:root {
  --bg: #0b1220;
  --bg-alt: #0f1a2e;
  --card: #13203a;
  --line: #1f2f4f;
  --text: #e6ecf5;
  --muted: #9aa8bf;
  --accent: #3ea6ff;
  --accent-2: #22d3a6;
  --radius: 14px;
  --max: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .6em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.1rem); }
p { margin: 0 0 1em; color: var(--muted); }

.container { width: min(var(--max), 100% - 40px); margin-inline: auto; }
.narrow { max-width: 720px; }
.center { text-align: center; }

/* Topbar */
.topbar {
  position: sticky; top: 0; z-index: 10;
  background: rgba(11, 18, 32, .85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { font-weight: 800; font-size: 1.15rem; letter-spacing: -.02em; }
.brand span { color: var(--accent); }
.nav-links { display: flex; gap: 22px; list-style: none; margin: 0; padding: 0; align-items: center; }
.nav-links a { color: var(--muted); font-size: .95rem; transition: color .15s; }
.nav-links a:hover { color: var(--text); }
.nav-links .nav-cta { color: var(--text); border: 1px solid var(--line); padding: 6px 14px; border-radius: 999px; }

/* Hero */
.hero {
  padding: clamp(72px, 14vw, 150px) 0 clamp(64px, 10vw, 110px);
  background:
    radial-gradient(600px 300px at 15% 10%, rgba(62, 166, 255, .18), transparent 70%),
    radial-gradient(500px 260px at 85% 30%, rgba(34, 211, 166, .12), transparent 70%);
}
.eyebrow { color: var(--accent-2); font-weight: 600; letter-spacing: .08em; text-transform: uppercase; font-size: .85rem; }
.hero h1 { font-size: clamp(2.4rem, 7vw, 4.4rem); letter-spacing: -.03em; }
.lead { font-size: clamp(1.05rem, 2.2vw, 1.3rem); max-width: 640px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.btn { display: inline-block; padding: 12px 22px; border-radius: 999px; font-weight: 600; transition: transform .15s, background .15s; }
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #051021; }
.btn-ghost { border: 1px solid var(--line); }
.btn-ghost:hover { background: var(--card); }

/* Sections */
.section { padding: clamp(56px, 9vw, 96px) 0; }
.section.alt { background: var(--bg-alt); border-block: 1px solid var(--line); }

.grid { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid.two { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}
.card h3 { font-size: 1.15rem; }
.card p { margin: 0; }
.project { display: flex; flex-direction: column; gap: 6px; transition: border-color .15s, transform .15s; }
.project:hover { border-color: var(--accent); transform: translateY(-2px); }
.project p { flex: 1; }
.tag { align-self: flex-start; font-size: .75rem; font-weight: 600; color: var(--accent-2); background: rgba(34, 211, 166, .1); padding: 3px 10px; border-radius: 999px; margin-bottom: 6px; }
.link { color: var(--accent); font-weight: 600; font-size: .95rem; margin-top: 10px; }

.stack { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 28px 0 0; }
.stack li { font-size: .85rem; color: var(--muted); border: 1px solid var(--line); padding: 5px 12px; border-radius: 999px; }

/* Contato */
.contacts { list-style: none; padding: 0; margin: 28px auto 0; display: grid; gap: 12px; max-width: 420px; }
.contacts a {
  display: flex; justify-content: space-between; gap: 12px;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 18px; transition: border-color .15s;
  overflow-wrap: anywhere;
}
.contacts a:hover { border-color: var(--accent); }
.contacts span { color: var(--muted); font-size: .9rem; }

.footer { padding: 28px 0; color: var(--muted); font-size: .9rem; text-align: center; }

@media (max-width: 640px) {
  .nav-links li:not(:last-child) { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}