feat(navbar): match head shows the other gym's brand, centred logo on CrossFit, mobile band

The match head is painted in the other gym's colours with a strip in this site's accent; below 992px it is a slashed band at the bottom of the open menu (menu height from the real header height). The CrossFit page gets the centred logo crossfade, the hero logo has a fixed 52px height, and the hero h1 shadow is softer with the frosted blur at .8.

CLAUDE.md

@@ -79,7 +79,7 @@ Since 2026-09-25, one install serves several physical gyms: the `gyms` table, on
 folder per gym (`/3070/`, `/<postal-code>/`), content rows carry `gym_id`, and the
 backoffice has an "a editar" gym switcher (`admin_gym_id()` /
 `admin_gym()` in `config/functions_gyms.php`). `/` and `/home` 301 to the default gym (`is_default`); the other published gyms appear as highlighted buttons (`.gym-switch-btn`) at the right end of the public navbar (`site/includes/navbar.php`). `site/gym_chooser.php` is no longer used.
-Each gym has a brand colour (`gyms.brand_color`, `#RRGGBB`, migration `migration_20261013_gym_brand_color.sql`; gym 1 = green `#C2D500`, gym 2 = red): set in Gestão → Ginásios, emitted as `:root` overrides by `gym_brand_css()` in `site/includes/include.php`. New components must use `--fitme-accent*` / `--fitme-on-accent`, never a hard-coded colour; the CrossFit nav pill follows the brand colour too. The public navbar's bottom edge is an always-on, slow (14s) sweep in the brand colour (`.header-section::before/::after`, `nav-sweep`, static with reduced motion). On the home page (`$nav_center_logo` set in `site/index.php`, shared by `_open.php`) the header starts taller (desktop >= 992px) with a second, big (180px) copy of the logo centred (`.navbar-brand-hero`, `aria-hidden`); once `scrollY >= 40` (script in `navbar.php` toggles `.is-top`) the bar shrinks, the big logo fades out and the 150px left logo fades in (opacity crossfade, no movement). The hero gets `padding-top: 120px` on desktop so its event card clears the tall bar. On desktop the brand is absolute at the left and the links are centred on the full bar width; nav padding and logo width live in CSS, not inline. The other-gym buttons (`.gym-switch`) sit in the **match head**: an absolute dark block at the right end of the bar (full bar height, width follows its buttons), its left side cut on the brand slash (22px) with a 5px accent strip and an ember glow (`.gym-switch::before/::after`); logos inside it are lightness-flipped (`invert(1) hue-rotate(180deg)`) so dark lettering reads on the dark head. 992-1199px: links shrink (`.8125rem`, `--bs-navbar-nav-link-padding-x: .35rem`) so the 3070 menu clears the logo and head. Menu links are `.875rem` bold. Below 992px the open menu fills the screen under the bar (absolute, `100dvh - 60px`, links/buttons centred, opacity fade; not `position:fixed` because the header's backdrop-filter is its containing block). The bar is liquid glass in Chromium: `backdrop-filter: url(#nav-glass) blur(6px) saturate(180%)` (`#nav-glass` in `include.php`: blurred low-frequency `feTurbulence` -> `feDisplacementMap`, bends the page behind it), gated by `@supports (-webkit-app-region: drag)` (Chromium-only property); Safari/Firefox keep the plain blur. **Brand slash template:** the cut corners of the "in" box are one rule in `style.css` ("Brand slash (template)"): `class="fx-slash"` (both ends) or `fx-slash-start` (left only), size via `--slash` (default 4px); pseudo-elements are added to that rule's selector list. Used by the nav and section-title underlines and the CrossFit pill (`--slash: 8px`, no radius); never paste the polygon again. The hero subtitle (`.hero-text h1 span`, gym `hero_subtitle`) is a block strapline at `.42em` of the h1, tracked out. Logos (`.navbar-brand img`, `.gym-switch-logo`) get the same `#pt-noise` grain filter as h1/h2, and `.hero-event-go`, `.cta-btn`, `.btn-primary` joined the `--noise` button list. Section-title underlines (`.section-title.deco h2:after`) use the same slashed 4px bar as the nav underline. The hero event button text uses `--fitme-on-accent` (white on red). The nav underline (`.nav-link:after`) is a 4px bar 3px under the text with slashed ends (`clip-path`, like the "in" box of the FitMe in logo). The hero event card (`.hero-event`) is square (no radius on card, badge or button), taller (88px min) and has a defocus gradient: `::after` is a `backdrop-filter: blur()` layer masked left->right, sharp on the left and most blurred on the right; the card itself must not get filter/backdrop-filter/opacity/mask or the blur stops reaching the hero photo. Each gym can have a `logo` (same migration, plus `migration_20261026_gym_logo.sql`: the column was added to the 2026-10-13 file after it had already run on dev, so dev had no `logo` column until 2026-10-26 — never edit a migration that has run, add a new one); the header image and the logo are uploaded in Gestão → Ginásios (`gyms_save_image()` → `uploads/gyms/`, validated by content, SVG through `svg_is_safe()`), not typed as paths; `db_gyms_create/update` skip `brand_color`/`logo` while the migration isn't applied (`_gyms_cols()`); the navbar button for another gym is drawn in that gym's brand colour (`gym_brand_vars()` inline); with a logo (`gym_logo()`: the gym's own, or for the default gym the bundled `logo_black.svg`) the button shows the logo in full colour straight on the frosted navbar, with no face and no darkening on hover (`.gym-switch-btn--logo`: thin brand outline, hover = spinning ring only, no glow, a thin dark `drop-shadow` outline on the image for contrast (a white halo washed out the lime FitMe 3070 logo); name as alt), without one it shows the name. The navbar brand on each gym's page uses that gym's logo too. Uploads (header + logo) also accept JPEG XL (`.jxl`, detected by signature in `upload_image_ext()` when the caller allows `'jxl'`; the gyms form and gallery photos (`db_gallery_image_upload()`) do; `AddTyLine truncated
+Each gym has a brand colour (`gyms.brand_color`, `#RRGGBB`, migration `migration_20261013_gym_brand_color.sql`; gym 1 = green `#C2D500`, gym 2 = red): set in Gestão → Ginásios, emitted as `:root` overrides by `gym_brand_css()` in `site/includes/include.php`. New components must use `--fitme-accent*` / `--fitme-on-accent`, never a hard-coded colour; the CrossFit nav pill follows the brand colour too. The public navbar's bottom edge is an always-on, slow (14s) sweep in the brand colour (`.header-section::before/::after`, `nav-sweep`, static with reduced motion). On the home page and the CrossFit page (`$nav_center_logo` set in `site/index.php` / `site/crossfit.php`, shared by `_open.php`; the CrossFit video header no longer prints its own logo, only a `visually-hidden` h1) the header starts taller (desktop >= 992px) with a second, big copy of the logo centred (fixed 52px height, so tall logos like the CrossFit one clear the links) (`.navbar-brand-hero`, `aria-hidden`); once `scrollY >= 40` (script in `navbar.php` toggles `.is-top`) the bar shrinks, the big logo fades out and the 150px left logo fades in (opacity crossfade, no movement). The hero gets `padding-top: 120px` on desktop so its event card clears the tall bar. On desktop the brand is absolute at the left and the links are centred on the full bar width; nav padding and logo width live in CSS, not inline. The other-gym buttons (`.gym-switch`) sit in the **match head**, a glimpse into the other site: painted in the first other gym's brand (`navbar.php` puts `gym_brand_vars()` of `$other_gyms[0]` on `.gym-switch`), its accent as the face with a shadow inside the cut, a 5px strip in THIS site's accent on the slash (`--site-accent`, resolved on `.header-section` before the inline vars swap `--fitme-accent`), and its logo in that gym's on-accent ink (`brightness(0)`, plus `invert(1)` with `.gym-switch--light-ink` when the on-accent is white). Paint is shared; geometry per breakpoint: desktop = absolute block at the right end of the bar (full height, width follows its buttons), left side cut on the brand slash (22px); below 992px = a full-width band across the bottom of the open menu, top edge slashed (18px). 992-1199px: links shrink (`.8125rem`, `--bs-navbar-nav-link-padding-x: .35rem`) so the 3070 menu clears the logo and head. Menu links are `.875rem` bold. Below 992px the open menu fills the screen under the bar (absolute, `100dvh - var(--nav-h)`, `--nav-h` = the header's real height, set by the `navbar.php` script, links/buttons centred, opacity fade; not `position:fixed` because the header's backdrop-filter is its containing block). The bar is liquid glass in Chromium: `backdrop-filter: url(#nav-glass) blur(6px) saturate(180%)` (`#nav-glass` in `include.php`: blurred low-frequency `feTurbulence` -> `feDisplacementMap`, bends the page behind it), gated by `@supports (-webkit-app-region: drag)` (Chromium-only property); Safari/Firefox keep the plain blur. **Brand slash template:** the cut corners of the "in" box are one rule in `style.css` ("Brand slash (template)"): `class="fx-slash"` (both ends) or `fx-slash-start` (left only), size via `--slash` (default 4px); pseudo-elements are added to that rule's selector list. Used by the nav and section-title underlines and the CrossFit pill (`--slash: 8px`, no radius); never paste the polygon again. The hero h1 shadow is soft (`0 1px 3px .3`, `0 2px 18px .18`) and the hero frosted-band blur (`.hero-section .container::before`) is at opacity .8. The hero subtitle (`.hero-text h1 span`, gym `hero_subtitle`) is a block strapline at `.42em` of the h1, tracked out. Logos (`.navbar-brand img`, `.gym-switch-logo`) get the same `#pt-noise` grain filter as h1/h2, and `.hero-event-go`, `.cta-btn`, `.btn-primary` joined the `--noise` button list. Section-title underlines (`.section-title.deco h2:after`) use the same slashed 4px bar as the nav underline. The hero event button text uses `--fitme-on-accent` (white on red). The nav underline (`.nav-link:after`) is a 4px bar 3px under the text with slashed ends (`clip-path`, like the "in" box of the FitMe in logo). The hero event card (`.hero-event`) is square (no radius on card, badge or button), taller (88px min) and has a defocus gradient: `::after` is a `backdrop-filter: blur()` layer masked left->right, sharp on the left and most blurred on the right; the card itself must not get filter/backdrop-filter/opacity/mask or the blur stops reaching the hero photo. Each gym can have a `logo` (same migration, plus `migration_20261026_gym_logo.sql`: the column was added to the 2026-10-13 file after it had already run on dev, so dev had no `logo` column until 2026-10-26 — never edit a migration that has run, add a new one); the header image and the logo are uploaded in Gestão → Ginásios (`gyms_save_image()` → `uploads/gyms/`, validated by content, SVG through `svg_is_safe()`), not typed as paths; `db_gyms_create/update` skip `brand_color`/`logo` while the migration isnLine truncated
 An unpublished gym 404s publicly but previews for staff.
 
 ## Imagens / JPEG XL (2026-10-26)