:root {
  --dark-grey: #333333;
  --mid-grey: #666666;
  --light-grey: #F5F5F5;
  --white: #FFFFFF;
  --accent-grey: #888888;
}

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

body {
  font-family: 'Open Sans', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--dark-grey);
  background-color: var(--white);
  line-height: 1.6;
}

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

/* Header / nav */

header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--white);
  border-bottom: 1px solid #e1e1e1;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 1.1rem;
}

.logo-icon {
  width: 22px;
  height: 22px;
  border: 2px solid var(--dark-grey);
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 2px;
  padding: 2px;
}

.logo-icon span {
  border: 1px solid var(--dark-grey);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  font-size: 0.95rem;
}

.nav-links a {
  position: relative;
  font-weight: 500;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 0;
  height: 2px;
  background: var(--dark-grey);
  transition: width 0.2s ease;
}

.nav-links a:hover::after {
  width: 100%;
}

.btn {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  border: 1px solid var(--dark-grey);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.btn-primary {
  background: var(--dark-grey);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--accent-grey);
  border-color: var(--accent-grey);
}

.btn-outline {
  background: transparent;
  color: var(--dark-grey);
}

.btn-outline:hover {
  background: #f0f0f0;
}

/* Generic layout */

main {
  padding: 3rem 0 3.5rem;
}

section {
  padding: 2.5rem 0;
}

.section-light {
  background: var(--light-grey);
}

.page-title {
  font-family: 'Montserrat', sans-serif;
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.page-intro {
  color: var(--mid-grey);
  font-size: 0.98rem;
  max-width: 650px;
  margin-bottom: 2rem;
}

.section-title {
  font-family: 'Montserrat', sans-serif;
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.section-subtitle {
  color: var(--mid-grey);
  font-size: 0.95rem;
  max-width: 520px;
  margin-bottom: 2rem;
}

/* Grids & cards */

.cards-grid,
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
}

.card,
.feature-card {
  background: var(--white);
  border-radius: 10px;
  padding: 1.3rem 1.1rem;
  border: 1px solid #e1e1e1;
  font-size: 0.9rem;
}

.card h3,
.feature-card h3 {
  font-family: 'Montserrat', sans-serif;
  font-size: 1rem;
  margin-bottom: 0.4rem;
}

.card p,
.feature-card p {
  color: var(--mid-grey);
  font-size: 0.88rem;
}

/* Two-column sections */

.two-col {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: 2rem;
  align-items: flex-start;
}

/* Lists */

ul {
  padding-left: 1.1rem;
  margin-bottom: 1rem;
}

li {
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
}

/* Steps */

.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
}

.step {
  text-align: center;
  padding: 1.3rem 1rem;
}

.step-number {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--dark-grey);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 0.7rem;
  font-size: 0.85rem;
  font-weight: 600;
}

/* Contact */

.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 2rem;
  align-items: flex-start;
}

form {
  display: grid;
  gap: 1rem;
}

label {
  font-size: 0.9rem;
  font-weight: 600;
}

input,
textarea,
select {
  width: 100%;
  padding: 0.6rem 0.7rem;
  border-radius: 6px;
  border: 1px solid #d0d0d0;
  font-family: inherit;
  font-size: 0.9rem;
}

textarea {
  min-height: 130px;
  resize: vertical;
}

/* Footer */

footer {
  background: var(--dark-grey);
  color: var(--white);
  padding: 2rem 0;
  font-size: 0.85rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
}

.footer-title {
  font-family: 'Montserrat', sans-serif;
  font-weight: 600;
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.footer-links a {
  display: block;
  margin-bottom: 0.3rem;
  color: #e6e6e6;
}

.footer-bottom {
  margin-top: 1.5rem;
  border-top: 1px solid #555;
  padding-top: 1rem;
  text-align: center;
  color: #bbbbbb;
}

/* Responsive */

@media (max-width: 900px) {
  .nav-links {
    gap: 1rem;
    font-size: 0.85rem;
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  .cards-grid,
  .features-grid,
  .two-col,
  .steps,
  .footer-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  main {
    padding-top: 2rem;
  }
}