@import"https://fonts.googleapis.com/css2?family=Syne:wght@400;500;600;700;800&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;1,9..40,300&display=swap";.login-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:10000;background:#0006;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;animation:loginFadeIn .2s ease}.login-modal{background:#fff;border-radius:12px;padding:32px;width:380px;max-width:calc(100vw - 40px);box-shadow:0 24px 64px #0000001f;animation:loginSlideUp .3s cubic-bezier(.22,1,.36,1)}.login-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:4px}.login-title{font-family:Syne,sans-serif;font-size:20px;font-weight:700;margin:0;letter-spacing:-.02em}.login-close{background:none;border:none;font-size:24px;color:#aaa;cursor:pointer;padding:0;line-height:1;transition:color .15s}.login-close:hover{color:#333}.login-desc{font-size:13px;color:#999;margin:0 0 20px;line-height:1.5}.login-input{width:100%;padding:12px 14px;border:1px solid #e5e2dc;border-radius:8px;font-size:15px;font-family:inherit;background:#faf9f7;color:#1c1b18;outline:none;transition:border-color .2s,box-shadow .2s}.login-input:focus{border-color:#1c1b18;box-shadow:0 0 0 3px #1c1b180f}.login-input::placeholder{color:#bbb}.login-error{font-size:13px;color:#dc2626;margin:8px 0 0}.login-submit{width:100%;margin-top:16px;padding:12px;background:#1c1b18;color:#f6f5f1;border:none;border-radius:8px;font-size:14px;font-weight:500;font-family:inherit;cursor:pointer;transition:background .2s}.login-submit:hover{background:#333}.login-submit:disabled{opacity:.5;cursor:not-allowed}@keyframes loginFadeIn{0%{opacity:0}to{opacity:1}}@keyframes loginSlideUp{0%{opacity:0;transform:translateY(16px) scale(.98)}to{opacity:1;transform:translateY(0) scale(1)}}.curtain{position:fixed;top:0;right:0;bottom:0;left:0;z-index:9999;background:#111;display:flex;align-items:center;justify-content:center;clip-path:inset(0 0 0 0);transition:clip-path .9s cubic-bezier(.76,0,.24,1)}.curtain--reveal,.curtain--ready{clip-path:inset(0 0 100% 0);pointer-events:none}.curtain-brand{display:flex;overflow:hidden}.curtain-ch{display:inline-block;font-family:Syne,sans-serif;font-size:clamp(36px,6vw,72px);font-weight:700;color:#e8e4de;letter-spacing:-.02em;animation:chUp .5s cubic-bezier(.22,1,.36,1) both;animation-delay:calc(var(--i) * 35ms + .15s)}@keyframes chUp{0%{transform:translateY(110%);opacity:0}to{transform:translateY(0);opacity:1}}.page{min-height:100vh;background:#f6f5f1;color:#1c1b18;opacity:0;transition:opacity .5s ease;font-family:DM Sans,-apple-system,PingFang SC,sans-serif}.page--visible{opacity:1}.topnav{position:fixed;top:0;left:0;right:0;z-index:100;display:flex;align-items:baseline;justify-content:space-between;padding:24px 48px;background:#f6f5f1e6;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px)}.topnav-brand{cursor:default}.topnav-logo{font-family:Syne,sans-serif;font-size:20px;font-weight:700;letter-spacing:-.02em}.topnav-right{display:flex;align-items:baseline;gap:28px}.topnav-link{font-size:13px;color:#aaa;cursor:pointer;letter-spacing:.02em;transition:color .2s}.topnav-link:hover{color:#1c1b18}.topnav-link--active{color:#1c1b18;text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1px}.topnav-time{font-size:12px;color:#bbb;font-variant-numeric:tabular-nums}.hero-banner{position:relative;width:100%;height:clamp(200px,28vh,320px);overflow:hidden;margin-top:72px}.hero-banner-img{width:100%;height:100%;object-fit:cover;object-position:center 40%;filter:brightness(.7) saturate(.8);transform:scale(1.02);animation:bannerZoom 20s ease-in-out infinite alternate}@keyframes bannerZoom{0%{transform:scale(1.02)}to{transform:scale(1.08)}}.hero-banner-overlay{position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(to bottom,#f6f5f126,#11111180)}.hero-banner-content{position:absolute;bottom:0;left:0;right:0;padding:28px 48px}.hero-label{font-size:11px;text-transform:uppercase;letter-spacing:.18em;color:#ffffff80;margin:0 0 12px;font-weight:500}.hero-heading{font-family:Syne,sans-serif;font-size:clamp(32px,4.5vw,56px);font-weight:700;letter-spacing:-.04em;line-height:1.1;margin:0;border:none;padding:0;color:#fff}.hero-heading--light{font-weight:400;color:#fff6}.hero-dot{color:#e8593a}.page-inner{max-width:960px;margin:0 auto;padding:0 48px}.entries{padding:40px 0 80px}.entry{display:grid;grid-template-columns:40px 1fr auto 32px;gap:20px;align-items:start;padding:24px 12px;border-top:1px solid rgba(0,0,0,.06);cursor:pointer;opacity:0;animation:entryIn .6s ease both;animation-delay:var(--delay);transition:background .3s,padding-left .3s;border-radius:4px;margin:0 -12px}.entry:last-child{border-bottom:1px solid rgba(0,0,0,.06)}.entry:hover{background:#00000005;padding-left:20px}.entry-num{font-family:Syne,sans-serif;font-size:12px;font-weight:600;color:#ccc;padding-top:4px;font-variant-numeric:tabular-nums;transition:color .25s}.entry:hover .entry-num{color:#1c1b18}.entry-body{min-width:0}.entry-title{font-family:Syne,sans-serif;font-size:clamp(17px,2vw,22px);font-weight:600;margin:0 0 4px;letter-spacing:-.01em;line-height:1.35}.entry-desc{font-size:13px;color:#999;margin:0;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.entry-meta{display:flex;flex-direction:column;align-items:flex-end;gap:4px;padding-top:2px;white-space:nowrap}.entry-tag{font-size:11px;font-weight:500;letter-spacing:.05em;text-transform:uppercase;color:#bbb}.entry-stat{font-size:12px;color:#ccc}.entry-arrow{font-size:16px;color:#ddd;padding-top:4px;transition:transform .3s,color .25s}.entry:hover .entry-arrow{transform:translate(4px);color:#1c1b18}@keyframes entryIn{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}.page-footer{display:flex;justify-content:space-between;align-items:center;padding:20px 48px;font-size:11px;color:#ccc;letter-spacing:.03em;border-top:1px solid rgba(0,0,0,.04)}@media(max-width:768px){.topnav{padding:18px 20px}.topnav-logo{font-size:17px}.topnav-time{display:none}.hero-banner{height:180px;margin-top:56px}.hero-banner-content{padding:20px}.hero-heading{font-size:24px}.page-inner{padding:0 20px}.entry{grid-template-columns:32px 1fr 24px;gap:12px;padding:18px 8px;margin:0 -8px}.entry-meta{display:none}.entry-title{font-size:16px}.entry-desc{-webkit-line-clamp:1;font-size:12px}.page-footer{padding:16px 20px;flex-direction:column;gap:4px}}@media(max-width:480px){.topnav-logo{font-size:15px}.hero-heading{font-size:22px}.entry-title{font-size:15px}}pre code.hljs{display:block;overflow-x:auto;padding:1em}code.hljs{padding:3px 5px}/*!
  Theme: GitHub
  Description: Light theme as seen on github.com
  Author: github.com
  Maintainer: @Hirse
  Updated: 2021-05-15

  Outdated base version: https://github.com/primer/github-syntax-light
  Current colors taken from GitHub's CSS
*/.hljs{color:#24292e;background:#fff}.hljs-doctag,.hljs-keyword,.hljs-meta .hljs-keyword,.hljs-template-tag,.hljs-template-variable,.hljs-type,.hljs-variable.language_{color:#d73a49}.hljs-title,.hljs-title.class_,.hljs-title.class_.inherited__,.hljs-title.function_{color:#6f42c1}.hljs-attr,.hljs-attribute,.hljs-literal,.hljs-meta,.hljs-number,.hljs-operator,.hljs-variable,.hljs-selector-attr,.hljs-selector-class,.hljs-selector-id{color:#005cc5}.hljs-regexp,.hljs-string,.hljs-meta .hljs-string{color:#032f62}.hljs-built_in,.hljs-symbol{color:#e36209}.hljs-comment,.hljs-code,.hljs-formula{color:#6a737d}.hljs-name,.hljs-quote,.hljs-selector-tag,.hljs-selector-pseudo{color:#22863a}.hljs-subst{color:#24292e}.hljs-section{color:#005cc5;font-weight:700}.hljs-bullet{color:#735c0f}.hljs-emphasis{color:#24292e;font-style:italic}.hljs-strong{color:#24292e;font-weight:700}.hljs-addition{color:#22863a;background-color:#f0fff4}.hljs-deletion{color:#b31d28;background-color:#ffeef0}:root{--bg: #f6f5f1;--panel: #ffffff;--ink: #1c1b18;--muted: #8a8580;--accent: #3d3a36;--accent-soft: #eae7e1;--line: #e5e2dc;--code-bg: #f0eee9}*{box-sizing:border-box}html,body{margin:0;padding:0;height:100%}body{font-family:DM Sans,-apple-system,BlinkMacSystemFont,PingFang SC,Source Han Sans CN,sans-serif;background:var(--bg);color:var(--ink);line-height:1.7;font-size:15px;overflow-x:hidden}.layout{display:grid;grid-template-columns:260px 1fr;min-height:100vh}.sidebar{border-right:1px solid var(--line);background:var(--panel);padding:28px 20px;position:sticky;top:0;height:100vh;overflow-y:auto}.main-content{padding:40px 56px 80px;max-width:1200px;min-width:0}.brand{font-family:Syne,sans-serif;font-size:17px;font-weight:700;margin-bottom:4px;letter-spacing:-.02em}.brand-sub{font-size:12px;color:var(--muted);margin-bottom:28px}.nav-section{text-transform:uppercase;font-size:11px;letter-spacing:.08em;color:var(--muted);margin:20px 0 6px;font-weight:600}.nav-item{display:block;padding:6px 10px;border-radius:6px;color:var(--ink);text-decoration:none;font-size:14px;margin:2px 0;border:1px solid transparent;cursor:pointer;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.nav-item:hover{background:var(--code-bg)}.nav-item.active{background:var(--accent-soft);border-color:var(--accent);color:var(--accent);font-weight:600}.nav-back{display:flex;align-items:center;gap:6px;padding:6px 10px;border-radius:6px;color:var(--ink);font-size:13px;font-weight:500;cursor:pointer;text-decoration:none;margin-bottom:8px;transition:background .15s}.nav-back:hover{background:var(--accent-soft)}.sidebar-footer{margin-top:auto;padding-top:20px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:8px}.sidebar{display:flex;flex-direction:column}.auth-status{font-size:12px;color:var(--muted)}.auth-btn{font-size:12px;padding:4px 12px;border:1px solid var(--line);background:var(--panel);border-radius:4px;cursor:pointer;color:var(--ink);transition:background .15s,border-color .15s}.auth-btn:hover{background:var(--accent-soft);border-color:var(--accent)}.home-hero{padding:48px 0 12px;text-align:center}.home-hero h1{font-size:44px;font-weight:800;letter-spacing:-.03em;background:linear-gradient(135deg,var(--ink) 30%,var(--accent) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1.2;margin:0;padding:0;border:none}.home-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;padding:36px 0}.module-card{position:relative;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:28px 24px 22px;cursor:pointer;text-decoration:none;color:inherit;display:block;transition:transform .28s cubic-bezier(.34,1.56,.64,1),box-shadow .28s ease,border-color .2s ease;overflow:hidden}.module-card:hover{transform:translateY(-6px);box-shadow:0 16px 40px #c2410c14,0 4px 12px #0000000a;border-color:var(--accent)}.module-card-icon{font-size:28px;margin-bottom:14px;display:block;transition:transform .3s ease}.module-card:hover .module-card-icon{transform:scale(1.15)}.module-card-title{font-size:18px;font-weight:700;margin-bottom:6px;line-height:1.3}.module-card-desc{font-size:13px;color:var(--muted);line-height:1.6;margin-bottom:16px;min-height:40px}.module-card-meta{display:flex;gap:14px;font-size:12px;color:var(--muted)}.module-card-badge{display:inline-block;font-size:11px;padding:2px 8px;border-radius:4px;font-weight:600}.module-card-badge.active{background:#dcfce7;color:#15803d}.module-card-badge.planned{background:#f3f4f6;color:#6b7280}.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:8px}.breadcrumb a{color:var(--ink);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px;cursor:pointer}.breadcrumb a:hover{color:var(--muted)}.breadcrumb-sep{margin:0 6px;color:var(--line)}.module-header{margin-bottom:32px}.module-header h1{font-family:Syne,sans-serif;font-size:28px;font-weight:700;margin:4px 0 8px;border:none;padding:0;letter-spacing:-.02em}.module-header-desc{font-size:14px;color:var(--muted);line-height:1.6}.section-label{font-family:Syne,sans-serif;font-size:11px;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);font-weight:600;margin:28px 0 10px}.chapter-list{display:flex;flex-direction:column;gap:0}.chapter-item{display:flex;align-items:baseline;gap:16px;padding:14px 0;border-bottom:1px solid var(--line);cursor:pointer;text-decoration:none;color:inherit;transition:padding-left .3s ease,background .2s}.chapter-item:first-child{border-top:1px solid var(--line)}.chapter-item:hover{padding-left:8px;background:#00000004}.chapter-num{font-family:Syne,sans-serif;font-size:12px;color:var(--muted);font-weight:600;font-variant-numeric:tabular-nums;min-width:24px;transition:color .2s}.chapter-item:hover .chapter-num{color:var(--ink)}.chapter-title{font-size:15px;font-weight:400;line-height:1.4}.diagrams-link{display:inline-block;font-size:14px;color:var(--ink);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px;cursor:pointer;margin-top:4px;transition:color .2s}.diagrams-link:hover{color:var(--muted)}.topbar{display:flex;align-items:center;gap:12px;margin-bottom:24px;padding-bottom:12px;border-bottom:1px solid var(--line);color:var(--muted);font-size:13px}.topbar-path{color:var(--accent);font-weight:600}.note-body h1{font-family:Syne,sans-serif;font-size:28px;margin:0 0 8px;padding-bottom:12px;border-bottom:2px solid var(--line);letter-spacing:-.02em}.note-body h2{font-size:22px;margin:36px 0 12px;padding-top:8px;border-top:1px solid var(--line);color:var(--ink);font-family:Syne,sans-serif;font-weight:600}.note-body h3{font-size:18px;margin:28px 0 8px}.note-body h4{font-size:16px;margin:20px 0 6px;color:var(--muted)}.note-body code{font-family:SF Mono,Menlo,Consolas,monospace;font-size:13px;background:var(--code-bg);padding:2px 6px;border-radius:4px}.note-body pre{background:var(--code-bg);padding:16px 20px;border-radius:8px;overflow-x:auto;border:1px solid var(--line)}.note-body pre code{background:none;padding:0;font-size:13px;line-height:1.6}.note-body blockquote{border-left:3px solid var(--line);margin:16px 0;padding:4px 16px;background:var(--accent-soft);border-radius:0 6px 6px 0}.note-body table{border-collapse:collapse;margin:16px 0;font-size:14px;width:100%}.note-body th,.note-body td{border:1px solid var(--line);padding:8px 12px;text-align:left}.note-body th{background:var(--code-bg);font-weight:600}.note-body hr{border:none;border-top:1px solid var(--line);margin:32px 0}.note-body details{background:var(--code-bg);padding:12px 16px;border-radius:8px;margin:16px 0;border:1px solid var(--line)}.note-body details summary{cursor:pointer;font-weight:600;color:var(--ink)}.note-body details[open] summary{margin-bottom:12px}.quiz-answer-wrap{margin:4px 0 12px}.quiz-answer-toggle{background:none;border:none;cursor:pointer;color:var(--muted);font-size:13px;padding:2px 0}.quiz-answer-toggle:hover{color:var(--accent)}.quiz-answer-box{display:none;margin-top:4px}.quiz-answer-box.open{display:block}.quiz-answer-box textarea{width:100%;min-height:60px;max-height:300px;padding:8px 10px;border:1px solid var(--line);border-radius:6px;font-size:13px;font-family:inherit;background:var(--panel);color:var(--ink);resize:vertical;line-height:1.6}.quiz-answer-box textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-soft)}.quiz-answer-status{font-size:11px;color:var(--muted);margin-top:2px;min-height:16px}.excalidraw-wrap{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:0;margin:24px 0;overflow:hidden}.excalidraw-wrap.static .excalidraw-svg-host{padding:16px 20px;background:var(--panel)}.excalidraw-wrap.static .excalidraw-svg-host svg{max-width:100%}.excalidraw-title{font-size:13px;color:var(--muted);padding:10px 16px;border-bottom:1px solid var(--line);background:var(--code-bg);font-weight:600;display:flex;justify-content:space-between;align-items:center;gap:8px}.diag-actions{display:flex;gap:6px}.save-btn,.reset-btn{padding:4px 10px;font-size:12px;border:1px solid var(--line);background:var(--panel);border-radius:4px;cursor:pointer;color:var(--ink)}.save-btn:not(:disabled):hover,.reset-btn:not(:disabled):hover{background:var(--accent-soft);border-color:var(--accent);color:var(--accent)}.save-btn:disabled,.reset-btn:disabled{opacity:.4;cursor:not-allowed}.excalidraw-mount{height:600px;width:100%;position:relative}.excalidraw-mount.inline{height:380px}.loading-tip{color:var(--muted);padding:40px;text-align:center;font-style:italic}.note-tooltip{position:absolute;z-index:300;background:var(--accent);color:#fff;font-size:13px;padding:4px 10px;border-radius:6px;cursor:pointer;white-space:nowrap;box-shadow:0 2px 8px #0000002e;-webkit-user-select:none;user-select:none}.note-tooltip:hover{filter:brightness(1.1)}.notes-fab{position:fixed;bottom:20px;right:20px;z-index:250;width:48px;height:48px;border-radius:50%;background:var(--accent);color:#fff;border:none;cursor:pointer;font-size:20px;box-shadow:0 2px 10px #0003;display:none;align-items:center;justify-content:center}.notes-fab.visible{display:flex}.notes-fab .badge{position:absolute;top:-4px;right:-4px;background:#dc2626;color:#fff;font-size:11px;min-width:18px;height:18px;border-radius:9px;display:flex;align-items:center;justify-content:center;font-weight:600}.notes-panel{display:none;position:fixed;bottom:80px;right:20px;z-index:260;width:380px;max-width:calc(100vw - 40px);max-height:60vh;background:var(--panel);border:1px solid var(--line);border-radius:12px;box-shadow:0 8px 24px #0000001f;overflow:hidden;flex-direction:column}.notes-panel.open{display:flex}.notes-panel-header{padding:12px 16px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;font-weight:600;font-size:15px;flex-shrink:0}.notes-panel-header .actions{display:flex;gap:6px}.notes-panel-header button{padding:4px 10px;border-radius:5px;font-size:12px;cursor:pointer;border:1px solid var(--line);background:var(--panel)}.notes-panel-header .copy-btn{background:var(--accent);color:#fff;border-color:var(--accent)}.notes-panel-header .clear-btn{color:#dc2626;border-color:#fecaca}.notes-panel-header .clear-btn:hover{background:#fef2f2}.notes-panel-body{overflow-y:auto;padding:12px 16px;flex:1}.notes-panel-empty{text-align:center;color:var(--muted);font-size:13px;padding:24px 0}.note-entry{padding:10px 0;border-bottom:1px solid var(--line)}.note-entry:last-child{border-bottom:none}.note-entry-quote{background:var(--code-bg);border-left:3px solid var(--accent);padding:6px 10px;border-radius:4px;font-size:12px;line-height:1.5;margin-bottom:6px;color:var(--muted);word-break:break-word}.note-entry-annotation{margin-top:4px}.note-entry-annotation textarea{width:100%;min-height:36px;max-height:120px;padding:6px 8px;border:1px solid var(--line);border-radius:5px;font-size:12px;font-family:inherit;resize:vertical;line-height:1.5;background:var(--panel);color:var(--ink)}.note-entry-annotation textarea:focus{outline:none;border-color:var(--accent)}.note-entry-annotation textarea::placeholder{color:var(--muted)}.note-entry-actions{display:flex;gap:8px;margin-top:4px;align-items:center}.note-entry-del{background:none;border:none;cursor:pointer;font-size:11px;color:var(--muted);padding:2px 0}.note-entry-del:hover{color:#dc2626}#auth-btn:hover{background:var(--accent-soft);border-color:var(--accent);color:var(--accent)}.mobile-menu-btn{display:none;position:fixed;top:12px;left:12px;z-index:200;width:40px;height:40px;border:1px solid var(--line);background:var(--panel);border-radius:8px;cursor:pointer;font-size:20px;line-height:1;align-items:center;justify-content:center;box-shadow:0 2px 6px #00000014}.mobile-menu-btn:active{background:var(--accent-soft)}.mobile-backdrop{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;z-index:150}.mobile-backdrop.show{display:block}@media(max-width:768px){body{font-size:16px}.layout{grid-template-columns:1fr}.sidebar{position:fixed;top:0;left:0;width:80%;max-width:320px;height:100vh;z-index:180;transform:translate(-100%);transition:transform .25s ease;box-shadow:2px 0 12px #0000001a;padding-top:60px}.sidebar.show{transform:translate(0)}.mobile-menu-btn{display:flex}.main-content{padding:64px 16px 60px;min-width:0;width:100vw;max-width:100vw;overflow-x:hidden}.main-content *{max-width:100%}.main-content img,.main-content svg{max-width:100%;height:auto}.home-hero{padding:32px 0 8px}.home-hero h1{font-size:28px}.home-grid{grid-template-columns:1fr;gap:14px;padding:20px 0}.module-card{padding:20px 18px 18px}.note-body h1{font-size:26px;padding-bottom:10px}.note-body h2{font-size:19px;margin:28px 0 10px}.note-body p,.note-body li{word-break:break-word;overflow-wrap:anywhere}.note-body pre{padding:12px 14px;border-radius:6px}.note-body pre code{font-size:12px}.note-body code{font-size:12px;padding:1px 5px}.note-body table{display:block;overflow-x:auto;white-space:nowrap;font-size:13px}.excalidraw-mount{height:400px}.notes-panel{right:10px;left:10px;bottom:70px;width:auto;max-width:none}.notes-fab{bottom:14px;right:14px;width:44px;height:44px}}@media(max-width:480px){.main-content{padding:60px 12px 40px}.note-body h1{font-size:22px}.note-body h2{font-size:17px}.excalidraw-mount{height:340px}.home-hero h1{font-size:22px}}