/* ===== Reset & Base ===== */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-text: #1a1a2e;
  --color-text-light: #4a4a6a;
  --color-bg: #fafaf9;
  --color-surface: #ffffff;
  --color-accent: #2c5f8a;
  --color-accent-dark: #1e4263;
  --color-border: #ddd;
  --max-width: 52rem;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 3rem;
  --space-xl: 5rem;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== Skip Link ===== */

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-sm);
  background: var(--color-accent);
  color: #fff;
  padding: var(--space-xs) var(--space-sm);
  z-index: 100;
  border-radius: 0 0 4px 4px;
}

.skip-link:focus {
  top: 0;
}

/* ===== Typography ===== */

h1, h2, h3, h4 {
  line-height: 1.25;
  color: var(--color-text);
}

h1 {
  font-size: clamp(1.75rem, 1.5rem + 1vw, 2.25rem);
  margin-bottom: var(--space-sm);
}

h2 {
  font-size: 1.5rem;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

h3 {
  font-size: 1.2rem;
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
}

p {
  margin-bottom: var(--space-sm);
  max-width: 65ch;
}

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

a:hover {
  color: var(--color-accent-dark);
}

ul, ol {
  margin-bottom: var(--space-sm);
  padding-left: var(--space-md);
}

li {
  margin-bottom: var(--space-xs);
}

blockquote {
  border-left: 3px solid var(--color-accent);
  padding-left: var(--space-sm);
  margin: var(--space-md) 0;
  color: var(--color-text-light);
  font-style: italic;
}

.epigraph {
  border-left: none;
  text-align: center;
  max-width: 40rem;
  margin: var(--space-md) auto var(--space-lg);
  font-size: 1.1rem;
  color: var(--color-text-light);
  font-style: italic;
}

.epigraph cite {
  display: block;
  margin-top: var(--space-xs);
  font-size: 0.9rem;
  font-style: normal;
}

hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-lg) 0;
}

/* ===== Header ===== */

header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-sm) var(--space-md);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.site-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.site-title:hover {
  color: var(--color-accent);
}

nav ul {
  list-style: none;
  display: flex;
  gap: var(--space-sm);
  padding: 0;
  margin: 0;
}

nav a {
  text-decoration: none;
  font-size: 0.95rem;
  padding: var(--space-xs);
}

nav a[aria-current="page"] {
  font-weight: 700;
  border-bottom: 2px solid var(--color-accent);
}

/* ===== Main ===== */

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md);
  flex: 1;
  width: 100%;
}

/* ===== Page Sections ===== */

.hero {
  margin-bottom: var(--space-lg);
}

.hero h1 {
  font-size: clamp(1.75rem, 1.25rem + 2vw, 2.75rem);
}

.hero .tagline {
  font-size: 1.15rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
}

.cta-group {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-top: var(--space-md);
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background-color 0.15s;
}

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

.btn-primary:hover {
  background: var(--color-accent-dark);
  color: #fff;
}

.btn-secondary {
  border: 2px solid var(--color-accent);
  color: var(--color-accent);
}

.btn-secondary:hover {
  background: var(--color-accent);
  color: #fff;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: var(--space-md);
  margin: var(--space-md) 0;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: var(--space-md);
}

.card h3 {
  margin-top: 0;
}

.social-links {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.social-links a {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  text-decoration: none;
  font-size: 0.95rem;
  transition: border-color 0.15s;
}

.social-links a:hover {
  border-color: var(--color-accent);
}

/* ===== Forms ===== */

.contact-form label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  font-size: 0.95rem;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  max-width: 32rem;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-text);
  background: var(--color-surface);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
  border-color: var(--color-accent);
}

.contact-form .hidden {
  display: none;
}

/* ===== Footer ===== */

footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-md);
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

footer a {
  color: var(--color-text-light);
}

/* ===== Responsive ===== */

@media (max-width: 860px) {
  main {
    padding: var(--space-md) var(--space-md);
  }
  .card-grid {
    grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  }
}

@media (max-width: 640px) {
  .header-inner {
    flex-direction: column;
    text-align: center;
  }

  nav ul {
    flex-wrap: wrap;
    justify-content: center;
  }

  main {
    padding: var(--space-md) var(--space-sm);
  }

  .cta-group {
    flex-direction: column;
  }

  .card-grid {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  .btn {
    text-align: center;
  }
}