/* ===== 1. Reset ===== */

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

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

/* ===== 2. Tokens ===== */

:root {
  --color-bg: #ffffff;
  --color-primary: #131A38;
  --color-surface: #F1F1F1;

  --font-body: "Google Sans Flex", sans-serif;

  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 18px;
  --text-lg: 28px;
  --text-xl: 36px;
  --text-xxl: 42px;

  --space-8: 8px;
  --space-12: 12px;
  --space-16: 16px;
  --space-24: 24px;
  --space-32: 32px;
  --space-48: 48px;

  --radius-card: 32px;
  --radius-pill: 999px;
}

@media (min-width: 768px) {
  :root {
    --text-xs: 14px;
    --text-sm: 16px;
    --text-base: 24px;
    --text-lg: 32px;
    --text-xl: 48px;
    --text-xxl: 96px;
  }
}

/* ===== 3. Base elements ===== */

body {
  margin: 0;
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-primary);
}

h1, h2, h3 {
  font-weight: 600;
  margin: 0;
}

h1 {
  font-size: var(--text-xxl);
}

h2 {
  font-size: var(--text-xl);
}

h3 {
  font-size: var(--text-lg);
}

p {
  font-size: var(--text-base);
}

/* ===== 4. Layout ===== */

.container {
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: var(--space-24);
}

/* ===== 5. Components ===== */

.button {
  display: inline-block;
  padding: var(--space-12) var(--space-24);
  font-size: var(--text-sm);
  text-decoration: none;
  background-color: var(--color-primary);
  color: var(--color-bg);
  border-radius: var(--radius-pill);
}

.button-reverse {
  background-color: var(--color-bg);
  color: var(--color-primary);
}

.card, .project {
  display: flex;
  flex-direction: column;
  background-color: var(--color-surface);
  border-radius: var(--radius-card);
  padding: var(--space-32);
}

@media (min-width: 768px) {
  .card {
    min-height: 320px;
  }
}

.card-number {
  font-size: var(--text-lg);
}

.card h3 {
  margin-top: auto;
}

.card p, .project p {
  font-size: var(--text-sm);
  margin: 0;
  margin-top: var(--space-8);  
}

.card-featured {
  background-color: var(--color-primary);
  color: var(--color-bg);
}

.card-featured h3 {
  font-size: var(--text-xl);
}

.card-featured .card-number {
  font-size: var(--text-xl);
}

.project h3 {
  margin-top: var(--space-16);
}

.project img {
  border-radius: var(--radius-card);
}

/* ===== 6. Sections ===== */

/* Header */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-block: var(--space-24);
}

header a {
  color: inherit;
  text-decoration: none;
}

nav {
  display: flex;
  align-items: center;
  gap: var(--space-24);
}

.nav-link {
  display: none;
}

@media (min-width: 768px) {
  .nav-link {
    display: inline;
  }
}

/* Hero */
.hero {
  padding-block: var(--space-24);
  text-align: center;
}

.hero h1 {
  max-width: 15ch;
  margin-inline: auto;
}

.hero p {
  max-width: 48ch;
  margin-inline: auto;
}

/* Shared section styles */

.services, .work, .contact {
  padding-block: var(--space-24);
}

.services h2, .work h2 {
  text-align: center;
  margin-bottom: var(--space-32);
}

.services ul, .work ul {
  display: grid;
  list-style: none;
  padding: 0;
  margin: 0;
  gap: var(--space-16);
}

@media (min-width: 768px) {
  .hero, .services, .work, .contact {
     padding-block: var(--space-48);
   }
  .services ul {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
  .work ul {
    grid-template-columns: 1fr 1fr;
  }
}

/* Contact */ 

.contact-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-24);
  background-color: var(--color-primary);
  color: var(--color-bg);
  text-align: center;
  padding: var(--space-48);
  border-radius: var(--radius-card);
}

.contact-box p {
  font-size: var(--text-sm);
  margin: 0;
}

.contact-link {
  color: inherit;
  font-size: var(--text-sm);
}

/* Footer */ 

footer {
  border-top: 1px solid var(--color-primary);
}

footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-block: var(--space-24);
}

footer p {
  font-size: var(--text-sm);
  margin: 0;
}

footer a {
  color: inherit;
  font-size: var(--text-sm);
}