:root{--bg:#f6f5f1;--panel:#fff;--panel-2:#fbfaf7;--ink:#1d1b18;--ink-2:#3d3a35;--muted:#76716a;--line:#e7e3da;--line-2:#d9d4c9;--accent:#e95420;--accent-ink:#c2410c;--accent-soft:#fdede6;--ok:#17845a;--ok-soft:#e4f4ec;--bad:#c62828;--bad-soft:#fdecec;--warn:#a8650b;--warn-soft:#fdf3e1;--blue:#1f6feb;--blue-soft:#e8f0fe;--code-bg:#f1eee7;--code-ink:#3b2f2a;--shadow:0 1px 2px #1e190f0d, 0 4px 16px #1e190f0d;--shadow-lg:0 10px 40px #1e190f1f;--radius:14px;--sans:"Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", system-ui, sans-serif;--mono:"JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, "D2Coding", "Apple SD Gothic Neo", monospace;--term-bg:#2c0a22;--term-bg-2:#3a1230;--term-fg:#eeeeec;--term-dim:#b9a9b4;--cm-bg:#fffdf9;--cm-fg:#2b2622;--cm-caret:#e95420;--cm-gutter-bg:#f4f1ea;--cm-gutter-fg:#a49d92;--cm-active:#e954200f;--cm-selection:#1f6feb38;--cm-panel:#f1eee7;--cm-keyword:#a626a4;--cm-string:#3f8a2b;--cm-comment:#8a857c;--cm-var:#c2410c;--cm-number:#b45309;--cm-op:#4b5563;--cm-fn:#1f6feb;--cm-meta:#0e7490;--cm-type:#0e7490;--cm-search:#ffc40059;--cm-search-outline:#c8960099;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#141217;--panel:#1c1a20;--panel-2:#211f26;--ink:#eeebe6;--ink-2:#cfcac3;--muted:#9b958d;--line:#2d2a32;--line-2:#3a3640;--accent:#ff7a45;--accent-ink:#ff9a6e;--accent-soft:#3a2018;--ok:#3ccf8e;--ok-soft:#14301f;--bad:#ff6b6b;--bad-soft:#3a1a1c;--warn:#f0b04a;--warn-soft:#33270f;--blue:#6aa6ff;--blue-soft:#18243a;--code-bg:#26232b;--code-ink:#f1d9cc;--shadow:0 1px 2px #0000004d, 0 4px 16px #00000040;--shadow-lg:0 10px 40px #00000080;--term-bg:#1d0617;--term-bg-2:#2a0d22;--cm-bg:#1a181e;--cm-fg:#e8e4dd;--cm-caret:#ff7a45;--cm-gutter-bg:#1f1d24;--cm-gutter-fg:#6d675f;--cm-active:#ff7a4512;--cm-selection:#6aa6ff47;--cm-panel:#24212a;--cm-keyword:#d68cf5;--cm-string:#9fd67a;--cm-comment:#7d776f;--cm-var:#ffa07a;--cm-number:#f5c26b;--cm-op:#b9b3aa;--cm-fn:#7fb2ff;--cm-meta:#67d4e6;--cm-type:#67d4e6;--cm-search:#ffc40040;--cm-search-outline:#ffc40080;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}}:root[data-theme=dark]{--bg:#141217;--panel:#1c1a20;--panel-2:#211f26;--ink:#eeebe6;--ink-2:#cfcac3;--muted:#9b958d;--line:#2d2a32;--line-2:#3a3640;--accent:#ff7a45;--accent-ink:#ff9a6e;--accent-soft:#3a2018;--ok:#3ccf8e;--ok-soft:#14301f;--bad:#ff6b6b;--bad-soft:#3a1a1c;--warn:#f0b04a;--warn-soft:#33270f;--blue:#6aa6ff;--blue-soft:#18243a;--code-bg:#26232b;--code-ink:#f1d9cc;--shadow:0 1px 2px #0000004d, 0 4px 16px #00000040;--shadow-lg:0 10px 40px #00000080;--term-bg:#1d0617;--term-bg-2:#2a0d22;--cm-bg:#1a181e;--cm-fg:#e8e4dd;--cm-caret:#ff7a45;--cm-gutter-bg:#1f1d24;--cm-gutter-fg:#6d675f;--cm-active:#ff7a4512;--cm-selection:#6aa6ff47;--cm-panel:#24212a;--cm-keyword:#d68cf5;--cm-string:#9fd67a;--cm-comment:#7d776f;--cm-var:#ffa07a;--cm-number:#f5c26b;--cm-op:#b9b3aa;--cm-fn:#7fb2ff;--cm-meta:#67d4e6;--cm-type:#67d4e6;--cm-search:#ffc40040;--cm-search-outline:#ffc40080;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased;word-break:keep-all;overflow-wrap:anywhere;font-size:15.5px;line-height:1.7}body.resizing{cursor:col-resize;-webkit-user-select:none;user-select:none}button{font:inherit;color:inherit;cursor:pointer;background:0 0;border:none;padding:0}input{font:inherit;color:inherit}code,kbd,pre,.mono{font-family:var(--mono)}code{background:var(--code-bg);color:var(--code-ink);border-radius:5px;padding:.1em .38em;font-size:.88em}kbd{text-align:center;background:var(--panel);border:1px solid var(--line-2);min-width:1.6em;color:var(--ink);border-bottom-width:2px;border-radius:6px;margin:0 .12em;padding:.05em .45em;font-size:.8em;font-weight:600;line-height:1.5;display:inline-block}h1,h2,h3,h4{letter-spacing:-.02em;margin:0;line-height:1.3}p{margin:.6em 0}.muted{color:var(--muted)}.small{font-size:.86rem}.lead{color:var(--ink-2);font-size:1.06rem}.icon{vertical-align:-.15em;flex:none}a{color:var(--accent-ink)}.app{grid-template-columns:264px minmax(0,1fr);height:100dvh;display:grid}.app.dock-open{grid-template-columns:264px minmax(0,1fr) auto}.sidebar{background:var(--panel);border-right:1px solid var(--line);flex-direction:column;min-height:0;display:flex;overflow-y:auto}.brand{text-align:left;align-items:center;gap:10px;padding:18px 18px 14px;display:flex}.brand-mark{background:var(--accent);color:#fff;border-radius:10px;place-items:center;width:34px;height:34px;display:grid;box-shadow:0 4px 12px #e9542059}.brand-name{letter-spacing:-.02em;font-size:1.05rem;font-weight:800;display:block}.brand-sub{color:var(--muted);margin-top:-2px;font-size:.75rem;display:block}.nav{flex-direction:column;flex:1;gap:2px;padding:4px 10px 12px;display:flex}.nav-label{color:var(--muted);letter-spacing:.06em;padding:14px 10px 6px;font-size:.72rem;font-weight:700}.nav-item{text-align:left;width:100%;color:var(--ink-2);border-radius:10px;align-items:center;gap:10px;padding:8px 10px;font-size:.93rem;transition:background .12s;display:flex}.nav-item:hover{background:var(--panel-2)}.nav-item.on{background:var(--accent-soft);color:var(--ink);font-weight:650}.nav-item.ch.on{background:color-mix(in srgb, var(--ch) 12%, transparent)}.nav-ico{text-align:center;width:24px;color:var(--muted)}.nav-no{color:var(--ch,var(--accent));width:28px;font-size:.72rem;font-weight:800;font-family:var(--mono)}.nav-title{flex:1}.nav-progress{min-width:4ch;color:var(--muted);font-variant-numeric:tabular-nums;text-align:right;white-space:nowrap;flex:none;margin-left:auto;font-size:.76rem;font-weight:700}.nav-item.on .nav-progress{color:var(--ch,var(--accent-ink))}.nav-sub{flex-direction:column;padding:2px 0 6px 48px;display:flex}.nav-sub button{text-align:left;color:var(--muted);border-radius:6px;padding:3px 8px;font-size:.86rem}.nav-sub button.on{color:var(--ink);font-weight:650}.nav-sub button:hover{color:var(--ink)}.sidebar-foot{border-top:1px solid var(--line);flex-direction:column;align-items:flex-start;gap:8px;padding:12px 16px 18px;display:flex}.theme-switch{background:var(--panel-2);border:1px solid var(--line);border-radius:9px;padding:2px;display:flex}.theme-switch button{color:var(--muted);border-radius:7px;padding:3px 10px;font-size:.78rem}.theme-switch button.on{background:var(--panel);color:var(--ink);box-shadow:var(--shadow)}.main{flex-direction:column;min-width:0;min-height:0;display:flex}.topbar{border-bottom:1px solid var(--line);background:color-mix(in srgb, var(--bg) 85%, transparent);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);align-items:center;gap:12px;min-height:54px;padding:10px 22px;display:flex}.crumb{color:var(--muted);white-space:nowrap;text-overflow:ellipsis;flex:1;font-size:.9rem;font-weight:600;overflow:hidden}.topbar-right{gap:8px;display:flex}.menu-btn{display:none}.content-scroll{scroll-behavior:smooth;flex:1;overflow:hidden auto}.scrim{display:none}.btn{border:1px solid var(--line-2);background:var(--panel);white-space:nowrap;border-radius:10px;align-items:center;gap:7px;padding:7px 14px;font-size:.9rem;font-weight:600;transition:transform 80ms,background .12s,border-color .12s;display:inline-flex}.btn:hover{border-color:var(--muted)}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.5;cursor:default}.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn.primary:hover{background:var(--accent-ink);border-color:var(--accent-ink)}.btn.sm{border-radius:8px;padding:4px 10px;font-size:.82rem}.btn.lg{border-radius:12px;padding:11px 20px;font-size:.98rem}.term-toggle.on{background:var(--term-bg);color:#fff;border-color:var(--term-bg)}.icon-btn{color:var(--muted);border-radius:7px;align-items:center;gap:4px;padding:4px 8px;font-size:.8rem;display:inline-flex}.icon-btn:hover{background:var(--panel-2);color:var(--ink)}.link-btn{color:var(--muted);text-underline-offset:3px;text-decoration:underline}.link-btn:hover{color:var(--ink)}.chip{border:1px solid var(--line-2);background:var(--panel);color:var(--ink-2);border-radius:999px;align-items:center;gap:4px;padding:3px 11px;font-size:.82rem;display:inline-flex}.chip:hover{border-color:var(--muted)}.chip.on{background:var(--ink);color:var(--bg);border-color:var(--ink)}.pill{background:var(--panel-2);border:1px solid var(--line);color:var(--ink-2);border-radius:999px;align-items:center;gap:4px;margin:0 2px;padding:2px 9px;font-size:.78rem;font-weight:650;display:inline-flex}.pill-accent{background:var(--accent-soft);color:var(--accent-ink);border-color:#0000}.pill-ok{background:var(--ok-soft);color:var(--ok);border-color:#0000}.pill-warn{background:var(--warn-soft);color:var(--warn);border-color:#0000}.pill-blue{background:var(--blue-soft);color:var(--blue);border-color:#0000}.search{border:1px solid var(--line-2);background:var(--panel);border-radius:10px;outline:none;width:100%;padding:9px 14px;font-size:.92rem}.search:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.search.big{margin-top:14px;padding:12px 16px;font-size:1rem}.cmd{background:var(--term-bg);color:#f5e9f0;vertical-align:middle;text-align:left;border:1px solid #0000;border-radius:8px;align-items:center;gap:6px;max-width:100%;margin:2px;padding:2px 9px 2px 7px;font-size:.84rem;transition:transform 80ms,box-shadow .12s;display:inline-flex}.cmd code{color:inherit;white-space:pre-wrap;overflow-wrap:anywhere;background:0 0;padding:0;font-size:1em}.cmd .icon{color:#ff9a6e}.cmd:hover{box-shadow:0 0 0 3px color-mix(in srgb, var(--accent) 30%, transparent)}.cmd:active{transform:translateY(1px)}.cmd-static{background:var(--code-bg);color:var(--code-ink);border-color:var(--line)}.home{max-width:1080px;margin:0 auto;padding:36px 32px 80px}.hero{grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);align-items:center;gap:36px;padding:18px 0 30px;display:grid}.hero h1{letter-spacing:-.04em;margin:10px 0 14px;font-size:clamp(2rem,4.2vw,3rem);font-weight:850}.kicker{letter-spacing:.05em;color:var(--accent-ink);text-transform:uppercase;font-size:.78rem;font-weight:750}.hero-actions{flex-wrap:wrap;gap:10px;margin-top:22px;display:flex}.hero-term{background:var(--term-bg);box-shadow:var(--shadow-lg);border-radius:16px;overflow:hidden;transform:rotate(.6deg)}.ht-bar{background:var(--term-bg-2);align-items:center;gap:6px;padding:10px 14px;display:flex}.ht-bar span{background:#ff5f57;border-radius:50%;width:11px;height:11px}.ht-bar span:nth-child(2){background:#febc2e}.ht-bar span:nth-child(3){background:#28c840}.ht-bar em{color:var(--term-dim);font-size:.78rem;font-style:normal;font-family:var(--mono);margin-left:8px}.hero-term pre{color:var(--term-fg);white-space:pre-wrap;margin:0;padding:16px 18px 20px;font-size:.82rem;line-height:1.65}.hero-term .p{color:#8ae234;font-weight:700}.hero-term .d{color:#729fcf;font-weight:700}.cursor{background:var(--term-fg);vertical-align:-.2em;width:.6em;height:1.1em;animation:1.1s step-end infinite blink;display:inline-block}@keyframes blink{50%{opacity:0}}.stats{grid-template-columns:repeat(4,1fr);gap:12px;margin:8px 0 28px;display:grid}.stat{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);align-items:center;gap:12px;padding:14px 16px;display:flex}.stat.clickable{cursor:pointer;flex-direction:column;align-items:flex-start;gap:0}.stat.clickable:hover{border-color:var(--line-2);box-shadow:var(--shadow)}.stat-num{letter-spacing:-.02em;font-size:1.45rem;font-weight:800;line-height:1.2}.chapter-cards{grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:14px;display:grid}.ch-card{text-align:left;background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:18px 18px 16px;transition:transform .12s,box-shadow .15s,border-color .15s;position:relative;overflow:hidden}.ch-card:before{content:"";background:var(--ch);height:4px;position:absolute;inset:0 0 auto}.ch-card:hover{box-shadow:var(--shadow-lg);border-color:#0000;transform:translateY(-2px)}.ch-card-top{justify-content:space-between;align-items:center;display:flex}.ch-no{font-family:var(--mono);color:var(--ch,var(--accent-ink));background:color-mix(in srgb, var(--ch,var(--accent)) 12%, transparent);border-radius:6px;padding:2px 8px;font-size:.78rem;font-weight:700}.ch-title{letter-spacing:-.02em;margin:10px 0 4px;font-size:1.18rem;font-weight:750}.ch-desc{color:var(--muted);min-height:2.7em;font-size:.87rem;line-height:1.55}.ch-links{flex-wrap:wrap;gap:6px;margin-top:14px;display:flex}.ch-links span{color:var(--ink-2);background:var(--panel-2);border:1px solid var(--line);border-radius:6px;padding:1px 8px;font-size:.75rem}.how{margin-top:36px}.how h2{margin-bottom:12px;font-size:1.3rem}.how-n{background:var(--accent);color:#fff;border-radius:50%;place-items:center;width:26px;height:26px;margin-bottom:8px;font-size:.82rem;font-weight:800;display:grid}.ring-bg{fill:none;stroke:var(--line);stroke-width:3px}.ring-fg{fill:none;stroke:var(--ok);stroke-width:3px;stroke-linecap:round;transition:stroke-dasharray .4s}.chapter,.reference{padding-bottom:80px}.ch-hero{max-width:1080px;margin:0 auto;padding:30px 32px 0}.ch-hero-top{align-items:center;gap:12px;display:flex}.ch-prog{color:var(--muted);align-items:center;gap:6px;font-size:.82rem;font-weight:600;display:inline-flex}.ch-hero h1{letter-spacing:-.035em;margin:10px 0 2px;font-size:clamp(1.7rem,3.2vw,2.3rem);font-weight:830}.tabs{border-bottom:1px solid var(--line);gap:4px;margin-top:20px;display:flex;overflow-x:auto}.tabs button{color:var(--muted);white-space:nowrap;border-bottom:2.5px solid #0000;align-items:center;gap:6px;margin-bottom:-1px;padding:10px 16px;font-weight:650;display:inline-flex}.tabs button:hover{color:var(--ink)}.tabs button.on{color:var(--ink);border-bottom-color:var(--ch,var(--accent))}.tab-badge{background:var(--ok-soft);color:var(--ok);border-radius:6px;padding:0 6px;font-size:.72rem}.concept-layout{grid-template-columns:190px minmax(0,1fr);gap:36px;max-width:1080px;margin:0 auto;padding:10px 32px;display:grid}.concept-layout.no-toc{grid-template-columns:minmax(0,1fr)}.toc{flex-direction:column;align-self:start;max-height:calc(100vh - 100px);padding-top:24px;display:flex;position:sticky;top:16px;overflow-y:auto}.toc-title{color:var(--muted);letter-spacing:.06em;margin-bottom:6px;font-size:.72rem;font-weight:750}.toc button{text-align:left;color:var(--muted);border-left:2px solid var(--line);padding:4px 10px;font-size:.84rem;line-height:1.45}.toc button:hover{color:var(--ink)}.toc button.on{color:var(--ink);border-left-color:var(--ch,var(--accent));font-weight:650}.article{min-width:0;max-width:800px}.lesson-section{border-bottom:1px solid var(--line);padding:30px 0 22px;scroll-margin-top:10px}.lesson-section:last-of-type{border-bottom:none}.lesson-section h2{margin:4px 0 12px;font-size:1.55rem;font-weight:800}.lesson-section h3{flex-wrap:wrap;align-items:baseline;gap:8px;margin:26px 0 8px;font-size:1.08rem;font-weight:750;display:flex}.lesson-section h3 code{font-size:1em}.h-sub{color:var(--muted);font-size:.82rem;font-weight:500}.next-cta{justify-content:center;padding:30px 0 10px;display:flex}.practice{max-width:900px;margin:0 auto;padding:24px 32px}.practice-intro{margin:34px 0 12px}.practice-intro h2{font-size:1.35rem;font-weight:800}.practice-intro:first-child{margin-top:6px}.card-grid{gap:10px;margin:14px 0;display:grid}.card-grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.card-grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}.mini-card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:12px 14px}.mini-card.accent{border-color:color-mix(in srgb, var(--accent) 45%, transparent);background:color-mix(in srgb, var(--accent) 5%, var(--panel))}.mc-k{margin-bottom:3px;font-weight:750}.mini-card.freedom{align-items:flex-start;gap:12px;display:flex}.fr-n{background:var(--accent-soft);width:32px;height:32px;color:var(--accent-ink);border-radius:10px;flex:none;place-items:center;font-weight:800;display:grid}.check-list{margin:10px 0;padding-left:0;list-style:none}.check-list li{margin:6px 0;padding-left:22px;position:relative}.check-list li:before{content:"";background:var(--ch,var(--accent));opacity:.8;border-radius:50%;width:7px;height:7px;position:absolute;top:.68em;left:4px}.flow-list{padding-left:22px}.flow-list li{margin:8px 0}.note{border:1px solid;border-radius:12px;gap:12px;margin:14px 0;padding:12px 14px;display:flex}.note-icon{flex:none;padding-top:2px}.note-body{min-width:0;font-size:.93rem}.note-body p:first-child{margin-top:0}.note-title{margin-bottom:2px;font-weight:750}.note-tip{background:var(--ok-soft);border-color:color-mix(in srgb, var(--ok) 25%, transparent)}.note-tip .note-icon{color:var(--ok)}.note-warn{background:var(--warn-soft);border-color:color-mix(in srgb, var(--warn) 30%, transparent)}.note-warn .note-icon{color:var(--warn)}.note-info{background:var(--blue-soft);border-color:color-mix(in srgb, var(--blue) 25%, transparent)}.note-info .note-icon{color:var(--blue)}.note-key{background:var(--accent-soft);border-color:color-mix(in srgb, var(--accent) 30%, transparent)}.note-key .note-icon{color:var(--accent-ink)}.quiz-inline>div{margin:4px 0}.codeblock{border:1px solid var(--line);background:var(--panel);border-radius:12px;margin:12px 0;overflow:hidden}.cb-head{background:var(--panel-2);border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:8px;padding:5px 8px 5px 12px;display:flex}.cb-title{color:var(--muted);font-size:.78rem;font-weight:650}.cb-actions{gap:4px;display:flex}.cb-actions button{color:var(--muted);border-radius:7px;align-items:center;gap:4px;padding:3px 9px;font-size:.76rem;font-weight:600;display:inline-flex}.cb-actions button:hover{background:var(--panel);color:var(--ink)}.cb-actions button.primary{background:var(--accent);color:#fff}.cb-actions button.primary:hover{background:var(--accent-ink)}.codeblock pre{background:var(--code-bg);margin:0;padding:12px 14px;font-size:.84rem;line-height:1.6;overflow-x:auto}.codeblock pre code{color:var(--code-ink);background:0 0;padding:0;font-size:1em}.termout{background:var(--term-bg);border-radius:12px;margin:12px 0;overflow:hidden}.to-title{color:var(--term-dim);font-size:.75rem;font-family:var(--mono);padding:7px 14px 0}.termout pre{color:var(--term-fg);white-space:pre-wrap;margin:0;padding:10px 14px 12px;font-size:.82rem;line-height:1.6;overflow-x:auto}.to-prompt{color:#8ae234;font-weight:700}.to-cmd{color:#fff}.table-wrap{margin:12px 0;overflow-x:auto}.opt-table,.cmp-table{border-collapse:separate;border-spacing:0;border:1px solid var(--line);background:var(--panel);border-radius:12px;width:100%;margin:10px 0;font-size:.9rem;overflow:hidden}.opt-table th,.cmp-table th{text-align:left;color:var(--muted);background:var(--panel-2);border-bottom:1px solid var(--line);padding:8px 12px;font-size:.78rem;font-weight:700}.opt-table td,.cmp-table td{border-bottom:1px solid var(--line);vertical-align:top;padding:8px 12px}.opt-table tr:last-child td,.cmp-table tr:last-child td{border-bottom:none}.opt-table td:first-child{width:42%}.opt-table td.mono{font-size:.85rem}.cmp-table td:first-child{white-space:nowrap;font-weight:650}.ox-mark{border-radius:50%;place-items:center;width:24px;height:24px;font-size:.8rem;font-weight:800;display:inline-grid}.ox-mark.o{background:var(--ok-soft);color:var(--ok)}.ox-mark.x{background:var(--bad-soft);color:var(--bad)}.cmp-table.license td{vertical-align:middle}.diagram{background:var(--panel);border:1px solid var(--line);border-radius:14px;margin:16px 0;padding:12px}.diagram svg{width:100%;height:auto;display:block}.diagram figcaption{color:var(--muted);padding:6px 6px 2px;font-size:.86rem}.svg-box{fill:var(--panel-2);stroke:var(--line-2);stroke-width:1.2px}.svg-box.accent{fill:color-mix(in srgb, var(--accent) 12%, var(--panel));stroke:var(--accent)}.svg-box.soft{fill:var(--blue-soft);stroke:color-mix(in srgb, var(--blue) 40%, transparent)}.svg-box.warn{fill:var(--warn-soft);stroke:color-mix(in srgb, var(--warn) 45%, transparent)}.svg-ink{fill:var(--ink)}.svg-muted{fill:var(--muted)}.svg-accent{fill:var(--accent-ink)}.svg-mono{font-family:var(--mono)}.svg-arrow{stroke:var(--muted);stroke-width:1.6px}.svg-arrowhead{fill:var(--muted)}.svg-sep{stroke:var(--line-2);stroke-dasharray:4 4}.vm-chip{fill:var(--panel);stroke:var(--line-2)}.vm-chip-text{fill:var(--ink-2)}.vm-edge.on .svg-arrow{stroke:var(--accent);stroke-width:2.4px}.vm-edge.on .vm-chip{fill:var(--accent);stroke:var(--accent)}.vm-edge.on .vm-chip-text{fill:#fff}.vm-info{text-align:center}.widget{background:var(--panel);border:1px solid var(--line);border-radius:14px;margin:16px 0;padding:14px 16px}.widget-title{color:var(--muted);margin-bottom:10px;font-size:.8rem;font-weight:700}.chmod-calc .cc-grid{grid-template-columns:1.4fr repeat(3,1fr) .6fr;align-items:center;gap:6px;display:grid}.cc-h{text-align:center;flex-direction:column;font-size:.78rem;font-weight:700;line-height:1.3;display:flex}.cc-who{font-size:.86rem;font-weight:650}.cc-cell{border:1px dashed var(--line-2);cursor:pointer;height:40px;font-family:var(--mono);color:var(--muted);-webkit-user-select:none;user-select:none;border-radius:10px;place-items:center;font-weight:700;transition:background .12s;display:grid}.cc-cell input{display:none}.cc-cell.on{background:var(--accent);border:1px solid var(--accent);color:#fff}.cc-sum{text-align:center;font-family:var(--mono);color:var(--accent-ink);font-size:1.3rem;font-weight:800}.cc-out{flex-wrap:wrap;align-items:center;gap:24px;margin-top:14px;display:flex}.cc-out label{color:var(--muted);flex-direction:column;font-size:.8rem;display:flex}.cc-out input{border:1px solid var(--line-2);background:var(--panel-2);letter-spacing:.1em;border-radius:10px;width:90px;padding:4px 10px;font-size:1.4rem;font-weight:800}.cc-sym{padding:4px 10px;font-size:1.15rem}.cc-cmds{flex-wrap:wrap;gap:4px;margin-top:10px;display:flex}.dt-wrap{grid-template-columns:200px 1fr;gap:16px;display:grid}.dt-tree{flex-direction:column;font-size:.84rem;display:flex}.dt-root{padding:2px 6px;font-weight:800}.dt-node{text-align:left;white-space:nowrap;border-radius:6px;padding:1px 6px}.dt-node:hover{background:var(--panel-2)}.dt-node.on{background:var(--accent-soft);color:var(--accent-ink);font-weight:700}.dt-branch{color:var(--muted)}.dt-info{background:var(--panel-2);border-radius:12px;align-self:start;padding:14px 16px;position:sticky;top:10px}.dt-name{font-size:1.3rem;font-weight:800}.dt-sub{background:var(--panel);border-radius:8px;margin:8px 0;padding:8px 10px;font-size:.82rem}.pr-inputs{grid-template-columns:1fr 1fr;gap:10px;display:grid}.pr-inputs label{color:var(--muted);flex-direction:column;gap:3px;font-size:.78rem;display:flex}.pr-inputs input,.q-input input{border:1px solid var(--line-2);background:var(--panel-2);color:var(--ink);border-radius:10px;outline:none;padding:8px 12px;font-size:.9rem}.pr-inputs input:focus,.q-input input:focus{border-color:var(--accent)}.pr-presets{flex-wrap:wrap;gap:6px;margin:10px 0;display:flex}.pr-presets .chip{font-family:var(--mono);font-size:.76rem}.pr-steps{margin:8px 0;padding-left:22px;font-size:.88rem}.pr-steps li{margin:4px 0}.pr-part{background:var(--accent-soft);color:var(--accent-ink)}.pr-arrow{color:var(--muted);margin:0 6px}.pr-result{flex-wrap:wrap;align-items:center;gap:10px;font-weight:650;display:flex}.iv-files{flex-wrap:wrap;gap:5px;margin-bottom:12px;display:flex}.iv-files .chip{font-family:var(--mono);font-size:.74rem}.iv-grid{grid-template-columns:1fr auto 1.5fr auto 1.2fr;align-items:stretch;gap:8px;display:grid}.iv-box{border:1px solid var(--line);border-radius:12px;min-width:0;padding:10px 12px;font-size:.84rem}.iv-name{background:var(--panel-2)}.iv-inode{background:color-mix(in srgb, var(--accent) 7%, var(--panel));border-color:color-mix(in srgb, var(--accent) 35%, transparent)}.iv-data{background:var(--blue-soft)}.iv-label{color:var(--muted);margin-bottom:4px;font-size:.72rem;font-weight:750}.iv-inode table{width:100%;font-size:.8rem}.iv-inode td:first-child{color:var(--muted);white-space:nowrap;padding-right:8px}.iv-data pre{white-space:pre-wrap;max-height:140px;margin:0;font-size:.76rem;overflow:auto}.iv-arrow{color:var(--muted);place-items:center;display:grid}.lc-q{border-bottom:1px dashed var(--line);justify-content:space-between;align-items:center;gap:12px;padding:8px 0;font-size:.92rem;display:flex}.lc-btns{flex:none;gap:6px;display:flex}.lc-rec{background:var(--accent-soft);border-radius:12px;margin-top:12px;padding:12px 14px}.lc-name{color:var(--accent-ink);font-size:1.3rem;font-weight:850}.timeline .tl-track{justify-content:space-between;margin:6px 4px 18px;display:flex;position:relative}.timeline .tl-track:before{content:"";background:var(--line-2);height:2px;position:absolute;top:8px;left:8px;right:8px}.tl-dot{z-index:1;flex-direction:column;align-items:center;gap:4px;display:flex;position:relative}.tl-dot:before{content:"";background:var(--panel);border:2px solid var(--line-2);border-radius:50%;width:16px;height:16px}.tl-dot.past:before{background:var(--accent-soft);border-color:var(--accent)}.tl-dot.on:before{background:var(--accent);border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}.tl-year{color:var(--muted);white-space:nowrap;font-size:.72rem;font-weight:700}.tl-dot.on .tl-year{color:var(--accent-ink)}.tl-card{background:var(--panel-2);border-radius:12px;padding:14px 16px}.tl-card-year{font-family:var(--mono);color:var(--accent-ink);font-size:.85rem;font-weight:700}.tl-card h4{margin:2px 0 4px;font-size:1.12rem}.tl-nav{justify-content:flex-end;gap:6px;display:flex}.venn{grid-template-columns:240px 1fr;align-items:center;gap:20px;display:grid}.venn-outer{background:var(--blue-soft);border:2px solid color-mix(in srgb, var(--blue) 45%, transparent);border-radius:50%;place-items:center;width:230px;height:230px;display:grid;position:relative}.venn-outer>.venn-label{color:var(--blue);font-size:.9rem;font-weight:750;position:absolute;top:26px}.venn-inner{background:var(--accent-soft);border:2px solid var(--accent);width:140px;height:140px;color:var(--accent-ink);border-radius:50%;place-items:center;margin-top:28px;font-size:.9rem;font-weight:750;display:grid}.lsl-anatomy{background:var(--term-bg);color:var(--term-fg);border-radius:12px;padding:14px 16px;overflow-x:auto}.lsl-row{white-space:pre;margin-bottom:10px;font-size:1rem}.lsl-legend{flex-wrap:wrap;gap:6px;display:flex}.lsl-legend span{background:#ffffff14;border-radius:6px;padding:1px 8px}.lsl-p.t,.lsl-legend .t{color:#fcd34d}.lsl-p.u,.lsl-legend .u{color:#fb923c}.lsl-p.g,.lsl-legend .g{color:#4ade80}.lsl-p.o,.lsl-legend .o{color:#60a5fa}.lsl-p.n,.lsl-legend .n{color:#e879f9}.lsl-p.ow,.lsl-legend .ow{color:#f9a8d4}.lsl-p.sz,.lsl-legend .sz{color:#67e8f9}.lsl-p.dt,.lsl-legend .dt{color:#cbd5e1}.lsl-p.nm,.lsl-legend .nm{color:#fff;font-weight:700}.wsl-steps{counter-reset:s;padding:0;list-style:none}.wsl-steps li{border:1px solid var(--line);background:var(--panel);border-radius:12px;margin:8px 0;padding:10px 14px}.wsl-steps li.ok{background:var(--ok-soft);border-color:color-mix(in srgb, var(--ok) 30%, transparent)}.wsl-check{cursor:pointer;align-items:center;gap:10px;display:flex}.wsl-check input{accent-color:var(--ok);width:16px;height:16px}.wsl-steps .codeblock{margin:8px 0 2px}.shell-versions{grid-template-columns:repeat(5,minmax(0,1fr));gap:8px;margin:12px 0;display:grid}.sv-item{border:1px solid var(--line);background:var(--panel);border-radius:12px;padding:10px 12px}.sv-item.on{border-color:var(--ch,var(--accent));background:color-mix(in srgb, var(--ch,var(--accent)) 7%, var(--panel))}.sv-year{color:var(--muted);font-size:.75rem;font-weight:650}.sv-name{font-size:1.2rem;font-weight:800}.reserved-grid{grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:6px 14px;max-height:340px;margin-top:10px;display:grid;overflow-y:auto}.rv-item{align-items:center;gap:6px;display:flex}.key-cheat .search{margin-bottom:12px}.kc-grid{grid-template-columns:repeat(auto-fill,minmax(330px,1fr));gap:12px;display:grid}.kc-group{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:10px 12px}.kc-title{color:var(--ch,var(--accent));margin-bottom:6px;font-size:.9rem;font-weight:750}.kc-row{border-top:1px dashed var(--line);grid-template-columns:minmax(120px,auto) 1fr;align-items:center;gap:10px;padding:4px 0;font-size:.84rem;display:grid}.kc-keys{white-space:nowrap}.mission-list,.script-list{flex-direction:column;gap:14px;display:flex}.mission,.script-lab{background:var(--panel);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:16px;padding:16px 18px}.mission-done,.script-lab.done{border-color:color-mix(in srgb, var(--ok) 40%, transparent)}.mission-head,.sl-head{align-items:center;gap:10px;display:flex}.mission-head h3,.sl-head h3{flex:1;font-size:1.08rem;font-weight:750}.mission-no{background:color-mix(in srgb, var(--ch,var(--accent)) 14%, transparent);color:var(--ch,var(--accent-ink));white-space:nowrap;border-radius:6px;padding:2px 8px;font-size:.74rem;font-weight:800}.mission-count{font-family:var(--mono);color:var(--muted);font-size:.85rem;font-weight:700}.mission-done .mission-count{color:var(--ok)}.mission-desc p{color:var(--ink-2);margin:6px 0;font-size:.93rem}.steps{margin:10px 0;padding:0;list-style:none}.steps li{border-radius:10px;align-items:flex-start;gap:10px;padding:7px 10px;font-size:.93rem;transition:background .3s;display:flex}.steps li.cur{background:var(--panel-2)}.steps li.ok .step-text{color:var(--muted)}.steps li.flash{background:var(--ok-soft)}.step-mark{border:1.5px solid var(--line-2);width:22px;height:22px;color:var(--muted);border-radius:50%;flex:none;place-items:center;margin-top:1px;font-size:.72rem;font-weight:750;display:grid}.steps li.ok .step-mark{background:var(--ok);border-color:var(--ok);color:#fff}.steps li.cur .step-mark{border-color:var(--accent);color:var(--accent-ink)}.mission-actions{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.mission-clear{background:var(--ok-soft);color:var(--ok);border-radius:10px;align-items:center;gap:8px;margin:8px 0;padding:9px 12px;font-weight:700;display:flex}.mission-help{flex-direction:column;gap:2px;margin-top:10px;display:flex}.data-box{border:1px solid var(--line);border-radius:10px;max-width:520px;margin:8px 0;overflow:hidden}.data-box-title{color:var(--muted);background:var(--panel-2);border-bottom:1px solid var(--line);font-size:.74rem;font-weight:700;font-family:var(--mono);padding:4px 10px}.data-box pre{background:var(--code-bg);color:var(--code-ink);margin:0;padding:8px 12px;font-size:.82rem}.reveal-btn{color:var(--muted);align-items:center;gap:4px;padding:4px 0;font-size:.86rem;font-weight:650;display:inline-flex}.reveal-btn .icon{transition:transform .15s}.reveal.open .reveal-btn .icon{transform:rotate(90deg)}.reveal-btn:hover{color:var(--ink)}.reveal-body{padding:2px 0 6px 18px}.hint-list{margin:4px 0;padding-left:18px;font-size:.9rem}.quiz{flex-direction:column;gap:12px;display:flex}.quiz-head{background:var(--panel);border:1px solid var(--line);border-radius:16px;justify-content:space-between;align-items:center;padding:14px 18px;display:flex}.quiz-head h3{font-size:1.12rem}.quiz-mode{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px 14px;padding:0 2px;display:flex}.quiz-mode-buttons{border:1px solid var(--line);background:var(--panel);border-radius:11px;gap:4px;padding:3px;display:inline-flex}.quiz-mode-buttons .btn{border-color:#0000}.quiz-mode-buttons .btn.on{background:var(--accent-soft);color:var(--accent-ink);border-color:var(--accent);font-weight:700}.quiz-score{text-align:right;color:var(--muted);font-weight:700}.quiz-score .big{color:var(--ink);font-size:1.8rem;font-weight:850}.qcard{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:14px 18px}.qcard.right{border-color:color-mix(in srgb, var(--ok) 40%, transparent)}.qcard.wrong{border-color:color-mix(in srgb, var(--bad) 40%, transparent)}.q-top{align-items:center;gap:8px;margin-bottom:4px;display:flex}.q-no{color:var(--ch,var(--accent-ink));font-weight:850}.q-tag{color:var(--muted);border:1px solid var(--line);border-radius:6px;padding:0 6px;font-size:.72rem}.q-res{align-items:center;gap:4px;margin-left:auto;font-size:.82rem;font-weight:750;display:inline-flex}.q-res.right{color:var(--ok)}.q-res.wrong{color:var(--bad)}.q-text{margin:4px 0 10px;font-weight:600}.q-options{flex-direction:column;gap:6px;display:flex}.opt{text-align:left;border:1px solid var(--line);border-radius:10px;align-items:center;gap:10px;padding:8px 12px;font-size:.93rem;transition:background .12s,border-color .12s;display:flex}.opt:not(:disabled):hover{border-color:var(--line-2);background:var(--panel-2)}.opt-key{background:var(--panel-2);border:1px solid var(--line);border-radius:7px;flex:none;place-items:center;width:24px;height:24px;font-size:.75rem;font-weight:750;display:grid}.opt.chosen{border-color:var(--ink)}.opt.chosen .opt-key{background:var(--ink);color:var(--bg)}.opt.right{border-color:var(--ok);background:var(--ok-soft)}.opt.right .opt-key{background:var(--ok);color:#fff;border-color:var(--ok)}.opt.wrong{border-color:var(--bad);background:var(--bad-soft)}.opt.wrong .opt-key{background:var(--bad);color:#fff;border-color:var(--bad)}.q-ox{gap:10px;display:flex}.ox{border:1.5px solid var(--line);border-radius:12px;width:72px;height:52px;font-size:1.4rem;font-weight:850}.ox:not(:disabled):hover{background:var(--panel-2)}.opt:disabled,.ox:disabled{cursor:default;opacity:1}.ox.chosen{border-color:var(--ink)}.ox.right{border-color:var(--ok);background:var(--ok-soft);color:var(--ok)}.ox.wrong{border-color:var(--bad);background:var(--bad-soft);color:var(--bad)}.q-input{align-items:center;gap:8px;display:flex}.q-input input{flex:1;min-width:0}.q-prompt{font-family:var(--mono);color:var(--accent-ink);font-weight:800}.q-actions{margin-top:10px}.q-explain{background:var(--panel-2);border-radius:10px;margin-top:10px;padding:10px 12px;font-size:.9rem}.q-explain-title{color:var(--accent-ink);margin-bottom:5px;font-size:.8rem;font-weight:800}.q-explain-answer{margin-bottom:5px;font-weight:700}.q-explain-body{line-height:1.6}.q-outs{margin-top:10px}.q-msg{color:var(--bad);margin-bottom:6px;font-size:.86rem;font-weight:650}.qcard.right .q-msg{color:var(--ok)}.q-out-grid{grid-template-columns:1fr 1fr;gap:8px;display:grid}.q-out-label{color:var(--muted);margin-bottom:3px;font-size:.72rem;font-weight:700}.q-out{background:var(--term-bg);color:var(--term-fg);white-space:pre-wrap;border-radius:10px;max-height:220px;margin:0;padding:8px 10px;font-size:.78rem;overflow:auto}.quiz-foot{justify-content:space-between;align-items:center;padding:4px;display:flex}.quiz-result{font-weight:750}.quiz-result.perfect{color:var(--ok)}.sl-desc{color:var(--ink-2);margin:6px 0 10px;font-size:.93rem}.sl-desc ol{margin:4px 0;padding-left:20px}.sl-editor{border:1px solid var(--line);border-radius:12px;overflow:hidden}.sl-bar{background:var(--panel-2);border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:8px;padding:5px 10px;display:flex}.sl-tools{align-items:center;gap:12px;display:flex}.switch{color:var(--muted);cursor:pointer;align-items:center;gap:5px;font-size:.8rem;font-weight:650;display:inline-flex}.switch input{accent-color:var(--accent)}.sl-actions{flex-wrap:wrap;gap:8px;margin:10px 0;display:flex}.sl-results{flex-direction:column;gap:6px;display:flex}.sl-test{border:1px solid var(--line);border-radius:10px;padding:6px 10px;font-size:.88rem}.sl-test summary{cursor:pointer;align-items:center;gap:6px;display:flex}.sl-test.ok{background:var(--ok-soft);border-color:#0000}.sl-test.bad{background:var(--bad-soft);border-color:#0000}.t-mark{color:#fff;border-radius:50%;place-items:center;width:18px;height:18px;display:inline-grid}.sl-test.ok .t-mark{background:var(--ok)}.sl-test.bad .t-mark{background:var(--bad)}.t-msg{color:var(--bad);font-weight:600}.sl-test .q-out{margin-top:6px}.solution{background:var(--code-bg);color:var(--code-ink);border-radius:10px;padding:10px 12px;font-size:.82rem;overflow-x:auto}.cm-host{height:100%}.cm-host .cm-editor{outline:none;height:100%}.cm-light .cm-editor{min-height:180px}.cm-term{--cm-bg:var(--term-bg);--cm-fg:#eeeeec;--cm-caret:#fcaf3e;--cm-gutter-bg:var(--term-bg-2);--cm-gutter-fg:#9b7d90;--cm-active:#ffffff0d;--cm-selection:#729fcf66;--cm-panel:var(--term-bg-2);--cm-keyword:#ad7fa8;--cm-string:#8ae234;--cm-comment:#8f7b89;--cm-var:#fcaf3e;--cm-number:#e9b96e;--cm-op:#d3d7cf;--cm-fn:#729fcf;--cm-meta:#34e2e2;--cm-type:#34e2e2}.vim-trainer{grid-template-columns:210px minmax(0,1fr);gap:16px;margin-bottom:20px;display:grid}.vt-list{flex-direction:column;gap:2px;max-height:640px;display:flex;overflow-y:auto}.vt-item{text-align:left;color:var(--ink-2);border-radius:9px;align-items:center;gap:8px;padding:6px 8px;font-size:.85rem;display:flex}.vt-item:hover{background:var(--panel)}.vt-item.on{background:var(--panel);box-shadow:var(--shadow);color:var(--ink);font-weight:650}.vt-num{background:var(--panel-2);border:1px solid var(--line);border-radius:7px;flex:none;place-items:center;width:22px;height:22px;font-size:.72rem;font-weight:750;display:grid}.vt-item.done .vt-num{background:var(--ok);color:#fff;border-color:var(--ok)}.vt-title{flex:1;line-height:1.35}.vt-best{font-family:var(--mono);color:var(--muted);font-size:.72rem}.vt-main{background:var(--panel);border:1px solid var(--line);border-radius:16px;min-width:0;padding:16px}.vt-goal h3{font-size:1.08rem;font-weight:750}.vt-goal-text{color:var(--ink-2);margin:4px 0 8px;font-size:.93rem}.vt-par{gap:6px;margin-bottom:8px;display:flex}.vt-panes{grid-template-columns:1fr 1fr;gap:10px;display:grid}.vt-pane{border:1px solid var(--line);border-radius:12px;flex-direction:column;min-width:0;display:flex;overflow:hidden}.vt-pane-head{color:var(--muted);background:var(--panel-2);border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;padding:5px 10px;font-size:.76rem;font-weight:700;display:flex}.vt-mode{font-family:var(--mono);background:var(--line);color:var(--ink-2);border-radius:5px;padding:1px 7px;font-size:.7rem}.vt-mode.m-insert{background:var(--ok);color:#fff}.vt-mode.m-visual,.vt-mode.m-v-line,.vt-mode.m-v-block{background:var(--blue);color:#fff}.vt-mode.m-replace{background:var(--bad);color:#fff}.vt-editor .cm-editor{min-height:170px;max-height:340px}.vt-target{background:var(--cm-bg);white-space:pre;tab-size:4;flex:1;margin:0;padding:8px 0;font-size:14px;line-height:1.6;overflow:auto}.vt-target div{padding-right:10px}.vt-target .ln{text-align:right;width:32px;color:var(--cm-gutter-fg);-webkit-user-select:none;user-select:none;padding-right:10px;display:inline-block}.vt-target .diff{background:color-mix(in srgb, var(--warn) 14%, transparent)}.vt-target .extra{color:var(--bad);padding-left:32px;font-size:.8rem}.vt-keys{align-items:center;gap:10px;margin:10px 0 4px;display:flex}.vt-count{white-space:nowrap;font-size:.9rem}.vt-count b{font-size:1.4rem;font-family:var(--mono)}.vt-keylog{white-space:nowrap;flex:1;justify-content:flex-end;display:flex;overflow:hidden;-webkit-mask-image:linear-gradient(90deg,#0000,#000 12%);mask-image:linear-gradient(90deg,#0000,#000 12%)}.vt-keylog kbd{font-size:.72rem}.vt-solved{background:var(--ok-soft);color:var(--ok);border-radius:10px;flex-wrap:wrap;align-items:center;gap:8px;margin:8px 0;padding:9px 12px;font-weight:650;display:flex}.vt-solved .btn{margin-left:auto}.vt-note{margin:6px 0}.vt-sol{flex-wrap:wrap;gap:2px;margin:4px 0;display:flex}.dock{width:var(--dock-w,520px);background:var(--term-bg);border-left:1px solid var(--line);flex-direction:column;max-width:70vw;min-height:0;display:flex;position:relative}.dock-resize{cursor:col-resize;z-index:5;width:8px;position:absolute;top:0;bottom:0;left:-4px}.dock-resize:hover{background:color-mix(in srgb, var(--accent) 40%, transparent)}.dock-head{background:var(--term-bg-2);color:var(--term-fg);justify-content:space-between;align-items:center;min-height:54px;padding:8px 10px 8px 14px;font-size:.82rem;display:flex}.dock-title{align-items:center;gap:6px;display:flex}.dock-title .muted{color:var(--term-dim)}.dot{border-radius:50%;width:11px;height:11px;display:inline-block}.dot.r{background:#ff5f57}.dot.y{background:#febc2e}.dot.g{background:#28c840;margin-right:6px}.dock-actions{gap:2px;display:flex}.dock-actions .icon-btn{color:var(--term-dim)}.dock-actions .icon-btn:hover{color:#fff;background:#ffffff14}.term{background:var(--term-bg);min-height:0;color:var(--term-fg);font-family:var(--mono);outline:none;flex-direction:column;flex:1;font-size:13.5px;line-height:1.5;display:flex;position:relative}.term-scroll{cursor:text;flex:1;padding:10px 14px 16px;overflow:hidden auto}.tl{white-space:pre-wrap;word-break:break-all;min-height:1.5em}.tl-input{flex-wrap:wrap;align-items:baseline;display:flex}.tl-prefix{white-space:pre-wrap;word-break:break-all}.term-input{min-width:60px;color:var(--term-fg);font-family:var(--mono);font-size:inherit;line-height:inherit;caret-color:#fcaf3e;background:0 0;border:none;outline:none;flex:60px;padding:0}.term-input.secret{color:#0000}.term-cursor{background:var(--term-dim);opacity:.6;vertical-align:-.2em;width:.55em;height:1.1em;animation:1.1s step-end infinite blink;display:inline-block}.term ::selection{background:#729fcf73}.a-bold{font-weight:700}.a-dim{opacity:.62}.a-it{font-style:italic}.a-ul{text-decoration:underline}.a-inv{background:var(--term-fg);color:var(--term-bg)}.a-k{color:#555753}.a-r{color:#ef2929}.a-g{color:#8ae234}.a-y{color:#fce94f}.a-b{color:#729fcf}.a-m{color:#ad7fa8}.a-c{color:#34e2e2}.a-w{color:#eeeeec}.ab-g{background:#4e9a06}.ab-k{background:#2e3436}.ab-r{background:#c00}.term-editor{background:var(--term-bg);z-index:4;flex-direction:column;display:flex;position:absolute;inset:0}.te-head{background:var(--term-bg-2);color:var(--term-dim);justify-content:space-between;align-items:center;padding:5px 12px;font-size:.78rem;display:flex}.te-file{color:#fff;font-weight:600}.te-mode{color:#fff;background:#ffffff1a;border-radius:5px;padding:1px 8px;font-weight:700}.te-mode.m-insert{background:#4e9a06}.te-mode.m-visual,.te-mode.m-visualline,.te-mode.m-visualblock{background:#3465a4}.te-mode.m-replace{background:#c00}.te-body{flex:1;min-height:0;overflow:hidden}.te-body .cm-host,.te-body .cm-editor{height:100%}.te-foot{background:var(--term-bg-2);color:var(--term-dim);justify-content:space-between;align-items:center;gap:10px;min-height:28px;padding:5px 12px;font-size:.76rem;display:flex}.te-msg{color:#fff;white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.te-help{white-space:nowrap}.nano-ask button{color:#fff;margin-left:8px;text-decoration:underline}.te-ime{color:#2e2a00;font-size:.82rem;font-family:var(--sans);background:#fce94f;padding:6px 12px}.te-ime.light{border-radius:10px;margin:8px 0}.term-page{flex-direction:column;gap:12px;height:100%;padding:20px 28px 24px;display:flex}.term-page-head h1{font-size:1.5rem;font-weight:800}.term-tips{flex-wrap:wrap;gap:6px;margin-top:8px;display:flex}.term-page-body{min-height:420px;box-shadow:var(--shadow-lg);border-radius:14px;flex:1;display:flex;overflow:hidden}.term-page-body .term{font-size:14.5px}.cat-chips{flex-wrap:wrap;gap:6px;margin:12px 0 4px;display:flex}.ref-grid{grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:12px;max-width:1080px;margin:0 auto;padding:18px 32px;display:grid}.ref-card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:14px 16px}.ref-head{flex-wrap:wrap;align-items:baseline;gap:8px;display:flex}.ref-name{color:var(--ink);background:0 0;padding:0;font-size:1.1rem;font-weight:800}.ref-cat{color:var(--muted);border:1px solid var(--line);border-radius:6px;margin-left:auto;padding:0 6px;font-size:.7rem}.ref-opts{border-collapse:collapse;width:100%;margin:6px 0;font-size:.82rem}.ref-opts td{border-top:1px dashed var(--line);vertical-align:top;padding:3px 0}.ref-opts td.mono{white-space:nowrap;color:var(--accent-ink);padding-right:10px;font-size:.78rem}.ref-ex{margin-top:6px}.ref-ex-row{flex-wrap:wrap;align-items:center;gap:6px;display:flex}@media (width<=1640px){.app.dock-open .concept-layout{grid-template-columns:minmax(0,1fr)}.app.dock-open .toc{display:none}}@media (width<=1100px){.app.dock-open{grid-template-rows:minmax(0,1fr) 46vh;grid-template-columns:264px minmax(0,1fr)}.app.dock-open .dock{border-left:none;border-top:1px solid var(--line);grid-area:2/2;width:auto;max-width:none}.app.dock-open .sidebar{grid-row:1/span 2}.dock-resize{display:none}.concept-layout{grid-template-columns:minmax(0,1fr)}.toc{display:none}.iv-grid{grid-template-columns:1fr}.iv-arrow{transform:rotate(90deg)}}@media (width<=860px){.app,.app.dock-open{grid-template-columns:minmax(0,1fr)}.app.dock-open{grid-template-rows:minmax(0,1fr) 50vh}.app.dock-open .dock{grid-column:1}.sidebar{z-index:50;width:280px;box-shadow:var(--shadow-lg);transition:transform .2s;position:fixed;inset:0 auto 0 0;transform:translate(-100%)}.sidebar.open{transform:none}.scrim{z-index:40;background:#00000059;display:block;position:fixed;inset:0}.menu-btn{display:inline-flex}.topbar{padding:8px 16px}.home,.ch-hero,.concept-layout,.practice,.ref-grid{padding-left:16px;padding-right:16px}.hero{grid-template-columns:minmax(0,1fr)}.hero-term{transform:none}.stats{grid-template-columns:repeat(2,1fr)}.card-grid.two,.card-grid.three,.vim-trainer{grid-template-columns:minmax(0,1fr)}.vt-list{flex-direction:row;max-height:none;overflow-x:auto}.vt-item{flex:none}.vt-title{white-space:nowrap}.vt-panes,.dt-wrap,.venn,.pr-inputs,.q-out-grid{grid-template-columns:minmax(0,1fr)}.shell-versions{grid-template-columns:repeat(2,minmax(0,1fr))}.opt-table td:first-child{width:auto}.ref-grid{grid-template-columns:minmax(0,1fr)}.chmod-calc .cc-grid{grid-template-columns:1.2fr repeat(3,1fr) .5fr}.te-help{display:none}.lc-q{flex-direction:column;align-items:flex-start}}.crash{background:var(--bad-soft);color:var(--ink);border-radius:12px;flex-direction:column;align-items:flex-start;gap:8px;margin:24px;padding:16px;display:flex}.practice{container-type:inline-size}@container (width<=760px){.vim-trainer{grid-template-columns:minmax(0,1fr)}.vt-list{flex-direction:row;max-height:none;padding-bottom:4px;overflow-x:auto}.vt-item{flex:none}.vt-title{white-space:nowrap}}@container (width<=600px){.vt-panes,.q-out-grid{grid-template-columns:minmax(0,1fr)}}.oj-container{flex-direction:column;gap:24px;max-width:1100px;margin:0 auto;padding:24px 28px 60px;display:flex}.oj-header{flex-direction:column;gap:20px;display:flex}.oj-title-row h1{color:var(--ink);letter-spacing:-.02em;margin:6px 0 10px;font-size:2rem;font-weight:800}.oj-kicker{color:var(--accent-ink);text-transform:uppercase;letter-spacing:.05em;align-items:center;gap:8px;font-size:.85rem;font-weight:600;display:inline-flex}.oj-badge-glow{background:var(--accent);color:#fff;letter-spacing:.08em;border-radius:999px;padding:2px 7px;font-size:.7rem;font-weight:800}.oj-stats-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);grid-template-columns:240px 1fr;align-items:center;gap:28px;padding:20px 24px;display:grid}@media (width<=768px){.oj-stats-card{grid-template-columns:1fr;gap:16px}}.oj-stat-main{align-items:center;gap:18px;display:flex}.oj-stat-num{color:var(--ink);font-size:1.8rem;font-weight:800;line-height:1.1}.oj-stat-label{color:var(--muted);margin-top:4px;font-size:.85rem}.oj-level-breakdown{grid-template-columns:repeat(4,1fr);gap:14px;display:grid}@media (width<=900px){.oj-level-breakdown{grid-template-columns:repeat(2,1fr)}}.oj-level-item{flex-direction:column;gap:6px;display:flex}.oj-level-item-top{justify-content:space-between;align-items:center;display:flex}.oj-progress-track{background:var(--line);border-radius:999px;height:6px;overflow:hidden}.oj-progress-fill{border-radius:999px;height:100%;transition:width .3s}.oj-level-pill{letter-spacing:.02em;border-radius:6px;padding:2px 8px;font-size:.72rem;font-weight:700;display:inline-block}.oj-filter-bar{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);flex-direction:column;gap:14px;padding:16px 20px;display:flex}.oj-level-tabs{flex-wrap:wrap;gap:8px;display:flex}.oj-tab{border:1px solid var(--line);color:var(--ink-2);cursor:pointer;background:0 0;border-radius:8px;padding:6px 14px;font-size:.85rem;font-weight:600;transition:all .2s}.oj-tab:hover{border-color:var(--line-2);background:var(--panel-2)}.oj-tab.on{background:var(--accent);color:#fff;border-color:var(--accent)}.oj-search-row{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.oj-search-box{background:var(--bg);border:1px solid var(--line);min-width:220px;color:var(--muted);border-radius:8px;flex:1;align-items:center;gap:8px;padding:6px 12px;display:flex}.oj-search-box input{color:var(--ink);background:0 0;border:none;outline:none;flex:1;font-size:.88rem}.oj-search-box .clear-btn{color:var(--muted);cursor:pointer;background:0 0;border:none;font-size:1rem}.oj-dropdown-filters{gap:8px;display:flex}.oj-select{background:var(--bg);border:1px solid var(--line);color:var(--ink);cursor:pointer;border-radius:8px;outline:none;padding:6px 12px;font-size:.84rem}.oj-table-wrap{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow-x:auto}.oj-table{border-collapse:collapse;width:100%;font-size:.9rem}.oj-table th{background:var(--panel-2);color:var(--muted);text-transform:uppercase;letter-spacing:.05em;border-bottom:1px solid var(--line);text-align:left;padding:12px 16px;font-size:.78rem;font-weight:700}.oj-table td{border-bottom:1px solid var(--line);vertical-align:middle;padding:14px 16px}.oj-row{cursor:pointer;transition:background .15s}.oj-row:hover{background:var(--panel-2)}.oj-row.solved{background:#17845a08}.oj-row-title{color:var(--ink);margin-bottom:2px;font-weight:600}.oj-tags-cell{flex-wrap:wrap;gap:6px;display:flex}.oj-tag{background:var(--bg);border:1px solid var(--line);color:var(--ink-2);border-radius:4px;padding:2px 7px;font-size:.72rem}.oj-check-icon{background:var(--ok-soft);width:24px;height:24px;color:var(--ok);border-radius:50%;justify-content:center;align-items:center;display:inline-flex}.oj-dot-icon{background:var(--line-2);border-radius:50%;width:10px;height:10px;display:inline-block}.oj-empty{text-align:center;color:var(--muted);padding:40px!important}.oj-solver-layout{flex-direction:column;gap:16px;max-width:1400px;margin:0 auto;padding:16px 24px 60px;display:flex}.oj-solver-topbar{border-bottom:1px solid var(--line);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;padding-bottom:12px;display:flex}.oj-solver-top-left{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.oj-solver-nav{background:var(--panel);border:1px solid var(--line);border-radius:8px;align-items:center;gap:6px;padding:2px 6px;display:inline-flex}.oj-problem-title{color:var(--ink);margin:0;font-size:1.3rem;font-weight:700}.oj-split-view{grid-template-columns:minmax(360px,1fr) minmax(440px,1.25fr);align-items:start;gap:20px;display:grid}@media (width<=960px){.oj-split-view{grid-template-columns:1fr}}.oj-left-pane{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);flex-direction:column;gap:20px;max-height:calc(100vh - 120px);padding:20px;display:flex;overflow-y:auto}.oj-doc-section h3{color:var(--ink);margin:0 0 8px;font-size:1.05rem;font-weight:700}.oj-doc-section h4{color:var(--muted);text-transform:uppercase;letter-spacing:.04em;margin:0 0 6px;font-size:.9rem;font-weight:600}.oj-prose{color:var(--ink-2);white-space:pre-wrap;font-size:.92rem;line-height:1.6}.oj-prose code{background:var(--code-bg);color:var(--code-ink);font-family:var(--mono);border-radius:4px;padding:2px 5px;font-size:.85em}.oj-sample-box{background:var(--bg);border:1px solid var(--line);border-radius:8px;flex-direction:column;gap:8px;margin-top:10px;padding:12px;display:flex}.oj-sample-head{color:var(--ink);justify-content:space-between;font-size:.82rem;font-weight:700;display:flex}.oj-sample-grid{grid-template-columns:1fr 1fr;gap:10px;display:grid}.oj-sample-label{color:var(--muted);text-transform:uppercase;margin-bottom:4px;font-size:.72rem;font-weight:600}.oj-sample-code{background:var(--panel);border:1px solid var(--line);font-family:var(--mono);color:var(--ink);white-space:pre-wrap;word-break:break-all;border-radius:6px;margin:0;padding:8px 10px;font-size:.84rem}.oj-hints-section{border-top:1px solid var(--line);flex-direction:column;gap:10px;padding-top:10px;display:flex}.oj-right-pane{flex-direction:column;gap:14px;display:flex}.oj-editor-header{background:var(--panel-2);border:1px solid var(--line);border-radius:var(--radius) var(--radius) 0 0;border-bottom:none;justify-content:space-between;align-items:center;padding:8px 14px;display:flex}.oj-editor-tools{align-items:center;gap:12px;display:flex}.oj-code-editor-box{border:1px solid var(--line);border-radius:0 0 var(--radius) var(--radius);box-shadow:var(--shadow);overflow:hidden}.oj-action-toolbar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;display:flex}.oj-action-left{gap:8px;display:flex}.oj-bottom-panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}.oj-bottom-tabs{background:var(--panel-2);border-bottom:1px solid var(--line);display:flex}.oj-btab{color:var(--muted);cursor:pointer;background:0 0;border:none;border-bottom:2px solid #0000;padding:10px 18px;font-size:.86rem;font-weight:600;transition:all .2s}.oj-btab:hover{color:var(--ink)}.oj-btab.on{color:var(--accent);border-bottom-color:var(--accent);background:var(--panel)}.oj-tab-content{padding:16px}.oj-results-empty{text-align:center;padding:24px}.oj-editor-tools{flex-wrap:wrap;justify-content:flex-end}.oj-storage-warning{color:var(--bad);border:1px solid var(--bad);border-radius:8px;margin:0;padding:8px 12px;font-size:.84rem}.oj-history{gap:10px;margin:0;padding:0;list-style:none;display:grid}.oj-history-item{border:1px solid var(--line);background:var(--bg);border-radius:10px;overflow:hidden}.oj-history-head{flex-wrap:wrap;align-items:center;gap:10px;padding:12px;display:flex}.oj-history-head .btn{margin-left:auto}.oj-history-verdict{font-size:.8rem;font-weight:700}.oj-history-verdict.ok{color:var(--ok)}.oj-history-verdict.fail{color:var(--bad)}.oj-history-detail{color:var(--ink-2);padding:0 12px 12px;font-size:.8rem}.oj-history-detail summary{cursor:pointer;width:fit-content;color:var(--muted)}.oj-history-detail pre{background:var(--panel-2);white-space:pre;border-radius:8px;max-height:300px;margin:8px 0 0;padding:12px;overflow:auto}.oj-tried-icon{color:var(--warn);font-size:.72rem;font-weight:700}.oj-loading-bar{text-align:center;color:var(--accent);padding:20px;font-weight:600;animation:1.5s infinite pulse}.oj-summary-banner{border-radius:10px;align-items:center;gap:14px;margin-bottom:14px;padding:14px 18px;display:flex}.oj-summary-banner.pass{background:var(--ok-soft);color:var(--ok);border:1px solid #17845a33}.oj-summary-banner.fail{background:var(--bad-soft);color:var(--bad);border:1px solid #c6282833}.oj-banner-title{font-size:1.05rem;font-weight:800}.oj-test-list{flex-direction:column;gap:8px;display:flex}.oj-test-row{border:1px solid var(--line);background:var(--bg);border-radius:8px;overflow:hidden}.oj-test-row summary{cursor:pointer;background:var(--panel);align-items:center;gap:10px;padding:10px 14px;font-size:.88rem;font-weight:600;display:flex}.oj-test-row.ok summary{color:var(--ok)}.oj-test-row.fail summary{color:var(--bad)}.oj-test-badge{border-radius:4px;padding:2px 7px;font-size:.76rem;font-weight:700}.oj-test-row.ok .oj-test-badge{background:var(--ok-soft);color:var(--ok)}.oj-test-row.fail .oj-test-badge{background:var(--bad-soft);color:var(--bad)}.oj-test-label{color:var(--ink);flex:1}.oj-test-detail{border-top:1px solid var(--line);flex-direction:column;gap:8px;padding:12px 14px;display:flex}.oj-fail-msg{color:var(--bad);font-size:.84rem;font-weight:600}.oj-diff-block{flex-direction:column;gap:4px;display:flex}.oj-diff-tag{color:var(--muted);font-size:.72rem;font-weight:600}.oj-pre-sm{background:var(--panel);border:1px solid var(--line);font-family:var(--mono);white-space:pre-wrap;border-radius:4px;margin:0;padding:6px 10px;font-size:.82rem}.oj-pre-sm.expected{background:#17845a0a;border-color:#17845a4d}.oj-pre-sm.actual{background:#c628280a;border-color:#c628284d}.oj-custom-container{flex-direction:column;gap:14px;display:flex}.oj-custom-inputs{grid-template-columns:1fr 1fr;gap:12px;display:grid}@media (width<=700px){.oj-custom-inputs{grid-template-columns:1fr}}.oj-textarea{box-sizing:border-box;background:var(--bg);border:1px solid var(--line);width:100%;font-family:var(--mono);color:var(--ink);resize:vertical;border-radius:8px;outline:none;padding:8px 10px;font-size:.85rem}.oj-input{box-sizing:border-box;background:var(--bg);border:1px solid var(--line);width:100%;font-family:var(--mono);color:var(--ink);border-radius:8px;outline:none;padding:8px 10px;font-size:.85rem}.oj-custom-result{background:var(--term-bg);border-radius:8px;flex-direction:column;gap:6px;padding:12px 14px;display:flex}.oj-custom-res-head{color:var(--term-dim);border-bottom:1px solid #ffffff1a;justify-content:space-between;padding-bottom:4px;font-size:.78rem;display:flex}.oj-console-out{font-family:var(--mono);color:var(--term-fg);white-space:pre-wrap;word-break:break-all;margin:0;font-size:.86rem}.oj-console-err{color:#ff8080}.oj-home-banner{border-radius:var(--radius);color:#fff;cursor:pointer;background:linear-gradient(135deg,#2c0a22 0%,#170512 100%);border:1px solid #4a1c3b;justify-content:space-between;align-items:center;gap:24px;padding:28px 32px;transition:transform .2s,box-shadow .2s;display:flex;box-shadow:0 8px 24px #2c0a2240}.oj-home-banner:hover{transform:translateY(-2px);box-shadow:0 12px 32px #2c0a2259}@media (width<=768px){.oj-home-banner{flex-direction:column;align-items:flex-start}}.oj-banner-tag{background:var(--accent);color:#fff;letter-spacing:.05em;border-radius:999px;margin-bottom:8px;padding:3px 8px;font-size:.72rem;font-weight:800;display:inline-block}.oj-banner-content h2{color:#fff;margin:0 0 8px;font-size:1.5rem;font-weight:800}.oj-banner-content p{color:#ddd4da;max-width:680px;margin:0 0 12px;font-size:.94rem;line-height:1.5}.oj-banner-meta{color:#ff9a6e;gap:8px;font-size:.82rem;font-weight:600;display:flex}.ch3-check{border:1px solid var(--line-2);background:var(--panel-2);border-radius:14px;margin:24px 0 2px;padding:18px 20px}.ch3-check-done{border-color:var(--ok)}.ch3-check-top{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.ch3-check-title{font-size:.88rem;font-weight:800}.ch3-check-tag{border:1px solid var(--line);color:var(--muted);border-radius:6px;padding:3px 7px;font-size:.72rem}.ch3-check-success{color:var(--ok);margin-left:auto;font-size:.82rem;font-weight:750}.ch3-check-question{margin:13px 0 14px;font-weight:650;line-height:1.6}.ch3-check-options{gap:7px;display:grid}.ch3-check-option{text-align:left;border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:9px;align-items:center;gap:10px;padding:11px 12px;font-size:.88rem;transition:border-color .12s,background .12s;display:flex}.ch3-check-option:not(:disabled):hover{border-color:var(--accent)}.ch3-check-option.is-wrong{border-color:var(--bad);background:var(--bad-soft)}.ch3-check-option.is-correct{border-color:var(--ok);background:var(--ok-soft)}.ch3-check-option:disabled{cursor:default;opacity:.8}.ch3-check-option-no{background:var(--code-bg);color:var(--ink-2);border-radius:6px;flex:0 0 22px;place-items:center;height:22px;font-size:.76rem;font-weight:700;display:inline-grid}.ch3-check-label{color:var(--muted);margin-bottom:7px;font-size:.8rem;display:block}.ch3-check-command-row{align-items:center;gap:9px;display:flex}.ch3-check-prompt{font-family:var(--mono);color:var(--accent);font-weight:750}.ch3-check-command-row input{border:1px solid var(--line-2);background:var(--panel);min-width:0;font-family:var(--mono);color:var(--ink);border-radius:8px;flex:1;padding:10px;font-size:.84rem}.ch3-check-command-row input:focus-visible,.ch3-check-option:focus-visible,.ch3-check-reset:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.ch3-check-command-row input:disabled{opacity:.7}.ch3-check-context{color:var(--muted);margin-top:8px;font-size:.75rem}.ch3-check-feedback{border-radius:8px;margin-top:13px;padding:10px 12px;font-size:.83rem;line-height:1.6}.ch3-check-feedback.success{background:var(--ok-soft);color:var(--ok)}.ch3-check-feedback.error{background:var(--bad-soft);color:var(--bad)}.ch3-check-reset{color:inherit;border:none;border-bottom:1px solid;margin-left:10px;padding:2px 6px;font-size:.8rem;font-weight:600;display:inline-block}.ch3-check-hint{color:var(--muted);margin-top:12px;font-size:.8rem}.ch3-check-hint summary{cursor:pointer;width:fit-content}.ch3-check-hint p{margin:6px 0 0}@media (width<=540px){.ch3-check{padding:14px}.ch3-check-command-row{flex-wrap:wrap}.ch3-check-command-row input{flex-basis:calc(100% - 32px)}.ch3-check-command-row button{margin-left:auto}}.home{max-width:1120px;padding-top:42px}.home .hero{gap:44px;padding:18px 0 38px}.home .stats{flex-wrap:wrap;gap:14px;margin:8px 0 48px;display:flex}.home .stats .stat{flex:165px;min-width:0;padding:17px 18px}.home-section-heading{flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:12px 24px;margin-bottom:22px;display:flex}.home-section-heading h2{letter-spacing:-.03em;margin:0 0 7px;font-size:clamp(1.3rem,2vw,1.6rem);font-weight:800}.home-section-heading p{color:var(--muted);margin:0;font-size:.9rem;line-height:1.6}.home-section-count{color:var(--muted);background:var(--panel);border:1px solid var(--line);border-radius:999px;flex:none;padding:6px 11px;font-size:.78rem;font-weight:650}.home .chapter-cards{flex-wrap:wrap;align-items:stretch;gap:20px;display:flex}.home .ch-card{flex-direction:column;flex:278px;min-width:0;min-height:194px;padding:23px 24px 21px;display:flex}.home .ch-title{margin:14px 0 8px;font-size:1.2rem}.home .ch-desc{min-height:0;line-height:1.65}.home .ch-links{gap:7px;margin-top:auto;padding-top:20px}.home .ch-links span{padding:4px 9px;line-height:1.35}.home-oj{margin-top:48px}.home .oj-home-banner{color:#fff;border-radius:20px;gap:36px;width:100%;min-width:0;padding:36px 40px;text-decoration:none}.home .oj-banner-content{min-width:0}.home .oj-banner-tag{color:#ffad87;letter-spacing:.025em;background:#ff7a4529;border:1px solid #ff9a6e47;margin-bottom:14px;padding:5px 11px}.home .oj-banner-content h2{letter-spacing:-.03em;margin-bottom:12px;font-size:clamp(1.4rem,2.4vw,1.75rem)}.home .oj-banner-content p{margin-bottom:18px;line-height:1.65}.home .oj-banner-meta{flex-wrap:wrap;row-gap:6px;line-height:1.5}.home .oj-banner-cta{white-space:nowrap;pointer-events:none;flex-shrink:0}.home .how{margin-top:54px}.home .how h2{margin-bottom:0;font-size:1.35rem}.home .how .card-grid{gap:18px;margin-top:18px}.home .how .mini-card{border-radius:16px;padding:20px 22px;line-height:1.65}.home .ch-card:focus-visible,.home .oj-home-banner:focus-visible{outline:2px solid var(--accent);outline-offset:4px}@container (width<=780px){.home .hero{grid-template-columns:minmax(0,1fr);gap:26px}.home .hero-term{transform:none}.home .oj-home-banner{flex-direction:column;align-items:flex-start;gap:24px}}@container (width<=560px){.home .stats{margin-bottom:38px}.home .chapter-cards{gap:16px}.home .ch-card{flex-basis:100%;min-height:0;padding:20px}.home-oj{margin-top:36px}.home .oj-home-banner{gap:22px;padding:26px 22px}.home .oj-banner-meta{gap:5px 8px}.home .how{margin-top:42px}}.home{container-type:inline-size}@media (prefers-reduced-motion:reduce){.home .ch-card,.home .oj-home-banner{transition:none}}.quick-check{background:var(--panel-2);border:1px solid var(--line-2);border-left:3px solid var(--ch,var(--blue));border-radius:12px;margin:24px 0 28px;overflow:hidden}.quick-check-head{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:16px;padding:16px 18px 13px;display:flex}.quick-check-label{color:var(--muted);letter-spacing:.04em;margin-bottom:4px;font-size:11px;font-weight:700;display:block}.quick-check-head h3{margin:0;font-size:16px;line-height:1.4}.quick-check-count{color:var(--muted);flex-shrink:0;font-size:12px;font-weight:700}.quick-check-body{padding:4px 18px 12px}.quick-check-item{padding:14px 0}.quick-check-item+.quick-check-item{border-top:1px solid var(--line)}.quick-check-question{margin:0 0 11px;font-size:14px;font-weight:600;line-height:1.6}.quick-check-question span{color:var(--accent-ink);margin-right:5px}.quick-check-options{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;display:grid}.quick-check-option{text-align:left;background:var(--panel);color:var(--ink);border:1px solid var(--line-2);font:inherit;cursor:pointer;border-radius:9px;align-items:flex-start;gap:9px;padding:10px 12px;font-size:13px;line-height:1.5;display:flex}.quick-check-option:hover:not(:disabled){border-color:var(--ch,var(--blue))}.quick-check-option:focus-visible,.quick-check-hint:focus-visible{outline:2px solid var(--blue);outline-offset:2px}.quick-check-option.correct{background:var(--ok-soft);border-color:var(--ok)}.quick-check-option:disabled{cursor:default}.quick-check-option-mark{border:1px solid var(--line);width:20px;height:20px;color:var(--muted);border-radius:5px;flex-shrink:0;justify-content:center;align-items:center;font-size:11px;display:inline-flex}.quick-check-entry{gap:8px;display:flex}.quick-check-entry input{min-width:0;color:var(--ink);background:var(--panel);border:1px solid var(--line-2);font:13px var(--mono);border-radius:8px;flex:1;padding:9px 11px}.quick-check-entry input:focus-visible{outline:2px solid var(--blue)}.quick-check-feedback:empty{display:none}.quick-check-feedback p{border-radius:8px;margin:10px 0 0;padding:9px 11px;font-size:12px;line-height:1.6}.quick-check-right{color:var(--ok);background:var(--ok-soft)}.quick-check-wrong{color:var(--bad);background:var(--bad-soft)}.quick-check-hint{color:var(--muted);cursor:pointer;background:0 0;border:0;margin-top:8px;padding:3px 0;font-size:12px;text-decoration:underline}.quick-check-hint-text{color:var(--muted);margin:5px 0;font-size:12px;line-height:1.6}.quick-check-complete{background:var(--ok-soft);color:var(--ok);margin:0;padding:10px 18px;font-size:12px;font-weight:600}@media (width<=640px){.quick-check-head{align-items:flex-start}.quick-check-options{grid-template-columns:1fr}}.vim-drills{margin-top:12px}.vd-progress{color:var(--ink-2);align-items:center;gap:8px;margin:12px 0 14px;font-size:.86rem;display:flex}.vd-progress b{color:var(--ink)}.vd-progress>span{background:var(--panel-2);border-radius:99px;flex:1;max-width:300px;height:7px;display:block;overflow:hidden}.vd-progress i{border-radius:inherit;background:var(--ok);height:100%;transition:width .2s;display:block}.vd-groups{grid-template-columns:repeat(auto-fit,minmax(155px,1fr));gap:7px;margin:12px 0;display:grid}.vd-group{border:1px solid var(--line);color:var(--ink-2);background:var(--panel);text-align:left;border-radius:11px;flex-direction:column;align-items:flex-start;gap:5px;padding:11px 12px;transition:border-color .15s,background .15s;display:flex}.vd-group:hover{border-color:var(--accent)}.vd-group.active{border-color:var(--accent);background:var(--accent-soft);color:var(--ink)}.vd-group strong{font-size:.87rem;line-height:1.35}.vd-group span{color:var(--muted);font-size:.76rem}.vd-description{color:var(--muted);margin:0 0 12px;font-size:.85rem}.vt-required{color:var(--muted);flex-wrap:wrap;align-items:center;gap:5px;margin:9px 0;font-size:.79rem;display:flex}.vt-required>span:first-child{color:var(--ink-2);margin-right:4px;font-weight:700}.vt-required>span:not(:first-child){margin-left:3px}.vd-limit{border:1px solid var(--line);background:var(--panel);color:var(--muted);border-radius:11px;margin:14px 0 22px;padding:12px 15px;font-size:.84rem;line-height:1.6}.vd-limit b{color:var(--ink-2)}.vd-limit p{margin:4px 0 0}@media (width<=760px){.vim-drills .vim-trainer{grid-template-columns:minmax(0,1fr)}.vim-drills .vt-list{max-height:175px}.vim-drills .vt-panes{grid-template-columns:minmax(0,1fr)}.vd-groups{grid-template-columns:repeat(2,minmax(0,1fr))}}.concept-check{border:1px solid var(--line);background:var(--panel-2);border-radius:12px;margin:20px 0 8px;padding:16px}.cc-heading{justify-content:space-between;align-items:center;gap:8px;margin-bottom:9px;display:flex}.cc-eyebrow{letter-spacing:.025em;color:var(--accent-ink);font-size:.75rem;font-weight:750}.cc-complete{color:var(--ok);font-size:.76rem;font-weight:700}.cc-question{color:var(--ink);margin-bottom:12px;font-size:.94rem;font-weight:650;line-height:1.55}.cc-choices{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;display:grid}.cc-choice{text-align:left;border:1px solid var(--line);background:var(--panel);min-width:0;min-height:43px;color:var(--ink-2);cursor:pointer;border-radius:9px;align-items:center;gap:9px;padding:9px 11px;font-size:.85rem;display:flex}.cc-choice:not(:disabled):hover{border-color:var(--accent)}.cc-choice:focus-visible,.cc-practice-toggle:focus-visible,.cc-input:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.cc-choice.correct{border-color:var(--ok);background:var(--ok-soft);color:var(--ok)}.cc-choice.wrong{border-color:var(--bad);background:var(--bad-soft);color:var(--bad)}.cc-choice:disabled{cursor:default}.cc-choice-letter{background:var(--bg);border-radius:6px;flex:none;place-items:center;width:23px;height:23px;font-size:.73rem;font-weight:750;display:inline-grid}.cc-input-row{align-items:center;gap:8px;display:flex}.cc-input{border:1px solid var(--line-2);background:var(--panel);min-width:0;color:var(--ink);font:.9rem var(--mono);border-radius:8px;flex:1;padding:10px 12px}.cc-feedback{flex-wrap:wrap;align-items:center;gap:12px;min-height:21px;margin-top:10px;font-size:.83rem;line-height:1.5;display:flex}.cc-feedback-ok{color:var(--ok)}.cc-feedback-wrong{color:var(--bad)}.cc-again{color:var(--accent-ink);text-underline-offset:3px;font-size:.8rem;text-decoration:underline}.cc-practice{border-top:1px solid var(--line);margin-top:13px;padding-top:11px}.cc-practice-toggle{text-align:left;width:100%;color:var(--ink-2);justify-content:space-between;align-items:center;gap:10px;font-size:.84rem;font-weight:700;display:flex}.cc-practice-meta{color:var(--muted);font-size:.76rem;font-weight:500}.cc-practice-body{min-width:0;margin-top:12px}.cc-practice-body .vim-trainer{margin:8px 0 0;display:block}.cc-practice-body .vt-list{display:none}.cc-practice-body .vt-main{box-shadow:none;border-radius:10px;padding:12px}@media (width<=700px){.cc-choices,.cc-practice-body .vt-panes{grid-template-columns:minmax(0,1fr)}}.shell-checkpoint{border:1px solid var(--line-2);border-left:3px solid var(--ch,var(--accent));background:var(--panel);border-radius:12px;margin:32px 0 8px;overflow:hidden}.shell-checkpoint-head{background:var(--panel-2);border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:16px;padding:16px 18px 12px;display:flex}.shell-checkpoint-eyebrow{color:var(--muted);letter-spacing:.02em;font-size:.72rem;font-weight:700;display:block}.shell-checkpoint-head h3{margin:3px 0 0;font-size:1rem}.shell-checkpoint-count{font-family:var(--mono);color:var(--ch,var(--accent));flex:none;font-size:.82rem;font-weight:700}.shell-checkpoint-item{padding:16px 18px 18px}.shell-checkpoint-item+.shell-checkpoint-item{border-top:1px solid var(--line)}.shell-checkpoint-number{color:var(--muted);margin-bottom:5px;font-size:.76rem;font-weight:700}.shell-checkpoint-prompt{margin-bottom:10px;font-size:.93rem;font-weight:600;line-height:1.6}.shell-checkpoint-code{white-space:pre-wrap;overflow-wrap:anywhere;background:var(--code-bg);color:var(--code-ink);border-radius:8px;margin:0 0 12px;padding:11px 12px;font-size:.84rem;line-height:1.65}.shell-checkpoint-code code{color:inherit;background:0 0;padding:0}.shell-checkpoint-options{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;display:grid}.shell-checkpoint-option{text-align:left;border:1px solid var(--line-2);background:var(--panel);border-radius:8px;min-width:0;padding:9px 12px;font-size:.84rem;line-height:1.45;transition:border-color .15s,background .15s}.shell-checkpoint-option:hover:not(:disabled),.shell-checkpoint-option:focus-visible{border-color:var(--ch,var(--accent))}.shell-checkpoint-option:disabled{cursor:default;opacity:.68}.shell-checkpoint-option.is-correct,.shell-checkpoint-option.is-correct:disabled{border-color:var(--ok);color:var(--ok);background:var(--ok-soft);opacity:1}.shell-checkpoint-form{align-items:stretch;gap:8px;display:flex}.shell-checkpoint-form input{border:1px solid var(--line-2);background:var(--panel);width:100%;min-width:0;font-family:var(--mono);border-radius:8px;flex:1;padding:9px 12px;font-size:.87rem}.shell-checkpoint-form input:focus{outline:2px solid var(--ch,var(--accent));outline-offset:1px}.shell-checkpoint-form input:disabled{opacity:.75}.shell-checkpoint-form .btn{flex:none}.shell-checkpoint-feedback{border-radius:7px;align-items:flex-start;gap:7px;margin-top:10px;padding:9px 11px;font-size:.81rem;line-height:1.55;display:flex}.shell-checkpoint-feedback .icon{flex:none;margin-top:2px}.shell-checkpoint-feedback.is-correct{background:var(--ok-soft);color:var(--ok)}.shell-checkpoint-feedback.is-wrong{background:var(--warn-soft);color:var(--warn)}.shell-checkpoint-try{color:var(--ch,var(--accent));align-items:center;gap:6px;margin-top:10px;font-size:.82rem;font-weight:600;display:inline-flex}.shell-checkpoint-try:hover{text-decoration:underline}.shell-checkpoint-complete{border-top:1px solid var(--line);background:var(--ok-soft);color:var(--ok);justify-content:space-between;align-items:center;gap:10px;padding:11px 18px;font-size:.81rem;display:flex}.shell-checkpoint-complete span{align-items:center;gap:7px;display:inline-flex}.shell-checkpoint-complete button{white-space:nowrap;font-weight:600;text-decoration:underline}@media (width<=540px){.shell-checkpoint-options{grid-template-columns:minmax(0,1fr)}.shell-checkpoint-head,.shell-checkpoint-item{padding-left:12px;padding-right:12px}.shell-checkpoint-complete{align-items:flex-start;padding:12px}}