/* ─── Design tokens ─── */
:root {
  --color-bg:       #ffffff;
  --color-alt:      #f4f7f6;
  --color-surface:  #ffffff;
  --color-border:   #e0e6e3;
  --color-text:     #1a2420;
  --color-muted:    #5a6b65;
  --color-accent:   #e07b1a;   /* solar orange */
  --color-accent-d: #b85f0e;
  --color-dark:     #0f2318;   /* deep green-black for hero */

  --font-sans: system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --radius: 8px;
  --max-w: 960px;
}

/* ─── Reset ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font-sans); color: var(--color-text); background: var(--color-bg); line-height: 1.6; }
img { max-width: 100%; display: block; }
a { color: inherit; }

/* ─── Utilities ─── */
.container {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.btn {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  font-weight: 600;
  font-size: 1rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background 0.2s;
}
.btn:hover { background: var(--color-accent-d); }

/* ─── Nav ─── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-dark);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.nav__logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  text-decoration: none;
  letter-spacing: 0.02em;
}
.nav__links {
  display: flex;
  gap: 1.75rem;
}
.nav__links a {
  color: rgba(255,255,255,0.75);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.15s;
}
.nav__links a:hover { color: #fff; }

/* ─── Hero ─── */
.hero {
  background: var(--color-dark);
  color: #fff;
  padding: 6rem 0 5rem;
}
.hero__headline {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1.25rem;
}
.hero__sub {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.75);
  max-width: 540px;
  margin-bottom: 2rem;
}

/* ─── Sections ─── */
.section {
  padding: 5rem 0;
}
.section--alt {
  background: var(--color-alt);
}
.section__title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.section__lead {
  color: var(--color-muted);
  margin-bottom: 2rem;
}

/* ─── Cards ─── */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 2.5rem;
}
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
}
.card__icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}
.card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.card p {
  color: var(--color-muted);
  font-size: 0.95rem;
}

/* ─── Steps ─── */
.steps {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-top: 2.5rem;
  counter-reset: steps;
}
.step {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}
.step__num {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent);
  min-width: 3rem;
  line-height: 1;
  padding-top: 0.15rem;
}
.step h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}
.step p {
  color: var(--color-muted);
  font-size: 0.95rem;
}

/* ─── About ─── */
.about__text {
  max-width: 640px;
}
.about__text h2 { margin-bottom: 1rem; }
.about__text p { color: var(--color-muted); margin-bottom: 0.75rem; }

/* ─── Contact form ─── */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  max-width: 520px;
  margin-top: 1.5rem;
}
.contact-form label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.9rem;
  font-weight: 600;
}
.contact-form input,
.contact-form textarea {
  font-family: var(--font-sans);
  font-size: 1rem;
  padding: 0.65rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color 0.15s;
}
.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}
.contact-form textarea { resize: vertical; }

/* ─── Footer ─── */
.footer {
  background: var(--color-dark);
  color: rgba(255,255,255,0.5);
  font-size: 0.875rem;
  padding: 1.5rem 0;
}
.footer__inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ─── Responsive ─── */
@media (max-width: 600px) {
  .nav__links { gap: 1rem; font-size: 0.85rem; }
  .hero { padding: 4rem 0 3.5rem; }
  .section { padding: 3.5rem 0; }
}