/* =========================================================
   KRYPTOWOLF — Design tokens
   Palette: near-black surfaces, Bitcoin orange signal, bone-white text.
   Type: Poppins (display) / Inter (body) / JetBrains Mono (data, eyebrows).
   Signature element: the "shelf" — a row of book spines used as nav,
   drawn in pure CSS, standing in for the ten-title catalog.
   ========================================================= */

:root{
  --ink:        #0A0A0B;   /* page background */
  --surface:    #131315;   /* card / panel background */
  --surface-2:  #1B1B1E;   /* raised panel */
  --line:       #2A2A2E;   /* hairline borders */
  --bone:       #F3F1EA;   /* primary text */
  --bone-dim:   #9A9994;   /* secondary text */
  --orange:     #F7931A;   /* Bitcoin orange — signal color */
  --orange-hi:  #FFAD42;   /* hover state */
  --orange-dim: #7A4A0E;   /* muted orange for borders on dark */
  --green:      #4FAE84;   /* confirmation / success accent, used sparingly */

  --font-display: 'Poppins', 'Liberation Sans', 'Arial', sans-serif;
  --font-body:    'Inter', 'Liberation Sans', 'Helvetica Neue', sans-serif;
  --font-mono:    'JetBrains Mono', 'Liberation Mono', 'Courier New', monospace;

  --container: 1180px;
  --radius: 3px;
}

*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  background: var(--ink);
  color: var(--bone);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img{ max-width:100%; display:block; }
a{ color: inherit; text-decoration: none; }
ul{ margin:0; padding:0; list-style:none; }
h1,h2,h3,h4{
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}
p{ margin:0 0 1em; color: var(--bone); }
.container{
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.eyebrow{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--orange);
}
.muted{ color: var(--bone-dim); }

/* Skip link for keyboard users */
.skip-link{
  position:absolute; left:-999px; top:0; z-index:200;
  background:var(--orange); color:#111; padding:10px 16px; border-radius:var(--radius);
}
.skip-link:focus{ left:16px; top:16px; }

/* Focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible{
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce){
  *{ animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

/* ---------- Header / Nav ---------- */
.site-header{
  position: sticky; top:0; z-index:100;
  background: rgba(10,10,11,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav-row{
  display:flex; align-items:center; justify-content:space-between;
  padding: 16px 24px;
}
.logo{
  display:flex; align-items:center; gap:10px;
  font-family: var(--font-display); font-weight:700;
  font-size: 19px; letter-spacing: 0.01em; color: var(--bone);
}
.logo .mark{
  width:30px; height:30px; flex:none;
}
.logo .mark svg{ width:100%; height:100%; display:block; }
.logo b{ color: var(--orange); }

.nav-links{
  display:flex; gap:32px;
  font-family: var(--font-mono);
  font-size: 13px; letter-spacing: 0.04em; text-transform: uppercase;
}
.nav-links a{
  color: var(--bone-dim); position:relative; padding-bottom:4px;
  transition: color .15s ease;
}
.nav-links a:hover, .nav-links a[aria-current="page"]{ color: var(--bone); }
.nav-links a[aria-current="page"]::after{
  content:""; position:absolute; left:0; right:0; bottom:-6px; height:2px; background:var(--orange);
}
.nav-cta{
  font-family: var(--font-mono); font-size:12px; letter-spacing:.06em; text-transform:uppercase;
  color:#0A0A0B; background:var(--orange); padding:10px 18px; border-radius: var(--radius);
  border:1px solid var(--orange); white-space:nowrap;
  transition: background .15s ease, color .15s ease;
}
.nav-cta:hover{ background: var(--orange-hi); }

.nav-toggle{
  display:none; background:none; border:1px solid var(--line); color:var(--bone);
  width:40px; height:40px; border-radius:var(--radius); cursor:pointer;
}
.mobile-panel{ display:none; }

@media (max-width: 880px){
  .nav-links{ display:none; }
  .nav-cta.desktop-only{ display:none; }
  .nav-toggle{ display:block; }
  .mobile-panel.open{
    display:flex; flex-direction:column; gap:0;
    border-top:1px solid var(--line);
  }
  .mobile-panel a{
    padding:16px 24px; border-bottom:1px solid var(--line);
    font-family: var(--font-mono); font-size:13px; text-transform:uppercase; letter-spacing:.05em;
    color: var(--bone-dim);
  }
  .mobile-panel a[aria-current="page"]{ color: var(--orange); }
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:8px;
  font-family: var(--font-mono); font-size:13px; letter-spacing:.05em; text-transform:uppercase;
  padding: 13px 22px; border-radius: var(--radius); border:1px solid transparent; cursor:pointer;
  transition: transform .12s ease, background .15s ease, border-color .15s ease, color .15s ease;
}
.btn:hover{ transform: translateY(-1px); }
.btn-primary{ background: var(--orange); color:#0A0A0B; border-color:var(--orange); }
.btn-primary:hover{ background: var(--orange-hi); border-color:var(--orange-hi); }
.btn-ghost{ background: transparent; color: var(--bone); border-color: var(--line); }
.btn-ghost:hover{ border-color: var(--orange); color: var(--orange); }
.btn-block{ width:100%; justify-content:center; }
.btn[aria-disabled="true"]{ opacity:.45; pointer-events:none; }

/* ---------- Hero ---------- */
.hero{
  padding: 96px 0 64px;
  border-bottom: 1px solid var(--line);
  position: relative;
  overflow:hidden;
}
.hero::before{
  content:"";
  position:absolute; inset:0;
  background:
    radial-gradient(600px 300px at 85% -10%, rgba(247,147,26,0.14), transparent 60%);
  pointer-events:none;
}
.hero-grid{
  display:grid; grid-template-columns: 1.05fr 0.95fr; gap:56px; align-items:center;
  position:relative;
}
.hero h1{
  font-size: clamp(36px, 5vw, 56px);
  margin-bottom: 20px;
}
.hero h1 em{
  font-style:normal; color: var(--orange);
}
.hero .lede{ font-size:18px; color:var(--bone-dim); max-width: 46ch; margin-bottom: 28px; }
.hero .cta-row{ display:flex; gap:14px; flex-wrap:wrap; }
.hero-stats{
  display:flex; gap:28px; margin-top:40px; flex-wrap:wrap;
}
.hero-stat b{ display:block; font-family:var(--font-display); font-size:26px; color:var(--bone); }
.hero-stat span{ font-family:var(--font-mono); font-size:11px; letter-spacing:.08em; text-transform:uppercase; color:var(--bone-dim); }

/* ---------- The Shelf: signature CSS book-spine element ---------- */
.shelf-wrap{ position:relative; }
.shelf{
  display:flex; align-items:flex-end; gap:6px;
  height: 300px;
  padding: 0 0 18px;
  border-bottom: 4px solid var(--orange-dim);
  position:relative;
}
.spine{
  flex:1 1 0;
  min-width: 0;
  border-radius: 3px 3px 0 0;
  display:flex; align-items:flex-end; justify-content:center;
  padding-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: rgba(243,241,234,0.75);
  writing-mode: vertical-rl;
  text-orientation: mixed;
  letter-spacing: 0.02em;
  border: 1px solid rgba(255,255,255,0.06);
  border-bottom:none;
  box-shadow: inset 0 12px 18px -12px rgba(0,0,0,0.6);
  transition: transform .18s ease, box-shadow .18s ease;
}
.spine:hover{ transform: translateY(-8px); }
.shelf .spine:nth-child(1){ height:78%; background:#20242A; }
.shelf .spine:nth-child(2){ height:92%; background:#F7931A; color:#0A0A0B; }
.shelf .spine:nth-child(3){ height:68%; background:#2B2118; }
.shelf .spine:nth-child(4){ height:100%; background:#1B1B1E; }
.shelf .spine:nth-child(5){ height:84%; background:#3A2A14; }
.shelf .spine:nth-child(6){ height:74%; background:#20242A; }
.shelf .spine:nth-child(7){ height:96%; background:#1B1B1E; }
.shelf .spine:nth-child(8){ height:64%; background:#F7931A; color:#0A0A0B; }
.shelf .spine:nth-child(9){ height:88%; background:#2B2118; }
.shelf .spine:nth-child(10){ height:80%; background:#1B1B1E; }
.shelf-caption{
  text-align:center; margin-top:14px; font-family:var(--font-mono); font-size:11px;
  color: var(--bone-dim); letter-spacing:.05em;
}

@media (max-width: 880px){
  .hero-grid{ grid-template-columns: 1fr; }
  .shelf{ height:220px; }
}

/* ---------- Section scaffolding ---------- */
section{ padding: 84px 0; }
.section-head{ max-width: 640px; margin-bottom: 44px; }
.section-head h2{ font-size: clamp(28px, 3.4vw, 38px); }
.divider{ border:none; border-top:1px solid var(--line); margin:0; }

/* ---------- Book grid ---------- */
.book-grid{
  display:grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap:22px;
}
.book-card{
  background: var(--surface);
  border:1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  display:flex; flex-direction:column; gap:12px;
  transition: border-color .15s ease, transform .15s ease;
}
.book-card:hover{ border-color: var(--orange-dim); transform: translateY(-3px); }
.book-cover{
  height: 210px; border-radius: 2px;
  overflow:hidden;
  background: linear-gradient(155deg, #1B1B1E, #0A0A0B);
  border:1px solid var(--line);
}
.book-cover img{
  width:100%; height:100%; object-fit:cover; object-position: top center;
  display:block;
  transition: transform .25s ease;
}
.book-card:hover .book-cover img{ transform: scale(1.03); }
.book-card .stage{
  font-family: var(--font-mono); font-size:10px; text-transform:uppercase; letter-spacing:.08em; color:var(--orange);
}
.book-card h3{ font-size:18px; margin-bottom:2px; }
.book-card p{ font-size:14px; color:var(--bone-dim); margin-bottom:4px; flex:1; }
.book-links{ display:flex; gap:10px; flex-wrap:wrap; margin-top:auto; }
.book-links .btn{ padding:9px 14px; font-size:11px; }

/* ---------- Callouts / cards ---------- */
.card{
  background: var(--surface);
  border:1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
}
.grid-3{ display:grid; grid-template-columns:repeat(3,1fr); gap:22px; }
.grid-2{ display:grid; grid-template-columns:1fr 1fr; gap:22px; }
@media (max-width: 880px){ .grid-3{ grid-template-columns:1fr; } .grid-2{ grid-template-columns:1fr; } }

/* ---------- Blog ---------- */
.post-list{ display:flex; flex-direction:column; }
.post-row{
  display:grid; grid-template-columns: 140px 1fr; gap:26px;
  padding: 28px 0; border-bottom: 1px solid var(--line);
}
.post-row:first-child{ padding-top:0; }
.post-date{ font-family: var(--font-mono); font-size:12px; color:var(--bone-dim); padding-top:4px; }
.post-row h3{ font-size:21px; margin-bottom:8px; }
.post-row h3 a:hover{ color: var(--orange); }
.post-tag{
  display:inline-block; font-family:var(--font-mono); font-size:10px; text-transform:uppercase;
  letter-spacing:.06em; color:var(--orange); border:1px solid var(--orange-dim); border-radius:2px;
  padding:3px 8px; margin-bottom:10px;
}
@media (max-width:640px){ .post-row{ grid-template-columns:1fr; gap:8px; } }

/* ---------- Resources ---------- */
.resource-row{
  display:grid; grid-template-columns: 1fr auto; gap:20px; align-items:center;
  padding: 20px; border:1px solid var(--line); border-radius: var(--radius); background: var(--surface);
  margin-bottom:14px;
}
.resource-row h4{ font-size:16px; margin-bottom:4px; }
.resource-row .filemeta{ font-family:var(--font-mono); font-size:11px; color:var(--bone-dim); }
@media (max-width:640px){ .resource-row{ grid-template-columns:1fr; } }

/* ---------- About ---------- */
.about-grid{
  display:grid; grid-template-columns: 320px 1fr; gap:56px; align-items:start;
}
.about-portrait{
  aspect-ratio: 4/5;
  background: linear-gradient(165deg, var(--surface-2), var(--ink));
  border:1px solid var(--line);
  border-radius: var(--radius);
  display:flex; align-items:center; justify-content:center;
  position:relative; overflow:hidden;
}
.about-portrait .wolfmark{ width:40%; opacity:.9; }
.about-portrait::after{
  content:""; position:absolute; inset:0;
  background: radial-gradient(220px 220px at 30% 20%, rgba(247,147,26,0.18), transparent 60%);
}
.pillars{ display:flex; flex-direction:column; gap:18px; margin-top:26px; }
.pillar{ display:flex; gap:14px; }
.pillar .num{ font-family:var(--font-mono); color:var(--orange); font-size:13px; padding-top:2px; }
@media (max-width:880px){ .about-grid{ grid-template-columns:1fr; } }

/* ---------- Contact ---------- */
.contact-grid{ display:grid; grid-template-columns: 1fr 1fr; gap:56px; }
.field{ margin-bottom:18px; }
.field label{
  display:block; font-family:var(--font-mono); font-size:11px; text-transform:uppercase;
  letter-spacing:.06em; color:var(--bone-dim); margin-bottom:8px;
}
.field input, .field textarea, .field select{
  width:100%; background: var(--surface); border:1px solid var(--line); border-radius:var(--radius);
  padding:12px 14px; color:var(--bone); font-family:var(--font-body); font-size:15px;
}
.field textarea{ min-height:140px; resize:vertical; }
.field input:focus, .field textarea:focus, .field select:focus{ border-color:var(--orange); }
.form-note{ font-size:13px; color:var(--bone-dim); margin-top:10px; }
.form-status{ font-family:var(--font-mono); font-size:13px; margin-top:14px; display:none; }
.form-status.show{ display:block; }
.form-status.ok{ color: var(--green); }
.form-status.err{ color:#E0664A; }
.contact-meta .card{ margin-bottom:16px; }
.contact-meta h4{ font-size:14px; text-transform:uppercase; letter-spacing:.04em; font-family:var(--font-mono); color:var(--orange); margin-bottom:8px; }
@media (max-width:880px){ .contact-grid{ grid-template-columns:1fr; } }

/* ---------- Newsletter strip ---------- */
.strip{
  border-top:1px solid var(--line); border-bottom:1px solid var(--line);
  background: var(--surface);
}
.strip-row{
  display:flex; justify-content:space-between; align-items:center; gap:24px; flex-wrap:wrap;
  padding: 40px 0;
}
.strip h3{ font-size:22px; margin-bottom:4px; }
.strip-form{ display:flex; gap:10px; flex-wrap:wrap; }
.strip-form input{
  background: var(--ink); border:1px solid var(--line); border-radius:var(--radius);
  padding:12px 14px; color:var(--bone); min-width:240px;
}

/* ---------- Footer ---------- */
.site-footer{ padding: 56px 0 28px; }
.footer-grid{
  display:grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap:32px; margin-bottom:40px;
}
.footer-grid h5{
  font-family:var(--font-mono); font-size:11px; text-transform:uppercase; letter-spacing:.08em;
  color: var(--bone-dim); margin-bottom:14px;
}
.footer-grid a{ display:block; padding:6px 0; color:var(--bone-dim); font-size:14px; }
.footer-grid a:hover{ color: var(--orange); }
.footer-bottom{
  border-top:1px solid var(--line); padding-top:24px;
  display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:12px;
  font-family: var(--font-mono); font-size:12px; color:var(--bone-dim);
}
@media (max-width:880px){ .footer-grid{ grid-template-columns:1fr 1fr; } }
@media (max-width:520px){ .footer-grid{ grid-template-columns:1fr; } }

/* ---------- Page header (interior pages) ---------- */
.page-header{
  padding: 64px 0 48px; border-bottom:1px solid var(--line);
}
.page-header h1{ font-size: clamp(30px,4vw,44px); }
.page-header .lede{ color:var(--bone-dim); max-width:60ch; font-size:16px; }

/* ---------- FAQ ---------- */
.faq-item{ border-bottom:1px solid var(--line); }
.faq-q{
  width:100%; text-align:left; background:none; border:none; color:var(--bone);
  padding: 20px 0; font-family:var(--font-display); font-size:16px; cursor:pointer;
  display:flex; justify-content:space-between; align-items:center; gap:16px;
}
.faq-q .plus{ color:var(--orange); font-family:var(--font-mono); flex:none; }
.faq-a{ display:none; padding-bottom:20px; color:var(--bone-dim); max-width:65ch; }
.faq-item.open .faq-a{ display:block; }
.faq-item.open .plus{ transform:rotate(45deg); display:inline-block; }