:root {
  --bg: #f7f7fb; --panel: #ffffff; --ink: #1a1c22; --muted: #5b6070;
  --line: #e4e6ee; --brand: #6d5cf0; --brand-ink: #ffffff;
  --ok: #1f9d55; --warn: #c77700; --err: #d64545; --shadow: 0 1px 3px rgba(20,22,40,.08);
  --radius: 12px; --maxw: 1040px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14151b; --panel: #1c1e27; --ink: #e9eaf0; --muted: #a0a5b8;
    --line: #2a2d3a; --brand: #8b7cff; --shadow: 0 1px 3px rgba(0,0,0,.4);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* nav */
nav {
  position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px); border-bottom: 1px solid var(--line);
}
nav .wrap { display: flex; align-items: center; gap: 20px; height: 60px; }
nav .brand { font-weight: 800; font-size: 18px; letter-spacing: -.02em; }
nav .brand span { color: var(--brand); }
nav .links { margin-left: auto; display: flex; gap: 18px; align-items: center; }
nav .links a { color: var(--muted); font-weight: 600; font-size: 15px; }
nav .links a:hover { color: var(--ink); text-decoration: none; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px; cursor: pointer;
  border: 1px solid var(--line); background: var(--panel); color: var(--ink);
  padding: 10px 16px; border-radius: 10px; font-weight: 650; font-size: 15px;
}
.btn:hover { border-color: var(--brand); text-decoration: none; }
.btn.primary { background: var(--brand); color: var(--brand-ink); border-color: var(--brand); }
.btn.primary:hover { filter: brightness(1.06); }
.btn.big { padding: 13px 22px; font-size: 16px; }

/* hero */
.hero { padding: 72px 0 40px; text-align: center; }
.hero h1 { font-size: clamp(32px, 5vw, 52px); line-height: 1.08; letter-spacing: -.03em; margin: 0 0 16px; }
.hero .lead { font-size: clamp(17px, 2.4vw, 21px); color: var(--muted); max-width: 660px; margin: 0 auto 28px; }
.hero .cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.kicker { display:inline-block; font-weight:700; font-size:13px; letter-spacing:.08em; text-transform:uppercase;
  color: var(--brand); background: color-mix(in srgb, var(--brand) 12%, transparent);
  padding: 5px 12px; border-radius: 999px; margin-bottom: 18px; }

/* sections */
section { padding: 44px 0; }
section h2 { font-size: clamp(24px, 3.4vw, 34px); letter-spacing: -.02em; margin: 0 0 8px; }
section .sub { color: var(--muted); margin: 0 0 28px; font-size: 17px; }
.center { text-align: center; }

/* cards / steps */
.grid { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow); }
.card .n { width: 34px; height: 34px; border-radius: 9px; display: grid; place-items: center;
  font-weight: 800; background: color-mix(in srgb, var(--brand) 14%, transparent); color: var(--brand); margin-bottom: 12px; }
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); }

/* chat mock */
.mock { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 16px; max-width: 460px; margin: 28px auto 0; text-align: left; }
.bubble { background: color-mix(in srgb, var(--brand) 8%, var(--panel)); border: 1px solid var(--line);
  border-radius: 12px; padding: 10px 13px; margin: 8px 0; font-size: 14.5px; }
.bubble .who { font-weight: 700; color: var(--brand); font-size: 12px; text-transform: uppercase; letter-spacing:.04em; }
.chips { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 4px; }
.chip { border: 1px solid var(--line); border-radius: 8px; padding: 6px 10px; font-size: 13px; font-weight: 600; }

/* tool */
.tool { display: grid; gap: 20px; grid-template-columns: 1fr; }
@media (min-width: 900px) { .tool { grid-template-columns: 1fr 1fr; } }
textarea, .code {
  width: 100%; font: 13px/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: var(--panel); color: var(--ink); border: 1px solid var(--line);
  border-radius: 10px; padding: 12px; resize: vertical;
}
textarea { min-height: 300px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.report { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 14px;
  white-space: pre-wrap; font: 13.5px/1.55 ui-monospace, Menlo, Consolas, monospace; }
.status { font-weight: 700; padding: 8px 12px; border-radius: 8px; display: inline-block; }
.status.ok { color: var(--ok); background: color-mix(in srgb, var(--ok) 12%, transparent); }
.status.err { color: var(--err); background: color-mix(in srgb, var(--err) 12%, transparent); }
.status.warn { color: var(--warn); background: color-mix(in srgb, var(--warn) 12%, transparent); }
.muted { color: var(--muted); }
details { border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px; background: var(--panel); }
details summary { cursor: pointer; font-weight: 650; }
svg.map { width: 100%; height: auto; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; }
.hidden { display: none; }
footer { border-top: 1px solid var(--line); color: var(--muted); padding: 30px 0; font-size: 14px; margin-top: 40px; }
.spinner { display:inline-block; width:14px; height:14px; border:2px solid var(--line);
  border-top-color: var(--brand); border-radius:50%; animation: spin .7s linear infinite; vertical-align:-2px; }
@keyframes spin { to { transform: rotate(360deg); } }
ol.steps { padding-left: 0; list-style: none; counter-reset: s; display: grid; gap: 14px; }
ol.steps li { counter-increment: s; background: var(--panel); border: 1px solid var(--line);
  border-radius: 10px; padding: 16px 18px 16px 56px; position: relative; }
ol.steps li::before { content: counter(s); position: absolute; left: 16px; top: 16px; width: 26px; height: 26px;
  border-radius: 7px; background: var(--brand); color: #fff; display: grid; place-items: center; font-weight: 800; }
code.inline { background: color-mix(in srgb, var(--brand) 10%, transparent); padding: 1px 6px; border-radius: 5px;
  font: 13px ui-monospace, Menlo, Consolas, monospace; }
.statline { color: var(--muted); font-size: 14px; margin: 4px 0 14px; }
.tag { display: inline-block; font-size: 11px; font-weight: 700; letter-spacing: .02em; padding: 2px 7px;
  border-radius: 999px; background: color-mix(in srgb, var(--brand) 13%, transparent); color: var(--brand);
  vertical-align: 1px; }
.tag.mv { background: color-mix(in srgb, var(--warn) 15%, transparent); color: var(--warn); }
ul.abil { list-style: none; padding: 0; margin: 4px 0 6px; display: grid; gap: 8px; }
ul.abil li { padding-left: 2px; font-size: 14.5px; }
ul.abil.tree li { padding-left: 16px; position: relative; color: var(--ink); }
ul.abil.tree li::before { content: "↳"; position: absolute; left: 0; color: var(--brand); font-weight: 700; }
h4.sub2 { margin: 14px 0 6px; font-size: 14px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }