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

:root {
  --accent: #1a3a5c;
  --accent-dark: #0f2440;
  --accent-bg: rgba(26,58,92,0.07);
  --black: #0f0f0f;
  --gray-100: #f5f5f3;
  --gray-200: #ebebea;
  --gray-400: #b0afa8;
  --gray-600: #6b6b66;
  --white: #ffffff;
  --font-sans: 'DM Sans', -apple-system, sans-serif;
  --font-serif: 'DM Serif Display', Georgia, serif;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
}

body { font-family: var(--font-sans); color: var(--black); background: var(--gray-100); -webkit-font-smoothing: antialiased; }

/* ── Wordmark ── */
.nav-logo { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; }
.nav-logo img { height: 28px; width: auto; }
.logo-spring-text { font-family: var(--font-sans); font-size: 1rem; font-weight: 600; color: var(--black); }
.logo-by-text { font-weight: 400; color: var(--gray-400); }
.logo-amaze-text { font-family: var(--font-sans); font-size: 1rem; font-weight: 600; color: var(--black); }
.logo-commerce-text { font-family: var(--font-sans); font-size: 1rem; font-weight: 600; color: #00C566; margin-left: 4px; }

/* ── Top Nav ── */
.topnav {
  position: sticky; top: 0; z-index: 100;
  background: var(--white); border-bottom: 1px solid var(--gray-200);
  padding: 0 2rem; height: 56px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.topnav-right { display: flex; align-items: center; gap: 8px; }
.nav-tab {
  font-size: 0.8rem; font-weight: 500; padding: 6px 14px;
  border-radius: 100px; text-decoration: none;
  border: 1.5px solid transparent; transition: all 0.15s;
  white-space: nowrap;
}
.nav-tab.active {
  background: var(--accent); color: var(--white);
  border-color: var(--accent);
}
.nav-tab.inactive {
  color: var(--gray-600); border-color: var(--gray-200);
}
.nav-tab.inactive:hover { border-color: var(--accent); color: var(--accent); }
.back-link { font-size: 0.82rem; color: var(--gray-600); text-decoration: none; transition: color 0.15s; }
.back-link:hover { color: var(--accent); }

/* ── Site Header ── */
.site-header { background: var(--white); border-bottom: 1px solid var(--gray-200); padding: 56px 2rem 48px; text-align: center; }
.header-inner { max-width: 600px; margin: 0 auto; }
.header-eyebrow { font-size: 0.7rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); margin-bottom: 12px; }
.site-header h1 { font-family: var(--font-serif); font-size: 2.75rem; font-weight: 400; line-height: 1.1; color: var(--black); margin-bottom: 12px; letter-spacing: -0.02em; }
.header-sub { font-size: 1rem; color: var(--gray-600); margin-bottom: 32px; line-height: 1.5; }

/* ── Search ── */
.search-wrap { position: relative; max-width: 440px; margin: 0 auto; }
.search-icon { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: var(--gray-400); pointer-events: none; }
#search { width: 100%; padding: 12px 16px 12px 42px; font-family: var(--font-sans); font-size: 0.95rem; border: 1.5px solid var(--gray-200); border-radius: var(--radius-md); background: var(--gray-100); outline: none; transition: border-color 0.15s, background 0.15s; }
#search:focus { border-color: var(--accent); background: var(--white); }
#search-results { display: none; position: absolute; width: 100%; background: var(--white); border: 1.5px solid var(--gray-200); border-radius: var(--radius-md); margin-top: 6px; list-style: none; z-index: 50; box-shadow: 0 8px 32px rgba(0,0,0,0.08); overflow: hidden; }
#search-results li a { display: flex; flex-direction: column; padding: 12px 16px; text-decoration: none; color: inherit; border-bottom: 1px solid var(--gray-200); transition: background 0.1s; }
#search-results li:last-child a { border-bottom: none; }
#search-results li a:hover { background: var(--gray-100); }
#search-results li a strong { font-size: 0.9rem; font-weight: 500; color: var(--black); }
#search-results li a span { font-size: 0.75rem; color: var(--gray-400); margin-top: 2px; }
#search-results .no-results { padding: 14px 16px; font-size: 0.875rem; color: var(--gray-400); }

/* ── Cards Grid ── */
#main-content { max-width: 1120px; margin: 48px auto; padding: 0 24px; display: grid; grid-template-columns: repeat(auto-fill, minmax(310px, 1fr)); gap: 20px; }
.category-card { background: var(--white); border-radius: var(--radius-lg); border: 1px solid var(--gray-200); padding: 28px; transition: box-shadow 0.2s, border-color 0.2s; }
.category-card:hover { border-color: var(--accent); box-shadow: 0 4px 20px rgba(26,58,92,0.08); }
.category-card h2 { font-size: 0.68rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1.5px solid var(--gray-200); }
.category-card ul { list-style: none; }
.category-card ul li { margin-bottom: 10px; }
.category-card ul li a { font-size: 0.875rem; color: var(--black); text-decoration: none; line-height: 1.4; display: inline-flex; align-items: center; gap: 7px; transition: color 0.15s; }
.category-card ul li a::before { content: ''; display: inline-block; width: 4px; height: 4px; border-radius: 50%; background: var(--gray-400); flex-shrink: 0; transition: background 0.15s; }
.category-card ul li a:hover { color: var(--accent); }
.category-card ul li a:hover::before { background: var(--accent); }

/* ── Article Page ── */
main.article { max-width: 900px; margin: 0 auto; padding: 48px 48px 96px; }
.article-meta-top { margin-bottom: 20px; }
.breadcrumb-pill { display: inline-block; font-size: 0.68rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); background: var(--accent-bg); padding: 4px 10px; border-radius: 100px; }
main.article h1 { font-family: var(--font-serif); font-size: 2.25rem; font-weight: 400; line-height: 1.2; color: var(--black); margin-bottom: 8px; letter-spacing: -0.02em; }
.meta { font-size: 0.8rem; color: var(--gray-400); margin-top: 10px; margin-bottom: 24px; display: block; }
.divider { border: none; border-top: 1px solid var(--gray-200); margin-bottom: 36px; }

/* Article body */
.body { line-height: 1.8; font-size: 0.95rem; color: #2a2a2a; }
.body h2 { font-family: var(--font-serif); font-size: 1.5rem; font-weight: 400; margin: 36px 0 12px; color: var(--black); }
.body h3 { font-size: 1.05rem; font-weight: 600; margin: 28px 0 10px; color: var(--black); }
.body h4 { font-size: 0.95rem; font-weight: 600; margin: 20px 0 8px; color: var(--black); }
.body p { margin-bottom: 16px; }
.body ul, .body ol { margin: 0 0 16px 24px; }
.body li { margin-bottom: 6px; }
.body a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.body a:hover { color: var(--accent-dark); }
.body img { max-width: 100%; border-radius: var(--radius-md); margin: 20px 0; border: 1px solid var(--gray-200); }
.body hr { border: none; border-top: 1px solid var(--gray-200); margin: 32px 0; }
.body table { width: 100%; border-collapse: collapse; margin-bottom: 20px; font-size: 0.875rem; }
.body th, .body td { border: 1px solid var(--gray-200); padding: 10px 14px; text-align: left; }
.body th { background: var(--gray-100); font-weight: 600; font-size: 0.8rem; letter-spacing: 0.03em; }
.body blockquote { border-left: 3px solid var(--accent); padding: 4px 0 4px 20px; color: var(--gray-600); font-style: italic; margin: 20px 0; }
.body code { background: var(--gray-100); padding: 2px 6px; border-radius: var(--radius-sm); font-size: 0.85em; font-family: monospace; }
.body pre { background: var(--gray-100); padding: 16px; border-radius: var(--radius-md); overflow-x: auto; margin-bottom: 16px; }

/* Banners */
.banner { padding: 14px 18px; border-radius: var(--radius-md); margin-bottom: 28px; font-size: 0.875rem; }
.banner.outdated { background: #fff8e1; border: 1px solid #f6d860; color: #7a5c00; }

/* ── Footer ── */
footer { background: var(--white); border-top: 1px solid var(--gray-200); margin-top: 48px; }
.footer-main { max-width: 1120px; margin: 0 auto; display: grid; grid-template-columns: repeat(4, 1fr); gap: 40px; padding: 56px 24px 40px; }
.footer-col { display: flex; flex-direction: column; gap: 12px; }
.footer-col h4 { font-size: 0.7rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--black); margin-bottom: 4px; }
.footer-col a { font-size: 0.875rem; color: var(--gray-600); text-decoration: none; transition: color 0.15s; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom { max-width: 1120px; margin: 0 auto; padding: 24px 24px 32px; border-top: 1px solid var(--gray-200); display: flex; align-items: center; gap: 16px; }
.footer-logo { display: flex; align-items: center; gap: 8px; font-size: 1rem; font-weight: 600; color: var(--black); }
.footer-copy { font-size: 0.8rem; color: var(--gray-400); }

/* ── Responsive ── */
@media (max-width: 640px) {
  .site-header { padding: 40px 1.5rem 36px; }
  .site-header h1 { font-size: 2rem; }
  #main-content { grid-template-columns: 1fr; padding: 0 16px; margin: 32px auto; }
  main.article { padding: 32px 20px 64px; }
  main.article h1 { font-size: 1.75rem; }
  .topnav { padding: 0 1rem; }
  .footer-main { grid-template-columns: repeat(2, 1fr); padding: 40px 16px 24px; }
  .nav-tab { font-size: 0.72rem; padding: 5px 10px; }
}