/* gallery/css/gallery.css  [WP5]
 * Das Fotoarchiv as a contact sheet. JS-free page, always dark (html.screen, tokens from
 * ../css/tokens.css). Justified rows without JS: every frame grows by its aspect ratio (--ar).
 */
@layer reset {
  *,
  *::before,
  *::after {
    box-sizing: border-box;
  }
  html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
  }
  body,
  h1,
  h2,
  p,
  ol,
  figure {
    margin: 0;
  }
  img {
    display: block;
    max-inline-size: 100%;
  }
}

@layer base {
  html {
    background: var(--bg);
    color: var(--ink);
    font-family: var(--font-body);
    font-weight: 420;
    line-height: 1.6;
    scroll-padding-top: 24px;
    -webkit-font-smoothing: antialiased;
  }
  body {
    min-block-size: 100svh;
    padding-inline: max(16px, 4vw);
    background:
      radial-gradient(90% 40% at 50% 0%, color-mix(in srgb, var(--heat-1) 35%, transparent), transparent 70%),
      var(--bg);
  }
  a {
    color: var(--accent);
    text-underline-offset: 0.2em;
  }
  :focus-visible {
    outline: 3px solid var(--focus);
    outline-offset: 2px;
  }
  .vh {
    position: absolute !important;
    inline-size: 1px !important;
    block-size: 1px !important;
    overflow: hidden !important;
    clip-path: inset(50%) !important;
    white-space: nowrap !important;
  }
  .skip-link {
    position: absolute;
    inset: 8px auto auto 8px;
    z-index: 10;
    padding: 10px 14px;
    background: var(--ink);
    color: var(--bg);
    transform: translateY(-200%);
  }
  .skip-link:focus {
    transform: none;
  }

  /* Header */
  .g-header {
    max-inline-size: 1440px;
    margin-inline: auto;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding-block: 16px;
    border-block-end: 1px solid var(--line);
  }
  .g-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-block-size: 44px;
    color: var(--ink);
    text-decoration: none;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    line-height: 1.1;
  }
  .g-brand img {
    inline-size: 54px;
    block-size: auto;
    filter: brightness(1.2);
  }
  .g-back {
    display: inline-flex;
    align-items: center;
    min-block-size: 44px;
    color: var(--ink);
    font-weight: 650;
    text-decoration-color: var(--accent);
    text-decoration-thickness: 2px;
  }

  main {
    max-inline-size: 1440px;
    margin-inline: auto;
  }
  .g-intro {
    display: grid;
    gap: 20px;
    padding-block: clamp(56px, 9vw, 140px) clamp(32px, 5vw, 64px);
  }
  .g-eyebrow,
  .night-meta,
  .g-note,
  .index-no,
  .frame-time,
  .frame-edge {
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
  }
  .g-eyebrow {
    font-size: 0.8125rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--muted);
  }
  h1 {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(3.4rem, 1.4rem + 9vw, 10rem);
    line-height: 0.86;
    letter-spacing: -0.025em;
  }
  .g-lead {
    max-inline-size: 38ch;
    font-size: clamp(1.125rem, 1rem + 0.5vw, 1.375rem);
    line-height: 1.45;
  }
  .g-note {
    max-inline-size: 64ch;
    font-size: 0.8125rem;
    color: var(--muted);
  }

  /* Night index */
  .g-index {
    position: sticky;
    top: 0;
    z-index: 5;
    margin-block-end: 24px;
    padding-block: 8px;
    /* opaque: nothing of the previous night may show through or peek around it */
    background: var(--bg);
    border-block: 1px solid var(--line);
    box-shadow: 0 10px 12px -10px color-mix(in srgb, var(--bg) 80%, black);
    overflow-x: auto;
  }
  .g-index ol {
    display: flex;
    gap: 2px;
    padding: 0;
    list-style: none;
  }
  .g-index a {
    display: inline-flex;
    align-items: baseline;
    gap: 6px;
    min-block-size: 44px;
    align-items: center;
    padding-inline: 10px;
    white-space: nowrap;
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    text-decoration: none;
    border: 1px solid transparent;
  }
  .g-index a:hover,
  .g-index a:focus-visible {
    color: var(--ink);
    border-color: var(--control);
  }
  .index-no {
    color: var(--heat-text);
  }

  /* Nights */
  .night {
    display: grid;
    gap: 16px;
    padding-block: 40px;
    border-block-start: 1px solid var(--line);
    scroll-margin-top: 80px;
  }
  .night-head {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    justify-content: space-between;
    gap: 8px 24px;
  }
  h2 {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(1.75rem, 1.2rem + 2vw, 3rem);
    line-height: 1;
    letter-spacing: -0.015em;
  }
  .night-meta {
    font-size: 0.8125rem;
    color: var(--muted);
  }

  /* Contact sheet: justified rows by aspect ratio */
  .photo-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
  }
  .photo-grid::after {
    content: "";
    flex-grow: 999;
  }
  .frame {
    --heat: 0;
    position: relative;
    flex: var(--ar) 1 calc(var(--ar) * clamp(130px, 15vw, 210px));
    display: grid;
    gap: 6px;
    min-inline-size: 0;
    color: var(--ink);
    text-decoration: none;
    scroll-margin-top: 96px;
  }
  .frame img {
    inline-size: 100%;
    block-size: auto;
    aspect-ratio: var(--ar);
    object-fit: cover;
    background: var(--surface-2);
    filter: brightness(calc(0.9 + var(--heat) * 0.14));
  }
  .frame-edge {
    position: absolute;
    inset: 6px auto auto 6px;
    padding: 1px 5px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--heat-text);
    background: color-mix(in srgb, var(--bg) 70%, transparent);
  }
  .frame-time {
    font-size: 0.8125rem;
    color: var(--muted);
  }
  .frame:hover,
  .frame:focus-visible {
    --heat: 1;
  }
  .frame:hover .frame-time,
  .frame:focus-visible .frame-time {
    color: var(--heat-text);
  }
  .frame:target img {
    outline: 3px solid var(--heat-4);
    outline-offset: 3px;
  }
  .frame:target .frame-edge {
    background: var(--heat-4);
    color: var(--bg);
  }

  .g-footer {
    max-inline-size: 1440px;
    margin-inline: auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 16px;
    padding-block: 40px max(40px, env(safe-area-inset-bottom));
    border-block-start: 1px solid var(--line);
    color: var(--muted);
    font-size: 0.9375rem;
  }
  .g-footer a {
    color: var(--ink);
    font-weight: 650;
    min-block-size: 44px;
    display: inline-flex;
    align-items: center;
  }

  @media (max-width: 480px) {
    .frame {
      flex-basis: calc(var(--ar) * 130px);
    }
  }

  @media (prefers-reduced-motion: no-preference) {
    html {
      scroll-behavior: smooth;
    }
    .frame img {
      transition: filter var(--d-cool) var(--ease-cool);
    }
    .frame:is(:hover, :focus-visible) img {
      transition-duration: var(--d-heat-in);
    }
  }
  @media (forced-colors: active) {
    .frame:target img {
      outline-color: Highlight;
    }
  }
}