.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.95em 1.9em;
  border-radius: var(--radius-pill);
  font-size: var(--fs--1);
  letter-spacing: 0.02em;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}

.btn--light { background: var(--color-secondary); color: var(--color-primary); }
.btn--light:hover { background: var(--color-accent); transform: translateY(-2px); }

.btn--ghost { border: 1px solid var(--color-border); color: var(--color-text); }
.btn--ghost:hover { border-color: var(--color-accent); color: var(--color-accent); }

.header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  padding-block: var(--space-m);
  transition: background-color var(--dur) var(--ease), padding var(--dur) var(--ease);
}
.header--scrolled {
  background-color: var(--color-bg-blur);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding-block: var(--space-s);
  border-bottom: 1px solid var(--color-border);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-l);
}

.logo { display: inline-flex; align-items: center; color: var(--color-secondary); }
.logo svg { width: 42px; height: auto; }
.logo svg .logo__center { fill: var(--color-accent); }

.nav { display: flex; align-items: center; gap: var(--space-l); }
.nav__list { display: flex; gap: var(--space-m); position: relative; }
.nav__link {
  position: relative;
  font-size: var(--fs--1);
  letter-spacing: 0.01em;
  color: var(--color-secondary);
  padding-block: 6px;
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 1px;
  background: var(--color-secondary);
  transition: width var(--dur) var(--ease);
}
.nav__link:hover::after { width: 100%; }

.nav__indicator {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
  transition: left 0.4s var(--ease);
  pointer-events: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  width: 42px;
  height: 42px;
}
.nav-toggle__bar {
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--dur) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:first-child { transform: translateY(4px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:last-child  { transform: translateY(-4px) rotate(-45deg); }

.hero { position: relative; height: 220vh; }

.hero__stage {
  position: sticky;
  top: 0;
  height: 100vh;
  height: var(--app-vh, 100vh);
  overflow: hidden;
}

.hero__inner {
  position: relative;
  z-index: 1;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  max-width: var(--grid-whole);
  margin-inline: auto;
  padding: calc(var(--space-3xl) + 2.5rem) var(--grid-padding) var(--space-2xl);
}
.hero__title { max-width: 13ch; color: var(--color-secondary); }
.hero__foot {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-m);
  max-width: 34ch;
}
.hero__subtitle { color: var(--color-secondary); }

.hero__media {
  position: fixed;
  z-index: 2;
  pointer-events: none;
  top: 50%; left: 50%;
  width: min(540px, 78vw);
  aspect-ratio: 16 / 10;
  transform: translate(-50%, -50%);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  display: grid;
  place-items: center;
}

.hero__video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero__media::before { content: none; }
.hero__play {
  width: 64px; height: 64px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-primary);
  font-size: 1.2rem;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.hero__play:hover { transform: scale(1.08); background: var(--color-accent-hover); }

.footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-l);
  text-align: center;
}
.footer__copy { font-size: var(--fs--1); color: var(--color-text-muted); }

@media (max-width: 880px) {
  .nav__list {
    position: fixed;
    inset: 0 0 0 auto;
    width: min(82vw, 340px);
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    gap: var(--space-m);
    padding: var(--space-2xl) var(--space-xl);
    background: var(--color-surface);
    border-left: 1px solid var(--color-border);
    transform: translateX(100%);
    transition: transform var(--dur) var(--ease);
  }

  .nav__list.is-open { transform: none; box-shadow: -24px 0 60px rgba(var(--rgb-ink), 0.18); }

  .nav__list .nav__link {
    font-family: var(--font-heading);
    font-size: var(--fs-2);
    color: var(--color-secondary);
  }
  .nav-toggle { display: flex; z-index: 110; }
  .nav__indicator { display: none; }

  .hero__inner { padding-bottom: var(--space-l); }
}