/* V16 layout layer. The mature question/simulator primitives retain their base styles. */
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h1{font-size:clamp(30px,3.5vw,48px);letter-spacing:-.045em}.eyebrow{font-size:11px;letter-spacing:.15em;color:var(--qp-muted)}.lead{max-width:65ch}.sidebar-note{background:none;border-top:1px solid var(--qp-line);border-radius:0;padding:22px 8px}.sidebar-note i{background:var(--qp-line)}.top-actions{gap:20px}.theme-button{border:0;background:none}.v-home-head{display:flex;align-items:center;justify-content:space-between;gap:40px;padding:15px 0 40px;border-bottom:1px solid var(--qp-line)}.v-home-head h1{font-size:clamp(38px,4.1vw,64px);line-height:1.02;letter-spacing:-.06em;margin:17px 0}.v-home-head p{max-width:470px;color:var(--qp-muted);line-height:1.7;font-size:15px}.v-position{display:flex;align-items:center;color:var(--qp-green);text-decoration:none;gap:16px}.v-position>strong{font-weight:500;font-size:100px;letter-spacing:-.08em}.v-position>span{font-size:12px;line-height:1.7}.v-position 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var(--qp-line);background:var(--qp-bg);color:var(--qp-muted);font:500 13px 'IBM Plex Mono',monospace;z-index:1;box-shadow:0 0 0 7px var(--qp-bg)}.v-lesson>div{min-width:0}.v-lesson strong{display:block;font-size:13px;line-height:1.4;max-width:165px;margin:2px 0}.v-lesson small,.v-lesson>div>span{font-size:10px;color:var(--qp-muted);display:block}.v-lesson.locked>div{opacity:.78}.v-lesson.current>button{background:var(--qp-green);color:var(--qp-bg);border:0;box-shadow:0 0 0 5px var(--qp-bg),0 0 0 7px var(--qp-green)}.v-lesson.current>div>span{color:var(--qp-green);font-weight:700}.v-lesson.current>button::after{content:'';position:absolute;inset:0;width:56px;height:56px;border:1px solid var(--qp-green);border-radius:50%;animation:node-awake var(--qp-celebrate) var(--qp-ease)}.v-lesson.completed>button{background:var(--qp-mint);color:var(--qp-green);border:0}.v-lesson.mastered>button{box-shadow:0 0 0 5px var(--qp-bg),0 0 0 6px var(--qp-green)}.v-lesson.checkpoint>button{border-radius:14px}.v-lesson.review>button{border-color:var(--qp-warning)}.v-lesson.challenge>button{background:var(--qp-arena);color:#e9f5ed}.v-today{position:sticky;top:92px;background:var(--qp-surface);padding:24px;border:1px solid var(--qp-line);border-radius:12px}.v-today-heading{display:flex;justify-content:space-between;font-size:11px;color:var(--qp-muted)}.v-today h2{font-size:24px;line-height:1.2;letter-spacing:-.04em;margin:25px 0 10px}.v-today>p{font-size:12px;color:var(--qp-muted);line-height:1.7}.v-today>.btn{width:100%;font-size:13px;margin:16px 0}.v-goal{display:flex;flex-wrap:wrap;justify-content:space-between;gap:9px;font-size:11px;margin:16px 0 28px}.v-goal progress{width:100%;height:5px}.v-today h3{font-size:13px}.v-quests{list-style:none;padding:0;margin:15px 0 24px}.v-quests li{display:flex;gap:10px;font-size:12px;line-height:1.7;padding:7px 0;color:var(--qp-muted)}.v-quests 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@keyframes node-awake{from{opacity:.8;transform:scale(1)}to{opacity:0;transform:scale(1.5)}}
@media(min-width:1550px){.v-learning-layout{grid-template-columns:minmax(0,1fr) 320px;gap:65px}.v-today{padding:30px}.v-lesson strong{font-size:15px;max-width:240px}.v-lesson small,.v-lesson>div>span{font-size:12px}}
@media(max-width:1150px){.sidebar{width:180px;padding:28px 14px}.workspace{margin-left:180px}.page{padding:30px 26px 65px}.v-learning-layout{gap:22px;grid-template-columns:minmax(0,1fr) 245px}.v-today{padding:20px}.v-lesson{left:30%;width:65%}.v-path-line{display:none}.v-spline::before{content:'';position:absolute;left:30%;top:50px;bottom:50px;border-left:2px solid var(--qp-line)}.v-position>strong{font-size:75px}.v-skill-group>div{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:950px){.v-learning-layout{display:flex;flex-direction:column}.v-today{position:static;order:-1;width:100%;display:grid;grid-template-columns:1fr 1fr;gap:0 24px}.v-today-heading,.v-today h2,.v-today>p,.v-today>.btn{grid-column:1}.v-today .v-goal{grid-column:2;grid-row:2}.v-today>h3,.v-today .v-quests{grid-column:2}.v-today .v-quests{grid-row:3/6;margin:0}.v-today>h3{grid-row:1}.v-today .v-review-link,.v-today-foot{grid-column:1/-1}.v-path{width:100%}.v-lesson{left:var(--node-x);width:55%}.v-path-line{display:block}.v-spline::before{display:none}.v-progress-layout{gap:25px}.v-practice-top{gap:22px}.v-smart{padding:25px}}
@media(max-width:760px){.sidebar{display:none}.workspace{margin-left:0}.topbar{height:60px;padding:0 20px;position:sticky;top:0;z-index:10}.page{padding:24px 20px 105px}.top-actions .streak-compact{font-size:11px}.bottom-nav{display:flex;justify-content:space-around;padding:10px 10px calc(10px + env(safe-area-inset-bottom));border-top:1px solid var(--qp-line);background:var(--qp-bg)}.bottom-nav a{display:flex;flex-direction:column;align-items:center;gap:5px;flex:1;font-size:10px;min-height:40px;color:var(--qp-muted)}.bottom-nav svg{width:21px;height:21px}.bottom-nav a.active{color:var(--qp-green)}.v-home-head{gap:16px;padding:5px 0 25px}.v-home-head h1{font-size:42px}.v-home-head p{font-size:13px;max-width:330px}.v-position>strong{font-size:60px}.v-position>span{display:none}.v-learning-layout{padding-top:24px}.v-today{padding:22px}.v-today h2{font-size:21px}.v-practice-top{grid-template-columns:1fr}.v-smart h2{font-size:30px}.v-builder{padding:12px 0}.v-skill-group>div{grid-template-columns:repeat(2,minmax(0,1fr));gap:0 18px}.v-skill>span{font-size:14px}.v-arena-hero{padding:32px 25px}.v-arena-hero h1{font-size:48px}.v-arena-hero>div{flex-wrap:wrap;gap:10px 20px}.v-interview-mode h2{font-size:21px}.v-progress-layout{grid-template-columns:1fr}.v-stat-strip{grid-template-columns:repeat(2,1fr);gap:25px}.v-stat strong{font-size:36px}.v-achievements{grid-template-columns:repeat(3,1fr)}.v-mistake summary{display:block}.v-mistake summary>span:last-child{display:block;margin-top:10px}.focus-bar{padding:12px 16px;gap:12px}.focus-bar .brand span{display:none}.focus-bar>div{font-size:11px}.focus-page{padding:25px 20px}.focus-page .answer-row{flex-wrap:wrap}.focus-page .answer-row input{width:100%;flex:auto}.focus-page .answer-row .btn{width:100%;min-height:48px}.v-report-table{font-size:11px}.v-report-table th,.v-report-table td{padding:12px 4px}.v-history-row{gap:10px;grid-template-columns:1fr 85px 40px 18px}.v-filter{align-items:flex-start;flex-direction:column}}
@media(max-width:430px){.v-today{display:block}.v-today .v-goal{margin:18px 0}.v-today .v-quests{margin:12px 0}.v-today>h3{margin-top:20px}.v-lesson{left:28px;width:calc(100% - 28px)}.v-lesson strong{max-width:none;font-size:14px}.v-lesson small,.v-lesson>div>span{font-size:11px}.v-path-line{display:none}.v-spline::before{display:block;left:28px}.v-chapter summary em{display:none}.v-chapter summary strong{font-size:18px}.v-chapter>summary{gap:10px}.v-chapter-number{width:36px;height:40px}.v-chapter-tools{font-size:10px;gap:10px}.v-chapter-tools a{margin-left:0}.v-skill-group>div{grid-template-columns:1fr}.v-interview-modes{grid-template-columns:1fr}.v-home-head h1{font-size:36px}.v-position>strong{font-size:48px}.v-home-head p{font-size:12px}.v-today-heading{font-size:10px}.resume-banner{align-items:flex-start;flex-direction:column}}

@media(max-width:760px){.top-actions{display:flex!important;margin-left:auto}.top-actions .streak-compact,.top-actions .theme-button{display:none}.top-actions a.theme-button{min-height:44px;display:inline-flex;align-items:center}.v-today{padding-top:18px}.v-today h2{margin-top:18px}.v-today .v-quests{margin-bottom:16px}}

.strict-session{--muted:#b3d0bf;--faint:#b3d0bf;--text:#eef7f0;--line:#3d5b4c;--accent-strong:#baf2ce}.strict-session .focus-bar a,.strict-session .timer{color:#b3d0bf}.focus-page .question{font-family:var(--sans)}.v-lesson.motion-item{opacity:0;transition:opacity var(--qp-scene) var(--qp-ease)}.v-lesson.is-revealed{opacity:1}.v-chapter.motion-item{opacity:0;transition:opacity var(--qp-scene) var(--qp-ease)}.v-chapter.is-revealed{opacity:1}

.v-storage-status{position:fixed;bottom:16px;left:50%;transform:translateX(-50%);z-index:40;max-width:calc(100vw - 32px);width:650px;background:var(--qp-surface);color:var(--qp-error);border:1px solid currentColor;border-radius:8px;padding:14px 18px;font-size:13px;line-height:1.6}@media(max-width:760px){.v-storage-status{bottom:85px}}