/* ============================================================
   BASE — Reset, typography, containers, utilities
   ============================================================ */

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

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: var(--line-height);
  color: var(--text-primary);
  background-color: var(--bg-base);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

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

a {
  color: var(--accent-1);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover { color: var(--accent-2); }

ul, ol { list-style: none; }

button {
  font-family: var(--font-body);
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, select {
  font-family: var(--font-body);
  font-size: 1rem;
}

/* ── Container ─────────────────────────────────────────── */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  width: 100%;
}

/* ── Typography ─────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.15;
  color: var(--text-primary);
}

h1 { font-size: clamp(2.5rem, 5vw, 4.5rem); }
h2 { font-size: clamp(2rem, 4vw, 3.5rem); }
h3 { font-size: clamp(1.4rem, 2.5vw, 2rem); }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

p {
  color: var(--text-secondary);
  margin-bottom: 1em;
}

p:last-child { margin-bottom: 0; }

.mono { font-family: var(--font-mono); }

/* ── Section scaffold ───────────────────────────────────── */
.section {
  padding-block: var(--space-xl);
  position: relative;
}

.section--alt { background-color: var(--bg-surface); }

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent-1);
  margin-bottom: var(--space-xs);
}

.section-heading {
  margin-bottom: var(--space-md);
}

.section-heading h2 {
  position: relative;
  display: inline-block;
}

.section-heading p {
  font-size: 1.1rem;
  max-width: 600px;
  margin-top: var(--space-sm);
}

/* Oversized decorative background word */
.section-heading__bg {
  display: block;
  font-size: clamp(5rem, 12vw, 10rem);
  font-weight: 800;
  color: var(--accent-1);
  opacity: 0.04;
  line-height: 0.85;
  letter-spacing: -0.04em;
  user-select: none;
  pointer-events: none;
  position: absolute;
  top: -0.2em;
  left: -0.1em;
  white-space: nowrap;
}

/* ── Grid utilities ─────────────────────────────────────── */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3 { grid-template-columns: 1fr; }
}

@media (max-width: 992px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

/* ── Flex utilities ─────────────────────────────────────── */
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-gap { display: flex; align-items: center; gap: var(--space-sm); }

/* ── Visibility ─────────────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

/* ── Loader ─────────────────────────────────────────────── */
#page-loader {
  position: fixed;
  inset: 0;
  background: var(--bg-base);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.4s ease, visibility 0.4s ease;
}

#page-loader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-ring {
  width: 48px;
  height: 48px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-1);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}