:root {
  --ink: #050810;
  --ink-light: #0c1120;
  --ink-mid: #111927;
  --cyan: #4ECDC4;
  --cyan-dim: #2a8f89;
  --cyan-pale: #b8f0ed;
  --text: #d8e8f0;
  --text-muted: #6888a0;
  --border: rgba(78,205,196,0.12);
  --radius: 3px;
  --max: 1100px;
  --mono: 'Courier New', 'Lucida Console', monospace;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  background: var(--ink);
  color: var(--text);
  font-family: 'Georgia', 'Times New Roman', serif;
  line-height: 1.7;
  min-height: 100vh;
}

/* NAV */
nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(5,8,16,0.97);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max); margin: 0 auto;
  padding: 0 2rem;
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.nav-logo {
  font-family: var(--mono);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  color: var(--cyan);
  text-decoration: none;
}
.nav-logo span { color: var(--text-muted); font-size: 0.7rem; display: block; letter-spacing: 0.03em; }
.nav-links { display: flex; gap: 1.75rem; list-style: none; }
.nav-links a {
  color: var(--text-muted); text-decoration: none;
  font-family: var(--mono); font-size: 0.75rem;
  letter-spacing: 0.05em; transition: color 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--cyan); }
.nav-menu-btn { display: none; background: none; border: none; color: var(--cyan); cursor: pointer; font-size: 1.4rem; }

/* HERO */
.hero {
  min-height: 92vh;
  display: flex; align-items: center;
  position: relative; overflow: hidden;
  border-bottom: 1px solid var(--border);
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background: radial-gradient(ellipse 70% 50% at 50% 40%, rgba(78,205,196,0.06) 0%, transparent 70%);
}
.hero-grid {
  position: absolute; inset: 0; z-index: 0;
  background-image:
    linear-gradient(rgba(78,205,196,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(78,205,196,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
}
.hero-inner {
  position: relative; z-index: 1;
  max-width: var(--max); margin: 0 auto; padding: 6rem 2rem;
}
.hero-label {
  font-family: var(--mono);
  font-size: 0.7rem; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--cyan);
  margin-bottom: 1.5rem;
}
.hero h1 {
  font-family: 'Georgia', serif;
  font-size: clamp(2rem, 5vw, 3.6rem);
  font-weight: normal; line-height: 1.15;
  color: var(--text); max-width: 820px; margin-bottom: 1.5rem;
}
.hero h1 em { color: var(--cyan); font-style: normal; }
.hero p {
  font-size: 1rem; color: var(--text-muted);
  max-width: 560px; margin-bottom: 2.5rem; line-height: 1.8;
}
.btn {
  display: inline-block; padding: 0.7rem 1.75rem;
  border: 1px solid var(--cyan); color: var(--cyan);
  text-decoration: none; font-family: var(--mono);
  font-size: 0.75rem; letter-spacing: 0.08em;
  transition: background 0.2s, color 0.2s; border-radius: var(--radius);
}
.btn:hover { background: var(--cyan); color: var(--ink); }
.btn-ghost { border-color: rgba(78,205,196,0.25); color: var(--text-muted); margin-left: 1rem; }
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); background: transparent; }

/* SECTIONS */
section { padding: 5.5rem 2rem; }
.section-inner { max-width: var(--max); margin: 0 auto; }
.section-label {
  font-family: var(--mono);
  font-size: 0.65rem; letter-spacing: 0.25em;
  text-transform: uppercase; color: var(--cyan);
  margin-bottom: 1rem;
}
section h2 {
  font-family: 'Georgia', serif;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: normal; color: var(--text);
  margin-bottom: 1.5rem; line-height: 1.25;
}
section p { color: var(--text-muted); margin-bottom: 1.2rem; max-width: 680px; }

/* DIVIDER */
.divider { height: 1px; background: var(--border); max-width: var(--max); margin: 0 auto; }

/* CARDS */
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.25rem; margin-top: 2.5rem; }
.card {
  background: var(--ink-light);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.75rem; transition: border-color 0.2s;
}
.card:hover { border-color: rgba(78,205,196,0.3); }
.card-icon { font-size: 1.25rem; margin-bottom: 0.875rem; color: var(--cyan); }
.card h3 { font-family: 'Georgia', serif; font-size: 1rem; font-weight: normal; color: var(--text); margin-bottom: 0.6rem; }
.card p { font-size: 0.875rem; color: var(--text-muted); margin: 0; }

/* CODE BLOCK */
.code-block {
  background: var(--ink-mid); border: 1px solid var(--border);
  border-left: 3px solid var(--cyan); border-radius: var(--radius);
  padding: 1.5rem; margin: 1.5rem 0; overflow-x: auto;
}
.code-block pre { font-family: var(--mono); font-size: 0.8rem; color: var(--cyan-pale); white-space: pre-wrap; }
.code-block .comment { color: var(--text-muted); }

/* TWO COL */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: start; }
@media (max-width: 768px) { .two-col { grid-template-columns: 1fr; gap: 2rem; } }

/* TABLE */
table { width: 100%; border-collapse: collapse; margin-top: 1.75rem; }
th {
  text-align: left; padding: 0.7rem 1rem;
  font-family: var(--mono); font-size: 0.7rem;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--cyan); border-bottom: 1px solid var(--border); font-weight: normal;
}
td { padding: 0.8rem 1rem; color: var(--text-muted); font-size: 0.875rem; border-bottom: 1px solid rgba(78,205,196,0.05); vertical-align: top; }
td strong { color: var(--text); font-weight: normal; }

/* PAGE HEADER */
.page-header {
  padding: 5.5rem 2rem 3.5rem;
  border-bottom: 1px solid var(--border);
  background: radial-gradient(ellipse 50% 40% at 50% 0%, rgba(78,205,196,0.05) 0%, transparent 70%);
}
.page-header-inner { max-width: var(--max); margin: 0 auto; }
.page-header h1 { font-family: 'Georgia', serif; font-size: clamp(1.7rem, 4vw, 2.8rem); font-weight: normal; color: var(--text); margin-bottom: 1rem; }
.page-header p { color: var(--text-muted); max-width: 600px; font-size: 1rem; }

/* BREADCRUMB */
.breadcrumb { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.05em; color: var(--text-muted); margin-bottom: 1.5rem; }
.breadcrumb a { color: var(--cyan); text-decoration: none; }

/* BLOCKQUOTE */
blockquote { border-left: 2px solid var(--cyan); margin: 2rem 0; padding: 1rem 2rem; color: var(--text-muted); font-style: italic; background: var(--ink-light); }

/* FORMS */
.form-group { margin-bottom: 1.5rem; }
label { display: block; font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--cyan); margin-bottom: 0.5rem; }
input, textarea, select {
  width: 100%; background: var(--ink-light);
  border: 1px solid var(--border); border-radius: var(--radius);
  color: var(--text); padding: 0.7rem 1rem;
  font-family: var(--mono); font-size: 0.875rem;
  transition: border-color 0.2s;
}
input:focus, textarea:focus, select:focus { outline: none; border-color: rgba(78,205,196,0.4); }
textarea { min-height: 140px; resize: vertical; }
select option { background: var(--ink-light); }

/* FOOTER */
footer { border-top: 1px solid var(--border); padding: 3rem 2rem; background: var(--ink); }
.footer-inner { max-width: var(--max); margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 3rem; }
.footer-brand p { color: var(--text-muted); font-size: 0.85rem; margin-top: 0.75rem; max-width: 260px; }
.footer-col h4 { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--cyan); margin-bottom: 1rem; font-weight: normal; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 0.5rem; }
.footer-col a { color: var(--text-muted); text-decoration: none; font-size: 0.85rem; transition: color 0.2s; }
.footer-col a:hover { color: var(--cyan); }
.footer-bottom { max-width: var(--max); margin: 2rem auto 0; padding-top: 2rem; border-top: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; }
.footer-bottom p { color: var(--text-muted); font-size: 0.78rem; font-family: var(--mono); }

/* MOBILE */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-links.open { display: flex; flex-direction: column; gap: 0; position: absolute; top: 64px; left: 0; right: 0; background: var(--ink); border-bottom: 1px solid var(--border); padding: 1rem 2rem; }
  .nav-menu-btn { display: block; }
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 2rem; }
}
@media (max-width: 580px) {
  .footer-inner { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 0.5rem; text-align: center; }
}

/* MISC */
.cyan { color: var(--cyan); }
.tag { display: inline-block; padding: 0.2rem 0.6rem; border: 1px solid var(--border); border-radius: 2px; font-family: var(--mono); font-size: 0.65rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--cyan); margin-right: 0.5rem; margin-bottom: 0.5rem; }
.lead { font-size: 1.05rem; color: var(--text); line-height: 1.75; }
ul.styled { list-style: none; padding: 0; }
ul.styled li { padding: 0.5rem 0; border-bottom: 1px solid var(--border); color: var(--text-muted); font-size: 0.9rem; }
ul.styled li::before { content: '>'; color: var(--cyan); margin-right: 0.75rem; font-family: var(--mono); font-size: 0.8rem; }
.mono { font-family: var(--mono); }