/* ============================================================
   DStudio — Base: reset, typography, primitives, motion
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  /* Lenis берёт скролл на себя; native smooth оставлен как fallback */
}
html.lenis, html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }

body {
  font-family: var(--font-sans);
  font-size: var(--t-body);
  line-height: var(--lh-body);
  letter-spacing: var(--ls-body);
  color: var(--text-on-dark);
  background: var(--ink-1000);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  font-feature-settings: 'ss01' 1, 'cv01' 1;
}

img, svg, video, canvas { display: block; max-width: 100%; height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; padding: 0; }

::selection { background: var(--volt-500); color: #fff; }

:focus-visible {
  outline: 2px solid var(--volt-400);
  outline-offset: 3px;
  border-radius: var(--r-xs);
}

/* ---------- Зернистость: убирает «пластиковость» больших заливок ---------- */
.grain::after {
  content: '';
  position: absolute; inset: 0;
  pointer-events: none;
  opacity: .5;
  mix-blend-mode: overlay;
  background-image: var(--grain-url);
  background-size: 180px 180px;
  z-index: 1;
}

/* ============================================================
   Layout primitives
   ============================================================ */

.section {
  position: relative;
  padding-block: var(--section-y);
  background: var(--bg);
  color: var(--fg);
  transition: background-color var(--d-slow) var(--ease-in-out),
              color var(--d-slow) var(--ease-in-out);
}

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
  position: relative;
  z-index: 2;
}
.wrap--wide { max-width: 1600px; }
.wrap--narrow { max-width: 900px; }

.grid { display: grid; gap: var(--s-5); }
.grid-2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0,1fr)); }
.grid-12 { grid-template-columns: repeat(12, minmax(0,1fr)); }

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0,1fr)); }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.stack > * + * { margin-top: var(--s-4); }
.flow > * + * { margin-top: var(--s-5); }

/* ============================================================
   Typography
   ============================================================ */

.display, h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: var(--lh-snug);
  letter-spacing: var(--ls-head);
  text-wrap: balance;
}

.t-hero {
  font-size: var(--t-hero);
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-hero);
  font-weight: 700;
}
.t-h1 { font-size: var(--t-h1); line-height: var(--lh-tight); letter-spacing: var(--ls-hero); }
.t-h2 { font-size: var(--t-h2); }
.t-h3 { font-size: var(--t-h3); }
.t-h4 { font-size: var(--t-h4); font-family: var(--font-sans); font-weight: 600; letter-spacing: -.015em; }

.lead {
  font-size: var(--t-lead);
  line-height: 1.5;
  color: var(--fg-muted);
  max-width: 56ch;
  text-wrap: pretty;
}

.muted { color: var(--fg-muted); }
.faint { color: var(--fg-faint); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--s-3);
  font-size: var(--t-micro);
  font-weight: 600;
  letter-spacing: var(--ls-eyebrow);
  text-transform: uppercase;
  color: var(--accent-soft);
  font-family: var(--font-sans);
}
.eyebrow::before {
  content: '';
  width: 28px; height: 1px;
  background: currentColor;
  opacity: .6;
}

.mono {
  font-family: var(--font-mono);
  font-size: var(--t-micro);
  letter-spacing: .02em;
}

/* Градиентная подсветка ключевого слова — используется точечно */
.gleam {
  background: linear-gradient(100deg, var(--volt-400) 0%, var(--volt-500) 40%, var(--amber-400) 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ============================================================
   Buttons
   ============================================================ */

.btn {
  --btn-bg: var(--volt-500);
  --btn-fg: #fff;
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-3);
  padding: .95em 1.75em;
  border-radius: var(--r-pill);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: var(--t-body);
  letter-spacing: -.01em;
  color: var(--btn-fg);
  background: var(--btn-bg);
  isolation: isolate;
  overflow: hidden;
  white-space: nowrap;
  transition: transform var(--d-base) var(--ease-spring),
              box-shadow var(--d-base) var(--ease-out),
              color var(--d-base) var(--ease-out);
  will-change: transform;
}

/* Заливка, растекающаяся от точки наведения */
.btn::before {
  content: '';
  position: absolute;
  left: var(--mx, 50%); top: var(--my, 50%);
  width: 0; height: 0;
  border-radius: 50%;
  background: var(--btn-hover-bg, #fff);
  transform: translate(-50%, -50%);
  transition: width var(--d-slow) var(--ease-out), height var(--d-slow) var(--ease-out);
  z-index: -1;
}
.btn:hover::before { width: 280%; height: 280%; }
.btn:hover { transform: translateY(-2px); box-shadow: var(--glow-volt); }
.btn:active { transform: translateY(0) scale(.985); }

.btn--primary { --btn-bg: var(--volt-500); --btn-fg: #fff; --btn-hover-bg: var(--volt-400); }
.btn--light   { --btn-bg: var(--paper-0); --btn-fg: var(--ink-1000); --btn-hover-bg: var(--amber-400); }
.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--fg);
  --btn-hover-bg: var(--glass);
  box-shadow: inset 0 0 0 1px var(--hairline);
}
.btn--ghost:hover { box-shadow: inset 0 0 0 1px var(--accent-soft); }

.btn__icon { transition: transform var(--d-base) var(--ease-spring); }
.btn:hover .btn__icon { transform: translateX(4px); }

/* ============================================================
   Cards & surfaces
   ============================================================ */

.card {
  position: relative;
  padding: var(--s-6);
  border-radius: var(--r-lg);
  background: var(--bg-raised);
  box-shadow: inset 0 0 0 1px var(--hairline);
  overflow: hidden;
  transition: transform var(--d-base) var(--ease-out),
              box-shadow var(--d-base) var(--ease-out);
}

/* Мягкий световой блик, следующий за курсором */
.card--lit::after {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(320px circle at var(--mx, 50%) var(--my, 50%),
              rgba(107,107,255,.14), transparent 62%);
  opacity: 0;
  transition: opacity var(--d-base) var(--ease-out);
  pointer-events: none;
}
.card--lit:hover::after { opacity: 1; }
.card--lit:hover { transform: translateY(-4px); box-shadow: inset 0 0 0 1px var(--accent-soft), var(--shadow-lg); }

.hairline { border-top: 1px solid var(--hairline); }

/* ============================================================
   Reveal system — единая физика появления
   ============================================================ */

html.js [data-reveal] {
  opacity: 0;
  transform: translate3d(0, 28px, 0);
  transition: opacity var(--d-reveal) var(--ease-out),
              transform var(--d-reveal) var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}
html.js [data-reveal].is-in { opacity: 1; transform: none; }

html.js [data-reveal='scale']  { transform: translate3d(0, 40px, 0) scale(.96); }
html.js [data-reveal='left']   { transform: translate3d(-36px, 0, 0); }
html.js [data-reveal='right']  { transform: translate3d(36px, 0, 0); }
html.js [data-reveal='clip']   { opacity: 1; clip-path: inset(0 0 100% 0); transform: none; }
html.js [data-reveal='clip'].is-in { clip-path: inset(0 0 0 0); }

/* Режим визуальной проверки: всё видно сразу */
html.no-reveal [data-reveal],
html.no-reveal .line-mask > span { opacity: 1 !important; transform: none !important; clip-path: none !important; }

/* Построчное появление заголовков */
.line-mask { display: block; overflow: hidden; }
.line-mask > span {
  display: block;
  transform: translate3d(0, 105%, 0);
  transition: transform 1.05s var(--ease-out);
  transition-delay: var(--line-delay, 0ms);
}
.is-in .line-mask > span, .line-mask.is-in > span { transform: none; }

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1 !important; transform: none !important; clip-path: none !important; }
  .line-mask > span { transform: none !important; }
}

/* ============================================================
   Utilities
   ============================================================ */

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

.center { text-align: center; }
.center .lead { margin-inline: auto; }
.relative { position: relative; }
.overflow-hidden { overflow: hidden; }

/* Скип-ссылка: видна только при переходе с клавиатуры */
.skip {
  position: absolute; left: 50%; top: 0; z-index: 2000;
  transform: translate(-50%, -120%);
  padding: .7em 1.4em;
  border-radius: 0 0 var(--r-md) var(--r-md);
  background: var(--volt-500); color: #fff;
  font-weight: 600; font-size: .9rem;
  transition: transform var(--d-base) var(--ease-out);
}
.skip:focus { transform: translate(-50%, 0); }