.redbook-app{--rb-bg:#f5f5f7;--rb-panel:#fff;--rb-ink:#1d1d1f;--rb-muted:#6e6e73;--rb-line:#00000010;--rb-accent:#7b52cb;--rb-soft:color-mix(in srgb,var(--rb-accent) 8%,transparent);--rb-fill:#ffffff28;--rb-heavy:#ffffff50;--rb-edge:#ffffffc0;--rb-shadow:#18172a20;--bg:var(--rb-bg);--surface:var(--rb-panel);--text:var(--rb-ink);--muted:var(--rb-muted);--line:var(--rb-line);--purple:var(--rb-accent);--soft:var(--rb-soft);--sidebar-width:248px;--sidebar-space:248px;--rb-header:84px;font-optical-sizing:auto;color:var(--rb-ink);font-family:Segoe UI Variable,system-ui,sans-serif;font-size:16px;line-height:1.45}.redbook-app[data-accent=ocean]{--rb-accent:#007aff}.redbook-app[data-accent=rose]{--rb-accent:#bb354e}.redbook-app[data-accent=green]{--rb-accent:#278267}html[data-theme=dark] .redbook-app{--rb-bg:#161618;--rb-panel:#212124;--rb-ink:#f5f5f7;--rb-muted:#a1a1a8;--rb-line:#ffffff16;--rb-fill:#c9d6ff09;--rb-heavy:#10131f46;--rb-edge:#ffffff40;--rb-shadow:#00000048;--rb-soft:color-mix(in srgb,var(--rb-accent) 10%,#ffffff05)}main.redbook-app,main.redbook-app.dashboard-view,html[data-theme=dark] main.redbook-app.dashboard-view{max-width:none;box-shadow:none;height:auto;min-height:100dvh;padding:var(--rb-header) 0 0 var(--sidebar-space);background:radial-gradient(ellipse at 12% 8%,color-mix(in srgb,var(--rb-accent) 20%,transparent),transparent 36%),radial-gradient(ellipse at 92% 48%,#bb354e15,transparent 36%),radial-gradient(ellipse at 45% 90%,#6593c916,transparent 40%),var(--rb-bg);background-attachment:fixed;border:0;border-radius:0;margin:0;overflow:visible}.redbook-app.dashboard-view:before{display:none}.redbook-app .rb-page-content{min-width:0;max-width:1440px;margin:0 auto;padding:48px 48px 30px}.redbook-app h1{letter-spacing:-.045em;margin:0 0 14px;font-size:clamp(1.8rem,3.3vw,2.7rem);font-weight:650;line-height:1.12}.redbook-app h2{letter-spacing:-.025em;margin:0;font-size:1.3rem;font-weight:650;line-height:1.35}.redbook-app h3:not(.covers h3){letter-spacing:-.02em;font-size:1.02rem;font-weight:650}.redbook-app p:not(.covers p){color:var(--rb-muted);margin:10px 0 24px;font-size:1rem;line-height:1.55}.redbook-app small:not(.covers small){color:var(--rb-muted);letter-spacing:.01em;font-size:.8rem}.redbook-app .eyebrow{letter-spacing:.12em;text-transform:uppercase;color:var(--rb-muted);margin-bottom:16px;font-size:.7rem;font-weight:650}.redbook-app a:not(.covers a){color:var(--rb-accent)}main.redbook-app button:not(:where(.covers *)),.redbook-app .rb-link-button,.redbook-app :is(select,textarea,input):not(:where(.covers *,[type=checkbox],[type=range])){background:linear-gradient(135deg,#ffffff0c,transparent 45%,#ffffff08),var(--rb-fill);border:1px solid var(--rb-line);box-shadow:inset 0 1px 0 var(--rb-edge),inset 1px 0 0 #ffffff18,inset 0 -1px 0 #00000012,0 3px 12px var(--rb-shadow);-webkit-backdrop-filter:blur(5px)saturate(1.2);color:var(--rb-ink);filter:none;font-family:inherit}main.redbook-app button:not(:where(.covers *)),.redbook-app .rb-link-button{white-space:normal;touch-action:manipulation;border-radius:999px;justify-content:center;align-items:center;gap:.5rem;min-height:2.65rem;padding:.65rem 1.1rem;font-size:.9rem;font-weight:600;line-height:1.35;text-decoration:none;transition:background-color .18s cubic-bezier(.23,1,.32,1),box-shadow .18s cubic-bezier(.23,1,.32,1);display:inline-flex;transform:scale(1)}main.redbook-app button:active:not(:disabled):not(:where(.covers *)){border-color:var(--rb-accent);transform:translate(0,0);box-shadow:inset 0 1px 4px #0002}main.redbook-app button.primary:not(:where(.covers *)){background:linear-gradient(to bottom,#ffffff28,transparent 20%),var(--rb-accent);color:#fff;border-color:color-mix(in srgb,var(--rb-accent) 70%,var(--rb-edge));box-shadow:inset 0 1px 1px #ffffff80,0 4px 12px color-mix(in srgb,var(--rb-accent) 18%,transparent)}main.redbook-app button:disabled:not(:where(.covers *)){opacity:.4;cursor:default}.redbook-app :is(button,a,input,select,textarea,summary,[role=separator]):not(:where(.covers *)):focus-visible{outline:3px solid var(--rb-accent);outline-offset:4px}.redbook-app :is(input,select,textarea):not(:where(.covers *)){font:inherit;border-radius:.6rem;min-width:0;padding:.6rem .75rem}.redbook-app textarea:not(:where(.covers *)){width:100%;min-height:8rem}.redbook-app .sidebar,.redbook-app.sidebar-folded .sidebar{width:var(--sidebar-width);border:0;border-right:1px solid var(--rb-line);background:linear-gradient(140deg,#ffffff08,transparent 65%),var(--rb-heavy);-webkit-backdrop-filter:blur(9px)saturate(1.15);height:100dvh;box-shadow:inset 0 1px 0 var(--rb-edge);z-index:40;transform:translateX(calc(var(--sidebar-space) - var(--sidebar-width)));padding:28px 16px 16px;display:flex;position:fixed;top:0;bottom:0;left:0;overflow:hidden auto}.redbook-app .rb-side-brand{align-items:start;gap:8px;display:flex}.redbook-app .brand,.redbook-app.sidebar-folded .brand{min-width:0;color:var(--rb-ink);flex:1;align-items:center;gap:.65rem;padding:0;text-decoration:none;display:flex}.redbook-app .brand-mark{color:#fff;background:linear-gradient(145deg,#9168dc,#6940ba);border-radius:11px;flex-shrink:0;place-items:center;width:39px;height:39px;display:grid;box-shadow:inset 0 1px 1px #ffffff70,0 3px 8px #30204d10}.redbook-app .brand b{letter-spacing:-.025em;font-size:1rem;font-weight:700}.redbook-app .brand small{color:var(--rb-muted);margin-top:.2rem;font-size:.72rem;line-height:1.5;display:block}.redbook-app button.rb-icon-button{flex-shrink:0;width:36px;height:36px;min-height:36px;padding:7px}.redbook-app .sidebar-toggle,.redbook-app.sidebar-folded .sidebar-toggle{color:var(--rb-ink);align-self:flex-start;margin-top:2px;display:inline-flex;position:static}.redbook-app .sidebar nav,.redbook-app.sidebar-folded .sidebar nav{grid-template-columns:none;gap:.3rem;margin:29px 0 24px;display:grid}.redbook-app .sidebar nav button{text-align:left;min-height:43px;box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none;color:var(--rb-ink);background:0 0;border:1px solid #0000;border-radius:.65rem;flex-direction:row;justify-content:flex-start;gap:.7rem;margin:0;padding:.65rem .8rem;font-size:.9rem;font-weight:400;line-height:1.45;display:flex;transform:none}.redbook-app .sidebar nav button:last-child{border-top:1px solid #0000}.redbook-app .sidebar nav button.primary{color:var(--rb-accent);background:color-mix(in srgb,var(--rb-accent) 9%,var(--rb-fill));border-color:var(--rb-line);box-shadow:inset 0 1px 0 var(--rb-edge);font-weight:650}.redbook-app .nav-label,.redbook-app.sidebar-folded .nav-label{display:inline}.redbook-app .rb-count{background:var(--rb-soft);border-radius:6px;margin-left:auto;padding:2px 6px;font-size:.7rem}.redbook-app .rb-side-search{border:1px solid var(--rb-line);background:var(--rb-fill);box-shadow:inset 0 1px 0 var(--rb-edge),0 3px 12px var(--rb-shadow);color:var(--rb-muted);border-radius:.7rem;align-items:center;gap:8px;padding:10px 12px;display:flex}.redbook-app .rb-side-search input{width:100%;box-shadow:none!important;-webkit-backdrop-filter:none!important;backdrop-filter:none!important;background:0 0!important;border:0!important;padding:0!important;font-size:.9rem!important}.redbook-app .rb-side-bottom{margin-top:auto;padding-top:36px}.redbook-app .side-foot,.redbook-app.sidebar-folded .side-foot{border-top:1px solid var(--rb-line);color:var(--rb-muted);margin:0;padding:16px 0 12px;font-size:.75rem;display:block}.redbook-app .side-foot small{margin-top:4px;font-size:.7rem;display:block}.redbook-app .status-dot{background:#31b77a;border-radius:50%;width:6px;height:6px;margin-right:.4rem}.redbook-app .rb-profile{text-align:left;justify-content:flex-start;align-items:center;gap:.65rem;width:100%;display:flex;box-shadow:none!important;-webkit-backdrop-filter:none!important;backdrop-filter:none!important;background:0 0!important;border:0!important;border-radius:0!important;padding:8px 0!important}.redbook-app .rb-profile strong{font-size:.9rem;font-weight:500;display:block}.redbook-app .rb-profile small{margin-top:2px;font-size:.75rem;display:block}.redbook-app .rb-avatar{background:var(--rb-soft);width:36px;height:36px;color:var(--rb-accent);border-radius:50%;flex-shrink:0;place-items:center;display:grid}.redbook-app .rb-side-links{gap:14px;padding:12px 0 0;font-size:.7rem;display:flex}.redbook-app .rb-side-links a{color:var(--rb-muted)}.redbook-app .rb-mobile-scrim{display:none!important}.redbook-app .topbar,.redbook-app.sidebar-folded .topbar{left:var(--sidebar-space);height:var(--rb-header);-webkit-backdrop-filter:none;box-shadow:none;z-index:20;pointer-events:none;background:0 0;border:0;justify-content:space-between;align-items:center;gap:16px;padding:20px 36px;display:flex;position:fixed;top:0;right:0}.redbook-app .topbar:after{display:none}.redbook-app .topbar>div{pointer-events:auto}.redbook-app .topbar h2{letter-spacing:-.025em;font-size:1rem;font-weight:650}.redbook-app .rb-toolbar-start,.redbook-app .rb-toolbar-actions,.redbook-app .rb-actions{align-items:center;gap:.65rem;display:flex}.redbook-app .rb-sidebar-open{display:none}.redbook-app.sidebar-folded .rb-sidebar-open{display:inline-flex}.redbook-app .rb-saved{color:var(--rb-muted);white-space:nowrap;font-size:.75rem}.redbook-app .rb-toolbar-actions>.primary{min-width:155px}.redbook-app .rb-app-footer{margin:0;padding:0 48px 28px}.redbook-app .rb-app-footer p{color:var(--rb-muted);margin:0;font-size:.7rem}.redbook-app .rb-page-heading{justify-content:space-between;align-items:end;gap:24px;margin:0 0 30px;display:flex}.redbook-app .rb-page-heading p{margin-bottom:0}.redbook-app .rb-page-heading>small{white-space:nowrap;padding-bottom:4px}.redbook-app .rb-section-heading{justify-content:space-between;align-items:center;gap:15px;margin:25px 0 10px;display:flex}.redbook-app .rb-section-heading h2{font-size:1rem}.redbook-app .rb-section-heading>span{color:var(--rb-muted);font-size:.75rem}.redbook-app .card:not(.covers *),.redbook-app.dashboard-view .rb-page-content .card,.redbook-app .resume-card{background:var(--rb-panel);border:1px solid var(--rb-line);box-shadow:none;color:var(--rb-ink);border-radius:1rem;margin:20px 0;padding:24px}.redbook-app .resume-card{justify-content:space-between;align-items:center;gap:20px;margin:24px 0;padding:22px 24px;display:flex}.redbook-app .resume-card .eyebrow{margin:0 0 7px}.redbook-app .resume-card h2{margin:0;font-size:1.02rem}.redbook-app .resume-card p{margin:8px 0 0;font-size:.85rem}.redbook-app .resume-card .primary:before{content:"▶";font-size:.7rem}.redbook-app .stats-strip{box-shadow:none;background:0 0;border:0;border-radius:0;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin:27px 0;display:grid;overflow:visible}.redbook-app .stats-strip>div{background:var(--rb-panel);border:1px solid var(--rb-line);border-radius:1rem;padding:22px}.redbook-app .stats-strip strong{letter-spacing:-.04em;font-size:2.4rem;font-weight:650}.redbook-app .stats-strip span{color:var(--rb-muted);margin-top:5px;font-size:.85rem;display:block}.redbook-app .next-session h2{margin:6px 0 10px}.redbook-app .grid{gap:20px}.redbook-app .grid>.card{margin:0 0 20px}.redbook-app .grid>.card h2{margin:8px 0}.redbook-app .grid>.card p{font-size:.9rem}.redbook-app .study-art{display:none}.redbook-app .library-filters{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:18px;margin:24px 0 32px;display:flex}.redbook-app .library-filters>input{flex:1;min-width:210px;max-width:430px;min-height:43px}.redbook-app .segmented{border:1px solid var(--rb-line);background:linear-gradient(135deg,#ffffff0c,transparent 45%,#ffffff08),var(--rb-fill);width:max-content;box-shadow:inset 0 1px 0 var(--rb-edge),0 3px 12px var(--rb-shadow);-webkit-backdrop-filter:blur(5px)saturate(1.2);backdrop-filter:blur(5px)saturate(1.2);border-radius:999px;gap:.2rem;padding:.25rem;display:flex}.redbook-app .segmented button{box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none;background:0 0;border:1px solid #0000;border-radius:999px;min-height:34px;padding:.45rem .9rem;font-size:.85rem;font-weight:400}.redbook-app .segmented button[aria-pressed=true]{background:var(--rb-heavy);border-color:var(--rb-line);box-shadow:inset 0 1px 1px var(--rb-edge),0 3px 10px var(--rb-shadow);color:var(--rb-ink)}.redbook-app .covers{--bg:#f7f8fd;--surface:#fff;--text:#13152d;--muted:#737b9b;--line:#e9eaf4;--purple:#7950d4;--soft:#f1edff;font-family:Inter,Arial,sans-serif;font-size:16px;line-height:1.5}html[data-theme=dark] .redbook-app .covers{--bg:#161526;--surface:#211f32;--text:#eeedf8;--muted:#aaa6c3;--line:#ffffff16;--soft:#3b2c55}.redbook-app .filter{align-items:center;gap:.75rem;margin:22px 0;font-size:.85rem;display:flex}.redbook-app .filter select{min-width:220px}.redbook-app .notebook-overview{border:1px solid var(--rb-line);background:var(--rb-panel);border-radius:1rem;justify-content:space-between;align-items:center;margin:24px 0;padding:20px 24px;display:flex}.redbook-app .notebook-overview strong{font-size:1rem;font-weight:650}.redbook-app .notebook-overview span{color:var(--rb-muted);font-size:.85rem}.redbook-app .mistake-detail{margin:12px 0;padding:20px 24px}.redbook-app .mistake-detail summary{row-gap:7px;min-height:45px}.redbook-app .mistake-detail h2{font-size:1rem;font-weight:600}.redbook-app .mistake-detail .eyebrow{letter-spacing:0;text-transform:none;color:var(--rb-muted);margin:0;font-size:.75rem}.redbook-app .material-status{color:var(--rb-accent);font-size:.75rem}.redbook-app .expand-hint{font-size:.75rem}.redbook-app .mistake-body{gap:20px;margin-top:20px;padding-top:22px}.redbook-app .mistake-body p{font-size:.9rem}.redbook-app .mistake-body label{gap:10px;font-size:.85rem}.redbook-app[data-view=Planner] .card{flex-wrap:wrap;align-items:center;gap:25px;display:flex}.redbook-app[data-view=Planner] .card>strong{flex:1;font-size:1rem}.redbook-app[data-view=Planner] .card>label{align-items:center;gap:12px;font-size:.85rem;display:flex}.redbook-app[data-view=Progress] .card p{font-size:.85rem}.redbook-app progress{appearance:none;width:100%;height:.3rem;accent-color:var(--rb-accent);background:var(--rb-line);border:0;border-radius:1rem;margin:18px 0 0}.redbook-app progress::-webkit-progress-bar{background:var(--rb-line)}.redbook-app progress::-webkit-progress-value{background:var(--rb-accent);border-radius:1rem}.redbook-app .rb-settings-grid{grid-template-columns:repeat(2,minmax(0,1fr));align-items:start;gap:22px;margin-top:32px;display:grid}.redbook-app .rb-settings-grid>.settings-panel{max-width:none;margin:0;padding:0;display:block;overflow:hidden}.redbook-app .settings-panel>h2{border-bottom:1px solid var(--rb-line);margin:0;padding:20px 21px;font-size:1rem}.redbook-app .settings-panel>label{border-bottom:1px solid var(--rb-line);justify-content:space-between;align-items:center;gap:16px;min-height:72px;margin:0;padding:16px 21px;font-size:.9rem;line-height:1.45;display:flex}.redbook-app .settings-panel>label:last-child{border:0}.redbook-app .settings-panel label>span{min-width:0}.redbook-app .settings-panel label small{max-width:270px;margin-top:5px;font-size:.8rem;line-height:1.5;display:block}.redbook-app .settings-panel select{cursor:pointer;flex-shrink:0;min-width:0;max-width:180px;padding:.6rem .75rem;font-size:.9rem}.redbook-app .rb-group-body{gap:16px;padding:21px;font-size:.9rem;display:grid}.redbook-app .rb-group-body>p{margin:0;font-size:.9rem}.redbook-app .rb-group-body>a{font-size:.8rem}.redbook-app .rb-group-body>.primary{justify-self:start}.redbook-app .rb-range{align-items:center;gap:8px;display:flex}.redbook-app .rb-range small{white-space:nowrap}.redbook-app input[type=range]{appearance:none;border:1px solid var(--rb-line);background:linear-gradient(90deg,color-mix(in srgb,var(--rb-accent) 60%,var(--rb-fill)),var(--rb-fill));cursor:pointer;border-radius:999px;width:115px;max-width:100%;height:.55rem;padding:0;box-shadow:inset 0 1px 3px #00000016}.redbook-app input[type=range]::-webkit-slider-thumb{appearance:none;border:1px solid var(--rb-edge);background:linear-gradient(145deg,#ffffffd9,var(--rb-fill));border-radius:50%;width:1.45rem;height:1.45rem;box-shadow:inset 0 1px 1px #fff,0 2px 6px #0003}.redbook-app .settings-panel input[type=checkbox]{appearance:none;border:1px solid var(--rb-line);background:var(--rb-fill);cursor:pointer;border-radius:999px;flex-shrink:0;width:2.7rem;height:1.6rem;margin:0;padding:0;position:relative;box-shadow:inset 0 1px 3px #0002}.redbook-app .settings-panel input[type=checkbox]:after{content:"";background:linear-gradient(145deg,#fff,#dddded);border-radius:50%;width:1.2rem;height:1.2rem;transition:transform .18s cubic-bezier(.23,1,.32,1);position:absolute;top:.15rem;left:.15rem;box-shadow:0 2px 4px #0002}.redbook-app .settings-panel input[type=checkbox]:checked{background:var(--rb-accent)}.redbook-app .settings-panel input[type=checkbox]:checked:after{transform:translate(1.05rem)}main.redbook-app.player-view{background:var(--rb-bg);height:100dvh;min-height:100dvh;margin:0;padding:0;display:block;overflow:hidden}.redbook-app.player-view>.sidebar,.redbook-app.player-view>.topbar,.redbook-app.player-view>.rb-mobile-scrim,.redbook-app.player-view>.rb-app-footer{display:none!important}.redbook-app.player-view>.rb-page-content{max-width:none;height:100%;min-height:0;padding:0}.redbook-app .practice-workspace-root{background:0 0;flex-direction:column;height:100%;min-height:0;display:flex}.redbook-app .practice-header-bar,.redbook-app .practice-footer-bar{background:linear-gradient(135deg,#ffffff0c,transparent 65%),var(--rb-fill);-webkit-backdrop-filter:blur(6px)saturate(1.3);box-shadow:inset 0 1px 0 var(--rb-edge);border-color:var(--rb-line)}.redbook-app .practice-header-bar{z-index:30;flex-shrink:0;grid-template-columns:1fr minmax(0,1.2fr) 1fr;gap:16px;min-height:86px;padding:20px 32px;display:grid;position:relative}.redbook-app .practice-header-bar:after{content:"";background:linear-gradient(var(--rb-shadow),transparent);pointer-events:none;opacity:.25;height:10px;position:absolute;bottom:-10px;left:0;right:0}.redbook-app .header-left,.redbook-app .header-right{align-items:center;gap:10px;display:flex}.redbook-app .header-right{justify-content:flex-end}.redbook-app .header-center{text-align:center;min-width:0}.redbook-app .skill-title-cluster{gap:5px;display:grid}.redbook-app .skill-main-name{letter-spacing:-.02em;white-space:normal;color:var(--rb-ink);font-size:1rem;font-weight:650}.redbook-app .skill-meta-tags{display:block}.redbook-app .meta-pill.section-pill{color:var(--rb-muted);letter-spacing:0;background:0 0;border:0;padding:0;font-size:.8rem;font-weight:400}.redbook-app .timer-wrapper{align-items:center;gap:10px;display:flex}.redbook-app .digital-timer-pill{background:var(--rb-soft);font-variant-numeric:tabular-nums;min-width:0;color:var(--rb-ink);box-shadow:none;border:0;border-radius:.65rem;gap:8px;padding:.45rem .8rem;font-size:1rem;font-weight:650;display:flex}.redbook-app .timer-icon{display:none}.redbook-app .header-tool-btn{white-space:nowrap!important;padding:.65rem .9rem!important;font-size:.8rem!important}.redbook-app .back-library-btn{font-size:.9rem!important}.redbook-app .header-dropdown-menu{background:var(--rb-heavy);border:1px solid var(--rb-line);box-shadow:inset 0 1px 1px var(--rb-edge),0 15px 50px #0002;-webkit-backdrop-filter:blur(8px)saturate(1.25);backdrop-filter:blur(8px)saturate(1.25);color:var(--rb-ink);transform-origin:100% 0;border-radius:1rem;min-width:220px;padding:8px}.redbook-app .header-dropdown-menu 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