:root {
  --seo-bg: #0a0a0a;
  --seo-surface: #141414;
  --seo-text: #f4f4f5;
  --seo-muted: #a1a1aa;
  --seo-volt: #d4ff00;
  --seo-border: #27272a;
  --seo-max: 720px;
  --seo-wide: 960px;
}

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

html { scroll-behavior: smooth; }

body.seo-page {
  margin: 0;
  font-family: "Space Grotesk", system-ui, sans-serif;
  background: var(--seo-bg);
  color: var(--seo-text);
  line-height: 1.65;
  font-size: 1.05rem;
  -webkit-font-smoothing: antialiased;
}

.seo-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 24px;
  background: rgba(10, 10, 10, 0.95);
  border-bottom: 1px solid var(--seo-border);
  backdrop-filter: blur(8px);
}

.seo-nav-brand {
  font-family: "Syne", sans-serif;
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: -0.025em;
  color: var(--seo-text);
  text-decoration: none;
  display: flex;
  flex-direction: column;
}

.seo-nav-brand:hover {
  color: var(--seo-volt);
  transition: color 0.15s;
}

.seo-nav-links {
  display: flex;
  align-items: center;
  gap: 48px;
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.seo-nav-links a:not(.seo-nav-cta) {
  color: var(--seo-text);
  text-decoration: none;
  position: relative;
}

.seo-nav-links a:not(.seo-nav-cta):hover,
.seo-nav-links a:not(.seo-nav-cta)[aria-current="page"] {
  color: var(--seo-volt);
  transition: color 0.15s;
}

.seo-nav-links a:not(.seo-nav-cta)::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--seo-volt);
  transition: width 0.15s;
}

.seo-nav-links a:not(.seo-nav-cta):hover::after,
.seo-nav-links a:not(.seo-nav-cta)[aria-current="page"]::after {
  width: 100%;
}

.seo-nav-cta {
  background: var(--seo-volt);
  color: var(--seo-bg) !important;
  padding: 8px 16px;
  font-weight: 700;
  text-decoration: none;
  transition: background-color 0.15s;
}

.seo-nav-cta:hover {
  background: #fff;
}

.seo-main {
  max-width: var(--seo-wide);
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.seo-main.narrow { max-width: var(--seo-max); }

.seo-eyebrow {
  font-family: ui-monospace, monospace;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--seo-volt);
  margin: 0 0 12px;
}

.seo-h1 {
  font-family: "Syne", sans-serif;
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 20px;
  text-transform: uppercase;
}

.seo-lead {
  font-size: 1.15rem;
  color: var(--seo-muted);
  margin: 0 0 32px;
  max-width: 52ch;
}

.seo-citability {
  background: var(--seo-surface);
  border: 1px solid var(--seo-border);
  border-left: 3px solid var(--seo-volt);
  padding: 20px 24px;
  margin: 0 0 40px;
  font-size: 1rem;
  line-height: 1.7;
}

.seo-citability strong { color: var(--seo-volt); }

.seo-section { margin-bottom: 48px; }

.seo-h2 {
  font-family: "Syne", sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  margin: 40px 0 16px;
  text-transform: uppercase;
  letter-spacing: -0.02em;
}

.seo-h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 28px 0 12px;
}

.seo-page p { margin: 0 0 16px; }

.seo-page ul, .seo-page ol {
  margin: 0 0 20px;
  padding-left: 1.4rem;
}

.seo-page li { margin-bottom: 8px; }

.seo-page a {
  color: var(--seo-volt);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.seo-page table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.95rem;
}

.seo-page th, .seo-page td {
  border: 1px solid var(--seo-border);
  padding: 10px 14px;
  text-align: left;
}

.seo-page th {
  background: var(--seo-surface);
  font-weight: 600;
}

.seo-page blockquote {
  margin: 24px 0;
  padding: 16px 20px;
  border-left: 3px solid var(--seo-volt);
  background: var(--seo-surface);
  color: var(--seo-muted);
}

.seo-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 32px 0;
}

.seo-btn {
  display: inline-block;
  padding: 14px 24px;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-decoration: none !important;
  border: 1px solid var(--seo-volt);
  color: var(--seo-volt) !important;
}

.seo-btn-primary {
  background: var(--seo-volt);
  color: var(--seo-bg) !important;
  border-color: var(--seo-volt);
}

.seo-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin: 32px 0;
}

.seo-card {
  background: var(--seo-surface);
  border: 1px solid var(--seo-border);
  padding: 24px;
}

.seo-card h3 {
  margin-top: 0;
  font-family: "Syne", sans-serif;
  text-transform: uppercase;
  font-size: 1rem;
}

.seo-card .tag {
  font-family: ui-monospace, monospace;
  font-size: 0.65rem;
  text-transform: uppercase;
  color: var(--seo-volt);
}

.seo-footer {
  border-top: 1px solid var(--seo-border);
  padding: 40px 24px;
  margin-top: 60px;
  font-size: 0.85rem;
  color: var(--seo-muted);
}

.seo-footer-inner {
  max-width: var(--seo-wide);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 24px;
}

.seo-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.seo-footer a {
  color: var(--seo-muted);
  text-decoration: none;
}

.seo-footer a:hover { color: var(--seo-volt); }

.seo-meta {
  font-family: ui-monospace, monospace;
  font-size: 0.75rem;
  color: var(--seo-muted);
  margin-bottom: 24px;
}

.seo-blog-list { list-style: none; padding: 0; margin: 0; }

.seo-blog-list li {
  border-bottom: 1px solid var(--seo-border);
  padding: 20px 0;
}

.seo-blog-list a {
  font-size: 1.15rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--seo-text);
}

.seo-blog-list a:hover { color: var(--seo-volt); }

.seo-blog-list .excerpt {
  margin: 8px 0 0;
  color: var(--seo-muted);
  font-size: 0.95rem;
}

.seo-lang-switch {
  font-size: 0.75rem;
  margin-left: auto;
}

.seo-lang-switch a { color: var(--seo-muted); }

/* ═══════════════════════════════════════════════════════
   MOBILE — /p/slug portfolio page + all SEO pages
════════════════════════════════════════════════════════ */
@media (max-width: 640px) {

    body.seo-page {
        font-size: 1rem;
    }

    /* Nav: compact, single-row brand + CTA stacked */
    .seo-nav {
        padding: 12px 16px;
        gap: 8px;
    }

    .seo-nav-links {
        width: 100%;
        gap: 6px 14px;
        font-size: 0.72rem;
        order: 3;
    }

    /* CTA button: full-width, tall tap target */
    .seo-nav-cta {
        display: flex;
        align-items: center;
        justify-content: center;
        min-height: 44px;
        padding: 10px 20px;
        flex-grow: 0;
        letter-spacing: 0.04em;
    }

    /* Main content: tighter top, safe-area bottom */
    .seo-main {
        padding: 28px 16px max(48px, env(safe-area-inset-bottom, 48px));
    }

    .seo-main.narrow {
        max-width: 100%;
    }

    /* Headings */
    .seo-h1 {
        font-size: clamp(1.75rem, 8vw, 2.5rem);
        letter-spacing: -0.02em;
        margin-bottom: 14px;
    }

    .seo-h2 {
        font-size: 1.25rem;
        margin: 28px 0 12px;
    }

    .seo-lead {
        font-size: 1rem;
        margin-bottom: 24px;
    }

    /* Buttons: full-width + touch height */
    .seo-btn {
        display: block;
        text-align: center;
        min-height: 48px;
        padding: 14px 20px;
        line-height: 1.2;
    }

    .seo-cta-row {
        flex-direction: column;
        gap: 10px;
    }

    /* Cards: ensure they fill the width */
    .seo-card-grid {
        grid-template-columns: 1fr;
        margin: 20px 0;
    }

    /* Tables: horizontal scroll */
    .seo-page table {
        font-size: 0.85rem;
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    /* Citability block */
    .seo-citability {
        padding: 16px;
        font-size: 0.95rem;
    }

    /* Footer */
    .seo-footer {
        padding: 28px 16px max(24px, env(safe-area-inset-bottom, 24px));
    }

    .seo-footer-inner {
        flex-direction: column;
        gap: 16px;
    }

    .seo-footer nav {
        flex-wrap: wrap;
        gap: 8px 16px;
    }

    /* Blog list */
    .seo-blog-list a {
        font-size: 1rem;
    }
}