/* design-systems/mobile-responsive.css
   ─────────────────────────────────────────────────────────────────────
   Universal mobile responsive layer for the design-system showcase
   project. Loaded AFTER each DS's _shared.css; rules only apply at
   <=768px so desktop is mathematically untouched. Pairs with
   ../mobile-nav.js (which auto-injects the hamburger button).

   Supported nav patterns (from auditing all 15 DSes):
     A — `.nav` with `.lockup` + `<ul>` + `.right`
         (imperial-shinez, demarco, prime-wellness)
     B — `.nav` with `.nav-brand` + `.nav-links` (CTA inline as a child)
         (sbc, n50, ecosia-light, master-craftsmen, ymca, ymca-montgomery,
          goettl, ps-edu)
     C — `.nav` with `.container > .nav-shell` wrapper + `.nav-buttons`
         (centimark, lightsource-bp)
     D — `.nav` with `.container > .brand-mark` (horizon-fix custom)
     E — `.nav-mc` (mc — different root class)
   ───────────────────────────────────────────────────────────────────── */

/* ─── Hamburger button — base styles, hidden until @media kicks in ─── */
.nav-burger {
  display: none;
  background: transparent;
  border: 1px solid var(--border, rgba(0, 0, 0, 0.15));
  border-radius: 10px;
  width: 40px;
  height: 40px;
  padding: 0;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--ink, #1a1a1a);
}
.nav-burger span {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  position: relative;
  transition: background 200ms ease;
}
.nav-burger span::before,
.nav-burger span::after {
  content: '';
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: top 240ms ease, transform 240ms ease;
}
.nav-burger span::before { top: -6px; }
.nav-burger span::after  { top:  6px; }

/* On dark navs, recolor bars to white. Covers .over-dark, .over-photo,
   .nav-mc.dark — the canonical dark-nav modifiers across the project. */
.nav.over-dark .nav-burger,
.nav.over-photo .nav-burger,
.nav-mc.dark .nav-burger,
.nav-mc .nav-burger {
  border-color: rgba(255, 255, 255, 0.4);
  color: #fff;
}

@media (max-width: 768px) {

  /* ═══════════════════════════════════════════════════════════════════
     TOKENS — shrink the spacing scale for phones. Each DS uses these
     custom properties throughout, so changing them here cascades into
     section padding, container gutters, etc., without touching components.
     ═══════════════════════════════════════════════════════════════════ */
  :root {
    --gutter: 1rem;
    --section: 64px;
    --section-sm: 44px;
    --section-lg: 88px;
  }

  /* ═══════════════════════════════════════════════════════════════════
     SHOW & ANIMATE HAMBURGER
     ═══════════════════════════════════════════════════════════════════ */
  .nav-burger { display: inline-flex; }
  body.nav-open .nav-burger span { background: transparent; }
  body.nav-open .nav-burger span::before { top: 0; transform: rotate(45deg); }
  body.nav-open .nav-burger span::after  { top: 0; transform: rotate(-45deg); }
  body.nav-open { overflow: hidden; }

  /* ═══════════════════════════════════════════════════════════════════
     HIDE SHOWCASE CHROME
     `#ds-back-link` (injected by ../palette-toggle.js) and the
     `.palette-toggle` panel both overlap the brand layout at phone
     widths and aren't useful here. `.ds-back` is the manual variant
     used by horizon-fix (and any DS that ships its own back link in
     the HTML rather than relying on the JS injection).
     ═══════════════════════════════════════════════════════════════════ */
  #ds-back-link,
  .ds-back,
  .palette-toggle { display: none !important; }

  /* ═══════════════════════════════════════════════════════════════════
     NAV BAR — universal layout (Patterns A/B/D/E)
     `backdrop-filter` and `filter` (used by some DSes for translucent
     navs) create a new containing block for fixed-position descendants,
     which would size the drawer to the nav's height instead of the
     viewport. Disable both at mobile so the drawer can fill the screen.
     ═══════════════════════════════════════════════════════════════════ */
  .nav,
  .nav-mc {
    padding: 12px 16px;
    gap: 10px;
    flex-wrap: nowrap;
    align-items: center;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    filter: none;
  }
  /* Logo sizing — covers the four brand wrappers used across DSes */
  .nav .lockup img,
  .nav .nav-brand img,
  .nav-mc .nav-brand img,
  .nav .container .brand-mark img,
  .nav .nav-shell .nav-brand img,
  .nav-mc .lockup img {
    height: 40px;
    max-width: 160px;
    width: auto;
  }
  .nav .lockup .word,
  .nav-mc .nav-brand,
  .nav-mc .lockup .word {
    font-size: 16px;
  }

  /* ═══════════════════════════════════════════════════════════════════
     PATTERN C — wrapper nav (centimark, lightsource-bp)
     The nav itself doesn't have flex padding — the inner .container does.
     centimark uses `display: grid; grid-template-columns: auto 1fr auto`
     on .nav-shell, which can't fit 4 children (brand + drawer + burger +
     buttons). Force flex layout at mobile so the items lay out cleanly.
     ═══════════════════════════════════════════════════════════════════ */
  .nav > .container { padding: 12px 16px; }
  .nav .nav-shell {
    display: flex;
    flex-wrap: nowrap;
    gap: 10px;
    align-items: center;
    padding: 8px 12px;
    grid-template-columns: none;   /* unset any desktop grid template */
  }
  .nav .nav-shell .nav-brand { flex: 0 1 auto; min-width: 0; }
  .nav .nav-buttons {
    flex-shrink: 0;
    gap: 8px;
    margin-left: auto;             /* pin CTA buttons to the right */
  }
  .nav .nav-buttons .btn {
    padding: 10px 14px;
    font-size: 12px;
  }

  /* ═══════════════════════════════════════════════════════════════════
     PATTERN A DRAWER — `.nav > ul`
     ═══════════════════════════════════════════════════════════════════ */
  .nav > ul,
  .nav-mc > ul {
    display: flex;                /* override DSes that set display:none at smaller widths */
    position: fixed;
    top: var(--mobile-drawer-top, 64px);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-pure, var(--bg, #fff));
    color: var(--ink, #111);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 16px 16px 32px;
    margin: 0;
    border-top: 1px solid var(--border, rgba(0, 0, 0, 0.1));
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: transform 240ms ease, opacity 200ms ease;
    z-index: 100;
    overflow-y: auto;
    list-style: none;
  }
  .nav > ul li,
  .nav-mc > ul li {
    width: 100%;
    border-bottom: 1px solid var(--border, rgba(0, 0, 0, 0.1));
    list-style: none;
    margin: 0;
  }
  .nav > ul li:last-child,
  .nav-mc > ul li:last-child { border-bottom: none; }
  .nav > ul a,
  .nav-mc > ul a {
    display: block;
    padding: 16px 4px;
    font-size: 16px;
    font-weight: 500;
    color: var(--ink, #111);
    text-decoration: none;
  }
  .nav > ul a::after,
  .nav-mc > ul a::after { display: none; }

  body.nav-open .nav > ul,
  body.nav-open .nav-mc > ul {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  /* ═══════════════════════════════════════════════════════════════════
     PATTERN B+C DRAWER — `.nav .nav-links`
     The link container is a div (B) or ul (C) holding links inline.
     We turn it into a fixed-position drawer at the same coordinates.
     Note: many Pattern B DSes ship a `.nav-links { display: none }` at
     ≤880px in their _shared.css — we override with `display: flex`.
     ═══════════════════════════════════════════════════════════════════ */
  /* `.nav .links` covers Pattern D (horizon-fix). `.nav-mc .nav-links`
     covers Pattern E (mc, which uses `.nav-mc` as the root class). */
  .nav .nav-links,
  .nav .links,
  .nav-mc .nav-links {
    display: flex;
    position: fixed;
    top: var(--mobile-drawer-top, 64px);
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;                   /* avoid 533px overflow on grid-item nav-links (centimark) */
    background: var(--bg-pure, var(--bg, #fff));
    color: var(--ink, #111);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;   /* override desktop `justify-content: flex-end` (centimark) */
    gap: 0;
    padding: 16px 16px 32px;
    margin: 0;
    border-top: 1px solid var(--border, rgba(0, 0, 0, 0.1));
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: transform 240ms ease, opacity 200ms ease;
    z-index: 100;
    overflow-y: auto;
    list-style: none;
  }
  /* Pattern B link items (direct `<a>` children of .nav-links).
     The `.nav.over-dark` and `.nav.over-photo` selectors are needed
     because those modifiers set `color: #fff` on .nav-links a in the
     desktop CSS — that would render links invisible against the
     drawer's light background without an override.
     `.nav .links > a` covers Pattern D (horizon-fix).
     `.nav-mc .nav-links > a` covers Pattern E (mc). */
  .nav .nav-links > a,
  .nav .links > a,
  .nav-mc .nav-links > a,
  .nav.over-dark .nav-links > a,
  .nav.over-photo .nav-links > a,
  .nav-mc.dark .nav-links > a {
    width: 100%;
    padding: 16px 4px;
    border-bottom: 1px solid var(--border, rgba(0, 0, 0, 0.1));
    font-size: 16px;
    font-weight: 500;
    color: var(--ink, #111);
    text-align: left;
    text-decoration: none;
    background: transparent;
  }
  /* Pattern C link items (`<li><a>` inside .nav-links ul) */
  .nav .nav-links > li,
  .nav.over-dark .nav-links > li,
  .nav.over-photo .nav-links > li {
    width: 100%;
    border-bottom: 1px solid var(--border, rgba(0, 0, 0, 0.1));
    list-style: none;
    margin: 0;
  }
  .nav .nav-links > li > a,
  .nav.over-dark .nav-links > li > a,
  .nav.over-photo .nav-links > li > a {
    display: block;
    padding: 16px 4px;
    font-size: 16px;
    font-weight: 500;
    color: var(--ink, #111);
    text-decoration: none;
  }
  .nav .nav-links > a:last-child,
  .nav .nav-links > li:last-child { border-bottom: none; }

  /* Suppress decorative ::before pseudos that DSes attach to nav links
     for desktop hover/active indicators (e.g. centimark's 20px brand-color
     circle above active link). They bleed into the mobile drawer as
     stray floating dots. */
  .nav .nav-links > a::before,
  .nav .nav-links > li > a::before,
  .nav .links > a::before,
  .nav-mc .nav-links > a::before {
    display: none !important;
  }

  /* The CTA-as-link inside .nav-links gets centered button styling */
  .nav .nav-links > a.nav-cta,
  .nav .nav-links > a.btn {
    margin-top: 16px;
    padding: 14px 24px;
    text-align: center;
    color: #fff;
    border-bottom: none;
    border-radius: var(--radius, 999px);
  }

  body.nav-open .nav .nav-links,
  body.nav-open .nav .links,
  body.nav-open .nav-mc .nav-links {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  /* ═══════════════════════════════════════════════════════════════════
     RIGHT-CTA SLOT (Pattern A — sits beside the burger on the bar)
     ═══════════════════════════════════════════════════════════════════ */
  .nav .right { gap: 8px; }
  .nav .right .btn,
  .nav .right .btn-sm { padding: 10px 14px; font-size: 12px; }

  /* Pattern D (horizon-fix): a stand-alone `.btn` lives directly inside
     `.nav .container` as a sibling of `.brand-mark` and `.links`. Tighten
     so it fits on the mobile bar beside the burger without clipping. */
  .nav > .container > .btn,
  .nav > .container > a.btn {
    padding: 8px 12px;
    font-size: 11px;
    flex-shrink: 0;
    white-space: nowrap;
  }

  /* ═══════════════════════════════════════════════════════════════════
     TYPE SCALE TIGHTENING
     ═══════════════════════════════════════════════════════════════════ */
  .display { font-size: clamp(40px, 11vw, 64px); line-height: 1.04; }
  .h1, h1  { font-size: clamp(34px, 9vw, 52px);  line-height: 1.06; }
  .h2, h2  { font-size: clamp(26px, 7vw, 38px);  line-height: 1.12; }
  .h3, h3  { font-size: clamp(20px, 5.4vw, 26px); }
  .h4, h4  { font-size: 18px; }
  .lede    { font-size: 15px; line-height: 1.6; }
  .lede-lg { font-size: 17px; line-height: 1.55; }

  /* ═══════════════════════════════════════════════════════════════════
     CONTAINERS — tighter side padding
     ═══════════════════════════════════════════════════════════════════ */
  .container,
  .container-narrow,
  .container-wide,
  .container-tight { padding-left: 16px; padding-right: 16px; }

  /* ═══════════════════════════════════════════════════════════════════
     GENERIC GRIDS — collapse multi-col to single col
     ═══════════════════════════════════════════════════════════════════ */
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .row-2col {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .row-2col.flip > .col-img { order: 0; }
  .row-2col .col-img { min-height: 240px; }

  /* ═══════════════════════════════════════════════════════════════════
     SECTION-HEAD — tighter bottom margin
     ═══════════════════════════════════════════════════════════════════ */
  .section-head { margin-bottom: 32px; }

  /* ═══════════════════════════════════════════════════════════════════
     HERO VARIANTS — drop the desktop min-height so content can flow
     ═══════════════════════════════════════════════════════════════════ */
  .hero-photo,
  .hero-centered,
  .hero-split,
  .hero-classic,
  .hero {
    min-height: auto;
    padding: 88px 16px 72px;
  }
  .hero-photo .container,
  .hero-centered .container,
  .hero-split .container,
  .hero .container { max-width: 100%; }
  .hero-photo h1,
  .hero-centered h1,
  .hero-split h1,
  .hero h1 {
    font-size: clamp(34px, 9vw, 52px);
    line-height: 1.05;
  }
  .hero-photo .lede,
  .hero-centered .lede,
  .hero-split .lede,
  .hero .lede {
    font-size: 15.5px;
    line-height: 1.55;
    margin-bottom: 24px;
  }
  .hero-photo .actions,
  .hero-centered .actions,
  .hero-split .actions,
  .hero .actions { gap: 10px; flex-wrap: wrap; }
  .hero-photo .actions .btn,
  .hero-centered .actions .btn,
  .hero-split .actions .btn,
  .hero .actions .btn { padding: 13px 22px; font-size: 14px; }

  /* ═══════════════════════════════════════════════════════════════════
     SOCIAL PROOF strip
     ═══════════════════════════════════════════════════════════════════ */
  .social-proof {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 18px 0;
  }
  .social-proof .divider { display: none; }
  .social-proof .item {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
  }

  /* ═══════════════════════════════════════════════════════════════════
     PROCESS STEPS, BEFORE-AFTER
     ═══════════════════════════════════════════════════════════════════ */
  .process-steps { grid-template-columns: 1fr; gap: 14px; }
  .before-after { grid-template-columns: 1fr; }
  .before-after .ba-divider { display: none; }
  .before-after .ba-half { aspect-ratio: 16/10; }

  /* ═══════════════════════════════════════════════════════════════════
     CTA BAND
     ═══════════════════════════════════════════════════════════════════ */
  .cta-band {
    padding: 56px 24px;
    text-align: center;
  }
  .cta-band h2 { font-size: clamp(26px, 7vw, 36px); }
  .cta-band .actions { flex-direction: column; align-items: stretch; }
  .cta-band .actions .btn { width: 100%; justify-content: center; }

  /* ═══════════════════════════════════════════════════════════════════
     FOOTER — collapse to single col, tighter padding
     ═══════════════════════════════════════════════════════════════════ */
  .footer { padding: 56px 16px 28px; }
  .footer .grid,
  .footer .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
    margin-bottom: 28px;
    padding-bottom: 24px;
  }
  .footer .legal,
  .footer-bottom {
    flex-direction: column;
    gap: 6px;
    align-items: flex-start;
  }

  /* ═══════════════════════════════════════════════════════════════════
     BUTTONS — slightly tighter on phones
     ═══════════════════════════════════════════════════════════════════ */
  .btn, .button { padding: 13px 24px; font-size: 14px; }
  .btn-lg { padding: 16px 28px; font-size: 15px; }

  /* ═══════════════════════════════════════════════════════════════════
     SX-SHELL (sections.html catalog) — stack index above main
     ═══════════════════════════════════════════════════════════════════ */
  .sx-header {
    padding: 14px 16px 12px;
    position: static;
  }
  .sx-header h1 { font-size: 18px; }
  .sx-header h1 small { display: block; margin: 4px 0 0; }
  .sx-header p { font-size: 13px; }
  .sx-body { grid-template-columns: 1fr; }
  .sx-index {
    position: static;
    margin: 16px;
    max-height: none;
    padding: 16px;
  }
  .sx-main { padding: 16px 16px 64px; }
  .sx-pattern { padding: 24px 18px 28px; }
  .sx-demo { padding: 20px; }

  /* ═══════════════════════════════════════════════════════════════════
     PAGES GALLERY (pages.html)
     ═══════════════════════════════════════════════════════════════════ */
  .pages-gallery { padding: 16px 16px 64px; }
  .pages-gallery .grid { gap: 20px; }

  /* ═══════════════════════════════════════════════════════════════════
     DS-NAV (catalog navigation in design-system.html)
     ═══════════════════════════════════════════════════════════════════ */
  .ds-nav { padding: 12px 16px; flex-wrap: wrap; }
  .ds-nav-tabs { font-size: 11px; gap: 12px; flex-wrap: wrap; }
  .ds-nav-inner { flex-wrap: wrap; gap: 10px; }
}