/* ============================================================
   Ophthalmology Radar — Blog ("The Signal") shared stylesheet
   Reuses the v12 / about design tokens. Root-absolute asset paths.
   ============================================================ */
:root{
  --accent:#17C1DD;--accent-2:#A8F4FF;--accent-deep:#0FA9C4;--accent-soft:rgba(23,193,221,.12);
  --ink:#0A1116;--ink-soft:#3A4650;--muted:#5E6A75;--line:#E4E8EE;
  --bg-0:#FAFBFD;--bg-1:#EDF1F6;
  --glass:rgba(255,255,255,.62);--glass-strong:rgba(255,255,255,.80);--glass-brd:rgba(255,255,255,.9);
  --shadow-sm:0 1px 2px rgba(16,30,45,.04),0 6px 18px rgba(16,30,45,.06);
  --shadow-md:0 2px 6px rgba(16,30,45,.05),0 18px 50px rgba(16,30,45,.12);
  --shadow-lg:0 4px 10px rgba(16,30,45,.06),0 44px 100px -34px rgba(16,30,45,.28);
  --r-pill:999px;--maxw:1180px;--readw:720px;--ease:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{font-family:'Inter',system-ui,-apple-system,sans-serif;color:var(--ink);
  background:radial-gradient(130% 90% at 50% -8%, #FFFFFF 0%, var(--bg-0) 46%, var(--bg-1) 100%);
  background-attachment:fixed;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;line-height:1.6}
#net{position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.5}

h1,h2,h3,h4{font-family:'Inter Tight','Inter',sans-serif;font-weight:800;letter-spacing:-.032em;line-height:1.06}
.grad{background:linear-gradient(102deg,#23C8E0 0%,#17C1DD 44%,#0C8197 100%);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;padding-bottom:.12em;margin-bottom:-.12em}
em.serif{font-family:'Cormorant Garamond',serif;font-style:italic;font-weight:600}
.eyebrow{font-family:'Inter Tight';font-weight:600;font-size:12px;letter-spacing:.34em;text-transform:uppercase;
  color:var(--accent-deep);display:inline-flex;align-items:center;gap:10px;margin-bottom:18px}
.eyebrow::before{content:"";width:22px;height:1.5px;background:var(--accent);opacity:.85;border-radius:2px}
.eyebrow.center{justify-content:center}.eyebrow.center::before{display:none}

.btn{font-family:inherit;font-size:14px;font-weight:600;cursor:pointer;border:none;padding:13px 24px;
  border-radius:var(--r-pill);text-decoration:none;display:inline-flex;align-items:center;gap:8px;white-space:nowrap;
  transition:transform .25s var(--ease),box-shadow .25s var(--ease),background .25s,color .25s,border-color .25s}
.btn-primary{color:#fff;background:linear-gradient(135deg,var(--accent) 0%,var(--accent-deep) 100%);
  box-shadow:0 1px 1px rgba(15,169,196,.4),0 10px 24px -8px rgba(23,193,221,.7)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 2px 2px rgba(15,169,196,.4),0 16px 34px -8px rgba(23,193,221,.8)}
.btn-ghost{color:var(--ink);background:var(--glass-strong);border:1px solid var(--line);box-shadow:var(--shadow-sm)}
.btn-ghost:hover{transform:translateY(-1px);border-color:#cfd6df}
.btn-lg{padding:16px 30px;font-size:15px}

/* ---- reading progress ---- */
.progress{position:fixed;top:0;left:0;height:3px;width:0;z-index:60;
  background:linear-gradient(90deg,var(--accent),var(--accent-deep))}

/* ---- nav ---- */
.nav{position:fixed;top:0;left:0;right:0;z-index:50;display:flex;align-items:center;justify-content:space-between;gap:24px;
  padding:14px clamp(20px,4vw,44px);background:rgba(250,251,253,.72);
  backdrop-filter:blur(22px) saturate(160%);-webkit-backdrop-filter:blur(22px) saturate(160%);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:11px;text-decoration:none;color:inherit}
.brand img{display:block;width:30px;height:30px}
.brand .wm{display:flex;flex-direction:column;line-height:1}
.brand .wm b{font-family:'Inter Tight';font-weight:700;font-size:15px;letter-spacing:-.01em}
.brand .wm span{font-size:9.5px;letter-spacing:.22em;text-transform:uppercase;color:var(--muted);margin-top:3px;font-weight:600}
.nav-links{position:absolute;left:50%;transform:translateX(-50%);display:flex;align-items:center;gap:4px}
.nav-links a{font-size:14px;font-weight:500;color:var(--ink-soft);text-decoration:none;padding:9px 14px;border-radius:var(--r-pill);transition:color .2s,background .2s}
.nav-links a:hover{color:var(--ink);background:rgba(10,17,22,.05)}
.nav-links a.on{color:var(--ink);background:rgba(23,193,221,.10)}
.nav-right{display:flex;align-items:center;gap:10px}
.lang{display:flex;align-items:center;gap:8px;font-size:11px;font-weight:600;letter-spacing:.14em;margin-right:6px}
.lang a{color:rgba(10,17,22,.36);text-decoration:none;transition:color .3s var(--ease)}
.lang a:hover{color:var(--accent-deep)}
.lang a.on{color:var(--ink);pointer-events:none}
.lang i{width:1px;height:11px;background:rgba(10,17,22,.16)}
.nav-burger{display:none;width:42px;height:42px;border-radius:50%;background:var(--glass-strong);border:1px solid var(--line);cursor:pointer;align-items:center;justify-content:center}
.nav-burger svg{width:20px;height:20px}

main{position:relative;z-index:1}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 clamp(22px,5vw,44px)}
.narrow{max-width:calc(var(--readw) + 88px)}

/* reveal primitive */
.rv{opacity:0;transform:translateY(24px);transition:opacity .8s var(--ease),transform .8s var(--ease);transition-delay:calc(var(--i,0)*80ms)}
.rv.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.rv{opacity:1!important;transform:none!important;transition:none}}

/* =========================================================
   QUIZ BANNER — the "Is Ophthalmology Radar right for you?" strip
   ========================================================= */
.quiz-banner{display:flex;align-items:center;justify-content:space-between;gap:26px;
  background:linear-gradient(118deg,rgba(23,193,221,.13),rgba(168,244,255,.10) 60%,rgba(255,255,255,.5));
  border:1px solid rgba(23,193,221,.30);border-radius:22px;padding:22px clamp(20px,3vw,30px);
  box-shadow:var(--shadow-sm);position:relative;overflow:hidden}
.quiz-banner::before{content:"";position:absolute;right:-40px;top:50%;transform:translateY(-50%);
  width:200px;height:200px;border-radius:50%;background:radial-gradient(circle,rgba(23,193,221,.16),transparent 70%);pointer-events:none}
.quiz-banner .qb-tx{position:relative;z-index:1}
.quiz-banner h3{font-size:clamp(18px,2.2vw,21px);letter-spacing:-.02em;margin-bottom:6px}
.quiz-banner p{font-size:14.5px;color:var(--ink-soft);max-width:660px;line-height:1.5;font-weight:400}
.quiz-banner .btn{flex:0 0 auto;position:relative;z-index:1}

/* =========================================================
   BLOG INDEX
   ========================================================= */
.blog-hero{padding:calc(64px + clamp(40px,8vh,88px)) 0 24px;text-align:center}
.blog-hero h1{font-size:clamp(2.5rem,6vw,4rem);margin:6px 0 16px}
.blog-hero .sub{font-size:clamp(1.05rem,1.7vw,1.28rem);color:var(--muted);max-width:620px;margin:0 auto;line-height:1.6}

.filters{display:flex;flex-wrap:wrap;gap:9px;justify-content:center;margin:34px 0 6px}
.filters button{font-family:'Inter Tight';font-weight:600;font-size:13.5px;color:var(--ink-soft);
  background:var(--glass-strong);border:1px solid var(--line);padding:9px 18px;border-radius:var(--r-pill);cursor:pointer;
  transition:all .2s var(--ease)}
.filters button:hover{border-color:#cfd6df}
.filters button.on{color:#fff;background:linear-gradient(135deg,var(--accent),var(--accent-deep));border-color:transparent;
  box-shadow:0 8px 18px -8px rgba(23,193,221,.7)}

.tag{display:inline-block;font-family:'Inter Tight';font-weight:700;font-size:10.5px;letter-spacing:.13em;text-transform:uppercase;
  color:var(--accent-deep);background:var(--accent-soft);padding:5px 11px;border-radius:var(--r-pill)}

/* featured */
.featured{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(24px,4vw,52px);align-items:center;
  margin:40px 0 8px;padding:clamp(20px,3vw,30px);border-radius:26px;background:var(--glass-strong);
  border:1px solid var(--glass-brd);box-shadow:var(--shadow-md);text-decoration:none;color:inherit;
  transition:transform .35s var(--ease),box-shadow .35s var(--ease)}
.featured:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.featured .fimg{position:relative;border-radius:18px;overflow:hidden;aspect-ratio:16/11;background:#e7edf2;order:2}
.featured .fimg img{width:100%;height:100%;object-fit:cover;transition:transform .6s var(--ease)}
.featured:hover .fimg img{transform:scale(1.04)}
.featured .ftx{order:1}
.featured .ftx h2{font-size:clamp(1.55rem,2.9vw,2.15rem);margin:14px 0 12px;letter-spacing:-.03em}
.featured .ftx p{color:var(--muted);font-size:15.5px;line-height:1.6;margin-bottom:18px}
.featured .meta{display:flex;align-items:center;gap:9px;font-size:13px;color:var(--muted)}
.read-more{display:inline-flex;align-items:center;gap:7px;color:var(--accent-deep);font-weight:600;font-size:14px}
.read-more svg{width:15px;height:15px;transition:transform .3s var(--ease)}
.featured:hover .read-more svg,.card:hover .read-more svg{transform:translateX(4px)}

/* card grid */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(20px,2.4vw,30px);margin:34px 0 10px}
.card{display:flex;flex-direction:column;text-decoration:none;color:inherit;border-radius:20px;overflow:hidden;
  background:var(--glass-strong);border:1px solid var(--glass-brd);box-shadow:var(--shadow-sm);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease)}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.card .cimg{position:relative;aspect-ratio:16/10;overflow:hidden;background:#e7edf2}
.card .cimg img{width:100%;height:100%;object-fit:cover;transition:transform .6s var(--ease)}
.card:hover .cimg img{transform:scale(1.05)}
.card .cbody{padding:20px 22px 22px;display:flex;flex-direction:column;flex:1}
.card h3{font-size:1.16rem;letter-spacing:-.02em;margin:12px 0 9px;line-height:1.22}
.card p{color:var(--muted);font-size:14px;line-height:1.55;flex:1}
.card .meta{margin-top:16px;font-size:12.5px;color:var(--muted);display:flex;align-items:center;gap:8px}
.card .read-more{margin-top:14px}

/* =========================================================
   ARTICLE
   ========================================================= */
.article{padding-top:calc(64px + 26px)}
.crumbs{font-size:13.5px;color:var(--muted);margin-bottom:22px;display:flex;gap:8px;align-items:center}
.crumbs a{color:var(--accent-deep);text-decoration:none;font-weight:600}
.crumbs a:hover{text-decoration:underline}
.crumbs span{color:var(--line)}
.article h1{font-size:clamp(2rem,4.4vw,3rem);letter-spacing:-.035em;line-height:1.05;margin-bottom:22px}
.byline{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:14px;
  padding-bottom:26px;border-bottom:1px solid var(--line);margin-bottom:30px}
.byline .who{font-size:14px;color:var(--muted)}
.byline .who b{color:var(--ink);font-weight:600}
.byline .who .upd{text-transform:uppercase;font-size:11px;letter-spacing:.08em;color:#9aa4ad;margin:0 4px}
.share{display:flex;gap:10px}
.share a{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  background:var(--ink);color:#fff;transition:transform .25s var(--ease),background .25s}
.share a:hover{transform:translateY(-2px);background:var(--accent-deep)}
.share a svg{width:16px;height:16px}

.hero-img{border-radius:22px;overflow:hidden;margin-bottom:38px;aspect-ratio:16/9;background:#e7edf2;box-shadow:var(--shadow-md)}
.hero-img img{width:100%;height:100%;object-fit:cover}

.prose{font-size:17px;line-height:1.72;color:var(--ink-soft)}
.prose>*+*{margin-top:22px}
.prose h2{font-size:1.62rem;color:var(--ink);letter-spacing:-.02em;margin-top:44px;line-height:1.2}
.prose h3{font-size:1.24rem;color:var(--ink);letter-spacing:-.01em;margin-top:32px}
.prose p{margin-top:20px}
.prose strong{color:var(--ink);font-weight:600}
.prose a{color:var(--accent-deep);text-decoration:underline;text-underline-offset:2px}
.prose ul,.prose ol{padding-left:22px;margin-top:18px}
.prose li{margin:9px 0}
.prose li::marker{color:var(--accent-deep)}
.prose blockquote{margin:34px 0;padding:6px 0 6px 26px;border-left:3px solid var(--accent);
  font-family:'Cormorant Garamond',serif;font-style:italic;font-weight:600;font-size:1.5rem;line-height:1.4;color:var(--ink)}
.prose figure{margin:34px 0}
.prose figure img{width:100%;border-radius:16px;display:block;box-shadow:var(--shadow-sm)}
.prose figcaption{font-size:13px;color:var(--muted);margin-top:10px;text-align:center}
.stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:34px 0}
.stat-row .s{background:var(--glass-strong);border:1px solid var(--glass-brd);border-radius:16px;padding:22px 20px;text-align:center;box-shadow:var(--shadow-sm)}
.stat-row .s b{display:block;font-family:'Inter Tight';font-weight:800;font-size:2rem;
  background:linear-gradient(135deg,var(--accent),var(--accent-deep));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.stat-row .s span{font-size:13px;color:var(--muted);display:block;margin-top:6px}

/* inline mid-article CTA + bottom CTA card */
.cta-card{margin:46px 0;border-radius:22px;padding:clamp(26px,4vw,40px);text-align:center;position:relative;overflow:hidden;
  background:linear-gradient(140deg,#0B2830,#0A1116);color:#fff;box-shadow:var(--shadow-lg)}
.cta-card::before{content:"";position:absolute;inset:0;background:radial-gradient(80% 120% at 80% -10%,rgba(23,193,221,.34),transparent 60%);pointer-events:none}
.cta-card .eyebrow{color:var(--accent-2)}
.cta-card h3{font-size:clamp(1.5rem,3vw,2rem);margin-bottom:12px;position:relative;color:#fff}
.cta-card p{color:rgba(255,255,255,.72);max-width:520px;margin:0 auto 24px;position:relative;font-size:15px}
.cta-card .btn{text-decoration:none}
.cta-card .btn-primary{color:#fff}
.cta-card .btn-ghost{background:rgba(255,255,255,.08);color:#fff;border-color:rgba(255,255,255,.2)}
.cta-card .btn-ghost:hover{background:rgba(255,255,255,.14)}
.cta-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;position:relative}

.author-box{display:flex;gap:16px;align-items:center;margin:46px 0 10px;padding:22px;border-radius:18px;
  background:var(--glass-strong);border:1px solid var(--glass-brd);box-shadow:var(--shadow-sm)}
.author-box img{width:54px;height:54px;border-radius:50%;object-fit:cover;flex:0 0 auto}
.author-box b{font-family:'Inter Tight';font-weight:700;font-size:15px}
.author-box p{font-size:13.5px;color:var(--muted);margin-top:3px}

.related{margin-top:60px}
.related h2{font-size:1.5rem;margin-bottom:24px}

/* ---- footer ---- */
footer{border-top:1px solid var(--line);padding:44px 0 56px;position:relative;z-index:1;margin-top:70px}
.foot{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}
.foot .brand .wm b{font-size:14px}
.foot-right{display:flex;align-items:center;gap:22px;flex-wrap:wrap}
.foot-right a{font-size:13px;color:var(--muted);text-decoration:none;font-weight:500}
.foot-right a:hover{color:var(--ink)}
.foot-copy{margin-top:22px;font-size:12px;color:var(--muted)}

/* ---- mobile sheet ---- */
.sheet{position:fixed;inset:0;z-index:80;background:rgba(248,250,253,.94);backdrop-filter:blur(18px);
  display:flex;flex-direction:column;padding:90px 28px 28px;opacity:0;pointer-events:none;transition:opacity .35s var(--ease)}
.sheet.open{opacity:1;pointer-events:auto}
.sheet a{font-size:23px;font-weight:600;color:var(--ink);text-decoration:none;padding:16px 0;border-bottom:1px solid var(--line)}
.sheet .btn{margin-top:24px;justify-content:center;padding:16px}
.sheet-close{position:absolute;top:20px;right:20px;width:44px;height:44px;border-radius:50%;border:1px solid var(--line);
  background:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center}

/* ---- responsive ---- */
@media (max-width:900px){
  .featured{grid-template-columns:1fr;gap:22px}.featured .fimg{order:1}.featured .ftx{order:2}
  .grid{grid-template-columns:repeat(2,1fr)}
  .quiz-banner{flex-direction:column;align-items:flex-start;gap:16px}
  .quiz-banner .btn{width:100%;justify-content:center}
}
@media (max-width:880px){
  .nav-links{display:none}.nav-right .btn-ghost,.nav-right .btn-primary{display:none}
  .nav-burger{display:flex}.brand .wm span{display:none}
}
@media (max-width:600px){
  .grid{grid-template-columns:1fr}
  .stat-row{grid-template-columns:1fr}
  .byline{gap:16px}
  .prose{font-size:16px}
}