/* =============================================
   1. :root — Design tokens
   ============================================= */
:root {
  --primary: #2B2D42;
  --accent: #8D99AE;
  --bg: #FFFFFF;
  --text: #1A1A2E;
  --muted: #9A9AAF;
  --space-xs: 12px;
  --space-sm: 24px;
  --space-md: 36px;
  --space-lg: 48px;
  --space-xl: 72px;
  --radius: 2px;
  --container: 720px;
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --line-height: 1.65;
  --transition: 0.2s ease;
}

/* =============================================
   2. Reset
   ============================================= */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: var(--line-height);
  min-height: 100vh;
  overflow-x: hidden;
}

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

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

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

a:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* =============================================
   3. Typography
   ============================================= */
h1,
h2,
h3,
h4 {
  color: var(--primary);
  font-weight: 600;
  line-height: 1.25;
}

h1 {
  font-size: 1.75rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.375rem;
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
}

h3 {
  font-size: 1.125rem;
  margin-top: var(--space-sm);
  margin-bottom: var(--space-xs);
}

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

.lead {
  font-size: 1.125rem;
  color: var(--primary);
  line-height: 1.5;
}

.muted {
  color: var(--muted);
  font-size: 0.875rem;
}

.meta {
  color: var(--muted);
  font-size: 0.8125rem;
  letter-spacing: 0.01em;
}

.article-body p {
  margin-bottom: var(--space-sm);
}

.article-body h2 {
  margin-top: var(--space-lg);
}

.article-body blockquote {
  border-left: 2px solid var(--accent);
  margin: var(--space-sm) 0;
  padding-left: var(--space-sm);
  color: var(--primary);
  font-style: italic;
}

/* =============================================
   4. Layout
   ============================================= */
.site-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--space-xs);
  padding-right: var(--space-xs);
}

.site-header {
  border-bottom: 1px solid var(--accent);
  padding: var(--space-sm) 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xs);
}

.site-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: -0.03em;
}

.site-logo:hover {
  color: var(--primary);
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-xs);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--primary);
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--accent);
  padding: var(--space-xs) var(--space-xs) var(--space-sm);
  z-index: 100;
}

.site-nav.is-open {
  display: block;
}

.site-header {
  position: relative;
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.nav-list a {
  text-decoration: none;
  color: var(--text);
  font-size: 0.9375rem;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), color var(--transition);
}

.nav-list a:hover,
.nav-list a[aria-current="page"] {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.site-main {
  flex: 1;
  padding: var(--space-md) 0 var(--space-xl);
}

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

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-sm);
}

.footer-nav a {
  font-size: 0.8125rem;
  color: var(--muted);
  text-decoration: none;
}

.footer-nav a:hover {
  color: var(--primary);
  text-decoration: underline;
}

.footer-copy {
  font-size: 0.75rem;
  color: var(--muted);
}

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

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

.hero-lead {
  max-width: 38em;
}

.section-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: var(--space-sm);
  font-weight: 500;
}

.page-header {
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--accent);
}

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

.content-section:last-child {
  margin-bottom: 0;
}

/* =============================================
   5. Components
   ============================================= */
.article-list {
  counter-reset: article-counter;
}

.article-list-item {
  counter-increment: article-counter;
  border-bottom: 1px solid var(--accent);
  padding: var(--space-sm) 0;
}

.article-list-item:first-child {
  padding-top: 0;
}

.article-list-link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.article-list-link:hover .article-list-title {
  color: var(--accent);
}

.article-list-link::before {
  content: counter(article-counter, decimal-leading-zero);
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
  margin-bottom: var(--space-xs);
  font-variant-numeric: tabular-nums;
}

.article-list-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: var(--space-xs);
  transition: color var(--transition);
}

.article-list-excerpt {
  color: var(--text);
  font-size: 0.9375rem;
  margin-bottom: var(--space-xs);
}

.article-list-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  align-items: center;
}

.card-flat {
  background: var(--bg);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: var(--space-sm);
}

.author-line {
  font-size: 0.8125rem;
  color: var(--muted);
}

.author-line a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}

.author-line a:hover {
  text-decoration: underline;
}

.article-header {
  margin-bottom: var(--space-md);
}

.article-title {
  font-size: 1.75rem;
  margin-bottom: var(--space-xs);
}

.article-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-sm);
  margin-bottom: var(--space-sm);
}

.updated-note {
  font-size: 0.8125rem;
  color: var(--muted);
  font-style: italic;
}

.author-bio {
  margin-top: var(--space-md);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--accent);
}

.author-bio-name {
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 4px;
}

.author-bio-text {
  font-size: 0.875rem;
  color: var(--text);
}

.related-articles {
  margin-top: var(--space-lg);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--accent);
}

.related-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.related-list a {
  text-decoration: none;
  color: var(--primary);
  font-size: 0.9375rem;
}

.related-list a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.contact-info {
  margin-top: var(--space-sm);
}

.contact-info a {
  color: var(--primary);
}

.policy-list {
  margin: var(--space-xs) 0 var(--space-sm);
  padding-left: var(--space-sm);
}

.policy-list li {
  list-style: disc;
  margin-bottom: 8px;
  color: var(--text);
}

.cookie-notice {
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: var(--space-xs);
  line-height: 1.5;
}

.cookie-notice a {
  color: var(--primary);
}

.cookie-notice.is-hidden {
  display: none;
}

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

.hero-graphic {
  margin-top: var(--space-sm);
  opacity: 0.4;
  max-width: 120px;
}

.thumb-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

/* =============================================
   6. Utilities
   ============================================= */
.mb-sm {
  margin-bottom: var(--space-sm);
}

.mb-md {
  margin-bottom: var(--space-md);
}

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

.mt-sm {
  margin-top: var(--space-sm);
}

.mt-md {
  margin-top: var(--space-md);
}

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

/* =============================================
   7. Media queries
   ============================================= */
@media (min-width: 480px) {
  h1 {
    font-size: 2rem;
  }

  .article-title {
    font-size: 2rem;
  }

  .article-list-title {
    font-size: 1.375rem;
  }
}

@media (min-width: 768px) {
  .container {
    padding-left: var(--space-sm);
    padding-right: var(--space-sm);
  }

  .nav-toggle {
    display: none;
  }

  .site-nav {
    display: block;
    position: static;
    border-bottom: none;
    padding: 0;
    background: transparent;
  }

  .nav-list {
    flex-direction: row;
    gap: var(--space-sm);
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .lead {
    font-size: 1.25rem;
  }

  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-end;
  }
}

@media (min-width: 1024px) {
  h1 {
    font-size: 2.25rem;
  }

  .site-main {
    padding-top: var(--space-lg);
  }

  .article-title {
    font-size: 2.25rem;
  }
}