/* ============================================================
   ARECH Megamenu block — front-end styles.

   Port of the NAV system in
     prototypes/navbar-explore-2026-05-19/nav-4-megamenu-full.html
   re-tokenized to the theme tokens (main.css :root) and corrected to the
   responsive standard (responsive_manual_en_0.1: min-width ONLY, no
   max-width media queries; canonical container box).

   ALL rules are scoped under `.arech-megamenu` so nothing leaks into the
   theme. The bar links sit inline next to the theme logo (the theme <header>
   provides the sticky surface + blur); only the panels / scrim / overlay are
   position:fixed and anchored at top:var(--header-height).
   ============================================================ */

.arech-megamenu {
    /* slots inline inside the theme's <header> flex row */
    display: contents;
}

/* -------- DESKTOP LINKS -------- */
.arech-megamenu .arech-mm__links {
    display: none;
    flex: 1;
    justify-content: center;
    align-items: center;
    /* Restore the prototype invariant (nav above scrim). The trigger cluster
       shares the .site-header stacking context with the scrim/panel; without a
       local z-index the triggers (z-index:auto) fall under the scrim (z-98).
       position:relative + z-index here lift the triggers above the scrim so a
       stationary cursor on a trigger is never covered. Secondary hardening to
       the scrim-top fix above; together they make the flicker structurally
       impossible. Scoped to the block — `.site-header` (theme-owned) untouched. */
    position: relative;
    z-index: 101;
}
/* Desktop nav reveals at MD/LG 768 to match the prototype (proto L60): tablet
   portrait shows the inline nav + 3-col mega; the 5-col step lands at 1024. */
@media (min-width: 768px) {
    .arech-megamenu .arech-mm__links { display: flex; }
}
.arech-megamenu .arech-mm__links ul {
    display: flex;
    gap: 4px;
    list-style: none;
    margin: 0;
    padding: 0;
    align-items: center;
}
.arech-megamenu .arech-mm__links > ul > li { position: static; } /* mega spans full width */

.arech-megamenu .arech-mm__link {
    position: relative;
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    padding: 12px 16px;
    font-family: var(--font-body);
    font-size: 15px;
    font-weight: 500;
    color: var(--off-white);
    text-decoration: none;
    background: transparent;
    border: 0;
    cursor: pointer;
    transition: color var(--motion-fast) var(--ease-standard);
}
.arech-megamenu .arech-mm__link:hover,
.arech-megamenu .arech-mm__link:focus-visible { color: var(--orange); }
.arech-megamenu .arech-mm__link:focus-visible {
    outline: 2px solid var(--orange);
    outline-offset: 2px;
}
.arech-megamenu .arech-mm__link.is-active { color: var(--orange); }
.arech-megamenu .arech-mm__link.is-active:hover,
.arech-megamenu .arech-mm__link.is-active:focus-visible { color: var(--off-white); }
.arech-megamenu .arech-mm__link[aria-expanded="true"] { color: var(--orange); }
.arech-megamenu .arech-mm__link[aria-expanded="true"]:hover,
.arech-megamenu .arech-mm__link[aria-expanded="true"]:focus-visible { color: var(--off-white); }

.arech-megamenu .arech-mm__chev {
    display: inline-block;
    width: 0;
    height: 0;
    margin-left: 6px;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 6px solid currentColor;
    transition: transform var(--motion-fast) var(--ease-standard);
}
.arech-megamenu .arech-mm__link[aria-expanded="true"] .arech-mm__chev { transform: rotate(180deg); }

/* -------- CTA + BURGER -------- */
.arech-megamenu .arech-mm__cta-wrap {
    display: flex;
    align-items: center;
    gap: 12px;
    justify-self: end;
}
.arech-megamenu .arech-mm__cta {
    display: none;
    align-items: center;
    min-height: 44px;
    padding: 10px 20px;
    background: var(--orange);
    color: var(--white);
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    text-decoration: none;
    border-radius: var(--radius-btn);
    transition: background var(--motion-normal) var(--ease-standard),
                transform var(--motion-normal) var(--ease-standard),
                box-shadow var(--motion-normal) var(--ease-standard);
}
@media (min-width: 768px) {
    .arech-megamenu .arech-mm__cta { display: inline-flex; }
}
.arech-megamenu .arech-mm__cta:hover,
.arech-megamenu .arech-mm__cta:focus-visible {
    background: var(--orange-bright);
    transform: translateY(-2px);
    box-shadow: 0 12px 28px color-mix(in oklch, var(--orange) 35%, transparent);
}

.arech-megamenu .arech-mm__burger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-btn);
    cursor: pointer;
    transition: border-color var(--motion-fast) var(--ease-standard);
}
.arech-megamenu .arech-mm__burger:hover,
.arech-megamenu .arech-mm__burger:focus-visible { border-color: var(--orange); }
@media (min-width: 768px) {
    .arech-megamenu .arech-mm__burger { display: none; }
}
.arech-megamenu .arech-mm__burger span {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--off-white);
    position: relative;
}
.arech-megamenu .arech-mm__burger span::before,
.arech-megamenu .arech-mm__burger span::after {
    content: '';
    position: absolute;
    left: 0;
    width: 18px;
    height: 2px;
    background: var(--off-white);
}
.arech-megamenu .arech-mm__burger span::before { top: -6px; }
.arech-megamenu .arech-mm__burger span::after { top: 6px; }
.arech-megamenu .arech-mm__burger[aria-expanded="true"] span { background: transparent; }
.arech-megamenu .arech-mm__burger[aria-expanded="true"] span::before { top: 0; transform: rotate(45deg); }
.arech-megamenu .arech-mm__burger[aria-expanded="true"] span::after { top: 0; transform: rotate(-45deg); }

/* -------- MEGA PANELS (full-width, fixed) -------- */
.arech-megamenu .arech-mm__panel {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    z-index: 99;
    background: color-mix(in oklch, var(--dark) 97%, transparent);
    backdrop-filter: blur(20px) saturate(1.4);
    -webkit-backdrop-filter: blur(20px) saturate(1.4);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    opacity: 0;
    transform: translateY(-6px);
    pointer-events: none;
    transition: opacity var(--motion-normal) var(--ease-decelerate),
                transform var(--motion-normal) var(--ease-decelerate);
}
.arech-megamenu .arech-mm__panel.is-open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}
/* Canonical container box (S72): gutter on the band, inner caps at --container. */
.arech-megamenu .arech-mm__panel-inner {
    max-width: var(--container);
    margin-inline: auto;
    padding-block: var(--space-7) var(--space-8);
    padding-inline: var(--container-px);
}
.arech-megamenu .arech-mm__eyebrow {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--muted-accessible);
    margin-bottom: var(--space-5);
    display: flex;
    align-items: center;
    gap: 12px;
}
.arech-megamenu .arech-mm__eyebrow::before {
    content: '';
    width: 24px;
    height: 1px;
    background: var(--orange);
}
.arech-megamenu .arech-mm__empty {
    font-family: var(--font-body);
    font-size: 14px;
    color: var(--light);
}

/* Products grid — mobile-first min-width steps (prototype used max-width:1100px;
   converted: 1col base → 3col at >=768 → 5col at >=1024 per task spec). */
.arech-megamenu .arech-mm__products-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-4);
}
@media (min-width: 768px) {
    .arech-megamenu .arech-mm__products-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 1024px) {
    .arech-megamenu .arech-mm__products-grid { grid-template-columns: repeat(5, 1fr); }
}

.arech-megamenu .arech-mm__card {
    display: flex;
    flex-direction: column;
    padding: 20px;
    background: var(--dark-2);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-btn);
    text-decoration: none;
    color: inherit;
    transition: background var(--motion-fast) var(--ease-standard),
                border-color var(--motion-fast) var(--ease-standard),
                transform var(--motion-fast) var(--ease-standard);
}
.arech-megamenu .arech-mm__card:hover,
.arech-megamenu .arech-mm__card:focus-visible {
    background: var(--dark-3);
    border-color: var(--orange);
    transform: translateY(-2px);
}
.arech-megamenu .arech-mm__card:focus-visible {
    outline: 2px solid var(--orange);
    outline-offset: 2px;
}
.arech-megamenu .arech-mm__card-img {
    aspect-ratio: 16 / 10;
    background: var(--dark-4);
    border: 1px dashed color-mix(in oklch, var(--orange) 40%, transparent);
    border-radius: var(--radius-btn);
    margin-bottom: var(--space-4);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.15em;
    color: var(--muted-accessible);
    text-transform: uppercase;
}
.arech-megamenu .arech-mm__card-img--photo {
    border-style: solid;
    border-color: rgba(255, 255, 255, 0.05);
    /* Transparent: product photos are transparent PNG/WebP, so they sit on the
       mega panel's dark background, not inside a filled box. */
    background: transparent;
}
.arech-megamenu .arech-mm__card-img img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}
.arech-megamenu .arech-mm__card-title {
    font-family: var(--font-headline);
    font-weight: 600;
    font-size: 18px;
    color: var(--off-white);
    margin-bottom: 6px;
}
.arech-megamenu .arech-mm__card-body {
    font-family: var(--font-body);
    font-size: 13px;
    line-height: 1.5;
    color: var(--light);
}

/* About grid — same min-width step strategy. */
.arech-megamenu .arech-mm__about-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-5);
}
@media (min-width: 768px) {
    .arech-megamenu .arech-mm__about-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 1024px) {
    .arech-megamenu .arech-mm__about-grid { grid-template-columns: repeat(5, 1fr); }
}
.arech-megamenu .arech-mm__about-link {
    display: flex;
    flex-direction: column;
    padding: 16px 12px;
    text-decoration: none;
    color: inherit;
    border-left: 2px solid transparent;
    transition: border-color var(--motion-fast) var(--ease-standard),
                background var(--motion-fast) var(--ease-standard);
}
.arech-megamenu .arech-mm__about-link:hover,
.arech-megamenu .arech-mm__about-link:focus-visible {
    border-left-color: var(--orange);
    background: color-mix(in oklch, var(--orange) 4%, transparent);
}
.arech-megamenu .arech-mm__about-link:focus-visible {
    outline: 2px solid var(--orange);
    outline-offset: 2px;
}
.arech-megamenu .arech-mm__about-title {
    font-family: var(--font-headline);
    font-weight: 600;
    font-size: 15px;
    color: var(--off-white);
    margin-bottom: 4px;
}
.arech-megamenu .arech-mm__about-desc {
    font-family: var(--font-body);
    font-size: 12px;
    line-height: 1.5;
    color: var(--light);
}

/* -------- SCRIM -------- */
/* ROOT-CAUSE FIX (S74 flicker): the scrim must NEVER cover the nav band.
   Triggers live inside the theme's `.site-header` (a sticky z-index:100 stacking
   context); the scrim + panel are children of that same header, so the scrim's
   local z-index:98 sits ABOVE the triggers (which have z-index:auto). With the
   old `inset:0` the scrim therefore covered the trigger row at y=40, stealing the
   hover off the trigger → mouseleave → close → mouseenter → open → flicker
   (rendered-DOM proof: elementFromPoint(533,40) returned `.arech-mm__scrim`).
   Anchoring the scrim's top at the header height removes the cause: triggers are
   never under the scrim regardless of stacking context, and visually the dim
   correctly begins below the crisp top nav (matches the prototype intent —
   nothing to dim behind a top-anchored nav). Belt-and-braces with the trigger
   z-index lift below (restores the prototype's z-100-nav > z-98-scrim invariant). */
.arech-megamenu .arech-mm__scrim {
    position: fixed;
    inset: var(--header-height) 0 0 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 98;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--motion-normal) var(--ease-standard);
}
.arech-megamenu .arech-mm__scrim.is-open {
    opacity: 1;
    pointer-events: auto;
}

/* -------- MOBILE OVERLAY -------- */
.arech-megamenu .arech-mm__overlay {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: color-mix(in oklch, var(--dark) 98%, transparent);
    backdrop-filter: blur(30px) saturate(1.4);
    -webkit-backdrop-filter: blur(30px) saturate(1.4);
    display: flex;
    flex-direction: column;
    padding: var(--container-px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--motion-normal) var(--ease-standard);
    overflow-y: auto;
}
.arech-megamenu .arech-mm__overlay.is-open {
    opacity: 1;
    pointer-events: auto;
}
.arech-megamenu .arech-mm__overlay-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: var(--header-height);
}
.arech-megamenu .arech-mm__overlay-brand {
    display: block;
    height: 32px;
    width: auto;
}
.arech-megamenu .arech-mm__overlay-close {
    width: 44px;
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius-btn);
    cursor: pointer;
    color: var(--off-white);
    font-family: var(--font-mono);
    font-size: 22px;
    line-height: 1;
}
.arech-megamenu .arech-mm__overlay-close:hover,
.arech-megamenu .arech-mm__overlay-close:focus-visible { border-color: var(--orange); }
.arech-megamenu .arech-mm__overlay-links {
    list-style: none;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: var(--space-5) var(--space-2);
}
.arech-megamenu .arech-mm__overlay-link {
    display: block;
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 700;
    color: var(--off-white);
    text-decoration: none;
    padding: 14px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.arech-megamenu .arech-mm__overlay-link:hover { color: var(--orange); }
.arech-megamenu .arech-mm__overlay-link.is-active { color: var(--orange); }

.arech-megamenu .arech-mm__overlay-acc {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 700;
    color: var(--off-white);
    text-decoration: none;
    padding: 14px 0;
    border: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    background: transparent;
    width: 100%;
    min-height: 44px;
    cursor: pointer;
}
.arech-megamenu .arech-mm__overlay-acc[aria-expanded="true"] { color: var(--orange); }
.arech-megamenu .arech-mm__overlay-acc[aria-expanded="true"] .arech-mm__overlay-acc-icon { transform: rotate(45deg); }
.arech-megamenu .arech-mm__overlay-acc-icon {
    display: inline-block;
    transition: transform var(--motion-fast) var(--ease-standard);
}
.arech-megamenu .arech-mm__overlay-acc-body {
    display: none;
    padding: 12px 12px 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.arech-megamenu .arech-mm__overlay-acc-body.is-open {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.arech-megamenu .arech-mm__overlay-acc-body a {
    font-family: var(--font-body);
    font-size: 15px;
    color: var(--light);
    text-decoration: none;
    padding: 8px 0;
    min-height: 44px;
    display: flex;
    align-items: center;
}
.arech-megamenu .arech-mm__overlay-acc-body a:hover { color: var(--orange); }
.arech-megamenu .arech-mm__overlay-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 56px;
    background: var(--orange);
    color: var(--white);
    font-family: var(--font-mono);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    text-decoration: none;
    border-radius: var(--radius-btn);
    margin-top: var(--space-5);
}
.arech-megamenu .arech-mm__overlay-cta:hover,
.arech-megamenu .arech-mm__overlay-cta:focus-visible { background: var(--orange-bright); }

/* -------- REDUCED MOTION (mandatory) -------- */
@media (prefers-reduced-motion: reduce) {
    .arech-megamenu .arech-mm__panel,
    .arech-megamenu .arech-mm__scrim,
    .arech-megamenu .arech-mm__overlay,
    .arech-megamenu .arech-mm__chev,
    .arech-megamenu .arech-mm__card,
    .arech-megamenu .arech-mm__about-link,
    .arech-megamenu .arech-mm__cta,
    .arech-megamenu .arech-mm__overlay-acc-icon,
    .arech-megamenu .arech-mm__link {
        transition: none !important;
    }
}


/* ============================================================================
   TDM Blocks — design tokens (--tdm-* namespace)

   The package ships its OWN token set so it works standalone on any Concrete
   site. Blocks NEVER hard-code values — they reference var(--tdm-*). The Brand
   Kit dashboard overrides any of these at :root per site, re-skinning every
   block at once.

   Defaults below are seeded from the ARECH design-system-v1 (dark theme) as
   the first consumer; on a new site, set the Brand Kit and these are replaced.
   On ARECH you may also map a token to the live theme variable, e.g.
   `--tdm-color-accent: var(--orange);` so the library tracks the theme.
   ============================================================================ */

:root {
  /* --- Palette -------------------------------------------------------------
     ink = text on surface; surface = block background; accent = CTA/links. */
  --tdm-color-ink:          #F5F4F0;   /* primary text  (ARECH --off-white) */
  --tdm-color-ink-2:        #B0B0BA;   /* secondary     (ARECH --light)     */
  --tdm-color-ink-3:        #6B6B75;   /* tertiary/meta (ARECH --muted)     */
  --tdm-color-surface:      #0D0D0F;   /* base bg       (ARECH --dark)      */
  --tdm-color-surface-2:    #141416;   /* raised bg                          */
  --tdm-color-surface-3:    #1C1C20;   /* card bg                            */
  --tdm-color-accent:       #E8651A;   /* primary accent FILL: CTA bg, chips, borders, glow (ARECH --orange) */
  --tdm-color-accent-hover: #FF7A2F;
  --tdm-color-accent-active:#C4510E;
  --tdm-color-on-accent:    #FFFFFF;   /* text ON an accent fill (orange-fill + white = valid AA pair) */
  /* Accent used AS TEXT (links, eyebrow accents, accent spans). On a DARK band
     this equals --tdm-color-accent (#E8651A reads AA on dark, 5.74:1). The
     base.css [data-band="light"] hook remaps the per-instance --tdmx-accent-text
     to --tdm-color-accent-text-light on a cream band, where #E8651A fails AA
     (2.8–3.0:1). FILL usages keep --tdm-color-accent and never flip. */
  --tdm-color-accent-text:       var(--tdm-color-accent);   /* dark-band: orange */
  --tdm-color-accent-text-light: #B0470B;   /* light-band link/text accent (ARECH --orange-link): 5.65:1 on paper-0, 5.09:1 on paper-1, 4.65:1 on paper-2 = AA body PASS on all creams (colorist-verified, strict WCAG) */

  /* Hairline via color-mix so it tracks ink on any surface. */
  --tdm-hairline: color-mix(in srgb, var(--tdm-color-ink) 14%, transparent);

  /* --- Fonts (self-hosted by the theme; package only references families) - */
  --tdm-font-display:  "Geist", system-ui, sans-serif;
  --tdm-font-headline: "General Sans", Inter, system-ui, sans-serif;
  --tdm-font-body:     "DM Sans", system-ui, sans-serif;
  /* Label / eyebrow / caption voice. DM Mono retired 2026-06-02 site-wide;
     aligned to General Sans to match the theme's --font-mono (S80). */
  --tdm-font-mono:     "General Sans", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;

  /* --- Type scale (fluid clamp; never a fixed px in a media query) -------- */
  --tdm-text-h1:      clamp(48px, 6vw, 88px);
  --tdm-text-h2:      clamp(42px, 5vw, 72px);
  --tdm-text-h3:      clamp(28px, 3vw, 36px);
  --tdm-text-h4:      20px;
  --tdm-text-h5:      16px;
  --tdm-text-body:    16px;
  --tdm-text-body-sm: 14px;
  --tdm-text-eyebrow: 11px;
  --tdm-text-caption: 12px;

  --tdm-weight-display:  700;
  --tdm-weight-headline: 600;
  --tdm-weight-body:     400;

  --tdm-leading-tight: 1.1;
  --tdm-leading-snug:  1.3;
  --tdm-leading-body:  1.65;

  /* --- Spacing scale (4px base — matches ARECH --space-1..11) ------------- */
  --tdm-space-1:  4px;
  --tdm-space-2:  8px;
  --tdm-space-3:  12px;
  --tdm-space-4:  16px;
  --tdm-space-5:  24px;
  --tdm-space-6:  32px;
  --tdm-space-7:  48px;
  --tdm-space-8:  64px;
  --tdm-space-9:  96px;
  --tdm-space-10: 128px;
  --tdm-space-11: 160px;

  /* --- Containers (single uniform container — ARECH responsive manual) ---- */
  --tdm-container:        1200px;  /* caps identically across hero/body/footer */
  --tdm-container-narrow: 720px;
  --tdm-gutter:           16px;    /* steps up at breakpoints in base.css      */

  /* --- Radius (cap 6px on cards per ARECH rule; pill only where allowed) -- */
  --tdm-radius-sm:   4px;
  --tdm-radius-md:   6px;
  --tdm-radius-lg:   12px;
  --tdm-radius-pill: 999px;
  --tdm-radius-btn:  2px;   /* flat action buttons (ARECH FIX-1) */

  /* --- Shadow presets ----------------------------------------------------- */
  --tdm-shadow-sm: 0 1px 2px color-mix(in srgb, #000 30%, transparent);
  --tdm-shadow-md: 0 4px 16px color-mix(in srgb, #000 35%, transparent);
  --tdm-shadow-lg: 0 12px 40px color-mix(in srgb, #000 45%, transparent);

  /* --- Motion (composite-only; respect reduced-motion in base.css) -------- */
  --tdm-dur-fast:  150ms;
  --tdm-dur-base:  250ms;
  --tdm-dur-slow:  400ms;
  --tdm-ease-standard: cubic-bezier(0.22, 0.61, 0.36, 1);
  --tdm-ease-emphatic: cubic-bezier(0.16, 1, 0.3, 1);
}


/* ============================================================================
   TDM Blocks — scoped base layer (.tdm-*)

   Scoped under .tdm-* so nothing leaks into the host theme. Provides:
   - the shared block wrapper that consumes per-instance --tdmx-* variables
     (emitted by CssEmitter into a `.tdm-i-<bID>` rule);
   - the uniform container + responsive gutter (ARECH responsive manual);
   - alignment + background plumbing;
   - the mandatory prefers-reduced-motion branch.

   Per-instance variables (set by CssEmitter, fall back to global --tdm-* tokens):
     --tdmx-pad-top/right/bottom/left, --tdmx-margin-top/bottom, --tdmx-gap,
     --tdmx-text, --tdmx-heading, --tdmx-accent, --tdmx-align, --tdmx-max-width,
     --tdmx-bg, --tdmx-radius, --tdmx-border, --tdmx-shadow, --tdmx-font-heading,
     --tdmx-font-body.
   ============================================================================ */

.tdm-block {
  --tdmx-pad-top:    var(--tdm-space-9);
  --tdmx-pad-right:  0px;
  --tdmx-pad-bottom: var(--tdm-space-9);
  --tdmx-pad-left:   0px;
  --tdmx-margin-top: 0px;
  --tdmx-margin-bottom: 0px;
  --tdmx-gap:        var(--tdm-space-5);
  --tdmx-text:       var(--tdm-color-ink);
  --tdmx-heading:    var(--tdm-color-ink);
  --tdmx-accent:     var(--tdm-color-accent);
  /* Accent split into two roles so a light band can re-tone TEXT without ever
     touching FILLS (S106-class fix). --tdmx-accent = the orange FILL (CTA bg,
     chips, borders, glow) — NEVER flipped. --tdmx-accent-text = accent used as
     TEXT (links, eyebrow accents, accent spans) — defaults to --tdmx-accent so
     it tracks any operator accent override, and is the ONLY accent var the
     [data-band="light"] hook remaps (to --orange-link, AA on cream). */
  --tdmx-accent-text: var(--tdmx-accent);
  --tdmx-align:      left;
  --tdmx-max-width:  var(--tdm-container);
  --tdmx-bg:         transparent;
  --tdmx-radius:     0px;
  --tdmx-border:     0 solid transparent;
  --tdmx-shadow:     none;
  --tdmx-font-heading: var(--tdm-font-headline);
  --tdmx-font-body:    var(--tdm-font-body);

  padding: var(--tdmx-pad-top) var(--tdmx-pad-right) var(--tdmx-pad-bottom) var(--tdmx-pad-left);
  margin-block: var(--tdmx-margin-top) var(--tdmx-margin-bottom);
  /* Band pattern by default, contained mode on demand.
     - 'full' (default, no var emitted): max-width:none + margin-inline:0 =>
       the block fills its parent => FULL-BLEED background (the band).
     - 'contained' (PHP emits --tdmx-block-max:var(--tdm-container) and
       --tdmx-block-mi:auto): the whole block (bg + inner) is capped at 1200
       and centred. The ::before/::after image+overlay are inset:0 of this box,
       so they follow the contained box automatically. */
  max-width: var(--tdmx-block-max, none);
  margin-inline: var(--tdmx-block-mi, 0);
  background: var(--tdmx-bg);
  color: var(--tdmx-text);
  border: var(--tdmx-border);
  border-radius: var(--tdmx-radius);
  box-shadow: var(--tdmx-shadow);
  font-family: var(--tdmx-font-body);
  position: relative;
  isolation: isolate;
}

/* ── Universal band tone (spec §1b / §1e — cascade layer `base`) ────────────
   ONE place that re-tones EVERY .tdm-block for a light or dark band, replacing
   the per-block [data-band] ink hooks. The view emits data-band only when the
   band resolves to LIGHT (auto-detected light solid bg, or d_band=light) or to
   a FORCED dark (d_band=dark on an unknown image/gradient bg). Default
   (dark-first site, no attribute) is byte-identical to today.

   Flips ONLY the two universal ink vars (--tdmx-heading / --tdmx-text) that
   Family-A blocks consume; accent (orange) is intentionally untouched — it
   reads AA on both cream and dark. Ink-on-light is derived from the surface
   token via color-mix (no magic hex):
     heading = full surface ink (#0D0D0F-equivalent, ~16:1 on cream)
     body    = surface 78%      (mirrors the S106-tuned value, ~7:1 on cream)
   No !important; single attribute-selector specificity so an explicit
   per-instance .tdm-i-<bID> colour rule from CssEmitter still wins.
   The 13 Family-B blocks (which read the never-assigned --tdmx-*-color suffix)
   add their own [data-band="light"] remap in their view.css — see spec §1e. */
.tdm-block[data-band="light"] {
  --tdmx-heading: var(--tdm-color-surface);                               /* #0D0D0F ink */
  --tdmx-text:    color-mix(in srgb, var(--tdm-color-surface) 78%, transparent);
  /* Accent-as-TEXT remap (S106-class fix): #E8651A orange fails AA as text on a
     cream band (2.8–3.0:1). Flip ONLY the text accent to --orange-link (#B84A0C,
     ≥4.46:1 on paper-0/1/2 = AA body). FILL accent (--tdmx-accent) is untouched,
     so orange CTA buttons / chips / borders + their white text stay #E8651A. */
  --tdmx-accent-text: var(--tdm-color-accent-text-light);
}
/* Forced dark band (d_band=dark) — restores the dark-first ink explicitly so a
   block placed on a dark image/gradient (where auto-luminance can't read a hex)
   is guaranteed legible-light, even if some ancestor set a light tone. */
.tdm-block[data-band="dark"] {
  --tdmx-heading: var(--tdm-color-ink);                                   /* #F5F4F0 */
  --tdmx-text:    var(--tdm-color-ink-2);                                 /* #B0B0BA */
  --tdmx-accent-text: var(--tdmx-accent);                                 /* orange — AA on dark (5.74:1) */
}

/* Per-handle band-padding fallback for the composite containers (Bug 3c).
   tdm_columns emits design vars change-only, so a container left at its new
   smaller default emits NOTHING and would otherwise fall back to the global
   --tdmx-pad-* (space-9 = 96px). Pin the fallback to the same new default
   (space-6 = 32px) declared in DesignControls::DEFAULT_OVERRIDES so a fresh
   container is a tight band and "default == fallback" stays consistent.
   tdm_section emits all vars (changedOnly=false) so this is a harmless safety
   net for it; an emitted var always wins over this fallback. */
.tdm-columns, .tdm-section {
  --tdmx-pad-top:    var(--tdm-space-6);
  --tdmx-pad-bottom: var(--tdm-space-6);
}

/* Universal background image + overlay via pseudo-elements — driven purely by
   the emitted --tdmx-bg-image / --tdmx-overlay vars, so EVERY block supports a
   background image with overlay without any per-view markup. When the vars are
   unset (no image chosen) they fall back to none/transparent (invisible). */
.tdm-block::after {            /* image layer, behind everything */
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background-image: var(--tdmx-bg-image, none);
  background-size: cover;
  background-position: center;
  pointer-events: none;
}
.tdm-block::before {           /* overlay, above image, below content */
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--tdmx-overlay, transparent);
  pointer-events: none;
}
/* Legacy explicit layers (section/hero/cta views) — now redundant no-ops. */
.tdm-block__bg, .tdm-block__overlay { display: none; }

/* ── Edit-mode SubArea editability fix (Bug 3b) ────────────────────────────
   On container blocks (tdm_section / tdm_columns) `isolation: isolate` creates
   a stacking context that traps Concrete's in-context edit overlays (move/edit
   grips) of the INNER SubArea blocks beneath the parent block's UI, leaving
   only the parent editable. In edit mode ONLY, drop the isolation on the
   containers and suppress the negative-z background pseudo-elements so the
   inner block handles can stack above. Anonymous (non-edit) output is
   unaffected: front-end pages have no `.ccm-edit-mode` class, so these rules
   never match → render is byte-identical. */
.ccm-edit-mode .tdm-section,
.ccm-edit-mode .tdm-columns,
.ccm-edit-mode .tdm-block__inner .tdm-block { isolation: auto; }   /* S94: un-isolate NESTED children too — S88 reset only the outer containers, so a 2nd isolated child in a column trapped its own edit overlay → only the parent stayed editable */
.ccm-edit-mode .tdm-section::before,
.ccm-edit-mode .tdm-section::after,
.ccm-edit-mode .tdm-columns::before,
.ccm-edit-mode .tdm-columns::after { display: none; }

/* Inner = the container. Single uniform width, responsive gutter. */
.tdm-block__inner {
  width: 100%;
  max-width: var(--tdmx-max-width);
  margin-inline: auto;
  padding-inline: var(--tdm-gutter);
  text-align: var(--tdmx-align);
}

/* ── Nesting anti-compounding (Bug 3c) ─────────────────────────────────────
   Real DOM (verified from tdm_section/view.php & tdm_columns/view.php):
     tdm_section:  .tdm-section > .tdm-block__inner > [SubArea] > .tdm-block
     tdm_columns:  .tdm-columns > .tdm-block__inner > .tdm-columns__grid
                     > .tdm-columns__col > [SubArea] > .tdm-block
   A child .tdm-block inside a container's inner/column carries its own space-9
   band by default → paddings add (padding never collapses) → ~192px double band
   when nested. Zero the nested child's vertical band padding; the outer
   container owns the band. (Inline padding-inline is the gutter, suppressed on
   nested inner wrappers below.) These selectors only match the real nesting
   chains — top-level blocks on a normal page are unaffected → byte-identical. */
/* Bug-3c anti-compounding, fixed (S117): zero the nested child's DEFAULT band
   via the per-instance VARIABLE (not a hard longhand), so an operator's
   explicit per-instance pad — emitted at equal specificity on
   `.tdm-block.tdm-i-<bID>` (CssEmitter) and printed after this sheet — still
   wins on source order. A nested block left at default has no per-instance pad
   var, so this 0 holds → single band, no 192px compounding. */
.tdm-block__inner .tdm-block {
  --tdmx-pad-top: 0px;
  --tdmx-pad-bottom: 0px;
}
.tdm-block__inner .tdm-block__inner {
  padding-inline: 0;
}

.tdm-block h1, .tdm-block h2, .tdm-block h3,
.tdm-block h4, .tdm-block h5, .tdm-block h6 {
  color: var(--tdmx-heading);
  font-family: var(--tdmx-font-heading);
}

.tdm-block img { max-width: 100%; height: auto; display: block; }

/* Responsive gutter — min-width only (ARECH responsive manual). */
@media (min-width: 680px)  { :root { --tdm-gutter: 20px; } }
@media (min-width: 768px)  { :root { --tdm-gutter: 24px; } }
@media (min-width: 1024px) { :root { --tdm-gutter: 32px; --tdm-container: 1140px; } }
@media (min-width: 1440px) { :root { --tdm-gutter: 40px; --tdm-container: 1200px; } }

/* Shared action buttons (flat radius per ARECH; ≥44px touch target). */
.tdm-btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 44px; padding: 0 var(--tdm-space-6);
  border-radius: var(--tdm-radius-btn); border: 1px solid transparent;
  font-family: var(--tdm-font-headline); font-weight: var(--tdm-weight-headline);
  font-size: var(--tdm-text-body-sm); text-decoration: none; cursor: pointer;
  transition: background var(--tdm-dur-fast) var(--tdm-ease-standard),
              color var(--tdm-dur-fast) var(--tdm-ease-standard),
              border-color var(--tdm-dur-fast) var(--tdm-ease-standard);
}
.tdm-btn--primary { background: var(--tdmx-accent, var(--tdm-color-accent)); color: var(--tdm-color-on-accent); }
.tdm-btn--primary:hover { background: var(--tdm-color-accent-hover); color: var(--tdm-color-on-accent); }
.tdm-btn--ghost { background: transparent; color: var(--tdmx-text, var(--tdm-color-ink));
  border-color: color-mix(in srgb, var(--tdmx-text, var(--tdm-color-ink)) 35%, transparent); }
.tdm-btn--ghost:hover { border-color: var(--tdmx-accent, var(--tdm-color-accent)); color: var(--tdmx-accent-text, var(--tdm-color-accent)); }
@media (prefers-reduced-motion: reduce) { .tdm-btn { transition: none; } }

/* Hover effects (composite-only). */
.tdm-hover-lift  { transition: transform var(--tdm-dur-base) var(--tdm-ease-standard); }
.tdm-hover-lift:hover  { transform: translateY(-4px); }
.tdm-hover-scale { transition: transform var(--tdm-dur-base) var(--tdm-ease-standard); }
.tdm-hover-scale:hover { transform: scale(1.02); }
.tdm-hover-glow  { transition: box-shadow var(--tdm-dur-base) var(--tdm-ease-standard); }
.tdm-hover-glow:hover  { box-shadow: 0 0 0 1px var(--tdmx-accent), var(--tdm-shadow-md); }

/* Entrance reveal (one per block; JS adds .is-in when in view). */
.tdm-reveal { opacity: 0; transition: opacity var(--tdm-dur-slow) var(--tdm-ease-emphatic),
                                       transform var(--tdm-dur-slow) var(--tdm-ease-emphatic); }
.tdm-reveal.fade-up    { transform: translateY(24px); }
.tdm-reveal.slide-left { transform: translateX(24px); }
.tdm-reveal.is-in      { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .tdm-hover-lift, .tdm-hover-scale, .tdm-hover-glow,
  .tdm-reveal { transition: none !important; transform: none !important; }
  .tdm-reveal { opacity: 1 !important; }
}


/* ARECH Subpage Hero — Editorial (".eh") view.css
   Port of /prototypes/about-hub-v2 `.eh` header. Namespaced `arech-eh`.
   Container law: single uniform --container (1140 -> 1200), NOT --container-wide. */

.arech-eh {
    position: relative;
    background: var(--tdmx-bg, var(--dark));
    min-height: 30vh;
    padding-block: var(--tdmx-pad-top, var(--space-7)) var(--tdmx-pad-bottom, var(--space-7));
    padding-inline: 16px;
    margin-block: var(--tdmx-margin-top, 0px) var(--tdmx-margin-bottom, 0px);
    overflow: hidden;
    isolation: isolate;
}
@media (min-width: 480px)  { .arech-eh { padding-left: 24px; padding-right: 24px; } }
@media (min-width: 768px)  { .arech-eh { padding-left: 32px; padding-right: 32px; min-height: 36vh; } }
@media (min-width: 1024px) { .arech-eh { padding-block: var(--tdmx-pad-top, var(--space-9)) var(--tdmx-pad-bottom, var(--space-7)); padding-inline: 40px; min-height: 40vh; } }

/* --- News/Blog LIST heroes (list_hero template) — EQUAL top/bottom gap ---
   The block's declared default is space-7/space-7, but the generic >=1024 rule
   above uses space-9 on TOP, which made the list heroes asymmetric (96 top /
   48 bottom). Scope a symmetric pair (smaller gap = space-7 / 48px) to the
   .page-listhero wrapper so ONLY /news + /blog change; About (about_detail) keeps
   its own rhythm. justify-content:center makes the column vertically centred too,
   so a short header (no CTAs) sits symmetrically inside the min-height band. */
.page-listhero .arech-eh__inner { justify-content: center; }
@media (min-width: 1024px) {
    .page-listhero .arech-eh {
        padding-block: var(--tdmx-pad-top, var(--space-7)) var(--tdmx-pad-bottom, var(--space-7));
    }
}

/* --- Ambient LED-matrix background (decorative) --- */
.arech-eh__led-bg {
    position: absolute;
    top: 0; right: 0; bottom: 0;
    width: 30%;
    transform: perspective(800px) rotateY(-8deg);
    transform-origin: right center;
    opacity: 0;
    transition: opacity var(--motion-reveal) var(--ease-standard);
    z-index: -3;
    pointer-events: none;
    -webkit-mask-image: linear-gradient(to left, black 50%, transparent 100%), linear-gradient(to top, black 60%, transparent 100%);
            mask-image: linear-gradient(to left, black 50%, transparent 100%), linear-gradient(to top, black 60%, transparent 100%);
    -webkit-mask-composite: source-in;
            mask-composite: intersect;
    display: grid;
    grid-template-columns: repeat(28, 1fr);
    gap: 2px;
    padding: 8px;
}
.arech-eh__led-bg.is-visible { opacity: 0.14; }
@media (min-width: 768px)  { .arech-eh__led-bg { width: 45%; } .arech-eh__led-bg.is-visible { opacity: 0.16; } }
@media (min-width: 1024px) { .arech-eh__led-bg { width: 55%; } .arech-eh__led-bg.is-visible { opacity: 0.20; } }

.arech-eh__led-dot {
    aspect-ratio: 1;
    border-radius: 50%;
    background: var(--orange);
    opacity: var(--base, 0.1);
}
@keyframes arechEhLedFlicker { 0%, 100% { opacity: var(--base, 0.1); } 50% { opacity: var(--peak, 0.7); } }

.arech-eh__led-grid {
    position: absolute;
    inset: -56px 0 0 0;
    z-index: -2;
    pointer-events: none;
    background-image:
        linear-gradient(color-mix(in srgb, var(--orange) 7%, transparent) 1px, transparent 1px),
        linear-gradient(90deg, color-mix(in srgb, var(--orange) 7%, transparent) 1px, transparent 1px);
    background-size: 56px 56px;
}
.arech-eh__warmglow {
    position: absolute; inset: 0; z-index: -1; pointer-events: none;
    background: radial-gradient(ellipse 80% 60% at 60% 40%, color-mix(in srgb, var(--orange) 12%, transparent) 0%, transparent 60%);
}
.arech-eh__bottom-fade {
    position: absolute; inset: 0; z-index: -1; pointer-events: none;
    background: linear-gradient(to bottom, transparent 40%, var(--dark) 100%);
}
.arech-eh::after {
    content: ''; position: absolute; left: 0; right: 0; bottom: 0; height: 1px;
    background: color-mix(in srgb, #fff 4%, transparent); z-index: 1;
}

/* --- Content --- */
.arech-eh__inner {
    position: relative;
    z-index: 2;
    max-width: var(--tdmx-max-width, var(--container));
    margin-inline: auto;
    text-align: var(--tdmx-align, left);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    min-height: inherit;
}
.arech-eh__eyebrow {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--off-white); /* orange fails AA at 11px; keep the orange tick (::before) for the brand accent */
    display: inline-flex;
    align-items: center;
    gap: 12px;
    margin: 0 0 var(--space-4);
}
.arech-eh__eyebrow::before { content: ''; width: 24px; height: 1px; background: var(--tdmx-accent, var(--orange)); }

.arech-eh__h1 {
    font-family: var(--font-headline);
    font-weight: 600;
    font-size: clamp(36px, 5vw, 72px);
    line-height: 1.05;
    letter-spacing: -0.015em;
    color: var(--tdmx-heading, var(--off-white));
    max-width: 22ch;
    margin: 0;
}
.arech-eh__accent { color: var(--tdmx-accent, var(--orange)); }

.arech-eh__lead {
    font-family: var(--font-body);
    font-style: italic;
    font-weight: 300;
    font-size: clamp(17px, 1.6vw, 21px);
    line-height: 1.55;
    color: var(--tdmx-text, var(--light));
    max-width: 60ch;
    margin: var(--space-5) 0 0;
}
.arech-eh__ctas {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-top: var(--space-6);
}

/* --- Entrance (CSS-only, safe: content is visible by default) --- */
@media (prefers-reduced-motion: no-preference) {
    .arech-eh__eyebrow { animation: arechEhFadeUp var(--motion-reveal) var(--ease-decelerate) var(--stagger-1) both; }
    .arech-eh__h1      { animation: arechEhFadeUp var(--motion-reveal) var(--ease-decelerate) var(--stagger-2) both; }
    .arech-eh__lead    { animation: arechEhFadeUp var(--motion-reveal) var(--ease-decelerate) var(--stagger-3) both; }
    .arech-eh__ctas    { animation: arechEhFadeUp var(--motion-reveal) var(--ease-decelerate) var(--stagger-4) both; }
    .arech-eh--led .arech-eh__led-grid.is-drift { animation: arechEhGridMove var(--motion-ambient-fast) var(--ease-linear) infinite; }
    .arech-eh__led-dot { animation: arechEhLedFlicker var(--d, 4s) ease-in-out var(--delay, 0s) infinite; }
}
@keyframes arechEhFadeUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: none; } }
@keyframes arechEhGridMove { from { transform: translateY(0); } to { transform: translateY(56px); } }

@media (prefers-reduced-motion: reduce) {
    .arech-eh__eyebrow, .arech-eh__h1, .arech-eh__lead, .arech-eh__ctas {
        opacity: 1; transform: none; animation: none;
    }
    .arech-eh__led-dot, .arech-eh__led-grid { animation: none; }
}


/* ============================================================
   ARECH News List block — front-end styles.

   Port of the LIGHT body of the prototype
     prototypes/news-list-v1/index.html
   (the .filter-section + .grid-section regions ONLY — the navbar / breadcrumb /
   dark editorial header / footer are separate global blocks and are NOT styled
   here). Re-tokenized to the theme tokens (main.css :root) and corrected to the
   responsive standard (responsive_manual_en_0.1: min-width ONLY, no max-width
   media queries; canonical container box --container 1140/1200).

   ALL rules are scoped under `.arech-news` so nothing leaks into the theme.
   Font families use theme tokens (--font-mono / --font-headline / --font-body)
   so a later phase can remap them globally — no literal family names.
   ============================================================ */

.arech-news { display: block; }

.arech-news__intro {
    max-width: var(--tdmx-max-width, var(--container));
    margin: 0 auto;
    padding-block: var(--space-6) 0;
    padding-inline: var(--container-px);
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.6;
    color: var(--tdmx-text, var(--ink-2));
}

/* ============================================================
   FILTER BAR — Light body
   Search input left + category chips right + status line.
   ============================================================ */
.arech-news__filter-section {
    background: var(--tdmx-bg, var(--paper-1));
    padding-block: var(--tdmx-pad-top, var(--space-8)) var(--space-5);
    padding-inline: var(--container-px);
}
@media (min-width: 768px) { .arech-news__filter-section { padding-top: var(--tdmx-pad-top, var(--space-9)); } }
.arech-news__filter-inner { max-width: var(--tdmx-max-width, var(--container)); margin-inline: auto; }

.arech-news__filter-bar {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    padding: var(--space-5);
    background: var(--paper-0);
    border: 1px solid var(--hairline);
    border-radius: 2px;
}
@media (min-width: 1024px) {
    .arech-news__filter-bar {
        flex-direction: row;
        align-items: center;
        gap: var(--space-6);
        padding: var(--space-4) var(--space-5);
    }
}

.arech-news__search-field {
    position: relative;
    flex-shrink: 0;
    width: 100%;
}
@media (min-width: 1024px) { .arech-news__search-field { width: 320px; } }
.arech-news__search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 16px; height: 16px;
    /* v1.1 fix-pack [H4]: ink-3 for safer contrast next to body-size input. */
    color: var(--ink-3);
    pointer-events: none;
}
.arech-news__search-input {
    width: 100%;
    min-height: 44px;
    padding: 10px 12px 10px 40px;
    background: var(--paper-1);
    border: 1px solid var(--hairline);
    border-radius: 2px;
    font-family: var(--font-body);
    font-size: 15px; font-weight: 400;
    color: var(--ink-1);
    transition: border-color var(--motion-fast) var(--ease-standard), background var(--motion-fast) var(--ease-standard);
}
/* v1.1 fix-pack [H4]: placeholder needs ink-3 contrast (ink-4 FAILs body AA). */
.arech-news__search-input::placeholder { color: var(--ink-3); }
.arech-news__search-input:hover { border-color: var(--hairline-strong); }
.arech-news__search-input:focus { outline: 2px solid var(--orange); outline-offset: 2px; background: var(--paper-0); border-color: var(--orange); }

.arech-news__filter-divider {
    display: none;
    width: 1px; align-self: stretch;
    background: var(--hairline);
}
@media (min-width: 1024px) { .arech-news__filter-divider { display: block; } }

.arech-news__chip-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    flex: 1;
}
.arech-news__chip-label {
    font-family: var(--font-mono);
    font-size: 10px; font-weight: 500;
    letter-spacing: 0.15em; text-transform: uppercase;
    color: var(--tdmx-text, var(--ink-3));
    align-self: center;
    margin-right: var(--space-2);
}
.arech-news__chip {
    display: inline-flex; align-items: center;
    min-height: 36px;
    padding: 6px 14px;
    background: var(--paper-1);
    border: 1px solid var(--hairline);
    /* S78b — user mod #4: news category filter chips were pill (999px); flatten
       to the site action-button standard (S73 FIX-1) so they match every other
       button on the site. */
    border-radius: var(--radius-btn);
    font-family: var(--font-mono);
    font-size: 11px; font-weight: 500;
    letter-spacing: 0.1em; text-transform: uppercase;
    color: var(--ink-2);
    cursor: pointer;
    transition:
        background var(--motion-fast) var(--ease-standard),
        border-color var(--motion-fast) var(--ease-standard),
        color var(--motion-fast) var(--ease-standard),
        transform var(--motion-fast) var(--ease-standard);
}
.arech-news__chip:hover { border-color: var(--orange); color: var(--ink-1); transform: translateY(-1px); }
.arech-news__chip:focus-visible { outline: 2px solid var(--orange); outline-offset: 2px; }
/* v1.1 fix-pack [M2]: dark-on-orange for contrast (white-on-orange FAILs body AA). */
.arech-news__chip.is-active {
    background: var(--tdmx-accent, var(--orange));
    border-color: var(--tdmx-accent, var(--orange));
    color: var(--dark);
}
.arech-news__chip.is-active:hover { background: var(--orange-bright); border-color: var(--orange-bright); }
.arech-news__chip-count {
    margin-left: 6px;
    opacity: 0.7;
    font-size: 10px;
}

.arech-news__reset-btn {
    display: none;
    align-items: center;
    min-height: 36px;
    padding: 8px 14px;
    background: transparent;
    border: 1px solid var(--hairline);
    border-radius: 2px;
    font-family: var(--font-mono);
    font-size: 10px; font-weight: 500;
    letter-spacing: 0.15em; text-transform: uppercase;
    color: var(--ink-3);
    cursor: pointer;
    transition: border-color var(--motion-fast) var(--ease-standard), color var(--motion-fast) var(--ease-standard);
    flex-shrink: 0;
}
.arech-news__reset-btn.is-visible { display: inline-flex; }
.arech-news__reset-btn:hover { border-color: var(--orange); color: var(--orange); }
.arech-news__reset-btn:focus-visible { outline: 2px solid var(--orange); outline-offset: 2px; }

.arech-news__filter-status {
    margin-top: var(--space-4);
    font-family: var(--font-mono);
    font-size: 11px; font-weight: 500;
    letter-spacing: 0.1em; text-transform: uppercase;
    color: var(--tdmx-text, var(--ink-3));
    min-height: 18px;
}
.arech-news__count-num { color: var(--tdmx-accent, var(--orange)); font-weight: 600; }

/* ============================================================
   GRID SECTION — Editorial Grid (paper-1 body)
   Featured strip top + magazine 3-col grid below.
   ============================================================ */
.arech-news__grid-section {
    background: var(--tdmx-bg, var(--paper-1));
    padding-block: var(--space-6) var(--tdmx-pad-bottom, var(--space-9));
    padding-inline: var(--container-px);
}
@media (min-width: 1024px) { .arech-news__grid-section { padding-bottom: var(--tdmx-pad-bottom, var(--space-10)); } }
.arech-news__grid-inner { max-width: var(--tdmx-max-width, var(--container)); margin-inline: auto; }

/* ---------- Featured article strip ---------- */
.arech-news__featured-card {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
    background: var(--paper-0);
    border: 1px solid var(--hairline);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: var(--space-8);
    text-decoration: none;
    color: inherit;
    transition:
        transform var(--motion-slow) var(--ease-standard),
        box-shadow var(--motion-slow) var(--ease-standard),
        border-color var(--motion-slow) var(--ease-standard);
}
@media (min-width: 768px) {
    .arech-news__featured-card { grid-template-columns: 6fr 4fr; }
}
.arech-news__featured-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(10, 10, 11, 0.08);
    border-color: var(--orange);
}
.arech-news__featured-card:focus-visible { outline: 2px solid var(--orange); outline-offset: 2px; }
.arech-news__featured-card.is-hidden { display: none; }

.arech-news__featured-img-wrap {
    position: relative;
    aspect-ratio: 16 / 9;
    background: var(--paper-3);
    overflow: hidden;
}
.arech-news__featured-img-wrap img,
.arech-news__featured-img-wrap picture {
    width: 100%; height: 100%;
    display: block;
}
.arech-news__featured-img-wrap img {
    object-fit: cover;
    transition: transform var(--motion-slower) var(--ease-standard);
}
.arech-news__featured-card:hover .arech-news__featured-img-wrap img { transform: scale(1.03); }
/* v1.1 fix-pack [M2]: dark on orange = PASS body AA. */
.arech-news__featured-cat-chip {
    position: absolute;
    top: var(--space-4);
    left: var(--space-4);
    padding: 4px 10px;
    background: var(--tdmx-accent, var(--orange));
    color: var(--dark);
    font-family: var(--font-mono);
    font-size: 10px; font-weight: 600;
    letter-spacing: 0.1em; text-transform: uppercase;
    border-radius: 2px;
    z-index: 2;
}
.arech-news__featured-content {
    padding: var(--space-5) var(--space-5) var(--space-6);
    display: flex; flex-direction: column;
    justify-content: center;
    gap: var(--space-3);
}
@media (min-width: 768px) { .arech-news__featured-content { padding: var(--space-6) var(--space-7); } }
.arech-news__featured-eyebrow {
    font-family: var(--font-mono);
    font-size: 10px; font-weight: 500;
    letter-spacing: 0.2em; text-transform: uppercase;
    color: var(--tdmx-accent, var(--orange));
}
.arech-news__featured-title {
    font-family: var(--font-headline);
    font-weight: 600;
    font-size: clamp(24px, 2.6vw, 36px);
    line-height: 1.15;
    letter-spacing: -0.005em;
    color: var(--tdmx-heading, var(--ink-1));
}
.arech-news__featured-lead {
    font-family: var(--font-body);
    font-size: 15px; font-weight: 400;
    line-height: 1.6;
    color: var(--tdmx-text, var(--ink-2));
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.arech-news__featured-meta {
    display: flex; gap: var(--space-4);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.1em; text-transform: uppercase;
    color: var(--ink-3);
    margin-top: var(--space-2);
}
.arech-news__read-more {
    margin-left: auto;
    color: var(--tdmx-accent, var(--orange));
    font-weight: 600;
    transition: color var(--motion-fast) var(--ease-standard);
}
.arech-news__featured-card:hover .arech-news__read-more { color: var(--orange-bright); }

/* ---------- Card grid ---------- */
.arech-news__card-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-5);
}
@media (min-width: 768px)  { .arech-news__card-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-5); } }
@media (min-width: 1024px) { .arech-news__card-grid { grid-template-columns: repeat(3, 1fr); gap: var(--space-6); } }

.arech-news__card {
    display: flex; flex-direction: column;
    background: var(--paper-0);
    border: 1px solid var(--hairline);
    border-radius: 2px;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    transition:
        transform var(--motion-slow) var(--ease-standard),
        box-shadow var(--motion-slow) var(--ease-standard),
        border-color var(--motion-slow) var(--ease-standard),
        opacity var(--motion-reveal) var(--ease-decelerate);
}
/* Progressive enhancement: cards are visible by default. The hidden-then-reveal
   animation only applies once view.js has initialised the block (it sets
   data-arech-news-inited on the root). No JS / JS error → cards stay visible. */
.arech-news[data-arech-news-inited="1"] .arech-news__card:not(.is-revealed) {
    opacity: 0;
    transform: translateY(20px);
}
.arech-news__card.is-revealed { opacity: 1; transform: translateY(0); }
.arech-news__card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 32px rgba(10, 10, 11, 0.08);
    border-color: var(--orange);
}
.arech-news__card:focus-visible { outline: 2px solid var(--orange); outline-offset: 2px; }
.arech-news__card.is-hidden { display: none; }

.arech-news__card-img-wrap {
    position: relative;
    aspect-ratio: 16 / 9;
    background: var(--paper-3);
    overflow: hidden;
}
.arech-news__card-img-wrap img,
.arech-news__card-img-wrap picture {
    width: 100%; height: 100%;
    display: block;
}
.arech-news__card-img-wrap img {
    object-fit: cover;
    transform-origin: center;
    transition: transform var(--motion-slower) var(--ease-standard);
}
.arech-news__card:hover .arech-news__card-img-wrap img { transform: scale(1.03); }
.arech-news__card-cat-chip {
    position: absolute;
    top: var(--space-3);
    left: var(--space-3);
    padding: 4px 10px;
    background: rgba(13, 13, 15, 0.85);
    color: var(--off-white);
    font-family: var(--font-mono);
    font-size: 10px; font-weight: 600;
    letter-spacing: 0.1em; text-transform: uppercase;
    border-radius: 2px;
    z-index: 2;
}

.arech-news__card-body {
    padding: var(--space-5);
    display: flex; flex-direction: column;
    gap: var(--space-3);
    flex: 1;
}
.arech-news__card-date {
    font-family: var(--font-mono);
    font-size: 11px; font-weight: 500;
    letter-spacing: 0.1em; text-transform: uppercase;
    color: var(--tdmx-text, var(--ink-3));
}
.arech-news__card-title {
    font-family: var(--font-headline);
    font-weight: 600;
    font-size: 22px;
    line-height: 1.25;
    letter-spacing: -0.005em;
    color: var(--tdmx-heading, var(--ink-1));
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    position: relative;
}
.arech-news__card-title::after {
    content: '';
    position: absolute;
    left: 0; bottom: -2px;
    width: 0;
    height: 1px;
    background: var(--orange);
    transition: width var(--motion-slow) var(--ease-standard);
}
.arech-news__card:hover .arech-news__card-title::after { width: 100%; }
.arech-news__card-lead {
    font-family: var(--font-body);
    font-size: 14px; font-weight: 400;
    line-height: 1.55;
    color: var(--tdmx-text, var(--ink-2));
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ---------- Empty state ---------- */
.arech-news__empty-state {
    display: none;
    text-align: center;
    padding: var(--space-9) var(--space-5);
    background: var(--paper-0);
    border: 1px dashed var(--hairline-strong);
    border-radius: 2px;
}
.arech-news__empty-state.is-visible { display: block; }
.arech-news__empty-state h3 {
    font-family: var(--font-headline);
    font-weight: 600;
    font-size: 24px;
    color: var(--ink-1);
    margin-bottom: var(--space-3);
}
.arech-news__empty-state p {
    font-family: var(--font-body);
    font-size: 15px;
    color: var(--ink-3);
    max-width: 48ch;
    margin: 0 auto var(--space-5);
}
.arech-news__clear-btn {
    display: inline-flex; align-items: center;
    min-height: 44px;
    padding: 10px 24px;
    background: var(--ink-1);
    color: var(--paper-0);
    font-family: var(--font-mono);
    font-size: 12px; font-weight: 600;
    letter-spacing: 0.1em; text-transform: uppercase;
    border: 1px solid var(--ink-1);
    border-radius: 2px;
    cursor: pointer;
    transition: background var(--motion-fast) var(--ease-standard), color var(--motion-fast) var(--ease-standard);
}
.arech-news__clear-btn:hover { background: var(--orange); border-color: var(--orange); }
.arech-news__clear-btn:focus-visible { outline: 2px solid var(--orange); outline-offset: 2px; }

/* ============================================================
   REDUCED MOTION — kill transforms / scale / reveal animation
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
    .arech-news__card { opacity: 1 !important; transform: none !important; }
    .arech-news__card:hover,
    .arech-news__featured-card:hover { transform: none !important; box-shadow: none !important; }
    .arech-news__card-img-wrap img,
    .arech-news__featured-img-wrap img { transform: none !important; }
    .arech-news__card-title::after { transition: none !important; }
}


/* ============================================================
   ARECH Footer block — front-end styles.

   Port of the FOOTER in
     prototypes/footer-explore-2026-05-19/footer-A-classic.html
   re-tokenized to the theme tokens (main.css :root) and corrected to the
   responsive standard (responsive_manual_en_0.1):
     • min-width media queries ONLY (no max-width);
     • the prototype's --container-wide:1440 inner becomes the canonical
       container box (--container 1140/1200 + --container-px gutter) so the
       footer caps identically to the navbar + page content;
     • subtle white hairlines use color-mix() (modern CSS, S72 direction);
     • small body text uses --muted-accessible / --light for WCAG AA contrast
       (the prototype's flat --muted #6b6b75 fails 4.5:1 on --dark-2).

   ALL rules are scoped under `.arech-footer` so nothing leaks into the theme.
   ============================================================ */

.arech-footer {
    background: var(--dark-2);
    border-top: 1px solid color-mix(in oklch, var(--white) 4%, transparent);
    padding-block: var(--space-9) var(--space-7);
    color: var(--light);
    font-family: var(--font-body);
}

.arech-footer__inner {
    max-width: calc(var(--container) + 2 * var(--container-px));
    margin-inline: auto;
    padding-inline: var(--container-px);
}

/* -------- COLUMN GRID -------- */
.arech-footer__cols {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
}
@media (min-width: 768px) {
    .arech-footer__cols {
        grid-template-columns: 1fr 1fr 1fr;
        grid-template-areas:
            "brand brand brand"
            "products company legal";
        gap: var(--space-5);
    }
    .arech-footer__col--brand    { grid-area: brand; }
    .arech-footer__col--products { grid-area: products; }
    .arech-footer__col--company  { grid-area: company; }
    .arech-footer__col--legal    { grid-area: legal; }
}
@media (min-width: 1024px) {
    .arech-footer__cols {
        grid-template-columns: 2fr 1fr 1fr 1fr;
        grid-template-areas: "brand products company legal";
        gap: var(--space-6);
    }
}

/* Discrete vertical separators sitting in the middle of the column gap. */
@media (min-width: 768px) {
    .arech-footer__col--company,
    .arech-footer__col--legal { position: relative; }
    .arech-footer__col--company::before,
    .arech-footer__col--legal::before {
        content: '';
        position: absolute;
        inset-inline-start: calc(var(--space-5) / -2);
        inset-block: 0;
        inline-size: 1px;
        background: color-mix(in oklch, var(--white) 6%, transparent);
    }
}
@media (min-width: 1024px) {
    .arech-footer__col--products { position: relative; }
    .arech-footer__col--products::before {
        content: '';
        position: absolute;
        inset-inline-start: calc(var(--space-6) / -2);
        inset-block: 0;
        inline-size: 1px;
        background: color-mix(in oklch, var(--white) 6%, transparent);
    }
    .arech-footer__col--company::before,
    .arech-footer__col--legal::before {
        inset-inline-start: calc(var(--space-6) / -2);
    }
}

/* -------- BRAND COLUMN -------- */
.arech-footer__col--brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}
.arech-footer__logo {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    text-decoration: none;
    align-self: flex-start;
}
.arech-footer__logo:focus-visible {
    outline: 2px solid var(--orange);
    outline-offset: 2px;
}
.arech-footer__logo-img {
    height: 44px;
    width: auto;
    display: block;
}
.arech-footer__tagline {
    font-style: italic;
    font-weight: 300;
    font-size: 14px;
    line-height: 1.6;
    color: var(--muted-accessible);
    max-width: 42ch;
    margin: 0;
}

/* Social media row */
.arech-footer__social {
    list-style: none;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin: 0;
    padding: 0;
}
.arech-footer__social a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    color: var(--muted-accessible);
    text-decoration: none;
    border-radius: var(--radius-xs);
    transition: color var(--motion-fast) var(--ease-standard),
                background var(--motion-fast) var(--ease-standard);
}
.arech-footer__social a:hover,
.arech-footer__social a:focus-visible {
    color: var(--off-white);
    background: color-mix(in oklch, var(--white) 5%, transparent);
}
.arech-footer__social a:focus-visible {
    outline: 2px solid var(--orange);
    outline-offset: 2px;
}
.arech-footer__social svg {
    width: 18px;
    height: 18px;
    display: block;
}

/* -------- LINK COLUMNS -------- */
.arech-footer__head {
    font-family: var(--font-headline);
    font-weight: 500;
    font-size: 20px;
    line-height: 1.3;
    color: var(--off-white);
    margin: 0 0 var(--space-5);
}
.arech-footer__links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin: 0;
    padding: 0;
}
.arech-footer__links a {
    display: inline-flex;
    align-items: center;
    min-height: 24px;
    font-size: 14px;
    font-weight: 400;
    color: var(--light);
    text-decoration: none;
    transition: color var(--motion-fast) var(--ease-standard);
}
.arech-footer__links a:hover,
.arech-footer__links a:focus-visible { color: var(--off-white); }
.arech-footer__links a:focus-visible {
    outline: 2px solid var(--orange);
    outline-offset: 2px;
}
.arech-footer__links .arech-footer__all {
    color: var(--orange);
    font-weight: 500;
    margin-top: var(--space-2);
}
.arech-footer__links .arech-footer__all:hover,
.arech-footer__links .arech-footer__all:focus-visible { color: var(--orange-bright); }

/* -------- BASE ROW -------- */
.arech-footer__base {
    margin-top: var(--space-8);
    padding-top: var(--space-7);
    border-top: 1px solid color-mix(in oklch, var(--white) 4%, transparent);
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-5);
}
@media (min-width: 1024px) {
    .arech-footer__base {
        grid-template-columns: 1fr auto;
        align-items: start;
        gap: var(--space-8);
    }
}
.arech-footer__copyright {
    font-size: 13px;
    line-height: 1.55;
    color: var(--muted-accessible);
    max-width: 60ch;
    margin: 0;
}
.arech-footer__addresses {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-family: var(--font-mono);
    font-size: 11px;
    line-height: 1.7;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted-accessible);
    font-style: normal;
}
@media (min-width: 1024px) {
    .arech-footer__addresses {
        text-align: end;
        align-items: flex-end;
    }
}

/* Images inside the footer never overflow (responsive standard §). */
.arech-footer img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* -------- TDM CREDIT (discreet build attribution) -------- */
.arech-footer__credit {
    margin-top: var(--space-6);
    padding-top: var(--space-5);
    border-top: 1px solid color-mix(in oklch, var(--white) 4%, transparent);
    display: flex;
    justify-content: flex-end;
}
.arech-footer__credit-link {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    padding-block: var(--space-2);
    border-radius: var(--radius-xs);
    text-decoration: none;
}
/* Gray by default, true colours only on hover/focus (discreet credit).
   Two-class selector so `height` beats the global `.arech-footer img`
   rule (which is class+type = higher specificity than a single class). */
.arech-footer__credit .arech-footer__credit-logo {
    height: 58px;
    width: auto;
    display: block;
    filter: grayscale(1);
    opacity: 0.45;
    transition: filter var(--motion-fast) var(--ease-standard),
                opacity var(--motion-fast) var(--ease-standard);
}
.arech-footer__credit-link:hover .arech-footer__credit-logo,
.arech-footer__credit-link:focus-visible .arech-footer__credit-logo {
    filter: grayscale(0);
    opacity: 1;
}
.arech-footer__credit-link:focus-visible {
    outline: 2px solid var(--orange);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    .arech-footer__social a { transition: none; }
    .arech-footer__links a { transition: none; }
    .arech-footer__credit-logo { transition: none; }
}


/* ============================================================================
   TDM Back To Top — view styles. Ported from prototypes/back-to-top/index.html
   (v1.0), re-namespaced .btt-* → .tdm-btt-*, driven by data-* attributes
   (model / theme / shape / size / position) + changed-only scoped custom props
   (--tdm-btt-icon / --tdm-btt-bg / --tdm-btt-size / --tdm-btt-bd-w/-c) that fall
   back to the theme presets below. Modern CSS on purpose: conic-gradient,
   color-mix, :has() not required. Brand tokens come from tdm_blocks/tokens.css.
   ============================================================================ */

/* The reveal sentinel — an invisible 1px marker placed at the threshold; the
   IntersectionObserver in view.js toggles .is-visible on the button. */
.tdm-btt-sentinel {
  position: absolute;
  left: 0;
  width: 1px;
  height: 1px;
  pointer-events: none;
  /* `top` is set inline from the reveal_threshold setting. */
}

/* ---------------------------------------------------------------------------
   1. Base button — fixed, hidden until revealed. Defaults via custom props so
      the changed-only inline <style> can override per instance.
   --------------------------------------------------------------------------- */
.tdm-btt {
  /* size + hit area (kept >= 44px even at S 40 via min-width/height) */
  --tdm-btt-size: 48px;
  --tdm-btt-hit: 48px;
  --tdm-btt-radius: 50%;
  --tdm-btt-bd-w: 0px;
  --tdm-btt-bd-c: transparent;
  --tdm-btt-inset: var(--tdm-space-5, 24px);
  --tdm-btt-p: 0; /* scroll progress 0..1 for the gauge */

  position: fixed;
  z-index: 8000;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: var(--tdm-btt-hit);
  min-height: var(--tdm-btt-hit);
  padding: 0;
  margin: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  font-family: var(--tdm-font-mono, system-ui, sans-serif);

  /* reveal state (hidden + out of tab order until shown) */
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition:
    opacity var(--tdm-dur-base, 250ms) var(--tdm-ease-standard, ease),
    transform var(--tdm-dur-base, 250ms) var(--tdm-ease-emphatic, ease),
    visibility 0s linear var(--tdm-dur-base, 250ms);
}

.tdm-btt.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition:
    opacity var(--tdm-dur-base, 250ms) var(--tdm-ease-standard, ease),
    transform var(--tdm-dur-slow, 400ms) var(--tdm-ease-emphatic, ease);
}

/* size keys (the inline override sets --tdm-btt-size; we also pad the hit area) */
.tdm-btt[data-size="s"] { --tdm-btt-size: 40px; --tdm-btt-hit: 44px; }
.tdm-btt[data-size="m"] { --tdm-btt-size: 48px; --tdm-btt-hit: 48px; }
.tdm-btt[data-size="l"] { --tdm-btt-size: 56px; --tdm-btt-hit: 56px; }

/* ---------------------------------------------------------------------------
   2. Theme presets — seed --tdm-btt-bg / --tdm-btt-icon / --tdm-btt-ring.
      The changed-only inline <style> overrides --tdm-btt-bg / --tdm-btt-icon
      when the operator sets an explicit colour.
   --------------------------------------------------------------------------- */
.tdm-btt[data-theme="dark"] {
  --tdm-btt-bg: var(--tdm-color-accent, #E8651A);
  --tdm-btt-icon: var(--tdm-color-ink, #F5F4F0);
  --tdm-btt-ring: var(--tdm-color-accent, #E8651A);
}
.tdm-btt[data-theme="light"] {
  --tdm-btt-bg: #FFFFFF;
  --tdm-btt-icon: #B84A0C; /* AA-safe orange-link on paper */
  --tdm-btt-ring: #B84A0C;
}

/* ---------------------------------------------------------------------------
   3. Shape → radius (data-shape). Gauge + pillar override internally below.
   --------------------------------------------------------------------------- */
.tdm-btt[data-shape="circle"]  { --tdm-btt-radius: 50%; }
.tdm-btt[data-shape="rounded"] { --tdm-btt-radius: var(--tdm-radius-md, 6px); }
.tdm-btt[data-shape="square"]  { --tdm-btt-radius: 2px; }
.tdm-btt[data-shape="pill"]    { --tdm-btt-radius: calc(var(--tdm-btt-size) / 2); }

/* ---------------------------------------------------------------------------
   4. Position presets — inset clears the mobile address bar.
   --------------------------------------------------------------------------- */
.tdm-btt[data-position="bottom-right"]  { right: var(--tdm-btt-inset); bottom: max(var(--tdm-btt-inset), env(safe-area-inset-bottom)); left: auto; }
.tdm-btt[data-position="bottom-left"]   { left: var(--tdm-btt-inset); bottom: max(var(--tdm-btt-inset), env(safe-area-inset-bottom)); right: auto; }
.tdm-btt[data-position="bottom-center"] { left: 50%; bottom: max(var(--tdm-btt-inset), env(safe-area-inset-bottom)); right: auto; transform: translateX(-50%) translateY(12px); }
.tdm-btt[data-position="bottom-center"].is-visible { transform: translateX(-50%) translateY(0); }

@media (min-width: 768px) {
  .tdm-btt { --tdm-btt-inset: var(--tdm-space-6, 32px); }
}

/* ---------------------------------------------------------------------------
   5. The visible "face" — the coloured chip the user sees.
   --------------------------------------------------------------------------- */
.tdm-btt__face {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--tdm-btt-size);
  height: var(--tdm-btt-size);
  border-radius: var(--tdm-btt-radius);
  background: var(--tdm-btt-bg);
  border: var(--tdm-btt-bd-w) solid var(--tdm-btt-bd-c);
  color: var(--tdm-btt-icon);
  transition:
    background var(--tdm-dur-base, 250ms) var(--tdm-ease-standard, ease),
    transform var(--tdm-dur-base, 250ms) var(--tdm-ease-standard, ease),
    box-shadow var(--tdm-dur-base, 250ms) var(--tdm-ease-standard, ease);
}
.tdm-btt:hover  .tdm-btt__face { transform: translateY(-2px); box-shadow: 0 8px 22px color-mix(in srgb, #000 35%, transparent); }
.tdm-btt:active .tdm-btt__face { transform: translateY(0); }
.tdm-btt:focus-visible { outline: none; }
.tdm-btt:focus-visible .tdm-btt__face { box-shadow: 0 0 0 3px color-mix(in srgb, var(--tdm-btt-ring) 80%, transparent); }

.tdm-btt__disc { display: inline-flex; align-items: center; justify-content: center; }
.tdm-btt__icon { width: 45%; height: 45%; display: block; line-height: 0; }
.tdm-btt__icon svg { width: 100%; height: 100%; display: block; }

/* stacked label (model 3) — hidden by default */
.tdm-btt__label {
  display: none;
  font-family: var(--tdm-font-mono, system-ui, sans-serif);
  font-weight: 500;
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-top: 2px;
  color: var(--tdm-btt-icon);
  line-height: 1;
}

/* live % readout (gauge) — hidden by default */
.tdm-btt__pct {
  display: none;
  position: absolute;
  inset: 0;
  align-items: center;
  justify-content: center;
  font-family: var(--tdm-font-mono, system-ui, sans-serif);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--tdm-btt-icon);
}

/* ---------------------------------------------------------------------------
   MODEL: scroll-gauge (conic progress ring)
   --------------------------------------------------------------------------- */
.tdm-btt[data-model="scroll-gauge"] .tdm-btt__face { border-radius: 50%; background: transparent; padding: 0; }
.tdm-btt[data-model="scroll-gauge"] .tdm-btt__ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(
    var(--tdm-btt-ring) calc(var(--tdm-btt-p) * 360deg),
    color-mix(in srgb, var(--tdm-btt-ring) 22%, transparent) 0
  );
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 4px), #000 calc(100% - 3px));
          mask: radial-gradient(farthest-side, transparent calc(100% - 4px), #000 calc(100% - 3px));
}
.tdm-btt[data-model="scroll-gauge"] .tdm-btt__disc {
  position: absolute;
  inset: 5px;
  border-radius: 50%;
  background: var(--tdm-btt-bg);
}
.tdm-btt[data-model="scroll-gauge"] .tdm-btt__icon { width: 42%; height: 42%; }
.tdm-btt[data-model="scroll-gauge"].show-pct .tdm-btt__icon { opacity: 0; }
.tdm-btt[data-model="scroll-gauge"].show-pct .tdm-btt__pct { display: inline-flex; }

/* The ring/disc are only meaningful for the gauge — hide for other models. */
.tdm-btt:not([data-model="scroll-gauge"]) .tdm-btt__ring { display: none; }

/* ---------------------------------------------------------------------------
   MODEL: edge-pillar (half-pill welded to the edge)
   --------------------------------------------------------------------------- */
.tdm-btt[data-model="edge-pillar"] { bottom: 50%; }
.tdm-btt[data-model="edge-pillar"][data-position="bottom-right"]  { right: 0; left: auto; transform: translateY(40px); }
.tdm-btt[data-model="edge-pillar"][data-position="bottom-right"].is-visible { transform: translateY(0); }
.tdm-btt[data-model="edge-pillar"][data-position="bottom-left"]   { left: 0; right: auto; transform: translateY(40px); }
.tdm-btt[data-model="edge-pillar"][data-position="bottom-left"].is-visible  { transform: translateY(0); }
.tdm-btt[data-model="edge-pillar"][data-position="bottom-center"] { left: 0; right: auto; transform: translateY(40px); } /* center N/A → docks left */
.tdm-btt[data-model="edge-pillar"][data-position="bottom-center"].is-visible { transform: translateY(0); }
.tdm-btt[data-model="edge-pillar"] .tdm-btt__face {
  width: calc(var(--tdm-btt-size) * 0.74);
  height: calc(var(--tdm-btt-size) * 1.9);
  border-radius: 10px 0 0 10px; /* rounded only on the inboard side */
}
.tdm-btt[data-model="edge-pillar"][data-position="bottom-left"] .tdm-btt__face,
.tdm-btt[data-model="edge-pillar"][data-position="bottom-center"] .tdm-btt__face { border-radius: 0 10px 10px 0; }
.tdm-btt[data-model="edge-pillar"]:hover .tdm-btt__face { transform: translateX(-3px); }
.tdm-btt[data-model="edge-pillar"][data-position="bottom-left"]:hover .tdm-btt__face,
.tdm-btt[data-model="edge-pillar"][data-position="bottom-center"]:hover .tdm-btt__face { transform: translateX(3px); }

/* ---------------------------------------------------------------------------
   MODEL: stacked-label
   --------------------------------------------------------------------------- */
.tdm-btt[data-model="stacked-label"] .tdm-btt__face {
  flex-direction: column;
  gap: 1px;
  width: auto;
  min-width: var(--tdm-btt-size);
  height: auto;
  min-height: var(--tdm-btt-size);
  padding: 8px 12px;
}
.tdm-btt[data-model="stacked-label"] .tdm-btt__disc { flex-direction: column; }
.tdm-btt[data-model="stacked-label"] .tdm-btt__icon { width: 18px; height: 18px; }
.tdm-btt[data-model="stacked-label"] .tdm-btt__label { display: block; }

/* ---------------------------------------------------------------------------
   MODEL: notch-riser (rises from below with overshoot)
   --------------------------------------------------------------------------- */
.tdm-btt[data-model="notch-riser"][data-position="bottom-right"],
.tdm-btt[data-model="notch-riser"][data-position="bottom-left"] { transform: translateY(140%); }
.tdm-btt[data-model="notch-riser"][data-position="bottom-center"] { transform: translateX(-50%) translateY(140%); }
.tdm-btt[data-model="notch-riser"].is-visible[data-position="bottom-right"],
.tdm-btt[data-model="notch-riser"].is-visible[data-position="bottom-left"] {
  transform: translateY(0);
  transition: transform var(--tdm-dur-slow, 400ms) var(--tdm-ease-emphatic, cubic-bezier(0.34, 1.56, 0.64, 1)),
              opacity var(--tdm-dur-base, 250ms) var(--tdm-ease-standard, ease);
}
.tdm-btt[data-model="notch-riser"].is-visible[data-position="bottom-center"] {
  transform: translateX(-50%) translateY(0);
  transition: transform var(--tdm-dur-slow, 400ms) var(--tdm-ease-emphatic, cubic-bezier(0.34, 1.56, 0.64, 1)),
              opacity var(--tdm-dur-base, 250ms) var(--tdm-ease-standard, ease);
}
.tdm-btt[data-model="notch-riser"] .tdm-btt__face { border-radius: min(var(--tdm-btt-radius), 6px); }

/* MODEL: plain-chevron uses the base .tdm-btt__face as-is — nothing special. */

/* ---------------------------------------------------------------------------
   Reduced motion: no overshoot, no float, no transform reveal — fade only.
   Reveal still works; scroll is instant (handled in view.js).
   --------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .tdm-btt,
  .tdm-btt.is-visible,
  .tdm-btt[data-model="notch-riser"].is-visible[data-position="bottom-right"],
  .tdm-btt[data-model="notch-riser"].is-visible[data-position="bottom-left"] {
    transform: none !important;
    transition: opacity var(--tdm-dur-base, 250ms) linear, visibility 0s !important;
  }
  .tdm-btt[data-position="bottom-center"],
  .tdm-btt[data-position="bottom-center"].is-visible { transform: translateX(-50%) !important; }
  .tdm-btt:hover .tdm-btt__face,
  .tdm-btt[data-model="edge-pillar"]:hover .tdm-btt__face { transform: none; }
}