:root {
  --bg: #ffffff;
  --text: #0b0b0e;
  --muted: #5b5b66;
  --card: #f5f6f8;
  --line: #e6e7eb;
  --accent: #0b5cff;
  --accent-ink: #ffffff;
  --shadow: 0 6px 24px rgba(0,0,0,0.08);
}

:root.dark {
  --bg: #0d0f13;
  --text: #e8e9ee;
  --muted: #a4a9b6;
  --card: #141820;
  --line: #232838;
  --accent: #4c8dff;
  --accent-ink: #0b0b0e;
  --shadow: 0 8px 28px rgba(0,0,0,0.4);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: "Noto Sans", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }

.site-header {
  position: sticky; top: 0; z-index: 50;
  display: grid; grid-template-columns: 1fr auto 1fr;
  align-items: center; gap: 1rem;
  padding: 0.75rem 1rem; background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(8px); border-bottom: 1px solid var(--line);
}

.brand { font-family: "Space Mono", monospace; font-weight: 700; text-decoration: none; color: var(--text); }
.nav { justify-self: center; }
.nav-menu { display: flex; gap: 1rem; list-style: none; margin: 0; padding: 0; }
.nav-menu a { text-decoration: none; color: var(--text); padding: .5rem .75rem; border-radius: .5rem; }
.nav-menu a:hover { background: var(--card); }
.nav-toggle { display: none; background: transparent; border: 1px solid var(--line); padding: .5rem; border-radius: .5rem; }
.actions { justify-self: end; display: flex; align-items: center; gap: .5rem; }
.icon-btn { background: transparent; border: 1px solid var(--line); padding: .5rem; border-radius: .5rem; color: var(--text); cursor: pointer; }
.icon-btn:hover { background: var(--card); }

.search { display: flex; align-items: center; gap: .35rem; border: 1px solid var(--line); padding: .25rem .5rem; border-radius: .5rem; }
.search input { border: none; outline: none; background: transparent; color: var(--text); min-width: 12ch; }

.hero { padding: 6rem 1rem 3rem; border-bottom: 1px solid var(--line); }
.hero-inner { max-width: 1100px; margin: 0 auto; text-align: center; }
.hero h1 { font-size: clamp(2rem, 3vw + 1rem, 3.2rem); margin: 0 0 .5rem; letter-spacing: -0.02em; }
.hero p { margin: 0 auto 1.25rem; max-width: 65ch; color: var(--muted); }
.hero-cta { display: inline-flex; gap: .75rem; }

.section { padding: 3rem 1rem; }
.section-header { max-width: 1100px; margin: 0 auto 1.5rem; }
.section-header h2 { margin: 0 0 .25rem; font-size: clamp(1.4rem, 1.2vw + 1rem, 2rem); }
.section-header p { margin: 0; color: var(--muted); }

.grid { max-width: 1100px; margin: 0 auto; display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
@media (max-width: 960px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) {
  .grid { grid-template-columns: 1fr; }
  .nav-toggle { display: inline-flex; }
  .nav-menu { display: none; position: absolute; top: 100%; left: 0; right: 0; background: var(--bg); border-bottom: 1px solid var(--line); padding: .5rem; }
  .nav-menu.open { display: flex; flex-direction: column; }
}

.card { background: var(--card); border: 1px solid var(--line); border-radius: .8rem; box-shadow: var(--shadow); overflow: clip; }
.card-header { padding: 1rem; border-bottom: 1px solid var(--line); }
.card-body { padding: 1rem; }
details summary { cursor: pointer; color: var(--text); padding: .25rem 0; }
details ul { margin: .5rem 0 0 1rem; padding: 0; }
details li { margin: .25rem 0; }

.btn { display: inline-flex; align-items: center; gap: .5rem; padding: .6rem .9rem; border-radius: .6rem; border: 1px solid var(--line); color: var(--text); text-decoration: none; cursor: pointer; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.small { padding: .4rem .6rem; font-size: .9rem; }
.btn:hover { filter: brightness(0.98); transform: translateY(-1px); transition: transform .15s ease; }

.labs .lab { max-width: 1100px; margin: 0.75rem auto 2rem; background: var(--card); border: 1px solid var(--line); border-radius: .8rem; box-shadow: var(--shadow); overflow: clip; }
.lab-header { padding: 1rem; border-bottom: 1px solid var(--line); }
.lab-content { display: grid; grid-template-columns: 320px 1fr; gap: 1rem; padding: 1rem; }
@media (max-width: 860px) { .lab-content { grid-template-columns: 1fr; } }
.controls { display: grid; gap: .75rem; align-content: start; }
.controls label { display: grid; gap: .25rem; font-size: .95rem; }
.controls input[type="range"] { width: 100%; }
.readouts { display: flex; gap: 1rem; align-items: baseline; color: var(--muted); }

canvas { width: 100%; height: auto; background: linear-gradient(180deg, color-mix(in srgb, var(--bg) 96%, transparent), color-mix(in srgb, var(--bg) 92%, transparent)); border: 1px dashed var(--line); border-radius: .5rem; }

.links { list-style: none; padding: 0; margin: .5rem 0 0; display: flex; flex-wrap: wrap; gap: .75rem; }
.links a { border-bottom: 1px dashed var(--line); text-decoration: none; color: var(--text); }
.links a:hover { color: var(--accent); border-color: var(--accent); }

.site-footer { padding: 2rem 1rem; border-top: 1px solid var(--line); color: var(--muted); text-align: center; }

/* micro animações */
.card:hover { transform: translateY(-2px); transition: transform .18s ease; }