*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

:root{
  --bg:#f7f6f2;--surface:#fff;--surface2:#edecea;
  --border:rgba(0,0,0,.09);--text:#111110;--muted:#706f6a;
  --accent:#1d4ed8;--accent-light:#eff6ff;
  --tag-bg:#ececea;--tag-text:#3a3935;
  --green:#16a34a;--green-bg:#dcfce7;--green-text:#15803d;
  --radius:14px;--ease:.5s cubic-bezier(.4,0,.2,1);
}
body.dark{
  --bg:#0e0e0d;--surface:#1a1917;--surface2:#222120;
  --border:rgba(255,255,255,.07);--text:#edece8;--muted:#888780;
  --accent:#60a5fa;--accent-light:#172033;
  --tag-bg:#232220;--tag-text:#c2c0b8;
  --green-bg:#14532d;--green-text:#4ade80;
}

html{font-size:16px;scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:'Inter',sans-serif;
  background:var(--bg);color:var(--text);
  min-height:100vh;overflow-x:hidden;
  transition:background var(--ease),color var(--ease);
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}

.wrap{max-width:900px;margin:0 auto;padding:32px 18px 80px}

.top-bar{
  display:flex;align-items:flex-start;
  justify-content:space-between;
  margin-bottom:28px;gap:12px;
}
.back-link{
  font-size:12.5px;font-weight:600;color:var(--muted);
  display:inline-flex;align-items:center;gap:4px;
  transition:color .2s;margin-bottom:6px;
}
.back-link:hover{color:var(--accent);text-decoration:none}
.page-title{font-size:clamp(20px,4vw,28px);font-weight:800;letter-spacing:-.5px}
.page-sub{font-size:13px;color:var(--muted);margin-top:4px;font-weight:500}

.theme-toggle{
  width:36px;height:36px;border-radius:50%;
  background:var(--surface2);border:.5px solid var(--border);
  display:flex;align-items:center;justify-content:center;
  cursor:pointer;font-size:15px;flex-shrink:0;
  transition:background .3s,transform .2s;
}
.theme-toggle:hover{transform:scale(1.08);background:var(--surface)}

.stats-row{display:flex;gap:10px;margin-bottom:20px;flex-wrap:wrap}
.stat-chip{
  background:var(--surface);border:.5px solid var(--border);
  border-radius:10px;padding:12px 16px;
  display:flex;align-items:center;gap:10px;
  transition:background var(--ease),border-color var(--ease);
}
.stat-chip .s-num{font-size:22px;font-weight:800;color:var(--accent);letter-spacing:-1px;line-height:1}
.stat-chip .s-lbl{font-size:11px;color:var(--muted);font-weight:500;line-height:1.4}

.filter-bar{
  display:flex;gap:6px;margin-bottom:20px;
  overflow-x:auto;flex-wrap:nowrap;
  scrollbar-width:none;padding-bottom:2px;
}
.filter-bar::-webkit-scrollbar{display:none}
.filter-btn{
  background:var(--surface2);border:.5px solid var(--border);
  border-radius:8px;padding:6px 14px;font-size:12px;font-weight:600;
  color:var(--muted);cursor:pointer;font-family:inherit;
  white-space:nowrap;flex-shrink:0;
  transition:background var(--ease),color var(--ease),border-color var(--ease);
}
.filter-btn.active{background:var(--accent-light);color:var(--accent);border-color:var(--accent)}

.cert-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(min(100%,260px),1fr));
  gap:12px;
}

.cert-card{
  background:var(--surface);border:.5px solid var(--border);
  border-radius:var(--radius);overflow:hidden;
  cursor:pointer;
  transition:border-color .2s,transform .18s,box-shadow .18s,background var(--ease);
  animation:fadeUp .35s ease both;
}
.cert-card:hover{
  border-color:var(--accent);
  transform:translateY(-2px);
  box-shadow:0 8px 24px rgba(0,0,0,.08);
}
body.dark .cert-card:hover{box-shadow:0 8px 24px rgba(0,0,0,.35)}

.cert-thumb{
  position:relative;background:var(--surface2);
  aspect-ratio:4/3;overflow:hidden;
  display:flex;align-items:center;justify-content:center;
}
.cert-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.cert-card:hover .cert-thumb img{transform:scale(1.03)}

.cert-thumb-ph{
  width:100%;height:100%;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:8px;color:var(--muted);font-size:12px;padding:16px;text-align:center;
}
.cert-thumb-ph .ph-icon{font-size:32px;margin-bottom:4px}
.cert-thumb-ph code{
  font-family:'DM Mono',monospace;font-size:10px;
  background:var(--tag-bg);padding:2px 7px;border-radius:4px;color:var(--accent);
}

.cert-thumb::after{
  content:'🔍 View';
  position:absolute;inset:0;
  background:rgba(0,0,0,.45);
  color:#fff;font-size:12px;font-weight:700;
  display:flex;align-items:center;justify-content:center;
  opacity:0;transition:opacity .2s;
}
.cert-card:hover .cert-thumb::after{opacity:1}

.cert-badge{
  position:absolute;top:8px;left:8px;
  font-size:10px;font-weight:700;
  padding:3px 8px;border-radius:5px;
  font-family:'DM Mono',monospace;
  backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);
}
.badge-cisco      {background:rgba(0,74,173,.85);color:#fff}
.badge-google     {background:rgba(66,133,244,.85);color:#fff}
.badge-freecodecamp{background:rgba(0,100,0,.85);color:#fff}
.badge-cs50       {background:rgba(163,0,0,.85);color:#fff}
.badge-coursera   {background:rgba(0,86,179,.85);color:#fff}
.badge-other      {background:rgba(80,80,80,.75);color:#fff}
.badge-udemy      {background:rgba(162,89,255,.85);color:#fff}
.badge-anthropic {background: rgba(204, 102, 51, .85);color: #fff;}

.cert-body{padding:14px}
.cert-body h3{font-size:13.5px;font-weight:700;margin-bottom:4px;line-height:1.4}
.cert-body .issuer{font-size:12px;color:var(--muted);font-weight:500;margin-bottom:8px}
.cert-meta{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:6px}
.cert-year{
  font-size:10px;background:var(--tag-bg);color:var(--muted);
  border-radius:5px;padding:2px 8px;font-family:'DM Mono',monospace;
  transition:background var(--ease),color var(--ease);
}
.cert-credential{
  font-size:10.5px;font-weight:600;color:var(--accent);
  display:inline-flex;align-items:center;gap:3px;
}
.cert-credential:hover{text-decoration:underline}

.cert-card.hidden{display:none}

.no-results{
  grid-column:1/-1;text-align:center;
  color:var(--muted);font-size:13px;padding:40px 0;
}

.lb-overlay{
  position:fixed;inset:0;z-index:1000;
  background:rgba(0,0,0,.88);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:14px;padding:20px;
  opacity:0;pointer-events:none;transition:opacity .3s;
}
.lb-overlay.open{opacity:1;pointer-events:auto}

.lb-img-wrap{
  position:relative;max-width:min(800px,90vw);
  display:flex;align-items:center;justify-content:center;gap:12px;
}
.lb-img-wrap img{
  max-width:min(720px,80vw);max-height:75vh;
  border-radius:12px;object-fit:contain;
  box-shadow:0 24px 64px rgba(0,0,0,.5);
}

.lb-ph{
  width:min(500px,80vw);height:min(375px,60vw);
  background:var(--surface2);border-radius:12px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:10px;color:var(--muted);font-size:13px;text-align:center;padding:30px;
}
.lb-ph .lph-icon{font-size:40px;margin-bottom:8px}
.lb-ph code{
  font-family:'DM Mono',monospace;font-size:11px;
  background:var(--tag-bg);padding:3px 9px;border-radius:5px;color:var(--accent);
}

.lb-nav{
  position:absolute;top:50%;transform:translateY(-50%);
  width:40px;height:40px;border-radius:50%;
  background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);
  color:#fff;font-size:18px;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  transition:background .18s;flex-shrink:0;
}
.lb-nav:hover{background:rgba(255,255,255,.22)}
.lb-nav.lb-prev{left:-52px}
.lb-nav.lb-next{right:-52px}

.lb-meta{color:#fff;text-align:center}
.lb-meta h3{font-size:15px;font-weight:700;margin-bottom:2px}
.lb-meta p{font-size:12px;color:rgba(255,255,255,.6)}

.lb-counter{font-size:11px;color:rgba(255,255,255,.45);letter-spacing:.05em}
.lb-close-hint{font-size:11px;color:rgba(255,255,255,.35)}

.lb-close-btn{
  position:fixed;top:16px;right:16px;
  width:32px;height:32px;border-radius:50%;
  background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);
  color:#fff;font-size:14px;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  transition:background .18s;
}
.lb-close-btn:hover{background:rgba(255,255,255,.25)}

footer{
  text-align:center;font-size:12px;color:var(--muted);
  margin-top:40px;padding-top:20px;border-top:.5px solid var(--border);
  line-height:1.6;font-weight:500;
  transition:color var(--ease),border-color var(--ease);
}

@keyframes fadeUp{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}

@media(max-width:600px){
  .wrap{
    padding:18px 13px 80px;
    padding-left:max(13px,env(safe-area-inset-left));
    padding-right:max(13px,env(safe-area-inset-right));
    padding-bottom:max(80px,calc(60px + env(safe-area-inset-bottom)));
  }
  .top-bar{gap:8px;align-items:flex-start}
  .page-title{font-size:20px}
  .stats-row{gap:7px;flex-wrap:wrap}
  .stat-chip{flex:1 1 calc(50% - 4px);min-width:0;padding:10px 12px}
  .stat-chip .s-num{font-size:18px}
  .filter-btn{font-size:11px;padding:5px 10px}
  .cert-grid{grid-template-columns:1fr}
  .cert-thumb{aspect-ratio:3/2}
  .lb-img-wrap img{max-width:88vw;max-height:55vh}
  .lb-nav.lb-prev{left:-38px}
  .lb-nav.lb-next{right:-38px}
  .lb-nav{width:34px;height:34px;font-size:16px}
}
@media(max-width:420px){
  .lb-nav.lb-prev{left:-4px}
  .lb-nav.lb-next{right:-4px}
  .lb-img-wrap img{max-width:76vw}
  .stat-chip{flex:1 1 100%}
}
@media(prefers-reduced-motion:reduce){
  .cert-card{animation:none}
  *{transition-duration:.01ms!important}
}