:root {
  --bg: #f4f6fb;
  --surface: #ffffff;
  --text: #102040;
  --muted: #44506a;
  --border: #bcc8de;
  --accent: #102c7a;
  --glow: 0 0 12px rgba(16, 44, 122, 0.28);
}

body.dark {
  --bg: #000000;
  --surface: #0d1d13;
  --text: #d8f6df;
  --muted: #9cc6aa;
  --border: #2e4c38;
  --accent: #37c66b;
  --glow: 0 0 12px rgba(55, 198, 107, 0.32);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
}

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

.container {
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  text-decoration: none;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.08em;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.control,
.hamburger,
.button,
.nav-link,
.panel,
.feature-image,
.brand {
  transition: box-shadow 0.2s ease, border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.control,
.hamburger {
  height: 42px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 0 0.8rem;
}

.theme-toggle {
  min-width: 72px;
  font-weight: 700;
}

.hamburger {
  width: 42px;
  padding: 0;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  cursor: pointer;
}

.hamburger span {
  width: 18px;
  height: 2px;
  background: var(--text);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.hamburger.open span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.hamburger.open span:nth-child(2) {
  opacity: 0;
}

.hamburger.open span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.site-nav {
  position: absolute;
  top: 72px;
  left: 0;
  right: 0;
  display: none;
  flex-direction: column;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.site-nav.open {
  display: flex;
}

.nav-link {
  text-decoration: none;
  color: var(--text);
  padding: 1rem;
  border-top: 1px solid var(--border);
}

.nav-link.active {
  color: var(--accent);
  font-weight: 700;
}

.hero,
.page-section {
  padding: 3rem 0;
}

.two-column,
.project-grid {
  display: grid;
  gap: 1.5rem;
}

.eyebrow {
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.1em;
  margin: 0 0 1rem;
}

h1,
h2 {
  margin: 0 0 1rem;
  line-height: 1.15;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
}

p {
  color: var(--muted);
  line-height: 1.7;
}

.lead {
  max-width: 750px;
}

.button-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

.button {
  display: inline-block;
  text-decoration: none;
  padding: 0.9rem 1.2rem;
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--surface);
}

.button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.panel,
.feature-image {
  background: var(--surface);
  border: 1px solid var(--border);
}

.panel {
  padding: 1.25rem;
}

.small-image {
  margin-bottom: 1rem;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0 2rem;
}

.nav-link:hover,
.button:hover,
.control:hover,
.hamburger:hover,
.panel:hover,
.feature-image:hover,
.brand:hover {
  box-shadow: var(--glow);
}

@media (min-width: 860px) {
  .hamburger {
    display: none;
  }

  .header-inner {
    display: grid;
    grid-template-columns: auto 1fr auto;
  }

  .site-nav {
    position: static;
    display: flex;
    flex-direction: row;
    justify-content: center;
    background: transparent;
    border-bottom: 0;
  }

  .nav-link {
    border-top: 0;
  }

  .two-column {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }

  .project-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}