:root{
  --bg:#0b1020;
  --ink:#f3efe6;
  --soft:#aab1c5;
  --gold:#d4af37;
  --wood-1:#6a4527;
  --wood-2:#3b2514;
  --paper:#f8f7f3;
  --paper-ink:#101322;
  --paper-soft:#4a5164;
  --line:#e2e0d6;
  --font-display:'Fraunces', Georgia, serif;
  --font-body:'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

*,*::before,*::after{box-sizing:border-box;}
[hidden]{display:none !important;}
html{scroll-behavior:smooth;}
body{
  margin:0;min-height:100vh;
  background:radial-gradient(1100px 560px at 75% -8%, #1b2750 0%, transparent 62%), var(--bg);
  color:var(--ink);font-family:var(--font-body);line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none;}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px;}

/* Header */
.top{padding:22px 0;}
.top-inner{display:flex;align-items:center;justify-content:space-between;}
.back{font-size:14px;color:var(--soft);transition:color .2s ease;}
.back:hover{color:var(--ink);}
.mark{
  font-family:var(--font-display);font-weight:600;font-size:18px;color:var(--ink);
  border:2px solid var(--ink);width:38px;height:38px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
}

/* Intro */
.intro{padding-top:36px;}
.eyebrow{
  text-transform:uppercase;letter-spacing:.14em;font-size:13px;font-weight:600;
  color:var(--gold);margin:0 0 14px;
}
h1{
  font-family:var(--font-display);font-weight:600;line-height:1.12;margin:0 0 14px;
  font-size:clamp(30px,5vw,52px);max-width:760px;
}
.lede{color:var(--soft);font-size:17px;margin:0 0 28px;}
.tools{display:flex;align-items:center;gap:14px;flex-wrap:wrap;}
#search{
  background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);color:var(--ink);
  border-radius:999px;padding:11px 18px;font:inherit;font-size:14px;min-width:260px;
}
#search::placeholder{color:#8088a0;}
#search:focus{outline:2px solid var(--gold);outline-offset:2px;}
.chips{display:flex;gap:8px;flex-wrap:wrap;}
.chips-wrap{flex:1 1 100%;display:flex;align-items:flex-start;gap:10px;}
.chips-wrap .chips{flex:1;min-width:0;max-height:42px;overflow:hidden;padding:2px 2px 0;margin:-2px -2px 0;}
.chips-wrap.is-open .chips{max-height:138px;overflow-y:auto;padding-bottom:2px;}
.chips-wrap.measuring .chips{max-height:none;overflow:visible;}
.chip-more{flex:none;color:var(--gold);border-color:rgba(212,175,55,.5);white-space:nowrap;}
.chip-more:hover{color:var(--paper-ink);}
.chip{
  background:transparent;color:var(--soft);border:1px solid rgba(255,255,255,.18);
  border-radius:999px;padding:8px 14px;font:inherit;font-size:13px;font-weight:500;cursor:pointer;
  transition:all .2s ease;
}
.chip:hover{color:var(--ink);border-color:var(--ink);}
.chip[aria-pressed="true"]{background:var(--gold);border-color:var(--gold);color:var(--paper-ink);}
.chips.kinds{padding-right:14px;margin-right:2px;border-right:1px solid rgba(255,255,255,.14);}
.chips.kinds:empty{display:none;}
.count{color:var(--soft);font-size:13px;margin-left:auto;}

/* Shelf */
#shelf{margin-top:48px;padding-bottom:96px;}
.row{margin-bottom:38px;}
.spines{display:flex;align-items:flex-end;gap:6px;padding:0 26px;}
.board{
  height:16px;border-radius:4px;
  background:linear-gradient(var(--wood-1),var(--wood-2));
  box-shadow:0 16px 26px rgba(0,0,0,.5), inset 0 2px 0 rgba(255,255,255,.14);
}
.book{
  all:unset;box-sizing:border-box;cursor:pointer;flex:none;
  display:flex;flex-direction:column;align-items:center;justify-content:space-between;
  padding:12px 0 10px;border-radius:3px 3px 2px 2px;
  box-shadow:inset -3px 0 0 rgba(0,0,0,.25), inset 2px 0 0 rgba(255,255,255,.14), 0 2px 5px rgba(0,0,0,.45);
  transition:transform .28s cubic-bezier(.2,.8,.2,1), box-shadow .28s ease;
}
.book:hover,.book:focus-visible{
  transform:translateY(-14px) rotate(-1.4deg);
  box-shadow:inset -3px 0 0 rgba(0,0,0,.25), inset 2px 0 0 rgba(255,255,255,.14), 0 14px 18px rgba(0,0,0,.5);
}
.book:focus-visible{outline:2px solid var(--gold);outline-offset:3px;}
.book .band{width:60%;height:3px;border-radius:2px;background:currentColor;opacity:.55;}
.book .t{
  writing-mode:vertical-rl;font-family:var(--font-display);font-weight:500;font-size:13px;line-height:1.15;
  letter-spacing:.02em;text-align:center;overflow:hidden;
  flex:1;min-height:0;max-width:2.4em;margin:10px 0;
}
/* Tape vault */
.shelf-label{
  display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;margin:8px 0 26px;
  font-family:var(--font-display);font-weight:600;font-size:22px;letter-spacing:.01em;
}
.shelf-label span{font-family:var(--font-body,inherit);font-weight:400;font-size:13px;color:var(--soft);}
.shelf-label::before{content:'';flex:none;width:28px;height:2px;background:var(--gold);align-self:center;}
.wall-all{
  margin-left:auto;align-self:center;cursor:pointer;font:inherit;font-family:var(--font-body,inherit);font-size:13px;font-weight:600;letter-spacing:.02em;
  color:var(--gold);background:transparent;border:1px solid rgba(212,175,55,.5);border-radius:999px;padding:6px 14px;white-space:nowrap;
}
.wall-all:hover,.wall-all:focus-visible{color:var(--paper-ink);background:var(--gold);border-color:var(--gold);outline:none;}
.tape{
  all:unset;box-sizing:border-box;cursor:pointer;flex:none;
  display:flex;flex-direction:column;align-items:center;justify-content:space-between;
  padding:0 0 8px;border-radius:2px;overflow:hidden;
  background:linear-gradient(90deg,#0b0c11 0%,#1d202b 45%,#0b0c11 100%);
  box-shadow:inset -3px 0 0 rgba(0,0,0,.35), inset 2px 0 0 rgba(255,255,255,.1), 0 2px 5px rgba(0,0,0,.5);
  transition:transform .28s cubic-bezier(.2,.8,.2,1), box-shadow .28s ease;
}
.tape:hover,.tape:focus-visible{
  transform:translateY(-14px) rotate(-1.4deg);
  box-shadow:inset -3px 0 0 rgba(0,0,0,.35), inset 2px 0 0 rgba(255,255,255,.1), 0 14px 18px rgba(0,0,0,.5);
}
.tape:focus-visible{outline:2px solid var(--gold);outline-offset:3px;}
.tape .stripe{width:100%;height:7px;background:var(--accent);flex:none;}
.tape .label{
  flex:1;min-height:0;width:28px;margin:8px 0 7px;border-radius:2px;
  background:#f1e8d0;color:#23211a;display:flex;justify-content:center;align-items:flex-start;
  padding:7px 0;overflow:hidden;box-shadow:inset 0 0 0 1px rgba(0,0,0,.12);
}
.tape .t{
  writing-mode:vertical-rl;font-family:'Caveat',cursive;font-weight:600;font-size:17px;
  text-align:start;overflow:hidden;max-height:100%;line-height:1.1;
}
.tape .reels{display:flex;gap:5px;flex:none;}
.tape .reels i{width:7px;height:7px;border-radius:50%;background:#2c3040;box-shadow:inset 0 0 0 1.5px #4a5068;}
.empty{
  border:1px dashed rgba(255,255,255,.22);border-radius:14px;padding:44px 24px;text-align:center;color:var(--soft);
}

/* Detail sheet */
#overlay{
  position:fixed;inset:0;z-index:50;display:grid;place-items:center;padding:20px;
  background:rgba(5,8,18,.72);backdrop-filter:blur(6px);
  animation:fade .2s ease;
}
.sheet{
  position:relative;width:min(920px,100%);max-height:90vh;overflow:auto;
  display:grid;grid-template-columns:250px 1fr;
  background:var(--paper);color:var(--paper-ink);border-radius:18px;
  box-shadow:0 30px 80px rgba(0,0,0,.55);
  animation:rise .32s cubic-bezier(.2,.8,.2,1);
}
.close{
  position:absolute;top:10px;right:14px;z-index:2;width:36px;height:36px;border-radius:50%;
  border:none;background:rgba(16,19,34,.08);color:var(--paper-ink);font-size:22px;line-height:1;cursor:pointer;
}
.close:hover{background:rgba(16,19,34,.16);}
.cover{
  padding:28px;display:flex;flex-direction:column;justify-content:space-between;gap:28px;min-height:340px;
  background:var(--c-bg);color:var(--c-fg);
}
.cover-kicker{font-size:12px;letter-spacing:.12em;text-transform:uppercase;opacity:.75;margin:0;font-weight:600;}
.cover h2{font-family:var(--font-display);font-weight:600;font-size:26px;line-height:1.15;margin:0 0 10px;}
.cover-sub{margin:0 0 12px;font-size:14px;line-height:1.4;opacity:.85;}
.cover-author{margin:0;font-size:14px;opacity:.85;font-weight:600;}
.content{padding:34px 36px 38px;}
.content h3{
  text-transform:uppercase;letter-spacing:.12em;font-size:12px;font-weight:700;color:#9a7b1f;margin:0 0 12px;
}
.block{margin-bottom:28px;}
.block:last-child{margin-bottom:0;}
.stickies{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:22px 18px;padding:10px 4px 6px;
}
.sticky{
  position:relative;background:var(--note,#fff3a0);color:#2b2a26;
  font-family:'Caveat','Bradley Hand','Segoe Print',cursive;font-size:23px;line-height:1.18;font-weight:500;
  padding:26px 18px 20px;min-height:132px;
  border-radius:2px 2px 16px 2px;
  box-shadow:0 1px 1px rgba(0,0,0,.08), 0 12px 18px -8px rgba(0,0,0,.35);
  transform:rotate(var(--tilt,0deg));
  transition:transform .25s ease, box-shadow .25s ease;
  animation:stick .5s cubic-bezier(.2,.8,.2,1) backwards;
}
.sticky::before{
  content:'';position:absolute;top:-10px;left:50%;width:58px;height:20px;
  background:rgba(255,255,255,.6);box-shadow:0 1px 3px rgba(0,0,0,.15);
  transform:translateX(-50%) rotate(-2deg);
}
.sticky:hover{
  transform:rotate(0deg) translateY(-5px) scale(1.03);
  box-shadow:0 2px 2px rgba(0,0,0,.08), 0 18px 24px -8px rgba(0,0,0,.4);
}
.ideas{display:flex;gap:8px;flex-wrap:wrap;}
.idea{
  font-size:13px;font-weight:600;color:#1e2c4d;background:#ecebe3;border-radius:999px;padding:6px 12px;
}
.links{display:grid;gap:10px;}
.link{
  all:unset;box-sizing:border-box;cursor:pointer;display:block;
  border:1px solid var(--line);border-radius:12px;padding:12px 14px;background:#fff;
  transition:border-color .2s ease, transform .2s ease;
}
.link:hover,.link:focus-visible{border-color:#b8912f;transform:translateX(3px);}
.link:focus-visible{outline:2px solid #b8912f;outline-offset:2px;}
.link strong{display:block;font-family:var(--font-display);font-size:16px;color:var(--paper-ink);}
.link span{display:block;font-size:14px;color:var(--paper-soft);margin-top:2px;}
.soon{color:var(--paper-soft);font-size:15px;margin:0;}

.ribbon{
  position:fixed;left:16px;bottom:16px;z-index:60;background:var(--gold);color:var(--paper-ink);
  font-size:12px;font-weight:700;padding:8px 12px;border-radius:8px;
}

@keyframes fade{from{opacity:0}to{opacity:1}}
@keyframes stick{
  from{opacity:0;transform:translateY(-16px) rotate(calc(var(--tilt,0deg) * 3)) scale(1.1);}
  to{opacity:1;transform:rotate(var(--tilt,0deg));}
}
@keyframes rise{from{opacity:0;transform:translateY(18px) scale(.98)}to{opacity:1;transform:none}}

@media (max-width:720px){
  .count{margin-left:0;}
  #search{min-width:0;width:100%;}
  #overlay{align-items:end;padding:0;}
  .sheet{grid-template-columns:1fr;max-height:92vh;border-radius:18px 18px 0 0;}
  .cover{min-height:0;padding:22px 24px 24px;}
  .cover h2{font-size:22px;}
  .content{padding:24px;}
}

@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important;}
}

/* Tape detail */
.cover.is-tape{box-shadow:inset 0 8px 0 var(--c-accent);}
.cover.is-tape h2{font-family:'Caveat',cursive;font-size:34px;line-height:1.05;}
.watch{
  display:inline-flex;align-items:center;gap:6px;padding:11px 22px;border-radius:999px;
  background:var(--gold);color:var(--paper-ink);font-weight:700;font-size:15px;text-decoration:none;
  transition:transform .2s ease,box-shadow .2s ease;
}
.watch:hover{transform:translateY(-2px);box-shadow:0 8px 18px rgba(0,0,0,.25);}
.watch:focus-visible{outline:2px solid var(--paper-ink);outline-offset:3px;}

/* The Wall: framed certificates */
.wall{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:40px 30px;
  padding:44px 34px 38px;margin-bottom:38px;border-radius:14px;
  background:
    radial-gradient(600px 220px at 50% 0%, rgba(255,235,190,.07), transparent 70%),
    repeating-linear-gradient(90deg, rgba(255,255,255,.012) 0 2px, transparent 2px 6px),
    #151a2c;
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.06), inset 0 -18px 30px rgba(0,0,0,.25);
}
.frame{
  all:unset;box-sizing:border-box;cursor:pointer;position:relative;display:flex;flex-direction:column;align-items:center;gap:12px;
  transform:rotate(var(--tilt,0deg));transform-origin:50% 8px;
  transition:transform .3s cubic-bezier(.2,.8,.2,1), filter .3s ease;
}
.frame::before{
  content:'';position:absolute;top:-14px;left:50%;width:9px;height:9px;margin-left:-4.5px;border-radius:50%;
  background:radial-gradient(circle at 35% 35%,#e8d48a,#8a6d1f);box-shadow:0 2px 3px rgba(0,0,0,.5);
}
.frame:hover,.frame:focus-visible{transform:rotate(0deg) translateY(-6px);filter:drop-shadow(0 16px 18px rgba(0,0,0,.5));}
.frame:focus-visible{outline:2px solid var(--gold);outline-offset:6px;}
.mat{
  width:100%;aspect-ratio:1/1;display:grid;place-items:center;padding:14px;
  background:#f4efe3;border:9px solid #4a3220;border-radius:3px;
  box-shadow:inset 0 0 0 2px #d9c9a3, inset 0 0 14px rgba(0,0,0,.18), 0 8px 16px rgba(0,0,0,.45);
  background-image:linear-gradient(145deg,#f7f2e6,#ece4d0);
}
.mat img{width:100%;height:100%;object-fit:contain;display:block;filter:drop-shadow(0 2px 3px rgba(0,0,0,.25));}
.mat-text{text-align:center;color:#2a2418;gap:6px;align-content:center;}
.mat-issuer{font-size:11px;letter-spacing:.14em;text-transform:uppercase;font-weight:700;color:#8a6d1f;display:block;}
.mat-title{font-family:var(--font-display);font-weight:600;font-size:16px;line-height:1.2;display:block;}
.plaque{
  font-size:11.5px;font-weight:600;letter-spacing:.04em;color:#2a2108;text-align:center;line-height:1.3;
  padding:6px 12px;border-radius:2px;max-width:100%;
  background:linear-gradient(#e6cf7a,#c9a227);box-shadow:0 2px 5px rgba(0,0,0,.4), inset 0 1px 0 rgba(255,255,255,.5);
}
.cover-badge{width:110px;height:110px;object-fit:contain;display:block;margin:0 0 4px;}
.cover.is-cert{--c-bg:#f4efe3;--c-fg:#2a2418;background:linear-gradient(145deg,#f7f2e6,#e9e0c9);}
@media (max-width:560px){
  .wall{grid-template-columns:repeat(2,1fr);gap:34px 18px;padding:38px 18px 30px;}
}

/* Lectures inside a course tape */
.lectures{display:grid;gap:10px;}
.lecture{border:1px solid rgba(16,19,34,.12);border-radius:12px;padding:14px 16px;background:#fff;}
.lecture strong{display:block;font-family:var(--font-display);font-size:16px;line-height:1.3;margin-bottom:4px;}
.lec-sum{margin:0 0 6px;font-size:14px;color:#4a4f66;}
.lec-guests{margin:0 0 8px;font-size:13.5px;font-weight:600;color:#6d4fe0;}
.lec-link{display:inline-block;font-size:13.5px;font-weight:700;color:var(--paper-ink);border-bottom:2px solid var(--gold);text-decoration:none;}
.lec-link:hover{color:#8a6d1f;}

/* Expired credentials */
.mat{position:relative;}
.expired-tag{
  position:absolute;top:8px;right:-6px;padding:3px 9px;font-size:10px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;
  color:#fff;background:#8a3b3b;border-radius:2px;box-shadow:0 2px 4px rgba(0,0,0,.35);transform:rotate(4deg);
}
.idea.idea-expired{background:#f3dede;color:#7a2f2f;}

/* Top ten bookmark, shown in the book sheet */
.cover{position:relative;}
.cover-bookmark{
  position:absolute;top:0;right:26px;width:46px;height:78px;box-sizing:border-box;padding-top:12px;
  display:flex;flex-direction:column;align-items:center;gap:2px;color:#fff;
  background:linear-gradient(#d64541,#a82b2b);
  clip-path:polygon(0 0,100% 0,100% 100%,50% 84%,0 100%);
  filter:drop-shadow(0 3px 3px rgba(0,0,0,.35));
  animation:markdrop .5s cubic-bezier(.2,.9,.3,1.2) .15s backwards;
}
.cover-bookmark small{font-size:8.5px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;opacity:.9;}
.cover-bookmark b{font-family:var(--font-display);font-size:17px;line-height:1;}
@keyframes markdrop{from{transform:translateY(-44px);opacity:0;}}
@media (prefers-reduced-motion:reduce){.cover-bookmark{animation:none;}}

.cover:has(.cover-bookmark) .cover-kicker{padding-right:62px;}

/* Certificates shown as the real PDF */
.wall-wide{grid-template-columns:repeat(auto-fill,minmax(250px,1fr));align-items:start;}
.mat.mat-pdf{aspect-ratio:var(--ar,1.294);padding:0;background:#fff;}
.mat-pdf img{width:100%;height:100%;object-fit:cover;filter:none;}
.sheet.sheet-pdf{grid-template-columns:1fr;width:min(1040px,100%);}
.sheet-pdf .cover{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);padding:0;min-height:0;}
.sheet-pdf .content{padding:18px 18px 14px;}
.pdf-view{display:block;width:100%;height:auto;border-radius:6px;box-shadow:0 6px 24px rgba(0,0,0,.25);}
.pdf-bar{display:flex;justify-content:flex-end;padding:12px 4px 0;}