/* ── Reset & base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-primary:       #2B6C8E;
  --color-primary-deep:  #1D4E6B;
  --color-primary-light: #3A8AB5;
  --color-highlight:     #D4622A;
  --color-text:          #1A1A1A;
  --color-neutral:       #7A6B5D;
  --color-bg:            #F2F0EB;
  --color-surface:       #FFFFFF;

  --font-sans: system-ui, -apple-system, "Segoe UI", sans-serif;
  --max-w: 960px;
  --section-gap: 3.5rem;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background:
    linear-gradient(rgba(242, 240, 235, 0.78), rgba(242, 240, 235, 0.78)),
    url('assets/london_hero_1280.jpg') center / cover fixed;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

/* ── Nav ── */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 80%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid color-mix(in srgb, var(--color-text) 8%, transparent);
}

nav {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo img { height: 2rem; display: block; }

.nav-cta {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  border: 1px solid color-mix(in srgb, var(--color-text) 30%, transparent);
  padding: 0.4rem 1rem;
  border-radius: 999px;
  transition: border-color 0.2s, color 0.2s;
}
.nav-cta:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* ── Sections ── */
main > section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--section-gap) 1.5rem;
}

/* ── Hero ── */
#hero {
  /* min-height: 80vh; */
  padding-top: 20vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1.5rem;
}

#hero h1 {
  font-size: clamp(2.25rem, 6vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

#hero p {
  font-size: 1.125rem;
  color: var(--color-neutral);
  max-width: 42ch;
}

/* ── Buttons ── */
.btn-primary {
  display: inline-block;
  background: var(--color-highlight);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  padding: 0.75rem 1.75rem;
  border-radius: 8px;
  transition: opacity 0.2s, transform 0.15s;
  align-self: flex-start;
}
.btn-primary:hover { opacity: 0.88; transform: translateY(-1px); }

.btn-secondary {
  display: inline-block;
  background: var(--color-primary-deep);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  padding: 0.75rem 1.75rem;
  border-radius: 8px;
  transition: opacity 0.2s, transform 0.15s;
  align-self: flex-start;
}
.btn-secondary:hover { opacity: 0.88; transform: translateY(-1px); }

/* ── Services ── */
#services h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 2.5rem;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.service-card {
  background: var(--color-surface);
  border: 1px solid color-mix(in srgb, var(--color-text) 8%, transparent);
  border-radius: 12px;
  padding: 1.75rem;
}

.service-card h3 {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.service-card p { color: var(--color-neutral); font-size: 0.9375rem; }

/* ── Contact ── */
#contact {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

#contact h2 { font-size: 2rem; font-weight: 800; }
#contact p  { color: var(--color-neutral); }
.contact-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

/* ── Footer ── */
footer {
  border-top: 1px solid color-mix(in srgb, var(--color-text) 8%, transparent);
  text-align: center;
  padding: 2rem 1.5rem;
  color: var(--color-neutral);
  font-size: 0.875rem;
}

/* ── Responsive ── */
@media (max-width: 600px) {
  #hero h1 { font-size: 2rem; }
}