/* ═══════════ 绘语 · 北欧绘本风 ═══════════ */
:root {
  --cream: #fbf3e4;
  --apricot: #ffd9a0;
  --peach: #f6a886;
  --sky: #a8cbe8;
  --moss: #a6bf8f;
  --berry: #d97a8e;
  --cocoa: #5b4a3a;
  --cocoa-2: #8a7666;
  --line: #e8dcc4;
  --round: "Yuanti SC", "YouYuan", "Segoe UI Rounded", "PingFang SC", "Microsoft YaHei", sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: var(--round);
  background: var(--cream);
  color: var(--cocoa);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
button { font-family: var(--round); cursor: pointer; }

/* ═══ 封面区 ═══ */
.cover { position: relative; text-align: center; padding: 54px 16px 10px; overflow: hidden; }
.cover-deco { position: absolute; inset: 0; pointer-events: none; }
.blob { position: absolute; border-radius: 46% 54% 60% 40% / 55% 45% 55% 45%; }
.b1 { width: 150px; height: 130px; background: var(--apricot); opacity: .55; left: -30px; top: 30px; }
.b2 { width: 110px; height: 96px;  background: var(--sky); opacity: .45; right: -18px; top: 60px; }
.b3 { width: 70px; height: 64px; background: var(--moss); opacity: .4; right: 120px; top: -14px; }
.cover h1 {
  font-size: 52px; letter-spacing: 20px; text-indent: 20px; font-weight: 800;
  color: var(--cocoa); position: relative;
}
.cover h1::after {
  content: ""; display: block; width: 88px; height: 10px; margin: 14px auto 0;
  background: var(--peach); border-radius: 6px;
}
.cover-sub { margin-top: 14px; font-size: 15px; color: var(--cocoa-2); letter-spacing: 4px; position: relative; }

/* 书架（换语言） */
.bookshelf { display: flex; justify-content: center; gap: 14px; margin: 30px auto 0; position: relative; }
.shelf-book {
  padding: 11px 26px; font-size: 15px; letter-spacing: 2px;
  border-radius: 20px 20px 14px 14px; border: 2.5px solid transparent;
  background: #fff; color: var(--cocoa);
  box-shadow: 0 4px 0 var(--line);
  transition: all .15s;
}
.shelf-book.on.en    { background: var(--peach); color: #fff; box-shadow: 0 4px 0 #d18a68; }
.shelf-book.on.ja    { background: var(--sky); color: #fff; box-shadow: 0 4px 0 #7fa8c8; }
.shelf-book.on.ko    { background: var(--moss); color: #fff; box-shadow: 0 4px 0 #82a06a; }
.shelf-book:hover { transform: translateY(-2px); }

/* ═══ 学习页 ═══ */
.page { max-width: 640px; margin: 0 auto; padding: 26px 18px 70px; }

/* 进度小旗 */
.flags { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }
.flag {
  display: flex; align-items: center; gap: 10px;
  background: #fff; border: 2.5px solid var(--line); border-radius: 16px;
  padding: 10px 18px;
}
.flag-dot { width: 14px; height: 14px; border-radius: 50%; }
.d1 { background: var(--apricot); } .d2 { background: var(--sky); } .d3 { background: var(--moss); }
.flag b { font-size: 20px; display: block; line-height: 1.1; }
.flag small { font-size: 11.5px; color: var(--cocoa-2); display: block; }

/* 闪卡 */
.card-zone { margin: 34px 0 10px; text-align: center; }
.flip-card {
  width: min(340px, 86vw); height: 240px; margin: 0 auto; cursor: pointer;
  perspective: 900px; -webkit-tap-highlight-color: transparent;
}
.flip-inner {
  position: relative; width: 100%; height: 100%;
  transform-style: preserve-3d; transition: transform .5s cubic-bezier(.35, 1.3, .5, 1);
}
.flip-card.flipped .flip-inner { transform: rotateY(180deg); }
.flip-face {
  position: absolute; inset: 0; backface-visibility: hidden;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px;
  border-radius: 28px; border: 3px solid var(--line);
}
.flip-face.front { background: #fff; box-shadow: 0 10px 0 var(--line); }
.flip-face.back  {
  background: var(--apricot); border-color: #ecc98d;
  box-shadow: 0 10px 0 #ecc98d; transform: rotateY(180deg);
}
.face-tag { font-size: 11.5px; color: var(--cocoa-2); letter-spacing: 3px; }
.word { font-size: 42px; font-weight: 800; letter-spacing: 1px; word-break: break-all; padding: 0 14px; }
.word.small { font-size: 30px; }
.reading { font-size: 16px; color: #a06d3c; }
.meaning { font-size: 22px; font-weight: 700; color: var(--cocoa); }
.card-hint { margin-top: 22px; font-size: 12.5px; color: var(--cocoa-2); letter-spacing: 2px; }

/* 三色纽扣 */
.buttons { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 26px; }
.soft-btn {
  border: none; border-radius: 22px; padding: 16px 8px 14px;
  display: flex; flex-direction: column; align-items: center; gap: 5px;
  transition: transform .15s, box-shadow .15s;
}
.soft-btn b { font-size: 16.5px; color: #fff; letter-spacing: 2px; }
.soft-btn small { font-size: 10.5px; color: rgba(255,255,255,.85); letter-spacing: 1px; }
.soft-btn.peach { background: var(--peach); box-shadow: 0 6px 0 #d18a68; }
.soft-btn.sky   { background: var(--sky);   box-shadow: 0 6px 0 #7fa8c8; }
.soft-btn.moss  { background: var(--moss);  box-shadow: 0 6px 0 #82a06a; }
.soft-btn:hover { transform: translateY(-3px); }
.soft-btn:active { transform: translateY(3px); box-shadow: 0 2px 0 rgba(0,0,0,.15); }

/* 口袋 */
.pocket { margin-top: 40px; background: #fff; border: 3px dashed var(--line); border-radius: 24px; padding: 18px 20px; }
.pocket-head { display: flex; align-items: center; justify-content: space-between; }
.pocket-head h2 { font-size: 16px; letter-spacing: 3px; }
.tuck-btn {
  font-size: 12.5px; padding: 7px 16px; border-radius: 999px;
  background: var(--moss); color: #fff; border: none;
}
.pocket-list { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 8px; }
.pocket-chip {
  font-size: 13px; background: var(--cream); border: 2px solid var(--line);
  border-radius: 999px; padding: 5px 14px; color: var(--cocoa);
}
.pocket-chip small { color: var(--cocoa-2); }

/* ═══ 响应式 ═══ */
@media (max-width: 560px) {
  .cover h1 { font-size: 38px; letter-spacing: 12px; text-indent: 12px; }
  .cover { padding-top: 38px; }
  .flip-card { height: 210px; }
  .word { font-size: 32px; }
  .word.small { font-size: 24px; }
  .buttons { grid-template-columns: 1fr; gap: 10px; }
  .soft-btn { flex-direction: row; justify-content: center; gap: 10px; padding: 13px; }
  .soft-btn small { display: none; }
}