/* 3B Mailbox app: reset, typography, focus, motion and forced colours. Uses tokens.css only. */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  background: var(--surface);
  scroll-padding-top: var(--space-6);
  /* Space for the phone tab bar and the bulk bar, so focus never hides under them (WCAG 2.4.11). */
  scroll-padding-bottom: 8rem;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--surface);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--text-md);
  line-height: var(--leading-normal);
  overflow-wrap: break-word;
  font-feature-settings: 'cv11', 'ss01';
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  line-height: var(--leading-tight);
  font-weight: var(--weight-bold);
  text-wrap: balance;
}

p,
ul,
ol,
dl,
figure,
blockquote,
pre {
  margin: 0;
}

ul[class],
ol[class] {
  list-style: none;
  padding: 0;
}

img,
svg {
  max-width: 100%;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
  letter-spacing: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--accent-hover);
  text-decoration-thickness: 2px;
}

code,
kbd,
pre {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

code {
  padding: 0.1em 0.35em;
  border-radius: var(--radius-sm);
  background: var(--surface-sunken);
  overflow-wrap: anywhere;
}

kbd {
  display: inline-grid;
  place-items: center;
  min-width: 2em;
  padding: 0.1em 0.5em;
  border: var(--border-width) solid var(--border-strong);
  border-bottom-width: 2px;
  border-radius: var(--radius-sm);
  background: var(--surface-raised);
  font-weight: var(--weight-bold);
}

fieldset {
  margin: 0;
  padding: 0;
  border: 0;
  min-width: 0;
}

legend {
  padding: 0;
}

/* Focus: always visible, 3px, never removed. */
:focus-visible {
  outline: var(--focus-width) solid var(--focus-ring);
  outline-offset: 2px;
}

[tabindex='-1']:focus {
  outline: none;
}

[tabindex='-1']:focus-visible {
  outline: var(--focus-width) solid var(--focus-ring);
}

h1[tabindex='-1']:focus,
h2[tabindex='-1']:focus {
  outline: none;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: fixed;
  top: var(--space-2);
  left: var(--space-2);
  z-index: 100;
  display: inline-flex;
  align-items: center;
  min-height: var(--target-min);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--surface-inverse);
  color: var(--text-inverse);
  font-weight: var(--weight-bold);
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: none;
}

.skip-link:hover {
  color: var(--text-inverse);
}

.muted {
  color: var(--text-muted);
}

.icon {
  flex: none;
  width: 1.25em;
  height: 1.25em;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  vertical-align: middle;
}

::selection {
  background: var(--accent-soft);
  color: var(--accent-soft-text);
}

/* Motion: off when the system or the user's setting asks for it. */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

:root[data-motion='reduce'] *,
:root[data-motion='reduce'] *::before,
:root[data-motion='reduce'] *::after {
  animation-duration: 0.01ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.01ms !important;
  scroll-behavior: auto !important;
}

@media (forced-colors: active) {
  :focus-visible {
    outline-color: Highlight;
  }

  .icon {
    stroke: currentColor;
  }
}