/*
 * ═══════════════════════════════════════════════════════════════
 *  수석의방 — 펼친 책 UI 디자인 시스템
 *  suseok-book-design.css
 *
 *  사용법:
 *    <link rel="stylesheet" href="suseok-book-design.css">
 *    <link href="https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;600;700;900&display=swap" rel="stylesheet">
 *
 *  목차:
 *    1. 디자인 토큰 (CSS 변수)
 *    2. 리셋 & 베이스
 *    3. 애니메이션
 *    4. 표지 (Cover) — 필요 시 사용
 *    5. 펼친 책 레이아웃 (Book Shell)
 *    6. 헤더 (Spine)
 *    7. 페이지 & 구분선
 *    8. 콘텐츠 블록 & 타이포그래피
 *    9. 채팅 버블 & 입력창
 *   10. 버튼 시스템
 *   11. 추천 칩 & 네비게이션
 *   12. 단락 모드 (키워드 카드)
 *   13. 스토리 학습 UI
 *   14. 웰컴 패널 & 유틸리티
 *   15. 반응형 (Responsive)
 * ═══════════════════════════════════════════════════════════════
 */


/* ═══════════════════════════════════════════
   1. 디자인 토큰
═══════════════════════════════════════════ */
:root {
  /* 색상 */
  --navy:       #0d1b2a;
  --navy-mid:   #162438;
  --navy-deep:  #080f18;
  --gold:       #c8a96e;
  --gold-l:     #e8d5a8;
  --gold-d:     #a88a52;
  --cream:      #f5f0e8;
  --cream2:     #ede5d4;
  --cream-b:    #f9f6f1;
  --white:      #ffffff;
  --ink:        #141414;
  --mute:       #42372e;
  --soft:       #5e5044;
  --on-dark:    rgba(255, 255, 255, .88);
  --on-dark-s:  rgba(255, 255, 255, .60);
  --border:     rgba(200, 169, 110, .25);

  /* 추가 액센트 및 폰트 색상 변수 */
  --accent:       #7a5c1e;
  --accent-warm:  #7a5c1e;
  --accent-glow:  rgba(122, 92, 30, 0.06);
  --ink-light:    #5e5044;
  --ink-faint:    rgba(20, 20, 20, 0.38);
  --cover:        var(--navy);
  --paper:        var(--page-bg);

  /* 사회편 강조색 — 붉은 인장 */
  --red:        #b94040;
  --red-l:      #d4706a;
  --red-faint:  rgba(185, 64, 64, .08);

  /* 레이아웃 */
  --r:          4px;
  --page-bg:    #f9f6f1;
  --gutter-shadow: rgba(13, 27, 42, .12);

  /* (레거시 — 현재 미사용, 하위호환용) */
  --book-h:     min(calc(100dvh - 60px), 760px);
  --spine-w:    20px;
  
  /* 전역 폰트 하위호환 */
  --font-sans: 'Noto Sans KR', sans-serif;
  --font-serif: 'Noto Sans KR', sans-serif;
}


/* ═══════════════════════════════════════════
   2. 리셋 & 베이스
═══════════════════════════════════════════ */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  background: #f0ece4;
  background-image: linear-gradient(160deg, #f7f4ef 0%, #ece6db 60%, #e4ddd2 100%);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-family: 'Noto Sans KR', sans-serif;
  color: var(--ink);
  overflow-x: hidden;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

#root {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
}


/* ═══════════════════════════════════════════
   3. 애니메이션
═══════════════════════════════════════════ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px) scale(.98); }
  to   { opacity: 1; transform: none; }
}

@keyframes cfi {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: none; }
}

@keyframes db {
  0%, 60%, 100% { transform: translateY(0);   opacity: .3; }
  30%           { transform: translateY(-6px); opacity: 1; }
}

@keyframes float-icon {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-8px); }
}

@keyframes pulse-badge {
  0%, 100% { opacity: .7; }
  50%      { opacity: 1; }
}

@keyframes chevron-fade-down {
  0%   { opacity: 0;   transform: translateY(-4px); }
  30%  { opacity: 1;   transform: translateY(0); }
  60%  { opacity: 0.3; transform: translateY(2px); }
  100% { opacity: 0;   transform: translateY(4px); }
}


/* ═══════════════════════════════════════════
   4. 표지 (Cover) — 필요 시 사용
═══════════════════════════════════════════ */
.cover-scene {
  width: 100%;
  max-width: 520px;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeUp .55s cubic-bezier(.22, 1, .36, 1);
  padding: 32px 20px;
}

.cover-shell {
  width: 100%;
  background: var(--navy);
  border-radius: 20px;
  padding: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow:
    0 2px 8px rgba(13,27,42,.08),
    0 12px 40px rgba(13,27,42,.18),
    0 32px 80px rgba(13,27,42,.14);
}

/* 상단 골드 라인 — 책등 메타포 */
.cover-spine-el {
  width: 100%;
  flex: 0 0 auto;
  height: 6px;
  background: linear-gradient(90deg, var(--gold-d), var(--gold), var(--gold-d));
}

.cover-spine-el::after { display: none; }

.cover-face {
  flex: 1;
  background: transparent;
  padding: 44px 40px 36px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cover-face::before {
  content: '';
  position: absolute;
  inset: 20px;
  border: 1px solid rgba(200, 169, 110, .15);
  border-radius: 10px;
  pointer-events: none;
}

.cover-face::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.cover-face-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
}

.cover-orn {
  width: 40px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  margin-bottom: 20px;
  opacity: .8;
}

.cover-sub {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 10px;
  opacity: .7;
}

.cover-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 12px;
  line-height: 1.25;
  letter-spacing: -.02em;
}

.cover-desc {
  font-size: 13px;
  color: var(--on-dark-s);
  line-height: 1.8;
  margin-bottom: 28px;
  max-width: 220px;
}

.cover-desc strong {
  color: var(--gold-l);
  font-weight: 600;
}

.cover-icon {
  width: 72px;
  height: 72px;
  margin-bottom: 18px;
  filter: drop-shadow(0 4px 16px rgba(0,0,0,.5));
  border-radius: 50%;
  background-color: var(--white);
  padding: 6px;
  animation: float-icon 4s ease-in-out infinite;
}

/* 커버 검색창 */
.cover-search { width: 100%; position: relative; }

.cover-search-textarea {
  width: 100%;
  padding: 14px 56px 14px 20px;
  border: 1.5px solid rgba(200, 169, 110, .35);
  border-radius: 24px;
  background: rgba(255,255,255,.07);
  color: var(--white);
  font-family: 'Noto Sans KR', sans-serif;
  font-size: 14px;
  outline: none;
  transition: all .3s;
  resize: none;
  min-height: 54px;
  max-height: 160px;
  line-height: 1.6;
}

.cover-input {
  width: 100%;
  padding: 14px 52px 14px 20px;
  border: 1.5px solid rgba(200, 169, 110, .35);
  border-radius: 28px;
  background: rgba(255,255,255,.07);
  color: var(--white);
  font-family: 'Noto Sans KR', sans-serif;
  font-size: 14px;
  outline: none;
  transition: all .3s;
}

.cover-input::placeholder,
.cover-search-textarea::placeholder {
  color: rgba(200, 169, 110, .5);
}

.cover-input:focus,
.cover-search-textarea:focus {
  border-color: var(--gold);
  background: rgba(200, 169, 110, .07);
  box-shadow: 0 0 0 3px rgba(200, 169, 110, .12);
}

.cover-sbtn {
  position: absolute;
  right: 5px;
  top: 50%;
  transform: translateY(-50%);
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--gold);
  border: none;
  color: var(--navy);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .25s;
  box-shadow: 0 2px 10px rgba(200, 169, 110, .3);
}

.cover-sbtn:hover {
  background: var(--gold-l);
  transform: translateY(-50%) translateY(-1px);
}

.cover-ft {
  margin-top: 20px;
  font-size: 10px;
  letter-spacing: .12em;
  color: rgba(200, 169, 110, .25);
}

/* 커버 탭 */
.cover-mode-tabs { display: flex; gap: 8px; margin-bottom: 20px; width: 100%; }

.cover-mode-tab {
  flex: 1;
  padding: 9px 0;
  border-radius: 20px;
  border: 1.5px solid rgba(200, 169, 110, .3);
  background: transparent;
  color: rgba(200, 169, 110, .6);
  font-family: 'Noto Sans KR', sans-serif;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  letter-spacing: .04em;
}

.cover-mode-tab.active {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--navy);
}


/* ═══════════════════════════════════════════
   5. 펼친 책 레이아웃 (Book Shell)
═══════════════════════════════════════════ */
.bk-scene {
  width: 100%;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: stretch;
  animation: fadeUp .45s cubic-bezier(.22, 1, .36, 1);
}

.bk-shell {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  flex: 1;
  background: var(--navy);
  border-radius: 0;
  padding: 0;
  box-shadow: none;
}

.bk-pages {
  flex: 1;
  display: flex;
  background: var(--page-bg);
  overflow: hidden;
  position: relative;
  min-height: 0;
}

/* 중앙 가름선 — 책 펼침 느낌 */
.bk-gutter {
  position: absolute;
  top: 0; bottom: 0;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(200,169,110,.35) 8%,
    rgba(200,169,110,.35) 92%,
    transparent 100%
  );
  z-index: 2;
  pointer-events: none;
}

/* 가름선 좌우 그림자 */
.bk-gutter::before {
  content: '';
  position: absolute;
  top: 0; bottom: 0;
  left: -12px;
  width: 12px;
  background: linear-gradient(90deg, transparent, rgba(13,27,42,.04));
  pointer-events: none;
}

.bk-gutter::after {
  content: '';
  position: absolute;
  top: 0; bottom: 0;
  right: -12px;
  width: 12px;
  background: linear-gradient(270deg, transparent, rgba(13,27,42,.04));
  pointer-events: none;
}

.bk-edge { display: none; }
.bk-ft   { display: none; }


/* ═══════════════════════════════════════════
   6. 헤더 (Spine)
═══════════════════════════════════════════ */
.bk-spine {
  width: 100%;
  flex: 0 0 48px;
  min-height: 48px;
  background: var(--navy);
  display: flex;
  align-items: center;
  padding: 0 28px;
  gap: 12px;
  border-bottom: 2px solid var(--gold-d);
  position: relative;
}

/* 우측 저작권 텍스트 (::after 방식 비활성 — bk-spine-brand로 대체됨) */
.bk-spine::after { display: none; }

.bk-spine-title {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gold);
  opacity: .9;
}

.bk-spine-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(200,169,110,.4);
}

.bk-spine-brand {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .16em;
  color: rgba(200, 169, 110, .75);
}

/* 헤더 홈 버튼 (아이콘+타이틀 클릭 시 홈으로) */
.spine-home-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px 8px 4px 0;
  border-radius: 6px;
  transition: opacity .2s;
}

.spine-home-btn:hover { opacity: .75; }


/* ═══════════════════════════════════════════
   7. 페이지 & 구분선
═══════════════════════════════════════════ */
.pg {
  flex: 1;
  overflow-y: auto;
  padding: 28px 44px 28px;
  position: relative;
  min-height: 0;
}

.pg::-webkit-scrollbar        { width: 4px; }
.pg::-webkit-scrollbar-track  { background: transparent; }
.pg::-webkit-scrollbar-thumb  { background: var(--cream2); border-radius: 2px; }

/* 러닝 헤더 (페이지 상단 레이블) */
.rh {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--gold-d);
  opacity: .85;
  margin-bottom: 16px;
}

/* 황금 구분선 */
.hl {
  height: 1px;
  background: linear-gradient(90deg, rgba(200,169,110,.5) 0%, rgba(200,169,110,.2) 60%, transparent 100%);
  margin-bottom: 28px;
}

/* 단어 제목 (오른쪽 페이지 상단) */
.pg-word-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -.01em;
  margin-bottom: 18px;
}

/* 빵부스러기 네비게이션 */
.bc {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-items: center;
  margin-bottom: 16px;
}

.bc-c {
  font-size: 16px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 12px;
  cursor: pointer;
  transition: all .2s;
}

.bc-c.on  { background: var(--navy); color: var(--gold-l); cursor: default; }
.bc-c.off { background: var(--cream2); color: var(--soft); }
.bc-c.off:hover { background: var(--gold); color: var(--navy); }

.bc-s { color: var(--soft); font-size: 13px; opacity: .5; }


/* ═══════════════════════════════════════════
   8. 콘텐츠 블록 & 타이포그래피
═══════════════════════════════════════════ */

/* 섹션 레이블 */
.sl {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 700;
  color: var(--gold-d);
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.sl-n {
  width: 20px;
  height: 20px;
  border-radius: var(--r);
  background: var(--navy);
  color: var(--gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
}

/* 콘텐츠 블록 */
.cb {
  margin-bottom: 20px;
  animation: cfi .35s ease-out;
}

.cc {
  background: var(--white);
  border-radius: var(--r);
  padding: 20px 22px;
  border: 1px solid var(--cream2);
  box-shadow: 0 1px 3px rgba(13,27,42,.04), 0 4px 16px rgba(13,27,42,.03);
}

.intro-b {
  background: rgba(200, 169, 110, .07);
  border-left: 3px solid var(--gold);
  border-radius: 0 var(--r) var(--r) 0;
  padding: 14px 18px;
  font-size: 16px;
  line-height: 1.85;
  margin-bottom: 18px;
  color: var(--mute);
}

/* 붉은 강조 블록 */
.story-b {
  background: var(--red-faint);
  border-left: 3px solid var(--red);
  border-radius: 0 var(--r) var(--r) 0;
  padding: 14px 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mute);
}

.t-body {
  font-size: 18px;
  line-height: 1.95;
  margin-bottom: 14px;
  text-align: justify;
  word-break: keep-all;
  color: var(--mute);
}

.t-small {
  font-size: 16px;
  line-height: 1.75;
  color: var(--soft);
  margin-bottom: 12px;
}

/* AI 마크다운 렌더 */
.ai { word-break: keep-all; overflow-x: auto; }

.ai h1, .ai h2, .ai h3 {
  font-weight: 700;
  color: var(--navy);
  margin-top: .85em;
  margin-bottom: .4em;
}

.ai h1 {
  font-size: 21px;
  border-bottom: 1px solid var(--cream2);
  padding-bottom: .25em;
  color: var(--gold-d);
}

.ai h2 { font-size: 19px; color: var(--navy-mid); }
.ai h3 { font-size: 18px; }

.ai p {
  font-size: 18px;
  line-height: 1.95;
  margin-bottom: .75em;
  color: var(--mute);
}

.ai ul, .ai ol {
  margin-bottom: .75em;
  padding-left: 1.4em;
  font-size: 18px;
  line-height: 1.95;
  color: var(--mute);
}

.ai ul { list-style-type: disc; }
.ai ol { list-style-type: decimal; }

.ai strong, .ai b { font-weight: 700; color: var(--navy); }

.ai blockquote {
  border-left: 3px solid var(--gold);
  padding: 10px 16px;
  margin: .8em 0;
  color: var(--soft);
  font-style: italic;
  background: rgba(200, 169, 110, .06);
  border-radius: 0 var(--r) var(--r) 0;
}

.ai table {
  width: 100%;
  border-collapse: collapse;
  margin: .8em 0;
  font-size: 13px;
  border: 1px solid var(--cream2);
}

.ai th {
  background: var(--navy);
  color: var(--gold-l);
  padding: 9px 12px;
  font-weight: 600;
  font-size: 12px;
  border: 1px solid var(--navy-mid);
  text-align: center;
}

.ai td {
  padding: 8px 12px;
  border: 1px solid var(--cream2);
  line-height: 1.6;
  vertical-align: top;
  background: var(--white);
  color: var(--mute);
}

.ai td:first-child {
  font-weight: 600;
  color: var(--navy);
  background: var(--cream-b);
}

/* 추가 질문 섹션 */
.fu-sec {
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px dashed var(--cream2);
}

.fu-q {
  font-size: 15px;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 10px;
  padding: 10px 14px;
  background: rgba(200, 169, 110, .08);
  border-radius: var(--r);
  border-left: 3px solid var(--gold);
}

.fu-a { margin-bottom: 18px; }


/* ═══════════════════════════════════════════
   9. 채팅 버블 & 입력창
═══════════════════════════════════════════ */

/* 사용자 메시지 (오른쪽 정렬) */
.umsg {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 14px;
}

.ub {
  background: var(--navy);
  color: var(--on-dark);
  padding: 11px 18px;
  border-radius: 16px 16px 4px 16px;
  max-width: 85%;
  font-size: 17px;
  line-height: 1.65;
  word-break: keep-all;
}

/* AI 메시지 (왼쪽 정렬) */
.amb { margin-bottom: 14px; }

.ab {
  background: var(--white);
  border: 1px solid var(--cream2);
  padding: 14px 18px;
  border-radius: 16px 16px 16px 4px;
  box-shadow: 0 1px 4px rgba(13,27,42,.04);
  font-size: 17px;
  line-height: 1.8;
  color: var(--mute);
}

/* 로딩 점 */
.dots { display: flex; gap: 5px; padding: 10px 0; }

.dots span {
  display: inline-block;
  width: 7px;
  height: 7px;
  background: var(--gold-d);
  border-radius: 50%;
  animation: db 1.2s infinite;
}

.dots span:nth-child(2) { animation-delay: .15s; }
.dots span:nth-child(3) { animation-delay: .3s; }

/* 데스크탑 입력창 (좌측 페이지 하단 고정) */
.ib {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 10px 20px 12px;
  background: rgba(249, 246, 241, .97);
  backdrop-filter: blur(8px);
  border-top: 1px solid var(--cream2);
  display: flex;
  gap: 8px;
  z-index: 10;
}

.ib input {
  flex: 1;
  border: 1.5px solid var(--cream2);
  border-radius: 22px;
  padding: 10px 18px;
  font-family: 'Noto Sans KR', sans-serif;
  font-size: 17px;
  outline: none;
  background: var(--white);
  color: var(--ink);
  transition: border-color .2s;
}

.ib input:focus     { border-color: var(--gold); }
.ib input::placeholder { color: var(--soft); opacity: .6; }

.ib button {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: none;
  background: var(--navy);
  color: var(--gold);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .2s;
  box-shadow: 0 2px 8px rgba(13,27,42,.2);
}

.ib button:hover    { background: var(--gold); color: var(--navy); }
.ib button:disabled { opacity: .3; cursor: default; }

/* 모바일 입력바 (기본 숨김 — 반응형에서 표시) */
.mob-ib { display: none; }


/* ═══════════════════════════════════════════
   10. 버튼 시스템
═══════════════════════════════════════════ */

/* 주요 액션 버튼 (네이비 배경) */
.rbtn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 11px 24px;
  border: none;
  border-radius: 24px;
  background: var(--navy);
  color: var(--gold-l);
  font-family: 'Noto Sans KR', sans-serif;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all .25s;
  box-shadow: 0 2px 10px rgba(13,27,42,.2);
  letter-spacing: .02em;
}

.rbtn:hover  { background: var(--gold); color: var(--navy); transform: translateY(-1px); }
.rbtn:active { transform: scale(.95); }

/* 보조 버튼 (흰 배경) */
.pbtn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 11px 24px;
  border: 1.5px solid var(--cream2);
  border-radius: 24px;
  background: var(--white);
  color: var(--navy);
  font-family: 'Noto Sans KR', sans-serif;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all .25s;
}

.pbtn:hover    { border-color: var(--gold); color: var(--gold-d); }
.pbtn:disabled { opacity: .4; cursor: default; }

/* 스토리 제출 버튼 (레드) */
.story-submit-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 11px 24px;
  border: none;
  border-radius: 24px;
  background: var(--red);
  color: var(--white);
  font-family: 'Noto Sans KR', sans-serif;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: all .25s;
  margin-top: 10px;
}

.story-submit-btn:hover    { background: var(--red-l); transform: translateY(-1px); }
.story-submit-btn:disabled { opacity: .4; cursor: default; transform: none; }

/* 커버 액션 버튼 */
.cover-abtn {
  width: 100%;
  padding: 13px;
  border-radius: 28px;
  background: var(--gold);
  border: none;
  color: var(--navy);
  font-family: 'Noto Sans KR', sans-serif;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: all .25s;
  margin-top: 10px;
}

.cover-abtn:hover { background: var(--gold-l); }

/* 3단 하강 Chevron 애니메이션 */
.chevron-down-triple {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  line-height: 0.35;
  margin-right: 8px;
  vertical-align: middle;
  height: 16px;
  width: 12px;
}

.chevron-down-triple span {
  display: block;
  font-size: 12px;
  font-weight: 900;
  color: currentColor;
  animation: chevron-fade-down 1.2s infinite;
  opacity: 0;
}

.chevron-down-triple span:nth-child(1) { animation-delay: 0s; }
.chevron-down-triple span:nth-child(2) { animation-delay: 0.25s; margin-top: -2px; }
.chevron-down-triple span:nth-child(3) { animation-delay: 0.5s;  margin-top: -2px; }


/* ═══════════════════════════════════════════
   11. 추천 칩 & 네비게이션
═══════════════════════════════════════════ */
.rp {
  background: var(--white);
  border-radius: var(--r);
  padding: 20px 22px;
  border: 1px solid var(--cream2);
  box-shadow: 0 1px 3px rgba(13,27,42,.04);
  animation: cfi .35s ease-out;
  margin-top: 16px;
}

.rp-t {
  font-size: 15px;
  font-weight: 700;
  color: var(--soft);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 7px;
  letter-spacing: .04em;
}

.rp-chips { display: flex; flex-wrap: wrap; gap: 8px; }

.rp-c {
  padding: 8px 18px;
  border: 1.5px solid var(--gold);
  border-radius: 20px;
  background: rgba(200, 169, 110, .06);
  color: var(--gold-d);
  font-family: 'Noto Sans KR', sans-serif;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  letter-spacing: .02em;
}

.rp-c:hover { background: var(--gold); color: var(--navy); border-color: var(--gold); }

.rp-acts {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--cream2);
  justify-content: flex-end;
}

.rp-ab {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 7px 16px;
  border-radius: var(--r);
  border: none;
  font-family: 'Noto Sans KR', sans-serif;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  letter-spacing: .02em;
}

.rp-ab.bk { background: var(--cream2); color: var(--soft); }
.rp-ab.bk:hover { background: var(--cream); color: var(--navy); }

.rp-ab.hm { background: var(--navy); color: var(--gold-l); }
.rp-ab.hm:hover { background: var(--gold); color: var(--navy); }


/* ═══════════════════════════════════════════
   12. 단락 모드 (키워드 카드)
═══════════════════════════════════════════ */
.kw-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0;
}

.kw-card {
  padding: 8px 16px;
  border-radius: 20px;
  border: 1.5px solid var(--cream2);
  background: var(--white);
  font-size: 13px;
  font-weight: 600;
  color: var(--navy);
  cursor: pointer;
  transition: all .2s;
  position: relative;
}

.kw-card:hover { border-color: var(--gold); color: var(--gold-d); transform: translateY(-1px); }

.kw-card.done { background: var(--navy); color: var(--gold-l); border-color: var(--navy); }

.kw-card.done::after {
  content: '✓';
  position: absolute;
  top: -4px; right: -4px;
  width: 14px; height: 14px;
  background: var(--gold);
  border-radius: 50%;
  font-size: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--navy);
}

.kw-card.current {
  border-color: var(--gold);
  background: rgba(200, 169, 110, .1);
  color: var(--gold-d);
}

.kw-summary {
  background: rgba(200, 169, 110, .08);
  border: 1px solid rgba(200, 169, 110, .2);
  border-radius: var(--r);
  padding: 12px 16px;
  font-size: 13px;
  color: var(--mute);
  line-height: 1.7;
  margin-bottom: 14px;
}

.kw-era {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--red);
  background: var(--red-faint);
  padding: 3px 10px;
  border-radius: 10px;
  margin-bottom: 10px;
}


/* ═══════════════════════════════════════════
   13. 스토리 학습 UI
═══════════════════════════════════════════ */
.story-input-area {
  width: 100%;
  min-height: 90px;
  padding: 14px 16px;
  border: 1.5px solid var(--cream2);
  border-radius: var(--r);
  font-family: 'Noto Sans KR', sans-serif;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
  background: var(--white);
  resize: vertical;
  outline: none;
  transition: border-color .2s;
}

.story-input-area:focus {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(200, 169, 110, .1);
}

.story-input-area::placeholder { color: var(--soft); opacity: .6; }

.hint-keyword-pills { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0; }

.hint-kw-pill {
  padding: 5px 14px;
  border-radius: 16px;
  background: rgba(185, 64, 64, .1);
  border: 1px solid rgba(185, 64, 64, .25);
  font-size: 12px;
  font-weight: 600;
  color: var(--red);
}

/* Progress Bar */
.story-progress-container {
  margin-bottom: 16px;
  padding: 12px 14px;
  background: var(--white);
  border: 1.5px solid var(--cream2);
  border-radius: var(--r);
  box-shadow: 0 1px 3px rgba(13,27,42,.03);
}


/* ═══════════════════════════════════════════
   14. 웰컴 패널 & 유틸리티
═══════════════════════════════════════════ */
.welcome-panel {
  animation: cfi .4s ease-out;
  margin-bottom: 24px;
}


/* ═══════════════════════════════════════════
   15. 반응형 (Responsive)
═══════════════════════════════════════════ */
@media (max-width: 1024px) {
  .pg { padding: 32px 32px 20px; }
}

@media (max-width: 767px) {
  body { justify-content: flex-start; padding: 0; }

  #root { min-height: 100dvh; width: 100%; }

  /* 커버 모바일 */
  .cover-scene {
    max-width: 100%;
    padding: 16px;
    height: 100dvh;
    box-sizing: border-box;
    align-items: stretch;
  }

  .cover-shell { max-width: 100%; border-radius: 16px; flex: 1; }
  .cover-spine-el { width: 100%; height: 6px; flex: 0 0 6px; }
  .cover-face { border-radius: 0; flex: 1; min-height: 0; padding: 36px 24px 28px; }
  .cover-title { font-size: 22px; }
  .cover-icon  { width: 72px; height: 72px; margin-bottom: 18px; }
  .cover-desc  { font-size: 13px; margin-bottom: 20px; }

  /* 펼친 책 모바일 */
  .bk-scene { padding: 0; width: 100%; height: 100dvh; }
  .bk-shell { max-width: 100%; height: 100dvh; border-radius: 0; }
  .bk-spine { padding: 0 16px; }
  .bk-spine::after { display: none; }

  .bk-pages {
    flex: 1;
    flex-direction: column;
    border-radius: 0;
    min-height: 0;
    overflow: hidden;
  }

  .bk-gutter { display: none; }

  /* 데스크탑 전용 페이지 숨김 */
  .pg-l-dk,
  .pg-r-dk { display: none !important; }

  /* 모바일 단일 페이지 표시 */
  .pg-mob {
    display: flex !important;
    flex: 1;
    overflow-y: auto;
    padding: 20px 20px 24px;
  }

  /* 모바일 고정 입력 바 */
  .mob-ib {
    display: flex;
    flex: 0 0 auto;
    padding: 10px 16px calc(env(safe-area-inset-bottom, 10px) + 10px);
    background: rgba(249, 246, 241, .97);
    backdrop-filter: blur(8px);
    border-top: 1px solid var(--cream2);
    gap: 8px;
    z-index: 20;
    position: relative;
  }

  .mob-ib input {
    flex: 1;
    border: 1.5px solid var(--cream2);
    border-radius: 22px;
    padding: 10px 18px;
    font-family: 'Noto Sans KR', sans-serif;
    font-size: 17px;
    outline: none;
    background: var(--white);
    color: var(--ink);
  }

  .mob-ib input:focus { border-color: var(--gold); outline: none; }
  .mob-ib input::placeholder { color: var(--soft); opacity: .6; }

  .mob-ib button {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: var(--navy);
    color: var(--gold);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }

  .pg { padding: 20px 20px 16px; }
}

@media (min-width: 768px) {
  .pg-mob { display: none !important; }

  .pg-l-dk,
  .pg-r-dk { display: block !important; }

  /* 전체 화면 확장 */
  .book-aspect {
    flex: 1 !important;
    max-width: none !important;
    aspect-ratio: unset !important;
  }
}

/* Page number & mobile navigator integration */
.page-num {
  position: absolute;
  bottom: 12px;
  font-size: 13px;
  color: var(--soft);
  opacity: 0.6;
  pointer-events: none;
}
.pg-l-dk .page-num, .pg-mob .page-num {
  left: 20px;
}
.pg-r-dk .page-num {
  right: 20px;
}

.mob-nav {
  position: absolute;
  bottom: 28px;
  width: 32px;
  height: 32px;
  border: none;
  background: var(--navy);
  color: var(--gold);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  border-radius: 50%;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 50;
  box-shadow: 0 2px 8px rgba(13,27,42,.2);
  transition: all 0.2s;
}
.mob-nav:hover {
  background: var(--gold);
  color: var(--navy);
}
@media (max-width: 767px) {
  .mob-nav {
    display: flex;
  }
  .mob-nav-l {
    left: 16px;
  }
  .mob-nav-r {
    right: 16px;
  }
}