/* ============================================================
   SOLO BUSINESS MASTER BRAND v1.0
   Source of truth: https://expertflow-aios.vercel.app/
   Apply to ALL Expert Flow learning sites.
   ============================================================ */

@font-face {
  font-family: "Instrument Sans Fallback";
  src: local("Arial");
  ascent-override: 94.42%;
  descent-override: 24.33%;
  line-gap-override: 0%;
  size-adjust: 102.74%;
}

:root {
  /* Typography stack — IDENTICAL to etalon */
  --font-sans: "Instrument Sans", "Instrument Sans Fallback", system-ui, sans-serif;
  --font-display: "Instrument Serif", Georgia, serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  /* Color tokens — IDENTICAL to etalon */
  --color-background: #070709;
  --color-foreground: #dfdeda;
  --color-foreground-soft: rgba(223, 222, 218, 0.65);
  --color-foreground-muted: rgba(223, 222, 218, 0.62);
  --color-foreground-dim: rgba(223, 222, 218, 0.30);
  --color-border: rgba(223, 222, 218, 0.08);
  --color-border-strong: rgba(223, 222, 218, 0.14);
  --color-surface: #0d0d0f;

  --color-accent-rose:   #eac7c8;
  --color-accent-violet: #c0c0e7;
  --color-accent-sky:    #b9d5ed;
  --color-accent-mint:   #c0d8cc;
  --color-accent-coral:  #e3bdb9;
  --color-accent-cream:  #e3d5c6;

  /* Legacy compat — old sites may still reference these */
  --bg-page: var(--color-background);
  --accent: var(--color-accent-violet);
  --text: var(--color-foreground);
  --text-dim: var(--color-foreground-muted);
  --border-cell: var(--color-border-strong);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-background);
  color: var(--color-foreground);
  font-family: var(--font-sans);
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* GRAIN texture overlay — visible noise on every page */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.04;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0.6 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}
body > * { position: relative; z-index: 2; }

/* TYPOGRAPHY UTILITY */
.font-display { font-family: var(--font-display); font-style: italic; }
.font-sans    { font-family: var(--font-sans); }
.font-mono    { font-family: var(--font-mono); }

/* Headings — etalon size scale */
h1, .h1 {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(3rem, 7vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin: 0 0 1.5rem;
  color: var(--color-foreground);
}
h2, .h2 {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 3.5rem 0 1.25rem;
  color: var(--color-foreground);
}
h3, .h3 {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 1.25rem;
  line-height: 1.4;
  margin: 2.2rem 0 0.75rem;
  color: var(--color-foreground);
}

p { line-height: 1.65; color: var(--color-foreground-soft); margin: 0 0 1em; max-width: 68ch; }

strong { font-weight: 600; color: inherit; }   /* bold = weight only, no accent */
em     { font-family: var(--font-display); font-style: italic; color: var(--color-accent-violet); font-weight: 400; }

a { color: var(--color-foreground); text-decoration: none; border-bottom: 1px solid var(--color-border-strong); transition: border-color 0.2s, color 0.2s; }
a:hover { color: var(--color-accent-violet); border-color: var(--color-accent-violet); }

/* EYEBROW — uniform across the brand */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--color-foreground-muted);
}
.eyebrow .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--color-accent-violet);
  box-shadow: 0 0 12px rgba(192, 192, 231, 0.5);
}

/* EM colored italic spans — 6 accent variants */
.em-rose   { color: var(--color-accent-rose);   font-family: var(--font-display); font-style: italic; }
.em-violet { color: var(--color-accent-violet); font-family: var(--font-display); font-style: italic; }
.em-sky    { color: var(--color-accent-sky);    font-family: var(--font-display); font-style: italic; }
.em-mint   { color: var(--color-accent-mint);   font-family: var(--font-display); font-style: italic; }
.em-coral  { color: var(--color-accent-coral);  font-family: var(--font-display); font-style: italic; }
.em-cream  { color: var(--color-accent-cream);  font-family: var(--font-display); font-style: italic; }

/* BG-GLOW variants — radial gradient backgrounds */
.bg-glow-violet { background: radial-gradient(ellipse 80% 60% at 50% 40%, rgba(192,192,231,0.10), transparent 70%), var(--color-surface); }
.bg-glow-rose   { background: radial-gradient(ellipse 80% 60% at 50% 40%, rgba(234,199,200,0.10), transparent 70%), var(--color-surface); }
.bg-glow-sky    { background: radial-gradient(ellipse 80% 60% at 50% 40%, rgba(185,213,237,0.10), transparent 70%), var(--color-surface); }
.bg-glow-mint   { background: radial-gradient(ellipse 80% 60% at 50% 40%, rgba(192,216,204,0.10), transparent 70%), var(--color-surface); }
.bg-glow-cream  { background: radial-gradient(ellipse 80% 60% at 50% 40%, rgba(227,213,198,0.08), transparent 70%), var(--color-surface); }

/* CELL-BORDERED GRID — the signature etalon layout */
.cell-grid {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--color-border-strong);
  border-left: 1px solid var(--color-border-strong);
}
.cell-grid > * {
  border-right: 1px solid var(--color-border-strong);
  border-bottom: 1px solid var(--color-border-strong);
  padding: 2.5rem;
  transition: background-color 0.2s;
}
.cell-grid > a:hover,
.cell-grid > .cell:hover {
  background: rgba(223, 222, 218, 0.02);
  border-bottom-color: var(--color-border-strong);
}

/* BRAND-BAR — top of every page */
.brand-bar {
  position: relative;
  z-index: 5;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--color-foreground-muted);
  text-decoration: none;
  border: none;
  border-bottom: 1px solid var(--color-border-strong);
  width: 100%;
}
.brand-bar:hover { color: var(--color-foreground); border-color: var(--color-border-strong); }
.brand-bar .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--color-accent-violet); box-shadow: 0 0 12px rgba(192,192,231,0.5); }

/* CTA — lavender glow button */
.cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: var(--color-accent-violet);
  color: var(--color-background);
  border: 1px solid var(--color-accent-violet);
  border-radius: 0;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: box-shadow 0.3s, transform 0.2s;
  box-shadow: 0 0 0 rgba(192, 192, 231, 0);
}
.cta:hover {
  box-shadow: 0 0 32px rgba(192, 192, 231, 0.35);
  transform: translateY(-1px);
}
.cta-ghost {
  background: transparent;
  color: var(--color-foreground);
  border: 1px solid var(--color-border-strong);
}
.cta-ghost:hover { border-color: var(--color-accent-violet); color: var(--color-accent-violet); box-shadow: none; }

/* CALLOUT — discreet content emphasis */
.callout {
  border-left: 3px solid var(--color-accent-violet);
  background: rgba(192, 192, 231, 0.04);
  padding: 1rem 1.5rem;
  margin: 2rem 0;
  border-radius: 0 4px 4px 0;
}
.callout strong { color: var(--color-accent-violet); }

/* ============================================================
   KEYFRAMES — etalon animations
   ============================================================ */
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes pulse-glow {
  0%, 100% { opacity: 0.45; }
  50%      { opacity: 0.70; }
}

.animate-fade-in       { animation: 0.6s ease-out backwards fadeIn; }
.animate-fade-in-up    { animation: 0.8s ease-out backwards fadeInUp; }
.animate-pulse-glow    { animation: 4s ease-in-out infinite pulse-glow; }

.delay-100 { animation-delay: 0.1s; }
.delay-200 { animation-delay: 0.2s; }
.delay-300 { animation-delay: 0.3s; }
.delay-400 { animation-delay: 0.4s; }
.delay-500 { animation-delay: 0.5s; }

@media (prefers-reduced-motion: reduce) {
  .animate-fade-in, .animate-fade-in-up, .animate-pulse-glow { animation: none; }
}

/* HERO PATTERN — giant italic background letter, etalon-style */
.hero-stage {
  position: relative;
  overflow: hidden;
  padding: 4rem 2rem;
}
.hero-glyph {
  position: absolute;
  inset: auto 0 -8% auto;
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(12rem, 28vw, 28rem);
  line-height: 1;
  color: var(--color-foreground);
  opacity: 0.06;
  pointer-events: none;
  user-select: none;
}

/* CONTAINER */
.container { max-width: 80rem; margin: 0 auto; padding: 0 1.5rem; }
.container-prose { max-width: 68ch; margin: 0 auto; padding: 0 1.5rem; }

/* SECTION padding — etalon scale */
section { padding: 6rem 0; }
@media (min-width: 768px) { section { padding: 8rem 0; } }
@media (min-width: 1024px) { section { padding: 10rem 0; } }