.hero { position: relative; height: var(--hero-scroll-h); background: var(--c-black); }
.hero__sticky { position: sticky; top: 0; height: 100vh; width: 100%; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.hero__dot-grid {
  position: absolute; inset: -10%;
  background-image: radial-gradient(circle, var(--hero-dot-color) var(--hero-dot-size), transparent var(--hero-dot-size));
  background-size: var(--hero-dot-gap) var(--hero-dot-gap);
  will-change: opacity, transform; pointer-events: none; transform: scale(1);
}
.hero__vignette {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 70% 60% at 50% 50%, transparent 0%, rgba(10,10,10,0.4) 70%, rgba(10,10,10,0.85) 100%);
  pointer-events: none; z-index: 1; will-change: opacity;
}
.hero__border-glow { position: absolute; inset: 12px; pointer-events: none; will-change: opacity; border-radius: 2px; }
.hero__border-glow::before { content: ''; position: absolute; inset: 0; border-radius: 2px; border: 1px solid rgba(138,141,147,0.2); }
.hero__border-glow::after { content: ''; position: absolute; inset: -2px; border-radius: 4px; border: 1px solid rgba(138,141,147,0.06); filter: blur(6px); }
.hero__border-sweep { position: absolute; inset: 0; border-radius: 2px; overflow: hidden; }
.hero__border-sweep::before {
  content: ''; position: absolute; top: -1px; left: -100%; width: 60%; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(200,204,208,0.5), rgba(200,204,208,0.8), rgba(200,204,208,0.5), transparent);
  animation: border-sweep-h 4s ease-in-out infinite;
}
.hero__border-sweep::after {
  content: ''; position: absolute; top: -100%; right: -1px; width: 1px; height: 60%;
  background: linear-gradient(180deg, transparent, rgba(200,204,208,0.4), rgba(200,204,208,0.7), rgba(200,204,208,0.4), transparent);
  animation: border-sweep-v 4s ease-in-out 2s infinite;
}
@keyframes border-sweep-h { 0% { left: -60%; } 100% { left: 100%; } }
@keyframes border-sweep-v { 0% { top: -60%; } 100% { top: 100%; } }
.hero__logo-layer {
  position: absolute; display: flex; flex-direction: column; align-items: center; gap: 16px;
  will-change: opacity, transform; z-index: 2; transform: scale(1) translateY(0);
}
.hero__logo-svg { height: clamp(36px, 5vw, 56px); width: auto; filter: brightness(0) invert(1); }
.hero__tagline { font-family: var(--font-en); font-size: clamp(13px, 1.4vw, 16px); font-weight: var(--fw-light); letter-spacing: 0.12em; color: var(--c-steel); }
.hero__text-layer {
  position: absolute; display: flex; flex-direction: column; align-items: center;
  gap: clamp(20px, 3vh, 36px); text-align: center; padding: 0 clamp(20px, 4vw, 60px); z-index: 2;
}
.hero__line {
  font-size: clamp(20px, 2.8vw, 30px); font-weight: var(--fw-light); line-height: 1.6;
  color: var(--c-text-on-dark); opacity: 0; will-change: opacity, transform, filter;
  transform: translateY(20px); filter: blur(4px);
}
.hero__line[data-line="1"] { font-size: clamp(16px, 2.2vw, 24px); color: var(--c-steel-bright); }
.hero__line[data-line="3"] { font-weight: var(--fw-regular); }
.hero__scroll-hint {
  position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%);
  color: var(--c-steel); opacity: 0.5; animation: hero-bounce 2.5s ease-in-out infinite;
  z-index: 3; pointer-events: none; will-change: opacity; transition: opacity 0.4s ease;
}
@keyframes hero-bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); opacity: 0.5; }
  50% { transform: translateX(-50%) translateY(10px); opacity: 0.3; }
}
.hero__progress {
  position: absolute; bottom: 0; left: 0; width: 100%; height: 2px;
  background: linear-gradient(90deg, var(--c-steel), var(--c-chrome), var(--c-steel-light));
  transform: scaleX(0); transform-origin: left; z-index: 3; will-change: transform;
}
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 20px clamp(20px, 4vw, 40px); display: flex; align-items: center; justify-content: space-between;
  transition: background var(--duration-fast) ease, border-color var(--duration-fast) ease;
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(10,10,10,0.88); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom-color: rgba(138,141,147,0.08);
}
.site-header__logo { display: flex; align-items: center; }
.site-header__logo-img { height: 28px; width: auto; filter: brightness(0) invert(1); transition: opacity var(--duration-fast) ease; }
.site-header__cta { font-size: 13px; padding: 10px 24px; }