/* ============================================================
   THE HUMAN EDGE — DESIGN SYSTEM v1
   Moving off dark+amber toward a technical-document identity.
   Grounded in: structured process, change-management discipline,
   documentation rigour — the actual subject matter of the work.
   ============================================================ */

:root {
  /* Colour */
  --paper:       #EEF0F2;  /* base ground — cool technical paper, not warm cream, not dark */
  --paper-alt:   #F8F9FA;  /* card / panel lift */
  --ink:         #1B2430;  /* primary text + structural marks — deep charcoal-navy, not pure black */
  --ink-soft:    #4A5568;  /* secondary text */
  --index:       #2F4470;  /* primary accent — ink-navy/indigo. replaces amber/gold entirely */
  --index-soft:  #5B7099;  /* lighter accent for hover/secondary use */
  --rule:        #C7CDD6;  /* hairline rules, corner marks, dividers */
  --rule-light:  #DFE3E8;
  --stamp:       #4B7B6F;  /* muted teal — used sparingly for "verified/complete" marks only */
  --stamp-bg:    #E7EFED;

  /* Type */
  --font-display: 'Space Grotesk', sans-serif;
  --font-body:    'IBM Plex Sans', sans-serif;
  --font-mono:    'IBM Plex Mono', monospace;

  /* Scale */
  --step--1: clamp(0.83rem, 0.8rem + 0.15vw, 0.9rem);
  --step-0:  clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --step-1:  clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
  --step-2:  clamp(1.6rem, 1.4rem + 1vw, 2.1rem);
  --step-3:  clamp(2.1rem, 1.8rem + 1.5vw, 3rem);
  --step-4:  clamp(2.8rem, 2.2rem + 3vw, 4.5rem);

  --container: 1180px;
  --gutter: clamp(1.25rem, 4vw, 4rem);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: hidden; width: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0 0 0.5em;
  color: var(--ink);
}
h1 { font-size: var(--step-4); }
h2 { font-size: var(--step-3); }
h3 { font-size: var(--step-2); }

p { margin: 0 0 1.2em; color: var(--ink-soft); max-width: 62ch; }
a { color: var(--index); }

.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--gutter); }
.section { padding: clamp(3rem, 8vw, 7rem) 0; position: relative; }

/* -------- Document chrome: registration marks + revision tags -------- 
   Signature element. Ties directly to the subject: this is a person
   whose actual work is structured documentation and versioned process.
   Corner marks borrow from architectural/print drafting convention. */

.doc-frame { position: relative; }
.doc-frame::before,
.doc-frame::after,
.doc-frame .mark-tl,
.doc-frame .mark-br {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  pointer-events: none;
}
.corner-marks { position: fixed; inset: 0; pointer-events: none; z-index: 5; }
.corner-marks span { position: absolute; width: 22px; height: 22px; }
.corner-marks span::before, .corner-marks span::after {
  content: ''; position: absolute; background: var(--rule);
}
.corner-marks .tl { top: 20px; left: 20px; }
.corner-marks .tr { top: 20px; right: 20px; }
.corner-marks .bl { bottom: 20px; left: 20px; }
.corner-marks .br { bottom: 20px; right: 20px; }
.corner-marks span::before { width: 100%; height: 1px; top: 0; left: 0; }
.corner-marks span::after { width: 1px; height: 100%; top: 0; left: 0; }

.rev-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--ink-soft);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 0.25em 0.6em;
  background: var(--paper-alt);
}
.rev-tag .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--stamp); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--index);
  margin-bottom: 0.75em;
}

.lede { font-size: var(--step-1); color: var(--ink); max-width: 60ch; }

/* -------- Nav -------- */
.nav-menu {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem var(--gutter);
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 10;
}
.nav-brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--ink);
  text-decoration: none;
}
.nav-links { display: flex; gap: 2rem; }
.nav-links a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: var(--step--1);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  transition: color 0.15s ease;
}
.nav-links a:hover, .nav-links a.active { color: var(--index); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--rule);
  border-radius: 4px;
  width: 40px;
  height: 40px;
  cursor: pointer;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 1.1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.7em 1.4em;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  text-decoration: none;
  border: 1px solid var(--index);
  transition: all 0.15s ease;
}
.btn-primary { background: var(--index); color: var(--paper); }
.btn-primary:hover { background: var(--index-soft); border-color: var(--index-soft); }
.btn-ghost { background: transparent; color: var(--index); }
.btn-ghost:hover { background: var(--paper-alt); }
.arr { display: inline-block; transition: transform 0.15s ease; }
.btn:hover .arr { transform: translateX(3px); }

/* -------- Cards (programmes / tiers) -------- */
.prog-list { display: flex; flex-direction: column; gap: 1px; background: var(--rule); border: 1px solid var(--rule); margin-top: 3rem; }
.prog {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 1.5rem;
  background: var(--paper-alt);
  padding: 2.5rem;
}
.prog.featured { background: #fff; box-shadow: inset 3px 0 0 var(--index); }
.prog-meta { display: flex; gap: 0.6rem; margin-bottom: 0.75rem; }
.tier {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--index);
}
.badge {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  background: var(--stamp-bg);
  color: var(--stamp);
  padding: 0.15em 0.6em;
  border-radius: 3px;
}
.specs { list-style: none; padding: 0; margin: 0.75em 0 0; }
.specs li {
  font-size: var(--step--1);
  color: var(--ink-soft);
  padding: 0.2em 0;
}
.specs li::before { content: '— '; color: var(--rule); }
.price { font-family: var(--font-display); font-size: var(--step-2); font-weight: 600; margin-bottom: 0.5rem; }
.prog-right { text-align: right; }

/* -------- Tier detail (Programmes page expanded) -------- */
.tier-detail {
  border: 1px solid var(--rule);
  background: var(--paper-alt);
  padding: 2.5rem;
  margin-top: 1.5rem;
}
.tier-detail h4 {
  font-family: var(--font-mono);
  font-size: var(--step-0);
  color: var(--index);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 1em;
}
.tier-detail ul { padding-left: 1.2em; color: var(--ink-soft); }
.tier-detail li { margin-bottom: 0.5em; }

/* -------- Book component (case studies) -------- */
.book {
  perspective: 2400px;
  max-width: 900px;
  margin: 3rem auto 0;
}
.book-frame {
  position: relative;
  min-height: 480px;
  border: 1px solid var(--rule);
  background: #fff;
  box-shadow: 0 20px 60px -20px rgba(27,36,48,0.25);
}
.book-page {
  position: absolute;
  inset: 0;
  padding: clamp(2rem, 5vw, 4rem);
  opacity: 0;
  visibility: hidden;
  transform: rotateY(0deg);
  transform-origin: left center;
  transition: opacity 0.4s ease, transform 0.5s ease;
  overflow-y: auto;
}
.book-page.active { opacity: 1; visibility: visible; position: relative; }
.book-page .page-num {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--rule);
  position: absolute;
  bottom: 1.5rem;
  right: 2rem;
}
.book-page h3 { font-size: var(--step-1); margin-bottom: 0.3em; }
.book-page .cs-tag {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--index);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  display: block;
  margin-bottom: 1em;
}
.book-page p { color: var(--ink-soft); font-size: var(--step--1); }
.book-page strong { color: var(--ink); font-family: var(--font-mono); font-weight: 500; font-size: 0.95em; }

.book-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1.5rem;
}
.book-dots { display: flex; gap: 0.6rem; }
.book-dots button {
  width: 8px; height: 8px; border-radius: 50%;
  border: 1px solid var(--index);
  background: transparent;
  cursor: pointer;
  padding: 0;
}
.book-dots button.active { background: var(--index); }
.book-btn {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  background: none;
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 0.5em 1em;
  cursor: pointer;
  color: var(--ink);
  transition: all 0.15s ease;
}
.book-btn:hover { border-color: var(--index); color: var(--index); }
.book-btn:disabled { opacity: 0.3; cursor: not-allowed; }

/* -------- Chart (industries x years) -------- */
.chart-wrap { margin-top: 3rem; }
.chart-row { display: flex; align-items: center; gap: 1rem; margin-bottom: 1rem; }
.chart-label { font-family: var(--font-mono); font-size: var(--step--1); width: 220px; flex-shrink: 0; color: var(--ink-soft); }
.chart-track { flex: 1; background: var(--rule-light); height: 28px; position: relative; }
.chart-bar {
  height: 100%;
  background: var(--index);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 0.6em;
  transform-origin: left;
  animation: growBar 1s ease forwards;
}
.chart-bar span { font-family: var(--font-mono); font-size: var(--step--1); color: var(--paper); }
@keyframes growBar { from { transform: scaleX(0); } to { transform: scaleX(1); } }
.chart-note { font-family: var(--font-mono); font-size: var(--step--1); color: var(--rule); margin-top: 1rem; }

/* -------- Footer -------- */
footer {
  border-top: 1px solid var(--rule);
  padding: 3rem var(--gutter);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--ink-soft);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

/* -------- Responsive -------- */
.bio-grid { display: grid; grid-template-columns: 280px 1fr; gap: 3rem; margin-top: 2.5rem; align-items: center; }

@media (max-width: 720px) {
  .bio-grid { grid-template-columns: 1fr; gap: 1.5rem; }
  .nav-menu { flex-wrap: wrap; }
  .nav-toggle { display: block; order: 2; }
  .nav-links {
    display: none;
    order: 3;
    width: 100%;
    flex-direction: column;
    gap: 0;
    margin-top: 1rem;
    border-top: 1px solid var(--rule);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 0.9rem 0; border-bottom: 1px solid var(--rule-light); }
  .nav-menu .btn-primary { order: 4; width: 100%; justify-content: center; margin-top: 1rem; }
  .prog { flex-direction: column; align-items: flex-start; }
  .prog-right { text-align: left; }
  .chart-row { flex-direction: column; align-items: flex-start; gap: 0.4rem; }
  .chart-label { width: auto; }
  .chart-track { width: 100%; }
}

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

/* -------- Focus visibility -------- */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--index);
  outline-offset: 2px;
}

.photo-frame {
  position: relative;
  padding: 12px;
  background: var(--paper-alt);
  border: 1px solid var(--rule);
}
.photo-frame-inner {
  overflow: hidden;
  aspect-ratio: 4/5;
}
.photo-frame-inner img { width: 100%; height: 100%; object-fit: cover; display: block; }
.photo-frame-mark { position: absolute; width: 14px; height: 14px; pointer-events: none; }
.photo-frame-mark::before, .photo-frame-mark::after { content: ''; position: absolute; background: var(--index); }
.photo-frame-mark::before { width: 100%; height: 1px; top: 0; left: 0; }
.photo-frame-mark::after { width: 1px; height: 100%; top: 0; left: 0; }
.photo-frame-mark.tl { top: 4px; left: 4px; }
.photo-frame-mark.tr { top: 4px; right: 4px; }
.photo-frame-mark.tr::after { left: auto; right: 0; }
.photo-frame-mark.bl { bottom: 4px; left: 4px; }
.photo-frame-mark.bl::before { top: auto; bottom: 0; }
.photo-frame-mark.br { bottom: 4px; right: 4px; }
.photo-frame-mark.br::before { top: auto; bottom: 0; }
.photo-frame-mark.br::after { left: auto; right: 0; }
.photo-caption {
  margin-top: 0.75rem;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  color: var(--ink-soft);
  text-align: center;
  letter-spacing: 0.04em;
}

.testimonials { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; margin-top: 3rem; }
.testimonial-card { border: 1px solid var(--rule); background: var(--paper-alt); padding: 2rem; position: relative; }
.testimonial-card::before { content: '\201C'; font-family: var(--font-display); font-size: 3rem; color: var(--rule); position: absolute; top: 0.5rem; left: 1rem; line-height: 1; }
.testimonial-quote { font-size: var(--step--1); color: var(--ink); margin-top: 1.5rem; font-style: italic; }
.testimonial-attr { margin-top: 1.2rem; font-family: var(--font-mono); font-size: var(--step--1); color: var(--index); }
.testimonial-attr span { display: block; color: var(--ink-soft); font-style: normal; margin-top: 0.2em; }

.faq-list { margin-top: 3rem; }
.faq-item { border-bottom: 1px solid var(--rule); padding: 1.5rem 0; }
.faq-q { font-family: var(--font-mono); font-weight: 500; color: var(--index); font-size: var(--step--1); margin: 0 0 0.6em; text-transform: uppercase; letter-spacing: 0.02em; }
.faq-a { color: var(--ink-soft); font-size: var(--step--1); margin: 0; }

/* === NAV GLOBE ANIMATION + FIXES — v5 === */
@keyframes navLonCW  { from { transform: rotate(0deg); } to { transform: rotate(360deg);  } }
@keyframes navLonCCW { from { transform: rotate(0deg); } to { transform: rotate(-360deg); } }
.nav-globe .nav-lon-a { animation: navLonCW  10s linear infinite; transform-origin: 28px 28px; }
.nav-globe .nav-lon-b { animation: navLonCCW 14s linear infinite; transform-origin: 28px 28px; }
a.nav-brand { display: flex !important; align-items: center; gap: 0.5rem; }
.nav-globe { width: 28px; height: 28px; flex-shrink: 0; display: block; }
.nav-links a.btn-primary,
.nav-links a.btn-primary:visited { color: var(--paper); }
.nav-links a.btn-primary:hover  { color: var(--paper); background: var(--ink); }