*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0c0f14;--panel:#141a22;--panel2:#1b232d;--line:#28323f;
  --text:#e8edf3;--mut:#8b97a6;--dim:#5d6877;
  --blue:#3d9bff;--green:#34d399;--amber:#ffb02e;--red:#ff5e5e;--violet:#a78bfa;
  --r8:8px;--r12:12px;--sidebar-w:280px;
}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--text);
  font-family:'Inter','Helvetica Neue',Arial,sans-serif;
  font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;
}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
code{font-family:'Space Mono',monospace;background:var(--panel2);padding:2px 6px;border-radius:4px;font-size:.9em;color:var(--green)}

/* TOPBAR */
.topbar{position:fixed;top:0;left:0;right:0;z-index:200;height:56px;display:flex;align-items:center;justify-content:space-between;padding:0 20px;background:rgba(12,15,20,.96);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.logo{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:17px;color:var(--text)}
.logo span{color:var(--blue)}
.topbar-right{display:flex;align-items:center;gap:14px}
.topbar-right a{font-size:13px;color:var(--mut);border:1px solid var(--line);padding:6px 13px;border-radius:var(--r8)}
.topbar-right a:hover{color:var(--text);border-color:var(--mut);text-decoration:none}
.menu-btn{display:none;background:none;border:1px solid var(--line);color:var(--text);padding:6px 10px;border-radius:var(--r8);font-size:14px;cursor:pointer}

/* LAYOUT */
.layout{display:flex;padding-top:56px;min-height:100vh}
.sidebar{width:var(--sidebar-w);flex-shrink:0;border-right:1px solid var(--line);position:fixed;top:56px;bottom:0;left:0;overflow-y:auto;padding:22px 0 60px;background:var(--bg)}
.main{margin-left:var(--sidebar-w);flex:1;min-width:0;padding:44px 48px 100px;max-width:840px}

/* SIDEBAR NAV */
.nav-group{margin-bottom:4px}
.nav-sec-link{display:block;padding:9px 22px;font-weight:600;font-size:13.5px;color:var(--text);border-left:2px solid transparent}
.nav-sec-link:hover{background:var(--panel);text-decoration:none}
.nav-sec-link.active{border-left-color:var(--blue);color:var(--blue);background:var(--panel)}
.nav-sub{padding-left:36px;padding-right:14px}
.nav-sub a{display:block;padding:5px 0;font-size:12.5px;color:var(--dim)}
.nav-sub a:hover{color:var(--mut);text-decoration:none}
.nav-eyebrow{font-family:'Space Mono',monospace;font-size:10px;letter-spacing:.12em;color:var(--dim);text-transform:uppercase;padding:10px 22px 6px}

/* CONTENT TYPOGRAPHY */
.eyebrow{font-family:'Space Mono',monospace;font-size:11px;letter-spacing:.13em;color:var(--blue);text-transform:uppercase;margin-bottom:12px}
h1{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:clamp(28px,3.5vw,40px);letter-spacing:-.02em;line-height:1.15;margin-bottom:14px}
h1 + .lead{font-size:17px;color:var(--mut);max-width:640px;margin-bottom:40px;line-height:1.7}
h2{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:23px;letter-spacing:-.01em;margin:52px 0 14px;padding-top:8px;border-top:1px solid var(--line);scroll-margin-top:76px}
h2:first-of-type{border-top:none;margin-top:0}
h3{font-family:'Space Grotesk',sans-serif;font-weight:600;font-size:17px;margin:26px 0 10px;scroll-margin-top:76px}
p{color:#cdd6e0;margin-bottom:14px;max-width:680px}
ul,ol{color:#cdd6e0;margin:0 0 16px 22px;max-width:660px}
li{margin-bottom:7px}
strong{color:var(--text);font-weight:600}
.section-nav-prevnext{display:flex;justify-content:space-between;margin-top:64px;padding-top:20px;border-top:1px solid var(--line);font-size:13px}

/* CALLOUTS */
.tip,.warn,.img-ph{border-radius:var(--r8);padding:14px 16px;margin:18px 0;max-width:660px;font-size:14.5px;line-height:1.6}
.tip{background:rgba(52,211,153,.07);border-left:3px solid var(--green);color:#cdd6e0}
.tip strong{color:var(--green)}
.warn{background:rgba(255,176,46,.08);border-left:3px solid var(--amber);color:#cdd6e0}
.warn strong{color:var(--amber)}
.no{background:rgba(255,94,94,.07);border-left:3px solid var(--red);color:#cdd6e0}
.no strong{color:var(--red)}
.img-ph{border:1px dashed var(--line);background:var(--panel);color:var(--dim);text-align:center;padding:34px 16px;font-size:13px}
.img-ph::before{content:"🖼  ";}
.shot{display:block;width:100%;max-width:100%;height:auto;border-radius:var(--r12);border:1px solid var(--line);margin:18px 0}
.shot-narrow{max-width:420px}
.shot-medium{max-width:460px}
table{width:100%;max-width:680px;border-collapse:collapse;margin:16px 0 24px;font-size:13.5px}
th,td{text-align:left;padding:8px 12px;border-bottom:1px solid var(--line);color:#cdd6e0}
th{color:var(--mut);font-weight:600;font-family:'Space Mono',monospace;font-size:11px;letter-spacing:.05em;text-transform:uppercase}

/* TOC / INDEX PAGE */
.toc-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:2px;border:1px solid var(--line);border-radius:var(--r12);overflow:hidden;margin-top:36px}
.toc-card{background:var(--panel);padding:22px 22px 20px;transition:background .15s}
.toc-card:hover{background:var(--panel2)}
.toc-num{font-family:'Space Mono',monospace;font-size:11px;color:var(--dim);margin-bottom:8px}
.toc-t{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:17px;margin-bottom:6px}
.toc-d{font-size:13px;color:var(--mut);line-height:1.55}
.toc-card.stub{opacity:.55}
.toc-badge{display:inline-block;font-family:'Space Mono',monospace;font-size:9.5px;letter-spacing:.08em;text-transform:uppercase;padding:2px 7px;border-radius:4px;background:rgba(255,176,46,.12);color:var(--amber);margin-left:8px;vertical-align:middle}

/* STUB PAGE */
.stub-box{border:1px dashed var(--line);border-radius:var(--r12);padding:40px;text-align:center;color:var(--dim);max-width:660px;margin-top:30px}

/* MOBILE */
@media (max-width:920px){
  .sidebar{transform:translateX(-100%);transition:transform .2s;z-index:150;box-shadow:0 0 40px rgba(0,0,0,.5)}
  .sidebar.open{transform:translateX(0)}
  .main{margin-left:0;padding:36px 20px 80px}
  .menu-btn{display:inline-block}
}