/* ============================================
   FKSB - Base & Reset
   ============================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + var(--space-5));
  overflow-x: clip;
}

body {
  font-family: var(--font-fa);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  transition: background-color var(--duration-slow) var(--ease-smooth),
              color var(--duration-slow) var(--ease-smooth);
  position: relative;
}

body.is-transitioning main {
  pointer-events: none;
}

/* Subtle grain texture overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background-image: url("data:image/svg+xml;utf8,<svg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 0.7 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  opacity: var(--grain-opacity);
  mix-blend-mode: multiply;
  transition: opacity var(--duration-slow) var(--ease-smooth);
}
[data-theme="dark"] body::before { mix-blend-mode: screen; }

img, svg, video, canvas, picture {
  display: block;
  max-width: 100%;
  height: auto;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
}

button { cursor: pointer; }

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-smooth);
}

ul, ol { list-style: none; }

::selection {
  background: var(--color-primary-500);
  color: var(--text-inverse);
}

/* Custom scrollbar */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--border-2);
  border-radius: var(--radius-full);
  border: 2px solid var(--bg);
  transition: background var(--duration-base) var(--ease-smooth);
}
::-webkit-scrollbar-thumb:hover { background: var(--color-primary-500); }

/* Focus ring */
:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--text);
}

h1 { font-size: clamp(var(--text-4xl), 6vw, var(--text-7xl)); font-weight: 800; }
h2 { font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl)); font-weight: 700; }
h3 { font-size: clamp(var(--text-2xl), 3vw, var(--text-4xl)); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p { line-height: var(--leading-relaxed); color: var(--text-2); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-primary-500);
}
.eyebrow::before {
  content: '';
  width: 24px; height: 1px;
  background: currentColor;
}

.gradient-text {
  background: linear-gradient(120deg, var(--color-primary-500) 0%, var(--color-accent-500) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ============================================
   Layout
   ============================================ */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-px);
}

.section {
  padding-block: clamp(var(--space-7), 8vw, var(--space-10));
  position: relative;
}

.section-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-7);
  max-width: 720px;
}
.section-header.center { margin-inline: auto; text-align: center; align-items: center; }
.section-header h2 { letter-spacing: var(--tracking-tighter); }

.grid {
  display: grid;
  gap: var(--space-5);
}
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 360px), 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); }

main { position: relative; z-index: 2; }

[hidden] { display: none !important; }