/* =============================================
   EMUI.ru — main.css
   Base reset, typography, utilities, layout
   ============================================= */

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: 'DM Sans', sans-serif;
  font-size: 1rem;
  line-height: 1.65;
  background: var(--color-bg);
  color: var(--color-text-primary);
  transition: background 0.35s ease, color 0.35s ease;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, video, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }
input, textarea { font: inherit; }
h1, h2, h3, h4, h5, h6 { font-family: 'Sora', sans-serif; line-height: 1.2; }
:focus-visible {
  outline: 2.5px solid var(--color-accent-blue);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---- Container ---- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 3rem);
}

/* ---- Section shared ---- */
section { position: relative; }

.section-header {
  text-align: center;
  max-width: 680px;
  margin-inline: auto;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.section-label {
  font-family: 'Sora', sans-serif;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: var(--gradient-logo);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.6rem;
  display: inline-block;
}

.section-title {
  font-family: 'Sora', sans-serif;
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 0.85rem;
  letter-spacing: -0.02em;
}

.section-sub {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: 'Sora', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.75rem 1.6rem;
  border-radius: 50px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
  white-space: nowrap;
  cursor: pointer;
  text-decoration: none;
  letter-spacing: 0.01em;
}

.btn-primary {
  background: var(--gradient-logo);
  color: #fff;
  box-shadow: 0 4px 18px rgba(167,139,250,0.35);
}
.btn-primary:hover {
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 8px 32px rgba(167,139,250,0.45);
}
.btn-primary:active { transform: scale(0.98); }

.btn-ghost {
  background: transparent;
  color: var(--color-text-primary);
  border: 1.5px solid var(--color-border-strong);
}
.btn-ghost:hover {
  background: var(--color-surface);
  border-color: var(--color-accent-violet);
  color: var(--color-accent-violet);
  transform: translateY(-2px) scale(1.03);
}
.btn-ghost:active { transform: scale(0.98); }

/* ---- Chip button ---- */
.chip-btn {
  display: inline-flex;
  align-items: center;
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.3rem 0.85rem;
  border-radius: 50px;
  background: var(--color-surface);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  transition: all 0.18s ease;
  cursor: pointer;
}
.chip-btn:hover {
  background: var(--color-surface-hover);
  color: var(--color-accent-blue);
  border-color: var(--color-accent-blue);
  transform: translateY(-1px);
}

/* ---- Animations (Intersection Observer reveal) ---- */
@media (prefers-reduced-motion: no-preference) {
  .reveal-item {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.6s ease, transform 0.6s ease;
    transition-delay: var(--delay, 0s);
  }
  .reveal-item.is-visible {
    opacity: 1;
    transform: none;
  }
  .reveal-card {
    opacity: 0;
    transform: translateY(32px);
    transition: opacity 0.55s ease, transform 0.55s ease;
    transition-delay: var(--delay-card, 0s);
  }
  .reveal-card.is-visible {
    opacity: 1;
    transform: none;
  }
  .reveal-timeline {
    opacity: 0;
    transform: translateX(-20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
    transition-delay: var(--t-delay, 0s);
  }
  .reveal-timeline.is-visible {
    opacity: 1;
    transform: none;
  }
}
@media (prefers-reduced-motion: reduce) {
  .reveal-item, .reveal-card, .reveal-timeline { opacity: 1 !important; transform: none !important; }
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 7px; height: 7px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--color-border-strong); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-accent-violet); }

/* ---- Selection ---- */
::selection { background: rgba(167,139,250,0.25); color: var(--color-text-primary); }

/* ---- Typography helpers ---- */
.text-gradient {
  background: var(--gradient-logo);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}