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24px 64px #00000059}.personalize-modal-header{border-bottom:1px solid var(--line);background:var(--paper);justify-content:space-between;align-items:flex-start;gap:1rem;padding:1.25rem 1.5rem;display:flex}.personalize-modal-header__title{align-items:flex-start;gap:.75rem;display:flex}.personalize-modal-icon{font-size:1.8rem;line-height:1}.personalize-modal-header h2{color:var(--ink);margin:0;font-size:1.2rem}.personalize-modal-header p{color:var(--ink-soft);margin:.25rem 0 0;font-size:.84rem;line-height:1.4}.personalize-modal-close{border:1px solid var(--line);background:var(--paper-card);width:32px;height:32px;color:var(--ink-faint);cursor:pointer;border-radius:50%;flex-shrink:0;place-items:center;font-size:1.1rem;line-height:1;transition:all .15s;display:grid}.personalize-modal-close:hover{border-color:var(--teal);color:var(--ink)}.personalize-modal-form{flex-direction:column;gap:1.25rem;padding:1.5rem;display:flex}.personalize-form-section{flex-direction:column;gap:.5rem;display:flex}.personalize-label{font-family:var(--font-mono);text-transform:uppercase;letter-spacing:.05em;color:var(--teal-deep);font-size:.74rem;font-weight:700}.personalize-name-grid{grid-template-columns:1fr 1fr;gap:.75rem;display:grid}.personalize-name-grid input,.personalize-select{border:1.5px solid var(--line);background:var(--paper);width:100%;color:var(--ink);font-family:var(--font-body);border-radius:8px;padding:.7rem .85rem;font-size:.92rem;transition:border-color .15s}.personalize-name-grid input:focus,.personalize-select:focus{border-color:var(--teal);background:var(--paper-card);outline:none}.personalize-level-options{grid-template-columns:repeat(3,1fr);gap:.65rem;display:grid}.personalize-level-btn{text-align:left;border:1.5px solid var(--line);background:var(--paper);color:var(--ink);cursor:pointer;border-radius:10px;flex-direction:column;align-items:flex-start;padding:.75rem .85rem;transition:all .18s;display:flex}.personalize-level-btn strong{margin-bottom:.25rem;font-size:.88rem;line-height:1.25}.personalize-level-btn small{color:var(--ink-soft);-webkit-line-clamp:2;-webkit-box-orient:vertical;font-size:.72rem;line-height:1.35;display:-webkit-box;overflow:hidden}.personalize-level-btn:hover{border-color:var(--teal);transform:translateY(-1px)}.personalize-level-btn.is-selected{border-color:var(--teal);background:var(--teal-tint);box-shadow:0 4px 12px #146b631f}.personalize-level-btn.is-selected strong{color:var(--teal-deep)}.personalize-modal-actions{border-top:1px solid var(--line);justify-content:space-between;align-items:center;gap:.75rem;margin-top:.5rem;padding-top:1rem;display:flex}.personalize-submit-btn{background:var(--teal);color:#fff;font-family:var(--font-body);cursor:pointer;border:none;border-radius:999px;flex:1;padding:.8rem 1.4rem;font-size:.95rem;font-weight:700;transition:all .2s;box-shadow:0 4px 14px #146b6333}.personalize-submit-btn:hover{background:var(--teal-deep);transform:translateY(-1px);box-shadow:0 6px 18px #146b6347}.personalize-skip-btn{border:1px solid var(--line);color:var(--ink-soft);font-family:var(--font-body);cursor:pointer;background:0 0;border-radius:999px;padding:.8rem 1.1rem;font-size:.88rem;font-weight:600;transition:all .15s}.personalize-skip-btn:hover{background:var(--paper);color:var(--ink)}@media (width<=600px){.personalize-name-grid,.personalize-level-options{grid-template-columns:1fr}.personalize-modal-actions{flex-direction:column}.personalize-submit-btn,.personalize-skip-btn{text-align:center;width:100%}}.navbar__icon-btn--board.is-active,.navbar__action-btn--board.is-active{background:color-mix(in srgb, var(--teal) 35%, transparent)!important;border-color:var(--teal)!important;color:#fff!important}.navbar__action-btn--board.is-active:after{content:"";background:var(--gold);border-radius:999px;height:2px;position:absolute;bottom:0;left:10px;right:10px}.navbar__mode-text{font-size:.76rem;font-weight:700;font-family:var(--font-mono)}[data-display-mode=smartboard] main{width:96%!important;max-width:1440px!important;margin-inline:auto!important;padding:24px 32px 80px!important}[data-display-mode=smartboard] .note-page__content,[data-display-mode=smartboard] .note-page__body,[data-display-mode=smartboard] .article-page,[data-display-mode=smartboard] .article-page__body,[data-display-mode=smartboard] .note-visual-stack{width:100%!important;max-width:1360px!important;margin-inline:auto!important}[data-display-mode=smartboard] section,[data-display-mode=smartboard] .hero-section{width:100%!important;max-width:1440px!important}[data-display-mode=smartboard] .note-page h1,[data-display-mode=smartboard] .note-page__content h1{margin-bottom:1.5rem!important;font-size:clamp(2.5rem,4.5vw,3.6rem)!important;font-weight:800!important;line-height:1.2!important}[data-display-mode=smartboard] .note-page__summary,[data-display-mode=smartboard] .note-page__meta{font-size:1.25rem!important;line-height:1.6!important}[data-display-mode=smartboard] .note-page__body h2,[data-display-mode=smartboard] .article-page__body h2{border-bottom:3px solid var(--teal)!important;margin:3rem 0 1.25rem!important;padding-bottom:.6rem!important;font-size:2.1rem!important;line-height:1.3!important}[data-display-mode=smartboard] .note-page__body h3,[data-display-mode=smartboard] .article-page__body h3{color:var(--teal-deep)!important;margin:2.2rem 0 .85rem!important;font-size:1.6rem!important;line-height:1.35!important}[data-theme=dark][data-display-mode=smartboard] .note-page__body h3,[data-theme=dark][data-display-mode=smartboard] .article-page__body h3{color:var(--teal)!important}[data-display-mode=smartboard] .note-page__body p,[data-display-mode=smartboard] .note-page__body li,[data-display-mode=smartboard] .article-page__body p,[data-display-mode=smartboard] .article-page__body li{margin-bottom:1.25rem!important;font-size:1.3rem!important;line-height:1.9!important}[data-display-mode=smartboard] blockquote{border-left-width:6px!important;margin:1.8rem 0!important;padding:1.25rem 2rem!important;font-size:1.35rem!important;line-height:1.75!important}[data-display-mode=smartboard] .math-display,[data-display-mode=smartboard] .katex-display,[data-display-mode=smartboard] .note-math--display,[data-display-mode=smartboard] .note-formula{border-width:2.5px!important;border-radius:18px!important;max-width:1100px!important;margin:2.5rem auto!important;padding:1.75rem 2.5rem!important;font-size:1.45em!important}[data-display-mode=smartboard] .katex{font-size:1.3em!important}[data-display-mode=smartboard] table,[data-display-mode=smartboard] .note-visual-block--table table,[data-display-mode=smartboard] .note-page__body table{border-width:2px!important;width:100%!important;margin:2rem 0!important;font-size:1.2rem!important;line-height:1.6!important}[data-display-mode=smartboard] th{letter-spacing:.06em!important;background:var(--teal-tint)!important;padding:16px 22px!important;font-size:1.05rem!important}[data-display-mode=smartboard] td{padding:14px 22px!important;font-size:1.2rem!important}[data-display-mode=smartboard] .note-page__body img,[data-display-mode=smartboard] .article-page__body img,[data-display-mode=smartboard] .diagram-card,[data-display-mode=smartboard] .mermaid-diagram,[data-display-mode=smartboard] .note-flowchart{border-width:2px!important;border-radius:16px!important;max-width:1200px!important;max-height:680px!important;margin:2.5rem auto!important;box-shadow:0 8px 30px #00000014!important}[data-display-mode=smartboard] .diagram-card__canvas img,[data-display-mode=smartboard] .diagram-card__canvas svg,[data-display-mode=smartboard] .mermaid-diagram svg{max-width:100%!important;height:auto!important;max-height:600px!important;font-size:18px!important}[data-display-mode=smartboard] .note-end-action-btn,[data-display-mode=smartboard] .resume-tab-btn,[data-display-mode=smartboard] .hero-cta,[data-display-mode=smartboard] .hero-secondary,[data-display-mode=smartboard] .study-track-banner__btn,[data-display-mode=smartboard] .a11y-btn{border-radius:12px!important;min-height:52px!important;padding:12px 24px!important;font-size:1.1rem!important}[data-display-mode=smartboard] .home-note-card__btn{width:38px!important;height:38px!important;font-size:1.1rem!important}[data-display-mode=smartboard] .unit-sequence-dock{background:color-mix(in srgb, var(--paper-card) 98%, transparent)!important;padding:.45rem 1.5rem!important}[data-display-mode=smartboard] .a11y-floating-anchor{bottom:20px!important;left:20px!important}[data-theme=dark] .note-page__body,[data-theme=dark] .article-page__body,[data-theme=dark] .note-page__body h1,[data-theme=dark] .note-page__body h2,[data-theme=dark] .note-page__body h3,[data-theme=dark] .note-page__body h4,[data-theme=dark] .note-page__body h5,[data-theme=dark] .note-page__body h6{color:var(--ink)}[data-theme=dark] .note-page__body p,[data-theme=dark] .note-page__body li,[data-theme=dark] .note-page__body td,[data-theme=dark] .note-page__body th{color:var(--ink-soft)}[data-theme=dark] .note-page__body a{color:var(--teal)}[data-theme=dark] .note-page__body strong,[data-theme=dark] .note-page__body b{color:var(--ink)}[data-theme=dark] .note-page__body em,[data-theme=dark] .note-page__body i{color:var(--ink-soft)}[data-theme=dark] .note-page__body code{background:var(--paper-card);color:var(--teal);border-color:var(--line)}[data-theme=dark] .note-page__body pre{background:var(--paper-card);border-color:var(--line)}[data-theme=dark] .note-page__body pre code{color:var(--ink-soft)}[data-theme=dark] .note-page__body blockquote{border-left-color:var(--teal);background:var(--teal-tint);color:var(--ink-soft)}[data-theme=dark] .note-page__body hr{border-color:var(--line)}[data-theme=dark] .note-page__body ul,[data-theme=dark] .note-page__body ol{color:var(--ink-soft)}html,body{overflow-x:clip}.diagram-card,.note-flowchart{max-width:100%}@media (width<=520px){.navbar{gap:8px;padding:9px 12px}.navbar__brand{gap:6px;min-width:0}.navbar__brand a{white-space:nowrap;font-size:1.08rem}.navbar__brand-mark{padding:2px 4px;font-size:.58rem}.navbar__toggle{padding:6px}.navbar__mobile-actions{gap:5px}.navbar__mobile-btn{padding:6px 8px;font-size:1rem}}main:has(.whiteboard-page){max-width:100%!important;padding-left:14px!important;padding-right:14px!important}.whiteboard-page{box-shadow:none;background:0 0;border:none;max-width:100%;padding:0}.whiteboard-shell{flex-direction:column;gap:12px;padding-bottom:24px;display:flex}.whiteboard-header{flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:16px;display:flex}.whiteboard-header h2{margin:0;font-size:1.5rem}.whiteboard-subtitle{color:var(--ink-soft);max-width:680px;margin:0;font-size:.92rem}.wb-error-boundary{background:var(--paper-card);border:1px solid var(--line);border-radius:var(--radius);text-align:center;flex-direction:column;align-items:center;gap:10px;max-width:600px;margin:30px auto;padding:40px 24px;display:flex}.wb-error-boundary h3{color:var(--ink);margin:0;font-size:1.25rem}.wb-error-boundary p{color:var(--ink-soft);margin:0;font-size:.9rem}.whiteboard-container{border:1px solid var(--line);border-radius:var(--radius);background:var(--paper-card);flex-direction:column;height:calc(100vh - 190px);min-height:600px;display:flex;position:relative;overflow:hidden;box-shadow:0 4px 18px #0000000a}.whiteboard-container--fullscreen{z-index:999999!important;border:none!important;border-radius:0!important;width:100vw!important;height:100vh!important;position:fixed!important;inset:0!important}.wb-toolbar{background:var(--paper);border-bottom:1px solid var(--line);z-index:10;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;padding:8px 12px;display:flex}.wb-toolbar__left,.wb-toolbar__right{align-items:center;gap:8px;display:flex}.wb-btn{border:1px solid var(--line);background:var(--paper-card);color:var(--ink);cursor:pointer;-webkit-user-select:none;user-select:none;border-radius:6px;align-items:center;gap:6px;padding:6px 12px;font-size:.85rem;font-weight:600;transition:all .15s;display:inline-flex}.wb-btn:hover{background:var(--paper-soft);border-color:var(--ink-soft)}.wb-btn--primary{background:var(--teal);color:#fff;border-color:var(--teal)}.wb-btn--primary:hover{background:var(--teal-deep);border-color:var(--teal-deep);color:#fff}.wb-btn--ghost{background:0 0}.wb-btn--danger{color:var(--red);background:var(--red-tint);border-color:#e639464d}.wb-btn--danger:hover{background:var(--red);color:#fff;border-color:var(--red)}.wb-btn--active{border-color:var(--teal);box-shadow:0 0 0 2px #2a9d8f40}.wb-btn__chevron{opacity:.8;font-size:.75rem}.wb-dropdown{position:relative}.wb-menu{background:var(--paper-card);border:1px solid var(--line);z-index:100;border-radius:8px;width:320px;animation:.15s ease-out wbFadeIn;position:absolute;top:calc(100% + 6px);left:0;overflow:hidden;box-shadow:0 10px 25px #0000001f}.wb-menu--right{left:auto;right:0}.wb-menu--help{width:280px}@keyframes wbFadeIn{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.wb-menu__header{background:var(--paper-soft);border-bottom:1px solid var(--line);flex-direction:column;gap:2px;padding:10px 14px;display:flex}.wb-menu__header strong{color:var(--ink);font-size:.84rem}.wb-menu__header span{color:var(--ink-faint);font-size:.72rem}.wb-menu__list{flex-direction:column;gap:4px;max-height:380px;padding:6px;display:flex;overflow-y:auto}.wb-menu__item{color:var(--ink);cursor:pointer;text-align:left;background:0 0;border:none;border-radius:6px;align-items:flex-start;gap:10px;width:100%;padding:8px 10px;transition:background .12s;display:flex}.wb-menu__item:hover{background:var(--teal-tint)}.wb-menu__item-emoji{flex-shrink:0;font-size:1.25rem;line-height:1.2}.wb-menu__item-text{flex-direction:column;gap:2px;display:flex}.wb-menu__item-title{color:var(--ink);font-size:.84rem;font-weight:600}.wb-menu__item-desc{color:var(--ink-soft);font-size:.72rem;line-height:1.25}.wb-help-list{color:var(--ink);flex-direction:column;gap:6px;margin:0;padding:8px 14px;font-size:.8rem;list-style:none;display:flex}.wb-help-list li{align-items:center;gap:8px;display:flex}.wb-help-list kbd{background:var(--paper-soft);border:1px solid var(--line);color:var(--ink);border-radius:4px;padding:2px 6px;font-family:inherit;font-size:.72rem;font-weight:600}.wb-help-footer{color:var(--ink-soft);border-top:1px solid var(--line);background:var(--paper-soft);padding:8px 14px 10px;font-size:.75rem}.wb-canvas-viewport{flex:1;width:100%;height:100%;position:relative;overflow:hidden}.wb-canvas-viewport>div{width:100%!important;height:100%!important}.wb-toast{background:var(--ink);color:var(--paper);z-index:1000;pointer-events:none;border-radius:20px;padding:8px 16px;font-size:.82rem;font-weight:500;animation:.2s ease-out wbToastSlideUp;position:absolute;bottom:24px;left:50%;transform:translate(-50%);box-shadow:0 4px 14px #0003}@keyframes wbToastSlideUp{0%{opacity:0;transform:translate(-50%,10px)}to{opacity:1;transform:translate(-50%)}}@media (width<=768px){.whiteboard-container{height:75vh;min-height:480px}.wb-toolbar{flex-wrap:nowrap;padding:6px 8px;overflow-x:auto}.wb-btn__label{display:none}.wb-btn{padding:6px 10px}.wb-menu{width:280px}}.reading-progress-wire{top:var(--navbar-height,56px);z-index:95;pointer-events:none;background:#0000000a;width:100%;height:3px;transition:opacity .2s;position:fixed;left:0}.reading-progress-wire__fill{background:linear-gradient(90deg, var(--teal) 0%, #158b7e 40%, var(--gold) 100%);height:100%;transition:width .12s linear;position:relative;box-shadow:0 0 10px #146b6380}.reading-progress-wire__glow{width:7px;height:7px;box-shadow:0 0 8px 2px var(--gold);background:#fff;border-radius:50%;position:absolute;top:-2px;right:-2px}[data-theme=dark] .reading-progress-wire{background:#ffffff0d}[data-theme=dark] .reading-progress-wire__fill{background:linear-gradient(90deg,#2dd4bf 0%,#38bdf8 50%,#fbbf24 100%);box-shadow:0 0 12px #2dd4bfb3}[data-theme=dark] .reading-progress-wire__glow{background:#fbbf24;box-shadow:0 0 12px 3px #fbbf24e6}.math-display,.katex-display,.note-math--display{background:var(--paper-card);border:1px solid var(--line);-webkit-overflow-scrolling:touch;box-sizing:border-box;border-radius:12px;justify-content:center;align-items:center;max-width:680px;position:relative;overflow:auto hidden;box-shadow:0 4px 20px #0000000a,0 1px 3px #00000005;border-left:4.5px solid var(--gold)!important;margin:1.8rem auto!important;padding:1.5rem 1.75rem 1.25rem!important;display:flex!important}.math-display:after,.katex-display:after,.note-math--display:after{content:"EQUATION";font-family:var(--font-mono);letter-spacing:.08em;color:var(--gold);opacity:.8;pointer-events:none;font-size:.62rem;font-weight:700;position:absolute;top:7px;right:12px}.math-display::-webkit-scrollbar{height:4px}.katex-display::-webkit-scrollbar{height:4px}.note-math--display::-webkit-scrollbar{height:4px}.math-display::-webkit-scrollbar-thumb{background:var(--line);border-radius:4px}.katex-display::-webkit-scrollbar-thumb{background:var(--line);border-radius:4px}.note-math--display::-webkit-scrollbar-thumb{background:var(--line);border-radius:4px}[data-theme=dark] .math-display,[data-theme=dark] .katex-display,[data-theme=dark] .note-math--display{background:#111e2e;border-color:#ffffff14;box-shadow:0 6px 24px #0000004d;border-left-color:#fbbf24!important}[data-theme=dark] .math-display:after,[data-theme=dark] .katex-display:after,[data-theme=dark] .note-math--display:after{color:#fbbf24}[data-theme=warm] .math-display,[data-theme=warm] .katex-display,[data-theme=warm] .note-math--display{background:#fdfaf3;border-color:#b4872a40;border-left-color:var(--gold)!important}.subject-card__header-row,.level-card__header-row{justify-content:space-between;align-items:center;margin-bottom:10px;display:flex}.subject-card{border-top:4px solid var(--card-accent,var(--teal))!important;transition:transform .22s cubic-bezier(.16,1,.3,1),box-shadow .22s cubic-bezier(.16,1,.3,1),border-color .22s!important}.subject-card:hover{transform:translateY(-4px)!important;box-shadow:0 12px 26px -4px #122a3a17,0 4px 10px -2px #122a3a0a!important}.radial-progress-ring{flex-shrink:0;justify-content:center;align-items:center;width:34px;height:34px;display:inline-flex;position:relative}.radial-progress-ring--sm{width:30px;height:30px}.radial-progress-ring__svg{width:100%;height:100%;transform:rotate(-90deg)}.radial-progress-ring__track{fill:none;stroke:var(--line);stroke-width:3px}.radial-progress-ring__fill{fill:none;stroke-width:3px;stroke-linecap:round;transition:stroke-dashoffset .45s cubic-bezier(.16,1,.3,1)}.radial-progress-ring__text{font-family:var(--font-mono);color:var(--ink);font-size:.65rem;font-weight:700;line-height:1;position:absolute}.radial-progress-ring--sm .radial-progress-ring__text{font-size:.58rem}.study-track-banner__streak-pill{background:color-mix(in srgb, var(--gold) 15%, transparent);color:var(--gold);border:1px solid color-mix(in srgb, var(--gold) 35%, 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