[data-dhp-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity var(--dhp-dur-reveal, 480ms) cubic-bezier(.16, 1, .3, 1) var(--dhp-reveal-delay, 0ms),
    transform var(--dhp-dur-reveal, 480ms) cubic-bezier(.16, 1, .3, 1) var(--dhp-reveal-delay, 0ms);
  will-change: opacity, transform;
}

[data-dhp-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
  will-change: auto;
}

/* ── 큰 제목 전용 리빌: 블러→선명 + 상승 (SiteLayout 옵저버가 .is-visible 부여) ── */
[data-dhp-title] {
  opacity: 0;
  transform: translateY(0.5em);
  filter: blur(6px);
  transition:
    opacity var(--dhp-dur-reveal, 480ms) cubic-bezier(.16, 1, .3, 1) var(--dhp-reveal-delay, 0ms),
    transform 620ms cubic-bezier(.16, 1, .3, 1) var(--dhp-reveal-delay, 0ms),
    filter 620ms cubic-bezier(.16, 1, .3, 1) var(--dhp-reveal-delay, 0ms);
  will-change: opacity, transform, filter;
}
[data-dhp-title].is-visible {
  opacity: 1;
  transform: none;
  filter: blur(0);
  will-change: auto;
}

/* 강조어 그라데이션 스윕 (opt-in: 그라데이션 클립된 단어에 .dhp-sweep) */
[data-dhp-title] .dhp-sweep { background-size: 220% 100%; background-position: 115% 0; }
[data-dhp-title].is-visible .dhp-sweep {
  animation: dhpTitleSweep 900ms cubic-bezier(.16, 1, .3, 1) calc(var(--dhp-reveal-delay, 0ms) + 240ms) both;
}
@keyframes dhpTitleSweep { from { background-position: 115% 0; } to { background-position: 0 0; } }

/* 섹션 헤더 언더라인 드로우 (opt-in: 제목에 .dhp-tunderline) */
.dhp-tunderline { position: relative; }
.dhp-tunderline::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -14px;
  width: 56px;
  height: 3px;
  border-radius: 9999px;
  transform: translateX(-50%) scaleX(0);
  transform-origin: center;
  background: linear-gradient(90deg, var(--dhp-primary, #2563eb), var(--dhp-primary-strong, #1d4ed8));
  transition: transform 620ms cubic-bezier(.16, 1, .3, 1) calc(var(--dhp-reveal-delay, 0ms) + 220ms);
}
.dhp-tunderline.is-visible::after { transform: translateX(-50%) scaleX(1); }

@media (prefers-reduced-motion: reduce) {
  [data-dhp-title] { opacity: 1; transform: none; filter: none; transition: none; }
  [data-dhp-title] .dhp-sweep { animation: none; background-position: 0 0; }
  .dhp-tunderline::after { transition: none; transform: translateX(-50%) scaleX(1); }
}