/* AIOvsSEO — dark tech design system. No web fonts (system stack) for fast CWV. */
:root {
  --bg: #0a0a0f;
  --bg-2: #0e0e16;
  --surface: #13131c;
  --surface-2: #181826;
  --border: #23232e;
  --border-2: #2e2e3d;
  --text: #e7e7ee;
  --muted: #9a9aab;
  --faint: #6c6c7d;
  --cyan: #22d3ee;
  --cyan-dim: #0e7490;
  --violet: #a855f7;
  --green: #34d399;
  --max: 760px;
  --wide: 1100px;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(900px 500px at 78% -10%, rgba(34, 211, 238, 0.10), transparent 60%),
    radial-gradient(700px 500px at 0% 0%, rgba(168, 85, 247, 0.08), transparent 55%);
  pointer-events: none;
}

a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 22px; }
.wrap-wide { max-width: var(--wide); margin: 0 auto; padding: 0 22px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(10, 10, 15, 0.78);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.site-header .bar {
  max-width: var(--wide); margin: 0 auto; padding: 14px 22px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.brand {
  font-family: var(--mono); font-weight: 700; font-size: 17px; letter-spacing: -0.02em;
  color: var(--text); display: inline-flex; align-items: center; gap: 8px;
}
.brand:hover { text-decoration: none; }
.brand .vs { color: var(--cyan); }
.brand .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 12px var(--cyan); }
.nav { display: flex; gap: 22px; align-items: center; font-size: 14.5px; }
.nav a { color: var(--muted); font-family: var(--mono); }
.nav a:hover { color: var(--text); text-decoration: none; }
.nav .cta {
  color: var(--bg); background: var(--cyan); padding: 7px 14px; border-radius: 8px; font-weight: 600;
}
.nav .cta:hover { background: #67e8f9; text-decoration: none; }
@media (max-width: 640px) { .nav a:not(.cta) { display: none; } }

/* Hero */
.hero { padding: 92px 0 56px; }
.eyebrow {
  font-family: var(--mono); font-size: 13px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--cyan); margin: 0 0 18px;
}
h1 { font-size: clamp(34px, 6vw, 56px); line-height: 1.05; letter-spacing: -0.03em; margin: 0 0 20px; font-weight: 800; }
.hero p.lead { font-size: 20px; color: var(--muted); max-width: 620px; margin: 0 0 30px; }
.gradient { background: linear-gradient(100deg, var(--cyan), var(--violet)); -webkit-background-clip: text; background-clip: text; color: transparent; }

.btn-row { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: 14.5px; font-weight: 600;
  padding: 12px 20px; border-radius: 10px; border: 1px solid var(--border-2);
}
.btn-primary { background: var(--cyan); color: var(--bg); border-color: var(--cyan); }
.btn-primary:hover { background: #67e8f9; text-decoration: none; }
.btn-ghost { color: var(--text); background: var(--surface); }
.btn-ghost:hover { border-color: var(--cyan); text-decoration: none; }

/* Section */
section { padding: 40px 0; }
.section-label { font-family: var(--mono); font-size: 13px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); margin: 0 0 22px; }
h2 { font-size: clamp(26px, 4vw, 34px); line-height: 1.15; letter-spacing: -0.02em; margin: 48px 0 16px; font-weight: 750; }
h3 { font-size: 21px; margin: 34px 0 12px; letter-spacing: -0.01em; }

/* Article grid */
.grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
@media (max-width: 720px) { .grid { grid-template-columns: 1fr; } }
.card {
  display: block; background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
  padding: 24px; transition: border-color .15s, transform .15s, background .15s;
}
.card:hover { border-color: var(--cyan-dim); background: var(--surface-2); transform: translateY(-2px); text-decoration: none; }
.card .tag { font-family: var(--mono); font-size: 12px; letter-spacing: .06em; text-transform: uppercase; color: var(--cyan); }
.card h3 { margin: 12px 0 8px; color: var(--text); font-size: 20px; }
.card p { color: var(--muted); margin: 0; font-size: 15.5px; }
.card .read { font-family: var(--mono); font-size: 12.5px; color: var(--faint); margin-top: 14px; display: block; }

/* Article body */
.article { padding: 56px 0 40px; }
.breadcrumb { font-family: var(--mono); font-size: 13px; color: var(--faint); margin: 0 0 22px; }
.breadcrumb a { color: var(--muted); }
.meta { font-family: var(--mono); font-size: 13.5px; color: var(--faint); margin: 0 0 8px; display: flex; gap: 14px; flex-wrap: wrap; }
.article-body p, .article-body li { color: #d3d3df; }
.article-body h2 { color: var(--text); }
.article-body ul, .article-body ol { padding-left: 22px; }
.article-body li { margin: 8px 0; }
.article-body strong { color: #fff; }
.tldr {
  background: var(--surface); border: 1px solid var(--border-2); border-left: 3px solid var(--cyan);
  border-radius: 10px; padding: 18px 22px; margin: 28px 0;
}
.tldr .label { font-family: var(--mono); font-size: 12px; letter-spacing: .1em; text-transform: uppercase; color: var(--cyan); margin: 0 0 8px; }
.tldr p { margin: 0; color: var(--text); }

table { width: 100%; border-collapse: collapse; margin: 26px 0; font-size: 15px; }
th, td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--border); }
th { font-family: var(--mono); font-size: 12.5px; letter-spacing: .05em; text-transform: uppercase; color: var(--cyan); }
td { color: #d3d3df; }
tr:hover td { background: var(--surface); }

blockquote { margin: 26px 0; padding: 4px 0 4px 20px; border-left: 3px solid var(--violet); color: var(--muted); font-style: italic; }
code { font-family: var(--mono); font-size: .9em; background: var(--surface-2); padding: 2px 6px; border-radius: 5px; color: #67e8f9; }
pre { background: var(--bg-2); border: 1px solid var(--border); border-radius: 12px; padding: 18px; overflow-x: auto; }
pre code { background: none; padding: 0; color: #d3d3df; }

.stat { font-family: var(--mono); color: var(--cyan); font-weight: 700; }

/* FAQ */
.faq { margin: 36px 0; }
.faq details {
  border: 1px solid var(--border); border-radius: 12px; padding: 4px 20px; margin: 10px 0; background: var(--surface);
}
.faq summary { cursor: pointer; font-weight: 650; padding: 14px 0; list-style: none; color: var(--text); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: "+ "; color: var(--cyan); font-family: var(--mono); }
.faq details[open] summary::before { content: "− "; }
.faq details p { color: var(--muted); margin: 0 0 16px; }

/* Author / next */
.next-read { display: grid; grid-template-columns: repeat(2,1fr); gap: 14px; margin: 40px 0; }
@media (max-width: 640px){ .next-read { grid-template-columns: 1fr; } }

/* Contact form */
.form-card { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 30px; }
.field { margin: 0 0 18px; }
.field label { display: block; font-family: var(--mono); font-size: 13px; color: var(--muted); margin: 0 0 7px; }
.field input, .field textarea {
  width: 100%; background: var(--bg-2); border: 1px solid var(--border-2); border-radius: 9px;
  color: var(--text); font: inherit; font-size: 15px; padding: 11px 13px;
}
.field input:focus, .field textarea:focus { outline: none; border-color: var(--cyan); }
.field textarea { min-height: 120px; resize: vertical; }
.hp { position: absolute; left: -9999px; opacity: 0; height: 0; width: 0; }
.form-msg { font-family: var(--mono); font-size: 14px; margin: 14px 0 0; }
.form-msg.ok { color: var(--green); }
.form-msg.err { color: #f87171; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); margin-top: 64px; padding: 40px 0; color: var(--faint); font-size: 14px; }
.site-footer .cols { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 24px; }
.site-footer a { color: var(--muted); }
.site-footer .links { display: flex; gap: 18px; flex-wrap: wrap; font-family: var(--mono); font-size: 13.5px; }

hr { border: none; border-top: 1px solid var(--border); margin: 40px 0; }
.divider-mono { font-family: var(--mono); color: var(--faint); font-size: 13px; text-align: center; margin: 50px 0; letter-spacing: .2em; }