/* ==========================================================================
   DrNourit — page-level layouts
   Depends on brand.css for tokens. Load second.
   ========================================================================== */

/* --------------------------------------------------------------------------
   HOME · hero
   The walnut photo is the brand's central image: a walnut kernel already
   *is* a brain in miniature. Light radiates from it outward into neural
   traces — the visual argument that food reaches the mind.
   -------------------------------------------------------------------------- */
.hero{position:relative;padding:64px 0 0;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:48px;align-items:center}
.hero h1{
  font-size:clamp(38px,5.4vw,68px);
  line-height:1.04;margin:24px 0 0;font-weight:200;
}
.hero h1 b{font-weight:700}
.hero h1 em{font-style:normal;color:var(--walnut)}
.hero .lead{
  font-size:clamp(17px,1.9vw,20px);color:var(--muted);
  max-width:36ch;margin:26px 0 22px;line-height:1.62;
}
.hero-credit{
  display:flex;align-items:center;gap:10px;flex-wrap:wrap;
  font-size:14.5px;color:var(--faint);margin-bottom:32px;
}
.hero-credit .sep{width:4px;height:4px;border-radius:50%;background:var(--line);flex:none}
.hero-credit b{color:var(--muted);font-weight:600}

/* bilingual / dual-nationality badge — a real differentiator, so it gets
   its own object rather than being buried in the credit line */
.hero-langs{
  display:inline-flex;align-items:center;gap:10px;margin-bottom:30px;
  font-size:14.5px;color:var(--teal-deep);line-height:1.4;
  background:var(--teal-wash);border:1px solid #D8ECEE;
  padding:9px 16px;border-radius:999px;
}
.hero-langs svg{
  width:17px;height:17px;flex:none;stroke:var(--teal);fill:none;stroke-width:1.7;
  stroke-linecap:round;stroke-linejoin:round;
}
.hero-langs b{font-weight:600}

.hero-cta{display:flex;gap:14px;flex-wrap:wrap}

.hero-visual{
  position:relative;display:flex;align-items:center;justify-content:center;
  min-height:460px;
}

/* layered light — warm core, cool halo */
.hero-visual .glow{position:absolute;border-radius:50%;pointer-events:none;z-index:0}
.hero-visual .glow-warm{
  width:78%;aspect-ratio:1;
  background:radial-gradient(circle,rgba(245,200,122,.55) 0%,rgba(245,200,122,.14) 42%,transparent 68%);
  filter:blur(18px);
  animation:breathe 7.5s ease-in-out infinite;
}
.hero-visual .glow-cool{
  width:112%;aspect-ratio:1;
  background:radial-gradient(circle,rgba(20,169,186,.20) 0%,rgba(20,169,186,.05) 45%,transparent 70%);
  filter:blur(26px);
  animation:breathe 9s ease-in-out infinite reverse;
}
@keyframes breathe{
  0%,100%{transform:scale(1);opacity:.9}
  50%{transform:scale(1.07);opacity:1}
}

/* radiating light beams behind the kernel */
.hero-visual .rays{
  position:absolute;width:112%;aspect-ratio:1;z-index:0;pointer-events:none;
  background:repeating-conic-gradient(
    from 0deg,
    rgba(245,200,122,.30) 0deg .7deg,
    transparent .7deg 5deg,
    rgba(20,169,186,.14) 5deg 5.5deg,
    transparent 5.5deg 11deg
  );
  -webkit-mask-image:radial-gradient(circle,transparent 27%,#000 45%,transparent 76%);
  mask-image:radial-gradient(circle,transparent 27%,#000 45%,transparent 76%);
  animation:turn 90s linear infinite;
}
@keyframes turn{to{transform:rotate(360deg)}}

.walnut{
  position:relative;z-index:2;width:min(368px,76%);height:auto;
  filter:drop-shadow(0 26px 52px rgba(124,69,23,.30));
  animation:hover-y 8s ease-in-out infinite;
}
@keyframes hover-y{0%,100%{transform:translateY(0)}50%{transform:translateY(-13px)}}

/* neural traces drawn over the kernel, carrying light outward */
.traces{position:absolute;z-index:3;width:min(620px,116%);aspect-ratio:1;pointer-events:none}

/* the connection is always drawn; the pulse only adds motion on top */
.traces .rest path{stroke:var(--teal);opacity:.22;stroke-width:1.4}
.traces .rest circle{fill:var(--teal);opacity:.3}

.traces .live path{
  stroke:var(--teal-bright);fill:none;stroke-width:1.8;stroke-linecap:round;
  stroke-dasharray:var(--len,140);stroke-dashoffset:var(--len,140);
  animation:draw 4.5s ease-in-out infinite;
}
@keyframes draw{
  0%{stroke-dashoffset:var(--len,140);opacity:0}
  20%{opacity:.95}
  58%{stroke-dashoffset:0;opacity:.95}
  100%{stroke-dashoffset:0;opacity:0}
}
.traces .node{fill:var(--teal);animation:spark 4.5s ease-in-out infinite}
.traces .node-halo{fill:var(--teal-bright);opacity:.18;animation:spark 4.5s ease-in-out infinite}
@keyframes spark{
  0%,42%{opacity:0;transform:scale(.4)}
  60%{opacity:1;transform:scale(1)}
  100%{opacity:0;transform:scale(.7)}
}
.traces .node,.traces .node-halo{transform-box:fill-box;transform-origin:center}

/* comp watermark badge — delete this element once a licensed image is in place */
.img-comp{
  position:absolute;bottom:-4px;left:50%;transform:translateX(-50%);z-index:4;
  white-space:nowrap;
  font-size:12px;color:var(--faint);
  background:rgba(255,255,255,.9);border:1px solid var(--line);
  padding:5px 12px;border-radius:999px;
}

/* --------------------------------------------------------------------------
   HOME · lecture catalog
   -------------------------------------------------------------------------- */
.catalog{display:grid;grid-template-columns:repeat(6,1fr);gap:20px}
.prod{
  grid-column:span 3;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r);padding:32px 30px 28px;position:relative;overflow:hidden;
  box-shadow:var(--shadow-sm);display:flex;flex-direction:column;
  transition:transform .35s cubic-bezier(.2,.7,.2,1),box-shadow .35s,border-color .35s;
}
.prod::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:0;transition:opacity .4s;
  background:linear-gradient(130deg,transparent 42%,var(--teal-wash) 140%);
}
.prod:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:#D6E2E6}
.prod:hover::before{opacity:.9}
.prod:hover .go{background:var(--ink);color:#fff;border-color:var(--ink)}
.prod.feature{
  grid-column:span 6;display:grid;grid-template-columns:1.25fr 1fr;gap:38px;
  align-items:center;padding:42px;
}
.prod-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;position:relative;z-index:1}
.sku{font-family:'JetBrains Mono',monospace;direction:ltr;unicode-bidi:isolate;
  font-size:12px;letter-spacing:.1em;color:var(--faint);transition:color .3s}
.prod:hover .sku{color:var(--teal)}
.prod h3{font-weight:600;font-size:22px;margin:22px 0 10px;position:relative;z-index:1;line-height:1.3}
.prod.feature h3{font-size:clamp(26px,3vw,34px);font-weight:700}
.prod > p,.prod .body p{color:var(--muted);font-size:15.5px;position:relative;z-index:1}
.prod.feature .body p{font-size:17.5px}
.prod .spacer{flex:1}
.prod .sub,.prod .body .sub{font-weight:500;font-size:15.5px;color:var(--teal);margin:-4px 0 12px;position:relative;z-index:1;line-height:1.45}
.prod.feature .body .sub{font-size:18px}
.prod-list{margin:10px 0 0;padding-inline-start:20px;color:var(--muted);font-size:15px;position:relative;z-index:1}
.prod-list li{margin-bottom:6px}
.go{
  display:inline-flex;align-items:center;gap:8px;margin-top:20px;align-self:flex-start;
  font-family:'Heebo',sans-serif;font-size:14.5px;font-weight:500;
  border:1px solid var(--line);border-radius:999px;padding:9px 17px;
  position:relative;z-index:1;color:var(--ink);
  transition:background .25s,color .25s,border-color .25s;
}

/* featured card visual — kernel cross-section motif */
.feature-visual{
  position:relative;border-radius:18px;min-height:250px;overflow:hidden;
  background:
    radial-gradient(circle at 30% 28%,rgba(245,200,122,.42),transparent 58%),
    linear-gradient(158deg,var(--walnut-wash),var(--teal-wash));
  display:flex;align-items:center;justify-content:center;
}
.feature-visual svg{width:62%;height:auto}

/* --------------------------------------------------------------------------
   HOME · about teaser
   -------------------------------------------------------------------------- */
.about-grid{display:grid;grid-template-columns:.82fr 1.18fr;gap:56px;align-items:center}
.portrait{
  position:relative;border-radius:var(--r);overflow:hidden;aspect-ratio:4/5;
  background:linear-gradient(158deg,#E7F0F2,#F8EFE3);border:1px solid var(--line);
}
.portrait picture{display:block;width:100%;height:100%}
.portrait img{width:100%;height:100%;object-fit:cover;object-position:center top}
.portrait .ph{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  flex-direction:column;gap:12px;color:var(--faint);text-align:center;padding:24px;
}
.portrait .ph svg{width:60px;height:60px;stroke:var(--faint);fill:none;stroke-width:1.3}
.portrait .ph span{font-size:13px;line-height:1.5}
.about-copy h2{font-size:clamp(30px,4vw,44px)}
.about-copy h2 b{font-weight:700}
.about-copy h2 em{font-style:normal;color:var(--walnut)}
.role{
  color:var(--teal);font-weight:600;font-size:17px;margin:10px 0 22px;
  font-family:'Heebo',sans-serif;
}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:34px 0 30px}

/* Government recognition. The strongest single credential on the site, so it
   leads the stats block and spans it — competing as a fourth number would
   bury it next to metrics it outranks. */
.stat-feature{
  grid-column:1/-1;display:flex;align-items:center;gap:15px;
  background:
    radial-gradient(circle at 8% 50%,rgba(245,200,122,.34),transparent 58%),
    var(--walnut-wash);
  border:1px solid #F0DFC9;border-radius:var(--r-sm);
  padding:17px 20px;box-shadow:var(--shadow-sm);
  transition:transform .3s,box-shadow .3s,border-color .3s;
}
a.stat-feature:hover{
  transform:translateY(-2px);box-shadow:var(--shadow-md);border-color:var(--walnut-light);
}
.stat-feature .medal{
  width:36px;height:36px;flex:none;stroke:var(--walnut);fill:none;stroke-width:1.6;
  stroke-linecap:round;stroke-linejoin:round;
}
.stat-feature .txt{display:grid;gap:3px;min-width:0}
.stat-feature .t{
  font-family:'Heebo',sans-serif;font-weight:600;font-size:15.5px;
  color:var(--walnut-deep);line-height:1.35;
}
.stat-feature .s{font-size:13.5px;color:var(--muted);line-height:1.4}
.stat-feature .ext{margin-inline-start:auto;flex:none;color:var(--walnut);font-size:16px}
.stat{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-sm);
  padding:22px 20px;box-shadow:var(--shadow-sm);
}
.stat .num{
  font-family:'Heebo',sans-serif;font-weight:200;font-size:42px;line-height:1;
  letter-spacing:-.02em;
  color:var(--ink);direction:ltr;unicode-bidi:isolate;display:block;
}
.stat .num small{font-size:.55em;color:var(--walnut);font-weight:500}
.stat .cap{font-size:13.5px;color:var(--muted);margin-top:9px;line-height:1.45}

/* --------------------------------------------------------------------------
   HOME · audiences
   -------------------------------------------------------------------------- */
.aud-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.aud-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r);
  padding:30px 26px;transition:transform .3s,border-color .3s,box-shadow .3s;
  box-shadow:var(--shadow-sm);
}
.aud-card:hover{transform:translateY(-4px);border-color:var(--teal-bright);box-shadow:var(--shadow-md)}
.aud-card .n{font-family:'JetBrains Mono',monospace;direction:ltr;unicode-bidi:isolate;
  font-size:12px;color:var(--faint);letter-spacing:.1em}
.aud-card .a-icon{width:46px;height:46px;margin:18px 0 20px}
.aud-card .a-icon svg{width:46px;height:46px;stroke:var(--walnut);fill:none;stroke-width:1.6;
  stroke-linecap:round;stroke-linejoin:round}
.aud-card h3{font-weight:600;font-size:19px;margin-bottom:10px}
.aud-card p{color:var(--muted);font-size:15px}

/* --------------------------------------------------------------------------
   ABOUT page
   -------------------------------------------------------------------------- */
.page-head{padding:56px 0 34px}
.page-head h1{font-size:clamp(34px,5vw,58px);margin-top:20px;line-height:1.06}
.page-head h1 b{font-weight:700}
.page-head h1 em{font-style:normal;color:var(--walnut)}
.page-head .lead{color:var(--muted);font-size:19px;margin-top:20px;max-width:56ch}

.bio-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:56px;align-items:start}
.bio-side{position:sticky;top:calc(var(--nav-h) + 28px);display:grid;gap:20px}
.cred-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r);
  padding:26px 24px;box-shadow:var(--shadow-sm);
}
.cred-card h3{font-size:15px;font-weight:600;margin-bottom:16px;color:var(--ink)}
.cred-list{list-style:none;display:grid;gap:15px}
.cred-list li{display:grid;gap:3px}
.cred-list .t{font-size:15.5px;color:var(--ink);font-weight:600;font-family:'Heebo',sans-serif;line-height:1.4}
.cred-list .s{font-size:14px;color:var(--muted);line-height:1.45}
.metric-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.metric{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-sm);
  padding:16px 12px;text-align:center;
}
.metric .v{
  font-family:'Heebo',sans-serif;font-size:32px;font-weight:200;line-height:1;
  letter-spacing:-.02em;
  color:var(--ink);direction:ltr;unicode-bidi:isolate;display:block;
}
.metric .l{font-size:12px;color:var(--faint);margin-top:7px;line-height:1.3}

/* external link inside a credential list item */
.cred-list .ext{
  display:inline-block;margin-top:7px;font-size:13.5px;color:var(--teal);
  text-decoration:underline;text-underline-offset:3px;
  text-decoration-color:rgba(10,124,138,.35);
}
.cred-list .ext:hover{text-decoration-color:var(--teal)}

/* --------------------------------------------------------------------------
   ABOUT · the trial currently running
   -------------------------------------------------------------------------- */
.study{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r);
  padding:36px 34px;box-shadow:var(--shadow-sm);position:relative;overflow:hidden;
}
.study::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(ellipse 62% 72% at 100% 0,rgba(245,200,122,.22),transparent 62%);
}
.study > *{position:relative;z-index:1}
.study h2{font-size:clamp(24px,3vw,33px);font-weight:300;margin:16px 0 18px}
.study h2 b{font-weight:700}
.study p{color:var(--muted);font-size:17px;margin-bottom:16px}
.study-facts{
  display:grid;grid-template-columns:repeat(4,1fr);gap:18px;
  margin:26px 0;padding:22px 0;border-block:1px solid var(--line-soft);
}
.study-facts div{display:grid;gap:4px;align-content:start}
.study-facts .k{font-size:12.5px;color:var(--faint);font-family:'Heebo',sans-serif;font-weight:500}
.study-facts .v{
  font-size:15.5px;color:var(--ink);font-weight:600;
  font-family:'Heebo',sans-serif;line-height:1.35;
}
.study .caveat{
  font-size:15px;color:var(--muted);line-height:1.6;background:var(--bg);
  border:1px solid var(--line);border-radius:var(--r-xs);padding:17px 19px;margin:4px 0 22px;
}
.study .caveat strong{color:var(--ink);font-weight:600}
.study .src-link{
  display:inline-flex;align-items:center;gap:8px;font-size:15px;color:var(--teal);
  font-family:'Heebo',sans-serif;font-weight:500;
}
.study .src-link:hover{text-decoration:underline;text-underline-offset:4px}

/* pull quote — the researchers' own published statement */
.pullquote{
  margin:56px 0;padding-inline-start:28px;
  border-inline-start:3px solid var(--walnut-light);
}
.pullquote p{
  font-family:'Heebo',sans-serif;font-weight:200;letter-spacing:-.01em;
  font-size:clamp(20px,2.4vw,27px);line-height:1.46;color:var(--ink);
}
.pullquote cite{
  display:block;margin-top:16px;font-style:normal;font-size:14px;color:var(--faint);line-height:1.5;
}

.pub-list{list-style:none;display:grid;gap:0;margin-top:8px}
/* The bibliography is English. Rendering it LTR keeps citation segments in
   their written order (authors · journal · n) — under the page's RTL base
   direction the bidi algorithm reorders them into nonsense. */
.pub{
  direction:ltr;text-align:left;
  padding:24px 0;border-bottom:1px solid var(--line);
  display:grid;grid-template-columns:auto 1fr;gap:20px;align-items:start;
}
.pub:first-child{border-top:1px solid var(--line)}
.pub .yr{
  font-family:'JetBrains Mono',monospace;
  font-size:13px;color:var(--walnut);font-weight:500;padding-top:3px;
}
.pub h3{font-size:17.5px;font-weight:600;line-height:1.45;margin-bottom:7px}
.pub h3 a{transition:color .2s}
.pub h3 a:hover{color:var(--teal)}
.pub .meta{font-size:14.5px;color:var(--muted);line-height:1.5}
.pub .meta em{font-style:italic;color:var(--ink-soft)}
.pub .tags{display:flex;flex-wrap:wrap;gap:7px;margin-top:11px;direction:ltr}
.tag{
  font-size:12.5px;color:var(--teal-deep);background:var(--teal-wash);
  border:1px solid #D8ECEE;padding:3px 11px;border-radius:999px;
}
.tag.w{color:var(--walnut-deep);background:var(--walnut-wash);border-color:#F0DFC9}

/* --------------------------------------------------------------------------
   LECTURE pages
   -------------------------------------------------------------------------- */
.lec-hero{
  position:relative;overflow:hidden;padding:58px 0 66px;
  border-bottom:1px solid var(--line);
}
.lec-hero::before{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(ellipse 70% 60% at 82% 18%,var(--hero-a,rgba(20,169,186,.16)),transparent 62%),
    radial-gradient(ellipse 60% 55% at 12% 88%,var(--hero-b,rgba(245,200,122,.20)),transparent 60%);
}
.lec-hero .wrap{position:relative;z-index:1}
.crumbs{display:flex;align-items:center;gap:9px;font-size:14px;color:var(--faint);margin-bottom:26px;flex-wrap:wrap}
.crumbs a:hover{color:var(--teal)}
.crumbs .sep{opacity:.5}
.lec-hero h1{font-size:clamp(32px,4.8vw,58px);margin:18px 0 0;max-width:19ch}
.lec-hero h1 b{font-weight:700}
.lec-hero h1 em{font-style:normal;color:var(--walnut)}
.lec-hero .lead{font-size:clamp(17px,1.9vw,20.5px);color:var(--muted);max-width:54ch;margin-top:22px}
.lec-hero-grid{display:grid;grid-template-columns:1.35fr .65fr;gap:48px;align-items:center}
.lec-mark{
  position:relative;aspect-ratio:1;border-radius:26px;overflow:hidden;
  background:linear-gradient(158deg,var(--walnut-wash),var(--teal-wash));
  border:1px solid var(--line);display:flex;align-items:center;justify-content:center;
}
.lec-mark svg{width:80%;height:auto}

.meta-bar{
  display:flex;flex-wrap:wrap;gap:12px;margin-top:34px;
}
.meta-pill{
  display:inline-flex;align-items:center;gap:9px;background:var(--surface);
  border:1px solid var(--line);border-radius:999px;padding:9px 17px;
  font-size:14.5px;color:var(--ink);box-shadow:var(--shadow-sm);
}
.meta-pill svg{width:16px;height:16px;stroke:var(--teal);fill:none;stroke-width:1.8;
  stroke-linecap:round;stroke-linejoin:round;flex:none}
.meta-pill .mk{color:var(--faint)}

/* takeaways */
.take-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.take{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r);
  padding:28px 26px;box-shadow:var(--shadow-sm);
  transition:transform .3s,box-shadow .3s,border-color .3s;
}
.take:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:#D6E2E6}
.take .tnum{
  font-family:'JetBrains Mono',monospace;direction:ltr;unicode-bidi:isolate;
  font-size:12px;color:var(--walnut);letter-spacing:.1em;
}
.take h3{font-size:18.5px;font-weight:600;margin:14px 0 9px;line-height:1.35}
.take p{color:var(--muted);font-size:15.5px}

/* session outline */
.outline{display:grid;gap:0;position:relative}
.seg{
  display:grid;grid-template-columns:96px 1fr;gap:26px;
  padding:26px 0;border-bottom:1px solid var(--line);align-items:start;
}
.seg:first-child{border-top:1px solid var(--line)}
.seg .clock{
  font-family:'JetBrains Mono',monospace;direction:ltr;unicode-bidi:isolate;
  font-size:14px;color:var(--teal);font-weight:500;padding-top:4px;
  display:flex;align-items:center;gap:9px;
}
.seg .clock::before{
  content:"";width:8px;height:8px;border-radius:50%;background:var(--teal-bright);
  box-shadow:0 0 0 4px var(--teal-wash);flex:none;
}
.seg h3{font-size:19px;font-weight:600;margin-bottom:8px}
.seg p{color:var(--muted);font-size:16px}

/* research backing */
.research{background:var(--ink);color:#fff;border-radius:32px;padding:56px 52px;position:relative;overflow:hidden}
.research::after{
  content:"";position:absolute;left:-90px;bottom:-110px;width:360px;height:360px;
  background:radial-gradient(circle,rgba(245,200,122,.18),transparent 70%);pointer-events:none;
}
.research > *{position:relative;z-index:1}
.research h2{color:#fff;font-size:clamp(26px,3.2vw,38px);margin:18px 0 14px;font-weight:300}
.research h2 em{font-style:normal;color:var(--glow)}
.research > p{color:#B7C6CE;font-size:17.5px;max-width:62ch}
.cite-list{list-style:none;display:grid;gap:16px;margin-top:34px}
.cite{
  background:rgba(255,255,255,.055);border:1px solid rgba(255,255,255,.12);
  border-radius:var(--r-sm);padding:24px 26px;
  transition:background .25s,border-color .25s;
}
.cite:hover{background:rgba(255,255,255,.09);border-color:rgba(255,255,255,.24)}
/* Hebrew finding leads (RTL); the English source sits below it as an
   LTR block so the citation segments keep their written order. */
.cite .finding{font-size:16.5px;color:#E4EDF1;line-height:1.6}
.cite .src-block{
  direction:ltr;text-align:left;margin-top:18px;padding-top:16px;
  border-top:1px solid rgba(255,255,255,.11);
}
.cite h3{font-size:14.5px;font-weight:600;color:#B7C6CE;line-height:1.45;margin-bottom:6px}
.cite .ref{font-size:13.5px;color:#8395A0;line-height:1.55}
.cite .ref em{font-style:italic;color:#A3B3BD}
.cite .doi{
  display:inline-flex;align-items:center;gap:7px;margin-top:10px;font-size:12.5px;
  color:var(--teal-bright);font-family:'JetBrains Mono',monospace;letter-spacing:.02em;
}
.cite .doi:hover{text-decoration:underline;text-underline-offset:3px}
.research-note{
  margin-top:26px;font-size:14.5px;color:#8395A0;padding-top:20px;
  border-top:1px solid rgba(255,255,255,.12);
}

/* related lectures */
.rel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.rel{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r);
  padding:26px 24px;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;
  transition:transform .3s,box-shadow .3s,border-color .3s;
}
.rel:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:#D6E2E6}
.rel .sku{margin-bottom:12px}
.rel h3{font-size:18px;font-weight:600;line-height:1.35;margin-bottom:8px}
.rel p{color:var(--muted);font-size:15px;flex:1}
.rel .go{margin-top:18px}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media(max-width:960px){
  .hero{padding-top:34px}
  .hero-grid{grid-template-columns:1fr;gap:34px}
  /* headline stays first on mobile — the previous build pushed it below the fold */
  .hero-visual{min-height:360px;order:2}
  .hero .lead{max-width:none}
  .catalog{grid-template-columns:1fr}
  .prod,.prod.feature{grid-column:span 1}
  .prod.feature{grid-template-columns:1fr;padding:30px 26px}
  .about-grid{grid-template-columns:1fr;gap:36px}
  .aud-grid{grid-template-columns:1fr 1fr}
  .bio-grid{grid-template-columns:1fr;gap:36px}
  .bio-side{position:static}
  .lec-hero-grid{grid-template-columns:1fr;gap:34px}
  .lec-mark{max-width:280px;order:-1}
  .take-grid{grid-template-columns:1fr}
  .rel-grid{grid-template-columns:1fr}
  .research{padding:40px 26px;border-radius:24px}
}
@media(max-width:600px){
  .walnut{width:min(270px,68%)}
  .hero-visual{min-height:300px}
  .aud-grid{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr 1fr}
  .seg{grid-template-columns:1fr;gap:10px}
  .pub{grid-template-columns:1fr;gap:8px}
  .metric-row{grid-template-columns:1fr 1fr}
  .study{padding:28px 22px}
  .study-facts{grid-template-columns:1fr 1fr;gap:16px}
  .stat-feature{align-items:flex-start}
  .stat-feature .ext{display:none}
}