/* NNUG – site styles. No framework; colours are CSS variables in :root. */

:root {
  --brand: #002d62;
  --brand-strong: #001c3d;
  --accent: #0a66c2;
  --accent-soft: #e6f0fb;
  --bg: #f4f6fa;
  --surface: #ffffff;
  --text: #1b2433;
  --text-muted: #5b6676;
  --border: #e2e7ef;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 4px 16px rgba(16, 24, 40, 0.06);
  --shadow-hover: 0 2px 4px rgba(16, 24, 40, 0.08), 0 12px 28px rgba(16, 24, 40, 0.12);
  --radius: 14px;
  --radius-sm: 8px;
  --max-width: 1140px;
  --header-height: 68px;
  color-scheme: light;
}

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

html {
  scroll-padding-top: calc(var(--header-height) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--brand);
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

h1,
h2,
h3 {
  color: var(--brand-strong);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(1.9rem, 1.4rem + 2vw, 2.6rem);
  margin: 0 0 0.6em;
}

h2 {
  font-size: 1.45rem;
  margin: 1.8em 0 0.5em;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

main {
  flex: 1;
  padding: 32px 0 56px;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: var(--header-height);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--brand-strong);
  font-weight: 700;
  font-size: 1.05rem;
  margin-right: auto;
}

.brand img {
  height: 36px;
  width: auto;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--text);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  white-space: nowrap;
}

.site-nav a:hover {
  background: var(--accent-soft);
  color: var(--brand);
}

.site-nav a[aria-current="page"] {
  color: var(--accent);
  background: var(--accent-soft);
}

.site-nav .lang-switch {
  border: 1px solid var(--border);
  margin-left: 8px;
}

.lang-flag {
  height: 12px;
  width: auto;
  border-radius: 2px;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.15);
}

.menu-toggle {
  display: none;
}

/* Mobile menu: a <details> element, so no JavaScript is needed. */
@media (max-width: 860px) {
  .brand-text {
    display: none;
  }

  .menu-toggle {
    display: block;
    position: relative;
  }

  .menu-toggle summary {
    list-style: none;
    cursor: pointer;
    padding: 8px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    background: var(--surface);
  }

  .menu-toggle summary::-webkit-details-marker {
    display: none;
  }

  .menu-toggle summary::before {
    content: "☰";
    margin-right: 8px;
  }

  .menu-toggle[open] summary::before {
    content: "✕";
  }

  .menu-toggle .site-nav {
    position: absolute;
    right: 0;
    top: calc(100% + 10px);
    min-width: 240px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-hover);
    padding: 8px;
  }

  .menu-toggle .site-nav ul {
    flex-direction: column;
    align-items: stretch;
  }

  .menu-toggle .site-nav a {
    width: 100%;
    padding: 10px 12px;
  }

  .site-nav .lang-switch {
    margin: 6px 0 0;
  }

  .desktop-nav {
    display: none;
  }
}

/* Hero */

.hero {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 40px;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 6px);
  box-shadow: var(--shadow);
  padding: clamp(24px, 4vw, 48px);
  margin-bottom: 56px;
}

.hero .eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.hero p {
  color: var(--text-muted);
  margin: 0 0 1em;
}

.hero figure {
  margin: 0;
}

.hero figure img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
}

.hero figcaption {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 8px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

@media (max-width: 760px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .hero figure {
    order: -1;
  }
}

/* Buttons */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background-color 0.15s, color 0.15s, border-color 0.15s;
}

.button-primary {
  background: var(--brand);
  color: #fff;
}

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

.button-secondary {
  background: transparent;
  color: var(--brand);
  border-color: var(--border);
}

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

.button svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

/* Chapters */

.section-heading {
  margin: 0 0 6px;
}

.section-intro {
  color: var(--text-muted);
  margin: 0 0 24px;
}

.chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
}

.chapter-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: box-shadow 0.2s, transform 0.2s;
}

.chapter-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.chapter-logo {
  display: flex;
  justify-content: center;
  padding: 20px 16px 12px;
  background: #fff;
}

.chapter-logo img {
  height: 76px;
  width: auto;
}

.chapter-body {
  flex: 1;
  padding: 14px 18px;
  border-top: 1px solid var(--border);
}

.all-events {
  display: inline-block;
  font-size: 0.9rem;
  margin-top: 4px;
}

.chapter-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 14px 18px 18px;
}

.chapter-footer .button {
  flex: 1 1 auto;
  padding: 8px 14px;
  font-size: 0.875rem;
}

/* Content pages */

.prose {
  max-width: 760px;
  margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 6px);
  box-shadow: var(--shadow);
  padding: clamp(24px, 5vw, 56px);
}

.prose h2:first-of-type {
  margin-top: 1.2em;
}

.prose ul {
  padding-left: 1.3em;
}

.prose li {
  margin: 0.35em 0;
}

.prose li::marker {
  color: var(--accent);
}

/* Footer */

.site-footer {
  background: var(--brand-strong);
  color: #c9d4e5;
  font-size: 0.9rem;
  padding: 28px 0;
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  justify-content: space-between;
}

.site-footer a {
  color: #fff;
}

.site-footer ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 0;
  padding: 0;
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}