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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-white);
  font-weight: 700;
  line-height: 1.1;
}

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

a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

p {
  margin-bottom: var(--space-sm);
  color: var(--color-text-muted);
}

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

strong {
  color: var(--color-text);
  font-weight: 600;
}

em {
  color: var(--color-accent);
  font-style: italic;
}

ul, ol {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

code {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  background: var(--color-bg-light);
  padding: 0.2em 0.4em;
  border-radius: var(--border-radius);
}

/* Selection */
::selection {
  background-color: var(--color-accent);
  color: var(--color-bg);
}

/* Focus */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* Skip link */
.skip-link {
  position: fixed;
  top: -100%;
  left: var(--space-sm);
  background: var(--color-accent);
  color: var(--color-bg);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--border-radius);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  z-index: 1000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-sm);
}

/* Layout container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 clamp(1.5rem, 3vw, 3rem);
}

/* Section base */
.section {
  padding: var(--space-section) 0;
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: clamp(1.5rem, 3vw, 3rem);
  padding-right: clamp(1.5rem, 3vw, 3rem);
}

/* Section heading pattern */
.section__heading {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  font-size: var(--fs-xl);
  white-space: nowrap;
}

.section__number {
  font-family: var(--font-mono);
  font-size: var(--fs-md);
  color: var(--color-accent);
  font-weight: 400;
}

.section__heading::after {
  content: '';
  display: block;
  width: 100%;
  max-width: 300px;
  height: 1px;
  background-color: var(--color-bg-lighter);
}

/* Buttons */
.btn {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  border: 1px solid transparent;
}

.btn--accent {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: transparent;
}

.btn--accent:hover {
  background: var(--color-accent-tint);
  text-decoration: none;
}

.btn--outline {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: transparent;
}

.btn--outline:hover {
  background: var(--color-accent-tint);
  text-decoration: none;
}

.btn--lg {
  padding: 1.25rem 2rem;
  font-size: var(--fs-base);
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 600ms ease, transform 600ms ease;
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}