:root{--master-bg:color-mix(in srgb,var(--bg) 94%,var(--accent) 6%);--master-shadow:0 16px 50px rgba(15,23,42,.12);--master-radius:20px}
html{scroll-padding-top:92px}body{min-height:100vh}.shell{max-width:1280px}.topbar{z-index:100}.topbar .inner{max-width:1280px}.brand{display:flex;align-items:center;gap:.6rem}.brand::before{content:"EE";display:grid;place-items:center;width:32px;height:32px;border-radius:10px;background:linear-gradient(135deg,var(--accent),#7c3aed);color:#fff;font-size:.75rem;letter-spacing:.04em}
.master-nav{position:sticky;top:61px;z-index:90;background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}.master-nav-inner{max-width:1280px;margin:auto;padding:8px 24px;display:flex;gap:7px;align-items:center;overflow-x:auto;scrollbar-width:thin}.master-nav a{white-space:nowrap;text-decoration:none;color:var(--text);font-size:.86rem;font-weight:700;padding:7px 10px;border-radius:10px}.master-nav a:hover,.master-nav a:focus{background:var(--soft);color:var(--accent)}.master-nav .master-home{background:var(--accent);color:#fff}.master-search{margin-left:auto;min-width:210px;padding:7px 10px;border:1px solid var(--line);border-radius:10px;background:var(--panel);color:var(--text)}
.master-breadcrumb{max-width:1280px;margin:14px auto 0;padding:0 24px;color:var(--muted);font-size:.86rem}.master-breadcrumb a{color:var(--accent);text-decoration:none}.master-progressbar{height:3px;position:fixed;top:0;left:0;z-index:150;width:0;background:linear-gradient(90deg,var(--accent),#7c3aed);transition:width .1s linear}
.card,.chapter,.callout{transition:transform .16s ease,border-color .16s ease,box-shadow .16s ease}.card:hover{border-color:color-mix(in srgb,var(--accent) 55%,var(--line));box-shadow:var(--master-shadow)}.grid{gap:18px}.hero{align-items:center}.lead{line-height:1.75}.eyebrow{display:inline-flex;align-items:center;gap:.4rem}.eyebrow::before{content:"";width:24px;height:2px;background:var(--accent)}
pre{position:relative;white-space:pre;overflow-x:auto;tab-size:4;border:1px solid #263247;box-shadow:inset 0 1px 0 rgba(255,255,255,.04)}pre code{white-space:pre}.code-copy{position:absolute;top:8px;right:8px;border:1px solid #43516a;background:#172033;color:#dce8ff;border-radius:8px;padding:5px 8px;font-size:.72rem;cursor:pointer}.code-copy:hover{background:#243249}.code-language{position:absolute;top:10px;left:12px;color:#93a4be;font-size:.69rem;text-transform:uppercase;letter-spacing:.08em}pre.has-code-tools{padding-top:42px}
.didactic-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:20px 0}.didactic-chip{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:12px}.didactic-chip strong{display:block;color:var(--accent);font-size:.82rem;text-transform:uppercase;letter-spacing:.05em}.senior-note,.exam-note,.memory-note{padding:14px 16px;border-radius:12px;margin:16px 0;background:var(--soft);border-left:4px solid var(--accent)}.senior-note{border-left-color:#7c3aed}.exam-note{border-left-color:#d97706}.memory-note{border-left-color:#059669}
.master-hub{padding:34px 0}.master-hub-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}.hub-card{display:block;text-decoration:none;color:inherit;min-height:180px}.hub-card .icon{font-size:1.8rem}.hub-card p{color:var(--muted)}.path-steps{counter-reset:path;display:grid;gap:12px}.path-step{counter-increment:path;display:grid;grid-template-columns:44px 1fr;gap:14px;align-items:start;padding:16px;border:1px solid var(--line);border-radius:16px;background:var(--panel)}.path-step::before{content:counter(path);display:grid;place-items:center;width:38px;height:38px;border-radius:50%;background:var(--accent);color:#fff;font-weight:800}.map-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:18px}.map-card svg{width:100%;height:auto;min-height:210px}.map-card svg text{fill:var(--text)}.map-card svg rect{fill:var(--soft);stroke:var(--accent)}
.master-footer{max-width:1280px;margin:40px auto 0;padding:24px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;color:var(--muted)}.master-footer a{color:var(--accent)}
@media(max-width:900px){.master-nav{top:57px}.master-nav-inner{padding:8px 16px}.master-search{display:none}.didactic-strip{grid-template-columns:1fr 1fr}.master-breadcrumb{padding:0 16px}}
@media(max-width:600px){.didactic-strip{grid-template-columns:1fr}.topbar .nav a:not(:first-child){display:none}.master-nav-inner{gap:3px}.master-nav a{font-size:.8rem;padding:7px 8px}.shell{padding:16px}.card{border-radius:15px;padding:17px}h1{font-size:clamp(2rem,11vw,3rem)}}
@media print{.topbar,.master-nav,.master-progressbar,.code-copy{display:none!important}.shell{max-width:none}.card{box-shadow:none;break-inside:avoid}}