:root {
  --bg: #fafafa;
  --bg-2: #ffffff;
  --fg: #1a1a1a;
  --muted: #666666;
  --accent: #0055cc;
  --accent-2: #006600;
  --border: #cccccc;
  --max: 960px;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { color: var(--accent); text-decoration: underline; }

.container { max-width: var(--max); margin: 0 auto; padding: 0 24px; }
.muted { color: var(--muted); }
.ok { color: var(--accent); }

.cursor { color: var(--accent); }
.cursor.blink { animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* TOP NAV */
.nav-toggle { display: none; }
.topnav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250,250,250,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.topnav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.brand { color: var(--fg); font-weight: 700; font-size: 18px; }
.brand:hover { text-decoration: none; color: var(--accent); }
.links { display: flex; gap: 20px; align-items: center; }
.links a { color: var(--muted); font-size: 13px; }
.links a:hover { color: var(--accent); text-decoration: none; }
.cta-link { color: var(--accent) !important; }

.hamburger { display: none; flex-direction: column; gap: 4px; cursor: pointer; padding: 6px; }
.hamburger span { width: 22px; height: 2px; background: var(--fg); }

/* HERO */
.hero { padding: 80px 0 60px; text-align: center; }
.ascii-rule { color: var(--accent); letter-spacing: -1px; margin: 12px 0; font-size: 13px; }
.tagline {
  font-size: 32px;
  font-weight: 500;
  margin: 24px 0 8px;
  color: var(--fg);
  min-height: 1.4em;
}
.subtitle {
  color: var(--accent);
  font-size: 18px;
  margin: 0 0 24px;
}
.lede {
  max-width: 640px; margin: 32px auto;
  color: var(--fg); opacity: 0.85;
}
.cta-row { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin: 32px 0 16px; }
.btn {
  display: inline-block;
  padding: 12px 24px;
  font-family: var(--mono);
  font-size: 14px;
  border: 1px solid var(--accent);
  color: var(--accent);
  background: transparent;
  text-decoration: none;
  transition: all 0.15s;
}
.btn:hover { background: var(--accent); color: var(--bg); text-decoration: none; }
.btn-primary { background: var(--accent); color: var(--bg); }
.btn-primary:hover { background: transparent; color: var(--accent); }
.btn-ghost { border-color: var(--muted); color: var(--fg); }
.btn-ghost:hover { border-color: var(--accent); background: transparent; color: var(--accent); }
.hero-meta { font-size: 12px; margin-top: 24px; }

/* SECTIONS */
.section { padding: 64px 0; border-top: 1px solid var(--border); }
.section-head { display: flex; align-items: baseline; gap: 16px; }
.section-num { color: var(--muted); font-size: 13px; }
.section h2 { font-size: 24px; margin: 0; font-weight: 500; }
.section-rule { color: var(--accent); margin: 12px 0 28px; font-size: 13px; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: start; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 16px 0; }
@media (max-width: 720px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

.card {
  border: 1px solid var(--border);
  padding: 20px;
  background: var(--bg-2);
}
.card-h { color: var(--accent); font-weight: 500; margin-bottom: 8px; }
.card-b { color: var(--fg); opacity: 0.85; font-size: 14px; }
.card-link { display: inline-block; margin-top: 12px; font-size: 13px; }

.ascii-box {
  color: var(--accent);
  font-size: 12px;
  line-height: 1.4;
  margin: 0;
  white-space: pre;
  overflow-x: auto;
}

/* STATS */
.stat-grid { margin: 16px 0; }
.stat {
  border: 1px solid var(--border);
  background: var(--bg-2);
  padding: 24px;
  text-align: center;
}
.stat-n {
  font-size: 42px;
  color: var(--accent);
  font-weight: 700;
  line-height: 1;
}
.stat-l { color: var(--muted); font-size: 12px; margin-top: 8px; }

/* TABLE */
.std-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin-top: 8px;
}
.std-table th, .std-table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
.std-table th { color: var(--muted); font-weight: 500; }
.std-table tbody tr:hover { background: var(--bg-2); }

/* ACCORDION */
.accordion { display: flex; flex-direction: column; gap: 8px; }
.acc-item {
  border: 1px solid var(--border);
  background: var(--bg-2);
  overflow: hidden;
}
.acc-item summary {
  padding: 14px 18px;
  cursor: pointer;
  color: var(--fg);
  list-style: none;
  font-size: 14px;
  user-select: none;
}
.acc-item summary::-webkit-details-marker { display: none; }
.acc-item[open] summary { color: var(--accent); border-bottom: 1px solid var(--border); }
.acc-body {
  padding: 16px 18px;
  color: var(--fg);
  opacity: 0.85;
  font-size: 14px;
}

/* CTA */
.cta-section { text-align: center; }
.cta-h { font-size: 28px; color: var(--accent); margin: 24px 0 8px; font-weight: 500; }
.cta-sub { color: var(--muted); margin-bottom: 24px; }

/* FOOTER */
.footer {
  border-top: 1px solid var(--border);
  padding: 48px 0 32px;
  margin-top: 48px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
}
@media (max-width: 720px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
.footer-h { color: var(--accent); font-size: 12px; margin-bottom: 12px; text-transform: lowercase; }
.footer a { display: block; color: var(--muted); font-size: 13px; padding: 3px 0; }
.footer a:hover { color: var(--accent); text-decoration: none; }
.footer-bot { margin-top: 32px; padding-top: 24px; border-top: 1px solid var(--border); font-size: 12px; text-align: center; }

/* SCROLL REVEAL */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in { opacity: 1; transform: translateY(0); }

/* CHAT WIDGET */
.chat-toggle {
  position: fixed; bottom: 24px; right: 24px; z-index: 100;
  width: 56px; height: 56px; border-radius: 50%;
  background: var(--accent); color: var(--bg);
  border: 2px solid var(--accent);
  font-family: var(--mono); font-size: 28px; font-weight: 700;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(0,85,204,0.25);
  transition: transform 0.15s, box-shadow 0.15s;
}
.chat-toggle:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 24px rgba(0,85,204,0.4);
}
.chat-panel {
  position: fixed; bottom: 24px; right: 24px; z-index: 101;
  width: 380px; max-width: calc(100vw - 32px);
  max-height: 560px;
  background: var(--bg-2);
  border: 1px solid var(--accent);
  display: flex; flex-direction: column;
  font-size: 13px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.15);
}
.chat-panel[hidden] { display: none; }
.chat-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--accent);
  font-size: 12px;
}
.chat-close {
  background: transparent; border: none; color: var(--muted);
  font-size: 20px; cursor: pointer; padding: 0 4px;
}
.chat-close:hover { color: var(--accent); }
.chat-intro {
  padding: 14px;
  color: var(--muted);
  font-size: 12px;
  border-bottom: 1px solid var(--border);
}
.chat-log {
  flex: 1;
  overflow-y: auto;
  padding: 12px 14px;
  display: flex; flex-direction: column; gap: 12px;
  min-height: 100px;
  max-height: 340px;
}
.chat-msg {
  white-space: pre-wrap;
  word-wrap: break-word;
  line-height: 1.5;
}
.chat-msg.user {
  color: var(--fg);
  border-left: 2px solid var(--accent-2);
  padding-left: 10px;
}
.chat-msg.assistant {
  color: var(--fg);
  border-left: 2px solid var(--accent);
  padding-left: 10px;
}
.chat-msg .role {
  display: block;
  color: var(--muted);
  font-size: 11px;
  margin-bottom: 4px;
}
.chat-typing {
  color: var(--muted);
  font-style: italic;
  font-size: 12px;
}
.chat-form {
  display: flex; gap: 8px;
  padding: 12px 14px;
  border-top: 1px solid var(--border);
}
.chat-form input {
  flex: 1;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border);
  font-family: var(--mono); font-size: 13px;
  padding: 8px 10px;
}
.chat-form input:focus { outline: none; border-color: var(--accent); }
.chat-form .btn { padding: 8px 14px; font-size: 12px; }
.chat-error {
  padding: 0 14px 12px;
  color: var(--accent-2);
  font-size: 11px;
  min-height: 0;
}
.chat-error:empty { padding: 0; }
@media (max-width: 480px) {
  .chat-panel { width: calc(100vw - 24px); right: 12px; bottom: 76px; }
  .chat-toggle { right: 16px; bottom: 16px; }
}

/* MOBILE NAV */
@media (max-width: 720px) {
  .hamburger { display: flex; }
  .links {
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    padding: 16px 24px;
    gap: 12px;
    display: none;
  }
  .nav-toggle:checked ~ .topnav .links { display: flex; }
  .tagline { font-size: 22px; }
  .cta-h { font-size: 22px; }
  .stat-n { font-size: 32px; }
}