/* =========================================================
   ANUBHAVGYAN — design tokens
   Concept: an open field-logbook. Experience gets logged,
   dated, numbered, and turned into knowledge.
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;600;700&family=Source+Serif+4:ital,opsz,wght@0,8..60,400;0,8..60,600;1,8..60,400&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root{
  --ink: #1C2430;
  --ink-soft: #262F3D;
  --ink-line: #384254;
  --paper: #F5F0E2;
  --paper-dim: #ECE5D2;
  --paper-line: #DCD2B6;
  --amber: #E0902C;
  --amber-deep: #B96F1B;
  --moss: #5C7A5C;
  --ink-text: #232A35;
  --paper-text: #F3EFE3;
  --muted: #98A0AC;
  --muted-on-paper: #7A7360;

  --display: 'Space Grotesk', sans-serif;
  --body: 'Source Serif 4', Georgia, serif;
  --mono: 'IBM Plex Mono', monospace;

  --nav-w: 84px;
  --radius: 3px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--ink);
  color:var(--paper-text);
  font-family:var(--body);
  font-size:17px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
ul{list-style:none;margin:0;padding:0;}

::selection{background:var(--amber);color:var(--ink);}

@media (prefers-reduced-motion: reduce){
  *{animation-duration:0.01ms !important; transition-duration:0.01ms !important;}
}

/* ---------- utility ---------- */
.eyebrow{
  font-family:var(--mono);
  font-size:.72rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--amber);
}
.wrap{
  max-width:1180px;
  margin:0 auto;
  padding:0 40px;
}
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--mono);
  font-size:.82rem;
  letter-spacing:.03em;
  padding:12px 22px;
  border-radius:var(--radius);
  border:1px solid var(--amber);
  color:var(--amber);
  background:transparent;
  cursor:pointer;
  transition:background .18s ease, color .18s ease, transform .18s ease;
}
.btn:hover{background:var(--amber);color:var(--ink);transform:translateY(-1px);}
.btn.solid{background:var(--amber);color:var(--ink);}
.btn.solid:hover{background:var(--amber-deep);border-color:var(--amber-deep);}
.btn:focus-visible, a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible{
  outline:2px solid var(--amber);
  outline-offset:3px;
}

/* =========================================================
   BINDER-TAB NAVIGATION (signature element)
   Desktop: fixed vertical strip of tabs, like a binder spine.
   Mobile: collapses to a top bar with a slide-out tab list.
   ========================================================= */
.tabnav{
  position:fixed;
  top:0; left:0; bottom:0;
  width:var(--nav-w);
  background:var(--ink-soft);
  border-right:1px solid var(--ink-line);
  z-index:100;
  display:flex;
  flex-direction:column;
  align-items:center;
  padding:22px 0;
}
.tabnav__mark{
  font-family:var(--display);
  font-weight:700;
  font-size:1.1rem;
  color:var(--amber);
  writing-mode:vertical-rl;
  transform:rotate(180deg);
  margin-bottom:34px;
  letter-spacing:.04em;
}
.tabnav__list{
  display:flex;
  flex-direction:column;
  gap:6px;
  flex:1;
  width:100%;
}
.tabnav__tab{
  position:relative;
  writing-mode:vertical-rl;
  transform:rotate(180deg);
  font-family:var(--mono);
  font-size:.74rem;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--muted);
  padding:16px 0;
  width:100%;
  text-align:center;
  border-left:3px solid transparent;
  transition:color .18s ease, border-color .18s ease, background .18s ease;
}
.tabnav__tab:hover{color:var(--paper-text);}
.tabnav__tab.is-active{
  color:var(--ink);
  background:var(--paper);
  border-left:3px solid var(--amber);
}
.tabnav__tab.is-active::after{
  content:"";
  position:absolute;
  right:-1px; top:0;
  width:1px; height:100%;
  background:var(--paper);
}
.tabnav__foot{
  font-family:var(--mono);
  font-size:.62rem;
  color:var(--muted);
  writing-mode:vertical-rl;
  transform:rotate(180deg);
  letter-spacing:.08em;
}

.mobilebar{
  display:none;
  position:sticky; top:0; z-index:100;
  background:var(--ink-soft);
  border-bottom:1px solid var(--ink-line);
  padding:16px 20px;
  align-items:center;
  justify-content:space-between;
}
.mobilebar__mark{font-family:var(--display);font-weight:700;color:var(--amber);}
.mobilebar__toggle{
  background:none;border:1px solid var(--ink-line);color:var(--paper-text);
  font-family:var(--mono);font-size:.75rem;padding:8px 12px;border-radius:var(--radius);
}
.mobiledrawer{
  display:none;
  position:sticky; top:53px; z-index:99;
  background:var(--ink-soft);
  border-bottom:1px solid var(--ink-line);
}
.mobiledrawer.is-open{display:block;}
.mobiledrawer a{
  display:block;
  font-family:var(--mono);
  font-size:.8rem;
  letter-spacing:.06em;
  text-transform:uppercase;
  padding:14px 20px;
  border-top:1px solid var(--ink-line);
  color:var(--muted);
}
.mobiledrawer a.is-active{color:var(--amber);}

main{margin-left:var(--nav-w);}

@media (max-width: 860px){
  .tabnav{display:none;}
  .mobilebar{display:flex;}
  main{margin-left:0;}
  .wrap{padding:0 22px;}
}

/* =========================================================
   HERO
   ========================================================= */
.hero{
  padding:120px 0 90px;
  border-bottom:1px solid var(--ink-line);
  position:relative;
  overflow:hidden;
}
.hero__entry{
  font-family:var(--mono);
  font-size:.78rem;
  color:var(--muted);
  margin-bottom:22px;
}
.hero__entry span{color:var(--amber);}
.hero h1{
  font-family:var(--display);
  font-weight:700;
  font-size:clamp(2.4rem, 6vw, 4.4rem);
  line-height:1.04;
  margin:0 0 26px;
  max-width:15ch;
  letter-spacing:-.01em;
}
.hero h1 em{
  font-style:normal;
  color:var(--amber);
}
.hero p.lede{
  font-size:1.18rem;
  color:var(--paper-text);
  opacity:.82;
  max-width:52ch;
  margin:0 0 40px;
}
.hero__actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:56px;}

.hero__stats{
  display:flex;
  gap:0;
  border-top:1px solid var(--ink-line);
  flex-wrap:wrap;
}
.hero__stat{
  padding:22px 34px 0 0;
  margin-right:34px;
  border-right:1px solid var(--ink-line);
}
.hero__stat:last-child{border-right:none;}
.hero__stat b{
  display:block;
  font-family:var(--display);
  font-size:1.7rem;
  color:var(--paper-text);
}
.hero__stat span{
  font-family:var(--mono);
  font-size:.68rem;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--muted);
}

/* =========================================================
   SECTION SCAFFOLDING
   ========================================================= */
section.block{padding:86px 0;border-bottom:1px solid var(--ink-line);}
section.block.on-paper{background:var(--paper);color:var(--ink-text);border-bottom:none;}
.block__head{
  display:flex;
  justify-content:space-between;
  align-items:flex-end;
  gap:24px;
  margin-bottom:46px;
  flex-wrap:wrap;
}
.block__head h2{
  font-family:var(--display);
  font-weight:700;
  font-size:clamp(1.7rem,3.4vw,2.3rem);
  margin:10px 0 0;
}
.block__head p{
  margin:8px 0 0;
  max-width:46ch;
  opacity:.75;
}
.block__link{
  font-family:var(--mono);
  font-size:.78rem;
  letter-spacing:.04em;
  color:var(--amber);
  white-space:nowrap;
  border-bottom:1px solid var(--amber);
  padding-bottom:2px;
}

/* =========================================================
   PILLARS (4 offerings)
   ========================================================= */
.pillars{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:1px;
  background:var(--ink-line);
  border:1px solid var(--ink-line);
}
.pillar{
  background:var(--ink);
  padding:34px 26px 30px;
  transition:background .18s ease;
}
.pillar:hover{background:var(--ink-soft);}
.pillar__num{
  font-family:var(--mono);
  font-size:.72rem;
  color:var(--amber);
  margin-bottom:22px;
  display:block;
}
.pillar h3{
  font-family:var(--display);
  font-size:1.15rem;
  margin:0 0 10px;
}
.pillar p{
  font-size:.92rem;
  opacity:.72;
  margin:0 0 18px;
}
.pillar a{
  font-family:var(--mono);
  font-size:.72rem;
  color:var(--amber);
  letter-spacing:.04em;
}
@media (max-width:860px){
  .pillars{grid-template-columns:1fr 1fr;}
}
@media (max-width:560px){
  .pillars{grid-template-columns:1fr;}
}

/* =========================================================
   ENTRY CARDS (index-card look, used for blog/video/ebook)
   ========================================================= */
.entries{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
}
@media (max-width:900px){ .entries{grid-template-columns:1fr 1fr;} }
@media (max-width:620px){ .entries{grid-template-columns:1fr;} }

.card{
  background:var(--paper);
  color:var(--ink-text);
  border-radius:var(--radius);
  border:1px solid var(--paper-line);
  position:relative;
  padding:22px 22px 24px;
  display:flex;
  flex-direction:column;
  transition:transform .18s ease, box-shadow .18s ease;
}
.card::before{
  content:"";
  position:absolute;
  top:16px; left:-1px;
  width:5px; height:22px;
  background:var(--amber);
  border-radius:0 2px 2px 0;
}
.card:hover{transform:translateY(-3px);box-shadow:0 10px 24px rgba(0,0,0,.25);}
.card__meta{
  display:flex;
  justify-content:space-between;
  font-family:var(--mono);
  font-size:.68rem;
  color:var(--muted-on-paper);
  margin-bottom:14px;
  letter-spacing:.03em;
}
.card__meta .tag{color:var(--moss);text-transform:uppercase;}
.card h3{
  font-family:var(--display);
  font-size:1.1rem;
  line-height:1.3;
  margin:0 0 10px;
}
.card p{
  font-size:.92rem;
  opacity:.78;
  margin:0 0 18px;
  flex:1;
}
.card__foot{
  font-family:var(--mono);
  font-size:.72rem;
  color:var(--amber-deep);
  border-top:1px dashed var(--paper-line);
  padding-top:14px;
}

/* on-paper section variant for entries needs dark card to contrast */
.on-paper .card{
  background:var(--ink);
  color:var(--paper-text);
  border-color:var(--ink-line);
}
.on-paper .card__meta{color:var(--muted);}
.on-paper .card p{opacity:.72;}
.on-paper .card__foot{color:var(--amber);border-color:var(--ink-line);}

/* video-specific card */
.card--video .thumb{
  aspect-ratio:16/9;
  width:calc(100% + 44px);
  margin:-22px -22px 16px;
  background:var(--ink-line);
  border-radius:var(--radius) var(--radius) 0 0;
  overflow:hidden;
  position:relative;
}
.card--video .thumb iframe{width:100%;height:100%;border:0;display:block;}
.card--video .thumb .play{
  position:absolute;inset:0;
  display:flex;align-items:center;justify-content:center;
  background:rgba(28,36,48,.35);
  font-family:var(--mono);color:#fff;font-size:.8rem;
}

/* ebook cover */
.card--ebook .cover{
  aspect-ratio:3/4;
  width:100%;
  margin-bottom:16px;
  border-radius:2px;
  background:linear-gradient(160deg,var(--ink-soft),var(--ink));
  border:1px solid var(--ink-line);
  display:flex;
  align-items:center;
  justify-content:center;
  text-align:center;
  padding:20px;
}
.on-paper .card--ebook .cover{border-color:var(--paper-line);}
.card--ebook .cover span{
  font-family:var(--display);
  font-weight:700;
  color:var(--amber);
  font-size:1.05rem;
  line-height:1.3;
}

/* =========================================================
   ASK / HELP SECTION
   ========================================================= */
.ask-cta{
  background:var(--amber);
  color:var(--ink);
  padding:70px 0;
}
.ask-cta .wrap{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:30px;
  flex-wrap:wrap;
}
.ask-cta h2{
  font-family:var(--display);
  font-weight:700;
  font-size:clamp(1.6rem,3.4vw,2.2rem);
  max-width:20ch;
  margin:0;
}
.ask-cta .btn{border-color:var(--ink);color:var(--ink);}
.ask-cta .btn:hover{background:var(--ink);color:var(--paper-text);}

/* =========================================================
   FORM (Ask page)
   ========================================================= */
.form-card{
  background:var(--paper);
  color:var(--ink-text);
  border-radius:var(--radius);
  border:1px solid var(--paper-line);
  padding:40px;
  max-width:640px;
}
.field{margin-bottom:22px;}
.field label{
  display:block;
  font-family:var(--mono);
  font-size:.72rem;
  letter-spacing:.06em;
  text-transform:uppercase;
  color:var(--muted-on-paper);
  margin-bottom:8px;
}
.field input,.field select,.field textarea{
  width:100%;
  font-family:var(--body);
  font-size:1rem;
  padding:12px 14px;
  border:1px solid var(--paper-line);
  border-radius:var(--radius);
  background:#fff;
  color:var(--ink-text);
}
.field textarea{resize:vertical;min-height:120px;}
.field-row{display:flex;gap:16px;}
.field-row .field{flex:1;}
@media (max-width:560px){.field-row{flex-direction:column;gap:0;}}

/* =========================================================
   FOOTER
   ========================================================= */
footer{
  padding:60px 0 40px;
  font-family:var(--mono);
  font-size:.8rem;
  color:var(--muted);
}
footer .wrap{
  display:flex;
  justify-content:space-between;
  gap:20px;
  flex-wrap:wrap;
}
footer a{color:var(--muted);}
footer a:hover{color:var(--amber);}
footer .foot-links{display:flex;gap:22px;flex-wrap:wrap;}

/* generic page header for inner pages */
.pagehead{padding:90px 0 60px;border-bottom:1px solid var(--ink-line);}
.pagehead h1{
  font-family:var(--display);
  font-weight:700;
  font-size:clamp(2rem,5vw,3.2rem);
  margin:14px 0 16px;
}
.pagehead p{max-width:56ch;opacity:.78;font-size:1.08rem;}

/* filter tabs (blog/videos/ebooks) */
.filters{display:flex;gap:10px;flex-wrap:wrap;margin:8px 0 46px;}
.filters button{
  font-family:var(--mono);
  font-size:.72rem;
  letter-spacing:.05em;
  text-transform:uppercase;
  padding:9px 16px;
  border-radius:20px;
  border:1px solid var(--ink-line);
  background:transparent;
  color:var(--muted);
  cursor:pointer;
}
.on-paper .filters button{border-color:var(--paper-line);color:var(--muted-on-paper);}
.filters button.is-active{background:var(--amber);border-color:var(--amber);color:var(--ink);}