*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg:         #000000;
  --text:       #c8c8c8;
  --text-muted: #545454;
  --border:     #242424;
  --border-hi:  #404040;
  --violet:     #cc99ff;
  --violet-dim: #7744aa;
  --teal:       #55ddbb;
  --green:      #33ff66;
  --red-dim:    #993333;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  min-height: 100vh;
}

/* ── Ambient UI glow ────────────────────────────────────────── */
.ui {
  position: fixed;
  inset: 0;
  z-index: 999;
  pointer-events: none;
}

.ui::before {
  content: "";
  position: absolute;
  inset: 0;
  animation: ui-glow 3s ease-in-out infinite;
  background:
    linear-gradient(to bottom, rgba(255,255,255,0.6), transparent) top    / 100% 30px no-repeat,
    linear-gradient(to top,    rgba(255,255,255,0.6), transparent) bottom / 100% 30px no-repeat,
    linear-gradient(to right,  rgba(255,255,255,0.6), transparent) left   / 30px 100% no-repeat,
    linear-gradient(to left,   rgba(255,255,255,0.6), transparent) right  / 30px 100% no-repeat;
}

@keyframes ui-glow {
  0%, 100% { opacity: 0.3; }
  50%       { opacity: 1;   }
}

/* ── Corner navigation ──────────────────────────────────────── */
.nav-back,
.nav-home {
  position: fixed;
  top: 0;
  z-index: 30;
  padding: 8px 14px;
  font-family: "Monaco", "Menlo", "Consolas", monospace;
  font-size: 0.55rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--text-muted);
  background: var(--bg);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s ease;
}

.nav-back {
  left: 0;
  border-right: 1px solid var(--border-hi);
  border-bottom: 1px solid var(--border-hi);
}

.nav-home {
  right: 0;
  border-left: 1px solid var(--border-hi);
  border-bottom: 1px solid var(--border-hi);
}

.nav-back:hover,
.nav-home:hover { color: var(--text); }

/* ── Content ────────────────────────────────────────────────── */
.content {
  max-width: 680px;
  margin: 0 auto;
  padding: 5rem 2.75rem 7rem;
}

.content > *:first-child { margin-top: 0; }

/* ── Typography ─────────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  color: var(--violet);
  font-weight: 700;
  line-height: 1.25;
  margin: 2.5rem 0 0.75rem;
}

h1 {
  font-size: 1.6rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  border-bottom: 2px solid var(--violet-dim);
  padding-bottom: 0.4rem;
}

h2 {
  font-size: 1.25rem;
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--border-hi);
  padding-bottom: 0.3rem;
}

h3 { font-size: 1.05rem; }

h4, h5, h6 {
  font-size: 0.9rem;
  color: var(--violet-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

p { margin: 0.85rem 0; }

a {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.12s;
}

a:hover { border-bottom-color: var(--teal); }

strong { color: var(--teal); font-weight: 700; }
em     { font-style: italic; opacity: 0.88; }

ul, ol { margin: 0.85rem 0; padding-left: 1.75rem; }
li     { margin: 0.3rem 0; }

hr {
  border: none;
  border-top: 1px solid var(--red-dim);
  margin: 2.5rem 0;
  opacity: 0.45;
}

code {
  font-family: "Courier New", monospace;
  font-size: 0.84em;
  background: #080808;
  color: var(--teal);
  padding: 0.1em 0.4em;
  border: 1px solid var(--border-hi);
}

pre {
  background: #000;
  border: 1px solid var(--border-hi);
  border-top: none;
  padding: 2.1rem 1.25rem 1.1rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  position: relative;
}

pre::before {
  content: '◆  CODE';
  position: absolute;
  top: 0; left: 0; right: 0;
  background: #141414;
  border-top: 1px solid var(--border-hi);
  border-bottom: 1px solid var(--border-hi);
  padding: 0.28rem 0.8rem;
  font-family: "Courier New", monospace;
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  color: var(--text-muted);
  text-transform: uppercase;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--green);
  font-size: 0.875rem;
  line-height: 1.65;
  text-shadow: 0 0 10px rgba(51, 255, 102, 0.45);
}

blockquote {
  border: none;
  background: none;
  position: relative;
  margin: 2.25rem 0;
  padding: 0.25rem 1.25rem 0.25rem 3rem;
  font-style: italic;
}

blockquote::before {
  content: '\201C';
  position: absolute;
  left: -0.25rem;
  top: -1rem;
  font-size: 5.5rem;
  font-family: Georgia, "Times New Roman", serif;
  color: var(--violet);
  opacity: 0.50;
  line-height: 1;
  pointer-events: none;
  user-select: none;
}

blockquote p {
  color: var(--text-muted);
  line-height: 1.95;
  margin: 0.25rem 0;
}

::-webkit-scrollbar       { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: #000; }
::-webkit-scrollbar-thumb { background: var(--border-hi); }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

@media (max-width: 600px) {
  .content { padding: 4.5rem 1.25rem 5rem; }
}