/* Shared base and components for every screen. Values come from tokens.css; guide: DESIGN-SYSTEM.md. */
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body {
  margin: 0;
  background: var(--color-page);
  color: var(--color-ink);
  font: var(--text-body)/var(--leading-body) var(--font-family);
  word-break: keep-all;
}
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: var(--color-brand-deep); }

/* Header: the same bar on home and inner screens. [back | title | menu], or [brand | menu] on home. */
.sub-top {
  position: sticky; top: 0; z-index: 5;
  display: grid; grid-template-columns: var(--tap) 1fr var(--tap); align-items: center;
  max-width: var(--page-max); height: calc(var(--header-height) + env(safe-area-inset-top));
  margin: 0 auto; padding: env(safe-area-inset-top) calc(var(--gutter) - (var(--tap) - var(--icon)) / 2) 0;
  background: var(--color-page);
}
.sub-top.home-top { grid-template-columns: 1fr var(--tap); }
.sub-title, .brand {
  margin: 0; font-size: var(--text-title-3); line-height: 1.4; font-weight: var(--weight-bold);
}
.sub-title { text-align: center; }
.brand { padding-left: calc((var(--tap) - var(--icon)) / 2); }  /* Text lines up with the page gutter. */
.back, .menu-btn {
  display: grid; place-content: center; width: var(--tap); height: var(--tap);
  padding: 0; border: 0; background: none; color: inherit; text-decoration: none;
}
.back img, .menu-btn img { display: block; width: var(--icon); height: var(--icon); }

/* Page body */
.sub { max-width: var(--page-max); margin: 0 auto; padding: var(--space-2) var(--gutter) max(var(--space-8), env(safe-area-inset-bottom)); }

/* Buttons */
.primary {
  min-height: var(--button-height); border: 0; border-radius: var(--radius-sm);
  background: var(--color-button); color: var(--color-on-dark);
  font-size: var(--text-body); font-weight: var(--weight-bold);
}
.ghost {
  min-height: var(--control-height); border: 1px solid var(--color-line); border-radius: var(--radius-sm);
  background: var(--color-soft); font-weight: var(--weight-medium);
}
.link {
  min-height: 44px; border: 0; background: none; color: var(--color-brand-deep);
  font-weight: var(--weight-medium); text-decoration: underline;
}

/* Toast: short notice at the bottom */
.toast {
  position: fixed; left: 50%; bottom: max(var(--space-8), calc(env(safe-area-inset-bottom) + var(--space-4))); z-index: 30;
  padding: var(--space-3) var(--space-5); border-radius: var(--radius-pill);
  background: var(--color-toast); color: var(--color-on-dark);
  font-size: var(--text-body-sm); font-weight: var(--weight-medium); white-space: nowrap;
  opacity: 0; transform: translate(-50%, 8px); transition: opacity var(--duration), transform var(--duration); pointer-events: none;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* Screen-reader only */
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }