:root {
  --text: #263238;
  --muted: #65727a;
  --blue: #24527a;
  --blue-dark: #173b59;
  --light-blue: #eef4f8;
  --border: #d8e0e5;
  --white: #ffffff;
  --background: #f6f7f8;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
}

a {
  color: inherit;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--white);
}

.logo {
  color: var(--blue-dark);
  font-size: 1.1rem;
  font-weight: 700;
  text-decoration: none;
}

.logo span {
  color: var(--blue);
}

.nav {
  display: flex;
  gap: 22px;
  color: var(--blue);
  font-size: .9rem;
}

.nav a {
  text-decoration: none;
}

.nav a:hover,
.project-link:hover,
.contact-links a:hover {
  text-decoration: underline;
}

.hero {
  display: grid;
  grid-template-columns: 1.4fr .8fr;
  gap: 50px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 70px 24px 65px;
  background: var(--white);
}

.eyebrow,
.section-label {
  color: var(--blue);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 650px;
  margin: 14px 0 22px;
  color: var(--blue-dark);
  font-size: clamp(2.5rem, 6vw, 4.8rem);
  font-weight: 700;
  line-height: 1.08;
}

.hero-copy {
  max-width: 620px;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-copy strong {
  color: var(--text);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.button {
  display: inline-block;
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid var(--blue);
  border-radius: 4px;
  background: var(--blue);
  color: var(--white);
  font-size: .9rem;
  text-decoration: none;
}

.button:hover {
  background: var(--blue-dark);
}

.button.secondary {
  background: var(--white);
  color: var(--blue);
}

.hero-note {
  align-self: start;
  padding: 22px;
  border: 1px solid var(--border);
  border-top: 4px solid var(--blue);
  background: var(--light-blue);
}

.hero-note h2 {
  margin: 12px 0;
  color: var(--blue-dark);
  font-size: 1.45rem;
  line-height: 1.25;
}

.hero-note p {
  color: var(--muted);
  font-size: .92rem;
}

.note-line {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding-top: 12px;
  margin-top: 18px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: .72rem;
  font-weight: 700;
}

.section {
  max-width: 1100px;
  margin: 0 auto;
  padding: 58px 24px;
  background: var(--white);
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 30px;
  padding-bottom: 20px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.section-heading h2 {
  margin: 8px 0 0;
  color: var(--blue-dark);
  font-size: 2rem;
}

.section-heading p {
  max-width: 340px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: .9rem;
}

.project-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.filter-button {
  min-height: 44px;
  padding: 8px 13px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--white);
  color: var(--blue);
  cursor: pointer;
  font: inherit;
  font-size: .85rem;
}

.filter-button:hover,
.filter-button.active {
  border-color: var(--blue);
  background: var(--blue);
  color: var(--white);
}

.project-card.is-hidden {
  display: none;
}

.game-section {
  padding-top: 10px;
}

.game-box {
  max-width: 620px;
  padding: 26px;
  border: 1px solid var(--border);
  border-left: 4px solid var(--blue);
  background: var(--light-blue);
}

.game-box h2 {
  margin: 8px 0;
  color: var(--blue-dark);
  font-size: 2rem;
}

.game-box p {
  color: var(--muted);
}

.guess-form label {
  display: block;
  margin-bottom: 6px;
  color: var(--text);
  font-size: .9rem;
  font-weight: 700;
}

.guess-controls {
  display: flex;
  gap: 10px;
}

.guess-controls input {
  width: 150px;
  min-height: 44px;
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--white);
  color: var(--text);
  font: inherit;
}

.game-message {
  min-height: 28px;
  margin: 18px 0 8px;
  font-weight: 700;
}

.reset-game {
  margin-top: 4px;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.project-card {
  display: flex;
  min-height: 280px;
  flex-direction: column;
  justify-content: space-between;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--white);
}

.project-card.featured {
  min-height: 280px;
  background: var(--light-blue);
  color: var(--text);
}

.project-card.in-progress {
  background: #f8fafb;
  border-style: dashed;
}

.project-top {
  display: flex;
  justify-content: space-between;
  gap: 15px;
}

.project-type,
.project-number {
  color: var(--muted);
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
}

.project-number {
  color: var(--blue);
}

.project-card h3 {
  margin: 28px 0 8px;
  color: var(--blue-dark);
  font-size: 1.3rem;
}

.project-description {
  color: var(--muted);
  font-size: .9rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 16px;
}

.tag {
  padding: 3px 7px;
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--blue);
  font-size: .72rem;
}

.project-link {
  display: inline-block;
  min-height: 34px;
  padding-top: 6px;
  color: var(--blue);
  font-size: .85rem;
  font-weight: 700;
  text-decoration: none;
}

.about-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.about-layout h2 {
  max-width: 450px;
  margin: 10px 0 18px;
  color: var(--blue-dark);
  font-size: 2.2rem;
}

.about-text {
  max-width: 520px;
  color: var(--muted);
}

.facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-top: 1px solid var(--border);
}

.fact {
  padding: 14px 12px 14px 0;
  border-bottom: 1px solid var(--border);
}

.fact strong {
  display: block;
  color: var(--blue);
  font-size: .85rem;
}

.fact span {
  color: var(--muted);
  font-size: .82rem;
}

.contact-band {
  background: var(--blue-dark);
  color: var(--white);
}

.contact-band .section {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  background: transparent;
}

.contact-band h2 {
  max-width: 550px;
  margin: 10px 0 0;
  font-size: 2.4rem;
}

.contact-band .section-label {
  color: #b9d3e7;
}

.contact-links {
  display: grid;
  gap: 10px;
  min-width: 250px;
}

.contact-links a {
  color: #cfe5f5;
  font-size: .85rem;
  text-decoration: none;
}

footer {
  display: flex;
  justify-content: space-between;
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px 24px 30px;
  color: var(--muted);
  background: var(--white);
  font-size: .75rem;
}

.scroll-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  display: none;
  padding: 9px 12px;
  border: 1px solid var(--blue);
  border-radius: 4px;
  background: var(--white);
  color: var(--blue);
  font-size: .82rem;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 2px 8px rgba(23, 59, 89, .12);
}

.scroll-top.visible {
  display: inline-block;
}

.scroll-top:hover {
  background: var(--light-blue);
}

@media (max-width: 800px) {
  .site-header,
  .hero,
  .section,
  footer {
    padding-right: 18px;
    padding-left: 18px;
  }

  .hero,
  .about-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .section-heading,
  .contact-band .section {
    align-items: start;
    flex-direction: column;
  }

  .project-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 520px) {
  .site-header {
    align-items: flex-start;
    gap: 16px;
    flex-direction: column;
  }

  .nav {
    gap: 15px;
  }

  .hero {
    padding-top: 45px;
    padding-bottom: 45px;
  }

  h1 {
    font-size: 2.8rem;
  }

  .project-grid,
  .facts {
    grid-template-columns: 1fr;
  }

  .guess-controls {
    align-items: stretch;
    flex-direction: column;
  }

  .guess-controls input {
    width: 100%;
  }

  .guess-controls .button {
    width: 100%;
    text-align: center;
  }

  .contact-band h2 {
    font-size: 2rem;
  }

  footer {
    gap: 8px;
    flex-direction: column;
  }
}