/* ==========================================================================
   BASE STYLES & RESET
   Industrial Surveying Aesthetic
   ========================================================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-secondary);
  color: var(--color-tertiary);
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(192, 213, 50, 0.05) 0%, transparent 60%),
    linear-gradient(to right, rgba(254, 254, 254, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(254, 254, 254, 0.02) 1px, transparent 1px);
  background-size: 100% 100%, 48px 48px, 48px 48px;
}

/* Technical Survey Corner Marks & Crosshairs */
.survey-grid-bg {
  position: relative;
}

.survey-grid-bg::before {
  content: "+";
  position: absolute;
  top: 12px;
  left: 12px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-primary-ink);
  opacity: 0.4;
  pointer-events: none;
}

.survey-grid-bg::after {
  content: "+";
  position: absolute;
  bottom: 12px;
  right: 12px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-primary-ink);
  opacity: 0.4;
  pointer-events: none;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-tertiary);
}

h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  text-transform: uppercase;
}

h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.75rem);
  text-transform: uppercase;
}

h3 {
  font-size: clamp(1.2rem, 2.2vw, 1.6rem);
}

p {
  color: var(--color-tertiary-muted);
}

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

code, kbd, samp, pre {
  font-family: var(--font-mono);
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

@media (min-width: 768px) {
  .container {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }
}

.section {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
  border-bottom: 1px solid var(--color-secondary-border);
}

@media (min-width: 992px) {
  .section {
    padding-top: var(--space-20);
    padding-bottom: var(--space-20);
  }
}

/* Technical Numbered Section Header */
.section-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-primary-ink);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

.section-meta::after {
  content: "";
  flex: 1;
  max-width: 60px;
  height: 2px;
  background-color: var(--color-primary);
  opacity: 0.6;
}

.section-title {
  margin-bottom: var(--space-4);
}

.section-desc {
  font-size: var(--text-lg);
  max-width: 720px;
  line-height: 1.7;
}

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

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-secondary-elevated);
  border: 1px solid var(--color-secondary-border);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}

/* Keyboard users jump past the navigation */
.skip-link {
  position: absolute;
  left: 8px;
  top: -48px;
  z-index: 1000;
  padding: 10px 16px;
  background: var(--color-primary);
  color: var(--color-secondary);
  font-weight: 700;
  transition: top 0.15s;
}
.skip-link:focus { top: 8px; }