/* ---------- Spyce article page ---------- */
.read-bar{position:fixed;inset:0 0 auto;height:3px;z-index:120;pointer-events:none}
.read-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--c-300),var(--c-500));transform-origin:right;transform:scaleX(0)}

.art{padding-top:clamp(28px,5vw,64px)}
.art-hero{max-width:900px;margin-inline:auto;display:flex;flex-direction:column;align-items:flex-start;gap:18px}
.crumbs{display:flex;align-items:center;gap:10px;font-size:15px;color:var(--mute)}
.crumbs a{color:var(--mute);transition:color .2s}
.crumbs a:hover{color:var(--c-700)}
.crumbs span{opacity:.5}
.art-hero h1{font-size:clamp(36px,5.4vw,64px);line-height:1.08;letter-spacing:-.03em;text-wrap:balance}
.art-dek{margin:0;font-size:clamp(18px,1.7vw,21px);line-height:1.65;color:var(--ink-2);max-width:62ch;text-wrap:pretty}
.art-meta{display:flex;align-items:center;flex-wrap:wrap;gap:12px;font-size:15px;color:var(--mute);margin-top:2px}
.art-by{display:inline-flex;align-items:center;gap:8px;color:var(--ink);font-weight:700}
.art-by img{width:30px;height:30px;border-radius:50%;background:var(--card);padding:4px;object-fit:contain;box-shadow:var(--shadow-soft)}
.art-meta .dot{width:4px;height:4px;border-radius:50%;background:var(--c-300)}
.art-hero .a-cover{width:100%;aspect-ratio:16/8;border-radius:var(--r-xl);margin-top:clamp(12px,2vw,24px);box-shadow:var(--shadow-soft)}

/* grid: reading column + sticky contents (contents sits on the reading-end side) */
.art-grid{max-width:1060px;margin-inline:auto;display:grid;grid-template-columns:minmax(0,1fr) 264px;grid-template-areas:"body toc";gap:clamp(40px,6vw,88px);padding-top:clamp(36px,5vw,64px);align-items:start}
.art-body{grid-area:body;max-width:680px;min-width:0}
.toc{grid-area:toc;position:sticky;top:124px}

.toc-box{background:var(--card);border-radius:var(--r-md);box-shadow:var(--shadow-soft);padding:20px 20px 14px}
.toc-box summary{list-style:none;display:flex;align-items:center;justify-content:space-between;gap:10px;font-weight:700;font-size:16px;cursor:default;pointer-events:none}
.toc-box summary::-webkit-details-marker{display:none}
.toc-box summary svg{width:20px;height:20px;display:none;transition:transform .4s cubic-bezier(.2,.8,.2,1)}
.toc-body{overflow:hidden}
.toc-box ol{list-style:none;margin:12px 0 0;padding:0;display:flex;flex-direction:column;counter-reset:t}
.toc-box li{counter-increment:t}
.toc-box a{display:grid;grid-template-columns:22px 1fr;gap:6px;padding:9px 0;font-size:15px;line-height:1.45;color:var(--ink-2);border-top:1px solid var(--hair);transition:color .2s}
.toc-box li:first-child a{border-top:0}
.toc-box a::before{content:counter(t);font-size:13px;font-weight:700;color:var(--mute);padding-top:1px;transition:color .2s}
.toc-box a:hover,.toc-box a.is-on{color:var(--c-700)}
.toc-box a.is-on::before{color:var(--c-500)}

/* reading type */
.art-body>p{margin:0 0 1.15em;font-size:19px;line-height:1.85;color:var(--ink-2);text-wrap:pretty}
.art-body>p.lede{font-size:clamp(20px,1.9vw,22px);line-height:1.75;color:var(--ink)}
.art-body>h2{font-size:clamp(25px,2.4vw,30px);line-height:1.2;letter-spacing:-.02em;margin:1.9em 0 .6em;scroll-margin-top:120px;text-wrap:balance}
.cite{font-size:0;vertical-align:super;line-height:0;margin-inline-start:3px}
.cite a{display:inline-grid;place-items:center;min-width:20px;height:20px;padding-inline:5px;border-radius:999px;background:var(--c-100);color:var(--c-700);font-size:12px;font-weight:700;line-height:1;transition:background .2s,color .2s}
.cite a:hover{background:var(--c-500);color:#fff}

.sources{margin-top:clamp(40px,5vw,60px);background:var(--bg-2);border-radius:var(--r-lg);padding:clamp(22px,3vw,32px)}
.sources h2{font-size:20px;margin:0 0 14px;scroll-margin-top:120px}
.sources ol{margin:0;padding-inline-start:22px;display:flex;flex-direction:column;gap:14px}
.sources li{font-size:15.5px;line-height:1.7;color:var(--mute);scroll-margin-top:130px;border-radius:10px;transition:background-color .6s}
.sources li::marker{color:var(--c-700);font-weight:700}
.sources li:target{background:var(--c-50)}
.sources a{color:var(--ink);font-weight:700;text-decoration:underline;text-decoration-color:var(--c-300);text-underline-offset:3px;overflow-wrap:anywhere}
.sources a:hover{color:var(--c-700)}

.art-back{display:inline-flex;align-items:center;gap:8px;margin-top:32px;font-weight:700;color:var(--c-700)}
.art-back span{transition:transform .25s}
.art-back:hover span{transform:translateX(4px)}

@media (max-width:980px){
  .art-grid{grid-template-columns:minmax(0,1fr);grid-template-areas:"toc" "body";gap:28px;padding-top:28px}
  .art-body{max-width:none}
  .toc{position:static}
  .toc-box{padding:0}
  .toc-box summary{pointer-events:auto;cursor:pointer;padding:18px 20px}
  .toc-box summary svg{display:block}
  .toc-box.is-open summary svg{transform:rotate(180deg)}
  .toc-box ol{margin:0;padding:0 20px 10px}
  .toc-box summary{-webkit-tap-highlight-color:transparent}
}
@media (max-width:640px){
  .art-hero{gap:14px}
  .art-hero h1{font-size:clamp(32px,9vw,40px)}
  .art-hero .a-cover{aspect-ratio:4/3;border-radius:var(--r-lg)}
  .art-body>p{font-size:17.5px;line-height:1.8}
  .art-body>p.lede{font-size:19px}
  .art-body>h2{font-size:24px}
}
@media (prefers-reduced-motion:reduce){.read-bar{display:none}}