:root{--black:#0b0b0b;--white:#fff;--gray:#b7b4ae;--pink:#ea8990;--paper:#f5f4f2;--line:#d9d7d3;--muted:#686662}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--black);font-family:Arial,Helvetica,sans-serif}button,input,a{font:inherit}.topbar{position:fixed;inset:0 0 auto;height:72px;z-index:50;background:var(--black);color:#fff;display:flex;align-items:center}.brand{height:72px;width:352px;padding:0 24px;display:flex;align-items:center;gap:14px;color:#fff;text-decoration:none;border-right:1px solid #303030}.brand>span{width:38px;height:38px;border:2px solid var(--pink);display:grid;place-items:center;font-size:12px;font-weight:900}.brand b{letter-spacing:.22em;font-size:14px}.brand small{display:block;color:var(--gray);letter-spacing:.18em;font-size:8px;margin-top:3px}.menu{display:none;border:0;background:none;color:#fff;font-size:20px}.search{width:min(500px,38vw);height:40px;display:flex;align-items:center;margin-left:24px;background:#1c1c1c;border:1px solid #3a3a3a}.search span{padding-left:14px;color:var(--gray);font-size:21px}.search input{min-width:0;flex:1;border:0;outline:0;color:#fff;background:transparent;padding:0 12px}.status{margin-left:auto;padding:0 22px;color:var(--gray);font-size:9px;letter-spacing:.15em}.rail{position:fixed;top:72px;bottom:0;left:0;width:352px;z-index:40;background:#171717;color:#fff;border-right:1px solid #333}.rail-title{height:62px;padding:0 24px;display:flex;align-items:center;justify-content:space-between;color:var(--gray);font-size:10px;letter-spacing:.2em;border-bottom:1px solid #333}.rail nav{height:calc(100% - 62px);overflow:auto;padding:10px 0 80px}.rail button{width:100%;color:#fff;border:0;background:transparent;display:grid;grid-template-columns:40px 1fr;gap:7px;text-align:left;padding:12px 20px 12px 24px;cursor:pointer;border-left:3px solid transparent}.rail button:hover,.rail button.active{background:#242424}.rail button.active{border-left-color:var(--pink)}.rail button>span{color:#777;font-size:9px}.rail strong{display:block;font-size:11px;letter-spacing:.08em;text-transform:uppercase}.rail small{display:block;color:#96938f;font-size:9px;line-height:1.35;margin-top:4px}.workspace{margin-left:352px;padding-top:72px;min-height:100vh}.workspace-head{padding:44px 5vw 28px;display:flex;align-items:flex-end;justify-content:space-between;gap:30px}.workspace-head small{color:#77746f;font-size:9px;letter-spacing:.18em}.workspace-head h1{margin:10px 0 6px;font-size:clamp(30px,4vw,60px);line-height:.95}.workspace-head p{margin:0;color:var(--muted);font-size:13px}.toggle{display:flex;border:1px solid var(--gray);padding:3px;background:#fff}.toggle button{border:0;background:transparent;padding:9px 15px;cursor:pointer;text-transform:uppercase;font-size:9px;letter-spacing:.12em}.toggle .active{background:var(--black);color:#fff}.reader{margin:0 5vw 44px}.chapter{background:#fff;border:1px solid var(--line);padding:46px clamp(24px,4vw,70px) 60px;scroll-margin-top:88px;box-shadow:0 20px 45px rgba(0,0,0,.05)}.chapter+.chapter{margin-top:30px}.chapter-kicker{color:#77736f;font-size:9px;font-weight:700;letter-spacing:.18em}.chapter h1{margin:12px 0 8px;font-size:clamp(34px,4.2vw,64px);line-height:.98;text-transform:uppercase;letter-spacing:-.045em}.deck{margin:0 0 38px;color:var(--muted);font-size:15px}.lesson{width:100%;min-width:0;display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,.6fr);gap:clamp(34px,5vw,78px);align-items:start}.prose{min-width:0}.prose h2{margin:38px 0 12px;padding-top:24px;border-top:1px solid var(--line);font-size:18px;text-transform:uppercase}.prose h2:first-child{margin-top:0}.prose h3{margin:23px 0 7px;font-size:13px;text-transform:uppercase;letter-spacing:.08em}.prose>p{margin:0 0 17px;font:16px/1.72 Georgia,serif;color:#2b2a29}.step{display:grid;grid-template-columns:34px 1fr;gap:14px;margin:14px 0;padding:14px 16px;background:var(--paper);border-left:3px solid var(--pink)}.step b{color:#8d8984;font-size:9px;padding-top:4px}.step p{margin:0;font-size:14px;line-height:1.55}.chapter-link{display:block;width:100%;margin:10px 0;padding:12px 15px;border:0;background:var(--pink);font-size:10px;font-weight:800;text-align:left;text-transform:uppercase;cursor:pointer}.visual{width:100%;max-width:100%;min-width:0;position:sticky;top:90px;display:grid;gap:18px}.media,.placeholder{width:100%;max-width:100%;min-width:0;margin:0;overflow:hidden;border:1px solid var(--line);background:#fff}.media button{display:block;width:100%;padding:0;border:0;background:#fff;cursor:zoom-in}.media img{display:block;width:100%;height:auto}.media iframe{display:block;width:100%;max-width:100%;aspect-ratio:16/9;border:0}.media figcaption{padding:12px 14px;color:var(--muted);font-size:10px;line-height:1.4;text-transform:uppercase}.placeholder{min-height:260px;padding:24px;display:flex;flex-direction:column;justify-content:flex-end;border-style:dashed;background:#eeece9}.placeholder span{width:max-content;max-width:100%;padding:6px 8px;background:#111;color:#fff;font-size:8px}.placeholder strong,.placeholder p{max-width:100%;padding:8px;background:#fff;overflow-wrap:anywhere}.placeholder strong{margin-top:8px;font-size:14px;text-transform:uppercase}.placeholder p{margin:8px 0 0;font-size:11px}.icons{display:grid;gap:10px;margin-top:28px}.icon{display:grid;grid-template-columns:74px 1fr;gap:18px;align-items:center;padding:10px;border:1px solid var(--line);background:#faf9f7}.icon img{width:58px;height:58px;object-fit:contain}.icon h3{margin:0 0 5px;font-size:13px;text-transform:uppercase}.icon p{margin:0;font-size:12px;line-height:1.5}.index .lesson{grid-template-columns:1fr}.index .prose{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:10px}.index .chapter-link{margin:0}dialog{max-width:none;width:100vw;height:100vh;border:0;padding:70px 3vw 40px;background:rgba(0,0,0,.94)}dialog img{display:block;max-width:100%;margin:auto;background:#fff}dialog button{position:fixed;top:18px;right:22px;width:44px;height:44px;background:#111;color:#fff;border:1px solid #777;font-size:28px}@media(max-width:1000px){.topbar{height:64px}.menu{display:block;width:54px}.brand{width:auto;min-width:200px;height:64px;padding:0 12px;border:0}.rail{top:64px;transform:translateX(-100%);transition:.2s}.rail.open{transform:none}.workspace{margin-left:0;padding-top:64px}.status{display:none}}@media(min-width:1001px) and (max-width:1250px),(max-width:800px){.lesson{grid-template-columns:1fr}.visual{position:static}}@media(max-width:650px){.brand small{display:none}.brand{min-width:140px}.search{width:auto;flex:1;margin:0 10px 0 0}.workspace-head{padding:30px 18px 20px;display:block}.toggle{margin-top:20px;width:max-content}.reader{margin:0 0 28px}.chapter{padding:30px 18px 40px;border-left:0;border-right:0}.rail{width:min(352px,88vw)}}.brand>span{width:46px;height:46px}.brand b{font-size:17px}.brand small{font-size:11px;letter-spacing:.14em}.search input{font-size:15px}.status{font-size:11px}.rail-title{font-size:12px}.rail button>span{font-size:12px}.rail strong{font-size:14px;line-height:1.25}.rail small{font-size:12px;line-height:1.45;margin-top:5px}.workspace-head small{font-size:11px}.workspace-head p{font-size:16px}.toggle button{font-size:12px}.chapter-kicker{font-size:11px}.deck{font-size:17px;line-height:1.5}.prose h2{margin:30px 0 10px;padding-top:0;border-top:0;font-size:19px;letter-spacing:.035em}.prose h3{font-size:16px;line-height:1.35}.prose>p{margin-bottom:16px;font-size:17px;line-height:1.72}.step{display:block;margin:8px 0 8px 1.35rem;padding:0 0 0 1rem;background:transparent;border-left:2px solid var(--gray)}.step b{display:none}.step p{font:16px/1.65 Georgia,serif;color:#2b2a29}.chapter-link{font-size:13px}.media figcaption{font-size:12px}.icon h3{font-size:15px}.icon p{font-size:14px}.placeholder strong{font-size:16px}.placeholder p{font-size:14px}.rail button[data-category="pro-plan"]{background:#0b0b0b}.rail button[data-category="layout"]{background:#252525}.rail button[data-category="general"]{background:#3a3a3a}.rail button.active{filter:brightness(1.35)}.rail strong,.chapter h1{overflow-wrap:break-word}.index .prose{display:block}.index .prose>h2{margin:15px 0 6px;padding:9px 11px;color:#fff;font-size:15px;letter-spacing:.1em}.index .prose>h2[data-category="pro-plan"]{background:#0b0b0b}.index .prose>h2[data-category="layout"]{background:#252525}.index .prose>h2[data-category="general"]{background:#3a3a3a}.index .prose>p{margin-bottom:12px;font-size:16px;line-height:1.55}.index .index-link-group{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:6px}.index .chapter-link,.index .chapter-link[data-category]{display:block;width:100%;min-height:0;margin:0;padding:10px 11px;border:1px solid #d9d7d3;background:#fff;color:#0b0b0b;font-size:14px;line-height:1.25}.index .chapter-link:hover{background:#f0efed}.media.toolbar-scale{width:140px;justify-self:start}.media.toolbar-scale button{padding:14px}.media.toolbar-scale img{width:auto;max-width:72px;max-height:72px;margin:auto;object-fit:contain}.media.toolbar-highlight button{height:180px;position:relative;overflow:hidden}.media.toolbar-highlight img{position:absolute;width:510px;max-width:none;height:auto;left:calc(50% - 252px);top:-528px}.chapter.toolbar-icons .lesson{display:block}.chapter.toolbar-icons .icons{grid-template-rows:repeat(3,auto);grid-auto-flow:column;grid-auto-columns:92px;gap:8px;overflow-x:auto;padding:4px 2px 14px;scrollbar-color:var(--gray) transparent}.chapter.toolbar-icons .icon{display:block;min-height:102px;padding:8px 5px;text-align:center}.chapter.toolbar-icons .icon img{width:32px;height:32px;margin:0 auto 6px}.chapter.toolbar-icons .icon h3{margin:0;font-size:10px;line-height:1.2}.chapter.toolbar-icons .icon p{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}@media(max-width:650px){.chapter.toolbar-icons .icons{grid-auto-columns:84px}.chapter.toolbar-icons .icon h3{font-size:9px}}:root{--plan-bg:#fff3f5;--spec-bg:#f2faef;--layout-bg:#f0f7fc;--general-bg:#f7f2fb}.rail button,.rail button strong,.rail button small,.rail button>span{color:#111}.rail button[data-category="pro-plan"]{background:var(--plan-bg)}.rail button[data-category="spec-plan"]{background:var(--spec-bg)}.rail button[data-category="layout"]{background:var(--layout-bg)}.rail button[data-category="general"]{background:var(--general-bg)}.rail button:hover,.rail button.active{filter:brightness(.94)}.chapter[data-category="pro-plan"]{background:var(--plan-bg)}.chapter[data-category="spec-plan"]{background:var(--spec-bg)}.chapter[data-category="layout"]{background:var(--layout-bg)}.chapter[data-category="general"]{background:var(--general-bg)}.index .prose>h2{color:#111;border:1px solid #111}.index .prose>h2[data-category="pro-plan"]{background:var(--plan-bg)}.index .prose>h2[data-category="spec-plan"]{background:var(--spec-bg)}.index .prose>h2[data-category="layout"]{background:var(--layout-bg)}.index .prose>h2[data-category="general"]{background:var(--general-bg)}.index .chapter-link{font-family:Arial,Helvetica,sans-serif;font-size:14px;font-weight:700;letter-spacing:.08em;text-transform:uppercase}.lesson:has(.full-media){grid-template-columns:1fr}.visual:has(.full-media){position:static}.media.full-media{width:100%;max-width:100%}.menu:empty::after{content:"\2630"}.search span:empty::after{content:"\1F50D"}dialog button:empty::after{content:"\00D7"}
.lesson.no-sidebar{grid-template-columns:minmax(0,1fr)}.prose>.media{margin:24px 0 30px}.prose>.media.toolbar-scale{display:inline-block;vertical-align:top;margin:8px 10px 22px 0}.prose>.media.toolbar-highlight{width:min(100%,520px)}.media.narrow-media{width:min(100%,360px)}.media.natural-media{width:max-content;max-width:100%}.media.natural-media button{width:auto;max-width:100%}.media.natural-media img{width:auto;max-width:100%;height:auto}
/* Inline media keeps its source resolution: shrink when necessary, never enlarge. */
.prose>.media:not(.full-media):not(.video-media){width:max-content;max-width:100%}
.prose>.media:not(.full-media):not(.video-media)>button{width:max-content;max-width:100%}
.prose>.media:not(.full-media):not(.video-media) img{width:auto;max-width:100%;height:auto}
.prose>.media.video-media{width:min(100%,860px);max-width:100%;margin:24px 0 30px}
.prose>.media.video-media iframe{display:block;width:100%;max-width:100%;aspect-ratio:16/9;border:0}
.prose>.media.toolbar-highlight{width:280px!important;max-width:100%}
.prose>.media.toolbar-highlight>button{width:170px!important;max-width:none;height:100px;margin:0 auto;position:relative;overflow:hidden}
.prose>.media.toolbar-highlight img{position:absolute;width:170px!important;max-width:none;height:auto;left:0;top:-138px}
