/* ==========================================================================
   ValueChainOS — site stylesheet
   Brand tokens per ValueChainOS Brand Kit (Direction B: Forest palette)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600;700&family=IBM+Plex+Sans:wght@400;500;600;700&display=swap');

:root {
  --forest:      oklch(0.40 0.07 145);
  --forest-deep: oklch(0.30 0.06 145);
  --forest-mid:  oklch(0.50 0.08 145);
  --moss:        oklch(0.58 0.09 130);
  --sage:        oklch(0.72 0.06 130);
  --soil:        oklch(0.45 0.06 65);
  --clay:        oklch(0.62 0.13 45);
  --cream:       oklch(0.97 0.012 90);
  --paper:       oklch(0.94 0.012 90);
  --ink:         oklch(0.20 0.018 135);
  --rule:        oklch(0.88 0.012 90);
  --rule-dark:   oklch(0.32 0.03 145);
  --muted:       oklch(0.45 0.02 135);

  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --sans: "IBM Plex Sans", ui-sans-serif, system-ui, sans-serif;

  --max: 1180px;
  --radius: 12px;
  --radius-sm: 8px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  padding: 0;
  background: var(--cream);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; }
h1, h2, h3, h4 { font-family: var(--mono); font-weight: 600; letter-spacing: -0.02em; color: var(--forest-deep); margin: 0 0 14px; line-height: 1.15; }
h1 { font-size: clamp(34px, 5vw, 58px); letter-spacing: -0.03em; }
h2 { font-size: clamp(26px, 3.4vw, 38px); }
h3 { font-size: 20px; }
h4 { font-size: 15px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--soil); }
p { margin: 0 0 16px; color: var(--muted); }
.container { max-width: var(--max); margin: 0 auto; padding: 0 32px; }

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--soil);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}
.eyebrow::before { content: ""; width: 18px; height: 1px; background: var(--moss); display: inline-block; }

.lede { font-size: 18px; line-height: 1.65; color: var(--muted); max-width: 620px; }

/* ---- Buttons ---- */
.btn {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 13px 26px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all .15s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--forest); color: var(--cream); }
.btn-primary:hover { background: var(--forest-deep); }
.btn-outline { background: transparent; border-color: var(--rule); color: var(--forest-deep); }
.btn-outline:hover { border-color: var(--forest); background: var(--paper); }
.btn-ghost-light { background: transparent; border-color: rgba(255,255,255,0.28); color: var(--cream); }
.btn-ghost-light:hover { background: rgba(255,255,255,0.1); }
.btn-lg { padding: 15px 30px; font-size: 14px; }
.btn-row { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }

/* ---- Header / Nav ---- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(247,246,241,0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}
.nav {
  max-width: var(--max); margin: 0 auto; padding: 16px 32px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo img { height: 30px; width: auto; }
.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links > li { position: relative; }
.nav-links a.nav-link {
  font-family: var(--mono); font-size: 13px; color: var(--ink);
  padding: 10px 14px; border-radius: 8px; display: inline-block;
}
.nav-links a.nav-link:hover { background: var(--paper); color: var(--forest-deep); }
.nav-links a.nav-link.active { color: var(--forest); }
.nav-list { display: flex; align-items: center; gap: 2px; list-style: none; }
.nav-cta { display: flex; align-items: center; gap: 10px; }
.nav-toggle { display: none; }

.dropdown { position: relative; }
.dropdown-panel {
  position: absolute; top: calc(100% + 10px); left: 50%; transform: translateX(-50%);
  background: var(--cream); border: 1px solid var(--rule); border-radius: var(--radius);
  padding: 14px; min-width: 260px; box-shadow: 0 16px 40px rgba(20,30,20,0.12);
  opacity: 0; visibility: hidden; transform: translateX(-50%) translateY(6px);
  transition: all .16s ease;
}
.dropdown:hover .dropdown-panel { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.dropdown-panel a { display: block; padding: 10px 12px; border-radius: 8px; font-family: var(--mono); font-size: 12.5px; color: var(--ink); }
.dropdown-panel a:hover { background: var(--paper); color: var(--forest-deep); }
.dropdown-panel a small { display: block; font-family: var(--sans); color: var(--muted); font-size: 11.5px; font-weight: 400; margin-top: 2px; }

/* ---- Hero ---- */
.hero {
  padding: 88px 0 72px;
  background:
    radial-gradient(720px 420px at 88% -8%, oklch(0.58 0.09 130 / 0.16), transparent 60%),
    var(--cream);
  position: relative; overflow: hidden;
}
.hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center; }
.hero h1 { margin-bottom: 20px; }
.hero .lede { margin-bottom: 32px; }
.hero-stats { display: flex; gap: 36px; margin-top: 48px; flex-wrap: wrap; }
.hero-stat .num { font-family: var(--mono); font-size: 30px; font-weight: 600; color: var(--forest-deep); }
.hero-stat .label { font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--soil); margin-top: 4px; }

.hero-art {
  aspect-ratio: 1/1; border-radius: 20px; background: var(--forest);
  position: relative; overflow: hidden; display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--rule-dark);
}
.hero-art .node-ring { position: absolute; border: 1px solid rgba(255,255,255,0.14); border-radius: 50%; }
.hero-art .ring1 { width: 78%; height: 78%; }
.hero-art .ring2 { width: 52%; height: 52%; }
.hero-art .core { font-family: var(--mono); color: var(--cream); text-align: center; z-index: 2; padding: 20px; }
.hero-art .core .icon { font-size: 30px; margin-bottom: 8px; }
.hero-art .core .t1 { font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--sage); }
.hero-art .core .t2 { font-size: 15px; margin-top: 6px; line-height: 1.4; max-width: 200px; }
.hero-art .node {
  position: absolute; background: var(--cream); border-radius: 999px; padding: 7px 13px;
  font-family: var(--mono); font-size: 11px; color: var(--forest-deep); box-shadow: 0 8px 20px rgba(0,0,0,0.18);
  display: flex; align-items: center; gap: 6px;
}

/* ---- Sections ---- */
section { padding: 88px 0; }
.section-tight { padding: 56px 0; }
.section-head { max-width: 660px; margin-bottom: 48px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.bg-paper { background: var(--paper); }
.bg-forest { background: var(--forest); color: var(--cream); }
.bg-forest h2, .bg-forest h3, .bg-forest h4 { color: var(--cream); }
.bg-forest .eyebrow { color: var(--sage); }
.bg-forest .eyebrow::before { background: var(--sage); }
.bg-forest p { color: oklch(0.92 0.02 130 / 0.82); }
.bg-ink { background: var(--ink); color: var(--cream); }

/* ---- Grids & Cards ---- */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }

.card {
  background: var(--cream); border: 1px solid var(--rule); border-radius: var(--radius);
  padding: 28px; transition: all .18s ease;
}
.card:hover { border-color: var(--moss); transform: translateY(-3px); box-shadow: 0 14px 30px rgba(30,50,30,0.08); }
.card .icon-tile {
  width: 44px; height: 44px; border-radius: 10px; background: var(--paper);
  display: flex; align-items: center; justify-content: center; font-size: 20px; margin-bottom: 18px;
  border: 1px solid var(--rule);
}
.card h3 { margin-bottom: 8px; }
.card p { font-size: 14.5px; margin-bottom: 0; }
.card .tag { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--soil); margin-bottom: 10px; display: block; }

.pillar-card { position: relative; padding-top: 30px; }
.pillar-card .pillar-index { font-family: var(--mono); font-size: 12px; color: var(--sage); position: absolute; top: 24px; right: 24px; }

/* stat band */
.stat-band { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--rule-dark); border-bottom: 1px solid var(--rule-dark); }
.stat-cell { padding: 34px 24px; border-right: 1px solid var(--rule-dark); }
.stat-cell:last-child { border-right: none; }
.stat-cell .num { font-family: var(--mono); font-size: 34px; font-weight: 600; color: var(--cream); }
.stat-cell .label { font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.04em; color: var(--sage); margin-top: 8px; line-height: 1.4; }

/* Ecosystem diagram */
.eco-wrap { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; align-items: stretch; }
.eco-col { display: flex; flex-direction: column; gap: 16px; }
.eco-box {
  border: 1px solid var(--rule); border-radius: var(--radius-sm); padding: 16px 18px; background: var(--cream);
  border-left: 3px solid var(--moss);
}
.eco-box h4 { color: var(--forest-deep); margin-bottom: 4px; font-size: 13.5px; text-transform: none; letter-spacing: 0; }
.eco-box p { font-size: 13px; margin: 0; color: var(--muted); }
.eco-core {
  grid-column: 2; background: var(--forest); border-radius: var(--radius); padding: 26px 22px;
  display: flex; flex-direction: column; justify-content: center; text-align: center; color: var(--cream);
  border: 1px solid var(--rule-dark);
}
.eco-core h3 { color: var(--cream); margin-bottom: 10px; }
.eco-core p { color: oklch(0.92 0.02 130 / 0.85); font-size: 13px; }

/* Case study */
.cs-card {
  display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 0; border: 1px solid var(--rule); border-radius: var(--radius);
  overflow: hidden; background: var(--cream);
}
.cs-media { background: var(--forest); padding: 40px 34px; display: flex; flex-direction: column; justify-content: space-between; color: var(--cream); }
.cs-media .cs-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 28px; }
.cs-media .cs-stats .num { font-family: var(--mono); font-size: 24px; font-weight: 600; }
.cs-media .cs-stats .label { font-family: var(--mono); font-size: 10.5px; color: var(--sage); margin-top: 4px; letter-spacing: 0.03em; }
.cs-body { padding: 40px 36px; }
.cs-body ul { list-style: none; margin: 18px 0 0; }
.cs-body ul li { font-size: 14.5px; color: var(--muted); padding: 9px 0; border-top: 1px solid var(--rule); display: flex; gap: 10px; }
.cs-body ul li::before { content: "→"; color: var(--moss); font-family: var(--mono); flex-shrink: 0; }

/* Logo strip */
.logo-strip { display: flex; flex-wrap: wrap; gap: 40px; align-items: center; justify-content: space-between; opacity: 0.85; }
.logo-strip span { font-family: var(--mono); font-size: 13px; color: var(--soil); letter-spacing: 0.04em; border: 1px solid var(--rule); padding: 8px 16px; border-radius: 999px; }

/* Quote */
.quote-block { border-left: 3px solid var(--moss); padding-left: 26px; }
.quote-block p.q { font-family: var(--mono); font-size: 20px; color: var(--forest-deep); line-height: 1.5; margin-bottom: 16px; }
.quote-block .who { font-size: 13px; color: var(--muted); }

/* CTA band */
.cta-band { border-radius: 20px; background: var(--forest); padding: 64px; text-align: center; color: var(--cream); }
.cta-band h2 { color: var(--cream); }
.cta-band p { color: oklch(0.92 0.02 130 / 0.85); max-width: 520px; margin-left: auto; margin-right: auto; }
.cta-band .btn-row { justify-content: center; margin-top: 26px; }

/* Table */
table.pricing { width: 100%; border-collapse: collapse; font-size: 13.5px; }
table.pricing th, table.pricing td { border: 1px solid var(--rule); padding: 10px 12px; text-align: left; }
table.pricing th { font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--soil); background: var(--paper); }

/* Timeline */
.timeline { border-left: 2px solid var(--rule); margin-left: 8px; }
.timeline-item { position: relative; padding: 4px 0 32px 28px; }
.timeline-item::before { content: ""; position: absolute; left: -7px; top: 6px; width: 12px; height: 12px; border-radius: 50%; background: var(--moss); border: 3px solid var(--cream); box-shadow: 0 0 0 1px var(--rule); }
.timeline-item h4 { color: var(--forest-deep); text-transform: none; letter-spacing: 0; font-size: 15px; margin-bottom: 4px; }

/* Numbered list */
.step-list { counter-reset: step; }
.step-item { counter-increment: step; position: relative; padding-left: 52px; margin-bottom: 30px; }
.step-item::before {
  content: counter(step, decimal-leading-zero); font-family: var(--mono); font-size: 13px; color: var(--cream);
  background: var(--forest); width: 34px; height: 34px; border-radius: 8px; display: flex; align-items: center; justify-content: center;
  position: absolute; left: 0; top: 0;
}

/* Form */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field.full { grid-column: 1 / -1; }
.field label { font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--soil); }
.field input, .field select, .field textarea {
  font-family: var(--sans); font-size: 14.5px; padding: 12px 14px; border: 1px solid var(--rule); border-radius: 8px;
  background: var(--cream); color: var(--ink);
}
.field textarea { resize: vertical; min-height: 110px; }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--moss); }

/* Footer */
.site-footer { background: var(--ink); color: oklch(0.9 0.01 130); padding: 64px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr; gap: 32px; margin-bottom: 48px; }
.footer-grid h4 { color: var(--sage); margin-bottom: 16px; }
.footer-grid ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-grid a { font-size: 13.5px; color: oklch(0.82 0.01 130); }
.footer-grid a:hover { color: var(--sage); }
.footer-brand p { color: oklch(0.7 0.01 130); font-size: 13.5px; max-width: 280px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 24px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.footer-bottom span { font-family: var(--mono); font-size: 11.5px; color: oklch(0.55 0.01 130); }
.footer-bottom .flinks { display: flex; gap: 20px; }
.footer-bottom .flinks a { font-family: var(--mono); font-size: 11.5px; color: oklch(0.6 0.01 130); }

/* Page hero (interior pages) */
.page-hero { padding: 60px 0 56px; background: var(--paper); border-bottom: 1px solid var(--rule); }
.page-hero .lede { margin-top: 6px; }
.breadcrumb { font-family: var(--mono); font-size: 12px; color: var(--soil); margin-bottom: 16px; }
.breadcrumb a:hover { color: var(--forest); }

.badge { display: inline-block; font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.08em; text-transform: uppercase; padding: 4px 10px; border-radius: 999px; border: 1px solid var(--rule); color: var(--soil); margin-bottom: 10px; }

/* Persona / role cards */
.role-card { border: 1px solid var(--rule); border-radius: var(--radius); overflow: hidden; }
.role-card .role-head { padding: 26px 26px 20px; border-bottom: 1px solid var(--rule); }
.role-card .role-body { padding: 22px 26px 26px; }
.role-card .role-body ul { list-style: none; }
.role-card .role-body li { font-size: 14px; color: var(--muted); padding: 7px 0; display: flex; gap: 8px; }
.role-card .role-body li::before { content: "✓"; color: var(--moss); font-family: var(--mono); flex-shrink: 0; }

/* Responsive */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-art { max-width: 420px; margin: 0 auto; }
  .grid-3, .grid-4, .grid-5 { grid-template-columns: repeat(2, 1fr); }
  .stat-band { grid-template-columns: repeat(2, 1fr); }
  .stat-cell:nth-child(2) { border-right: none; }
  .cs-card { grid-template-columns: 1fr; }
  .eco-wrap { grid-template-columns: 1fr; }
  .eco-core { grid-column: 1; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .form-grid { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .nav-links { display: none; position: absolute; top: 100%; left: 0; right: 0; background: var(--cream); border-bottom: 1px solid var(--rule); flex-direction: column; align-items: stretch; padding: 10px 20px 20px; gap: 4px; }
  .nav-links.nav-links--open { display: flex; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 2px; }
  .dropdown-panel { position: static; transform: none; opacity: 1; visibility: visible; box-shadow: none; border: none; padding: 0 0 0 12px; display: none; }
  .dropdown:hover .dropdown-panel, .dropdown.open .dropdown-panel { display: block; }
  .nav-cta { flex-direction: column; align-items: stretch; margin-top: 10px; }
  .nav-cta .btn-outline { display: inline-flex; }
  .nav-toggle { display: block; }
  .grid-2, .grid-3, .grid-4, .grid-5 { grid-template-columns: 1fr; }
  .cta-band { padding: 44px 26px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  section { padding: 56px 0; }
}
@media (min-width: 721px) {
  .nav-toggle { display: none; }
}