/* Sterling & Classon Ltd — foundation site styles */

:root {
  --font-body: "Atkinson Hyperlegible", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --ink: #1b2430;
  --ink-soft: #4a5568;
  --bg: #fbf9f5;
  --bg-alt: #f1ece2;
  --surface: #ffffff;
  --border: #e4ddce;

  --accent: #c1611f;
  --accent-ink: #ffffff;
  --accent-soft: #f4e3d3;

  --navy: #1f2f4d;

  --radius: 14px;
  --max-width: 1080px;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f2ede4;
    --ink-soft: #c7c0b3;
    --bg: #171512;
    --bg-alt: #201d19;
    --surface: #211e1a;
    --border: #38332c;
    --accent: #e0955a;
    --accent-ink: #1b1512;
    --accent-soft: #3a2c1e;
    --navy: #2a3a5c;
  }
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  letter-spacing: 0.01em;
  color: var(--ink);
  background: var(--bg);
}

h1, h2, h3 {
  font-family: var(--font-body);
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink);
  margin: 0 0 var(--space-2);
}

h1 { font-size: clamp(2rem, 4.5vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); }
h3 { font-size: 1.2rem; }

p { margin: 0 0 var(--space-2); color: var(--ink-soft); }

a {
  color: var(--navy);
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  background: var(--accent);
  color: var(--accent-ink);
  padding: var(--space-1) var(--space-2);
  border-radius: 6px;
  z-index: 100;
  font-weight: 700;
  text-decoration: none;
}

.skip-link:focus {
  left: var(--space-2);
  top: var(--space-2);
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
}

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 8px;
  background: var(--navy);
  color: #fff;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}

.logo-text {
  font-size: 1.05rem;
}

.primary-nav ul {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
}

.primary-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  font-weight: 700;
  font-size: 0.95rem;
}

.primary-nav a:hover {
  color: var(--ink);
}

.nav-cta {
  background: var(--navy);
  color: #fff !important;
  padding: 0.5rem 1rem;
  border-radius: 999px;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 2.5rem;
  height: 2.5rem;
  cursor: pointer;
  position: relative;
}

.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 25%;
  right: 25%;
  height: 2px;
  background: var(--ink);
}
.nav-toggle-bars { top: 50%; transform: translateY(-1px); }
.nav-toggle-bars::before { top: -8px; }
.nav-toggle-bars::after { top: 8px; }

/* Hero */

.hero {
  padding: var(--space-5) 0 var(--space-4);
}

.hero-inner {
  max-width: 760px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: var(--space-1);
}

.hero-lede {
  font-size: 1.2rem;
  max-width: 620px;
}

.hero-actions {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-top: var(--space-3);
}

/* Buttons */

.btn {
  display: inline-block;
  text-decoration: none;
  font-weight: 700;
  font-size: 1rem;
  padding: 0.8rem 1.5rem;
  border-radius: 999px;
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
}

.btn-primary:hover {
  filter: brightness(0.92);
}

.btn-secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--border);
}

.btn-secondary:hover {
  border-color: var(--accent);
}

.btn-large {
  font-size: 1.1rem;
  padding: 1rem 2rem;
}

/* Sections */

.section {
  padding: var(--space-5) 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-intro {
  max-width: 620px;
  font-size: 1.05rem;
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.lede {
  font-size: 1.1rem;
  color: var(--ink);
}

.sic-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.sic-list li {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.5rem 1rem;
  border-radius: 999px;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

/* Cards */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-3);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-3);
}

.card h3 {
  margin-bottom: var(--space-1);
}

.card p {
  margin-bottom: 0;
  font-size: 0.98rem;
}

/* Principles */

.principle-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-3);
}

.principle {
  border-left: 3px solid var(--accent);
  padding-left: var(--space-2);
}

.principle p {
  margin-bottom: 0;
  font-size: 0.98rem;
}

/* Project card */

.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
  margin-top: var(--space-3);
}

.badge {
  display: inline-block;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  margin-bottom: var(--space-1);
}

.project-info h3 {
  margin-top: 0.25rem;
}

.projects-footnote {
  margin-top: var(--space-3);
  font-size: 0.95rem;
  color: var(--ink-soft);
}

/* Contact */

.contact-section {
  text-align: center;
}

.contact-section .section-intro {
  margin-left: auto;
  margin-right: auto;
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-3) 0;
}

.footer-inner p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

/* Responsive */

@media (max-width: 780px) {
  .about-grid {
    grid-template-columns: 1fr;
  }

  .nav-toggle {
    display: block;
  }

  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    display: none;
  }

  .primary-nav.open {
    display: block;
  }

  .primary-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: var(--space-2) var(--space-3) var(--space-3);
  }

  .primary-nav li {
    width: 100%;
  }

  .primary-nav a {
    display: block;
    padding: var(--space-1) 0;
  }

  .nav-cta {
    display: inline-block;
    margin-top: var(--space-1);
  }
}