/* Reset & base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  overflow-x: hidden;

  /* Noise texture overlay */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
}

img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }
ul, ol { list-style: none; }

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--space-6);
}

@media (min-width: 768px) {
  .container { padding-inline: var(--space-10); }
}

/* Utility: mono class */
.mono {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
}

/* Utility: label */
.label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
}

/* Utility: accent color */
.accent { color: var(--color-accent); }

/* Headings */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(var(--text-4xl), 7vw, var(--text-7xl)); }
h2 { font-size: clamp(var(--text-3xl), 5vw, var(--text-5xl)); }
/* h3/h4 use body font; give them tighter line-height with enough room for descenders */
h3 { font-size: var(--text-xl); font-family: var(--font-body); font-weight: 600; line-height: 1.3; }
h4 { font-size: var(--text-lg); font-family: var(--font-body); font-weight: 600; line-height: 1.3; }

em { font-style: italic; }

p {
  color: var(--color-text-dim);
  line-height: 1.7;
}

/* Reveal animation base */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal--delay-1 { transition-delay: 100ms; }
.reveal--delay-2 { transition-delay: 200ms; }
.reveal--delay-3 { transition-delay: 300ms; }
.reveal--delay-4 { transition-delay: 400ms; }

/* Section spacing */
.section {
  padding-block: var(--space-24);
}

.section--dark {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

/* Section header */
.section-header {
  margin-bottom: var(--space-16);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.section-header .label { margin-bottom: var(--space-2); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.03em;
  border-radius: var(--radius-sm);
  transition:
    background var(--duration-base) var(--ease-out),
    color var(--duration-base) var(--ease-out),
    border-color var(--duration-base) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--color-accent);
  color: #000;
  border: 1px solid var(--color-accent);
}

.btn--primary:hover {
  background: #fbbf24;
  border-color: #fbbf24;
}

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border-2);
}

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

.btn--full { width: 100%; justify-content: center; }