:root {
  color-scheme: light;
  --plane: #eef1f4; --surface: #fcfcfb; --ink: #0b0b0b; --ink-2: #52514e; --muted: #898781;
  --hair: #e1e0d9; --axis: #c3c2b7; --ring: rgba(11, 11, 11, 0.10);
  --accent: #3f5f8f; --accent-wash: rgba(63, 95, 143, 0.10);
  --series-1: #2a78d6; --series-2: #eb6834; --good-ink: #006300;
  --display: "Chakra Petch", "Segoe UI", system-ui, sans-serif;
  --body: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark; --plane: #0d0d0d; --surface: #1a1a19; --ink: #ffffff; --ink-2: #c3c2b7;
    --hair: #2c2c2a; --axis: #383835; --ring: rgba(255, 255, 255, 0.10); --accent: #8aa6d6;
    --accent-wash: rgba(138, 166, 214, 0.12); --series-1: #3987e5; --series-2: #d95926; --good-ink: #0ca30c;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark; --plane: #0d0d0d; --surface: #1a1a19; --ink: #ffffff; --ink-2: #c3c2b7;
  --hair: #2c2c2a; --axis: #383835; --ring: rgba(255, 255, 255, 0.10); --accent: #8aa6d6;
  --accent-wash: rgba(138, 166, 214, 0.12); --series-1: #3987e5; --series-2: #d95926; --good-ink: #0ca30c;
}
* { box-sizing: border-box; }
html { background: var(--plane); scroll-behavior: smooth; }
body { margin: 0; background: var(--plane); color: var(--ink); font: 17px/1.65 var(--body); -webkit-font-smoothing: antialiased; }
.col { max-width: 760px; margin: 0 auto; padding-left: 22px; padding-right: 22px; }
.wide { max-width: 1060px; margin: 0 auto; padding-left: 22px; padding-right: 22px; }
p { margin: 0 0 16px; }
a { color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
.mono { font-family: var(--mono); font-size: 0.86em; }
h1, h2, h3 { font-family: var(--display); letter-spacing: 0.02em; line-height: 1.1; margin: 0 0 14px; }
h2 { font-size: clamp(26px, 3.6vw, 36px); text-transform: uppercase; margin-top: 10px; }
h3 { font-size: 18px; letter-spacing: 0.03em; }
section { padding: 44px 0 10px; }
.eyebrow { font: 600 13px/1 var(--display); letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-2); }
.cap, figcaption { font-size: 14px; color: var(--ink-2); line-height: 1.5; }
.center { text-align: center; }

/* topo */
.top { display: flex; justify-content: space-between; align-items: center; padding-top: 22px; gap: 12px; flex-wrap: wrap; }
.brand { font: 600 15px var(--display); letter-spacing: 0.14em; color: var(--ink); text-decoration: none; }
.brand span { color: var(--accent); }
nav { display: flex; gap: 6px 18px; align-items: center; flex-wrap: wrap; }
nav a { font: 500 14px var(--body); color: var(--ink-2); text-decoration: none; }
nav a:hover { color: var(--ink); }
.btn { color: var(--ink-2) !important; background: transparent; border: 0; box-shadow: 0 0 0 1px var(--ring); border-radius: 999px; padding: 7px 14px; }

/* abertura */
.hero { padding-top: 54px; padding-bottom: 10px; }
.hero h1 { font: 600 clamp(40px, 7vw, 76px)/1.02 var(--display); letter-spacing: 0.01em; margin: 14px 0 22px; text-transform: uppercase; }
.lead { font-size: 21px; line-height: 1.55; color: var(--ink); max-width: 680px; }
.trace-hero { margin: 34px 0 6px; }
.trace-hero .trace { display: block; width: 100%; height: 190px; }
.trace-hero .cap { margin-top: 10px; }

/* blocos */
.tiles { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin: 34px 0 10px; }
@media (max-width: 760px) { .tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.tile { background: var(--surface); border-radius: 14px; box-shadow: 0 0 0 1px var(--ring); padding: 16px 16px 14px; }
.tile .v { font: 600 34px/1 var(--display); color: var(--ink); }
.tile .k { font-size: 13px; color: var(--ink-2); margin-top: 8px; line-height: 1.4; }
.analogia { background: var(--accent-wash); border-radius: 12px; padding: 14px 18px; margin: 18px 0; }
.analogia b { font: 600 12px/1 var(--display); letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); display: block; margin-bottom: 6px; }
.nota { font-size: 14px; color: var(--ink-2); border-top: 1px solid var(--hair); border-bottom: 1px solid var(--hair); padding: 12px 0; margin: 20px 0; }
.flow { display: flex; gap: 10px; align-items: stretch; margin: 24px 0 10px; }
.flow .box { flex: 1; background: var(--surface); box-shadow: 0 0 0 1px var(--ring); border-radius: 12px; padding: 14px 14px; font-size: 14px; line-height: 1.45; }
.flow .box b { display: block; font: 600 13px var(--display); letter-spacing: 0.04em; margin-bottom: 6px; color: var(--accent); }
.flow .arrow { align-self: center; color: var(--muted); font-size: 22px; }
@media (max-width: 820px) { .flow { flex-direction: column; } .flow .arrow { transform: rotate(90deg); align-self: center; } }
figure { margin: 22px 0 26px; }
figure img { width: 100%; display: block; border-radius: 12px; box-shadow: 0 0 0 1px var(--ring); background: #fcfcfb; }
figcaption { margin-top: 8px; }
.cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 20px; }
@media (max-width: 700px) { .cards { grid-template-columns: 1fr; } }
.card { background: var(--surface); border-radius: 14px; box-shadow: 0 0 0 1px var(--ring); padding: 18px 20px 10px; }
.card h3 { margin-top: 0; }
.card p { font-size: 15px; color: var(--ink-2); }
.timeline { list-style: none; padding: 0; margin: 10px 0 20px; }
.timeline li { position: relative; padding: 10px 0 10px 26px; border-left: 2px solid var(--hair); }
.timeline li::before { content: ""; position: absolute; left: -7px; top: 18px; width: 12px; height: 12px; border-radius: 50%; background: var(--accent); }
.timeline .when { display: block; font: 600 12px/1 var(--display); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-2); margin-bottom: 6px; }
table { border-collapse: collapse; width: 100%; font-size: 15px; margin: 14px 0 22px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--hair); vertical-align: top; }
th { font: 600 12px var(--display); letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-2); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
.net { display: flex; flex-direction: column; gap: 6px; margin: 18px 0; }
.net .layer { display: grid; grid-template-columns: 150px 1fr 110px; gap: 12px; align-items: center; background: var(--surface); box-shadow: 0 0 0 1px var(--ring); border-radius: 10px; padding: 9px 14px; font-size: 14.5px; }
.net .layer .name { font: 600 13px var(--display); letter-spacing: 0.04em; color: var(--accent); }
.net .layer .shape { font-family: var(--mono); font-size: 13px; color: var(--ink-2); text-align: right; }
@media (max-width: 620px) { .net .layer { grid-template-columns: 1fr; gap: 2px; } .net .layer .shape { text-align: left; } }
.foot { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding: 40px 22px 30px; font-size: 14px; color: var(--ink-2); border-top: 1px solid var(--hair); margin-top: 40px; }
.foot a { color: var(--ink-2); }