/* ==========================================================================
   모션 — 등장 효과, 히어로 애니메이션, 카드 틸트, 스크롤 연동 효과
   (js/motion.js 와 함께 동작, 움직임 줄이기 설정 시 모두 꺼짐)
   ========================================================================== */

/* ---------- 스크롤 진행 막대 / 헤더 숨김 ---------- */
.scroll-progress {
  position: fixed; top: 0; left: 0; z-index: 80; width: 100%; height: 3px;
  background: var(--black); transform-origin: left; transform: scaleX(0);
}
.site-header { transition: transform .45s var(--ease); }
.site-header.is-hidden { transform: translateY(-100%); }

/* ---------- 등장 효과 ---------- */
.reveal {
  opacity: 0; transform: translateY(70px);
  transition: opacity 1s var(--ease), transform 1.1s var(--ease);
  transition-delay: var(--d, 0s);
}
.reveal--left { transform: translateX(-70px); }
.reveal--right { transform: translateX(70px); }
.reveal--scale { transform: scale(.86); }
.reveal--fly { transform: translateX(160px) translateY(-50px) scale(.88); }
.reveal--flip { transform: perspective(1000px) rotateY(-60deg); transform-origin: left center; }
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 히어로 ---------- */
.hero { position: relative; overflow: hidden; }
.hero .container { position: relative; z-index: 1; }
.hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; z-index: 0; }

@keyframes rise-in { from { opacity: 0; transform: translateY(40px); } to { opacity: 1; transform: none; } }
@keyframes line-up { from { transform: translateY(105%); } to { transform: none; } }
.rise { animation: rise-in 1s var(--ease) both; animation-delay: calc(var(--i, 0) * .12s + .1s); }

.hero h1 .line { display: block; overflow: hidden; padding-bottom: .06em; }
.hero h1 .line > span { display: inline-block; animation: line-up 1.1s var(--ease) both; animation-delay: calc(var(--i, 0) * .14s + .15s); }

/* 바뀌는 키워드 */
.rotator {
  position: relative; display: inline-block; vertical-align: bottom;
  height: 1.2em; overflow: hidden;
  background: var(--black); color: var(--white);
  padding: 0 .18em; margin-right: .04em;
  transition: width .6s var(--ease);
}
.rotator b {
  position: absolute; left: .18em; top: 0; white-space: nowrap; font-weight: inherit;
  opacity: 0; transform: translateY(110%);
  transition: transform .7s var(--ease), opacity .45s var(--ease), filter .45s var(--ease);
}
.rotator b.is-active { opacity: 1; transform: none; filter: none; }
.rotator b.is-out { opacity: 0; transform: translateY(-110%); filter: blur(6px); }
.rotator b.no-anim { transition: none !important; } /* 대기 위치로 돌아갈 때 화면을 가로지르지 않도록 */
.rotator:not(.is-ready) b.is-active { position: relative; left: 0; } /* JS 실행 전에도 첫 단어 표시 */

.hero-media .frame { transform: translateZ(0); }
.hero-media video { scale: 1.08; }

/* ---------- 카드 틸트 + 스포트라이트 ---------- */
.pain-grid, .service-grid, .case-grid, .blog-grid, .channel-list, .principles { perspective: 1200px; }
.tilt {
  position: relative;
  rotate: var(--tx, 0) var(--ty, 1) 0 var(--ta, 0deg);
  transition: rotate .5s var(--ease), border-color .3s, background .35s var(--ease), color .35s var(--ease), transform .3s var(--ease);
  will-change: rotate;
}
.tilt.is-tilting { transition: rotate .08s linear, border-color .3s, background .35s var(--ease), color .35s var(--ease); }
/* 등장하는 동안에는 등장 효과의 전환을 우선 (등장이 끝나면 JS가 reveal 클래스를 걷어냄) */
.reveal.tilt { transition: opacity 1s var(--ease), transform 1.1s var(--ease); transition-delay: var(--d, 0s); }
.tilt::after {
  content: ''; position: absolute; inset: 0; pointer-events: none; opacity: 0; transition: opacity .35s;
  background: radial-gradient(280px circle at var(--mx, 50%) var(--my, 50%), var(--spot, rgba(0, 0, 0, .07)), transparent 65%);
}
.tilt:hover::after { opacity: 1; }
.service-card.tilt:hover, .blog-card--case a.tilt:hover, .channel.tilt:hover { --spot: rgba(255, 255, 255, .16); }

/* ---------- 스크롤에 따라 채워지는 문장 ---------- */
.statement { padding: clamp(96px, 14vw, 180px) 0; }
.scrub { font-size: clamp(28px, 4.6vw, 60px); font-weight: 800; line-height: 1.35; letter-spacing: -0.04em; max-width: 1080px; }
.scrub .w { color: var(--gray-300); transition: color .35s var(--ease); }
.scrub .w.on { color: var(--black); }
.statement .sign { margin-top: 40px; display: flex; align-items: center; gap: 16px; font-weight: 700; }
.statement .sign::before { content: ''; width: 48px; height: 1.5px; background: var(--black); }

/* ---------- 이미지 패럴랙스 ---------- */
.split-media, .photo-grid figure { overflow: hidden; }
[data-parallax] { scale: 1.12; will-change: translate; }

/* ---------- 절차: 연결선 그리기 ---------- */
.steps { position: relative; }
.steps::before {
  content: ''; position: absolute; left: 0; right: 0; top: 0; height: 1.5px; background: currentColor;
  transform: scaleX(0); transform-origin: left; transition: transform 1.6s var(--ease);
}
.steps.is-drawn::before { transform: scaleX(1); }
.step { border-top-color: transparent; position: relative; }
.step::after {
  content: ''; position: absolute; top: -6px; left: 0; width: 11px; height: 11px; border-radius: 50%;
  background: currentColor; transform: scale(0); transition: transform .5s var(--ease); transition-delay: var(--d, 0s);
}
.step + .step::after { left: 24px; }
.steps.is-drawn .step::after { transform: scale(1); }

/* ---------- 타임라인 선 ---------- */
.timeline { border-left: 0; position: relative; }
.timeline::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 1.5px; background: var(--black);
  transform: scaleY(0); transform-origin: top; transition: transform 1.8s var(--ease);
}
.timeline.is-drawn::before { transform: scaleY(1); }

/* ---------- 2줄 후기 흐름 ---------- */
.marquee + .marquee { margin-top: 20px; }
.marquee__track--reverse { animation-direction: reverse; animation-duration: 70s; }
.marquee--chat .shot { width: auto; }
.marquee--chat .shot img { height: 340px; width: auto; }

/* ---------- 실시간 표시 ---------- */
.live { display: inline-flex; align-items: center; gap: 10px; font-size: 14px; font-weight: 700; margin-bottom: 16px; }
.live i { position: relative; width: 9px; height: 9px; border-radius: 50%; background: var(--black); }
.live i::after { content: ''; position: absolute; inset: 0; border-radius: 50%; background: var(--black); animation: ping 1.6s cubic-bezier(0, 0, .2, 1) infinite; }
@keyframes ping { 75%, 100% { transform: scale(2.6); opacity: 0; } }

/* ---------- CTA 오로라 배경 ---------- */
.cta-band { position: relative; overflow: hidden; }
.cta-band .container { position: relative; z-index: 1; }
.aurora { position: absolute; inset: 0; pointer-events: none; }
.aurora i { position: absolute; border-radius: 50%; filter: blur(70px); background: radial-gradient(circle, rgba(255, 255, 255, .20), transparent 70%); }
.aurora i:nth-child(1) { width: 640px; height: 640px; left: -10%; top: -60%; animation: aurora-a 18s ease-in-out infinite alternate; }
.aurora i:nth-child(2) { width: 460px; height: 460px; right: -5%; bottom: -70%; animation: aurora-b 22s ease-in-out infinite alternate; }
.aurora i:nth-child(3) { width: 320px; height: 320px; left: 45%; top: 10%; opacity: .7; animation: aurora-c 26s ease-in-out infinite alternate; }
@keyframes aurora-a { to { transform: translate(30%, 40%) scale(1.2); } }
@keyframes aurora-b { to { transform: translate(-40%, -30%) scale(1.3); } }
@keyframes aurora-c { to { transform: translate(-60%, 30%) scale(.8); } }

/* ---------- 버튼 반짝임 ---------- */
.btn--primary { position: relative; overflow: hidden; isolation: isolate; }
.btn--primary::before {
  content: ''; position: absolute; top: 0; bottom: 0; left: -60%; width: 40%; z-index: -1;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, .28), transparent);
  transform: skewX(-20deg); animation: shine 4.5s ease-in-out infinite;
}
.btn--primary:hover::before { animation: none; opacity: 0; }
@keyframes shine { 0%, 70% { left: -60%; } 100% { left: 130%; } }

/* ---------- 플로팅 버튼 숨 쉬기 ---------- */
.fab__toggle { animation: breathe 3s ease-in-out infinite; }
.fab.is-open .fab__toggle, .fab__toggle:hover { animation: none; }
@keyframes breathe { 50% { box-shadow: 0 10px 30px rgba(0, 0, 0, .25), 0 0 0 10px rgba(10, 10, 10, .08); } }

@media (max-width: 900px) {
  .step + .step::after { left: 0; }
  .step:nth-child(even)::after { left: 24px; }
  .marquee--chat .shot img { height: 260px; }
}
@media (max-width: 600px) {
  .step:nth-child(even)::after { left: 0; }
  .aurora i:nth-child(1) { width: 380px; height: 380px; }
}

@media (prefers-reduced-motion: reduce) {
  .reveal, .rise, .hero h1 .line > span { opacity: 1 !important; transform: none !important; animation: none !important; transition: none !important; }
  .aurora i, .btn--primary::before, .fab__toggle, .live i::after { animation: none !important; }
  .steps::before, .timeline::before { transform: none; }
  .step::after { transform: scale(1); }
  .scrub .w { color: var(--black); }
  .tilt { rotate: none !important; }
  [data-parallax] { scale: 1; translate: none !important; }
}