:root{color-scheme:light;--bg:#f7f9fc;--surface:#fff;--surface2:#eef3f9;--ink:#1b2a3b;--sub:#536679;--edge:#dce5ee;--accent:#1761b0;--focus:#e0a400;--nav:#edf3fa;--shadow:0 8px 24px rgba(19,35,60,.05)}
:root[data-theme="dark"]{color-scheme:dark;--bg:#0b1422;--surface:#132033;--surface2:#1c2b40;--ink:#eaf2fa;--sub:#b1bfd1;--edge:#33465e;--accent:#8cbaff;--focus:#f6c64f;--nav:#122035;--shadow:none}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,"Segoe UI",system-ui,-apple-system,sans-serif;line-height:1.65;background:var(--bg);color:var(--ink)}
a{color:var(--accent);text-underline-offset:.18em}a:hover{text-decoration-thickness:2px}
a:focus-visible,button:focus-visible{outline:3px solid var(--focus);outline-offset:3px}
header{background:var(--surface);border-bottom:1px solid var(--edge);position:sticky;top:0;z-index:4}
.top{max-width:1360px;margin:auto;padding:13px 22px;display:flex;align-items:center;gap:22px;justify-content:space-between}
.brand{display:flex;align-items:center;gap:13px;min-width:0;text-decoration:none;color:var(--ink)}
.brand .word{font-size:1.37rem;font-weight:800;letter-spacing:.008em;white-space:nowrap}
.brand .sub{font-size:.77rem;color:var(--sub);border-left:1px solid var(--edge);padding-left:12px;white-space:nowrap}
.brand .brand-note{display:block;font-size:.62rem;color:var(--sub);font-weight:400}
.actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
button{border:1px solid var(--edge);background:var(--surface2);color:var(--ink);font:inherit;padding:7px 12px;border-radius:10px;cursor:pointer}
.layout{max-width:1360px;margin:0 auto;display:grid;grid-template-columns:242px minmax(0,1fr);gap:34px;padding:28px 22px 100px}
aside{position:sticky;top:86px;align-self:start;background:var(--nav);border:1px solid var(--edge);border-radius:15px;padding:20px}
aside a{display:block;padding:7px 9px;border-radius:8px;text-decoration:none;font-size:.9rem}aside a:hover,aside a[aria-current="page"]{background:var(--surface2);font-weight:700}
aside h2{font-size:.76rem;letter-spacing:.1em;text-transform:uppercase;color:var(--sub);margin:17px 8px 5px}
main{min-width:0}main>article{background:var(--surface);border:1px solid var(--edge);border-radius:18px;padding:clamp(22px,4vw,48px);box-shadow:var(--shadow)}
h1{font-size:clamp(1.75rem,2.7vw,2.7rem);line-height:1.16;letter-spacing:-.035em;margin:.3em 0 .6em}
h2{line-height:1.3;letter-spacing:-.015em;margin:2.2rem 0 .7rem;font-size:1.35rem}h3{margin:1.5rem 0 .5rem;font-size:1.08rem}
p{max-width:83ch}.lead{font-size:1.13rem;color:var(--sub);max-width:72ch}.eyebrow{font-size:.75rem;letter-spacing:.13em;font-weight:800;color:var(--accent);text-transform:uppercase}
.meta{display:flex;gap:10px;flex-wrap:wrap;margin:1rem 0 1.6rem}.pill{border:1px solid var(--edge);border-radius:999px;padding:3px 10px;font-size:.79rem;background:var(--surface2)}
.notice{border-left:4px solid var(--accent);background:var(--surface2);border-radius:0 10px 10px 0;padding:13px 16px;margin:18px 0}
.notice strong{display:block}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:15px}
.tile{border:1px solid var(--edge);border-radius:14px;padding:18px;background:var(--surface)}
.tile h2,.tile h3{margin:0 0 8px}.tile p{margin:0 0 12px;color:var(--sub);font-size:.91rem}
table{border-collapse:collapse;width:100%;font-size:.9rem;margin:1rem 0 1.6rem}th,td{text-align:left;border-bottom:1px solid var(--edge);padding:12px;vertical-align:top}th{background:var(--surface2)}.scroll{overflow-x:auto}
pre{background:var(--surface2);border:1px solid var(--edge);padding:18px;border-radius:12px;white-space:pre-wrap;overflow-wrap:anywhere}
ul,ol{padding-left:1.4rem}li{padding-bottom:.33rem}.muted,.fine{color:var(--sub)}.fine{font-size:.83rem}
footer{margin:22px 0;text-align:left;color:var(--sub);font-size:.8rem}
@media(max-width:880px){.layout{display:block;padding:14px 12px 75px}aside{position:static;margin-bottom:15px}main>article{padding:23px}.brand .sub{display:none}.top{padding:10px 12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* Phase-aware documentation shell · October 2026 */
.top{min-height:76px}
.brand-logo{display:block;width:183px;height:auto;max-height:52px;object-fit:contain;object-position:left center}
:root[data-theme="dark"] .brand-logo{filter:brightness(0) invert(1)}
.actions{flex-shrink:0;gap:8px}
.icon-button{width:42px;height:42px;display:inline-flex;align-items:center;justify-content:center;background:transparent;color:var(--ink);border:1px solid var(--edge);border-radius:12px;padding:0;text-decoration:none;transition:background-color .14s ease,border-color .14s ease}
.icon-button:hover{background:var(--surface2);border-color:var(--accent)}
.icon-button svg{display:block}
:root[data-theme="light"] .icon-sun{display:none}
:root[data-theme="dark"] .icon-moon{display:none}
aside{padding:16px}
aside h2{margin:15px 10px 8px}
.nav-accordion{margin:4px 0;border:1px solid var(--edge);border-radius:12px;overflow:hidden;background:var(--surface)}
.nav-accordion summary{list-style:none;display:flex;align-items:center;gap:10px;padding:11px 12px;cursor:pointer;font-weight:700;user-select:none;outline-offset:-3px}
.nav-accordion summary::-webkit-details-marker{display:none}
.nav-accordion summary:hover{background:var(--surface2)}
.nav-accordion summary:focus-visible{outline:3px solid var(--focus)}
.nav-folder{color:var(--accent);font-size:1.3rem;line-height:1}
.nav-chevron{margin-left:auto;font-size:1.24rem;line-height:1;transition:transform .16s ease}
.nav-accordion:not([open]) .nav-chevron{transform:rotate(-90deg)}
.nav-children{padding:0 8px 10px 12px;display:grid;gap:1px}
.nav-children a{padding:7px 9px 7px 14px;border-left:2px solid transparent;border-radius:5px;color:var(--sub);font-size:.87rem;line-height:1.42}
.nav-children a:hover{background:var(--surface2);color:var(--ink)}
.nav-children a[aria-current="page"]{color:var(--accent);border-left-color:var(--accent);background:var(--surface2);font-weight:700}
@media(max-width:880px){.top{min-height:65px}.brand-logo{width:140px}.actions{gap:6px}.icon-button{width:38px;height:38px}aside{padding:12px}}
@media(prefers-reduced-motion:reduce){.icon-button,.nav-chevron{transition:none}}

/* UI v2: resilient icon-only controls, and dark-mode reversal of the supplied black wordmark. */
:root[data-theme="light"] .brand-logo{filter:none!important}
:root[data-theme="dark"] .brand-logo{filter:brightness(0) invert(1)!important}
#theme-toggle{display:inline-flex;align-items:center;justify-content:center;min-width:40px;min-height:40px;padding:8px;line-height:1;white-space:nowrap}
#theme-toggle svg{display:block;width:20px;height:20px;flex:none}
:root[data-theme="light"] #theme-toggle .icon-sun{display:none}
:root[data-theme="dark"] #theme-toggle .icon-moon{display:none}
.nav-accordion summary{list-style:none;display:flex;align-items:center;gap:0}
.nav-accordion summary::marker{content:""}
.nav-accordion summary::-webkit-details-marker{display:none}
.nav-accordion summary .nav-folder,.nav-accordion summary .nav-chevron{display:none!important}