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

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

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

h1,
h2,
h3,
h4 {
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

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

button {
  cursor: pointer;
}

a {
  color: var(--accent-ink);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

code,
kbd,
samp {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection {
  background: rgba(0, 113, 227, 0.18);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 1000;
  transform: translateY(-160%);
  background: var(--surface);
  color: var(--ink);
  padding: 10px 16px;
  border-radius: var(--r-sm);
  box-shadow: var(--shadow-lift);
  transition: transform var(--dur-2) var(--ease-out);
}

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

[hidden] {
  display: none !important;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .skip-link {
    transition: none;
  }
}
:root[data-motion="none"] *, :root[data-motion="none"] *::before, :root[data-motion="none"] *::after { animation:none !important; transition:none !important; scroll-behavior:auto !important; }
:root[data-motion="reduced"] .study-preview *, :root[data-motion="reduced"] .stage-live i { animation:none !important; }
@media(prefers-reduced-transparency:reduce) { .site-header,.overlay-backdrop { backdrop-filter:none; -webkit-backdrop-filter:none; } }
:root[data-motion="reduced"] .brand-glyph i,
:root[data-motion="reduced"] .sk-block,
:root[data-motion="reduced"] .pr-spinner { animation:none !important; }
:root[data-motion="reduced"] .duration-card.is-playing .duration-dot { animation-duration:140ms; }
:root[data-motion="none"] .duration-card.is-playing .duration-dot { transform:translateX(var(--duration-travel,0px)); }