/* Site chrome: header, nav pills, orbs, buttons, mobile sheet, footer.
   Reference: design/design-system/ui_kits/blog/Chrome.jsx + components/actions/*. */

@keyframes rd-chase{to{--rd-angle:360deg}}

/* ---------- Icons ---------- */
.icon{width:var(--icon,16px);height:var(--icon,16px);display:block;flex:none}

/* ---------- Wordmark ---------- */
.wordmark{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--fg-1);white-space:nowrap;min-width:0}
.wordmark__mark{width:27px;height:27px;flex:none;
  -webkit-mask:url(../images/logo-mask.svg) center/contain no-repeat;mask:url(../images/logo-mask.svg) center/contain no-repeat;
  background:conic-gradient(from 200deg,#fff,#8b8e96 12%,#3D6BFF 20%,#2c2e33 30%,#e6e7ea 42%,#A884FF 52%,#5b5e66 60%,#F08A4B 70%,#fff 80%,#2c2e33 90%,#fff)}
.wordmark__text{font:var(--fw-display) 20px/1 var(--font-display);letter-spacing:var(--tracking-display)}
.wordmark--lg .wordmark__mark{width:32px;height:32px}
.wordmark--lg .wordmark__text{font-size:24px}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:50;background:rgba(6,7,9,.72);-webkit-backdrop-filter:var(--blur-glass);backdrop-filter:var(--blur-glass);border-bottom:1px solid var(--border-subtle)}
.site-header__inner{max-width:var(--container-wide);margin:0 auto;padding:14px var(--gutter);display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:24px}
.site-header__actions{display:flex;justify-content:flex-end;align-items:center;gap:10px}

/* ---------- Nav pills ---------- */
.site-nav{position:relative;justify-self:center;display:flex;padding:4px;border-radius:var(--radius-pill);background:var(--surface-card);box-shadow:inset 0 0 0 1px var(--border-subtle)}
.site-nav .nav{list-style:none;margin:0;padding:0;display:flex;gap:2px;position:relative}
.site-nav__indicator{position:absolute;top:4px;bottom:4px;left:0;width:0;opacity:0;border-radius:var(--radius-pill);background:var(--ink-0);box-shadow:inset 0 0 0 1px var(--border-strong),0 6px 18px -8px rgba(0,0,0,.9);transition:left var(--dur-slow) var(--ease-out),width var(--dur-slow) var(--ease-out);view-transition-name:nav-indicator}
.nav-pill{position:relative;z-index:1;display:inline-flex;align-items:center;gap:10px;height:40px;padding:0 16px;border-radius:var(--radius-pill);text-decoration:none;font-family:var(--font-sans);font-size:14px;font-weight:var(--fw-medium);letter-spacing:-0.01em;color:var(--fg-3);transition:color var(--dur-fast)}
.nav-pill--current{padding:0 18px 0 4px;color:var(--fg-1)}
.nav-pill:hover{color:var(--fg-1)}
/* hover = spectral rim, never chrome */
.nav-pill:not(.nav-pill--current)::before{content:"";position:absolute;inset:0;border-radius:inherit;padding:var(--rim);background:conic-gradient(from var(--rd-angle),#ffffff,#8b8e96 12%,#3D6BFF 20%,#2c2e33 30%,#e6e7ea 42%,#A884FF 52%,#5b5e66 60%,#F08A4B 70%,#ffffff 80%,#2c2e33 90%,#ffffff);-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:opacity var(--dur-base) var(--ease-out);pointer-events:none}
.nav-pill:not(.nav-pill--current):hover::before{opacity:1}
.nav-pill__orb{width:32px;height:32px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;background:var(--metal-face);box-shadow:0 0 14px -4px rgba(168,132,255,.6);color:var(--ink-800);--icon:15px}
.nav-pill__orb .icon{stroke-width:2}

/* ---------- Orbs (icon buttons) ---------- */
.orb{position:relative;width:40px;height:40px;border-radius:50%;border:0;padding:0;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;flex:none;background:var(--metal-face);box-shadow:var(--shadow-metal);color:var(--fg-3);text-decoration:none;--icon:16px;transition:transform var(--dur-fast) var(--ease-out),color var(--dur-fast)}
.orb::after{content:"";position:absolute;inset:0;border-radius:50%;background:var(--metal-sheen);pointer-events:none}
.orb .icon{position:relative;z-index:2}
.orb .icon--brand{--icon:15px}
.orb:hover{color:var(--fg-1)}
.orb:hover::before{background:conic-gradient(from var(--rd-angle),#ffffff,#8b8e96 12%,#3D6BFF 20%,#2c2e33 30%,#e6e7ea 42%,#A884FF 52%,#5b5e66 60%,#F08A4B 70%,#ffffff 80%,#2c2e33 90%,#ffffff);animation:rd-chase 9s linear infinite}
.orb:active{transform:scale(.94)}

/* ---------- Buttons ---------- */
.btn{position:relative;display:inline-flex;align-items:center;justify-content:center;gap:10px;height:46px;padding:0 22px;border-radius:var(--radius-pill);border:0;cursor:pointer;font-family:var(--font-sans);font-size:15px;font-weight:var(--fw-medium);letter-spacing:-0.01em;text-decoration:none;white-space:nowrap;overflow:hidden;transition:transform var(--dur-fast) var(--ease-out),box-shadow var(--dur-base) var(--ease-out),background var(--dur-base) var(--ease-out),color var(--dur-fast)}
.btn--sm{height:36px;padding:0 16px;font-size:14px}
.btn:active{transform:scale(.97)}
.btn--ghost{background:transparent;color:var(--fg-1);box-shadow:inset 0 0 0 1px var(--border-default)}
.btn--ghost:hover{background:var(--surface-hover)}
.btn--spectral{background:var(--metal-face);color:var(--ink-1000);font-weight:var(--fw-semibold);box-shadow:var(--shadow-metal),0 0 16px -8px rgba(168,132,255,.6)}
.btn--spectral:hover{box-shadow:var(--shadow-metal),0 0 22px -6px rgba(168,132,255,.75)}
.btn--spectral::after{content:"";position:absolute;inset:0;border-radius:inherit;background:var(--metal-sheen);pointer-events:none}

/* ---------- Menu orb + sheet (≤960px only) ---------- */
.menu-orb{display:none;transition:transform var(--dur-slow) var(--ease-spring),color var(--dur-fast)}
.menu-orb .icon--close{display:none}
.menu-orb[aria-expanded="true"]{transform:rotate(90deg);color:var(--fg-1)}
.menu-orb[aria-expanded="true"] .icon--menu{display:none}
.menu-orb[aria-expanded="true"] .icon--close{display:block}

.site-sheet{display:none;position:absolute;left:0;right:0;top:100%;height:calc(100dvh - 100%);overflow-y:auto;background:rgba(6,7,9,.98);-webkit-backdrop-filter:var(--blur-glass);backdrop-filter:var(--blur-glass);opacity:0;clip-path:inset(0 0 100% 0);pointer-events:none;transition:opacity 260ms var(--ease-in-out) 120ms,clip-path 380ms var(--ease-in-out) 120ms}
.site-sheet[aria-hidden="false"]{opacity:1;clip-path:inset(0 0 0 0);pointer-events:auto;transition:opacity 200ms var(--ease-out),clip-path 560ms var(--ease-out)}
.site-sheet__line{position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,var(--violet-500) 30%,var(--ember-500) 70%,transparent);opacity:0;transform:scaleX(.2);transition:opacity 420ms var(--ease-out),transform 720ms var(--ease-out)}
.site-sheet[aria-hidden="false"] .site-sheet__line{opacity:.7;transform:scaleX(1)}
.site-sheet__nav{display:grid;padding:12px var(--gutter) 40px}
.site-sheet .nav{list-style:none;margin:0;padding:0;display:grid}
.site-sheet .nav-pill{display:flex;justify-content:space-between;height:auto;padding:20px 0;border-radius:0;font:var(--fw-display) 32px/1 var(--font-display);letter-spacing:var(--tracking-heading);color:var(--fg-3);opacity:0;filter:blur(3px);transform:translateY(12px);transition:opacity 160ms var(--ease-in-out),transform 220ms var(--ease-in-out),filter 160ms var(--ease-in-out)}
.site-sheet .nav-pill::before{display:none}
.site-sheet .nav-pill::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:var(--border-subtle);transform-origin:left;transform:scaleX(0);transition:transform 200ms var(--ease-out)}
.site-sheet .nav-pill--current{color:var(--fg-1)}
.site-sheet .nav-pill__orb{order:2;width:10px;height:10px;--icon:0px;box-shadow:0 0 12px rgba(168,132,255,.7);transform:scale(0);transition:transform 160ms var(--ease-in-out)}
.site-sheet .nav-pill__orb .icon{display:none}
.site-sheet[aria-hidden="false"] .nav-pill{opacity:1;filter:none;transform:none;transition:opacity 320ms var(--ease-out) calc(90ms + var(--i,0)*45ms),transform 560ms var(--ease-out) calc(90ms + var(--i,0)*45ms),filter 360ms var(--ease-out) calc(90ms + var(--i,0)*45ms)}
.site-sheet[aria-hidden="false"] .nav-pill::after{transform:scaleX(1);transition:transform 640ms var(--ease-out) calc(150ms + var(--i,0)*45ms)}
.site-sheet[aria-hidden="false"] .nav-pill__orb{transform:scale(1);transition:transform 520ms var(--ease-spring) calc(270ms + var(--i,0)*45ms)}
.site-sheet__actions{display:grid;gap:12px;margin-top:32px;opacity:0;transform:translateY(10px);transition:opacity 140ms var(--ease-in-out),transform 200ms var(--ease-in-out)}
.site-sheet[aria-hidden="false"] .site-sheet__actions{opacity:1;transform:none;transition:opacity 360ms var(--ease-out) 360ms,transform 560ms var(--ease-out) 360ms}
.site-sheet__actions .btn{width:100%}
html[data-sheet] body{overflow:hidden}

/* ---------- Footer ---------- */
.site-footer{border-top:1px solid var(--border-subtle);margin-top:120px}
.site-footer__inner{max-width:var(--container-wide);margin:0 auto;padding:56px var(--gutter) 40px;display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:48px}
.site-footer__brand{display:grid;gap:16px;align-content:start;justify-items:start}
.site-footer__tagline{margin:0;max-width:440px;font-size:15px;line-height:1.55;color:var(--fg-3);text-wrap:pretty}
.site-footer__social{display:flex;justify-content:flex-end;align-items:flex-start;gap:8px}
.site-footer__meta{grid-column:1/-1;display:flex;justify-content:space-between;gap:16px;padding-top:24px;border-top:1px solid var(--border-subtle);font:500 11px/1 var(--font-mono);letter-spacing:.14em;text-transform:uppercase;color:var(--fg-4)}
.site-footer__meta a{color:inherit;text-decoration:none}
.site-footer__meta a:hover{color:var(--fg-2)}

/* ---------- Breakpoints ---------- */
@media (max-width:1100px){
  .site-header__signin{display:none}
}
@media (max-width:960px){
  .site-header__inner{grid-template-columns:minmax(0,1fr) auto;gap:12px}
  .site-nav,.site-header__subscribe{display:none}
  .menu-orb{display:inline-flex}
  .site-sheet{display:block}
  .wordmark__text{font-size:18px}
  .wordmark__mark{width:24px;height:24px}
}
@media (max-width:760px){
  .site-footer{margin-top:72px}
  .site-footer__inner{grid-template-columns:minmax(0,1fr);gap:24px;padding-top:40px}
  .site-footer__social{justify-content:flex-start}
  .site-footer__meta{flex-wrap:wrap;row-gap:16px}
}

/* ---------- Cross-page nav indicator glide (View Transitions, progressive) ---------- */
@view-transition{navigation:auto}
::view-transition-old(root),::view-transition-new(root){animation:none;mix-blend-mode:normal}
::view-transition-group(nav-indicator){animation-duration:var(--dur-slow);animation-timing-function:var(--ease-out)}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  .orb:hover::before,.btn--spectral::before,.rd-rim--spin::before{animation:none!important}
  .site-nav__indicator,.site-sheet,.site-sheet *,.menu-orb{transition:none!important}
  ::view-transition-group(nav-indicator){animation:none}
}