/* ═══════════════════════════════════════════
   INVERSION GROUP - SHARED STYLES
   Exact kevinfrench.com tokens, distinct layout
═══════════════════════════════════════════ */

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg:            #FAFAF8;
  --surface:       #F2F1EE;
  --surface-hover: #EAEAE7;
  --text:          #0A0A0A;
  --text-mid:      #444444;
  --text-dim:      #888888;
  --border:        rgba(0,0,0,0.09);
  --border-solid:  #E2E1DE;
  --dark-bg:       #0A0A0A;
  --dark-surface:  #111111;
  --dark-white:    #EDEDED;
  --dark-mid:      #AAAAAA;
  --dark-dim:      #666666;
  --dark-border:   rgba(255,255,255,0.06);
  --dark-grid:     rgba(255,255,255,0.04);
  --red:           #DB143B;
  --red-hover:     #B8102F;
  --rail:          280px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Archivo', sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  display: flex;
  min-height: 100vh;
}

/* ── RAIL ── */
#rail {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: var(--rail);
  background: var(--dark-bg);
  border-right: 1px solid var(--dark-border);
  display: flex;
  flex-direction: column;
  padding: 36px 32px;
  z-index: 100;
}

.rail-logo {
  font-family: 'Archivo', sans-serif;
  font-size: 13px; font-weight: 800;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--dark-white); text-decoration: none;
  margin-bottom: 3px;
}

.rail-gtm { color: var(--red); }

.rail-sub {
  font-family: 'Geist Mono', monospace;
  font-size: 10px; font-weight: 500;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--dark-dim); margin-bottom: 36px;
}

.rail-thesis {
  font-family: 'Instrument Serif', serif;
  font-style: italic;
  font-size: 14px; line-height: 1.65;
  color: var(--dark-mid);
  padding-bottom: 28px;
  border-bottom: 1px solid var(--dark-border);
  margin-bottom: 28px;
}

.rail-thesis strong {
  font-family: 'Archivo', sans-serif;
  font-style: normal; font-weight: 700;
  color: var(--dark-white);
}

nav {
  display: flex; flex-direction: column;
  gap: 2px; flex: 1;
}

nav a {
  font-family: 'Geist Mono', monospace;
  font-size: 11px; font-weight: 500;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--dark-dim); text-decoration: none;
  padding: 9px 12px;
  border-left: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

nav a:hover { color: var(--dark-white); background: var(--dark-grid); }
nav a.active { color: var(--dark-white); border-left-color: var(--red); }

.rail-bottom {
  margin-top: auto;
  padding-top: 28px;
  border-top: 1px solid var(--dark-border);
}

.rail-bottom-label {
  font-family: 'Geist Mono', monospace;
  font-size: 10px; font-weight: 500;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--dark-dim); margin-bottom: 10px;
}

.btn-rail {
  display: block;
  background: var(--red); color: white;
  font-family: 'Archivo', sans-serif;
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
  padding: 10px 14px; text-decoration: none;
  text-align: center; transition: background 0.2s;
  margin-bottom: 12px;
}

.btn-rail:hover { background: var(--red-hover); }

.rail-contact {
  font-family: 'Geist Mono', monospace;
  font-size: 10px; color: var(--dark-dim);
  letter-spacing: 0.04em; line-height: 1.9;
}

.rail-contact a { color: var(--dark-dim); text-decoration: none; transition: color 0.2s; }
.rail-contact a:hover { color: var(--dark-white); }

/* ── MAIN ── */
#main { margin-left: var(--rail); flex: 1; min-height: 100vh; }

/* ── PANELS ── */
.panel        { padding: 64px 72px; border-bottom: 1px solid var(--border-solid); background: var(--bg); }
.panel-surface{ padding: 64px 72px; border-bottom: 1px solid var(--border-solid); background: var(--surface); }
.panel-dark   { padding: 64px 72px; border-bottom: 1px solid var(--dark-border);  background: var(--dark-bg); }
.panel-red    { padding: 56px 72px; background: var(--red); }

/* ── TYPOGRAPHY ── */
.mono-label {
  font-family: 'Geist Mono', monospace;
  font-size: 10px; font-weight: 500;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--text-dim); margin-bottom: 6px;
}

.mono-label-light {
  font-family: 'Geist Mono', monospace;
  font-size: 10px; font-weight: 500;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--dark-dim); margin-bottom: 6px;
}

.mono-label-red {
  font-family: 'Geist Mono', monospace;
  font-size: 10px; font-weight: 500;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--red); margin-bottom: 6px;
  display: flex; align-items: center; gap: 10px;
}

.mono-label-red::before {
  content: ''; display: block;
  width: 18px; height: 1px; background: var(--red); flex-shrink: 0;
}

.panel-h2 {
  font-family: 'Archivo', sans-serif;
  font-size: clamp(28px, 3vw, 40px); font-weight: 900;
  letter-spacing: -0.02em; text-transform: uppercase;
  color: var(--text); line-height: 1.05; margin-bottom: 40px;
}

.panel-h2-light {
  font-family: 'Archivo', sans-serif;
  font-size: clamp(28px, 3vw, 40px); font-weight: 900;
  letter-spacing: -0.02em; text-transform: uppercase;
  color: var(--dark-white); line-height: 1.05; margin-bottom: 40px;
}

.serif-italic {
  font-family: 'Instrument Serif', serif;
  font-style: italic;
}

/* ── BUTTONS ── */
.btn-red {
  display: inline-block;
  background: var(--red); color: white;
  font-family: 'Archivo', sans-serif;
  font-size: 12px; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
  padding: 12px 24px; text-decoration: none;
  transition: background 0.2s;
}

.btn-red:hover { background: var(--red-hover); }

.btn-outline {
  display: inline-block;
  background: transparent; color: var(--text);
  font-family: 'Archivo', sans-serif;
  font-size: 12px; font-weight: 600;
  letter-spacing: 0.06em; text-transform: uppercase;
  padding: 11px 24px; text-decoration: none;
  border: 1px solid var(--border-solid);
  transition: background 0.2s, border-color 0.2s;
}

.btn-outline:hover { background: var(--surface-hover); border-color: var(--text); }

.btn-ghost {
  font-family: 'Arquivo', sans-serif;
  font-family: 'Archivo', sans-serif;
  font-size: 12px; font-weight: 600;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--text-mid); text-decoration: none;
  border-bottom: 1px solid var(--border-solid); padding-bottom: 2px;
  transition: color 0.2s, border-color 0.2s;
}

.btn-ghost:hover { color: var(--text); border-color: var(--text); }

/* ── QUOTE BAND ── */
.panel-red blockquote {
  font-family: 'Instrument Serif', serif; font-style: italic;
  font-size: clamp(22px, 3vw, 34px); color: white;
  line-height: 1.45; max-width: 760px;
}

.panel-red blockquote strong {
  font-family: 'Archivo', sans-serif;
  font-style: normal; font-weight: 800;
}

/* ── OFFERING CARDS (2×2 grid) ── */
.offerings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  background: var(--border-solid);
  border: 1px solid var(--border-solid);
  margin-top: 40px;
}

.offer-card {
  background: var(--bg);
  padding: 36px 32px;
  position: relative;
  text-decoration: none; color: inherit;
  transition: background 0.2s;
  display: flex; flex-direction: column;
}

.offer-card:hover { background: var(--surface-hover); }

.offer-card:hover .offer-arrow { color: var(--red); transform: translate(3px,-3px); }

.offer-arrow {
  position: absolute; top: 28px; right: 28px;
  font-size: 16px; color: var(--border-solid);
  transition: color 0.2s, transform 0.2s;
}

.offer-label {
  font-family: 'Geist Mono', monospace;
  font-size: 10px; font-weight: 500;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--red); margin-bottom: 14px;
}

.offer-title {
  font-family: 'Archivo', sans-serif;
  font-size: 20px; font-weight: 800;
  letter-spacing: -0.02em; color: var(--text);
  margin-bottom: 10px; text-transform: uppercase;
  line-height: 1.1;
}

.offer-body {
  font-size: 14px; line-height: 1.65;
  color: var(--text-mid); flex: 1; margin-bottom: 20px;
}

.offer-meta {
  font-family: 'Geist Mono', monospace;
  font-size: 11px; font-weight: 500; color: var(--text-dim);
  border-top: 1px solid var(--border-solid); padding-top: 14px;
  letter-spacing: 0.04em;
}

.offer-meta span { color: var(--red); font-weight: 600; }

/* ── BOOKS STRIP ── */
.books-strip {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 1px; background: var(--border-solid);
  border: 1px solid var(--border-solid); margin-top: 2px;
}

.book-cell {
  background: var(--surface); padding: 28px 28px;
}

.book-num {
  font-family: 'Geist Mono', monospace;
  font-size: 10px; color: var(--text-dim);
  letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 10px;
}

.book-title {
  font-family: 'Archivo', sans-serif;
  font-size: 16px; font-weight: 800;
  letter-spacing: -0.01em; color: var(--text); margin-bottom: 8px;
}

.book-desc {
  font-family: 'Instrument Serif', serif;
  font-style: italic; font-size: 13px;
  color: var(--text-mid); line-height: 1.55;
}

/* ── CAREER STRIP ── */
.career-strip {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--border-solid);
  margin-top: 48px;
}

.career-cell {
  padding: 20px 24px 20px 0;
  border-right: 1px solid var(--border-solid);
}

.career-cell:last-child { border-right: none; }

.career-co {
  font-family: 'Archivo', sans-serif;
  font-size: 13px; font-weight: 700;
  color: var(--text); margin-bottom: 3px;
}

.career-role { font-size: 12px; color: var(--text-dim); line-height: 1.4; }

/* ── PRINCIPLES GRID ── */
.principles-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0;
}

.princ {
  padding: 32px 40px 32px 0;
  border-bottom: 1px solid var(--border-solid);
}

.princ:nth-child(even) {
  padding: 32px 0 32px 40px;
  border-left: 1px solid var(--border-solid);
}

.princ:nth-last-child(-n+2) { border-bottom: none; }

.princ-n {
  font-family: 'Geist Mono', monospace;
  font-size: 10px; color: var(--text-dim);
  letter-spacing: 0.1em; margin-bottom: 10px;
}

.princ-text {
  font-family: 'Instrument Serif', serif;
  font-style: italic; font-size: 15px;
  line-height: 1.72; color: var(--text-mid);
}

.princ-text strong {
  font-family: 'Archivo', sans-serif;
  font-style: normal; font-weight: 600; color: var(--text);
}

.princ-text a { color: var(--red); text-decoration: none; }

/* ── WHO LIST ── */
.who-list { border-top: 2px solid var(--text); }

.who-item {
  display: grid; grid-template-columns: 56px 1fr;
  gap: 24px; padding: 28px 0;
  border-bottom: 1px solid var(--border-solid);
  align-items: start;
}

.who-n {
  font-family: 'Archivo', sans-serif;
  font-size: 28px; font-weight: 900;
  color: var(--border-solid); line-height: 1.1; letter-spacing: -0.03em;
}

.who-h {
  font-family: 'Archivo', sans-serif;
  font-size: 16px; font-weight: 700;
  color: var(--text); margin-bottom: 6px; letter-spacing: -0.01em;
}

.who-b { font-size: 14px; line-height: 1.65; color: var(--text-mid); }

/* ── PROCESS ROWS ── */
.process-list { border-top: 2px solid var(--dark-white); }

.process-row {
  display: grid; grid-template-columns: 48px 1fr auto;
  gap: 28px; align-items: start;
  padding: 28px 0; border-bottom: 1px solid var(--dark-border);
}

.process-n {
  font-family: 'Archivo', sans-serif;
  font-size: 40px; font-weight: 900;
  color: var(--dark-grid); line-height: 1; letter-spacing: -0.04em;
}

.process-h {
  font-family: 'Archivo', sans-serif;
  font-size: 15px; font-weight: 800;
  text-transform: uppercase; letter-spacing: 0.02em;
  color: var(--dark-white); margin-bottom: 8px;
}

.process-b { font-size: 13px; line-height: 1.65; color: var(--dark-dim); }

.process-tag {
  font-family: 'Geist Mono', monospace;
  font-size: 10px; font-weight: 500; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--red);
  border: 1px solid rgba(219,20,59,0.3);
  padding: 4px 10px; white-space: nowrap; align-self: start; margin-top: 4px;
}

/* ── STAT ROW ── */
.stat-row {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--border-solid); margin-top: 48px;
}

.stat-cell {
  padding: 24px 0; border-right: 1px solid var(--border-solid);
  padding-right: 28px;
}

.stat-cell:last-child { border-right: none; }

.stat-n {
  font-family: 'Archivo', sans-serif;
  font-size: 40px; font-weight: 900; letter-spacing: -0.03em;
  color: var(--text); line-height: 1; margin-bottom: 4px;
}

.stat-n .r { color: var(--red); }
.stat-l { font-family: 'Geist Mono', monospace; font-size: 10px; color: var(--text-dim); letter-spacing: 0.08em; text-transform: uppercase; }

/* ── CTA SPLIT ── */
.cta-split {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 72px; align-items: center;
}

.cta-h {
  font-family: 'Archivo', sans-serif;
  font-size: clamp(26px, 3vw, 38px); font-weight: 900;
  text-transform: uppercase; letter-spacing: -0.02em;
  color: var(--text); line-height: 1.05; margin-bottom: 14px;
}

.cta-p {
  font-family: 'Instrument Serif', serif; font-style: italic;
  font-size: 17px; color: var(--text-mid); line-height: 1.6;
}

.cta-actions { display: flex; flex-direction: column; gap: 10px; }

.cta-note {
  font-family: 'Geist Mono', monospace; font-size: 10px;
  color: var(--text-dim); text-align: center; letter-spacing: 0.04em;
  margin-top: 4px;
}

.cta-note a { color: var(--red); text-decoration: none; }

/* ── FOOTER ── */
footer {
  background: var(--dark-bg); padding: 32px 72px 28px;
  border-top: 1px solid var(--dark-border);
}

.footer-top {
  display: flex; justify-content: space-between; align-items: baseline;
  flex-wrap: wrap; gap: 16px; padding-bottom: 18px;
  border-bottom: 1px solid var(--dark-border); margin-bottom: 14px;
}

.footer-brand {
  font-family: 'Archivo', sans-serif; font-size: 13px; font-weight: 700;
  color: var(--dark-white); letter-spacing: 0.02em;
}

.footer-brand span { font-weight: 400; color: var(--dark-dim); font-size: 11px; margin-left: 10px; }

.footer-links { display: flex; gap: 20px; flex-wrap: wrap; }

.footer-links a {
  font-family: 'Geist Mono', monospace; font-size: 10px; font-weight: 500;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--dark-dim); text-decoration: none; transition: color 0.2s;
}

.footer-links a:hover { color: var(--dark-white); }

.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

.footer-copy { font-family: 'Geist Mono', monospace; font-size: 10px; color: var(--dark-dim); letter-spacing: 0.04em; }

/* ── REVEAL ── */
.reveal { opacity: 0; transform: translateY(12px); transition: opacity 0.45s ease, transform 0.45s ease; }
.reveal.visible { opacity: 1; transform: none; }
.rv1 { transition-delay: 0.07s; }
.rv2 { transition-delay: 0.14s; }
.rv3 { transition-delay: 0.21s; }

/* ── INNER PAGE HERO ── */
.page-hero {
  background: var(--dark-bg);
  padding: 64px 72px 56px;
  border-bottom: 1px solid var(--dark-border);
}

.page-hero-eyebrow {
  font-family: 'Geist Mono', monospace; font-size: 10px; font-weight: 500;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--red);
  margin-bottom: 16px; display: flex; align-items: center; gap: 10px;
}

.page-hero-eyebrow::before {
  content: ''; display: block; width: 18px; height: 1px; background: var(--red);
}

.page-hero h1 {
  font-family: 'Archivo', sans-serif;
  font-size: clamp(40px, 5vw, 68px); font-weight: 900;
  letter-spacing: -0.03em; text-transform: uppercase;
  color: var(--dark-white); line-height: 1.0; margin-bottom: 20px;
}

.page-hero-sub {
  font-family: 'Instrument Serif', serif; font-style: italic;
  font-size: clamp(17px, 2vw, 21px); color: var(--dark-mid);
  max-width: 560px; line-height: 1.5;
}

/* ── NUMBERED FEATURES ── */
.feature-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 2px;
  background: var(--border-solid); border: 1px solid var(--border-solid);
}

.feature-cell {
  background: var(--bg); padding: 32px 28px;
}

.feature-n {
  font-family: 'Geist Mono', monospace; font-size: 10px;
  color: var(--red); letter-spacing: 0.1em; margin-bottom: 10px;
}

.feature-h {
  font-family: 'Archivo', sans-serif; font-size: 16px; font-weight: 700;
  color: var(--text); margin-bottom: 8px; letter-spacing: -0.01em;
}

.feature-b { font-size: 14px; line-height: 1.65; color: var(--text-mid); }

/* ── DARK FEATURE GRID ── */
.feature-grid-dark {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1px;
  background: var(--dark-border); border: 1px solid var(--dark-border);
}

.feature-cell-dark { background: var(--dark-bg); padding: 32px 28px; }
.feature-n-dark { font-family: 'Geist Mono', monospace; font-size: 10px; color: var(--red); letter-spacing: 0.1em; margin-bottom: 10px; }
.feature-h-dark { font-family: 'Archivo', sans-serif; font-size: 15px; font-weight: 700; color: var(--dark-white); margin-bottom: 8px; }
.feature-b-dark { font-size: 13px; line-height: 1.65; color: var(--dark-dim); }

/* ── PIPELINE STAGES ── */
.stages { display: grid; grid-template-columns: repeat(6, 1fr); gap: 1px; background: var(--border-solid); border: 1px solid var(--border-solid); }
.stage { background: var(--bg); padding: 24px 16px; }
.stage-n { font-family: 'Geist Mono', monospace; font-size: 9px; color: var(--red); letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 8px; }
.stage-name { font-family: 'Archivo', sans-serif; font-size: 13px; font-weight: 800; color: var(--text); text-transform: uppercase; margin-bottom: 6px; letter-spacing: 0.02em; }
.stage-def { font-size: 12px; line-height: 1.55; color: var(--text-mid); }

/* ── MOBILE ── */
@media (max-width: 900px) {
  body { display: block; }
  #rail {
    position: relative; width: 100%; height: auto;
    flex-direction: row; flex-wrap: wrap;
    padding: 16px 24px; gap: 0;
    border-right: none; border-bottom: 1px solid var(--dark-border);
    align-items: center; justify-content: space-between;
  }
  .rail-thesis, .rail-bottom { display: none; }
  .rail-sub { margin-bottom: 0; }
  nav { flex-direction: row; flex-wrap: wrap; gap: 0; margin-top: 8px; }
  nav a { padding: 6px 10px; font-size: 10px; border-left: none; border-bottom: 2px solid transparent; }
  nav a.active { border-left-color: transparent; border-bottom-color: var(--red); }
  #main { margin-left: 0; }
  .panel, .panel-surface, .panel-dark, .panel-red { padding: 44px 24px; }
  .offerings-grid { grid-template-columns: 1fr; }
  .books-strip { grid-template-columns: 1fr; }
  .career-strip { grid-template-columns: 1fr 1fr; }
  .principles-grid { grid-template-columns: 1fr; }
  .princ:nth-child(even) { padding: 32px 0; border-left: none; }
  .cta-split { grid-template-columns: 1fr; gap: 32px; }
  .feature-grid, .feature-grid-dark { grid-template-columns: 1fr; }
  .stages { grid-template-columns: repeat(3, 1fr); }
  .stat-row { grid-template-columns: 1fr 1fr; }
  .process-row { grid-template-columns: 40px 1fr; }
  .process-tag { display: none; }
  footer { padding: 28px 24px; }
  .page-hero { padding: 44px 24px 40px; }
}