background .15s ease}.card-link:hover{background:var(--surface-hover);border-color:var(--border-strong);color:inherit;text-decoration:none}.card-grid{display:grid;gap:var(--gap);grid-template-columns:repeat(auto-fit,minmax(min(100%,17rem),1fr))}.chip{display:inline-flex;align-items:center;gap:.35rem;min-height:2rem;padding:.25rem .7rem;border-radius:var(--radius-pill);border:1px solid var(--border-strong);background:var(--surface-high);color:var(--text);font-size:.82rem;font-weight:500;line-height:1.3}a.chip:hover{background:var(--surface-hover);border-color:var(--accent);color:var(--text);text-decoration:none}.chip svg{flex:none}.chip-accent{background:var(--accent-soft);border-color:#4b93f773;color:#a9caf9}.chip-ok{background:var(--ok-soft);border-color:#3fb27f66;color:#86d9b3}.chip-warn{background:var(--warn-soft);border-color:#e0a33e66;color:#f0cf9a}.chip-danger{background:var(--danger-soft);border-color:#e56a6366;color:#f2a9a4}.chip-quiet{background:transparent;border-color:var(--border);color:var(--text-muted)}.chip-row{display:flex;flex-wrap:wrap;gap:.4rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.45rem;min-height:2.5rem;padding:.5rem 1rem;border-radius:var(--radius-sm);border:1px solid var(--border-strong);background:var(--surface-high);color:var(--text);font-size:.92rem;font-weight:550;cursor:pointer;transition:background .15s ease,border-color .15s ease,opacity .15s ease}.btn:hover{background:var(--surface-hover);border-color:var(--accent);text-decoration:none;color:var(--text)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--accent);border-color:var(--accent);color:var(--accent-text)}.btn-primary:hover{background:var(--accent-hover);border-color:var(--accent-hover);color:var(--accent-text)}.btn-ghost{background:transparent;border-color:transparent;color:var(--text-muted)}.btn-ghost:hover{background:var(--surface-hover);color:var(--text)}.btn-danger{border-color:#e56a6380;color:#f2a9a4;background:transparent}.btn-danger:hover{background:var(--danger-soft);border-color:var(--danger);color:#f2a9a4}.btn-sm{min-height:2.15rem;padding:.35rem .7rem;font-size:.85rem}.hero{margin-bottom:3rem}.hero h1{margin-bottom:.75rem}.hero-meta{display:flex;flex-wrap:wrap;gap:.4rem .9rem;color:var(--text-muted);font-size:.95rem}.hero-meta span{display:inline-flex;align-items:center;gap:.4rem}.section-title{display:flex;align-items:center;gap:.6rem;margin-bottom:1rem}.section-title h2{font-size:1.15rem}.syllabus{list-style:none;margin:0;padding:0;display:grid;gap:.5rem}.syllabus li{position:relative;padding:.7rem 1rem .7rem 2.4rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm)}.syllabus li:before{content:counter(list-item);position:absolute;left:.85rem;top:.7rem;color:var(--accent);font-size:.8rem;font-weight:650;font-variant-numeric:tabular-nums}.prose{max-width:68ch;color:var(--text-muted)}.prose p{margin-bottom:1.1rem}.toolbar{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center;margin-bottom:1.5rem}.search{position:relative;flex:1 1 15rem;min-width:0}.search svg{position:absolute;left:.7rem;top:50%;transform:translateY(-50%);color:var(--text-faint);pointer-events:none}.search input{width:100%;min-height:2.6rem;padding:.5rem .7rem .5rem 2.3rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-size:1rem}.search input::placeholder{color:var(--text-faint)}.search input:focus{border-color:var(--accent);outline:none}.filters{display:flex;flex-wrap:wrap;gap:.4rem}.filter{cursor:pointer;background:transparent;border-color:var(--border);color:var(--text-muted)}.filter[aria-pressed=true]{background:var(--accent-soft);border-color:#4b93f780;color:#a9caf9}.lecture{display:grid;grid-template-columns:auto 1fr;gap:.35rem 1rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1rem 1.15rem;transition:border-color .15s ease}.lecture:hover{border-color:var(--border-strong)}.lecture-num{grid-row:1 / span 3;display:flex;align-items:center;justify-content:center;width:2.25rem;height:2.25rem;border-radius:var(--radius-sm);background:var(--surface-high);color:var(--text-muted);font-size:.9rem;font-weight:650;font-variant-numeric:tabular-nums}.lecture-title{font-size:1.02rem}.lecture-date{color:var(--text-faint);font-size:.82rem}.lecture .chip-row{margin-top:.35rem}@media(max-width:30rem){.lecture{grid-template-columns:1fr;gap:.5rem}.lecture-num{grid-row:auto}}.lecture-player{grid-column:2;margin-top:.6rem}.lecture-photo{grid-column:2;margin:.6rem 0 0}.lecture-photo img{display:block;max-width:100%;max-height:min(70vh,34rem);background:var(--surface-high);border:1px solid var(--border);border-radius:var(--radius)}.lecture-photo a{display:inline-block}.lecture-photo a:hover img{border-color:var(--accent)}.lecture-photo figcaption{display:flex;flex-wrap:wrap;gap:.25rem .6rem;justify-content:space-between;margin-top:.4rem;color:var(--text-faint);font-size:.82rem}@media(max-width:30rem){.lecture-player,.lecture-photo{grid-column:1}}.chip-play{cursor:pointer}.chip-play small{color:var(--text-faint);font-variant-numeric:tabular-nums}.chip-play:hover{border-color:var(--accent)}.spin{animation:spin 1.1s linear infinite}.player{position:relative;background:#000;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;outline:none;-webkit-user-select:none;user-select:none}.player:focus-visible{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-soft)}.player[data-idle]{cursor:none}.player[data-idle] .player-controls{opacity:0;transform:translateY(.6rem);pointer-events:none}.player-media{display:block;width:100%;max-height:min(70vh,34rem);background:#000}.player[data-audio]{background:var(--surface)}.player[data-audio] .player-media{display:none}.player:fullscreen{width:100vw;height:100vh;max-width:none;max-height:none;border:none;border-radius:0;box-shadow:none;background:#000}.player:-webkit-full-screen{width:100vw;height:100vh;max-width:none;max-height:none;border:none;border-radius:0;box-shadow:none;background:#000}.player:fullscreen .player-media{width:100%;height:100%;max-height:none;object-fit:contain}.player:-webkit-full-screen .player-media{width:100%;height:100%;max-height:none;object-fit:contain}.player-big{position:absolute;inset:0;margin:auto;width:4.25rem;height:4.25rem;display:grid;place-items:center;border:none;border-radius:50%;background:#0f141cb8;color:#fff;cursor:pointer;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);transition:transform .15s ease,background .15s ease}.player-big:hover{background:var(--accent);transform:scale(1.06)}.player-big svg{margin-left:.18rem}.player-spinner{position:absolute;inset:0;display:grid;place-items:center;color:#fff;pointer-events:none}.player-spinner svg{animation:spin 1.1s linear infinite}.player-resume{position:absolute;top:.6rem;left:.6rem;display:flex;align-items:center;gap:.5rem;padding:.35rem .4rem .35rem .7rem;border-radius:var(--radius-pill);background:#0f141cdb;color:#fff;font-size:.8rem;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px)}.player-resume button{border:none;background:#ffffff1f;color:#fff;border-radius:var(--radius-pill);padding:.2rem .55rem;font:inherit;cursor:pointer}.player-resume button:hover{background:var(--accent)}.player[data-audio] .player-resume{position:static;margin:.6rem .6rem 0;width:fit-content;background:var(--surface-high);color:var(--text)}.player-controls{position:absolute;left:0;right:0;bottom:0;padding:2.2rem .55rem .45rem;background:linear-gradient(to top,rgba(0,0,0,.92) 25%,rgba(0,0,0,.55) 65%,transparent);transition:opacity .2s ease,transform .2s ease}.player:not([data-audio]) .player-controls{text-shadow:0 1px 3px rgba(0,0,0,.6)}.player:not([data-audio]) .player-controls svg{filter:drop-shadow(0 1px 2px rgba(0,0,0,.55))}.player[data-audio] .player-controls{position:static;padding:.5rem .6rem .55rem;background:none}.player-bar{position:relative;height:1.1rem;display:flex;align-items:center;cursor:pointer;touch-action:none}.player-bar-track{position:relative;width:100%;height:.28rem;border-radius:var(--radius-pill);background:#ffffff38;overflow:hidden;transition:height .12s ease}.player-bar:hover .player-bar-track{height:.45rem}.player-bar-buffer,.player-bar-fill{position:absolute;inset:0 auto 0 0;border-radius:var(--radius-pill)}.player-bar-buffer{background:#ffffff47}.player-bar-fill{background:var(--accent)}.player-bar-knob{position:absolute;top:50%;width:.7rem;height:.7rem;margin-left:-.35rem;border-radius:50%;background:#fff;transform:translateY(-50%) scale(0);transition:transform .12s ease;pointer-events:none}.player-bar:hover .player-bar-knob{transform:translateY(-50%) scale(1)}.player-bar-tip{position:absolute;bottom:1.4rem;transform:translate(-50%);padding:.1rem .4rem;border-radius:var(--radius-sm);background:#0f141ceb;color:#fff;font-size:.72rem;font-variant-numeric:tabular-nums;pointer-events:none;white-space:nowrap}.player-buttons{display:flex;align-items:center;gap:.15rem;margin-top:.2rem}.player-buttons>button,.player-volume>button,.player-speed>button,.player-download{display:inline-flex;align-items:center;gap:.2rem;min-width:2rem;min-height:2rem;justify-content:center;padding:0 .3rem;border:none;border-radius:var(--radius-sm);background:none;color:#ffffffe0;cursor:pointer}.player[data-audio] .player-buttons>button,.player[data-audio] .player-volume>button,.player[data-audio] .player-speed>button,.player[data-audio] .player-download{color:var(--text-muted)}.player-buttons>button:hover,.player-volume>button:hover,.player-speed>button:hover,.player-download:hover{background:#ffffff24;color:#fff}.player[data-audio] .player-buttons>button:hover,.player[data-audio] .player-volume>button:hover,.player[data-audio] .player-speed>button:hover,.player[data-audio] .player-download:hover{background:var(--surface-hover);color:var(--text)}.player-buttons>button[data-active],.player-speed>button[data-active]{color:var(--accent-hover)}.player-speed>button small{font-size:.7rem;font-weight:600}.player-time{margin:0 .45rem 0 .3rem;color:#fff;font-size:.78rem;font-variant-numeric:tabular-nums;white-space:nowrap}.player-time span{color:#fff9}.player[data-audio] .player-time{color:var(--text)}.player[data-audio] .player-time span{color:var(--text-faint)}.player-volume{display:flex;align-items:center;margin-right:auto}.player-volume input{width:4.5rem;height:.25rem;margin:0 .4rem 0 .2rem;accent-color:var(--accent);cursor:pointer}.player-speed{position:relative}.player-menu{position:absolute;bottom:calc(100% + .35rem);right:0;z-index:5;display:grid;padding:.25rem;border-radius:var(--radius-sm);background:#141a22f7;border:1px solid var(--border-strong);box-shadow:var(--shadow)}.player-menu button{border:none;background:none;color:var(--text);font:inherit;font-size:.8rem;text-align:left;padding:.3rem .7rem;border-radius:var(--radius-sm);white-space:nowrap;cursor:pointer}.player-menu button:hover{background:var(--surface-hover)}.player-menu button[aria-checked=true]{color:var(--accent-hover);font-weight:600}.player-error{display:flex;align-items:center;gap:.8rem;padding:1rem 1.1rem;background:var(--surface);color:var(--text-muted)}.player-error svg{color:var(--warn);flex:none}.player-error strong{color:var(--text);display:block}.player-error p{font-size:.84rem;margin-top:.15rem}.player-error .btn{margin-left:auto;flex:none}@media(max-width:34rem){.player-volume input{display:none}.player-time{margin-left:.15rem;font-size:.72rem}.player-buttons>.player-download,.player-buttons>.player-pip{display:none}}.assignment{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;scroll-margin-top:calc(var(--header-h) + 1rem)}.assignment.is-open{border-color:var(--border-strong)}.assignment:target{border-color:var(--accent)}.assignment-head{display:flex;align-items:center;gap:.75rem;width:100%;padding:.9rem 1.15rem;background:none;border:0;text-align:left;cursor:pointer;color:inherit}.assignment-head:hover{background:var(--surface-hover)}.assignment-num{flex:none;display:flex;align-items:center;justify-content:center;width:2rem;height:2rem;border-radius:var(--radius-sm);background:var(--surface-high);color:var(--text-muted);font-size:.85rem;font-weight:650;font-variant-numeric:tabular-nums}.assignment-main{flex:1;min-width:0}.assignment-title{font-size:1rem;margin-bottom:.3rem}.assignment-meta{display:flex;flex-wrap:wrap;gap:.35rem .6rem;font-size:.8rem;color:var(--text-faint)}.assignment-meta span{display:inline-flex;align-items:center;gap:.3rem}.chip-status{min-height:1.6rem;padding:.1rem .55rem;font-size:.78rem}.assignment-caret{flex:none;color:var(--text-faint);transition:transform .2s ease}.assignment.is-open .assignment-caret{transform:rotate(180deg)}.assignment-body{padding:.25rem 1.15rem 1.25rem;border-top:1px solid var(--border)}.assignment-body>*+*{margin-top:1.15rem}.assignment-section h4{font-size:.82rem;text-transform:uppercase;letter-spacing:.06em;color:var(--text-faint);margin-bottom:.35rem}.assignment-section p{color:var(--text-muted)}.group-label{display:flex;align-items:center;gap:.6rem;margin:2rem 0 .85rem;color:var(--text-faint);font-size:.8rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em}.group-label:after{content:"";flex:1;height:1px;background:var(--border)}.group-label:first-child{margin-top:0}.icode{padding:.1rem .35rem;background:var(--surface-high);border:1px solid var(--border);border-radius:5px;font-size:.88em;color:#d9b3ef;overflow-wrap:anywhere}.notice{display:flex;gap:.7rem;padding:.9rem 1.1rem;background:var(--surface);border:1px solid var(--border);border-left:3px solid var(--accent);border-radius:var(--radius-sm);color:var(--text-muted)}.notice svg{flex:none;color:var(--accent);margin-top:.15rem}.notice-warn{border-left-color:var(--warn)}.notice-warn svg{color:var(--warn)}.notice-danger{border-left-color:var(--danger)}.notice-danger svg{color:var(--danger)}.empty{padding:3rem 1.5rem;text-align:center;color:var(--text-faint);background:var(--surface);border:1px dashed var(--border-strong);border-radius:var(--radius)}.empty h3{color:var(--text-muted);margin-bottom:.4rem}.empty p{margin:0 auto;max-width:40ch;font-size:.92rem}.rules{margin:0;padding-left:1.2rem;color:var(--text-muted);display:grid;gap:.5rem}.rules li{padding-left:.25rem}.loading{display:flex;align-items:center;justify-content:center;gap:.6rem;padding:4rem 1rem;color:var(--text-faint)}.spinner{width:1.1rem;height:1.1rem;border:2px solid var(--border-strong);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}