/* ============================================================
   SPADE Consulting v2 — Shared Sub-page Styles
   Used by all pages except the homepage (v2/index.html)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Geist:wght@300;400;500;600;700;800&family=Merriweather:ital,wght@0,300;0,400;0,700;1,300;1,400&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── Design tokens ──────────────────────────────────────────── */
:root {
  --dark-0:  #040508;
  --dark-1:  #07090F;
  --dark-2:  #0C0E1A;
  --dark-3:  #121526;
  --dark-4:  #1A1D30;

  --cream-0: #FFFFFF;
  --cream-1: #EFEDE6;
  --cream-2: #F5F4F0;
  --cream-3: #EAE8E0;

  --blue:         #5B9EFF;
  --blue-on-light:#2B5BAD;
  --blue-dim:     #2D6DD4;
  --green:        #00E87A;

  --td-hi:   #FFFFFF;
  --td-med:  rgba(255,255,255,.68);
  --td-lo:   rgba(255,255,255,.36);

  --tl-hi:   #0A0A0F;
  --tl-med:  #444455;
  --tl-lo:   #888899;

  --bd-dark:  rgba(255,255,255,.08);
  --bd-light: rgba(0,0,0,.08);

  --sans:  'Geist', system-ui, -apple-system, sans-serif;
  --serif: 'Merriweather', Georgia, serif;
  --mono:  'JetBrains Mono', 'IBM Plex Mono', monospace;

  --s1: .5rem;  --s2: 1rem;   --s3: 1.5rem;
  --s4: 2rem;   --s5: 3rem;   --s6: 4rem;
  --s7: 6rem;   --s8: 8rem;

  --r1: 4px; --r2: 8px; --r3: 16px; --r4: 24px; --r5: 9999px;
}

/* ── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; overflow-x: hidden; }
img  { display: block; max-width: 100%; }
a    { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: inherit; }

body {
  font-family: var(--sans);
  background: var(--dark-1);
  color: var(--td-hi);
  line-height: 1.6;
  overflow-x: hidden;
  padding-top: 57px;
}


/* ── Container ──────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--s4);
}
@media (max-width: 640px) { .container { padding: 0 var(--s3); } }

/* ── Typography utilities ───────────────────────────────────── */
.font-mono { font-family: var(--mono); }

.tag {
  font-family: var(--mono);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--blue);
  opacity: .9;
}

.section-title {
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -.02em;
  margin-top: var(--s2);
}

.section-sub {
  font-size: 1.05rem;
  line-height: 1.7;
  margin-top: var(--s2);
  max-width: 56ch;
  color: var(--td-med);
}

/* ── Scroll reveal ──────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  filter: blur(8px);
  transition: opacity .7s cubic-bezier(0.16,1,0.3,1),
              transform .7s cubic-bezier(0.16,1,0.3,1),
              filter .7s cubic-bezier(0.16,1,0.3,1);
}
.reveal.visible { opacity: 1; transform: none; filter: blur(0); }
.reveal-delay-1 { transition-delay: .1s; }
.reveal-delay-2 { transition-delay: .2s; }
.reveal-delay-3 { transition-delay: .3s; }
.reveal-delay-4 { transition-delay: .4s; }

/* ── Buttons ────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .75rem 1.5rem;
  border-radius: var(--r5);
  font-weight: 600;
  font-size: .95rem;
  letter-spacing: -.01em;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
  border: none;
  white-space: nowrap;
  cursor: pointer;
  font-family: var(--sans);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: scale(.97); }

.btn-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: rgba(0,0,0,.12);
  font-size: .72rem;
  flex-shrink: 0;
  transition: transform .25s cubic-bezier(0.16,1,0.3,1);
}
.btn-outline-light .btn-arrow,
.btn-ghost .btn-arrow { background: rgba(255,255,255,.12); }
.btn:hover .btn-arrow { transform: translateX(3px); }

.btn-primary {
  background: var(--cream-1);
  color: var(--dark-1);
  box-shadow: 0 4px 20px rgba(239,237,230,.18);
}
.btn-primary:hover { background: #fff; box-shadow: 0 8px 28px rgba(239,237,230,.30); }

.btn-ghost {
  background: transparent;
  color: var(--td-hi);
  border: 1.5px solid var(--bd-dark);
  backdrop-filter: blur(8px);
}
.btn-ghost:hover { border-color: rgba(255,255,255,.25); background: rgba(255,255,255,.05); }

.btn-dark {
  background: var(--tl-hi);
  color: var(--cream-1);
  box-shadow: 0 4px 16px rgba(0,0,0,.15);
}
.btn-dark:hover { box-shadow: 0 8px 24px rgba(0,0,0,.25); }

.btn-outline {
  background: transparent;
  color: var(--tl-hi);
  border: 1.5px solid var(--bd-light);
}
.btn-outline:hover { background: rgba(0,0,0,.04); }

.btn-outline-light {
  background: transparent;
  color: var(--td-hi);
  border: 1.5px solid rgba(255,255,255,.3);
}
.btn-outline-light:hover { background: rgba(255,255,255,.06); }

/* ── Header / Nav ───────────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  padding: .875rem var(--s4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(7,9,15,.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--bd-dark);
}

.header-logo {
  display: flex;
  align-items: center;
  gap: .75rem;
  text-decoration: none;
}
.header-logo-svg { width: 32px; height: 32px; flex-shrink: 0; }
.header-logo-text {
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -.01em;
  color: var(--td-hi);
  line-height: 1;
}
.header-logo-text span {
  display: block;
  font-weight: 400;
  font-size: .72rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--td-med);
  margin-top: 1px;
  font-family: var(--mono);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--s2);
}
.site-nav a {
  font-size: .88rem;
  font-weight: 500;
  color: var(--td-med);
  transition: color .2s;
  padding: .25rem .5rem;
}
.site-nav a:hover,
.site-nav a[aria-current="page"] { color: var(--td-hi); }
.site-nav .nav-cta {
  background: var(--cream-1);
  color: var(--dark-1);
  border-radius: var(--r5);
  padding: .5rem 1.1rem;
  font-size: .85rem;
  font-weight: 600;
}
.site-nav .nav-cta:hover { background: #fff; color: var(--dark-1); }

.nav-mobile-toggle {
  display: none;
  background: none;
  border: 1.5px solid var(--bd-dark);
  color: var(--td-hi);
  border-radius: var(--r2);
  padding: .35rem .6rem;
  line-height: 1;
}

.mobile-nav {
  display: none;
  flex-direction: column;
  position: fixed;
  top: 57px; left: 0; right: 0;
  background: var(--dark-1);
  border-bottom: 1px solid var(--bd-dark);
  padding: var(--s3) var(--s4);
  z-index: 199;
}
.mobile-nav.open { display: flex; }
.mobile-nav a {
  font-size: 1rem;
  font-weight: 500;
  color: var(--td-med);
  padding: .75rem 0;
  border-bottom: 1px solid var(--bd-dark);
  transition: color .2s;
}
.mobile-nav a:last-child { border-bottom: none; }
.mobile-nav a:hover { color: var(--td-hi); }

@media (max-width: 768px) {
  .site-nav { display: none; }
  .nav-mobile-toggle { display: block; }
}

/* ── Page header (sub-pages) ────────────────────────────────── */
.page-header {
  background: var(--dark-2);
  border-bottom: 1px solid var(--bd-dark);
  padding: var(--s6) 0 var(--s5);
  position: relative;
  overflow: hidden;
}
.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.02) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}
.page-header .container { position: relative; z-index: 1; }
.page-header-breadcrumb {
  font-family: var(--mono);
  font-size: .72rem;
  color: var(--td-lo);
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-bottom: var(--s2);
}
.page-header-breadcrumb a { color: var(--blue); }
.page-header-breadcrumb a:hover { color: var(--td-hi); }
.page-header h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.03em;
  color: var(--td-hi);
}
.page-header-sub {
  font-size: 1.05rem;
  color: var(--td-med);
  margin-top: var(--s2);
  max-width: 56ch;
  line-height: 1.7;
}

/* ── Content sections ───────────────────────────────────────── */
.content-section {
  padding: var(--s6) 0;
}
.content-section--cream {
  background: var(--cream-1);
  color: var(--tl-hi);
}
.content-section--cream .section-sub,
.content-section--cream p { color: var(--tl-med); }
.content-section--cream h2,
.content-section--cream h3 { color: var(--tl-hi); }

/* ── Article layout ─────────────────────────────────────────── */
.article-layout {
  max-width: 760px;
  margin: 0 auto;
  padding: var(--s6) var(--s4);
}

.article-meta {
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--td-lo);
  letter-spacing: .06em;
  margin-bottom: var(--s4);
  display: flex;
  align-items: center;
  gap: var(--s2);
  flex-wrap: wrap;
}
.article-meta .meta-sep { opacity: .3; }

.article-body {
  font-family: var(--serif);
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--td-med);
}
.article-body h2, .article-body h3 { font-family: var(--sans); }
.article-body h2 {
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--td-hi);
  letter-spacing: -.02em;
  margin: var(--s5) 0 var(--s2);
}
.article-body h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--td-hi);
  letter-spacing: -.01em;
  margin: var(--s4) 0 var(--s2);
}
.article-body p { margin-bottom: var(--s3); }
.article-body a { color: var(--blue); text-decoration: underline; text-decoration-color: rgba(91,158,255,.4); }
.article-body a:hover { color: var(--td-hi); }
.article-body ul, .article-body ol {
  margin: var(--s2) 0 var(--s3) var(--s3);
  line-height: 1.9;
}
.article-body blockquote {
  border-left: 3px solid var(--blue);
  padding-left: var(--s3);
  color: var(--td-med);
  font-style: italic;
  margin: var(--s3) 0;
}
.article-body code {
  font-family: var(--mono);
  font-size: .88em;
  background: rgba(255,255,255,.06);
  padding: .15em .4em;
  border-radius: var(--r1);
  color: var(--blue);
}
.article-body pre {
  background: var(--dark-2);
  border: 1px solid var(--bd-dark);
  border-radius: var(--r2);
  padding: var(--s3);
  overflow-x: auto;
  margin: var(--s3) 0;
}
.article-body pre code { background: none; padding: 0; font-size: .85rem; }
.article-body strong { color: var(--td-hi); font-weight: 600; }

.article-cta-bar {
  display: flex;
  align-items: center;
  gap: var(--s2);
  flex-wrap: wrap;
  margin-bottom: var(--s4);
  padding-bottom: var(--s4);
  border-bottom: 1px solid var(--bd-dark);
}

/* ── Footer ─────────────────────────────────────────────────── */
.site-footer {
  background: var(--dark-0);
  border-top: 1px solid var(--bd-dark);
  padding: var(--s6) 0 var(--s4);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--s5);
  padding-bottom: var(--s5);
  border-bottom: 1px solid var(--bd-dark);
}
.footer-brand-text {
  font-size: .9rem;
  color: var(--td-lo);
  line-height: 1.7;
  margin-top: var(--s2);
  max-width: 30ch;
}
.footer-col h4 {
  font-size: .75rem;
  font-family: var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--td-lo);
  margin-bottom: var(--s2);
}
.footer-col a,
.footer-col span {
  display: block;
  font-size: .88rem;
  color: var(--td-med);
  margin-bottom: .6rem;
  transition: color .2s;
}
.footer-col a:hover { color: var(--td-hi); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--s3);
  flex-wrap: wrap;
  gap: var(--s2);
}
.footer-bottom span {
  font-family: var(--mono);
  font-size: .72rem;
  color: var(--td-lo);
}
.footer-btn {
  background: none;
  border: none;
  padding: 0;
  text-align: left;
  color: var(--td-med);
  font-family: var(--sans);
  font-size: .88rem;
  cursor: pointer;
  display: block;
  margin-bottom: .6rem;
  transition: color .2s;
}
.footer-btn:hover { color: var(--td-hi); }

@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--s4); }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

/* ── Contact popup ──────────────────────────────────────────── */
.popup-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(4,5,8,.8);
  backdrop-filter: blur(6px);
  z-index: 500;
}
.popup-overlay.active { display: block; }

.contact-popup {
  display: none;
  position: fixed;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: min(560px, 95vw);
  max-height: 90vh;
  overflow-y: auto;
  background: var(--dark-2);
  border: 1px solid var(--bd-dark);
  border-radius: var(--r3);
  padding: var(--s4);
  z-index: 501;
  box-shadow: 0 32px 80px rgba(0,0,0,.6);
}
.contact-popup.active { display: block; }
.popup-close {
  position: absolute;
  top: var(--s2); right: var(--s3);
  background: none; border: none;
  font-size: 1.4rem;
  color: var(--td-lo);
  line-height: 1;
  transition: color .2s;
}
.popup-close:hover { color: var(--td-hi); }

/* ── Cookie banner ──────────────────────────────────────────── */
#cookie-banner {
  position: fixed;
  bottom: var(--s3); left: var(--s3); right: var(--s3);
  max-width: 540px;
  margin: 0 auto;
  background: var(--dark-3);
  border: 1px solid var(--bd-dark);
  border-radius: var(--r3);
  padding: var(--s3);
  z-index: 600;
  box-shadow: 0 8px 40px rgba(0,0,0,.5);
  color: var(--td-med);
  font-size: .88rem;
}
#cookie-banner h3 { font-size: 1rem; font-weight: 600; color: var(--td-hi); margin-bottom: .5rem; }
.cookie-actions { display: flex; gap: .5rem; flex-wrap: wrap; margin-top: var(--s2); }
.cookie-actions button {
  padding: .4rem .9rem;
  border-radius: var(--r5);
  font-size: .82rem;
  font-weight: 600;
  border: 1px solid var(--bd-dark);
  color: var(--td-hi);
  background: var(--dark-4);
  transition: background .2s;
  cursor: pointer;
  font-family: var(--sans);
}
.cookie-actions .accept-all { background: var(--cream-1); border-color: var(--cream-1); color: var(--dark-1); }
.cookie-actions button:hover { filter: brightness(1.15); }
#cookie-banner a { color: var(--blue); text-decoration: underline; font-size: .8rem; }

/* ── Misc ───────────────────────────────────────────────────── */
.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap;
}
#copy-feedback { color: var(--green); font-size: .85rem; margin-left: .5rem; }

/* ── Light mode ─────────────────────────────────────────────── */
@media (prefers-color-scheme: light) {

  :root {
    --td-hi:  #0A0A0F;
    --td-med: #444455;
    --td-lo:  #888899;
    --bd-dark: rgba(0,0,0,.08);
  }

  body {
    background: var(--cream-1);
    color: var(--tl-hi);
  }

  /* ── Header ── */
  .site-header {
    background: rgba(239,237,230,.88);
    border-bottom-color: rgba(0,0,0,.07);
  }
  .header-logo-text { color: var(--tl-hi); }
  .header-logo-text span { color: var(--tl-med); }
  .header-logo-svg { filter: invert(1); }
  .footer-logo-svg { filter: brightness(0); }
  .site-nav a { color: var(--tl-med); }
  .site-nav a:hover,
  .site-nav a[aria-current="page"] { color: var(--tl-hi); }
  .site-nav .nav-cta { background: var(--tl-hi); color: var(--cream-1); }
  .site-nav .nav-cta:hover { background: var(--dark-2); color: var(--cream-1); }
  .nav-mobile-toggle { color: var(--tl-hi); border-color: rgba(0,0,0,.15); }
  .mobile-nav { background: var(--cream-2); border-bottom-color: rgba(0,0,0,.07); }
  .mobile-nav a { color: var(--tl-med); border-bottom-color: rgba(0,0,0,.06); }
  .mobile-nav a:hover { color: var(--tl-hi); }

  /* ── Page header ── */
  .page-header {
    background: var(--cream-2);
    border-bottom-color: rgba(0,0,0,.07);
  }
  .page-header::before {
    background-image:
      linear-gradient(rgba(0,0,0,.03) 1px, transparent 1px),
      linear-gradient(90deg, rgba(0,0,0,.03) 1px, transparent 1px);
  }
  .page-header-breadcrumb { color: var(--tl-lo); }
  .page-header-breadcrumb a { color: var(--blue-on-light); }
  .page-header-breadcrumb a:hover { color: var(--tl-hi); }
  .page-header h1 { color: var(--tl-hi); }
  .page-header-sub { color: var(--tl-med); }

  /* ── Section text ── */
  .section-title { color: var(--tl-hi); }
  .section-sub { color: var(--tl-med); }
  .tag { color: var(--blue-on-light); }

  /* ── Article ── */
  .article-meta { color: var(--tl-lo); }
  .article-body { color: var(--tl-med); }
  .article-body h2,
  .article-body h3 { color: var(--tl-hi); }
  .article-body strong { color: var(--tl-hi); }
  .article-body a { color: var(--blue-on-light); text-decoration-color: rgba(43,91,173,.35); }
  .article-body a:hover { color: var(--tl-hi); }
  .article-body code {
    background: rgba(0,0,0,.06);
    color: var(--blue-on-light);
  }
  .article-body pre {
    background: var(--cream-3);
    border-color: rgba(0,0,0,.08);
  }
  .article-body blockquote { color: var(--tl-med); }
  .article-cta-bar { border-bottom-color: rgba(0,0,0,.08); }

  /* ── Buttons ── */
  .btn-ghost {
    color: var(--tl-hi);
    border-color: rgba(0,0,0,.15);
  }
  .btn-ghost:hover { border-color: rgba(0,0,0,.25); background: rgba(0,0,0,.04); }
  .btn-outline-light {
    color: var(--tl-hi);
    border-color: rgba(0,0,0,.2);
  }
  .btn-outline-light:hover { background: rgba(0,0,0,.04); }

  /* ── Footer ── */
  .site-footer {
    background: var(--cream-2);
    border-top-color: rgba(0,0,0,.07);
  }
  .footer-grid { border-bottom-color: rgba(0,0,0,.07); }
  .footer-brand-text { color: var(--tl-lo); }
  .footer-col h4 { color: var(--tl-lo); }
  .footer-col a,
  .footer-col span { color: var(--tl-med); }
  .footer-col a:hover { color: var(--tl-hi); }
  .footer-bottom span { color: var(--tl-lo); }
  .footer-btn { color: var(--tl-med); }
  .footer-btn:hover { color: var(--tl-hi); }

  /* ── Contact popup ── */
  .contact-popup {
    background: var(--cream-0);
    border-color: rgba(0,0,0,.08);
    box-shadow: 0 32px 80px rgba(0,0,0,.15);
  }
  .popup-close { color: var(--tl-lo); }
  .popup-close:hover { color: var(--tl-hi); }

  /* ── Cookie banner ── */
  #cookie-banner {
    background: var(--cream-2);
    border-color: rgba(0,0,0,.08);
    color: var(--tl-med);
    box-shadow: 0 8px 40px rgba(0,0,0,.12);
  }
  #cookie-banner h3 { color: var(--tl-hi); }
  .cookie-actions button {
    background: var(--cream-3);
    border-color: rgba(0,0,0,.1);
    color: var(--tl-hi);
  }
  .cookie-actions .accept-all {
    background: var(--tl-hi);
    border-color: var(--tl-hi);
    color: var(--cream-1);
  }
  #cookie-banner a { color: var(--blue-on-light); }
}