.v2-h{margin:0;font-weight:700}.v2-hint{color:var(--ink-2);margin:0;font-size:14px;line-height:1.45}.v2-label{color:var(--ink-2);letter-spacing:.04em;text-transform:uppercase;margin:0;font-size:12px;font-weight:600}.v2-muted{color:var(--ink-2)}.v2-chips{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.ob-reading.is-v2{text-align:left;gap:18px;display:grid}.v2-reading{border:1px solid var(--line);background:var(--surface);border-radius:18px;gap:12px;padding:18px 20px;display:grid}.v2-reading-title{margin:0;font-weight:700}.v2-checks{gap:8px;margin:0;padding:0;list-style:none;display:grid}.v2-check{min-height:24px;color:var(--ink-2);align-items:center;gap:10px;font-size:15px;transition:color .4s;display:flex}.v2-check.is-done,.v2-check.is-busy{color:var(--ink)}.v2-check-mark{border:1.5px solid var(--line-strong,var(--line));border-radius:50%;flex:0 0 22px;place-items:center;width:22px;height:22px;transition:background .4s,border-color .4s;display:grid}.v2-check.is-done .v2-check-mark{border-color:var(--ink);background:var(--ink);color:var(--bg)}.v2-check.is-busy .v2-check-mark{border-color:var(--accent-ink,var(--ink))}.v2-check.is-busy .v2-check-mark i{background:var(--accent);border-radius:50%;width:8px;height:8px;animation:1.4s ease-in-out infinite v2-pulse}@keyframes v2-pulse{50%{opacity:.6;transform:scale(.55)}}.v2-line{background:var(--line);border-radius:3px;height:3px;position:relative;overflow:hidden}.v2-line i{transform-origin:0;background:var(--accent);transition:transform .8s;position:absolute;inset:0;transform:scaleX(.02)}.v2-line.is-endless i{width:28%;animation:1.8s ease-in-out infinite v2-slide;transform:none}@keyframes v2-slide{0%{transform:translate(-100%)}to{transform:translate(360%)}}.v2-reading-note{height:2.9em;color:var(--ink-2);-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;margin:0;font-size:13.5px;line-height:1.45;display:-webkit-box;overflow:hidden}.v2-chapters{gap:10px;margin-top:8px;display:grid}.v2-chapters-head{gap:4px;display:grid}.v2-pages-note{background:var(--accent-soft);border-radius:10px;padding:8px 12px}.v2-chapters-tools{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.v2-chapters-tools input{border:1px solid var(--line-strong,var(--line));background:var(--surface);min-width:0;font:inherit;border-radius:999px;flex:200px;padding:8px 12px;font-size:14px}.v2-chapters-tools button{border:1px solid var(--line);background:var(--surface);color:var(--ink);font:inherit;cursor:pointer;border-radius:999px;padding:6px 12px;font-size:13px}.v2-chapter-list{grid-template-columns:minmax(0,1fr);gap:2px;margin:0;padding:0;list-style:none;display:grid;overflow-x:hidden}.v2-chapter-list.is-scroll{overscroll-behavior:contain;max-height:440px;padding-right:4px;overflow:auto}.v2-part{align-items:center;gap:10px;margin-top:10px;padding:6px 8px;font-size:14px;display:flex}.v2-part b{text-overflow:ellipsis;white-space:nowrap;min-width:0;overflow:hidden}.v2-part small{color:var(--ink-2);flex:none;margin-left:auto}.v2-chapter{cursor:pointer;border-radius:10px;grid-template-columns:20px minmax(0,1fr) minmax(60px,28%) 58px;align-items:center;gap:10px;padding:7px 8px;transition:background .2s;display:grid}.v2-chapter:hover{background:var(--accent-soft)}.v2-chapter-title{-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;font-size:14.5px;line-height:1.35;display:-webkit-box;overflow:hidden}.v2-chapter:not(.is-on) .v2-chapter-title{color:var(--ink-2)}.v2-chapter-weight{background:var(--line);border-radius:8px;height:8px;position:relative;overflow:hidden}.v2-chapter-weight i{transform-origin:0;background:var(--ink-3,var(--ink-2));border-radius:8px;transition:transform .4s,background .3s;position:absolute;inset:0}.v2-chapter.is-on .v2-chapter-weight i{background:var(--ink)}.v2-chapter small{color:var(--ink-2);text-align:right;font-variant-numeric:tabular-nums;font-size:12.5px}.v2-none{color:var(--ink-2);padding:12px 8px}.v2-chapters-total{border:1px solid var(--accent);background:var(--accent-soft);font-variant-numeric:tabular-nums;border-radius:14px;flex-wrap:wrap;align-items:center;gap:6px 16px;min-height:48px;margin:0;padding:10px 14px;display:flex}.v2-chapters-total span{color:var(--ink-2)}.v2-chapters-total.is-empty span{color:var(--ink);font-weight:600}@media (max-width:640px){.v2-chapter{grid-template-columns:20px minmax(0,1fr) 48px}.v2-chapter-weight{grid-area:2/2/auto/4}}.v2-depth{grid-template-columns:minmax(240px,.85fr) minmax(0,1.4fr);align-items:start;gap:20px;display:grid}.v2-depth-levels{gap:6px;display:grid}.v2-level{border:1px solid var(--line);background:var(--surface);color:var(--ink);font:inherit;text-align:left;cursor:pointer;border-radius:14px;gap:5px;padding:10px 12px;transition:border-color .25s,background .25s,box-shadow .25s;display:grid}.v2-level:hover{border-color:var(--line-strong,var(--ink-3))}.v2-level.is-on{border-color:var(--ink);box-shadow:inset 0 0 0 1px var(--ink)}.v2-level-name{align-items:center;gap:8px;font-size:14.5px;font-weight:600;display:flex}.v2-level-name i{background:var(--line);border-radius:50%;flex:none;place-items:center;width:22px;height:22px;font-size:12px;font-style:normal;transition:background .25s;display:grid}.v2-level.is-on .v2-level-name i{background:var(--accent);color:var(--accent-ink,var(--ink))}.v2-level-bar{background:var(--line);border-radius:6px;height:6px;position:relative;overflow:hidden}.v2-level-bar i{transform-origin:0;background:var(--ink-3,var(--ink-2));border-radius:6px;transition:transform .5s,background .25s;position:absolute;inset:0}.v2-level.is-on .v2-level-bar i{background:var(--accent)}.v2-level small{min-height:1.3em;color:var(--ink-2);font-variant-numeric:tabular-nums;font-size:12.5px}.v2-depth-papers{gap:10px;display:grid}.v2-depth-summary{min-height:2.9em;color:var(--ink-2);-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;margin:0;font-size:14px;line-height:1.45;display:-webkit-box;overflow:hidden}.v2-paper{border:1px solid var(--line);background:var(--bg);border-radius:16px;gap:6px;margin:0;padding:14px 16px;display:grid}.v2-paper.is-lecture{background:var(--surface)}.v2-paper figcaption{color:var(--ink-2);letter-spacing:.04em;text-transform:uppercase;justify-content:space-between;gap:8px;font-size:12px;font-weight:600;display:flex}.v2-paper figcaption span{color:var(--ink);letter-spacing:0;text-transform:none}.v2-paper p{font-family:var(--font-read,var(--font-ui));margin:0;font-size:16px;line-height:1.6}.v2-paper p.ob-mock{font:500 13px/18px var(--font-ui);margin-bottom:8px}.v2-paper-body{height:12.8em;overflow:auto}.v2-fade{animation:.45s v2-fade}@keyframes v2-fade{0%{opacity:0}to{opacity:1}}@media (max-width:820px){.v2-depth{grid-template-columns:minmax(0,1fr)}}.v2-told{grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);align-items:start;gap:18px 24px;margin-bottom:28px;display:grid}.v2-live{animation:.5s v2-fade}.v2-live .ob-player{max-width:none}.v2-live .ob-player-bubble{align-content:end;min-height:6.4em}.v2-live .ob-player-prev{white-space:normal;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;display:-webkit-box;overflow:hidden}.v2-live .ob-player-cur{-webkit-line-clamp:3;line-clamp:3;-webkit-box-orient:vertical;display:-webkit-box;overflow:hidden}.v2-live.is-none{border:1px dashed var(--line-strong,var(--line));background:var(--bg);min-height:240px;color:var(--ink-2);text-align:center;border-radius:16px;place-items:center;padding:20px;display:grid}.v2-told-controls{grid-template-columns:minmax(0,1fr);align-content:start;gap:8px;display:grid}.v2-told-controls .v2-label:not(:first-child){margin-top:10px}.v2-seg{background:var(--surface-2);border-radius:999px;grid-auto-columns:auto;grid-auto-flow:column;justify-self:start;gap:2px;max-width:100%;padding:3px;display:inline-grid}.v2-seg button{color:var(--ink-2);font:inherit;white-space:nowrap;cursor:pointer;background:0 0;border:0;border-radius:999px;padding:7px 14px;font-size:14px;font-weight:600;transition:background .2s,color .2s}.v2-seg button:hover{color:var(--ink)}.v2-seg button.is-on{background:var(--accent);color:var(--accent-ink,var(--ink));box-shadow:var(--shadow-button)}.v2-voice-now.ob-voice{border:1px solid var(--line);background:var(--surface);border-radius:16px;flex-wrap:wrap;align-items:center;gap:8px 12px;min-height:58px;padding:8px 8px 8px 12px;display:flex}.v2-voice-now .ob-listen{flex:none;margin:0;position:static}.v2-voice-now p{flex:110px;min-width:0;margin:0;display:grid}.v2-voice-now p strong{font-weight:600}.v2-voice-now p span{color:var(--ink-2);font-size:13px}.v2-voice-now .btn{flex:none}@media (max-width:820px){.v2-told{grid-template-columns:minmax(0,1fr)}}@media (max-width:420px){.v2-voice-now.ob-voice{flex-wrap:wrap}.v2-voice-now .btn{flex:100%}}.v2-chat-wrap{gap:12px;display:grid}.v2-yours{gap:16px;display:grid}.v2-yours-tabs{margin-bottom:2px}.v2-chat{flex-direction:column;gap:10px;display:flex}.v2-bubble{background:var(--surface-2);border:0;border-radius:18px 18px 18px 6px;gap:4px;max-width:min(560px,88%);margin:0;padding:10px 14px;line-height:1.45;animation:.35s v2-fade;display:grid}.v2-bubble small{color:var(--ink-2);font-size:12.5px}.v2-bubble.is-me{background:var(--ink);color:var(--bg);border-radius:18px 18px 6px;align-self:flex-end}.v2-example{color:var(--ink);font:inherit;text-align:left;cursor:pointer;border:2px solid #0000;transition:border-color .2s,background .2s,opacity .2s}.v2-example b{color:var(--ink-2);letter-spacing:.04em;text-transform:uppercase;font-size:12px;font-weight:700}.v2-example:not(:disabled):hover{border-color:var(--accent)}.v2-example:focus-visible{outline:3px solid var(--accent);outline-offset:2px}.v2-example:disabled{cursor:default}.v2-example.is-picked{border-color:var(--accent);background:var(--accent-soft)}.v2-example.is-dim{opacity:.55}.v2-bubble.is-me.is-muted{background:var(--line);color:var(--ink-2)}.v2-bubble.is-typing{min-height:44px}.v2-say{align-items:flex-end;gap:8px;display:flex}.v2-say textarea{border:1px solid var(--line-strong,var(--line));background:var(--surface);min-width:0;color:var(--ink);font:inherit;resize:none;border-radius:20px;flex:auto;padding:9px 16px;font-size:15px;line-height:22px;display:block;overflow-y:hidden}.v2-say textarea:focus-visible{outline:3px solid var(--accent);outline-offset:2px}.v2-skip{justify-self:start;font-size:14px}.v2-skips{flex-wrap:wrap;gap:6px 18px;margin:0;display:flex}.v2-price{gap:12px;transition:opacity .2s;display:grid}.v2-price.is-updating{opacity:.7}.v2-receipt{border:1px solid var(--line);background:var(--surface);border-radius:18px;margin:0;padding:6px 18px;list-style:none;display:grid}.v2-receipt li{border-bottom:1px dashed var(--line);font-variant-numeric:tabular-nums;justify-content:space-between;align-items:center;gap:12px;min-height:48px;transition:color .25s;display:flex}.v2-receipt li:last-child{border-bottom:0}.v2-receipt li.is-off b{color:var(--ink-3,var(--ink-2));text-decoration:line-through}.v2-receipt li b{flex:none;font-weight:600}.v2-fixed{padding-left:46px}.v2-included{color:var(--ink-2);font-weight:500!important}.v2-promo span{background:var(--accent);width:fit-content;color:var(--accent-ink,var(--ink));border-radius:6px;padding:0 .4em;font-weight:600}.v2-custom-line{border-radius:12px;margin:0 -12px;padding:0 12px;transition:background .3s}.v2-custom-line.is-on{background:var(--accent-soft)}.v2-custom-what{flex-wrap:wrap;align-items:center;gap:2px 12px;min-width:0;display:flex}.v2-custom-what .ob-link{font-size:14px}.v2-custom-line{scroll-margin:120px 0}.v2-custom-line:target{animation:1.6s .2s v2-here}@keyframes v2-here{30%{background:var(--accent)}}.v2-total{font-size:18px;min-height:56px!important}.v2-total span{font-weight:700}.v2-total b{align-items:baseline;gap:10px;font-size:22px;display:flex}.v2-total s{color:var(--ink-3,var(--ink-2));font-size:15px;font-weight:500}.v2-note{background:var(--accent-soft);border-radius:14px;margin:0;padding:12px 14px;font-size:14px;line-height:1.5}.ob-custom.is-confirm-only{margin-top:0}.v2-switch{cursor:pointer;align-items:center;gap:12px;min-width:0;display:flex}.v2-switch input{opacity:0;width:1px;height:1px;position:absolute}.v2-switch i{background:var(--line-strong,#d9d2c3);border-radius:20px;flex:none;width:34px;height:20px;transition:background .25s;position:relative}.v2-switch i:after{content:"";background:#fff;border-radius:50%;width:16px;height:16px;transition:transform .25s;position:absolute;top:2px;left:2px;box-shadow:0 1px 2px #0003}.v2-switch input:checked+i{background:var(--ink)}.v2-switch input:checked+i:after{transform:translate(14px)}.v2-switch input:focus-visible+i{outline:2px solid var(--accent);outline-offset:2px}.v2-switch.is-disabled{cursor:default;opacity:.55}.v2-switch span{min-width:0}@media (prefers-reduced-motion:reduce){.v2-line.is-endless i,.v2-check.is-busy .v2-check-mark i,.v2-fade,.v2-live,.v2-bubble{animation:none}}.ob-reading .v2-reading{text-align:left}.ob-reading .v2-reading .v2-reading-title{color:var(--ink);margin:0;font-size:15px;font-weight:700}.ob-reading .v2-reading .v2-reading-note{margin:0;font-size:13.5px}.ob-manner-pick{border:1px solid var(--line);background:var(--surface);border-radius:16px;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px 16px;padding:14px 16px;display:flex}.ob-manner-pick p{flex:260px;gap:2px;min-width:0;margin:0;display:grid}.ob-manner-pick strong{font-weight:600}.ob-manner-pick span{color:var(--ink-2);font-size:14px;line-height:1.45}.ob-manner-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;display:grid}.ob-manner-option{border-radius:12px;grid-template-columns:clamp(96px,11vw,140px) minmax(0,1fr);align-items:center;column-gap:16px;padding:8px 16px 8px 10px;display:grid}.ob-manner-option strong{grid-column:2;align-self:end;font-size:15px;line-height:20px}.ob-manner-option span:not(.ob-option-check):not(.ob-badge){grid-column:2;align-self:start;font-size:13.5px;line-height:19px}.ob-manner-option .ob-manner-pic{object-fit:contain;object-position:center bottom;grid-area:1/1/span 2;width:100%;height:clamp(76px,23vh - 88.5px,180px);margin:0;display:block}.ob-manner-pick .ob-manner-pic{object-fit:contain;object-position:center bottom;flex:none;width:80px;height:120px}@media (max-width:860px){.ob-manner-grid{grid-template-columns:minmax(0,1fr)}.ob-manner-option .ob-manner-pic{height:96px}}.ob-manner-now .ob-manner-example{margin-top:10px}.ob-modal-body .ob-manner-example{margin-top:12px}.ob-modal-body:has(.ob-manner-grid){padding:14px 18px 16px}.ob-modal-box:has(.ob-manner-grid){width:min(1040px,100%)}.ob-modal-box:has(.ob-manner-grid) header{padding:12px 20px}.ob-fixed{background:var(--surface-2);border-radius:16px;gap:2px;margin:0;padding:14px 16px;display:grid}.ob-fixed strong{font-weight:600}.ob-fixed span{color:var(--ink-2);font-size:14px;line-height:1.45}.ob-aids{gap:10px;margin:0;padding:0;list-style:none;display:grid}.ob-aids li{border:1px solid var(--line-strong);background:var(--surface);border-radius:16px;transition:border-color .15s}.ob-aids li.is-on{border-color:var(--accent)}.ob-aid{cursor:pointer;grid-template-columns:auto minmax(0,1fr);align-items:start;gap:14px;padding:14px 16px 12px;display:grid}.ob-aid-switch{padding-top:1px}.ob-aid-text{gap:2px;min-width:0;display:grid}.ob-aid-text strong{font:600 15.5px/21px var(--font-ui)}.ob-aid-text span{color:var(--ink-2);font-size:14px;line-height:20px}.ob-aid-preview{background:var(--bg);border-radius:12px;margin:0 12px 12px;padding:12px 14px;display:block}.ob-aid-preview .r2s-q,.ob-aid-preview .r2s-problem,.ob-aid-preview .r2s-hint,.ob-aid-preview .r2s-source blockquote{font-size:14px;line-height:20px}.ob-aid-preview :is(h3,h4,.r2s-title){font-size:14px;line-height:19px}.ob-aid-preview .r2s-q{margin-bottom:8px!important}.ob-aid-preview .r2s-dots{transform-origin:0;margin-bottom:6px;transform:scale(.75)}.ob-aid-preview .r2s-options{flex-wrap:wrap;gap:6px;display:flex}.ob-aid-preview .r2s-options button{gap:7px;width:auto;padding:4px 10px 4px 5px;font-size:13px;line-height:18px}.ob-aid-preview .r2s-key{width:18px;height:18px;font-size:10.5px}.ob-aids-note{margin-top:10px}.ob-layout :is(.ob-option,.chip,.btn-secondary,.ob-formats label,.ob-mic,.ob-preview-close){border:1px solid var(--line-strong);box-shadow:none}.ob-layout :is(.chip,.ob-option):hover{transform:none}.ob-layout :is(.chip,.btn-secondary,.ob-option:not(:disabled,.is-selected),.ob-formats label):hover{border-color:var(--ink-2)}.ob-layout :is(.ob-option.is-selected,.chip.is-active,.ob-formats label:has(input:checked)){border-color:var(--accent)}.ob-layout .v2-seg button.is-on{box-shadow:none}.ob-lineup{border-bottom:2px solid var(--ink);background:var(--surface);border-radius:12px 12px 0 0;grid-template-columns:repeat(8,minmax(0,1fr));align-items:end;padding:14px 6px 0;display:grid}.ob-lineup button{min-width:0;color:var(--ink-2);cursor:pointer;background:0 0;border:0;justify-items:center;gap:6px;padding:0 0 8px;display:grid;position:relative}.ob-lineup img{z-index:1;object-fit:contain;object-position:center bottom;width:100%;height:clamp(110px,16vw,170px);transition:transform .2s;display:block;position:relative}.ob-lineup button.is-on img{background:radial-gradient(ellipse 46% 8px at 50% calc(100% - 5px), var(--accent) 97%, transparent 100%)}.ob-lineup button:hover img,.ob-lineup button.is-on img{transform:translateY(-5px)}.ob-lineup span{min-height:32px;font:500 12px/16px var(--font-ui);text-align:center;text-wrap:balance}.ob-lineup button.is-on span{color:var(--ink);font-weight:700}.ob-lineup button:focus-visible{outline:2px solid var(--ink);outline-offset:-2px;border-radius:8px}.ob-lineup-under{grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);align-items:start;gap:18px;padding-top:14px;display:grid}.ob-lineup-under h4{font:700 18px/24px var(--font-ui);margin:0 0 4px}.ob-lineup-under p{color:var(--ink-2);margin:0;font-size:14.5px;line-height:21px}.ob-lineup-under .ob-manner-example{margin:0}@media (max-width:720px){.ob-lineup{grid-template-columns:repeat(4,minmax(0,1fr));row-gap:10px}.ob-lineup img{height:120px}.ob-lineup-under{grid-template-columns:minmax(0,1fr)}}.v2-exam{gap:12px;margin-top:8px;display:grid}.v2-exam-topics{gap:10px;margin:0;padding:0;list-style:none;display:grid}.v2-exam-topic{border-left:4px solid var(--accent);background:var(--surface-2);border-radius:0 12px 12px 0;gap:6px;padding:12px 14px;display:grid}.v2-exam-topic-head{align-items:center;gap:10px;display:flex}.v2-exam-n{color:var(--ink-2);font:600 12px var(--font-ui);text-transform:uppercase;letter-spacing:.04em;flex:none}.v2-exam-topic input{min-width:0;color:var(--ink);font:400 14px/1.4 var(--font-ui);background:0 0;border:1px solid #0000;border-radius:8px;flex:1;padding:6px 8px}.v2-exam-topic input:hover,.v2-exam-topic input:focus{border-color:var(--line-strong);background:var(--surface);outline:none}.v2-exam-topic .v2-exam-title{font-weight:700}.v2-exam-topic ul{gap:2px;margin:0;padding:0 0 0 18px;list-style:outside;display:grid}.v2-exam-topic ul li{display:list-item}.v2-exam-topic ul li>*{vertical-align:middle}.v2-exam-topic ul input{width:calc(100% - 34px)}.v2-exam-x{width:26px;height:26px;color:var(--ink-3);font:400 18px/1 var(--font-ui);cursor:pointer;background:0 0;border:0;border-radius:999px}.v2-exam-x:hover:not(:disabled){background:var(--surface);color:var(--ink)}.v2-exam-x:disabled{visibility:hidden}.v2-exam-topic>.ob-link{justify-self:start;margin-left:18px}.v2-exam-foot{color:var(--ink-2);flex-wrap:wrap;justify-content:space-between;gap:8px;display:flex}.ob-aid-tiles{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:0;padding:0;list-style:none;display:grid}.ob-aid-tile{border:1px solid var(--line-strong);background:var(--surface);cursor:pointer;border-radius:12px;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:10px;height:100%;padding:10px 12px;transition:border-color .15s;display:grid}.ob-aid-tile:hover{border-color:var(--ink-2)}.ob-aid-tile.is-on{border-color:var(--accent)}.ob-aid-tile strong{font:600 14px/18px var(--font-ui)}.ob-aid-icon{flex:none;width:36px;height:36px}.ob-aid-more{gap:20px;display:grid}.ob-aid-more section{gap:6px;display:grid}.ob-aid-more h4{font:700 16px/22px var(--font-ui);align-items:center;gap:10px;margin:0;display:flex}.ob-aid-more h4 .ob-aid-icon{width:28px;height:28px}.ob-aid-more .ob-aid-preview{margin:4px 0 0}@media (max-width:720px){.ob-aid-tiles{grid-template-columns:minmax(0,1fr)}}.ob-aid-icon.is-drawn{width:44px;height:44px}.ob-aid-words{gap:3px;min-width:0;display:grid}.ob-aid-words small{color:var(--ink-2);font:400 12.5px/1.35 var(--font-ui)}.ob-aid-tile{align-items:start}.ob-aid-tile .v2-switch{margin-top:2px}