*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--duration-base) ease, color var(--duration-base) ease;
}

/* Barra de rolagem fina, no tom do tema (Chromium/Firefox) */
* { scrollbar-width: thin; scrollbar-color: var(--border) transparent; }
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb { background: var(--border); border-radius: 999px; border: 2px solid transparent; background-clip: padding-box; }
*::-webkit-scrollbar-thumb:hover { background: var(--text-muted); background-clip: padding-box; }

body {
  min-height: 100vh;
  font-variant-numeric: tabular-nums;
}

h1, h2, h3, h4 { margin: 0 0 var(--space-2); line-height: 1.25; }
p { margin: 0 0 var(--space-3); }
ul { margin: 0; padding: 0; }

a { color: var(--link-text); text-decoration: none; }
a:hover { text-decoration: underline; }

button { font-family: inherit; }

img { max-width: 100%; display: block; }

:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-sm);
}

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: var(--space-2);
  z-index: 100;
  background: var(--surface);
  color: var(--text);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
}
.skip-link:focus { left: var(--space-2); }

/* Layout geral */
.app-topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  height: 64px;
  padding: 0 var(--space-4);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.app-topbar::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--navy-gradient);
}

.app-topbar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.01em;
  color: var(--accent-text);
  white-space: nowrap;
}

.app-topbar__brand svg { flex: none; border-radius: 6px; box-shadow: var(--shadow); }

.app-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-4);
}

.tab-panel { display: none; }
.tab-panel.is-active { display: block; }

@media (max-width: 1024px) {
  .app-main { padding: var(--space-3); }
}