/* ==========================================================================
   base.css — reset, document defaults, typography, form primitives
   ========================================================================== */

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

* {
  margin: 0;
}

/* The browser's own `[hidden] { display: none }` sits at the very bottom of
   the cascade, so ANY class that sets a display — .btn, .composer__reply,
   .chips — silently beats it and the element stays on screen with `hidden`
   set. This is the one place in the stylesheet that earns an !important. */
[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-md);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--surface-page);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

img,
svg,
video,
canvas {
  display: block;
  max-width: 100%;
}

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

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: var(--leading-tight);
  letter-spacing: -0.011em;
  text-wrap: balance;
}

h1 { font-size: var(--text-xl); }
h2 { font-size: var(--text-lg); }
h3 { font-size: var(--text-md); }

p { text-wrap: pretty; }

a {
  color: var(--text-link);
  text-decoration-color: color-mix(in srgb, currentColor 35%, transparent);
  text-underline-offset: 2px;
}

a:hover { text-decoration-color: currentColor; }

small { font-size: var(--text-xs); }

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

/* Utility type roles */
.eyebrow {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-muted);
}

.text-secondary { color: var(--text-secondary); }
.text-muted     { color: var(--text-muted); }
.numeric        { font-variant-numeric: tabular-nums; }

/* --------------------------------------------------------------------------
   Focus — one visible treatment everywhere, never removed
   -------------------------------------------------------------------------- */

:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Screen-reader-only, but focusable (skip link) */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  z-index: 100;
  padding: var(--space-2) var(--space-4);
  background: var(--surface-raised);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  transform: translateY(-200%);
  transition: transform var(--duration-base) var(--ease);
}

.skip-link:focus { transform: translateY(0); }

/* --------------------------------------------------------------------------
   Scrollbars — thin and recessive
   -------------------------------------------------------------------------- */

* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}

*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border: 3px solid transparent;
  background-clip: content-box;
  border-radius: var(--radius-pill);
}
*::-webkit-scrollbar-thumb:hover { background-color: var(--text-faint); background-clip: content-box; }

/* --------------------------------------------------------------------------
   Selection
   -------------------------------------------------------------------------- */

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