/* ============================================================================
   responsive.css — mobile & tablet layer for Sam Set Events (B+)
   Additive only: loaded after base/dir-b/site-b so it overrides for small
   screens. The desktop (≥921px) experience is unchanged.
   Breakpoints: 920px (tablet) · 600px (phone).
   ========================================================================== */

/* ---- global: never scroll sideways; media stays inside its box ---- */
/* clip (not hidden) so horizontal overflow is contained without breaking position:sticky */
html { overflow-x: clip; background: var(--ivory); }
.db img, .bx img, .ph { max-width: 100%; }

/* Sticky frosted main navigation (premium glass effect) */
.db-nav {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in oklab, var(--ivory) 80%, transparent);
  -webkit-backdrop-filter: saturate(150%) blur(14px);
  backdrop-filter: saturate(150%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: padding .3s ease, background .3s ease, border-color .3s ease, box-shadow .35s ease;
}
.bx .db-nav { border-bottom-color: transparent; }   /* borderless over the hero */
.db-brand img { transition: height .3s ease; }
/* Once scrolled: condense, add a gold hairline + soft shadow */
.db-nav.scrolled {
  padding-top: 13px; padding-bottom: 13px;
  background: color-mix(in oklab, var(--ivory) 92%, transparent);
  border-bottom-color: var(--goldline);
  box-shadow: 0 10px 30px -20px color-mix(in oklab, var(--burgundy) 55%, transparent);
}
.db-nav.scrolled .db-brand img { height: 36px; }

/* Portfolio service navigation links */
.bx-svc-links {
  display: grid; grid-template-columns: 1fr 1fr;
  border-top: 1px solid color-mix(in oklab, var(--burgundy) 14%, transparent);
  margin-top: 44px; max-width: 580px; width: 100%;
}
.svc-link {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 15px 0;
  border-bottom: 1px solid color-mix(in oklab, var(--burgundy) 10%, transparent);
  font: 400 11px/1 var(--sans-b); letter-spacing: 0.13em; text-transform: uppercase;
  color: var(--burgundy); text-decoration: none;
  transition: color .2s ease;
}
.svc-link:nth-child(odd) { padding-right: 32px; }
.svc-link:nth-child(even) { padding-left: 32px; border-left: 1px solid color-mix(in oklab, var(--burgundy) 10%, transparent); }
.svc-link svg { flex-shrink: 0; opacity: 0.45; transition: transform .2s ease, opacity .2s ease; }
.svc-link:hover { color: var(--rose); }
.svc-link:hover svg { transform: translateX(3px); opacity: 1; }

/* Social icon links (footer + mobile menu) */
.ss-social { display: flex; align-items: center; gap: 14px; }
.ss-social a, .ss-social .ss-icon { display: inline-flex; color: inherit; transition: color .2s ease, transform .2s ease; }
.ss-social a:hover { transform: translateY(-1px); }
.ss-social svg { width: 22px; height: 22px; display: block; }
.ss-social-li { margin-top: 4px; }
.db-footer .ss-social a, .db-footer .ss-social .ss-icon { color: var(--ivory); }
.db-footer .ss-social a:hover { color: var(--gold); }
.db-nav nav .ss-social { display: none; }   /* shown only inside the mobile overlay */
.db-nav nav .ss-social a, .db-nav nav .ss-social .ss-icon { color: var(--burgundy); }
.db-nav nav .ss-social a:hover { color: var(--rose); }

/* ---- hamburger button (hidden on desktop, shown ≤920px) ---- */
.db-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px; height: 44px;
  padding: 10px;
  margin: -10px -10px -10px 0;
  background: none; border: none; cursor: pointer;
  box-sizing: border-box;
}
.db-burger span {
  display: block; height: 2px; width: 100%;
  background: var(--burgundy); border-radius: 2px;
  transition: transform .25s ease, opacity .2s ease;
}
.db-nav.nav-open .db-burger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.db-nav.nav-open .db-burger span:nth-child(2) { opacity: 0; }
.db-nav.nav-open .db-burger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================ TABLET ≤ 920px ============================ */
@media (max-width: 920px) {
  /* nav → elegant full-screen overlay menu */
  .db-nav { padding: 20px 28px; }
  .db-nav.nav-open { background: transparent; border: none; -webkit-backdrop-filter: none; backdrop-filter: none; }
  .db-burger { display: inline-flex; position: relative; z-index: 70; }
  .db-nav nav {
    position: fixed; inset: 0;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    gap: 2px;
    background: radial-gradient(125% 80% at 50% 0%, color-mix(in oklab, var(--blush) 30%, var(--ivory)), var(--ivory) 72%);
    opacity: 0; visibility: hidden; transform: translateY(-12px);
    transition: opacity .4s ease, transform .4s ease, visibility .4s;
    z-index: 55;
  }
  .db-nav nav a {
    font: 500 30px/1.35 var(--serif-b); color: var(--burgundy);
    letter-spacing: 0.01em; padding: 11px 0; opacity: 0.92;
  }
  .db-nav nav a.active { color: var(--rose); }
  .db-nav nav .ss-social { display: flex; margin-top: 26px; gap: 22px; }
  .db-nav nav .ss-social svg { width: 26px; height: 26px; }
  .db-nav > .btn { display: none; }
  .db-nav.nav-open nav { opacity: 1; visibility: visible; transform: none; }
  .db-nav.nav-open .db-brand { position: fixed; top: 18px; left: 26px; z-index: 70; }
  .db-nav.nav-open .db-burger { position: fixed; top: 22px; right: 26px; z-index: 70; }
  .db-nav.nav-open > .btn {
    display: inline-flex; position: fixed; left: 50%; bottom: 8vh; transform: translateX(-50%);
    z-index: 65; min-width: 230px; justify-content: center;
  }

  /* 3-up grids → 2-up */
  .db-svc-grid, .db-testi-grid, .db-journal-grid,
  .bx-values, .db-gallery { grid-template-columns: repeat(2, 1fr); }
  .db-proc-grid { grid-template-columns: repeat(2, 1fr); }
  .db-proc-grid::before { display: none; }
  .bx-masonry { columns: 2; }

  /* 2-up split sections → stacked */
  .db-story, .db-why, .bx-fstory, .db-approach,
  .bx-contact, .bx-featured, .bx-case-grid, .bx-news,
  .db-incl-grid, .db-founder { grid-template-columns: 1fr; }
  .db-founder { gap: 48px; text-align: center; }
  .db-founder .ph { margin: 0 auto; }

  /* footer 4-up → 2-up */
  .db-footer .cols { grid-template-columns: 1fr 1fr; gap: 40px; }

  /* trim oversized side gaps */
  .db-story, .db-founder { margin: 0 24px; padding: 64px 48px; }
  .db-sec { padding: 80px 32px; }
}

/* ============================ PHONE ≤ 600px ============================ */
@media (max-width: 600px) {
  /* fluid display type */
  .db-hero .display { font-size: clamp(38px, 11.5vw, 80px); line-height: 1.08; }
  .bx-pagehero .display { font-size: clamp(32px, 9.5vw, 68px); }
  .db-whero .display { font-size: clamp(38px, 11vw, 84px); }
  .db-sechead .display, .db-story .display, .db-why .display { font-size: clamp(27px, 7.5vw, 46px); }
  .db-cta .display { font-size: clamp(30px, 8.5vw, 52px); }
  .bx-404 .display { font-size: clamp(34px, 9vw, 64px); }
  .bx-featured h3 { font-size: clamp(26px, 7vw, 36px); }
  .db-founder blockquote { font-size: clamp(21px, 5.8vw, 30px); }
  .db-lede, .db .lede { font-size: 16px; }

  /* everything to a single column */
  .db-svc-grid, .db-proc-grid, .db-testi-grid, .db-journal-grid,
  .bx-values, .db-gallery, .db-footer .cols,
  .bx-form .grid { grid-template-columns: 1fr; }
  .bx-masonry { columns: 1; }

  /* topbar: let it wrap, shrink, ease the tracking */
  .bx-topbar {
    flex-wrap: wrap; justify-content: center; gap: 4px 16px;
    padding: 9px 20px; font-size: 9px; letter-spacing: 0.12em; text-align: center;
  }

  /* section + container spacing */
  .db-nav { padding: 16px 20px; }
  .db-hero { padding: 52px 20px 0; }
  .db-trust { padding: 44px 20px; }
  .db-trust .logos { flex-wrap: wrap; gap: 16px 28px; }
  .db-sec { padding: 56px 20px; }
  .bx-pagehero { padding: 48px 20px 32px; }
  .bx-pagehero.tight { padding-bottom: 28px; }
  .db-whero { padding: 56px 20px 0; }
  .bx-divider { margin: 0 20px; }
  .db-story, .db-founder { margin: 0 14px; padding: 48px 26px; border-radius: 32px; }
  .db-cta-wrap { padding: 0 14px 64px; }
  .db-cta { padding: 64px 26px; border-radius: 32px; }
  .db-footer { padding: 0 22px; }
  .db-footer .cols { gap: 36px; padding: 56px 0 44px; }
  .db-footer .legal { flex-direction: column; gap: 14px; text-align: center; }
  .db-footer .legal .links { justify-content: center; }

  /* forms / newsletter: stack + full width */
  .bx-form { padding: 32px 22px; }
  .bx-news { padding: 44px 26px; }
  .bx-news .row { flex-direction: column; }
  .bx-news input { width: 100%; box-sizing: border-box; }
  .bx-news .row .btn { width: 100%; justify-content: center; box-sizing: border-box; }
  .bx-featured .body { padding: 32px 26px; }

  /* fixed-width image rows → fluid, wrapped */
  .db-hero-arches { flex-wrap: wrap; gap: 12px; margin-top: 44px; }
  .db-hero-arches .ph { width: 46% !important; height: auto !important; aspect-ratio: 3 / 4 !important; }
  .db-hero .dot { display: none !important; }
  .db-port-row { flex-wrap: wrap; gap: 12px; margin: 40px 0; }
  .db-port-row .ph { width: 46% !important; height: auto !important; aspect-ratio: 3 / 4 !important; }

  /* buttons comfortable to tap, ctas stack */
  .db-hero .ctas { flex-direction: column; align-items: center; }
  .db-hero .ctas .btn { width: 100%; max-width: 320px; justify-content: center; }
  .db-cta .btn { width: 100%; max-width: 320px; justify-content: center; }
}