@import"https://fonts.googleapis.com/css2?family=Inter+Tight:wght@400;500;600;700;800&display=swap";:root{--navy: #0F2D52;--blue: #41A4FF;--yellow: #FFDD65;--lightblue: #D2EBF3;--grey: #ECECEC;--lgrey: #F6F6F6;--greyd: #222222;--greym: #7B7B7B;--cool: #CCCCCC;--white: #FFFFFF;--greenpale: #DDF3E9;--greent: #2D7A4F;--peach: #FFD4CB;--redt: #B84040;--bg: var(--white);--surface: var(--lgrey);--surface-2: var(--white);--ink: var(--greyd);--ink-soft: var(--greym);--line: var(--grey);--sidebar-bg: var(--navy);--font: "Aeonik", "Inter Tight", Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--mono: "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;--fs-body: 15.5px;--lh-body: 1.68;--fs-lead: 18px;--fs-h1: 35px;--fs-h2: 20.5px;--fs-h3: 16.5px;--fs-small: 13.4px;--fs-micro: 11px;--ls-tight: -.7px;--ls-caps: 1.7px;--s1: 4px;--s2: 8px;--s3: 12px;--s4: 16px;--s5: 20px;--s6: 24px;--s7: 32px;--s8: 44px;--s9: 64px;--r-sm: 8px;--r-md: 11px;--shadow: 0 2px 10px rgba(15, 45, 82, .08);--sidebar-w: 300px;--measure: 72ch;--content-w: 900px;--speed: .18s}:root[data-theme=dark]{--bg: #0B1D33;--surface: #12294A;--surface-2: #0F2440;--ink: #E6EDF6;--ink-soft: #9BB0C9;--line: #1E3A5F;--lgrey: #12294A;--grey: #1E3A5F;--sidebar-bg:#081627;--shadow: 0 2px 10px rgba(0, 0, 0, .35)}:root[data-theme=dark] figure img{background:var(--white);border-radius:var(--r-sm);padding:10px}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;font-family:var(--font);font-size:var(--fs-body);line-height:var(--lh-body);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}h1,h2,h3{margin:0;font-weight:700;color:var(--navy)}:root[data-theme=dark] h1,:root[data-theme=dark] h2{color:var(--ink)}p{margin:0 0 var(--s3);max-width:var(--measure)}a{color:var(--blue);text-decoration:none;cursor:pointer}a:hover{text-decoration:underline}:focus-visible{outline:2px solid var(--blue);outline-offset:2px;border-radius:3px}.ar{direction:rtl;unicode-bidi:isolate;font-family:var(--font)}.brandmark{display:block;height:26px;width:auto}.brandmark--footer{height:18px;opacity:.85}.eyebrow{font-size:var(--fs-micro);letter-spacing:var(--ls-caps);text-transform:uppercase;font-weight:700;color:var(--blue)}.chapter-title{font-size:var(--fs-h1);line-height:1.14;letter-spacing:var(--ls-tight);font-weight:800;padding-bottom:var(--s4);border-bottom:2px solid var(--blue);margin-bottom:var(--s6)}.section-title{font-size:var(--fs-h2);margin:var(--s7) 0 var(--s3);letter-spacing:-.2px}.sub-title{font-size:var(--fs-h3);color:var(--blue);margin:var(--s6) 0 var(--s2)}.lead{font-size:var(--fs-lead);line-height:1.55;color:var(--navy);border-left:4px solid var(--yellow);padding:3px 0 3px var(--s4);margin:0 0 var(--s6);max-width:var(--measure)}:root[data-theme=dark] .lead{color:var(--ink)}ul,ol{margin:0 0 var(--s4) var(--s5);max-width:var(--measure)}li{margin-bottom:7px;padding-left:var(--s1)}li::marker{color:var(--blue);font-weight:700}.caption{font-size:12.6px;color:var(--ink-soft);font-style:italic;text-align:center;margin-top:9px}.formula{position:relative;background:var(--lgrey);border-left:4px solid var(--blue);border-radius:0 var(--r-sm) var(--r-sm) 0;padding:var(--s3) var(--s4);margin:var(--s4) 0;font-weight:700;font-size:14.5px;color:var(--navy)}:root[data-theme=dark] .formula{color:var(--ink)}.table-wrap{overflow-x:auto;margin:var(--s4) 0 var(--s6);border:1px solid var(--line);border-radius:var(--r-md)}table{width:100%;border-collapse:collapse;font-size:var(--fs-small)}th{background:var(--navy);color:var(--white);text-align:left;padding:11px 13px;font-weight:600;font-size:12.6px;position:sticky;top:0}td{padding:10px 13px;border-top:1px solid var(--line);vertical-align:top;line-height:1.55}tbody tr:nth-child(2n){background:var(--lgrey)}.callout{border-radius:var(--r-md);padding:15px 18px;margin:var(--s5) 0;max-width:var(--measure)}.callout__label{font-size:10.5px;letter-spacing:var(--ls-caps);text-transform:uppercase;font-weight:800;margin-bottom:6px}.callout__body{font-size:14.6px;line-height:1.6}.callout--principle{background:var(--navy);color:var(--white)}.callout--principle .callout__label{color:var(--yellow)}.callout--control{background:var(--redt);color:var(--white)}.callout--control .callout__label{color:#ffd9d9}.callout--standard{background:var(--lightblue);color:var(--navy)}.callout--standard .callout__label{color:#2c6fa8}.callout--heuristic{background:var(--grey);color:var(--greyd)}.callout--heuristic .callout__label{color:var(--greym)}.callout--gcc{background:var(--yellow);color:var(--navy)}.callout--gcc .callout__label{color:#8a6b00}.callout--warning{background:var(--peach);color:var(--redt)}.callout--warning .callout__label{color:var(--redt)}.case{border-left:4px solid var(--blue);background:var(--lgrey);border-radius:0 var(--r-md) var(--r-md) 0;padding:var(--s4) var(--s5);margin:var(--s5) 0}.case__title{font-weight:800;color:var(--navy);font-size:15.5px;margin-bottom:11px}.case__row{display:flex;gap:var(--s3);margin-bottom:9px;font-size:14.2px;line-height:1.58}.case__key{flex:0 0 128px;font-weight:700;color:var(--blue)}:root[data-theme=dark] .case__title{color:var(--ink)}.code{position:relative;margin:var(--s5) 0}.code pre{background:var(--navy);color:#d8e4f2;border-radius:var(--r-md);padding:34px 20px 18px;overflow-x:auto;font-size:12.6px;line-height:1.6;margin:0}.code code{font-family:var(--mono)}.code__lang{position:absolute;top:10px;left:20px;font-size:10px;letter-spacing:1.6px;color:var(--blue);font-weight:800}.btn-copy{position:absolute;top:8px;right:10px;background:#ffffff1f;border:0;color:#cfe0f2;font-family:inherit;font-size:11.5px;padding:5px 11px;border-radius:7px;cursor:pointer}.btn-copy:hover{background:var(--blue);color:var(--white)}.practice{background:var(--lgrey);border-left:4px solid var(--navy);border-radius:0 var(--r-md) var(--r-md) 0;padding:15px 18px;margin:var(--s5) 0}.practice--l1{border-left-color:var(--blue)}.practice--l2{border-left-color:var(--navy)}.practice--l3{border-left-color:var(--redt)}.practice__head{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:var(--s2)}.level{font-size:10.5px;font-weight:800;letter-spacing:1.2px;color:var(--white);background:var(--navy);padding:2px 7px;border-radius:5px}.level--l1{background:var(--blue)}.level--l3{background:var(--redt)}.practice__word{font-size:10px;letter-spacing:var(--ls-caps);text-transform:uppercase;color:var(--ink-soft);font-weight:700}.practice__title{font-size:14.5px;font-weight:700;color:var(--navy)}:root[data-theme=dark] .practice__title{color:var(--ink)}.practice__task{font-size:14.4px;line-height:1.62;margin:0 0 11px}.attempt{width:100%;min-height:110px;resize:vertical;font-family:inherit;font-size:14px;line-height:1.6;padding:var(--s3);border:1px solid var(--cool);border-radius:var(--r-sm);background:var(--surface-2);color:var(--ink);margin-bottom:var(--s3)}.attempt:focus{border-color:var(--blue);outline:none}.answer{display:none;margin-top:var(--s3);padding-top:var(--s3);border-top:1px solid var(--cool)}.answer.is-open{display:block}.answer__trap{color:var(--redt)}.answer__senior{color:#2c6fa8}.btn{font-family:inherit;font-size:13px;font-weight:600;padding:8px 16px;border-radius:var(--r-sm);cursor:pointer;border:1.5px solid transparent;transition:background var(--speed),color var(--speed)}.btn--primary{background:var(--navy);color:var(--white)}.btn--primary:hover{background:#16406f}.btn--secondary{background:transparent;border-color:var(--blue);color:var(--blue)}.btn--secondary:hover{background:var(--blue);color:var(--white)}.btn--ghost{background:transparent;color:var(--ink-soft);border-color:var(--line)}.btn--ghost:hover{color:var(--navy);border-color:var(--navy)}.chip{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:600;padding:5px 11px;border-radius:999px;background:var(--lgrey);color:var(--navy);border:1px solid var(--line);cursor:pointer}.chip.is-on{background:var(--navy);color:var(--white);border-color:var(--navy)}.sidebar{position:fixed;inset:0 auto 0 0;width:var(--sidebar-w);height:100vh;background:var(--sidebar-bg);display:flex;flex-direction:column;overflow-y:auto;z-index:50}.sidebar__brand{padding:22px 22px 16px;border-bottom:1px solid rgba(255,255,255,.12)}.sidebar__sub{font-size:10.5px;letter-spacing:1.6px;text-transform:uppercase;color:#8fa8c4;margin-top:8px}.nav__part{font-size:10px;letter-spacing:var(--ls-caps);text-transform:uppercase;color:var(--blue);padding:18px 22px 7px;font-weight:700}.nav__item{display:flex;gap:9px;align-items:flex-start;padding:6.5px 22px;color:#c3d3e5;font-size:13.2px;line-height:1.4;border-left:2.5px solid transparent}.nav__item:hover{background:#ffffff0f;color:var(--white);text-decoration:none}.nav__item.is-active{background:#41a4ff29;border-left-color:var(--blue);color:var(--white);font-weight:600}.nav__num{flex:0 0 20px;color:var(--blue);font-weight:700;font-size:12px}.search-field{width:100%;padding:9px 12px;border-radius:9px;border:1px solid rgba(255,255,255,.18);background:#ffffff12;color:var(--white);font-family:inherit;font-size:13.5px}.search-field::placeholder{color:#7f96b2}.search-field:focus{border-color:var(--blue);outline:none}.search-overlay{position:fixed;inset:0;z-index:200;background:#0f2d528c;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);display:flex;justify-content:center;padding-top:12vh}.search-panel{width:min(720px,92vw);max-height:70vh;overflow:hidden;background:var(--surface-2);border-radius:var(--r-md);box-shadow:0 20px 60px #0f2d5259;display:flex;flex-direction:column}.search-result{padding:12px 16px;border-bottom:1px solid var(--line);cursor:pointer}.search-result.is-selected{background:var(--lightblue)}.search-result__crumb{font-size:11.5px;color:var(--ink-soft);margin-bottom:3px}.search-result__title{font-weight:700;color:var(--navy);font-size:14.5px}.search-result__snippet{font-size:13px;color:var(--ink);margin-top:3px}mark{background:var(--yellow);color:var(--navy);padding:0 2px;border-radius:2px}@keyframes land{0%{background:var(--yellow)}to{background:transparent}}.is-landed{animation:land 1.2s ease-out;border-radius:var(--r-sm)}.tree-node{border-radius:var(--r-md);padding:var(--s4) var(--s5);margin-bottom:var(--s3)}.tree-node--start{background:var(--navy);color:var(--white)}.tree-node--decision{background:var(--yellow);color:var(--navy)}.tree-node--step{background:var(--lightblue);color:var(--navy)}.tree-node--accent{background:var(--blue);color:var(--white)}.tree-node--outcome-good{background:var(--greenpale);color:var(--greent)}.tree-node--outcome-bad{background:var(--peach);color:var(--redt)}.tree-crumb{font-size:12.5px;color:var(--ink-soft);margin-bottom:var(--s2)}.meter{height:8px;background:var(--grey);border-radius:999px;overflow:hidden}.meter__fill{height:100%;background:var(--blue)}.meter__fill--done{background:var(--greent)}.main{margin-left:var(--sidebar-w);max-width:var(--content-w);padding:56px 64px 120px}@media(max-width:1000px){:root{--sidebar-w: 270px}.main{padding:48px 36px 100px}}@media(max-width:820px){.sidebar{transform:translate(-100%);transition:transform .22s}.sidebar.is-open{transform:none}.main{margin-left:0;padding:64px 20px 90px}.chapter-title{font-size:27px}.case__row{flex-direction:column;gap:2px}.case__key{flex:none}}@media print{.sidebar,.search-overlay,.btn,.chip,.btn-copy{display:none!important}.main{margin:0;max-width:none;padding:0}.answer{display:block!important}.callout,.practice,.case,.table-wrap,figure{break-inside:avoid}a[href^=http]:after{content:" (" attr(href) ")";font-size:10px;color:#666}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}:root{--app-font-sans: var(--font);--app-font-serif: var(--font);--app-font-mono: var(--mono)}body{min-width:320px}button,input,textarea,select{font:inherit}button{cursor:pointer}.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px}:root[data-theme=dark] h3{color:var(--ink)}.academy-app{min-height:100dvh;background:var(--bg)}.sidebar__brand a{display:block}.sidebar__brand img{width:150px;height:auto}.sidebar__search{padding:15px 22px 2px}.sidebar__tools{margin-top:auto;padding:12px 22px 18px;border-top:1px solid rgba(255,255,255,.12)}.sidebar__version{color:#8fa8c4;font-size:11px;margin-top:12px}.sidebar__changelog{display:inline-flex;align-items:center;gap:6px;margin-top:7px;color:#c3d3e5;font-size:12px}.sidebar__changelog:hover{color:var(--white)}.shell-topbar,.shell-backdrop{display:none}.nav__item svg{flex:0 0 16px;margin-top:1px}.nav__item .nav__num+span{min-width:0}.nav__part{display:grid;gap:3px}.nav__part-label{color:var(--blue)}.nav__part-title{color:#dce7f4;font-size:12px;letter-spacing:0;line-height:1.3;text-transform:none}.main{min-height:100dvh}.content-column{max-width:var(--content-w)}.page-enter{animation:page-in .18s ease both}@keyframes page-in{0%{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}.page-kicker{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:24px}.page-kicker__meta{color:var(--ink-soft);font-size:var(--fs-small)}.overview-title{font-size:clamp(30px,5vw,44px);line-height:1.06;letter-spacing:-1.2px;max-width:700px;margin-bottom:10px}.overview-lead{max-width:690px;font-size:var(--fs-lead);color:var(--navy);margin-bottom:28px}:root[data-theme=dark] .overview-lead{color:var(--ink)}.section-rule{display:flex;align-items:center;gap:12px;margin:36px 0 16px}.section-rule h2{font-size:var(--fs-h2)}.section-rule:after{content:"";height:1px;flex:1;background:var(--line)}.part-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.part-card{display:flex;flex-direction:column;justify-content:space-between;min-height:142px;padding:18px;border:1px solid var(--line);border-radius:var(--r-md);background:var(--surface-2);transition:border-color var(--speed),transform var(--speed)}.part-card:hover{border-color:var(--blue);text-decoration:none;transform:translateY(-2px)}.part-card__top{display:flex;justify-content:space-between;gap:10px}.part-card__label{color:var(--blue);font-size:var(--fs-micro);text-transform:uppercase;letter-spacing:var(--ls-caps);font-weight:700}.part-card h3{font-size:19px;margin:8px 0 0}.part-card__bottom{display:flex;gap:14px;color:var(--ink-soft);font-size:12px;margin-top:22px}.part-card__bottom span{display:inline-flex;gap:5px;align-items:center}.quick-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:12px}.quick-card{min-height:100px;padding:17px;border-radius:var(--r-md);background:var(--surface);border:1px solid var(--line)}.quick-card a{display:block;color:var(--navy);font-weight:700;font-size:16px;margin-bottom:6px}:root[data-theme=dark] .quick-card a{color:var(--ink)}.quick-card p{font-size:13px;color:var(--ink-soft);margin:0}.continue-card{display:flex;align-items:center;gap:20px;justify-content:space-between;padding:18px;border:1px solid var(--blue);border-radius:var(--r-md);background:var(--lightblue)}.continue-card h3{color:var(--navy);font-size:18px;margin:3px 0 5px}.continue-card p{margin:0;color:var(--navy);font-size:13px}.chapter-list{display:grid;gap:8px}.chapter-row{display:flex;align-items:center;gap:16px;padding:13px 14px;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--surface-2);color:var(--ink)}.chapter-row:hover{border-color:var(--blue);text-decoration:none}.chapter-row__num{width:32px;font-family:var(--mono);font-size:12px;color:var(--blue)}.chapter-row__body{flex:1;min-width:0}.chapter-row__title{font-weight:700;color:var(--navy)}:root[data-theme=dark] .chapter-row__title{color:var(--ink)}.chapter-row__meta{font-size:12px;color:var(--ink-soft)}.chapter-row svg{color:var(--blue)}.chapter-toc{border:1px solid var(--line);background:var(--surface);border-radius:var(--r-md);padding:14px 16px;margin-bottom:28px}.chapter-toc summary{cursor:pointer;font-weight:700;color:var(--navy)}:root[data-theme=dark] .chapter-toc summary{color:var(--ink)}.chapter-toc ul{margin:11px 0 0 18px}.chapter-toc li{margin-bottom:3px;font-size:13px}.reader{max-width:var(--content-w)}.reader>.block{scroll-margin-top:24px}.reader p,.reader .lead,.reader ul,.reader ol,.reader .callout,.reader .case,.reader .practice{max-width:var(--measure)}.reader .block--highlight{animation:land 1.2s ease-out}.reader h2,.reader h3{scroll-margin-top:24px}.reader figure{margin:24px 0;max-width:var(--content-w)}.reader figure img{display:block;max-width:100%;width:auto;height:auto;border-radius:var(--r-sm);cursor:zoom-in}.reader .copy-wrap{position:relative}.reader .copy-action{position:absolute;right:10px;top:8px}.reader .copy-action+*{padding-right:74px}.reader .practice__actions{display:flex;flex-wrap:wrap;align-items:center;gap:8px}.reader .practice textarea{min-height:110px}.practice-score{border-top:1px solid var(--cool);margin-top:14px;padding-top:13px}.score-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin:10px 0}.score-grid label{display:grid;gap:4px;font-size:12px;color:var(--ink-soft)}.score-grid select{border:1px solid var(--cool);border-radius:var(--r-sm);background:var(--surface-2);color:var(--ink);padding:6px}.score-band{padding:8px 10px;background:var(--greenpale);color:var(--greent);border-radius:var(--r-sm);font-size:13px;font-weight:700}.answer-copy{margin-top:11px;padding-top:11px;border-top:1px solid var(--cool)}.answer-copy strong{color:var(--navy)}:root[data-theme=dark] .answer-copy strong{color:var(--ink)}.lightbox{position:fixed;inset:0;z-index:210;background:#0f2d52b8;display:flex;align-items:center;justify-content:center;padding:30px}.lightbox__panel{max-width:min(1100px,94vw);max-height:90vh;background:var(--white);border-radius:var(--r-md);padding:14px;position:relative}.lightbox img{display:block;max-width:100%;max-height:calc(90vh - 48px);object-fit:contain}.lightbox button{position:absolute;right:8px;top:8px;border:0;color:var(--navy);background:var(--yellow);border-radius:var(--r-sm);width:32px;height:32px}.search-trigger{position:relative}.search-trigger__hint{position:absolute;right:8px;top:50%;transform:translateY(-50%);color:#7f96b2;font-size:11px;border:1px solid rgba(255,255,255,.18);border-radius:4px;padding:1px 4px}.search-overlay{padding-top:9vh}.search-panel__head{display:flex;align-items:center;gap:10px;padding:15px 16px;border-bottom:1px solid var(--line)}.search-panel__head input{flex:1;border:0;outline:0;background:transparent;color:var(--ink);font-size:17px}.search-panel__body{overflow:auto}.search-panel__empty{padding:20px 16px}.suggestions{display:flex;flex-wrap:wrap;gap:7px;margin-top:12px}.search-count{padding:8px 16px;font-size:12px;color:var(--ink-soft);border-bottom:1px solid var(--line)}.search-result__type{display:inline-block;margin-left:7px;color:var(--blue);font-size:10px;letter-spacing:.8px;text-transform:uppercase}.search-page__bar{display:flex;gap:10px;align-items:center;margin:20px 0 15px}.search-page__bar input{flex:1;max-width:560px;border:1px solid var(--line);background:var(--surface-2);color:var(--ink);border-radius:var(--r-sm);padding:10px 12px}.filter-row{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:18px}.tools-tabs{display:flex;flex-wrap:wrap;gap:8px;border-bottom:1px solid var(--line);padding-bottom:12px;margin-bottom:20px}.tools-layout{display:grid;grid-template-columns:240px 1fr;gap:22px}.tool-nav{display:grid;gap:7px;align-content:start}.tool-nav button{text-align:left;background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:var(--r-sm);padding:10px 12px}.tool-nav button.is-on{background:var(--navy);color:var(--white);border-color:var(--navy)}.tool-panel{min-width:0}.tool-card{border:1px solid var(--line);border-radius:var(--r-md);background:var(--surface-2);padding:17px;margin-bottom:12px}.tool-card h3{font-size:17px;margin-bottom:8px}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.form-grid label{display:grid;gap:4px;font-size:12px;color:var(--ink-soft)}.form-grid input,.form-grid select,.form-grid textarea{width:100%;border:1px solid var(--cool);border-radius:var(--r-sm);background:var(--surface-2);color:var(--ink);padding:8px 9px}.calc-result{background:var(--lightblue);color:var(--navy);margin-top:13px;padding:11px 13px;border-radius:var(--r-sm);font-weight:700}.tree-picker{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:16px}.tree-picker button{border:1px solid var(--line);background:var(--surface-2);border-radius:var(--r-sm);padding:7px 10px;color:var(--ink);font-size:12px}.tree-picker button.is-on{border-color:var(--blue);background:var(--lightblue);color:var(--navy)}.tree-walk{max-width:600px}.tree-node{white-space:pre-line}.tree-node h3{color:inherit;font-size:16px;margin-bottom:4px}.tree-choices{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}.tree-crumb{white-space:pre-line}.tree-done{margin-top:12px}.audit-item{border:1px solid var(--line);border-radius:var(--r-sm);padding:10px;margin-top:8px}.audit-item__head{display:flex;justify-content:space-between;gap:8px;font-weight:700;font-size:13px}.audit-item textarea{width:100%;margin-top:8px;border:1px solid var(--cool);border-radius:var(--r-sm);padding:7px;background:var(--surface-2);color:var(--ink);min-height:46px}.audit-item select{border:1px solid var(--cool);border-radius:var(--r-sm);background:var(--surface-2);color:var(--ink);padding:5px;margin-top:8px}.progress-summary{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.metric-card{padding:16px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md)}.metric-card strong{display:block;font-size:28px;color:var(--navy);line-height:1.1}:root[data-theme=dark] .metric-card strong{color:var(--ink)}.metric-card span{color:var(--ink-soft);font-size:12px}.data-table{width:100%}.data-table td,.data-table th{white-space:nowrap}.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}.toast-line{position:fixed;right:18px;bottom:18px;z-index:300;background:var(--navy);color:var(--white);padding:10px 14px;border-radius:var(--r-sm);font-size:13px}.shortcut-box{max-width:520px;background:var(--surface-2);border-radius:var(--r-md);padding:20px}.shortcut-box dl{display:grid;grid-template-columns:90px 1fr;gap:7px;font-size:13px}.shortcut-box dt{font-family:var(--mono);color:var(--blue)}.changelog-list{display:grid;gap:28px}.changelog-version{border-top:1px solid var(--line);padding-top:24px}.changelog-version__head{display:flex;align-items:flex-start;justify-content:space-between;gap:24px}.changelog-version__head h2{max-width:720px;margin:7px 0 0}.changelog-version__head time{color:var(--ink-soft);font-size:13px;white-space:nowrap}.changelog-stats{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0}.changelog-stats span{padding:6px 9px;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--surface);color:var(--ink-soft);font-size:12px}.changelog-section{display:grid;gap:9px;margin-top:24px}.changelog-section h3{margin-bottom:2px}.change-card{border-left:3px solid var(--blue);background:var(--surface-2);padding:14px 16px}.change-card--correction{border-left-color:#d84b4b}.change-card--breaking{border-left-color:var(--yellow)}.change-card strong,.change-card small{display:block}.change-card small{color:var(--ink-soft);margin-top:4px}.change-card p{margin:7px 0 0;max-width:var(--measure)}.change-card p span{font-weight:700}@media(max-width:820px){.shell-topbar{display:flex;position:fixed;inset:0 0 auto;z-index:45;height:54px;align-items:center;justify-content:space-between;padding:0 16px;background:var(--sidebar-bg)}.shell-topbar img{width:128px;height:auto}.shell-topbar button{color:var(--white);border:1px solid rgba(255,255,255,.2);background:transparent;border-radius:var(--r-sm);padding:6px}.shell-backdrop.is-open{display:block;position:fixed;inset:0;z-index:48;background:#0f2d526b}.sidebar{z-index:50}.main{padding-top:78px}.part-grid,.quick-grid{grid-template-columns:1fr}.progress-summary{grid-template-columns:1fr 1fr}.tools-layout{grid-template-columns:1fr}.tool-nav{display:flex;overflow:auto;padding-bottom:2px}.tool-nav button{white-space:nowrap}.score-grid{grid-template-columns:1fr 1fr}}@media(max-width:520px){.main{padding-left:16px;padding-right:16px}.page-kicker{align-items:flex-start;flex-direction:column;gap:8px}.chapter-title{font-size:27px}.form-grid,.progress-summary{grid-template-columns:1fr}.continue-card{align-items:flex-start;flex-direction:column}.chapter-row{gap:10px}.chapter-row__num{width:24px}.lightbox{padding:10px}.changelog-version__head{flex-direction:column;gap:8px}}