/* ============================================================
   LaunchPad — база: reset, типографика, сетка, служебное
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + env(safe-area-inset-top) + 24px);
}

body {
  margin: 0;
  background-color: var(--bg);
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body.is-locked {
  overflow: hidden;
}

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

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

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

a {
  color: inherit;
  text-decoration: none;
}

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

button {
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

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

/* ---------- Скроллбар ---------- */

::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: #2C2C35;
  border: 2px solid var(--bg);
  border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
  background: #3A3A45;
}

/* ---------- Типографика ---------- */

h1, h2, h3, h4 {
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 600;
  line-height: var(--lh-tight);
  letter-spacing: var(--tr-tight);
  text-wrap: balance;
  overflow-wrap: break-word;
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); line-height: var(--lh-snug); }

p {
  text-wrap: pretty;
  overflow-wrap: break-word;
}

strong {
  color: var(--text);
  font-weight: 600;
}

/* ---------- Сетка-каркас ---------- */

.shell {
  width: 100%;
  max-width: var(--page-max);
  margin-inline: auto;
  padding-inline: max(var(--gutter), env(safe-area-inset-left)) max(var(--gutter), env(safe-area-inset-right));
}

.grid12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: clamp(1rem, 2vw, 2rem);
}

.section {
  padding-block: var(--section-y);
  position: relative;
}

.section--line {
  border-top: var(--border);
}

/* ---------- Заголовок раздела ---------- */

.head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-4);
  padding-bottom: var(--sp-6);
  border-bottom: var(--border);
}

@media (min-width: 900px) {
  .head {
    grid-template-columns: 180px minmax(0, 1fr);
    column-gap: clamp(1.5rem, 4vw, 4rem);
    align-items: start;
  }
}

.head__index {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--tr-wide);
  text-transform: uppercase;
  color: var(--text-dim);
  padding-top: 0.5em;
}

.head__title {
  max-width: 22ch;
}

.head__note {
  margin-top: var(--sp-5);
  max-width: 54ch;
  color: var(--text-muted);
}

/* ---------- Служебные надписи ---------- */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--tr-wide);
  text-transform: uppercase;
  color: var(--text-dim);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--line);
}

.eyebrow--accent {
  color: var(--accent);
}

.eyebrow--accent::before {
  background: var(--accent);
  box-shadow: var(--glow-sm);
}

.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* ---------- Доступность ---------- */

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

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -100px;
  z-index: var(--z-overlay);
  padding: 0.7rem 1.1rem;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 700;
  transition: top var(--t-fast) var(--ease);
}

.skip-link:focus {
  top: 12px;
}

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

/* ---------- Появление при скролле ---------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 600ms var(--ease-out),
    transform 600ms var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}

.reveal.is-in {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Уважаем настройки движения ---------- */

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

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}