/*!
 * iSeodang HyFlex — 프론트 스타일 + 모션 디자인 시스템
 *
 * 모션 규약 (성능과 화려함을 동시에 얻기 위한 절대 규칙)
 *  ✅ 애니메이션 허용: transform / opacity / filter
 *  ❌ 애니메이션 금지: width height top left margin padding box-shadow background-position
 *     → 금지 목록은 레이아웃 재계산(reflow)을 일으켜 카드 12장에서 프레임이 무너진다.
 *     → 그림자 애니메이션이 필요하면 의사요소를 미리 깔고 opacity 만 바꾼다.
 *  ✅ will-change 는 상시 선언하지 않는다 (GPU 메모리 폭증).
 *  ✅ 모든 셀렉터는 #isd-hf-root 하위로 스코프 → Elementor·테마와 충돌하지 않는다.
 */

#isd-hf-root {
	/* ---- 색상 (iseodang-brand-standard 로 치환할 것) ---- */
	--isd-hf-beginner: #2A2E9E;
	--isd-hf-intermediate: #25257E;
	--isd-hf-advanced: #E30613;
	--isd-hf-ink: #1A1A1A;
	--isd-hf-muted: #6B6B6B;
	--isd-hf-line: #DDD8CE;
	--isd-hf-bg: #ffffff;
	--isd-hf-soft: #FAF7F1;
	--isd-hf-accent: #25257E;   /* Seodang Navy — UI 크롬 */
	--isd-hf-cta: #E30613;      /* i Red — 강조 CTA 전용 (브랜드 표준) */

	/* ---- 형태 ---- */
	--isd-hf-radius: 16px;
	--isd-hf-radius-sm: 10px;
	--isd-hf-gap: clamp(12px, 2vw, 24px);

	/* ---- 모션 토큰 ---- */
	--isd-hf-dur-instant: 120ms;
	--isd-hf-dur-fast: 200ms;
	--isd-hf-dur-base: 320ms;
	--isd-hf-dur-slow: 520ms;
	--isd-hf-ease-out: cubic-bezier(.16, 1, .3, 1);
	--isd-hf-ease-in: cubic-bezier(.7, 0, .84, 0);
	--isd-hf-ease-spring: cubic-bezier(.34, 1.56, .64, 1);

	color: var(--isd-hf-ink);
	font-family: inherit;
	line-height: 1.6;
}

#isd-hf-root *,
#isd-hf-root *::before,
#isd-hf-root *::after { box-sizing: border-box; }

#isd-hf-root img { max-width: 100%; height: auto; display: block; }

/* =====================================================================
 * 스크롤 진입 등장 — IntersectionObserver 가 .is-in 을 붙인다
 * 스태거는 JS 가 --isd-hf-delay 로 넣는다 (뷰포트 내 요소에만)
 * ================================================================== */
#isd-hf-root [data-reveal] {
	opacity: 0;
	transform: translate3d(0, 18px, 0);
	transition:
		opacity var(--isd-hf-dur-base) var(--isd-hf-ease-out),
		transform var(--isd-hf-dur-base) var(--isd-hf-ease-out);
	transition-delay: var(--isd-hf-delay, 0ms);
}
#isd-hf-root [data-reveal].is-in {
	opacity: 1;
	transform: translate3d(0, 0, 0);
}

/* =====================================================================
 * 히어로
 * ================================================================== */
.isd-hf-hero { margin: 0 0 clamp(20px, 4vw, 40px); }
.isd-hf-hero__title {
	margin: 0 0 6px;
	font-size: clamp(24px, 4vw, 38px);
	font-weight: 800;
	letter-spacing: -.02em;
}
.isd-hf-hero__sub { margin: 0; color: var(--isd-hf-muted); font-size: clamp(14px, 1.6vw, 17px); }

/* =====================================================================
 * 빵부스러기
 * ================================================================== */
.isd-hf-crumb { margin: 0 0 18px; font-size: 13px; }
.isd-hf-crumb ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.isd-hf-crumb li + li::before { content: "›"; color: var(--isd-hf-muted); margin-right: 6px; }
.isd-hf-crumb a { color: var(--isd-hf-muted); text-decoration: none; }
.isd-hf-crumb a:hover { color: var(--isd-hf-accent); }
.isd-hf-crumb [aria-current] { color: var(--isd-hf-ink); font-weight: 700; }

/* =====================================================================
 * 카드 그리드
 * ================================================================== */
.isd-hf-grid { display: grid; gap: var(--isd-hf-gap); }
.isd-hf-grid--levels { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.isd-hf-grid--books { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

.isd-hf-card {
	position: relative;
	display: block;
	background: var(--isd-hf-bg);
	border: 1px solid var(--isd-hf-line);
	border-radius: var(--isd-hf-radius);
	overflow: hidden;
	text-decoration: none;
	color: inherit;
	/* transform 만 애니메이션한다. box-shadow 는 아래 ::after 로 처리. */
	transition: transform var(--isd-hf-dur-base) var(--isd-hf-ease-out);
}

/* 그림자를 미리 깔아두고 opacity 만 바꾼다 → paint 재계산 없음 */
.isd-hf-card::after {
	content: "";
	position: absolute;
	inset: 0;
	border-radius: inherit;
	box-shadow: 0 18px 40px -12px rgba(0, 0, 0, .28);
	opacity: 0;
	transition: opacity var(--isd-hf-dur-base) var(--isd-hf-ease-out);
	pointer-events: none;
}

.isd-hf-card:hover:not(.is-locked),
.isd-hf-card:focus-visible:not(.is-locked) { transform: translate3d(0, -6px, 0) scale(1.015); }
.isd-hf-card:hover:not(.is-locked)::after,
.isd-hf-card:focus-visible:not(.is-locked)::after { opacity: 1; }

.isd-hf-card:focus-visible { outline: 3px solid var(--isd-hf-accent); outline-offset: 3px; }

/* ---- 레벨 카드: Ken Burns ---- */
.isd-hf-card__media {
	display: block;
	position: relative;
	aspect-ratio: 16 / 9;
	overflow: hidden;
	background: var(--isd-hf-soft);
}
.isd-hf-card__media img {
	width: 100%; height: 100%; object-fit: cover;
	transition: transform var(--isd-hf-dur-slow) var(--isd-hf-ease-out);
}
.isd-hf-card:hover:not(.is-locked) .isd-hf-card__media img { transform: scale(1.06); }

.isd-hf-card__media::after {
	content: "";
	position: absolute; inset: 0;
	background: linear-gradient(180deg, rgba(0,0,0,0) 45%, rgba(0,0,0,.55) 100%);
}

.isd-hf-card__body { display: block; padding: 16px 18px 18px; }
.isd-hf-card__eyebrow {
	display: block; font-size: 11px; font-weight: 800;
	letter-spacing: .12em; color: var(--isd-hf-muted); margin-bottom: 4px;
}
.isd-hf-card__title { display: block; font-size: 19px; font-weight: 800; letter-spacing: -.01em; }
.isd-hf-card__sub { display: block; margin-top: 3px; font-size: 13px; color: var(--isd-hf-muted); }
.isd-hf-card__meta { display: block; margin-top: 8px; font-size: 13px; color: var(--isd-hf-muted); }

.isd-hf-card--beginner .isd-hf-card__eyebrow { color: var(--isd-hf-beginner); }
.isd-hf-card--intermediate .isd-hf-card__eyebrow { color: var(--isd-hf-intermediate); }
.isd-hf-card--advanced .isd-hf-card__eyebrow { color: var(--isd-hf-advanced); }

/* ---- 잠김 ---- */
.isd-hf-card.is-locked { cursor: not-allowed; }
.isd-hf-card.is-locked .isd-hf-card__media img,
.isd-hf-card.is-locked .isd-hf-book__cover img { filter: grayscale(1); opacity: .5; }
.isd-hf-lock__icon { font-size: 13px; line-height: 1; }
.isd-hf-lock {
	display: inline-flex; align-items: center; gap: 6px;
	margin-top: 10px; padding: 5px 12px;
	background: var(--isd-hf-soft); border-radius: 20px;
	font-size: 12px; font-weight: 700; color: var(--isd-hf-muted);
}
@keyframes isd-hf-shake {
	0%, 100% { transform: translate3d(0, 0, 0); }
	20% { transform: translate3d(-7px, 0, 0); }
	40% { transform: translate3d(6px, 0, 0); }
	60% { transform: translate3d(-4px, 0, 0); }
	80% { transform: translate3d(2px, 0, 0); }
}
.isd-hf-card.is-shaking { animation: isd-hf-shake 320ms var(--isd-hf-ease-out); }

/* ---- 책자 카드: 3D 살짝 열림 + 광택 스윕 ---- */
.isd-hf-book__cover {
	display: block; position: relative;
	aspect-ratio: 3 / 4; overflow: hidden;
	background: var(--isd-hf-soft);
	perspective: 900px;
}
.isd-hf-book__cover img {
	width: 100%; height: 100%; object-fit: cover;
	transform-origin: left center;
	transition: transform var(--isd-hf-dur-base) var(--isd-hf-ease-out);
}
.isd-hf-card--book:hover:not(.is-locked) .isd-hf-book__cover img { transform: rotateY(-8deg) scale(1.02); }

.isd-hf-book__code {
	position: absolute; left: 50%; top: 46%;
	transform: translate(-50%, -50%);
	font-size: clamp(38px, 6vw, 58px); font-weight: 900;
	color: #fff; letter-spacing: -.03em;
	text-shadow: 0 2px 14px rgba(0, 0, 0, .35);
	pointer-events: none;
}
.isd-hf-book__gloss {
	position: absolute; top: 0; left: -60%;
	width: 45%; height: 100%;
	background: linear-gradient(105deg, rgba(255,255,255,0) 0%, rgba(255,255,255,.45) 50%, rgba(255,255,255,0) 100%);
	transform: translate3d(0, 0, 0);
	opacity: 0;
	pointer-events: none;
}
@keyframes isd-hf-gloss {
	0% { transform: translate3d(0, 0, 0); opacity: 0; }
	15% { opacity: 1; }
	100% { transform: translate3d(360%, 0, 0); opacity: 0; }
}
.isd-hf-card--book:hover:not(.is-locked) .isd-hf-book__gloss { animation: isd-hf-gloss 700ms var(--isd-hf-ease-out); }

/* ---- 배지 ---- */
.isd-hf-badges { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.isd-hf-badge {
	display: inline-block; padding: 3px 9px; border-radius: 6px;
	font-size: 11px; font-weight: 700;
	background: var(--isd-hf-soft); color: var(--isd-hf-muted);
}
.isd-hf-badge--topik { background: rgba(37, 37, 126, .1); color: var(--isd-hf-accent); }
.isd-hf-badge--warn { background: #fff3e0; color: #b45309; }

/* =====================================================================
 * 강의 목록
 * ================================================================== */
.isd-hf-course { display: grid; gap: var(--isd-hf-gap); grid-template-columns: minmax(240px, 300px) 1fr; align-items: start; }
@media (max-width: 900px) { .isd-hf-course { grid-template-columns: 1fr; } }

.isd-hf-course__panel {
	position: sticky; top: 20px;
	padding: 20px; border: 1px solid var(--isd-hf-line);
	border-radius: var(--isd-hf-radius); background: var(--isd-hf-bg);
}
@media (max-width: 900px) { .isd-hf-course__panel { position: static; } }

.isd-hf-course__title { margin: 0 0 4px; font-size: 20px; font-weight: 800; }
.isd-hf-course__sub { margin: 0 0 14px; font-size: 13px; color: var(--isd-hf-muted); }
.isd-hf-course__stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 0; }
.isd-hf-course__stats div { text-align: center; padding: 10px 4px; background: var(--isd-hf-soft); border-radius: var(--isd-hf-radius-sm); }
.isd-hf-course__stats dt { font-size: 11px; color: var(--isd-hf-muted); }
.isd-hf-course__stats dd { margin: 2px 0 0; font-size: 14px; font-weight: 800; }

/* ★ min-width:0 이 없으면 긴 강의 제목이 그리드 트랙을 밀어내
   좁은 화면에서 가로 스크롤이 생긴다. grid 자식의 기본 min-width 는 auto 다. */
.isd-hf-course__list { min-width: 0; }

.isd-hf-note { margin: 14px 0 0; padding: 10px 12px; border-radius: var(--isd-hf-radius-sm); font-size: 12.5px; }
.isd-hf-note--warn { background: #fff3e0; color: #b45309; }

.isd-hf-toolbar { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 12px; }
.isd-hf-search {
	flex: 1 1 200px; padding: 10px 14px;
	border: 1px solid var(--isd-hf-line); border-radius: var(--isd-hf-radius-sm);
	font-size: 14px; background: var(--isd-hf-bg); color: inherit;
}
.isd-hf-search:focus-visible { outline: 2px solid var(--isd-hf-accent); outline-offset: 1px; }
.isd-hf-toggle { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; cursor: pointer; user-select: none; }

.isd-hf-lessons { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; counter-reset: none; }

.isd-hf-lesson { position: relative; }
.isd-hf-lesson__link {
	display: grid;
	grid-template-columns: 44px 1fr auto;
	gap: 12px; align-items: center;
	padding: 12px 14px;
	border: 1px solid var(--isd-hf-line);
	border-radius: var(--isd-hf-radius-sm);
	background: var(--isd-hf-bg);
	text-decoration: none; color: inherit;
	min-height: 56px;
	transition: transform var(--isd-hf-dur-fast) var(--isd-hf-ease-out);
}
/* 좌측 accent bar — scaleX 만 애니메이션 */
.isd-hf-lesson__link::before {
	content: "";
	position: absolute; left: 0; top: 8px; bottom: 8px; width: 3px;
	border-radius: 3px; background: var(--isd-hf-accent);
	transform: scaleX(0); transform-origin: left center;
	transition: transform var(--isd-hf-dur-fast) var(--isd-hf-ease-out);
}
a.isd-hf-lesson__link:hover::before,
a.isd-hf-lesson__link:focus-visible::before { transform: scaleX(1); }
a.isd-hf-lesson__link:hover { transform: translate3d(3px, 0, 0); }
a.isd-hf-lesson__link:focus-visible { outline: 2px solid var(--isd-hf-accent); outline-offset: 2px; }

.isd-hf-lesson.is-soon .isd-hf-lesson__link,
.isd-hf-lesson.is-locked .isd-hf-lesson__link { opacity: .58; cursor: not-allowed; }

.isd-hf-lesson__no {
	display: grid; place-items: center;
	width: 44px; height: 44px; border-radius: 50%;
	background: var(--isd-hf-soft); font-weight: 800; font-size: 15px;
}
.isd-hf-lesson.is-done .isd-hf-lesson__no { background: rgba(37, 37, 126, .12); color: var(--isd-hf-accent); }

.isd-hf-lesson__main { min-width: 0; }
.isd-hf-lesson__title { display: block; font-weight: 700; font-size: 15px; word-break: keep-all; }
.isd-hf-lesson__title-en { display: block; font-size: 12px; color: var(--isd-hf-muted); }

.isd-hf-progress { display: block; margin-top: 7px; height: 4px; border-radius: 4px; background: var(--isd-hf-soft); overflow: hidden; }
.isd-hf-progress__bar {
	display: block; height: 100%; border-radius: 4px; background: var(--isd-hf-accent);
	transform-origin: left center;
}

.isd-hf-lesson__side { display: flex; align-items: center; gap: 10px; }
.isd-hf-lesson__time { font-size: 13px; color: var(--isd-hf-muted); white-space: nowrap; }
.isd-hf-lesson__time small { font-size: 10px; margin-left: 1px; }
.isd-hf-lesson__ppt { font-size: 15px; }

.isd-hf-state { padding: 4px 10px; border-radius: 20px; font-size: 11.5px; font-weight: 700; white-space: nowrap; }
.isd-hf-state--ready { background: rgba(37, 37, 126, .1); color: var(--isd-hf-accent); }
.isd-hf-state--watching { background: rgba(37, 37, 126, .1); color: var(--isd-hf-intermediate); }
.isd-hf-state--done { background: var(--isd-hf-accent); color: #fff; }
.isd-hf-state--soon { background: var(--isd-hf-soft); color: var(--isd-hf-muted); }
.isd-hf-state--locked { background: #fdecec; color: #b91c1c; }

/* =====================================================================
 * 플레이어
 * ================================================================== */
.isd-hf-player { min-width: 0; }

/* ★ 반드시 flex — grid 로 두면 안 된다.
 *   Split.js 는 두 패널 "사이"에 .gutter 요소를 DOM 에 끼워 넣고,
 *   각 패널에 인라인 width:calc(68% - 4px) 를 직접 박는 방식으로 동작한다.
 *   부모가 grid(1fr 380px) 이면 gutter 가 두 번째 컬럼을 차지해 버려서
 *   슬라이드 패널이 다음 줄(2행 1열)로 밀리고, 두 패널 모두 폭이 무너진다.
 *   (2026-09-07 실측 재현: video 544px / gutter 8px / slides 254px 세로 적층)
 *   Split.js 공식 요구사항대로 flex-direction:row 로 두고,
 *   gap 은 gutterSize(8px) 와 이중 계산되므로 쓰지 않는다. */
.isd-hf-stage { display: flex; flex-direction: row; align-items: stretch; }

/* Split.js 가 붙기 전 · JS 실패 시 · 1023px 이하에서도 무너지지 않는 기본값.
 *   Split 이 붙으면 인라인 width 가 이 값을 덮어쓴다(인라인 우선). */
.isd-hf-stage > .isd-hf-pane { min-width: 0; }
.isd-hf-pane--video  { flex: 1 1 auto; }
.isd-hf-pane--slides { flex: 0 0 380px; }

/* Split.js 가 삽입하는 손잡이. 높이를 주지 않으면 h=0 이라 잡히지 않는다. */
.isd-hf-stage > .gutter {
	flex: 0 0 8px;
	align-self: stretch;
	margin: 0 3px;
	border-radius: 4px;
	background: var(--isd-hf-line);
	cursor: col-resize;
	transition: background var(--isd-hf-dur-fast) linear;
}
.isd-hf-stage > .gutter:hover { background: var(--isd-hf-accent); }

@media (max-width: 1023px) {
	/* 이 폭에서는 mountSplit() 이 early-return 하므로 gutter 자체가 없다. */
	.isd-hf-stage { flex-direction: column; gap: 14px; }
	.isd-hf-pane--video,
	.isd-hf-pane--slides { flex: 1 1 auto; width: auto !important; }
}

.isd-hf-pane {
	border: 1px solid var(--isd-hf-line);
	border-radius: var(--isd-hf-radius);
	background: var(--isd-hf-bg);
	overflow: hidden;
	opacity: 0; transform: scale(.985);
	animation: isd-hf-pane-in var(--isd-hf-dur-base) var(--isd-hf-ease-out) forwards;
}
.isd-hf-pane--slides { animation-delay: 90ms; }
@keyframes isd-hf-pane-in { to { opacity: 1; transform: scale(1); } }

.isd-hf-video { position: relative; aspect-ratio: 16 / 9; background: #000; }
.isd-hf-video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

/* 스켈레톤 시머 — 스피너 대신 (레이아웃 시프트 없음) */
.isd-hf-skeleton {
	position: absolute; inset: 0;
	background: linear-gradient(100deg, #1a1a1a 30%, #262626 50%, #1a1a1a 70%);
	background-size: 220% 100%;
	animation: isd-hf-shimmer 1.4s linear infinite;
}
@keyframes isd-hf-shimmer { from { background-position: 180% 0; } to { background-position: -20% 0; } }

.isd-hf-nav { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 12px 14px; border-top: 1px solid var(--isd-hf-line); }
.isd-hf-nav__btn { font-size: 13px; font-weight: 700; color: var(--isd-hf-accent); text-decoration: none; white-space: nowrap; }
.isd-hf-nav__btn.is-disabled { color: var(--isd-hf-line); }
.isd-hf-nav__title { font-size: 13.5px; font-weight: 700; text-align: center; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.isd-hf-pane--slides { display: flex; flex-direction: column; min-height: 320px; }
.isd-hf-slides__head { display: flex; align-items: center; justify-content: space-between; padding: 10px 14px; border-bottom: 1px solid var(--isd-hf-line); font-size: 13px; font-weight: 700; }
.isd-hf-slides { flex: 1; display: grid; place-items: center; padding: 12px; background: var(--isd-hf-soft); min-height: 260px; }
.isd-hf-slides canvas { max-width: 100%; height: auto; border-radius: 6px; background: #fff; }
.isd-hf-slides__foot { display: flex; align-items: center; gap: 8px; padding: 10px 14px; border-top: 1px solid var(--isd-hf-line); }
.isd-hf-slides__count { font-size: 13px; color: var(--isd-hf-muted); min-width: 54px; text-align: center; }

.isd-hf-empty { text-align: center; color: var(--isd-hf-muted); font-size: 13px; }
.isd-hf-empty img { width: 132px; margin: 0 auto 10px; opacity: .55; }

.isd-hf-icon-btn {
	width: 34px; height: 34px; display: grid; place-items: center;
	border: 1px solid var(--isd-hf-line); border-radius: 8px;
	background: var(--isd-hf-bg); cursor: pointer; color: inherit;
	transition: transform var(--isd-hf-dur-instant) var(--isd-hf-ease-out);
}
.isd-hf-icon-btn:active { transform: scale(.9); }

.isd-hf-btn {
	display: inline-block; padding: 11px 22px;
	background: var(--isd-hf-cta); color: #fff;
	border: 0; border-radius: 10px;
	font-size: 14px; font-weight: 700; text-decoration: none; cursor: pointer;
	/* 패널 폭이 좁아져도 "PPT 다운로드" 가 한 글자씩 세로로 쪼개지지 않게 한다. */
	white-space: nowrap;
	transition: transform var(--isd-hf-dur-instant) var(--isd-hf-ease-out), opacity var(--isd-hf-dur-fast) linear;
}
.isd-hf-btn:hover { opacity: .92; }
.isd-hf-btn:active { transform: scale(.96); }
.isd-hf-btn--sm { margin-left: auto; padding: 7px 14px; font-size: 12.5px; }

.isd-hf-blocked { text-align: center; padding: clamp(30px, 6vw, 60px) 20px; }
.isd-hf-blocked__img { width: 160px; margin: 0 auto 16px; opacity: .6; }
.isd-hf-blocked h2 { margin: 0 0 8px; font-size: 20px; }
.isd-hf-blocked p { margin: 0 0 18px; color: var(--isd-hf-muted); font-size: 14px; }

.isd-hf-hint { margin-top: 16px; padding: 12px 16px; background: #fff3e0; color: #b45309; border-radius: var(--isd-hf-radius-sm); font-size: 13.5px; }

/* =====================================================================
 * 토스트 · 완료 팝
 * ================================================================== */
.isd-hf-toast {
	position: fixed; left: 50%; bottom: 24px; z-index: 9999;
	display: flex; align-items: center; gap: 12px;
	padding: 13px 18px; border-radius: 12px;
	background: rgba(0, 0, 0, .96); color: #fff; font-size: 14px;
	box-shadow: 0 16px 40px -12px rgba(0, 0, 0, .45);
	transform: translate3d(-50%, 130%, 0); opacity: 0;
	transition: transform var(--isd-hf-dur-base) var(--isd-hf-ease-spring), opacity var(--isd-hf-dur-fast) linear;
}
.isd-hf-toast.is-in { transform: translate3d(-50%, 0, 0); opacity: 1; }
.isd-hf-toast button {
	background: rgba(255, 255, 255, .16); color: #fff;
	border: 0; border-radius: 8px; padding: 6px 12px;
	font-size: 13px; font-weight: 700; cursor: pointer;
}

@keyframes isd-hf-pop {
	0% { transform: scale(.3); opacity: 0; }
	60% { transform: scale(1.14); opacity: 1; }
	100% { transform: scale(1); opacity: 1; }
}
@keyframes isd-hf-ring {
	0% { transform: scale(.6); opacity: .7; }
	100% { transform: scale(2.1); opacity: 0; }
}
.isd-hf-complete {
	position: fixed; left: 50%; top: 50%; z-index: 9999;
	width: 96px; height: 96px; margin: -48px 0 0 -48px;
	display: grid; place-items: center;
	border-radius: 50%; background: var(--isd-hf-accent); color: #fff;
	font-size: 44px; pointer-events: none;
	animation: isd-hf-pop 520ms var(--isd-hf-ease-spring) forwards;
}
.isd-hf-complete::after {
	content: ""; position: absolute; inset: 0;
	border-radius: 50%; border: 3px solid var(--isd-hf-accent);
	animation: isd-hf-ring 700ms var(--isd-hf-ease-out) forwards;
}

/* Split.js 게터 */
.gutter { background-color: var(--isd-hf-line); background-repeat: no-repeat; background-position: 50%; cursor: col-resize; border-radius: 3px; }
.gutter.gutter-horizontal { width: 8px !important; }

/* =====================================================================
 * 접근성 — 모션 축소 요청은 타협 없이 존중한다
 * ================================================================== */
@media (prefers-reduced-motion: reduce) {
	#isd-hf-root *,
	#isd-hf-root *::before,
	#isd-hf-root *::after,
	.isd-hf-toast,
	.isd-hf-complete {
		animation-duration: .01ms !important;
		animation-iteration-count: 1 !important;
		transition-duration: .01ms !important;
		scroll-behavior: auto !important;
	}
	#isd-hf-root [data-reveal] { opacity: 1; transform: none; }
}

/* 다크 모드 대응 (테마가 지원할 때만) */
@media (prefers-color-scheme: dark) {
	#isd-hf-root:not([data-theme="light"]) {
		--isd-hf-bg: #141414;
		--isd-hf-soft: #1F1F1F;
		--isd-hf-line: #333333;
		--isd-hf-ink: #EDEDED;
		--isd-hf-muted: #A5A5A5;
	}
}