/* ═══════════════════════════════════════════════════════════════════
   COLLECTION PAGE AI OPTIMIZATION

   Loads on top of product-opt.css, which already carries the shared mock
   chrome: .po-sec, .po-two, .po-copy, .po-num, .po-do, .mk, .pox-row,
   .mk-tag, .mk-note, .mk-title, .mk-legend, .mk-ruler, .code, the .t-*
   title legend and the .wch watch. Only what is new to this page is here,
   so the two deep dives cannot drift apart visually.
   ═══════════════════════════════════════════════════════════════════ */

/* Width helpers for the skeleton text inside mocks. */
.w50{width:50%}.w60{width:60%}.w70{width:70%}.w80{width:80%}
.w85{width:85%}.w90{width:90%}.w95{width:95%}

.mk-tag.good-tag{background:#E6F7F0;color:#0E7A5B;border:1px solid #C6EBDC}

/* The hero H1 wraps naturally here rather than forcing a break, because the
   line is a sentence rather than a two-part headline. */
.co-hero .po-h1 .grad-text{display:inline;margin-top:0}

/* ══════════ HERO: THE ANNOTATED PAGE ══════════ */
.ca-frame{
  background:#fff;border-radius:16px;overflow:hidden;
  box-shadow:0 30px 80px rgba(7,9,18,.5),0 3px 10px rgba(7,9,18,.3);
  border:1px solid rgba(255,255,255,.1);
}
.ca-bar{
  display:flex;align-items:center;gap:6px;padding:9px 12px;
  background:var(--paper-2);border-bottom:1px solid var(--line-2);
}
.ca-bar i{width:8px;height:8px;border-radius:50%;background:#D7DCE8;flex:none}
.ca-bar span{
  margin-left:8px;font-size:10.5px;color:var(--ink-3);
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.ca-page{padding:14px 14px 16px;display:flex;flex-direction:column;gap:10px}

/* The number lives in a reserved gutter column. Absolutely positioned pins
   have to be re-placed at every breakpoint and drift when a row changes
   height; a grid column cannot come apart. */
.ca-row{display:grid;grid-template-columns:26px minmax(0,1fr);gap:10px;align-items:start}
.ca-n{
  font-family:'IBM Plex Mono',monospace;font-size:10px;font-weight:600;
  color:var(--violet);background:rgba(124,108,255,.1);
  border:1px solid rgba(124,108,255,.24);border-radius:6px;
  height:20px;display:grid;place-items:center;
}
.ca-n-ghost{background:none;border-color:transparent}

.ca-crumb{font-size:10px;color:var(--ink-3)}
.ca-crumb b{color:var(--ink-2);font-weight:600}
.ca-h1{font-size:18px;font-weight:700;letter-spacing:-.02em;color:var(--ink)}
.ca-intro{font-size:11.5px;line-height:1.5;color:var(--ink-2);margin:0}

.ca-facets{display:flex;gap:6px;flex-wrap:wrap}
.ca-chip{
  font-size:10px;padding:4px 9px;border-radius:99px;
  border:1px solid var(--line);color:var(--ink-3);background:#fff;white-space:nowrap;
}
.ca-chip b{font-weight:600;color:var(--ink-2)}
.ca-chip.on{background:rgba(124,108,255,.1);border-color:rgba(124,108,255,.3);color:var(--violet)}
.ca-chip.on b{color:var(--violet)}

.ca-sort{font-size:10px;color:var(--ink-3)}
.ca-sort b{color:var(--ink-2);font-weight:600}

.ca-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.ca-card{
  background:var(--paper-2);border:1px solid var(--line-2);border-radius:9px;
  padding:8px 6px 6px;display:flex;flex-direction:column;align-items:center;gap:5px;
}
.ca-shot{height:52px;display:grid;place-items:center;transform:scale(.42);transform-origin:center}
.ca-attr{font-size:10px;color:var(--ink-3)}

.ca-block{
  background:var(--paper-2);border:1px solid var(--line-2);border-radius:9px;padding:9px 11px;
}
.ca-block b{display:block;font-size:11px;font-weight:600;color:var(--ink);margin-bottom:6px}
.ca-block u{display:block;height:4px;border-radius:2px;background:#E1E6F0;margin-bottom:4px;text-decoration:none}
.ca-tt{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:5px;margin-bottom:4px}
.ca-tt span{height:5px;border-radius:2px;background:#E1E6F0}
.ca-table-mini .ca-tt:first-of-type span{background:#CFD6E6}

.ca-schema{
  font-size:10.5px;color:var(--violet);background:rgba(124,108,255,.07);
  border:1px dashed rgba(124,108,255,.3);border-radius:8px;padding:7px 10px;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}

.ca-foot{
  display:flex;align-items:center;gap:10px;
  padding:11px 14px;background:var(--night-2);
  border-top:1px solid rgba(255,255,255,.08);
}
.ca-foot span:last-child{font-size:11px;line-height:1.45;color:var(--night-ink-2)}
.ca-n-solo{
  flex:none;width:26px;height:20px;
  background:rgba(124,108,255,.18);border-color:rgba(124,108,255,.4);color:var(--violet-2);
}

/* ══════════ WHERE THE DEMAND IS ══════════ */
.co-demand{
  max-width:820px;margin:0 auto;background:#fff;border:1px solid var(--line-2);
  border-radius:var(--r-lg);padding:clamp(20px,3vw,30px);box-shadow:var(--shadow-sm);
}
.cd-head{display:flex;justify-content:space-between;align-items:baseline;gap:16px;flex-wrap:wrap;margin-bottom:18px}
.cd-lab{font-size:14px;font-weight:600;letter-spacing:-.01em}
.cd-key{display:flex;align-items:center;gap:7px;font-size:11px;color:var(--ink-3);flex-wrap:wrap}
.cd-i{width:9px;height:9px;border-radius:3px;display:inline-block}
.cd-i.cat{background:var(--violet)}
.cd-i.prod{background:#C9D0E0;margin-left:8px}

.cd-bars{list-style:none;display:flex;flex-direction:column;gap:11px}
.cd-bar{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:14px;align-items:center}
.cd-q{font-size:13.5px;color:var(--ink-2);min-width:0}
.cd-bar.product .cd-q{color:var(--ink-3)}
.cd-track{height:10px;border-radius:99px;background:var(--paper-3);overflow:hidden}
.cd-track u{display:block;height:100%;border-radius:99px;text-decoration:none;background:var(--grad)}
.cd-bar.product .cd-track u{background:#C9D0E0}
.cd-note{margin-top:18px;padding-top:14px;border-top:1px solid var(--line-2);font-size:12.5px;color:var(--ink-3);line-height:1.6}

/* ══════════ THE PROBLEM: FOUR STEPS ══════════ */
.co-flow4{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  align-items:stretch;gap:0;
}
.cf-arrow{display:none}
.co-flow4{gap:14px}
.cf-step{
  background:#fff;border:1px solid var(--line-2);border-radius:var(--r);
  padding:16px 15px 15px;display:flex;flex-direction:column;gap:9px;min-width:0;
}
.cf-step-bad{border-color:rgba(255,92,138,.3);background:#FFF8FA}
.cf-n{
  width:22px;height:22px;border-radius:7px;display:grid;place-items:center;
  font-size:11px;font-weight:600;color:var(--violet);
  background:rgba(124,108,255,.1);border:1px solid rgba(124,108,255,.22);
}
.cf-step-bad .cf-n{color:#C2453F;background:#FFE9EF;border-color:#FFD2DE}
.cf-step b{font-size:14px;letter-spacing:-.01em}
.cf-step p{font-size:12.5px;line-height:1.55;color:var(--ink-3);margin:0}

.cf-vis{
  background:var(--paper-2);border:1px solid var(--line-2);border-radius:9px;
  padding:10px;min-height:74px;display:grid;place-items:center;
}
.cf-grid-vis{grid-template-columns:repeat(3,1fr);gap:4px;place-items:stretch}
.cf-grid-vis i{background:#E1E6F0;border-radius:3px;aspect-ratio:1}
.cf-think span{font-size:12px;color:var(--ink-2);text-align:center;line-height:1.4}
.cf-ask{background:var(--night-2);border-color:transparent}
.cf-ask span{font-size:10.5px;color:var(--cyan);text-align:center;line-height:1.4}
.cf-answer{align-content:center;justify-items:stretch;gap:5px;background:#fff}
.cf-cite{font-size:11px;font-weight:600;color:#C2453F;font-family:'IBM Plex Mono',monospace}
.cf-answer u{display:block;height:4px;border-radius:2px;background:#E1E6F0;text-decoration:none}

/* ══════════ 01 · THE MAP ══════════ */
.co-tree{list-style:none;font-size:13px;line-height:1.7}
.co-tree.flat li{
  color:var(--ink-3);padding:3px 0 3px 14px;position:relative;
}
.co-tree.flat li::before{
  content:'';position:absolute;left:0;top:12px;width:6px;height:1px;background:#C9D0E0;
}
.co-tree ul{list-style:none;margin-left:16px;border-left:1px dashed var(--line);padding-left:12px}
.co-tree .l1{font-weight:600;color:var(--ink)}
.co-tree .l2{font-weight:600;color:var(--ink-2);padding-top:4px}
.co-tree .l3{color:var(--ink-3);font-size:12.5px}

.co-aside{
  margin-top:14px;padding-top:12px;border-top:1px dashed var(--line);
  display:flex;align-items:center;gap:7px;flex-wrap:wrap;
}
.co-aside-lab{font-size:10px;color:var(--ink-3);letter-spacing:.06em;text-transform:uppercase}
.co-pill{
  font-size:11px;padding:3px 9px;border-radius:99px;
  background:var(--paper-3);color:var(--ink-3);border:1px solid var(--line-2);
}

/* ══════════ 02 · H1 AND TITLE ══════════ */
.co-tt{display:grid;grid-template-columns:44px minmax(0,1fr);gap:10px;align-items:baseline;margin-bottom:10px}
.co-tt-lab{font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3)}
.mk-title.dim{color:var(--ink-3);font-weight:500}

/* ══════════ 03 · THE INTRO ══════════ */
.co-phones .pox-row{display:flex;flex-direction:column}
.co-phone{
  border:1px solid var(--line);border-radius:12px;padding:10px;background:var(--paper-2);
  max-width:210px;margin:0 auto;
}
.co-ph-h1{font-size:13px;font-weight:700;letter-spacing:-.02em;margin-bottom:7px}
.co-ph-text u{display:block;height:4px;border-radius:2px;background:#DDE3EF;margin-bottom:4px;text-decoration:none}
.co-ph-text.short u{background:#C6CEDE}
.co-ph-fold{
  margin:8px -10px;border-top:1px dashed #C2453F;position:relative;height:0;
}
.co-ph-fold span{
  position:absolute;right:10px;top:-7px;font-size:10px;color:#C2453F;
  background:var(--paper-2);padding:0 5px;
}
.co-ph-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:6px;margin-top:8px}
.co-ph-grid i{background:#E1E6F0;border-radius:5px;aspect-ratio:1}
.co-ph-guide{
  margin-top:8px;border-radius:6px;padding:7px 8px;
  background:rgba(18,169,122,.09);border:1px solid rgba(18,169,122,.24);
}
.co-ph-guide span{font-size:10.5px;color:#0E7A5B}

/* ══════════ 04 · THE BUYING GUIDE ══════════ */
.co-guide-mk{
  background:#fff;border:1px solid rgba(18,169,122,.28);border-radius:var(--r);
  padding:clamp(16px,2.2vw,22px);box-shadow:0 14px 40px rgba(18,169,122,.08);
}
.co-gd-head{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:16px}
.co-gd-head b{font-size:16px;letter-spacing:-.01em}
.co-gd{list-style:none;display:flex;flex-direction:column;gap:13px}
.co-gd li{display:grid;grid-template-columns:28px minmax(0,1fr);gap:11px;align-items:start}
.co-gd-n{
  font-size:10px;font-weight:600;color:var(--violet);
  background:rgba(124,108,255,.09);border:1px solid rgba(124,108,255,.2);
  border-radius:6px;height:20px;display:grid;place-items:center;
}
.co-gd b{display:block;font-size:14px;font-weight:600;letter-spacing:-.01em;margin-bottom:2px}
.co-gd span{font-size:13px;line-height:1.55;color:var(--ink-2)}
.co-gd-avoid .co-gd-n{color:#C2453F;background:#FFE9EF;border-color:#FFD2DE}
.co-gd-foot{margin-top:16px;padding-top:13px;border-top:1px solid var(--line-2)}
.co-lift{font-size:12.5px;line-height:1.55;color:#0E7A5B}

/* ══════════ 05 · THE COMPARISON TABLE ══════════ */
.co-cmp-mk{gap:0}
/* Its own scroller: a four-column table cannot shrink below its content, and
   the page must never scroll sideways because of it. */
.co-cmp-wrap{
  overflow-x:auto;-webkit-overflow-scrolling:touch;
  border:1px solid var(--line-2);border-radius:var(--r);background:#fff;
}
.co-cmp{border-collapse:collapse;width:100%;min-width:420px;font-size:13px}
.co-cmp th,.co-cmp td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line-2)}
.co-cmp thead th{
  font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3);
  font-weight:600;background:var(--paper-2);white-space:nowrap;
}
.co-cmp tbody th{font-weight:600;color:var(--ink)}
.co-cmp td{color:var(--ink-2);font-family:'IBM Plex Mono',monospace;font-size:12px;white-space:nowrap}
.co-cmp tbody tr:last-child th,.co-cmp tbody tr:last-child td{border-bottom:0}

.co-lifted{
  margin-top:16px;background:var(--night-2);border-radius:var(--r);padding:16px 18px;
}
.co-lifted-lab{
  display:block;font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--night-ink-2);margin-bottom:9px;
}
.co-lifted p{font-size:14px;line-height:1.6;color:#fff;margin:0 0 9px}
.co-lifted-src{font-size:11px;color:var(--cyan);font-family:'IBM Plex Mono',monospace}

/* ══════════ 06 · FACETS ══════════ */
.co-fac{display:flex;flex-direction:column;gap:12px}
.co-fac-g{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.co-fac-h{
  font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3);
  width:100%;margin-bottom:1px;
}
.co-fac-o{
  font-size:11.5px;padding:4px 10px;border-radius:99px;
  border:1px solid var(--line);color:var(--ink-2);background:#fff;white-space:nowrap;
}
.co-fac-o b{font-weight:600;color:var(--ink-3);margin-left:4px;font-size:10.5px}
.co-fac-o.on{background:rgba(124,108,255,.1);border-color:rgba(124,108,255,.32);color:var(--violet)}
.co-fac-o.on b{color:var(--violet)}

/* ══════════ 07 · SORT ORDER ══════════ */
.co-sort-bar{
  font-size:10.5px;color:var(--ink-3);margin-bottom:10px;
  padding-bottom:8px;border-bottom:1px dashed var(--line);
}
.co-sort-bar b{color:var(--ink-2);font-weight:600}
.co-firstrow{display:grid;grid-template-columns:repeat(4,1fr);gap:7px}
.co-fr-card{
  background:var(--paper-2);border:1px solid var(--line-2);border-radius:8px;
  padding:7px 6px;display:flex;flex-direction:column;align-items:center;gap:3px;position:relative;
}
.co-fr-shot{width:100%;aspect-ratio:1;border-radius:6px;background:#E1E6F0}
.co-fr-a{font-size:10px;font-weight:600;color:var(--ink-2)}
.co-fr-b{font-size:10px;color:var(--ink-3)}
.co-fr-card.oos{opacity:.55}
.co-fr-oos{
  position:absolute;top:6px;left:50%;transform:translateX(-50%);
  font-size:10px;padding:2px 6px;border-radius:99px;
  background:#FFE9EF;color:#C2453F;border:1px solid #FFD2DE;white-space:nowrap;
}

/* ══════════ 08 · INTERNAL LINKS ══════════ */
.co-links-mk{
  background:#fff;border:1px solid var(--line-2);border-radius:var(--r);
  padding:clamp(16px,2.2vw,24px);
}
.co-lk{display:flex;flex-direction:column;align-items:center;gap:12px}
.co-lk-up,.co-lk-down{display:flex;flex-direction:column;align-items:center;gap:6px}
.co-lk-mid{
  display:grid;grid-template-columns:1fr auto 1fr;gap:12px;align-items:center;width:100%;
}
.co-lk-side{display:flex;flex-direction:column;gap:6px;align-items:center}
.co-lk-core{display:grid;place-items:center}
.co-lk-node{
  font-size:11.5px;padding:6px 11px;border-radius:8px;text-align:center;
  border:1px solid var(--line);background:var(--paper-2);color:var(--ink-2);line-height:1.35;
}
.co-lk-node.self{
  background:var(--grad);color:#08111C;font-weight:700;border-color:transparent;
  padding:10px 16px;font-size:13px;box-shadow:0 8px 22px rgba(124,108,255,.3);
}
.co-lk-node.guide{background:rgba(79,216,255,.1);border-color:rgba(79,216,255,.35);color:#0E7490}
.co-lk-node.up,.co-lk-node.down{background:#fff}
.co-lk-lab{font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3)}
/* Connectors are drawn, not implied: the shape is the argument. */
.co-lk-up::after,.co-lk-down::before{
  content:'';width:1px;height:14px;background:var(--line);display:block;
}
.co-lk-down{width:100%}
.co-lk-down .co-lk-node{width:auto}

/* ══════════ 09 · THE FAQ ══════════ */
.co-faq{list-style:none;display:flex;flex-direction:column;gap:9px}
.co-faq li{font-size:13px;color:var(--ink-3);padding-left:16px;position:relative}
.co-faq li::before{content:'?';position:absolute;left:0;top:0;color:#C9D0E0;font-weight:700;font-size:12px}
.co-faq.good li{padding-left:0;color:var(--ink-2)}
.co-faq.good li::before{content:none}
.co-faq.good b{display:block;font-size:13.5px;font-weight:600;color:var(--ink);margin-bottom:3px;letter-spacing:-.01em}
.co-faq.good span{font-size:12.5px;line-height:1.55;color:var(--ink-2)}
.co-faq-foot{
  margin-top:14px;padding-top:12px;border-top:1px dashed var(--line);
  display:flex;align-items:center;gap:7px;flex-wrap:wrap;
}
.co-src{font-size:10px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-3)}

/* ══════════ THE THREE READERS ══════════ */
.co-readers{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(14px,2vw,20px)}
.co-reader{
  background:var(--night-2);border:1px solid rgba(255,255,255,.08);
  border-radius:var(--r);padding:clamp(18px,2.4vw,26px);
}
.co-reader b{display:block;font-size:16px;color:#fff;letter-spacing:-.01em;margin-bottom:8px}
.co-q{
  display:block;font-size:13.5px;line-height:1.5;color:var(--cyan);
  font-style:italic;margin-bottom:10px;
}
.co-reader p{font-size:13.5px;line-height:1.6;color:var(--night-ink-2);margin:0}

/* ══════════ THE RESULT ══════════ */
.co-result{
  max-width:720px;margin:0 auto;background:#fff;border:1px solid var(--line-2);
  border-radius:var(--r-lg);padding:clamp(18px,2.6vw,26px);box-shadow:var(--shadow-sm);
}
.co-res-head,.co-res-row{display:grid;grid-template-columns:minmax(0,1fr) 74px 74px;gap:10px;align-items:center}
.co-res-head{padding-bottom:9px;border-bottom:1px solid var(--line-2)}
.co-res-lab{font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3);text-align:center}
.co-res-row{padding:11px 0;border-bottom:1px solid var(--line-2)}
.co-res-row:last-of-type{border-bottom:0}
.co-res-what{font-size:13.5px;color:var(--ink-2)}
.co-res-b,.co-res-a{
  text-align:center;font-size:15px;font-weight:600;border-radius:8px;padding:5px 0;
}
.co-res-b{color:var(--ink-3);background:var(--paper-2)}
.co-res-a{color:#0E7A5B;background:rgba(18,169,122,.1)}
/* The unchanged row is the point of the whole section, so it is stated rather
   than dressed up as an improvement. */
.co-res-same .co-res-a{color:var(--ink-3);background:var(--paper-2)}
.co-res-note{
  margin-top:16px;padding-top:14px;border-top:1px solid var(--line-2);
  font-size:12.5px;line-height:1.6;color:var(--ink-3);
}

/* ══════════ RESPONSIVE ══════════ */
@media (max-width:1000px){
  .co-flow4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .co-readers{grid-template-columns:1fr}
}
@media (max-width:900px){
  .ca-grid{grid-template-columns:repeat(3,1fr)}
  .cd-bar{grid-template-columns:1fr;gap:6px}
  .cd-q{font-size:13px}
}
@media (max-width:720px){
  .co-lk-mid{grid-template-columns:1fr;gap:10px}
  .co-lk-side{flex-direction:row;flex-wrap:wrap;justify-content:center}
  .co-lk-lab{width:100%;text-align:center}
}
@media (max-width:620px){
  .co-flow4{grid-template-columns:1fr}
  .ca-row{grid-template-columns:22px minmax(0,1fr);gap:8px}
  .ca-h1{font-size:16px}
  .co-firstrow{grid-template-columns:repeat(2,1fr)}
  .co-res-head,.co-res-row{grid-template-columns:minmax(0,1fr) 58px 58px;gap:8px}
  .co-res-what{font-size:12.5px}
  .co-res-b,.co-res-a{font-size:14px}
  .co-tt{grid-template-columns:1fr;gap:3px}
}