/* =========================================================================
   N2 앱 화면 스타일
   - 크기 단위 --u = 참고 이미지(frontend example.jpg, 폭 648px)의 1px
     → 수치는 docs/implementation_plan.md 부록 A 를 그대로 옮김
   - 화면 폭이 넓어도 480px 까지만 (가운데 정렬)
   ========================================================================= */

/* 글꼴: app/fonts/ 에 직접 넣음 (인터넷 없이도 나오도록). 다시 만들기: python tools/make_fonts.py */
/* 한국어: G마켓 산스 Medium */
@font-face {
  font-family: 'GmarketSans';
  src: url('../fonts/GmarketSansMedium.woff2') format('woff2');
  font-weight: 500;
  font-display: swap;
}
/* 일본어: Noto Serif JP — 600 = 칸지(JIS 한자 전부), 500 = 읽기(가나·기호만) */
@font-face {
  font-family: 'Noto Serif JP';
  src: url('../fonts/NotoSerifJP-SemiBold.woff2') format('woff2');
  font-weight: 600 900;
  font-display: swap;
}
@font-face {
  font-family: 'Noto Serif JP';
  src: url('../fonts/NotoSerifJP-Medium.woff2') format('woff2');
  font-weight: 100 500;
  font-display: swap;
}

:root {
  --w: min(100vw, 480px);
  --u: calc(var(--w) / 648);

  --bg: #1C1C1E;
  --bar: #295A5F;
  --bar-line: #0D2225;
  --kanji: #27A3AD;
  --btn: #0E5C60;
  --btn-shadow: #0F555D;
  --study-text: #798158;
  --know-text: #819393;
  --meaning-btn: #282828;
  --meaning-text: #8E8E8E;
  --icon-on: #0098A0;
  --icon-off: #EEEBE2;
  --book: #0098A0;
  --spine: #3A6F74;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; background: #111; }
body {
  color: #fff;
  font-family: 'GmarketSans', system-ui, sans-serif;
  -webkit-tap-highlight-color: transparent;
  -webkit-user-select: none;
  user-select: none;
  overscroll-behavior: none;
}
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
svg { width: 100%; height: 100%; display: block; }
.jp { font-family: 'Noto Serif JP', serif; }

#app {
  position: relative;
  width: var(--w);
  height: 100dvh;
  margin: 0 auto;
  background: var(--bg);
  overflow: hidden;
}
.screen { height: 100%; display: flex; flex-direction: column; }
.scroll { flex: 1; overflow-y: auto; -webkit-overflow-scrolling: touch; padding-bottom: env(safe-area-inset-bottom); }

/* ---------- 상단 바 ---------- */
.topbar {
  flex: none;
  height: calc(188 * var(--u));
  padding-top: env(safe-area-inset-top);
  background: var(--bar);
  border-bottom: calc(4 * var(--u)) solid var(--bar-line);
  display: flex; align-items: center; justify-content: space-between;
  padding-left: calc(24 * var(--u)); padding-right: calc(24 * var(--u));
}
.topbar.small { height: calc(130 * var(--u)); }
.topbar .title { flex: 1; text-align: center; font-size: calc(34 * var(--u)); line-height: 1.5; }
.topbar .title .sub { color: #bfe; font-size: .8em; }
.topbar .side { width: calc(64 * var(--u)); height: calc(64 * var(--u)); padding: calc(10 * var(--u)); color: #fff; }
.timebar {
  flex: none;
  position: relative;
  height: calc(98 * var(--u));
  background: var(--bar);
  display: flex; align-items: center; justify-content: center;
  font-size: calc(29 * var(--u));
}
.timebar .gear {
  position: absolute; right: calc(24 * var(--u)); top: 50%; transform: translateY(-50%);
  width: calc(64 * var(--u)); height: calc(64 * var(--u)); padding: calc(12 * var(--u));
}

/* ---------- 학습 화면 ---------- */
.icons { flex: none; display: flex; justify-content: center; gap: calc(14 * var(--u)); margin-top: calc(20 * var(--u)); }
.icon {
  width: calc(70 * var(--u)); height: calc(70 * var(--u)); border-radius: 50%;
  background: var(--icon-off); color: #000;
  display: flex; align-items: center; justify-content: center;
  padding: calc(16 * var(--u));
  font-size: calc(36 * var(--u)); font-weight: 600; line-height: 1;
}
.icon.size { padding: 0; }
.icon.on { background: var(--icon-on); color: #fff; }
.icon:active { transform: scale(.92); }

.card { flex: 1; position: relative; min-height: calc(260 * var(--u)); }
.kwrap {
  position: absolute; left: 50%; top: 28%;
  transform: translate(-50%, -50%);
  text-align: center;
}
.kanji { color: var(--kanji); font-weight: 600; line-height: 1.2; white-space: nowrap; }
.kanji.big { font-size: min(calc(var(--w) * .16), calc(var(--w) * .8 / var(--len, 1))); }
.kanji.small { font-size: calc(var(--w) * .05); }
.reading, .meaning {
  position: absolute; left: 50%; transform: translateX(-50%);
  width: calc(var(--w) * .92);
  color: #fff; font-size: calc(var(--w) * .06);
  visibility: hidden;
}
.reading { bottom: 100%; margin-bottom: calc(16 * var(--u)); font-weight: 500; white-space: nowrap; }
.meaning { top: 100%; margin-top: calc(22 * var(--u)); line-height: 1.4; word-break: keep-all; }
.screen.answer .reading, .screen.answer .meaning { visibility: visible; }
.empty-msg { display: none; position: absolute; inset: 0; align-items: center; justify-content: center; text-align: center; color: #9a9a9a; font-size: calc(30 * var(--u)); line-height: 1.7; }
.screen.no-card .kwrap { display: none; }
.screen.no-card .empty-msg { display: flex; }
.screen.no-card .btns .btn { opacity: .45; pointer-events: none; }

.btns { flex: none; padding: 0 calc(28 * var(--u)) calc(70 * var(--u) + env(safe-area-inset-bottom)); }
.btn {
  border-radius: 999px;
  display: flex; align-items: center; justify-content: center;
  transition: transform .06s, box-shadow .06s;
}
.btn-meaning {
  width: 100%; height: calc(155 * var(--u));
  background: var(--meaning-btn); color: var(--meaning-text);
  font-size: calc(38 * var(--u));
  box-shadow: 0 calc(15 * var(--u)) 0 #141414;
  margin-bottom: calc(40 * var(--u));
}
.screen.answer .btn-meaning { visibility: hidden; }
.row2 { display: flex; gap: calc(22 * var(--u)); }
.btn-study, .btn-know {
  flex: 1; height: calc(150 * var(--u));
  background: var(--btn);
  box-shadow: 0 calc(15 * var(--u)) 0 var(--btn-shadow);
  font-size: calc(34 * var(--u));
}
.btn-study { color: var(--study-text); }
.btn-know { color: var(--know-text); }
.btn:active { transform: translateY(calc(10 * var(--u))); box-shadow: 0 calc(5 * var(--u)) 0 #111; }
.btn-study .cnt {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: calc(44 * var(--u)); height: calc(44 * var(--u)); padding: 0 calc(6 * var(--u));
  border: calc(3 * var(--u)) solid currentColor; border-radius: 999px;
  font-size: calc(24 * var(--u)); margin-right: calc(10 * var(--u));
}
.btn-know .chk { margin-right: calc(10 * var(--u)); }

/* ---------- 첫 화면 (상위 폴더 책 표지 선택: frontend example_4, 5) ---------- */
.home-top {
  flex: none;
  padding-top: var(--safe-top);
  height: calc(100 * var(--u) + var(--safe-top));
  display: flex; align-items: center; justify-content: flex-end;
  padding-right: calc(20 * var(--u));
}
.home-refresh {
  width: calc(80 * var(--u)); height: calc(80 * var(--u));
  padding: calc(18 * var(--u)); color: #8a8a8a; border-radius: 50%;
}
.home-refresh:active { color: #fff; background: rgba(255, 255, 255, .08); }
.home-main {
  flex: 1;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding-bottom: calc(20 * var(--u));
}
.top-book {
  width: calc(366 * var(--u)); height: calc(456 * var(--u));
  display: flex; overflow: hidden;
  background: #0098A0;
  border-radius: calc(22 * var(--u));
  box-shadow: 0 calc(10 * var(--u)) calc(24 * var(--u)) rgba(0, 0, 0, .28);
  transition: transform .08s;
}
.top-book:active { transform: scale(.97); }
.top-spine {
  width: calc(97 * var(--u)); flex: none;
  background: #377077;
}
.top-cover {
  flex: 1; min-width: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: calc(22 * var(--u));
  padding: 0 calc(20 * var(--u));
}
.top-title {
  color: #fff; font-weight: 700; line-height: 1.05;
  font-size: calc(min(86, 220 / max(2, var(--tlen, 2))) * var(--u));
  word-break: keep-all; text-align: center;
}
.top-count {
  color: #3E4746; font-weight: 700;
  font-size: calc(34 * var(--u)); line-height: 1;
}
.top-dots {
  display: flex; align-items: center; justify-content: center;
  gap: calc(24 * var(--u));
  margin-top: calc(30 * var(--u));
  flex-wrap: wrap;
}
.top-dot {
  width: calc(32 * var(--u)); height: calc(32 * var(--u));
  border-radius: 50%; background: #2A2A2C;
  transition: background .15s, transform .15s;
}
.top-dot.active { background: #8B8B8B; }
.home-foot {
  flex: none;
  display: flex; align-items: center; justify-content: center;
  padding: calc(16 * var(--u)) 0 calc(48 * var(--u));
}
.home-set-btn {
  display: inline-flex; align-items: center; gap: calc(12 * var(--u));
  color: #fff; font-size: calc(26 * var(--u));
  padding: calc(14 * var(--u)) calc(28 * var(--u));
  border-radius: 999px;
}
.home-set-btn:active { background: rgba(255, 255, 255, .08); }
.home-set-btn svg { width: calc(34 * var(--u)); height: calc(34 * var(--u)); }

/* ---------- 장(Chapter) 목록 ---------- */
.list-main { padding-top: calc(50 * var(--u)); }
.book-row {
  display: flex; align-items: center; justify-content: center;
  gap: calc(28 * var(--u));
  padding-left: calc(84 * var(--u) + 28 * var(--u)); /* 책이 화면 가운데 오도록 오른쪽 버튼만큼 */
  margin-bottom: calc(56 * var(--u));
}
.book {
  position: relative; overflow: hidden;
  width: calc(var(--w) * .4); height: calc(var(--w) * .52);
  display: flex;
  background: var(--book);
  border-radius: calc(6 * var(--u)) calc(16 * var(--u)) calc(16 * var(--u)) calc(6 * var(--u));
  box-shadow: 0 calc(10 * var(--u)) 0 #0B3D40;
  transition: transform .06s;
}
.book:active { transform: translateY(calc(6 * var(--u))); }
.spine { width: 25%; background: var(--spine); box-shadow: inset calc(-4 * var(--u)) 0 0 rgba(0, 0, 0, .15); }
.book-body { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: calc(12 * var(--u)); }
.b-top { font-size: calc(44 * var(--u)); font-weight: 700; line-height: 1; }
.book.fav .b-top { width: calc(54 * var(--u)); height: calc(54 * var(--u)); color: #FFE27A; }
.b-title { font-size: calc(40 * var(--u)); font-weight: 600; }
.book.fav .b-title { font-family: 'GmarketSans', sans-serif; font-weight: 500; font-size: calc(34 * var(--u)); }
.b-round { font-size: calc(34 * var(--u)); font-weight: 700; color: var(--bar-line); }
.b-sub { font-size: calc(24 * var(--u)); }
.ribbon {
  position: absolute; top: calc(22 * var(--u)); right: calc(-66 * var(--u));
  width: calc(210 * var(--u)); transform: rotate(45deg);
  background: #C8C8C8; color: #555; text-align: center;
  font-size: calc(20 * var(--u)); padding: calc(5 * var(--u)) 0;
}
.list-btn {
  width: calc(84 * var(--u)); height: calc(84 * var(--u));
  background: var(--book); border: calc(4 * var(--u)) solid #fff; border-radius: calc(12 * var(--u));
  padding: calc(14 * var(--u)); color: #fff;
}
.list-btn:active { transform: scale(.94); }
.list-info { text-align: center; color: #8a8a8a; font-size: calc(24 * var(--u)); margin: calc(10 * var(--u)) calc(30 * var(--u)) calc(60 * var(--u)); line-height: 1.6; }
.spin svg { animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- 단어 목록 ---------- */
.wlist { list-style: none; }
.wrow { display: flex; align-items: center; gap: calc(20 * var(--u)); padding: calc(24 * var(--u)) calc(30 * var(--u)); border-bottom: 1px solid #2C2C2E; }
.w-no { width: calc(64 * var(--u)); flex: none; color: #777; font-size: calc(24 * var(--u)); text-align: right; }
.w-main { flex: 1; display: flex; flex-direction: column; gap: calc(6 * var(--u)); min-width: 0; }
.w-word { color: var(--kanji); font-size: calc(44 * var(--u)); font-weight: 600; }
.w-reading { color: #fff; font-size: calc(28 * var(--u)); font-weight: 500; }
.w-reading:empty { display: none; }
.w-meaning { color: #d8d8d8; font-size: calc(28 * var(--u)); line-height: 1.4; }
.w-star {
  flex: none; width: calc(64 * var(--u)); height: calc(64 * var(--u)); border-radius: 50%;
  padding: calc(15 * var(--u)); background: #3A3A3C; color: #8a8a8a;
}
.w-star.on { background: var(--icon-on); color: #fff; }

/* ---------- 세팅 ---------- */
.settings section { padding: calc(36 * var(--u)) calc(36 * var(--u)) calc(10 * var(--u)); border-bottom: calc(10 * var(--u)) solid #151517; }
.settings h2 { color: var(--kanji); font-size: calc(30 * var(--u)); font-weight: 500; margin-bottom: calc(20 * var(--u)); }
.set-row { display: flex; align-items: center; justify-content: space-between; gap: calc(20 * var(--u)); padding: calc(18 * var(--u)) 0 calc(24 * var(--u)); }
.set-row + .set-row { border-top: 1px solid #2C2C2E; }
.set-label b { display: block; font-weight: 500; font-size: calc(30 * var(--u)); }
.set-label small { display: block; color: #9a9a9a; font-size: calc(24 * var(--u)); line-height: 1.5; margin-top: calc(6 * var(--u)); }
.sbtn { flex: none; background: var(--bar); border-radius: 999px; font-size: calc(26 * var(--u)); padding: calc(16 * var(--u)) calc(30 * var(--u)); }
.sbtn:active, .seg button:active, .mbtn:active { filter: brightness(1.2); }
.seg { display: flex; gap: calc(16 * var(--u)); margin-bottom: calc(20 * var(--u)); }
.seg button { flex: 1; background: #2C2C2E; color: #ccc; border-radius: 999px; padding: calc(24 * var(--u)) 0; font-size: calc(28 * var(--u)); }
.seg button.on { background: var(--icon-on); color: #fff; }
.hint { color: #8a8a8a; font-size: calc(24 * var(--u)); line-height: 1.6; margin-bottom: calc(20 * var(--u)); }
.app-ver { text-align: center; color: #666; font-size: calc(22 * var(--u)); padding: calc(40 * var(--u)) 0 calc(60 * var(--u)); }

/* ---------- 회독 완료 ---------- */
.done { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: calc(26 * var(--u)); padding: calc(40 * var(--u)); text-align: center; }
.done-emoji { font-size: calc(150 * var(--u)); line-height: 1; }
.done-title { font-size: calc(60 * var(--u)); color: var(--kanji); }
.done-folder { font-size: calc(32 * var(--u)); color: #ccc; }
.done-round { font-size: calc(44 * var(--u)); display: flex; align-items: center; gap: calc(24 * var(--u)); }
.done-round .old { color: #777; }
.done-round .arrow { color: #777; }
.done-round .new { color: #fff; font-size: 1.25em; }
.done-stats { display: flex; gap: calc(20 * var(--u)); margin: calc(20 * var(--u)) 0; }
.done-stats div { background: #2A2A2C; border-radius: calc(24 * var(--u)); padding: calc(24 * var(--u)) calc(34 * var(--u)); display: flex; flex-direction: column; gap: calc(10 * var(--u)); }
.done-stats span { color: #9a9a9a; font-size: calc(24 * var(--u)); }
.done-stats b { font-weight: 500; font-size: calc(32 * var(--u)); }
.done-btns { display: flex; flex-direction: column; gap: calc(24 * var(--u)); width: 80%; margin-top: calc(20 * var(--u)); }

/* ---------- 알림창 / 안내 / 메뉴 공통 ---------- */
.mbtn { background: #3A3A3C; color: #fff; border-radius: 999px; font-size: calc(30 * var(--u)); padding: calc(24 * var(--u)) calc(30 * var(--u)); }
.mbtn.primary { background: var(--icon-on); }
.mbtn.big { padding: calc(30 * var(--u)); font-size: calc(32 * var(--u)); }
.center-msg { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: calc(36 * var(--u)); color: #aaa; text-align: center; font-size: calc(30 * var(--u)); line-height: 1.7; padding: calc(40 * var(--u)); }

.modal-back { position: absolute; inset: 0; z-index: 50; background: rgba(0, 0, 0, .6); display: flex; align-items: center; justify-content: center; animation: fade .15s; }
.modal { width: 84%; background: #2A2A2C; border-radius: calc(32 * var(--u)); padding: calc(48 * var(--u)) calc(36 * var(--u)) calc(32 * var(--u)); text-align: center; }
.modal-title { font-size: calc(38 * var(--u)); margin-bottom: calc(20 * var(--u)); }
.modal-text { font-size: calc(30 * var(--u)); color: #ddd; line-height: 1.6; margin-bottom: calc(36 * var(--u)); }
.modal-btns { display: flex; gap: calc(20 * var(--u)); }
.modal-btns .mbtn { flex: 1; }
@keyframes fade { from { opacity: 0; } }

.toast {
  position: absolute; left: 50%; bottom: calc(40 * var(--u) + env(safe-area-inset-bottom)); z-index: 60;
  transform: translate(-50%, 20px); opacity: 0; pointer-events: none;
  background: rgba(50, 50, 52, .96); color: #fff; border-radius: 999px;
  padding: calc(18 * var(--u)) calc(36 * var(--u)); font-size: calc(26 * var(--u)); white-space: nowrap;
  transition: opacity .2s, transform .2s;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

.drawer-back { position: absolute; inset: 0; z-index: 40; background: rgba(0, 0, 0, 0); transition: background .2s; }
.drawer-back.open { background: rgba(0, 0, 0, .5); }
.drawer {
  position: absolute; top: 0; bottom: 0; left: 0; width: 62%;
  background: #232325; transform: translateX(-100%); transition: transform .2s;
}
.drawer-back.open .drawer { transform: none; }
.drawer-head { height: calc(188 * var(--u)); padding: env(safe-area-inset-top) calc(40 * var(--u)) 0; background: var(--bar); display: flex; align-items: center; font-size: calc(48 * var(--u)); font-weight: 700; }
.drawer-item { width: 100%; display: flex; align-items: center; gap: calc(24 * var(--u)); padding: calc(36 * var(--u)) calc(40 * var(--u)); font-size: calc(32 * var(--u)); text-align: left; }
.drawer-item svg { width: calc(44 * var(--u)); height: calc(44 * var(--u)); }
.drawer-item:active { background: #2F2F31; }