/* ============================================
   Base Styles
   ============================================ */

body {
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Page entrance */
body.is-loading {
  opacity: 0;
  transform: translateY(8px);
}
body.is-loaded {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.6s var(--ease-reveal), transform 0.6s var(--ease-reveal);
}

/* === Selection === */

::selection {
  background: var(--color-primary-100);
  color: var(--color-text);
}

/* === Scrollbar (Webkit) === */

::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--color-bg);
}
::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-500);
}

/* Firefox scrollbar */
html {
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) var(--color-bg);
}

/* === Focus Visible === */

:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 3px;
  border-radius: 4px;
}

:focus:not(:focus-visible) {
  outline: none;
}

/* === Scroll Progress Bar === */

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--color-primary-500);
  z-index: 200;
  width: 0%;
  will-change: width;
}

/* === Headings === */

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  line-height: 1.15;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

h1 { font-size: var(--text-hero); font-weight: 700; }
h2 { font-size: var(--text-section); font-weight: 700; }
h3 { font-size: var(--text-sub); font-weight: 600; }

p {
  max-width: 65ch;
}

/* === Links === */

a {
  transition: color var(--dur-hover) var(--ease-hover);
}

/* === Layout === */

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-inline: var(--container-padding);
}

.section {
  padding: var(--section-padding) 0;
  position: relative;
}

.section-alt {
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-alt) 50%, var(--color-bg) 100%);
  overflow: hidden;
  position: relative;
}

/* === Utilities === */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-nav:focus {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 999;
  padding: 12px 24px;
  background: var(--color-primary-600);
  color: var(--color-text-inverse);
  font-family: var(--font-heading);
  font-weight: 600;
  border-radius: var(--btn-radius);
  clip: auto;
  width: auto;
  height: auto;
  margin: 0;
}

.text-muted { color: var(--color-text-muted); }
.text-primary { color: var(--color-primary); }
.text-accent { color: var(--color-accent); }
.text-green { color: var(--color-green); }
.text-center { text-align: center; }
.font-mono { font-family: var(--font-mono); }
.font-heading { font-family: var(--font-heading); }

.max-w-prose { max-width: 680px; }
.max-w-narrow { max-width: 550px; }
.mx-auto { margin-inline: auto; }