/* Groundwater World — Clean Redesign
   Light theme · Editorial clarity · No WordPress bloat
   Fonts: Source Serif 4 (headings), Instrument Sans (body)
*/

@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:ital,opsz,wght@0,8..60,300;0,8..60,400;0,8..60,600;0,8..60,700;1,8..60,400&family=Instrument+Sans:wght@400;500;600;700&display=swap');

/* ── Reset & Base ────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-ink: #1a1a2e;
  --color-body: #3d3d56;
  --color-muted: #6b6b80;
  --color-border: #e2e2ea;
  --color-surface: #f8f8fb;
  --color-bg: #ffffff;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-accent-soft: #eff4ff;
  --color-water: #0e7490;
  --color-water-soft: #ecfeff;
  --font-heading: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-body: 'Instrument Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1200px;
  --content-width: 740px;
}

html { font-size: 17px; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  color: var(--color-body);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--color-accent-hover); }

/* ── Header ──────────────────────────────────────── */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.8rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}
.site-logo img {
  height: 48px;
  width: auto;
}
.site-nav { display: flex; gap: 0.25rem; }
.site-nav a {
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--color-body);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  letter-spacing: 0.01em;
  transition: background 0.2s, color 0.2s;
}
.site-nav a:hover,
.site-nav a.active {
  background: var(--color-surface);
  color: var(--color-ink);
}

/* Mobile nav toggle */
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 0.5rem; }
.nav-toggle svg { width: 24px; height: 24px; stroke: var(--color-ink); }

@media (max-width: 768px) {
  .header-inner { padding: 0.6rem 1.25rem; }
  .site-logo img { height: 36px; }
  .nav-toggle { display: block; }
  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 0.5rem 1rem 1rem;
    box-shadow: 0 8px 24px rgba(0,0,0,0.06);
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 0.75rem 1rem; font-size: 1rem; }
}

/* ── Hero (homepage) ─────────────────────────────── */
.hero {
  background: linear-gradient(135deg, #0e7490 0%, #1e3a5f 100%);
  color: #fff;
  padding: 6rem 2rem 5rem;
  text-align: center;
}
.hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}
.hero p {
  font-size: 1.15rem;
  max-width: 640px;
  margin: 0 auto 2rem;
  opacity: 0.9;
  line-height: 1.65;
}
.hero .btn {
  display: inline-block;
  background: rgba(255,255,255,0.15);
  color: #fff;
  border: 1.5px solid rgba(255,255,255,0.4);
  padding: 0.75rem 2rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.2s, border-color 0.2s;
}
.hero .btn:hover {
  background: rgba(255,255,255,0.25);
  border-color: rgba(255,255,255,0.7);
  color: #fff;
}

/* ── Article Grid (homepage + articles page) ─────── */
.section { padding: 4rem 2rem; }
.section-header {
  max-width: var(--max-width);
  margin: 0 auto 2.5rem;
}
.section-header h2 {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 600;
  color: var(--color-ink);
  letter-spacing: -0.01em;
}
.section-header .divider {
  width: 48px;
  height: 3px;
  background: var(--color-water);
  margin-top: 0.75rem;
  border-radius: 2px;
}
.article-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 2rem;
}
.article-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  overflow: hidden;
  transition: box-shadow 0.25s, transform 0.25s;
}
.article-card:hover {
  box-shadow: 0 8px 30px rgba(0,0,0,0.06);
  transform: translateY(-2px);
}
.article-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}
.article-card-body {
  padding: 1.25rem 1.5rem 1.5rem;
}
.article-card h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1.35;
  margin-bottom: 0.5rem;
}
.article-card h3 a { color: inherit; }
.article-card h3 a:hover { color: var(--color-accent); }
.article-card p {
  font-size: 0.9rem;
  color: var(--color-muted);
  line-height: 1.55;
  margin-bottom: 1rem;
}
.article-card .read-more {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-water);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}
.article-card .read-more::after {
  content: '→';
  transition: transform 0.2s;
}
.article-card:hover .read-more::after {
  transform: translateX(3px);
}

/* ── Single Article ──────────────────────────────── */
.article-header {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 3rem 2rem 0;
}
.article-header .breadcrumb {
  font-size: 0.82rem;
  color: var(--color-muted);
  margin-bottom: 1.25rem;
}
.article-header .breadcrumb a { color: var(--color-muted); }
.article-header .breadcrumb a:hover { color: var(--color-accent); }
.article-header h1 {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  color: var(--color-ink);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}
.article-meta {
  font-size: 0.85rem;
  color: var(--color-muted);
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}
.article-featured-img {
  max-width: 900px;
  margin: 0 auto 2.5rem;
  padding: 0 2rem;
}
.article-featured-img img {
  border-radius: 10px;
  width: 100%;
}

.article-content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 2rem 3rem;
}
.article-content h2 {
  font-family: var(--font-heading);
  font-size: 1.65rem;
  font-weight: 600;
  color: var(--color-ink);
  margin: 2.5rem 0 0.75rem;
  letter-spacing: -0.01em;
}
.article-content h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-ink);
  margin: 2rem 0 0.5rem;
}
.article-content h4 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-ink);
  margin: 1.5rem 0 0.5rem;
}
.article-content p {
  margin-bottom: 1.25rem;
}
.article-content ul, .article-content ol {
  margin: 0.75rem 0 1.25rem 1.5rem;
}
.article-content li {
  margin-bottom: 0.35rem;
}
.article-content blockquote {
  border-left: 3px solid var(--color-water);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  background: var(--color-water-soft);
  border-radius: 0 8px 8px 0;
  font-style: italic;
  color: var(--color-ink);
}
.article-content img {
  border-radius: 8px;
  margin: 1.5rem 0;
}
.article-content a {
  color: var(--color-water);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.article-content a:hover {
  color: var(--color-accent-hover);
}
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}
.article-content th, .article-content td {
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  text-align: left;
}
.article-content th {
  background: var(--color-surface);
  font-weight: 600;
}

/* Post nav */
.post-nav {
  max-width: var(--content-width);
  margin: 0 auto 3rem;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid var(--color-border);
  padding-top: 2rem;
}
.post-nav a {
  font-size: 0.9rem;
  color: var(--color-muted);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  max-width: 45%;
}
.post-nav a:hover { color: var(--color-accent); }
.post-nav a .label { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; font-weight: 600; }
.post-nav a .title { font-family: var(--font-heading); font-weight: 500; color: var(--color-ink); }
.post-nav a:hover .title { color: var(--color-accent); }
.post-nav .next { text-align: right; margin-left: auto; }

/* ── Contact Page ────────────────────────────────── */
.page-content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 3rem 2rem;
}
.page-content h1 {
  font-family: var(--font-heading);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 1rem;
}
.page-content h2 {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--color-ink);
  margin: 2rem 0 0.75rem;
}
.page-content p {
  margin-bottom: 1rem;
}

/* ── Footer ──────────────────────────────────────── */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 3rem 2rem;
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
}
.footer-brand p {
  font-size: 0.9rem;
  color: var(--color-muted);
  margin-top: 0.75rem;
  max-width: 360px;
  line-height: 1.6;
}
.footer-brand img {
  height: 40px;
  width: auto;
  opacity: 0.8;
}
.site-footer h4 {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 0.75rem;
}
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 0.4rem; }
.footer-links a {
  font-size: 0.88rem;
  color: var(--color-muted);
}
.footer-links a:hover { color: var(--color-accent); }
.footer-bottom {
  max-width: var(--max-width);
  margin: 2rem auto 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: 0.82rem;
  color: var(--color-muted);
}

@media (max-width: 768px) {
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .section { padding: 2.5rem 1.25rem; }
  .article-grid { grid-template-columns: 1fr; }
  .article-header { padding: 2rem 1.25rem 0; }
  .article-content { padding: 0 1.25rem 2rem; }
  .article-featured-img { padding: 0 1.25rem; }
  .post-nav { flex-direction: column; padding: 0 1.25rem; }
  .post-nav a { max-width: 100%; }
}

/* ── Articles list page ──────────────────────────── */
.articles-page .article-grid {
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}
.articles-page .article-card img {
  height: 180px;
}

/* ── Pagination ──────────────────────────────────── */
.pagination {
  max-width: var(--max-width);
  margin: 2rem auto;
  padding: 0 2rem;
  display: flex;
  justify-content: center;
  gap: 0.5rem;
}
.pagination a, .pagination span {
  padding: 0.5rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: 0.9rem;
  color: var(--color-body);
}
.pagination a:hover { background: var(--color-surface); }
.pagination .current {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

/* ── Print ───────────────────────────────────────── */
@media print {
  .site-header, .site-footer, .post-nav { display: none; }
  .article-content { max-width: 100%; padding: 0; }
}