/* ============================================================================
   SERVE INNOVATE — BLOG
   ----------------------------------------------------------------------------
   Covers the blog index (/blog) and every article page (/blog/<slug>).

   Article typography was carried over from the original blog.html so published
   posts keep the exact reading experience that was signed off; everything else
   — the filter bar, the featured card, the table of contents, the share rail —
   is new and built on assets/ui.css primitives.
   ============================================================================ */

/* ============================================================================
   1. READING PROGRESS
   ============================================================================ */
.read-prog{position:fixed;top:0;left:0;height:3px;width:0;z-index:210;
  background:linear-gradient(90deg,#1f8fe0,#41c4ff,#a9e6ff);
  box-shadow:0 0 10px rgba(65,196,255,.6);border-radius:0 2px 2px 0;pointer-events:none}

/* ============================================================================
   2. INDEX — FILTER BAR
   ============================================================================ */
.filters{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:42px}
.fbtn{padding:10px 20px;border-radius:100px;border:1px solid var(--glass-line);background:rgba(98,198,255,.05);
  color:#bcd6f5;font-family:'Space Grotesk';font-weight:600;font-size:.88rem;cursor:pointer;
  transition:.32s var(--ease)}
.fbtn:hover{color:#fff;border-color:rgba(98,198,255,.36);transform:translateY(-2px)}
.fbtn.on{background:var(--grad-blue);border-color:transparent;color:#fff;
  box-shadow:0 12px 28px -12px rgba(57,167,255,.8)}
/* filtered-out cards collapse rather than merely hiding, so the grid reflows */
.bcard.hide{display:none}
.no-results{text-align:center;color:#9fc0e6;padding:40px 0;display:none}
.no-results.show{display:block}

/* ============================================================================
   3. INDEX — FEATURED POST
   ============================================================================ */
.feat{display:grid;grid-template-columns:1.05fr .95fr;gap:0;border-radius:var(--radius-lg);overflow:hidden;
  border:1px solid var(--glass-line);background:linear-gradient(160deg,rgba(10,34,72,.66),rgba(4,16,38,.5));
  margin-bottom:56px;transition:.5s var(--ease)}
.feat:hover{border-color:rgba(98,198,255,.34);box-shadow:0 40px 90px -40px rgba(2,10,26,.95)}
.feat-media{position:relative;min-height:330px;overflow:hidden;background:#0a2247}
.feat-media .cover-art{width:100%;height:100%;display:block;transition:transform 1.1s var(--ease)}
.feat:hover .feat-media .cover-art{transform:scale(1.06)}
.feat-media .ribbon{position:absolute;top:20px;left:20px;padding:8px 16px;border-radius:100px;
  background:rgba(2,10,26,.72);backdrop-filter:blur(10px);border:1px solid var(--glass-line);
  font-family:'Space Grotesk';font-weight:600;font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--sky-300)}
.feat-body{padding:40px 38px;display:flex;flex-direction:column;justify-content:center}
.feat-body h2{font-size:clamp(1.5rem,2.7vw,2.1rem);line-height:1.16;margin-bottom:16px}
.feat-body p{color:#a9c6e8;font-size:1rem;line-height:1.75;margin-bottom:22px}

/* ============================================================================
   4. INDEX — CARD GRID
   ============================================================================ */
.bgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.bcard{display:flex;flex-direction:column;border-radius:var(--radius);overflow:hidden;
  border:1px solid var(--glass-line);background:linear-gradient(170deg,rgba(10,34,72,.55),rgba(4,16,38,.42));
  transition:transform .45s var(--ease),border-color .45s var(--ease),box-shadow .45s var(--ease)}
.bcard:hover{transform:translateY(-8px);border-color:rgba(98,198,255,.34);
  box-shadow:0 34px 70px -34px rgba(2,10,26,.95)}
.bcard-top{height:186px;overflow:hidden;border-bottom:1px solid var(--glass-line);background:#0a2247}
.bcard-top .cover-art{width:100%;height:100%;display:block;transition:transform 1s var(--ease)}
.bcard:hover .bcard-top .cover-art{transform:scale(1.07)}
.bcard-body{padding:26px 24px;display:flex;flex-direction:column;gap:11px;flex:1}
.bcat{font-family:'Space Grotesk';font-weight:600;font-size:.72rem;letter-spacing:.15em;
  text-transform:uppercase;color:var(--sky-300)}
.bcard h3{font-size:1.13rem;line-height:1.32}
.bcard h3 a{transition:color .28s}
.bcard:hover h3 a{color:var(--sky-200)}
.bcard p{color:#a9c6e8;font-size:.93rem;line-height:1.7;flex:1}
.bmeta{display:flex;align-items:center;gap:10px;color:#7fa3cb;font-size:.82rem}
.bmeta .sep{width:4px;height:4px;border-radius:50%;background:currentColor;opacity:.55}
.rm{display:inline-flex;align-items:center;gap:8px;margin-top:4px;font-family:'Space Grotesk';
  font-weight:600;font-size:.9rem;color:var(--sky-300)}
.rm svg{width:15px;height:15px;stroke:currentColor;fill:none;stroke-width:2.4;transition:transform .3s var(--ease)}
.rm:hover svg,.bcard:hover .rm svg{transform:translateX(5px)}

/* ============================================================================
   5. ARTICLE PAGE
   ----------------------------------------------------------------------------
   Three-column shell: sticky share rail, the article column, sticky TOC.
   Both rails drop away under 1120px and the article keeps its measure.
   ============================================================================ */
.post-shell{display:grid;grid-template-columns:64px minmax(0,760px) 240px;gap:44px;justify-content:center;align-items:start}
.share-rail{position:sticky;top:130px;display:grid;gap:10px;justify-items:center}
.share-rail .lbl{writing-mode:vertical-rl;font-size:.68rem;letter-spacing:.18em;text-transform:uppercase;
  color:#6d90b8;margin-bottom:6px}
.share-rail a,.share-rail button{width:42px;height:42px;border-radius:13px;display:grid;place-items:center;
  border:1px solid var(--glass-line);background:rgba(98,198,255,.06);cursor:pointer;transition:.35s var(--ease)}
.share-rail a:hover,.share-rail button:hover{background:var(--grad-blue);border-color:transparent;
  transform:translateY(-3px);box-shadow:0 12px 26px -10px rgba(57,167,255,.8)}
.share-rail svg{width:17px;height:17px;stroke:var(--sky-300);fill:none;stroke-width:1.9;transition:stroke .3s}
.share-rail a:hover svg,.share-rail button:hover svg{stroke:#fff}
.copied{position:absolute;left:56px;padding:6px 12px;border-radius:9px;background:var(--navy-700);
  border:1px solid var(--glass-line);font-size:.76rem;color:#dbeaff;opacity:0;pointer-events:none;transition:.3s;white-space:nowrap}
.copied.show{opacity:1}

.toc{position:sticky;top:130px}
.toc .lbl{font-family:'Space Grotesk';font-weight:600;font-size:.72rem;letter-spacing:.15em;
  text-transform:uppercase;color:var(--sky-300);margin-bottom:14px}
.toc ul{list-style:none;display:grid;gap:1px;border-left:1px solid var(--glass-line)}
.toc a{display:block;padding:8px 14px;font-size:.86rem;line-height:1.5;color:#8fb4dd;
  border-left:2px solid transparent;margin-left:-1px;transition:.28s var(--ease)}
.toc a:hover{color:#dbeaff}
.toc a.on{color:#fff;border-left-color:var(--sky-400);background:rgba(98,198,255,.07)}

/* --- article header ------------------------------------------------------- */
.article{max-width:760px}
.article-cover{border:1px solid var(--glass-line);border-radius:var(--radius);overflow:hidden;
  margin-bottom:34px;background:#0a2247}
.article-cover .cov-inner{height:290px}
.cover-art{width:100%;height:100%;display:block}
.article-head{margin-bottom:30px}
.article-head .bcat{display:inline-block;margin-bottom:14px}
.article-head h1{font-size:clamp(1.95rem,3.8vw,2.7rem);line-height:1.14;margin-bottom:20px;text-wrap:balance}
.meta{display:flex;flex-wrap:wrap;align-items:center;gap:12px;color:#9fc0e6;font-size:.9rem}
.meta .who{display:flex;align-items:center;gap:9px;color:var(--ice)}
.meta .who .av{width:32px;height:32px;border-radius:50%;overflow:hidden;background:var(--grad-blue);
  display:grid;place-items:center;flex:none}
.meta .who .av img{width:24px;height:24px;border-radius:50%}
.meta .sep{width:4px;height:4px;border-radius:50%;background:currentColor;opacity:.5}

/* --- prose ---------------------------------------------------------------- */
.prose{color:#c7d4ea;font-size:1.05rem;line-height:1.82}
.prose>p{margin-bottom:20px}
.prose .lead{font-size:1.18rem;color:var(--ice);margin-bottom:26px}
.prose h2{font-size:1.5rem;margin:44px 0 14px;color:#fff;scroll-margin-top:110px}
.prose h3{font-size:1.16rem;margin:28px 0 10px;color:#fff;scroll-margin-top:110px}
.prose strong{color:#fff;font-weight:600}
.prose ul,.prose ol{list-style:none;margin:0 0 22px;display:grid;gap:12px;counter-reset:pn}
.prose ul li{position:relative;padding-left:26px}
.prose ul li::before{content:"";position:absolute;left:0;top:10px;width:8px;height:8px;border-radius:2px;background:var(--grad-blue)}
.prose ol li{position:relative;padding-left:38px;counter-increment:pn}
.prose ol li::before{content:counter(pn);position:absolute;left:0;top:1px;width:25px;height:25px;border-radius:8px;
  display:grid;place-items:center;font-family:'Space Grotesk';font-weight:700;font-size:.78rem;color:#fff;background:var(--grad-blue)}
.prose blockquote{border-left:3px solid var(--blue-400);background:rgba(47,123,240,.07);padding:18px 24px;
  border-radius:0 14px 14px 0;margin:30px 0;color:var(--ice);font-family:'Space Grotesk';font-weight:500;
  font-size:1.12rem;line-height:1.58}
.prose a{color:var(--sky-300);text-decoration:underline;text-underline-offset:3px}
.prose a:hover{color:var(--sky-200)}
.callout{border:1px solid rgba(98,198,255,.28);background:rgba(47,123,240,.07);border-radius:var(--radius);
  padding:28px;margin:36px 0}
.callout h3{margin:0 0 9px;font-size:1.12rem}
.callout p{margin:0;color:#a9c6e8}
.ptable{width:100%;border-collapse:collapse;margin:26px 0;font-size:.95rem}
.ptable th,.ptable td{padding:13px 16px;text-align:left;border-bottom:1px solid var(--glass-line)}
.ptable th{font-family:'Space Grotesk';font-weight:600;color:#fff;background:rgba(98,198,255,.06)}
.ptable td{color:#a9c6e8}
.ptable tr:hover td{background:rgba(98,198,255,.03)}

/* --- tags + author + read next -------------------------------------------- */
.post-tags{display:flex;flex-wrap:wrap;gap:9px;margin:40px 0 0}
.post-tags a{font-size:.8rem;padding:7px 14px;border-radius:100px;background:rgba(98,198,255,.06);
  border:1px solid var(--glass-line);color:#9fc0e6;transition:.3s}
.post-tags a:hover{color:#fff;border-color:rgba(98,198,255,.4)}
.author-box{display:flex;gap:20px;align-items:flex-start;padding:26px;margin-top:34px;border-radius:var(--radius);
  border:1px solid var(--glass-line);background:rgba(7,26,56,.45)}
.author-box .ab-av{width:58px;height:58px;flex:none;border-radius:16px;display:grid;place-items:center;
  background:var(--grad-blue);box-shadow:0 12px 28px -12px rgba(57,167,255,.8)}
.author-box .ab-av img{width:36px;height:36px}
.author-box h3{font-size:1.05rem;margin-bottom:7px}
.author-box p{color:#a9c6e8;font-size:.93rem;line-height:1.7}
.readnext{margin-top:56px;padding-top:36px;border-top:1px solid var(--glass-line)}
.readnext .lbl{font-family:'Space Grotesk';font-weight:600;letter-spacing:.14em;text-transform:uppercase;
  font-size:.72rem;color:var(--sky-300);margin-bottom:20px}
.readnext .bgrid{grid-template-columns:repeat(2,1fr)}

/* ============================================================================
   6. RESPONSIVE
   ============================================================================ */
@media(max-width:1180px){
  .post-shell{grid-template-columns:64px minmax(0,760px);gap:36px}
  .toc{display:none}
}
@media(max-width:1024px){
  .bgrid{grid-template-columns:repeat(2,1fr)}
  .feat{grid-template-columns:1fr}
  .feat-media{min-height:250px}
}
@media(max-width:880px){
  .post-shell{grid-template-columns:minmax(0,1fr)}
  .share-rail{position:static;grid-auto-flow:column;justify-content:start;justify-items:start;margin-bottom:24px}
  .share-rail .lbl{writing-mode:horizontal-tb;margin:0 6px 0 0;align-self:center}
  .copied{left:auto;right:0;top:-38px}
}
@media(max-width:680px){
  .bgrid,.readnext .bgrid{grid-template-columns:1fr}
  .feat-body{padding:30px 24px}
  .article-cover .cov-inner{height:200px}
  .prose{font-size:1rem}
  .author-box{flex-direction:column;gap:14px}
  .ptable{display:block;overflow-x:auto;white-space:nowrap}
}
@media(prefers-reduced-motion:reduce){
  .feat:hover .feat-media .cover-art,.bcard:hover .bcard-top .cover-art{transform:none}
}