/* ================================================================
   css/vocab.css
   ================================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --c-bg        : #f8f7f2;
  --c-surface   : #ffffff;
  --c-border    : rgba(0,0,0,0.08);
  --c-text      : #1a1a1a;
  --c-muted     : #7a7a72;
  --c-accent    : #1d9e75;
  --c-blank     : #d4d2c8;
  --c-highlight : #1d9e75;

  --c-fs-text   : #ffffff;
  --c-fs-muted  : rgba(255,255,255,0.65);
  --c-fs-hl     : #facc15;

  --snap-fade   : 350ms;
  --reveal-dur  : 220ms;
  --example-dur : 400ms;
  --fs-blur-dur : 400ms;
  --fs-fade-dur : 220ms;

  --radius-card : 16px;
  --radius-media: 12px;
}

body {
  background: var(--c-bg);
  font-family: 'Georgia', serif;
  color: var(--c-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  gap: 1.25rem;
}

/* ── 시작 버튼 ──────────────────────────────────────────────── */
#vocab-start-wrap {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
}

#vocab-start {
  padding: 0.75rem 2.5rem;
  font-size: 1rem;
  font-family: 'Georgia', serif;
  color: var(--c-accent);
  background: transparent;
  border: 1.5px solid var(--c-accent);
  border-radius: 999px;
  cursor: pointer;
  letter-spacing: 0.04em;
  white-space: nowrap;
  transition: background 0.15s ease, color 0.15s ease;
}

#vocab-start:hover {
  background: var(--c-accent);
  color: #ffffff;
}

/* ── 카드 루트 ──────────────────────────────────────────────── */
#vocab-root {
  flex: 1;
  min-width: 0;
  position: relative;
}

.vocab-card {
  display: none;
  background: var(--c-surface);
  border-radius: var(--radius-card);
  border: 1px solid var(--c-border);
  padding: 1.75rem;
  gap: 1.5rem;
  flex-direction: column;
}
.vocab-card.is-active { display: flex; }

/* ── 미디어 래퍼 ────────────────────────────────────────────── */
.vocab-card__media-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-media);
  overflow: hidden;
  background: #e8e6df;
}

.vocab-card__media {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
}

/* ── 스냅 오버레이 ──────────────────────────────────────────── */
.vocab-card__snap {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-media);
  background: #e8e6df;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--snap-fade) ease;
}
.vocab-card__snap.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.vocab-thumb {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center center;
  border-radius: var(--radius-media);
  display: block;
}

.vocab-media-placeholder {
  width: 100%; height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  background: #e8e6df;
}

/* ── 텍스트 영역 ────────────────────────────────────────────── */
.vocab-card__info {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.vocab-card__pos {
  font-size: 0.75rem;
  font-style: italic;
  color: var(--c-muted);
  letter-spacing: 0.04em;
}

/* ── 단어 행 ────────────────────────────────────────────────── */
.vocab-card__word-row {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  align-items: flex-end;
  min-height: 2.5rem;
  user-select: all;
}
.vocab-card__word-space { width: 10px; }

/* phase7 reveal 후 span 하나 */
.vocab-card__word-revealed {
  font-size: 2rem;
  font-weight: 500;
  line-height: 2.5rem;
  color: var(--c-text);
  user-select: all;
}

/* 글자 wrap */
.vocab-card__word-char {
  position: relative;
  width: 22px;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 글자 */
.vocab-card__letter {
  font-size: 1.8rem;
  font-weight: 500;
  line-height: 1;
  color: var(--c-text);
  position: absolute;
  opacity: 0;
  transition: opacity var(--reveal-dur) ease, color 0.1s ease;
}
.vocab-card__letter.is-visible   { opacity: 1; }
.vocab-card__letter.is-highlight { color: var(--c-highlight); }
.vocab-card__letter.is-final     { color: var(--c-highlight); }

/* 빈칸 밑줄 */
.vocab-card__blank {
  position: absolute;
  bottom: 6px;
  left: 1px;
  right: 1px;
  height: 2px;
  background: var(--c-blank);
  border-radius: 1px;
  opacity: 0;
  transition: opacity var(--reveal-dur) ease;
}
.vocab-card__blank.is-visible { opacity: 1; }

/* ── 뜻 ─────────────────────────────────────────────────────── */
.vocab-card__meaning {
  font-size: 1rem;
  color: var(--c-muted);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity var(--reveal-dur) ease, transform var(--reveal-dur) ease;
}
.vocab-card__meaning.is-visible { opacity: 1; transform: translateY(0); }

/* ── 예문 (카드용) ──────────────────────────────────────────── */
.vocab-card__example-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35em;
  align-items: baseline;
  border-left: 2px solid var(--c-accent);
  padding-left: 0.75rem;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity var(--example-dur) ease, transform var(--example-dur) ease;
}
.vocab-card__example-wrap.is-visible { opacity: 1; transform: translateY(0); }

.vocab-card__chunk {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--c-text);
  transition: color 0.1s ease;
}
.vocab-card__chunk.is-highlight { color: var(--c-highlight); }
.vocab-card__chunk.is-final {
  color: var(--c-highlight);
}

/* ── 반응형 ─────────────────────────────────────────────────── */
@media (min-width: 480px) {
  .vocab-card { flex-direction: row; align-items: flex-start; }
  .vocab-card__media-wrap { flex: 0 0 260px; aspect-ratio: 4 / 3; }
  .vocab-card__info { flex: 1; padding-top: 0.25rem; }
}

/* ================================================================
   풀스크린 레이어
   ================================================================ */

.vocab-fs {
  position: fixed;
  inset: 0;
  z-index: 3;
  opacity: 0;
  pointer-events: none;
}
.vocab-fs.is-active {
  opacity: 1;
  pointer-events: auto;
}

/* 풀스크린 활성화 시 카드 v1 영역 숨김 */
.vocab-card.is-fs-open > .vocab-card__media-wrap,
.vocab-card.is-fs-open > .vocab-card__info {
  visibility: hidden;
}

.vocab-fs__img {
  position: fixed;
  object-fit: cover;
  object-position: center center;
  transform-origin: 50% 50%;
  will-change: transform;
  transition: opacity 200ms ease;
}

/* 확대 완료 후 표시되는 고정 배경 — 부모(.vocab-fs) 꽉 채움 */
.vocab-fs__bg {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  object-fit: cover;
  object-position: center center;
  opacity: 0;
  transition: opacity 200ms ease;
}
.vocab-fs__bg.is-visible { opacity: 1; }

.vocab-fs__blur {
  position: absolute;
  inset: 0;
  backdrop-filter: blur(20px) brightness(0.55);
  -webkit-backdrop-filter: blur(20px) brightness(0.55);
  background: rgba(0,0,0,0.3);
  opacity: 0;
  transition: opacity var(--fs-blur-dur) ease;
}
.vocab-fs__blur.is-visible { opacity: 1; }

/* ── 풀스크린 텍스트 레이어 ─────────────────────────────────── */
/* 단어·뜻·예문이 각각 독립적으로 수직 중앙에 위치
   opacity:0 상태에서도 자리를 차지하지 않도록 position:absolute 처리 */
.vocab-fs__text {
  position: absolute;
  inset: 0;
  z-index: 1;
}

.vocab-fs__pos {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, calc(-50% - 3.5rem));
  font-size: 0.85rem;
  font-style: italic;
  color: var(--c-fs-muted);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.vocab-fs__word-row {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  gap: 0;              /* 문자 간격 없앰 */
  opacity: 0;
  transition: opacity var(--fs-fade-dur) ease;
  white-space: nowrap;
}
.vocab-fs__word-row.is-visible {
  opacity: 1;
}

/* 2. 풀스크린 띄어쓰기 공간 */
.vocab-fs__word-space { display: inline-block; width: 0.4em; flex-shrink: 0; min-width: 12px; }

.vocab-fs__letter {
  font-size: clamp(2.2rem, 7vw, 4rem);  /* 처음 크기로 복원 */
  font-weight: 600;
  color: var(--c-fs-text);
  letter-spacing: 0;
  transition: color 0.1s ease;
}
.vocab-fs__letter.is-highlight { color: var(--c-fs-hl); }

.vocab-fs__meaning {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 90%;
  font-size: clamp(2rem, 6vw, 3.2rem);
  font-weight: 800;
  color: var(--c-fs-text);
  text-align: center;
  opacity: 0;
  transition: opacity var(--fs-fade-dur) ease;
}
.vocab-fs__meaning.is-visible {
  opacity: 1;
}

.vocab-fs__example-wrap {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 90%;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5em;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--fs-fade-dur) ease;
}
.vocab-fs__example-wrap.is-visible {
  opacity: 1;
}

.vocab-fs__chunk {
  font-size: clamp(1.6rem, 5vw, 3rem);
  color: var(--c-fs-text);
  transition: color 0.1s ease;
}
.vocab-fs__chunk.is-highlight { color: var(--c-fs-hl); }

/* ================================================================
   네비게이션 버튼
   ================================================================ */

/* ── 시작 버튼 ──────────────────────────────────────────────── */
#vocab-start-wrap {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
}

/* ── 카드 + 이전/다음 버튼 레이아웃 ────────────────────────── */
#vocab-layout {
  display: flex;
  align-items: center;
  gap: 1rem;
  width: 100%;
  max-width: 780px;
  visibility: hidden;       /* 시작 전 숨김 */
}

/* ── 이전/다음 버튼 ─────────────────────────────────────────── */
.nav-btn {
  flex-shrink: 0;
  padding: 0.75rem 1.25rem;
  font-size: 1rem;
  font-family: 'Georgia', serif;
  color: var(--c-muted);
  background: transparent;
  border: 1.5px solid var(--c-muted);
  border-radius: 999px;
  cursor: pointer;
  letter-spacing: 0.04em;
  white-space: nowrap;
  transition: background 0.15s ease, color 0.15s ease;
}
.nav-btn:hover {
  background: var(--c-muted);
  color: #ffffff;
}

/* ── 처음으로 버튼 ──────────────────────────────────────────── */
/* vocab-layout 바로 아래에 항상 붙음
   position:absolute 라 display 변경 시 카드 레이아웃 밀지 않음 */
/* 처음으로 버튼 — body flex 흐름으로 카드 바로 아래에 위치
   min-height 로 항상 자리를 차지해 카드가 밀려 올라가지 않음 */
#vocab-restart-wrap {
  display: flex;            /* 항상 flex — visibility로 숨김/표시 */
  visibility: hidden;       /* 기본 숨김 */
  justify-content: center;
  width: 100%;
  max-width: 780px;
  padding-top: 1rem;
}
#vocab-restart-wrap.is-visible {
  visibility: visible;
}

#btn-restart {
  padding: 0.75rem 2.5rem;
  font-size: 1rem;
  font-family: 'Georgia', serif;
  color: var(--c-accent);
  background: transparent;
  border: 1.5px solid var(--c-accent);
  border-radius: 999px;
  cursor: pointer;
  letter-spacing: 0.04em;
  white-space: nowrap;
  transition: background 0.15s ease, color 0.15s ease;
}
#btn-restart:hover {
  background: var(--c-accent);
  color: #ffffff;
}

/* ── 자동재생 토글 버튼 ─────────────────────────────────────── */
#vocab-autoplay-wrap {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 4;
  visibility: hidden;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.autoplay-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3rem 0.4rem;
  font-size: 0.85rem;
  font-family: 'Georgia', serif;
  font-weight: 700;
  border: none;
  background: transparent;
  cursor: pointer;
  letter-spacing: 0.03em;
  transition: color 0.15s ease;
}

.autoplay-label {
  transition: color 0.15s ease;
}

/* 토글 트랙 */
.autoplay-track {
  position: relative;
  width: 2.6rem;
  height: 1.4rem;
  border-radius: 999px;
  background: var(--c-blank);
  transition: background 0.25s ease;
  flex-shrink: 0;
}

/* 토글 썸 (동그라미) */
.autoplay-thumb {
  position: absolute;
  top: 0.15rem;
  left: 0.15rem;
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 1px 3px rgba(0,0,0,0.25);
  transition: transform 0.25s ease;
}

/* ON 상태 — 초록 */
.autoplay-btn.is-on .autoplay-label { color: var(--c-accent); }
.autoplay-btn.is-on .autoplay-track  { background: var(--c-accent); }
.autoplay-btn.is-on .autoplay-thumb  { transform: translateX(1.2rem); }

/* OFF 상태 — 회색 */
.autoplay-btn.is-off .autoplay-label { color: var(--c-muted); }
.autoplay-btn.is-off .autoplay-track  { background: var(--c-blank); }
.autoplay-btn.is-off .autoplay-thumb  { transform: translateX(0); }

/* ── 도움말 버튼 ────────────────────────────────────────────── */
.help-btn {
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 50%;
  border: 1.5px solid var(--c-muted);
  background: transparent;
  color: var(--c-muted);
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  line-height: 1;
  flex-shrink: 0;
  transition: border-color 0.15s, color 0.15s;
}
.help-btn:hover {
  border-color: var(--c-text);
  color: var(--c-text);
}

/* ── 도움말 모달 ────────────────────────────────────────────── */
.help-modal {
  position: fixed;
  inset: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.35);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.help-modal[hidden] { display: none; }

.help-modal__box {
  background: var(--c-surface);
  border-radius: var(--radius-card);
  padding: 2rem;
  max-width: 320px;
  width: 90%;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  box-shadow: 0 8px 32px rgba(0,0,0,0.18);
}

.help-modal__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-text);
}

.help-modal__desc {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--c-muted);
}

.help-modal__desc strong {
  color: var(--c-text);
  font-weight: 700;
}

.help-modal__close {
  align-self: flex-end;
  padding: 0.5rem 1.5rem;
  font-size: 0.88rem;
  font-family: 'Georgia', serif;
  color: var(--c-accent);
  background: transparent;
  border: 1.5px solid var(--c-accent);
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.help-modal__close:hover {
  background: var(--c-accent);
  color: #ffffff;
}