/* NoETL landing. Dark-first, single stylesheet, no framework.
   Colours are defined once as tokens; a light preference remaps the tokens
   rather than re-styling components. */
:root {
  --bg: #0b0d10;
  --bg-2: #11141a;
  --bg-3: #171b23;
  --line: #242a35;
  --line-2: #2f3743;
  --fg: #e6e9ef;
  --fg-2: #a7b0c0;
  --fg-3: #6f7a8d;
  --accent: #5dd6a0;
  --accent-2: #3aa87a;
  --warn: #e0b44a;
  --err: #e4736b;
  --info: #6aa9e9;
  --radius: 10px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #fbfcfd; --bg-2: #fff; --bg-3: #f2f5f8;
    --line: #dde3ea; --line-2: #c8d2dd;
    --fg: #121820; --fg-2: #43505f; --fg-3: #6d7a8a;
    --accent: #1d8a62; --accent-2: #14664a;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font-family: var(--sans); font-size: 16px; line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 22px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { line-height: 1.25; margin: 0; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}
.skip {
  position: absolute; left: -9999px; top: 0; background: var(--accent);
  color: #001; padding: 10px 16px; z-index: 50;
}
.skip:focus { left: 8px; top: 8px; }

/* header */
.top { border-bottom: 1px solid var(--line); background: rgba(11,13,16,.82); backdrop-filter: blur(8px);
       position: sticky; top: 0; z-index: 20; }
@media (prefers-color-scheme: light) { :root:not([data-theme="dark"]) .top { background: rgba(255,255,255,.85); } }
.top-inner { display: flex; align-items: center; justify-content: space-between; height: 58px; }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 650; letter-spacing: .02em; }
.mark { color: var(--accent); }
.brand-name { font-family: var(--mono); }
.top-nav { display: flex; gap: 20px; font-size: 14px; }
.top-nav a { color: var(--fg-2); }
.top-nav a:hover { color: var(--fg); }

/* hero */
.hero { padding: 68px 22px 40px; }
.eyebrow {
  display: inline-block; margin: 0 0 18px; padding: 5px 12px;
  border: 1px solid var(--accent-2); border-radius: 999px;
  color: var(--accent); font-family: var(--mono); font-size: 12.5px;
  letter-spacing: .09em; text-transform: uppercase;
}
.hero h1 { font-size: clamp(30px, 5vw, 50px); letter-spacing: -.02em; margin-bottom: 18px; }
.lede { font-size: clamp(16px, 2vw, 18.5px); color: var(--fg-2); max-width: 66ch; margin: 0 0 26px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 18px; }
.hero-note { font-size: 14px; color: var(--fg-3); max-width: 62ch; margin: 0; }

.btn {
  display: inline-block; padding: 10px 18px; border-radius: var(--radius);
  border: 1px solid var(--line-2); background: var(--bg-3); color: var(--fg);
  font: inherit; font-size: 14.5px; cursor: pointer; transition: border-color .15s, background .15s;
}
.btn:hover { border-color: var(--fg-3); text-decoration: none; }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #04140d; font-weight: 600; }
.btn-primary:hover { background: var(--accent-2); border-color: var(--accent-2); }

/* sections */
.section { padding: 54px 22px; border-top: 1px solid var(--line); }
.section-head { display: flex; align-items: center; gap: 14px; margin-bottom: 10px; flex-wrap: wrap; }
.section-head h2 { font-size: clamp(21px, 3vw, 28px); letter-spacing: -.01em; }
.section-sub { color: var(--fg-2); max-width: 74ch; margin: 0 0 26px; font-size: 15.5px; }
.sim-badge {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .08em; text-transform: uppercase;
  color: var(--warn); border: 1px solid var(--warn); border-radius: 999px; padding: 3px 10px;
  cursor: help;
}

/* demo */
.domain-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }
.domain-tab {
  padding: 8px 15px; border-radius: 999px; border: 1px solid var(--line-2);
  background: var(--bg-2); color: var(--fg-2); font: inherit; font-size: 14px; cursor: pointer;
}
.domain-tab:hover { color: var(--fg); border-color: var(--fg-3); }
.domain-tab.active { background: var(--accent); border-color: var(--accent); color: #04140d; font-weight: 600; }
.demo-meta { display: flex; justify-content: space-between; gap: 18px; align-items: flex-start;
             flex-wrap: wrap; margin-bottom: 16px; }
.demo-title { font-size: 18px; margin-bottom: 4px; }
.demo-desc { color: var(--fg-2); font-size: 14.5px; margin: 0; max-width: 62ch; }
.demo-controls { display: flex; gap: 8px; flex-wrap: wrap; }
.demo-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 860px) { .demo-grid { grid-template-columns: 1fr; } }

.pane { border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-2); overflow: hidden; }
.pane-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 9px 13px; border-bottom: 1px solid var(--line); background: var(--bg-3);
}
.pane-head h4 { font-family: var(--mono); font-size: 12.5px; font-weight: 600; color: var(--fg-2); letter-spacing: .04em; }
.pane-tag { font-family: var(--mono); font-size: 11px; color: var(--fg-3); text-transform: uppercase; letter-spacing: .07em; }
.pane-tag-sim { color: var(--warn); }
.yaml { margin: 0; padding: 14px; overflow-x: auto; max-height: 330px; }
.yaml code { font-family: var(--mono); font-size: 12.5px; line-height: 1.65; color: var(--fg-2); white-space: pre; }

.events { list-style: none; margin: 0; padding: 8px; max-height: 330px; overflow-y: auto; font-family: var(--mono); font-size: 12px; }
.event { display: grid; grid-template-columns: minmax(130px, auto) 1fr auto; gap: 8px;
         padding: 4px 6px; border-radius: 6px; align-items: baseline; }
.event:nth-child(odd) { background: rgba(255,255,255,.022); }
.event-final { background: rgba(93,214,160,.10); }
.ev-type { color: var(--info); }
.ev-type-final { color: var(--accent); font-weight: 600; }
.ev-node { color: var(--fg-2); overflow-wrap: anywhere; }
.ev-status { color: var(--fg-3); font-size: 11px; }
.st-completed, .st-success { color: var(--accent); }
.st-pending { color: var(--warn); }
.st-running, .st-started { color: var(--info); }

.result-pane { margin-top: 14px; }
.result { padding: 12px 14px; }
.result-row { display: grid; grid-template-columns: 180px 1fr; gap: 12px; padding: 5px 0;
              border-bottom: 1px dashed var(--line); font-size: 14px; }
.result-row:last-of-type { border-bottom: 0; }
.rk { color: var(--fg-3); font-family: var(--mono); font-size: 12.5px; }
.rv { color: var(--fg); }
@media (max-width: 620px) { .result-row { grid-template-columns: 1fr; gap: 2px; } }
.result-caveat { margin: 12px 0 0; font-size: 13.5px; color: var(--warn); border-left: 2px solid var(--warn); padding-left: 10px; }
.result-sim { margin: 10px 0 0; font-size: 12.5px; color: var(--fg-3); font-family: var(--mono); }

/* chat */
.chat { border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-2); overflow: hidden; max-width: 740px; }
.chat-log { padding: 16px; min-height: 190px; max-height: 380px; overflow-y: auto; display: flex; flex-direction: column; gap: 9px; }
.bubble { padding: 9px 14px; border-radius: 14px; max-width: 82%; font-size: 14.5px; }
.bubble.bot { background: var(--bg-3); border: 1px solid var(--line); align-self: flex-start; border-bottom-left-radius: 4px; }
.bubble.me { background: var(--accent); color: #04140d; align-self: flex-end; border-bottom-right-radius: 4px; }
.bubble.error { border-color: var(--err); color: var(--err); }
.bubble.pending { opacity: .72; font-style: italic; }
.chat-input { display: flex; gap: 8px; padding: 12px; border-top: 1px solid var(--line); background: var(--bg-3); }
.chat-input input, .chat-input select {
  flex: 1; padding: 10px 13px; border-radius: 8px; border: 1px solid var(--line-2);
  background: var(--bg); color: var(--fg); font: inherit; font-size: 14.5px; min-width: 0;
}
.chat-input input:focus, .chat-input select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.chat-foot { margin: 0; padding: 9px 13px; font-size: 12.5px; color: var(--fg-3); border-top: 1px solid var(--line); }
.linklike { background: none; border: 0; color: var(--accent); cursor: pointer; font: inherit; font-size: 12.5px; padding: 0; text-decoration: underline; }

/* feedback */
.feedback-form { max-width: 740px; }
.feedback-form textarea, .feedback-form input {
  width: 100%; padding: 11px 13px; border-radius: 8px; border: 1px solid var(--line-2);
  background: var(--bg-2); color: var(--fg); font: inherit; font-size: 14.5px; resize: vertical;
}
.feedback-form textarea:focus, .feedback-form input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.feedback-row { display: flex; gap: 10px; margin-top: 10px; flex-wrap: wrap; }
.feedback-row input { flex: 1; min-width: 220px; }
.form-status { font-size: 13.5px; margin: 10px 0 0; min-height: 1.2em; color: var(--fg-3); }
.form-status.ok { color: var(--accent); }
.form-status.err { color: var(--err); }

/* cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 13px; }
.card { display: flex; flex-direction: column; gap: 5px; padding: 17px; border: 1px solid var(--line);
        border-radius: var(--radius); background: var(--bg-2); transition: border-color .15s, transform .15s; }
.card:hover { border-color: var(--accent); text-decoration: none; transform: translateY(-2px); }
.card-k { font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: .09em; color: var(--fg-3); }
.card-t { font-weight: 640; color: var(--fg); font-size: 15.5px; }
.card-d { color: var(--fg-2); font-size: 13.5px; }

/* footer */
.foot { border-top: 1px solid var(--line); padding: 26px 0 40px; background: var(--bg-2); }
.foot-inner p { margin: 0 0 7px; font-size: 13.5px; color: var(--fg-2); }
.foot-links a { color: var(--fg-2); }

/* ── featured + external domain tiles ── */
.domain-tab-featured { border-color: var(--accent-2); }
.domain-tab-featured::after {
  content: "A2A"; margin-left: 8px; font-family: var(--mono); font-size: 9.5px;
  letter-spacing: .09em; padding: 2px 6px; border-radius: 999px;
  background: rgba(93,214,160,.16); color: var(--accent); vertical-align: 1px;
}
.domain-tab-featured.active::after { background: rgba(0,0,0,.18); color: #04140d; }
.domain-tab-ext { display: inline-flex; align-items: center; gap: 7px; text-decoration: none;
                  border-style: dashed; color: var(--fg-2); }
.domain-tab-ext:hover { text-decoration: none; color: var(--accent); border-color: var(--accent); }
.ext-mark { font-size: 12px; opacity: .8; }

/* ── agent cards ── */
.agents-pane { margin-bottom: 14px; }
.agents { display: grid; grid-template-columns: repeat(auto-fit, minmax(212px, 1fr)); gap: 10px; padding: 13px; }
.agent-card { border: 1px solid var(--line); border-radius: 8px; padding: 11px 12px; background: var(--bg-3); }
.ac-top { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; margin-bottom: 5px; }
.ac-name { font-family: var(--mono); font-size: 12.5px; color: var(--fg); font-weight: 600; }
.ac-tier { font-family: var(--mono); font-size: 10px; letter-spacing: .07em; text-transform: uppercase;
           color: var(--accent); border: 1px solid var(--accent-2); border-radius: 999px; padding: 1px 7px; white-space: nowrap; }
.ac-skill { font-size: 13px; color: var(--fg-2); margin-bottom: 3px; }
.ac-reduces { font-family: var(--mono); font-size: 11px; color: var(--fg-3); }
.mesh-rule {
  margin: 0 13px 12px; padding: 9px 12px; font-size: 13.5px; color: var(--warn);
  border-left: 2px solid var(--warn); background: rgba(224,180,74,.07); border-radius: 0 6px 6px 0;
}
.mesh-more-wrap { margin: 0 13px 13px; }
.mesh-more { font-size: 13.5px; }

/* ReAct trace lines stand apart from lifecycle events */
.st-reasoned { color: var(--warn); }
.st-acted { color: var(--accent); }
.event .ev-type { white-space: nowrap; }

/* the "demo" flag on a link card */
.card-demo {
  font-style: normal; margin-left: 7px; padding: 1px 6px; border-radius: 999px;
  background: rgba(224,180,74,.15); color: var(--warn); font-size: 9.5px; letter-spacing: .08em;
}