/* ===========================================================================
   IndustrieWert — base layer: reset, typography, primitives, motifs
   =========================================================================== */

@layer reset, type, motif, components, utility;

@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
  @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
  body { margin: 0; background: var(--c-surface); color: var(--c-ink);
         font-family: var(--f-sans); font-size: var(--fs-body);
         line-height: var(--lh-body); -webkit-font-smoothing: antialiased;
         text-rendering: optimizeLegibility; }
  img, svg, video { display: block; max-width: 100%; height: auto; }
  button, input, select, textarea { font: inherit; color: inherit; }
  a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 3px; }
  ul, ol { margin: 0; padding: 0; }
  h1, h2, h3, h4, p, figure { margin: 0; }
  table { border-collapse: collapse; }
  :where(a, button, input, select, textarea, [tabindex]):focus-visible {
    outline: var(--bw-emph) solid var(--c-focus);
    outline-offset: 3px;
    border-radius: var(--r-1);
  }
  ::selection { background: var(--c-accent); color: var(--c-accent-ink); }
  .visually-hidden {
    position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0;
    overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0;
  }
  .skip-link {
    position: absolute; left: var(--s-4); top: -100px; z-index: 200;
    background: var(--c-accent); color: var(--c-accent-ink);
    padding: var(--s-3) var(--s-4); font-weight: 600; transition: top var(--t-fast);
  }
  .skip-link:focus { top: var(--s-4); }
}

@layer type {
  .t-display {
    font-size: var(--fs-display); line-height: var(--lh-tight);
    letter-spacing: var(--ls-display); font-weight: 700; text-wrap: balance;
  }
  .t-h1 { font-size: var(--fs-h1); line-height: var(--lh-snug); letter-spacing: var(--ls-head); font-weight: 700; text-wrap: balance; }
  .t-h2 { font-size: var(--fs-h2); line-height: var(--lh-snug); letter-spacing: var(--ls-head); font-weight: 700; text-wrap: balance; }
  .t-h3 { font-size: var(--fs-h3); line-height: 1.3; letter-spacing: -0.01em; font-weight: 650; }
  .t-h4 { font-size: var(--fs-h4); line-height: 1.35; font-weight: 650; }
  .t-body-l { font-size: var(--fs-body-l); }
  .t-body-s { font-size: var(--fs-body-s); }
  .t-muted { color: var(--c-ink-muted); }
  .t-measure { max-width: var(--w-measure); }

  /* Label — the technical voice: spaced, upper, small. */
  .t-label {
    font-size: var(--fs-label); letter-spacing: var(--ls-label);
    text-transform: uppercase; font-weight: 600; color: var(--c-ink-muted);
  }

  /* Spec Value — tabular so counting never shifts width (directive §7.2). */
  .t-spec {
    font-family: var(--f-mono);
    font-variant-numeric: tabular-nums lining-nums;
    font-feature-settings: "tnum" 1, "lnum" 1;
    letter-spacing: -0.01em;
  }
  .t-caption { font-size: var(--fs-caption); color: var(--c-ink-faint); font-family: var(--f-mono); }
}

@layer motif {
  /* Technische Raster — 8px blueprint grid, 3–4% ink. Hero/section heads only. */
  .m-grid { position: relative; isolation: isolate; }
  .m-grid::before {
    content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
    background-image:
      linear-gradient(to right, rgb(13 13 13 / .035) 1px, transparent 1px),
      linear-gradient(to bottom, rgb(13 13 13 / .035) 1px, transparent 1px);
    background-size: 8px 8px;
    mask-image: linear-gradient(to bottom, #000 0%, #000 62%, transparent 100%);
  }
  .m-grid--deep::before {
    background-image:
      linear-gradient(to right, rgb(255 255 255 / .05) 1px, transparent 1px),
      linear-gradient(to bottom, rgb(255 255 255 / .05) 1px, transparent 1px);
  }

  /* Fadenkreuz — 12px crosshair corners on featured/active frames. */
  .m-cross { position: relative; }
  .m-cross::before, .m-cross::after {
    content: ""; position: absolute; width: 12px; height: 12px; pointer-events: none;
    border-color: var(--c-accent); border-style: solid; opacity: 0;
    transition: opacity var(--t-base) var(--ease-mech);
  }
  .m-cross::before { top: -1px; left: -1px; border-width: var(--bw-emph) 0 0 var(--bw-emph); }
  .m-cross::after { bottom: -1px; right: -1px; border-width: 0 var(--bw-emph) var(--bw-emph) 0; }
  .m-cross:hover::before, .m-cross:hover::after,
  .m-cross:focus-within::before, .m-cross:focus-within::after { opacity: 1; }

  /* Accent rule — the one place lime carries meaning on light ground. */
  .m-rule { display: block; width: 56px; height: var(--bw-emph); background: var(--c-accent); border: 0; }
}

@layer components {
  .wrap { width: 100%; max-width: var(--w-content); margin-inline: auto; padding-inline: var(--pad-gutter); }
  .wrap--wide { max-width: var(--w-wide); }
  .section { padding-block: var(--pad-section); }
  .section--alt { background: var(--c-surface-alt); }
  .section--deep { background: var(--c-surface-deep); color: #fff; }
  .section--deep .t-muted { color: var(--c-grey-400); }
  .section--deep .t-label { color: var(--c-accent); }

  .section-head { display: flex; flex-direction: column; gap: var(--s-3); margin-bottom: var(--s-7); }
  .section-head__meta { display: flex; align-items: center; gap: var(--s-3); }
  /* Anchor variants: the reading position moves act to act (lead / centre / trail). */
  .section-head--centre { align-items: center; text-align: center; }
  .section-head--trail  { align-items: flex-end; text-align: right; margin-left: auto; max-width: 30ch; }

  /* --- Buttons ----------------------------------------------------------- */
  .btn {
    --btn-bg: var(--c-industrial-900); --btn-ink: #fff; --btn-bd: var(--c-industrial-900);
    display: inline-flex; align-items: center; justify-content: center; gap: var(--s-2);
    padding: 14px var(--s-5); min-height: 48px;
    background: var(--btn-bg); color: var(--btn-ink);
    border: var(--bw-hair) solid var(--btn-bd); border-radius: var(--r-1);
    font-weight: 600; font-size: var(--fs-body-s); letter-spacing: 0.01em;
    text-decoration: none; cursor: pointer; white-space: nowrap;
    transition: background var(--t-fast) var(--ease-mech), color var(--t-fast) var(--ease-mech),
                border-color var(--t-fast) var(--ease-mech), transform var(--t-fast) var(--ease-mech);
  }
  .btn:hover { --btn-bg: var(--c-industrial-700); --btn-bd: var(--c-industrial-700); }
  .btn:active { transform: translateY(1px); }
  .btn--accent { --btn-bg: var(--c-accent); --btn-ink: var(--c-accent-ink); --btn-bd: var(--c-accent); }
  .btn--accent:hover { --btn-bg: var(--c-accent-dim); --btn-bd: var(--c-accent-dim); }
  .btn--ghost { --btn-bg: transparent; --btn-ink: var(--c-ink); --btn-bd: var(--c-grey-400); }
  .btn--ghost:hover { --btn-bg: transparent; --btn-ink: var(--c-ink); --btn-bd: var(--c-industrial-900); }
  .section--deep .btn--ghost { --btn-ink: #fff; --btn-bd: rgb(255 255 255 / .38); }
  .section--deep .btn--ghost:hover { --btn-ink: var(--c-accent); --btn-bd: var(--c-accent); }

  /* --- Product card ------------------------------------------------------ */
  .card {
    display: flex; flex-direction: column; background: var(--c-surface);
    border: var(--bw-hair) solid var(--c-rule); border-radius: var(--r-1);
    overflow: hidden; height: 100%; position: relative;
    transition: border-color var(--t-base) var(--ease-mech), transform var(--t-base) var(--ease-mech), box-shadow var(--t-base) var(--ease-mech);
  }
  /* lime rule slides in along the top edge on hover — the brand's one colour, used as a signal */
  .card::after { content: ""; position: absolute; left: 0; top: 0; height: 3px; width: 100%; background: var(--c-accent);
                 transform: scaleX(0); transform-origin: left; transition: transform var(--t-base) var(--ease-mech); z-index: 2; }
  .card:hover { border-color: var(--c-industrial-900); transform: translateY(-2px); box-shadow: 0 10px 28px rgb(0 0 0 / .08); }
  .card:hover::after { transform: scaleX(1); }
  @media (prefers-reduced-motion: reduce) { .card:hover { transform: none; } }
  .card__media { position: relative; aspect-ratio: 4 / 3; background: var(--c-surface-alt); overflow: hidden; }
  .card__media img { width: 100%; height: 100%; object-fit: cover;
    transition: transform var(--t-slow) var(--ease-mech); }
  .card:hover .card__media img { transform: scale(1.03); }
  .card__flag {
    position: absolute; top: var(--s-3); left: var(--s-3); z-index: 1;
    background: var(--c-accent); color: var(--c-accent-ink);
    padding: 3px var(--s-2); font-size: var(--fs-caption); font-weight: 700;
    letter-spacing: 0.06em; text-transform: uppercase;
  }
  .card__body { display: flex; flex-direction: column; gap: var(--s-2); padding: var(--s-4); flex: 1; }
  .card__family { font-size: var(--fs-caption); letter-spacing: var(--ls-label);
    text-transform: uppercase; color: var(--c-ink-faint); font-weight: 600; }
  .card__title { font-size: var(--fs-body); font-weight: 650; line-height: 1.34; }
  .card__title a { text-decoration: none; }
  .card__title a::after { content: ""; position: absolute; inset: 0; }
  .card__spec { display: flex; gap: var(--s-2); flex-wrap: wrap; margin-top: auto; padding-top: var(--s-3); }
  .card__chip {
    font-family: var(--f-mono); font-size: var(--fs-caption);
    border: var(--bw-hair) solid var(--c-rule); padding: 2px var(--s-2);
    color: var(--c-ink-muted); border-radius: var(--r-1);
  }
  .card__foot {
    display: flex; align-items: baseline; justify-content: space-between; gap: var(--s-3);
    padding: var(--s-3) var(--s-4); border-top: var(--bw-hair) solid var(--c-grey-100);
  }
  .price { font-family: var(--f-mono); font-variant-numeric: tabular-nums lining-nums;
           font-weight: 600; font-size: var(--fs-body-l); }
  .price__was { font-size: var(--fs-body-s); color: var(--c-ink-faint);
                text-decoration: line-through; font-weight: 400; margin-right: var(--s-2); }
  .price__note { font-size: var(--fs-caption); color: var(--c-ink-faint); font-family: var(--f-sans); }
  .price--ask { font-family: var(--f-sans); font-size: var(--fs-body-s); font-weight: 600; }

  .grid-cards {
    display: grid; gap: var(--gutter);
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 264px), 1fr));
  }
}

@layer utility {
  .stack { display: flex; flex-direction: column; }
  .stack > * + * { margin-top: var(--gap, var(--s-4)); }
  .row { display: flex; align-items: center; gap: var(--s-3); flex-wrap: wrap; }
  .relative { position: relative; }

  /* Reveal primitive — mask + 12px lift, staggered.
     Content is VISIBLE by default and only hidden once JS has confirmed it can
     reveal it again (html.js-motion). A CSP block, a failed module fetch or a
     JS error therefore degrades to a plain readable page instead of a blank
     one — the failure mode that matters most here. */
  .reveal { opacity: 1; transform: none; }

  .js-motion .reveal { opacity: 0; transform: translateY(12px); }
  .js-motion .reveal.is-in {
    opacity: 1; transform: none;
    transition: opacity var(--t-reveal) var(--ease-mech),
                transform var(--t-reveal) var(--ease-mech);
    transition-delay: var(--reveal-delay, 0ms);
  }
  @media (prefers-reduced-motion: reduce) {
    .js-motion .reveal { opacity: 1; transform: none; }
  }
}