:root {
    --ink: hsl(220, 49%, 8%);
    --graphite: hsl(218, 12%, 40%);
    --faint: hsl(218, 12%, 62%);
    --cobalt: hsl(216, 89%, 43%);
    --cobalt-deep: hsl(217, 89%, 37%);
    --cool: hsl(220, 14%, 96%);
    --border: hsl(220, 30%, 92%);
    --success: #177A53;
    --success-bg: rgba(31,157,107,0.12);
    --sans: "DM Sans", system-ui, sans-serif;
    --display: "Geist", system-ui, sans-serif;
  }
  * { margin: 0; padding: 0; box-sizing: border-box; }
  body {
    background: #fff; color: var(--ink);
    font-family: var(--sans); font-feature-settings: 'ss01';
    font-size: 15.5px; line-height: 1.6;
    -webkit-font-smoothing: antialiased;
  }
  .wrap { max-width: 1180px; margin: 0 auto; padding: 0 32px; }
  .label { font-size: 11.5px; line-height: 15px; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; color: var(--graphite); }
  .label.blue { color: var(--cobalt); }
  h1, h2 { font-family: var(--display); font-weight: 500; letter-spacing: -0.02em; text-wrap: balance; }
  header.site {
    border-bottom: 1px solid var(--border);
    padding: 15px 0;
    position: sticky; top: 0; background: rgba(255,255,255,0.92);
    backdrop-filter: blur(10px); z-index: 40;
  }
  header.site .row { display: flex; align-items: center; gap: 16px; }
  header.site svg { height: 26px; width: 116.8px; display: block; }
  header.site .tag { color: var(--faint); font-size: 13.5px; border-left: 1px solid var(--border); padding-left: 16px; }
  header.site .spacer { flex: 1; }
  header.site a.back { color: var(--graphite); font-size: 14px; font-weight: 500; text-decoration: none; }
  header.site a.back:hover { color: var(--ink); }

  .hero { padding: 64px 0 8px; }
  .hero h1 { font-size: clamp(1.9rem, 3.4vw, 2.6rem); margin-top: 14px; max-width: 620px; }
  .hero p.sub { margin-top: 12px; color: var(--graphite); max-width: 560px; }

  .sect { padding: 56px 0 16px; }
  .sect-head { display: flex; align-items: baseline; justify-content: space-between; gap: 24px; border-bottom: 1px solid var(--border); padding-bottom: 12px; }
  .sect-head .hint { color: var(--faint); font-size: 13.5px; }

  .grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 28px; }
  a.pcard {
    display: block; text-decoration: none; color: var(--ink);
    border: 1px solid var(--border); border-radius: 10px; overflow: hidden;
    transition: border-color 0.2s;
    background: #fff;
  }
  a.pcard:hover { border-color: var(--graphite); }
  a.pcard .thumb { aspect-ratio: 16/10; overflow: hidden; border-bottom: 1px solid var(--border); background: var(--cool); position: relative; }
  a.pcard .thumb img { width: 100%; height: 100%; object-fit: cover; object-position: top; display: block; }
  a.pcard .body { padding: 14px 16px 16px; }
  a.pcard .t { display: flex; align-items: center; gap: 8px; font-weight: 500; font-size: 15.5px; }
  a.pcard .b { margin-top: 4px; color: var(--graphite); font-size: 13.5px; }
  .chip { display: inline-flex; align-items: center; border-radius: 999px; padding: 1px 9px; font-size: 11.5px; font-weight: 500; }
  .chip.new { background: var(--success-bg); color: var(--success); }
  .chip.n { background: var(--cool); color: var(--graphite); }

  /* detail page */
  .detail-head { padding: 48px 0 0; display: grid; grid-template-columns: 1.15fr 1fr; column-gap: 72px; align-items: end; }
  .detail-head .label { grid-column: 1 / -1; }
  .detail-head h1 { grid-column: 1; font-size: clamp(1.8rem, 3vw, 2.4rem); margin-top: 12px; }
  .detail-head .blurb { grid-column: 2; color: var(--graphite); padding-bottom: 4px; }
  ul.changes { list-style: none; margin: 26px 0 0; max-width: 860px; }
  ul.changes li { padding: 9px 0 9px 22px; border-top: 1px solid var(--border); color: var(--graphite); font-size: 14px; position: relative; }
  ul.changes li::before { content: ""; position: absolute; left: 2px; top: 17px; width: 6px; height: 6px; border-radius: 50%; background: var(--cobalt); }

  .viewer { margin-top: 36px; }
  .viewer .bar { display: flex; align-items: center; gap: 14px; margin-bottom: 12px; }
  .seg { display: inline-flex; border: 1px solid var(--border); border-radius: 999px; padding: 3px; }
  .seg button {
    border: 0; background: transparent; cursor: pointer;
    font-family: var(--sans); font-size: 13px; font-weight: 500; color: var(--graphite);
    border-radius: 999px; padding: 6px 16px;
  }
  .seg button.on { background: var(--ink); color: #fff; }
  .compare { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
  .pane { border: 1px solid var(--border); border-radius: 10px; overflow: hidden; background: var(--cool); }
  .pane .cap { display: flex; justify-content: space-between; padding: 9px 14px; border-bottom: 1px solid var(--border); background: #fff; }
  .pane .imgbox { max-height: 72vh; overflow-y: auto; }
  .pane img { width: 100%; display: block; }
  .pane .missing { padding: 64px 24px; text-align: center; color: var(--faint); font-size: 14px; }
  .viewer.single .compare { grid-template-columns: 1fr; }
  .viewer.single .pane.off { display: none; }
  .viewer.single .pane .imgbox { max-height: none; }

  /* comments */
  .comments { margin: 56px 0 0; max-width: 760px; }
  .comments h2 { font-size: 19px; }
  .clist { margin-top: 18px; border-top: 1px solid var(--border); }
  .citem { padding: 14px 2px; border-bottom: 1px solid var(--border); }
  .citem .who { display: flex; gap: 10px; align-items: baseline; }
  .citem .who b { font-weight: 500; font-size: 14px; }
  .citem .who span { color: var(--faint); font-size: 12px; }
  .citem p { margin-top: 4px; color: var(--graphite); font-size: 14.5px; white-space: pre-wrap; }
  .cempty { padding: 18px 2px; color: var(--faint); font-size: 14px; border-bottom: 1px solid var(--border); }
  form.cform { margin-top: 18px; display: grid; gap: 10px; }
  form.cform input, form.cform textarea {
    font-family: var(--sans); font-size: 14.5px; color: var(--ink);
    border: 1px solid var(--border); border-radius: 8px; padding: 9px 12px;
    background: #fff; width: 100%;
  }
  form.cform textarea { min-height: 88px; resize: vertical; }
  form.cform input:focus, form.cform textarea:focus { outline: 2px solid hsla(216,89%,43%,0.35); border-color: var(--cobalt); }
  form.cform .frow { display: flex; gap: 10px; align-items: center; }
  form.cform input.name { max-width: 220px; }
  form.cform button {
    border: 0; cursor: pointer; font-family: var(--sans); font-size: 14px; font-weight: 500;
    background: var(--cobalt); color: #fff; border-radius: 999px; padding: 9px 20px;
  }
  form.cform button:hover { background: var(--cobalt-deep); }
  form.cform .status { color: var(--faint); font-size: 13px; }

  footer.site { margin-top: 88px; border-top: 1px solid var(--border); padding: 28px 0 40px; color: var(--faint); font-size: 13px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

  /* gate */
  #gate {
    position: fixed; inset: 0; z-index: 100; background: #fff;
    display: grid; place-items: center;
  }
  #gate .box { width: min(360px, 90vw); }
  #gate h1 { font-size: 22px; margin-top: 14px; }
  #gate p { color: var(--graphite); font-size: 14px; margin-top: 6px; }
  #gate form { margin-top: 18px; display: flex; gap: 8px; }
  #gate input { flex: 1; font-family: var(--sans); font-size: 14.5px; border: 1px solid var(--border); border-radius: 999px; padding: 9px 16px; }
  #gate button { border: 0; cursor: pointer; font-family: var(--sans); font-size: 14px; font-weight: 500; background: var(--ink); color: #fff; border-radius: 999px; padding: 9px 18px; }
  #gate .err { color: #C0392B; font-size: 13px; margin-top: 10px; min-height: 18px; }

  @media (max-width: 900px) {
    .wrap { padding: 0 20px; }
    .grid { grid-template-columns: 1fr; }
    .detail-head { grid-template-columns: 1fr; }
    .detail-head .blurb { grid-column: 1; margin-top: 10px; }
    .compare { grid-template-columns: 1fr; }
  }