/**
 * DRD Engineers Global CSS
 * Base CSS, typography, layout container & grid systems
 */

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: var(--line-height-body-md);
  color: var(--color-on-surface);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-background);
  color: var(--color-on-surface);
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  color: var(--color-on-surface);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 {
  font-size: var(--font-size-display-lg);
  line-height: var(--line-height-display-lg);
}

h2 {
  font-size: var(--font-size-headline-lg);
  line-height: var(--line-height-headline-lg);
}

h3 {
  font-size: 24px;
  line-height: 30px;
}

h4 {
  font-size: 20px;
  line-height: 26px;
}

p {
  margin-bottom: var(--space-4);
  font-size: var(--font-size-body-md);
  line-height: var(--line-height-body-md);
  color: var(--color-on-surface);
}

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

a:hover, a:focus {
  color: var(--color-primary);
}

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

ul, ol {
  list-style: none;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

/* Technical / Mono Font Utility */
.font-mono,
.badge,
.label-mono,
.code-text {
  font-family: var(--font-mono);
}

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

@media (max-width: 768px) {
  .container {
    padding-left: var(--margin-mobile);
    padding-right: var(--margin-mobile);
  }

  h1 {
    font-size: 32px;
    line-height: 40px;
  }

  h2 {
    font-size: var(--font-size-headline-lg-mobile);
    line-height: var(--line-height-headline-lg-mobile);
  }
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--gutter-desktop);
}

.grid-12 {
  grid-template-columns: repeat(12, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

@media (max-width: 992px) {
  .grid-4, .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .grid, .grid-12, .grid-4, .grid-3, .grid-2 {
    grid-template-columns: 1fr;
    gap: var(--gutter-mobile);
  }
}

/* Section Wrapper */
.section {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
}

.section-dark {
  background-color: var(--color-inverse-surface);
  color: var(--color-inverse-on-surface);
}

.section-dark h1,
.section-dark h2,
.section-dark h3,
.section-dark h4 {
  color: #ffffff;
}

.section-dark p {
  color: var(--color-surface-dim);
}

/* Helper Classes */
.text-primary { color: var(--color-primary-container) !important; }
.text-center { text-align: center; }
.text-uppercase { text-transform: uppercase; }

.section-header {
  margin-bottom: var(--space-10);
}

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

.section-subtitle {
  font-family: var(--font-mono);
  font-size: var(--font-size-label-md);
  color: var(--color-primary-container);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-2);
  display: block;
}