:root {
  --bg-0: #06080d; --bg-1: #0a0e16; --bg-2: #0e1420;
  --surface: rgba(255,255,255,0.04); --surface-hover: rgba(255,255,255,0.07);
  --border: rgba(255,255,255,0.07); --border-strong: rgba(255,255,255,0.13);
  --text: #eef0f5; --text-dim: #c5cad6; --text-muted: #5a6473;
  --accent: #06b6d4; --accent-glow: rgba(6,182,212,0.4);
  --amber: #f59e0b;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 15px; }
body {
  background: var(--bg-0); color: var(--text);
  font-family: 'Inter', system-ui, sans-serif; line-height: 1.6;
  min-height: 100vh;
}

/* HEADER */
header {
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
  background: rgba(6,8,13,0.85);
  backdrop-filter: blur(16px);
}
.header-inner {
  max-width: 1180px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; gap: 14px;
}
.sub {
  display: inline-flex; align-items: center;
  font-family: 'JetBrains Mono', monospace; font-size: 12px; font-weight: 500;
  letter-spacing: 0.04em; padding: 6px 14px; border-radius: 6px;
  background: rgba(6,182,212,0.10); border: 1px solid rgba(6,182,212,0.30);
  color: var(--accent); white-space: nowrap;
  text-decoration: none; cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}
.sub:hover { background: rgba(6,182,212,0.18); border-color: rgba(6,182,212,0.55); }
.back-link {
  font-family: 'JetBrains Mono', monospace; font-size: 12px;
  color: var(--text-dim); text-decoration: none;
  padding: 6px 12px; border-radius: 8px;
  border: 1px solid var(--border);
  margin-left: auto;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.back-link:hover { color: var(--accent); border-color: var(--accent); background: rgba(6,182,212,0.06); }
.about-link {
    font-family: "JetBrains Mono", monospace; font-size: 11px; font-weight: 500;
    color: var(--text-muted); text-decoration: none; letter-spacing: 0.06em;
    text-transform: uppercase; padding: 4px 2px;
    border-bottom: 1px solid transparent;
    transition: color 0.15s, border-color 0.15s;
    margin-left: 12px;
}
.about-link:hover { color: var(--accent); border-color: var(--accent); }
.header-inner .about-link + .about-link { margin-left: 12px; }
.kofi-header-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px; border-radius: 8px;
  background: rgba(255,255,255,0.04); border: 1px solid var(--border);
  color: var(--text-dim); font-family: 'JetBrains Mono', monospace;
  font-size: 12px; font-weight: 500; text-decoration: none; white-space: nowrap;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.kofi-header-btn:hover { color: var(--accent); border-color: var(--accent); background: rgba(6,182,212,0.06); }
@media (max-width: 768px) { .kofi-header-btn { display: none; } }

/* MAIN */
main { max-width: 1180px; margin: 0 auto; padding: 28px 24px 60px; }

/* SECTION CARDS — every block (including the H1 intro) is a card with
   a subtle tinted background, soft border, and rounded corners. Gives
   the page visible rhythm instead of empty space between text blocks. */
.section {
  background: linear-gradient(180deg, rgba(255,255,255,0.025), rgba(255,255,255,0.012));
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px 28px;
  margin-bottom: 12px;
  transition: border-color 0.18s ease, background 0.18s ease;
}
.section:hover {
  border-color: rgba(6,182,212,0.22);
  background: linear-gradient(180deg, rgba(6,182,212,0.04), rgba(255,255,255,0.02));
}

/* All headings — h1 (What this is) and h2s — share the same cyan look
   with the vertical accent bar prefix. Mixed-case, not uppercase. */
.section h1, .section h2 {
  font-size: 22px; font-weight: 700; letter-spacing: -0.01em;
  line-height: 1.25;
  color: var(--accent);
  margin: 0 0 14px;
  font-family: 'Inter', system-ui, sans-serif;
  text-transform: none;
  background: none;
  -webkit-text-fill-color: var(--accent);
  display: flex; align-items: center; gap: 12px;
}

/* Body paragraphs */
.section p { color: var(--text-dim); font-size: 14.5px; line-height: 1.72; margin-bottom: 12px; }
.section p:last-child { margin-bottom: 0; }
.section p strong { color: var(--text); font-weight: 600; }
.section a { color: var(--accent); text-decoration: none; border-bottom: 1px solid rgba(6,182,212,0.35); transition: border-color 0.15s; }
.section a:hover { border-bottom-color: var(--accent); }

/* SOURCE LIST inside its card — flat list, no extra borders */
.source-list { list-style: none; margin: 14px 0 0; display: grid; gap: 10px; }
.source-list li {
  padding: 12px 14px; border-radius: 8px;
  background: rgba(0,0,0,0.18);
  border: 1px solid rgba(255,255,255,0.04);
  font-size: 13.5px; line-height: 1.6; color: var(--text-dim);
}
.source-list li strong {
  color: var(--text); display: block; margin-bottom: 2px;
  font-size: 14px; font-weight: 600; letter-spacing: -0.005em;
}

/* DISCLAIMER (amber, at the bottom) */
.disclaimer-box {
  background: linear-gradient(180deg, rgba(245,158,11,0.06), rgba(245,158,11,0.02));
  border: 1px solid rgba(245,158,11,0.25);
  border-left: 3px solid var(--amber);
  border-radius: 14px;
  padding: 18px 22px;
  margin-top: 24px;
  display: flex; gap: 14px; align-items: flex-start;
}
.disclaimer-box::before {
  content: "⚠";
  flex: none; font-size: 18px; line-height: 1.4;
  color: var(--amber); opacity: 0.9;
}
.disclaimer-box p {
  color: var(--text); font-size: 13.5px; line-height: 1.7; margin: 0;
}
.disclaimer-box strong { color: var(--text); font-weight: 600; }
.disclaimer-box a { color: var(--amber); text-decoration: none; border-bottom: 1px solid rgba(245,158,11,0.35); }
.disclaimer-box a:hover { border-bottom-color: var(--amber); }

/* FOOTER */
.site-footer {
  text-align: center; padding: 32px 16px 28px;
  color: var(--text-muted); font-size: 13px;
  border-top: 1px solid var(--border);
  max-width: 1180px; margin: 40px auto 0;
}
.site-footer small { display: block; margin-top: 4px; opacity: 0.85; }
.site-footer a.kofi-btn {
  display: inline-flex; align-items: center; gap: 6px;
  margin: 16px auto 0; padding: 9px 20px; border-radius: 99px;
  background: rgba(6,182,212,0.10); border: 1px solid rgba(6,182,212,0.30);
  color: var(--accent); font-weight: 600; font-size: 12px;
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s;
}
.site-footer a.kofi-btn:hover { background: rgba(6,182,212,0.18); border-color: rgba(6,182,212,0.55); }

/* MOBILE */
@media (max-width: 600px) {
  main { padding: 20px 14px 48px; }
  .section { padding: 18px 18px; margin-bottom: 10px; }
  .section h1, .section h2 { font-size: 19px; }
}

/* Mobile nav grid — 4 about-link buttons below the .sub link */
@media (max-width: 768px) {
  .sub-row, .header-inner {
    display: flex !important;
    flex-wrap: wrap !important;
    flex-direction: row !important;
    gap: 6px !important;
    margin-bottom: 12px !important;
    align-items: stretch !important;
  }
  .sub {
    flex: 1 1 100% !important;
    order: 0 !important;
    display: block !important;
    width: 100% !important;
    white-space: normal !important;
    overflow-wrap: anywhere !important;
    line-height: 1.35 !important;
    text-align: center !important;
  }
  .back-link {
    flex: 1 1 100% !important;
    order: 1 !important;
    text-align: center !important;
    margin-left: 0 !important;
  }
  .about-link {
    flex: 1 1 0 !important;
    order: 2 !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    padding: 10px 4px !important;
    border: 1px solid var(--border) !important;
    border-radius: 8px !important;
    background: rgba(6,182,212,0.04) !important;
    color: var(--text-dim) !important;
    font-family: 'JetBrains Mono', monospace !important;
    font-size: 9.5px !important;
    font-weight: 600 !important;
    letter-spacing: 0.04em !important;
    text-transform: uppercase !important;
    text-align: center !important;
    text-decoration: none !important;
    line-height: 1.15 !important;
    margin: 0 !important;
    border-bottom: 1px solid var(--border) !important;
    min-height: 38px;
    min-width: 0;
  }
  .about-link:active,
  .about-link:hover {
    background: rgba(6,182,212,0.14) !important;
    border-color: var(--accent) !important;
    color: var(--accent) !important;
  }
  .kofi-header-btn { display: none !important; }
}

/* Persistent header CTA — same as index.css; About page loads only
   about.css so the header CTA's styles must be duplicated here. */
.sub-row .header-cta-wrap {
  flex-basis: 100% !important;
  display: flex !important;
  justify-content: flex-end !important;
  margin-top: 6px !important;
}
.sub-row a.header-cta {
  display: inline-block !important;
  background: linear-gradient(180deg, rgba(6,182,212,0.10), rgba(6,182,212,0.02)) !important;
  border: 1px solid rgba(6,182,212,0.40) !important;
  border-radius: 8px !important;
  padding: 6px 14px !important;
  font-family: 'JetBrains Mono', monospace !important;
  font-size: 11.5px !important;
  font-weight: 600 !important;
  letter-spacing: 0.06em !important;
  text-transform: none !important;
  color: var(--accent) !important;
  text-decoration: none !important;
  white-space: nowrap !important;
  line-height: 1.4 !important;
  box-sizing: border-box !important;
  transition: background 0.12s, border-color 0.12s, transform 0.1s !important;
  max-width: 100% !important;
}
.sub-row a.header-cta:hover {
  background: linear-gradient(180deg, rgba(6,182,212,0.20), rgba(6,182,212,0.06)) !important;
  border-color: rgba(6,182,212,0.7) !important;
  transform: translateY(-1px) !important;
  color: var(--accent) !important;
}
@media (max-width: 768px) {
  .sub-row .header-cta-wrap {
    justify-content: stretch !important;
    margin-top: 8px !important;
  }
  .sub-row a.header-cta {
    width: 100% !important;
    text-align: center !important;
    white-space: normal !important;
    font-size: 11px !important;
    padding: 8px 12px !important;
  }
}