:root {
    --bg: #020617;
    --bg-elevated: #0b1120;
    --border-subtle: #1f2937;
    --text-main: #e5e7eb;
    --text-muted: #9ca3af;
    --accent: #38bdf8;
    --accent-soft: rgba(56, 189, 248, 0.12);
    --radius-lg: 0.9rem;
    --shadow-soft: 0 22px 55px rgba(0, 0, 0, 0.7);
    --font-body: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
      "Segoe UI", sans-serif;
  }
  
  *,
  *::before,
  *::after {
    box-sizing: border-box;
  }
  
  html,
  body {
    margin: 0;
    padding: 0;
  }
  
  body {
    background: radial-gradient(circle at top, #111827 0, #020617 50%, #000 100%);
    background-size: 200% 200%;
    color: var(--text-main);
    font-family: var(--font-body);
    line-height: 1.6;
  }
  
  /* Reduce motion if user prefers */
  @media (prefers-reduced-motion: no-preference) {
    body {
      animation: bg-shift 40s ease-in-out infinite alternate;
    }
  }
  
  @keyframes bg-shift {
    0% {
      background-position: 0% 0%;
    }
    50% {
      background-position: 100% 50%;
    }
    100% {
      background-position: 0% 100%;
    }
  }
  
  /* Layout */
  .main-container {
    max-width: 960px;
    margin: 0 auto;
    padding: 2.5rem 1.5rem 3.5rem;
  }
  
  /* Header / hero */
  .site-header {
    text-align: center;
    margin-bottom: 2.5rem;
    padding-bottom: 1.2rem;
    border-bottom: 1px solid var(--border-subtle);
  }
  
  .site-title {
    margin: 0 0 0.4rem;
    font-size: clamp(2rem, 3vw, 2.4rem);
  }
  
  .site-subtitle {
    margin: 0;
    font-size: 0.95rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent);
  }
  
  /* Nav */
  .site-nav {
    margin-top: 1.3rem;
  }
  
  .site-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: inline-flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .site-nav a {
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.95rem;
    position: relative;
    padding-bottom: 0.15rem;
  }
  
  .site-nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.18s ease-out;
  }
  
  .site-nav a:hover {
    color: var(--text-main);
  }
  
  .site-nav a:hover::after,
  .site-nav a.active::after {
    width: 100%;
  }
  
  /* Sections */
  .section {
    margin-bottom: 2rem;
  }
  
  .section-card {
    background: radial-gradient(circle at top left, #111827 0, #020617 60%);
    border-radius: var(--radius-lg);
    padding: 1.5rem 1.6rem;
    border: 1px solid var(--border-subtle);
    box-shadow: var(--shadow-soft);
  }
  
  .section-title {
    margin: 0 0 0.8rem;
    font-size: 1.2rem;
  }
  
  .section-subtext {
    margin: 0 0 1rem;
    font-size: 0.95rem;
    color: var(--text-muted);
  }
  
  /* Header row within section */
  .section-header-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
    justify-content: space-between;
    margin-bottom: 0.4rem;
  }
  
  /* Columns (tech stack + exploring) */
  .columns {
    display: grid;
    gap: 1.5rem;
  }
  
  @media (min-width: 768px) {
    .columns {
      grid-template-columns: 1fr 1fr;
    }
  }
  
  /* Lists inside sections */
  .section-card ul {
    margin-top: 0.4rem;
    padding-left: 1.2rem;
  }
  
  /* Buttons */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.35rem 0.85rem;
    border-radius: 999px;
    font-size: 0.85rem;
    text-decoration: none;
    border: 1px solid transparent;
    cursor: pointer;
    white-space: nowrap;
  }
  
  .btn-primary {
    background: var(--accent);
    color: #0b1120;
    border-color: var(--accent);
  }
  
  .btn-primary:hover {
    filter: brightness(1.05);
  }
  
  .btn-ghost {
    background: rgba(15, 23, 42, 0.7);
    color: var(--text-main);
    border-color: var(--border-subtle);
  }
  
  .btn-ghost:hover {
    background: rgba(15, 23, 42, 0.95);
  }
  
  /* Projects grid */
  .project-grid {
    display: grid;
    gap: 1rem;
    margin-top: 1rem;
  }
  
  @media (min-width: 768px) {
    .project-grid {
      grid-template-columns: repeat(2, minmax(0, 1fr));
    }
  }
  
  .project-card {
    background: rgba(15, 23, 42, 0.8);
    border-radius: 0.75rem;
    padding: 1rem 1.1rem;
    border: 1px solid var(--border-subtle);
  }
  
  .project-card h3 {
    margin: 0 0 0.4rem;
    font-size: 1.02rem;
  }
  
  .project-card p {
    margin: 0 0 0.4rem;
    font-size: 0.94rem;
  }
  
  .project-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
  }
  
  .project-card a {
    font-size: 0.9rem;
    color: var(--accent);
    text-decoration: none;
  }
  
  .project-card a:hover {
    text-decoration: underline;
  }
  
  /* /Now section */
  .now-list {
    margin: 0.4rem 0 0;
    padding-left: 1.2rem;
  }
  
  .now-list li {
    margin-bottom: 0.2rem;
  }
  
  /* Contact */
  .contact-list {
    list-style: none;
    padding-left: 0;
    margin: 0.5rem 0 0;
  }
  
  .contact-list li {
    margin-bottom: 0.15rem;
  }
  
  /* Links */
  a {
    color: var(--accent);
    text-decoration: none;
  }
  
  a:hover {
    text-decoration: underline;
  }
  
  /* Footer */
  .site-footer {
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-subtle);
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
  }
  
  .site-footer p {
    margin: 0.1rem 0;
  }
  
  /* Infrastructure Hermeneutics section (subtle “definition note” styling) */
#infrastructure-hermeneutics .section-card {
  background: linear-gradient(180deg, rgba(56, 189, 248, 0.06), rgba(2, 6, 23, 0));
  border-color: rgba(56, 189, 248, 0.22);
}

#infrastructure-hermeneutics .section-title {
  letter-spacing: 0.02em;
}

#infrastructure-hermeneutics p {
  max-width: 72ch; /* improves readability for a definition block */
}