/* =========================================================
   BASE · variables, reset, tipografía global y utilidades
   ========================================================= */

:root {
  /* Canales RGB (para usarlos con transparencia: rgba(var(--rgb-x), .5)) */
  --rgb-bg: 8, 9, 12;
  --rgb-surface: 20, 22, 27;
  --rgb-text: 245, 245, 242;
  --rgb-accent: 163, 217, 165;
  --rgb-cta: 112, 201, 138;

  /* Colores */
  --color-bg: #08090C;
  --color-surface: #14161B;
  --color-text: #F5F5F2;
  --color-text-muted: rgba(var(--rgb-text), .62);
  --color-text-faint: rgba(var(--rgb-text), .42);
  --color-line: rgba(var(--rgb-text), .09);
  --color-line-strong: rgba(var(--rgb-text), .16);
  --color-accent: #A3D9A5;
  --color-accent-deep: #3E8E5C;
  --color-cta: #70C98A;
  --color-cta-hover: #7DD497;
  --color-cta-ink: #06140B;
  --color-glass-bg: rgba(var(--rgb-surface), .6);

  /* Tipografía */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Instrument Serif', Georgia, 'Times New Roman', serif;
  --font-size-base: 17px;
  --font-size-base-sm: 16px;

  /* Layout y espaciado */
  --max-width: 1180px;
  --gutter: 24px;
  --nav-height: 72px;
  --grid-gap: 20px;
  --section-pad: 120px;
  --section-pad-sm: 84px;

  /* Radios */
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 12px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  --radius-pill: 999px;

  /* Sombras */
  --shadow-cta: 0 0 0 1px rgba(var(--rgb-cta), .4), 0 12px 40px -8px rgba(var(--rgb-cta), .55);
  --shadow-cta-hover: 0 0 0 1px rgba(var(--rgb-cta), .6), 0 18px 50px -8px rgba(var(--rgb-cta), .7);
  --shadow-page: 0 30px 60px -20px rgba(0, 0, 0, .8), 0 0 0 1px rgba(255, 255, 255, .07);

  /* Movimiento */
  --ease-out: cubic-bezier(.2, .8, .2, 1);
}

/* Reset */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

/* Tipografía global */
h1, h2, h3 { font-weight: 600; letter-spacing: -.025em; line-height: 1.05; }
h2 { font-size: clamp(34px, 5vw, 58px); }
h2 .serif { font-size: 1.08em; }

.serif { font-family: var(--font-serif); font-weight: 400; letter-spacing: -.005em; }
.accent { color: var(--color-accent); }
.lead { color: var(--color-text-muted); font-size: clamp(17px, 1.6vw, 19px); max-width: 620px; }
.kicker {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 12px; font-weight: 600; letter-spacing: .18em; text-transform: uppercase;
  color: var(--color-accent);
}
.kicker:before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--color-accent); box-shadow: 0 0 12px var(--color-accent);
}

/* Layout global */
.wrap { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 var(--gutter); }
section { position: relative; padding: var(--section-pad) 0; }
main, footer { position: relative; z-index: 1; } /* sobre .grain; la nav tiene su propio z-index */

/* Textura de grano fija sobre todo el fondo */
.grain {
  position: fixed; inset: 0; pointer-events: none; z-index: 0; opacity: .035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

@media (max-width: 720px) {
  body { font-size: var(--font-size-base-sm); }
  section { padding: var(--section-pad-sm) 0; }
}