/* =========================================================
   数学小星球 v2.0 · 设计 Token（方案 6.2）
   天空蓝主色 + 贴纸描边 + 手绘圆角，浅色主题
   ========================================================= */
:root {
  --c-primary: #3E8FCB;
  --c-primary-l: #EAF6FF;
  --c-primary-b: #BFE0F5;
  --bg-sky-1: #CCE8FF;
  --bg-sky-2: #EAF6FF;

  --c-mint: #3B9B7B;
  --c-mint-l: #D6F0E6;
  --c-sky: #2E6E9E;
  --c-gold: #BE8F32;
  --c-gold-l: #FBF4E3;
  --c-coral: #D2604B;

  --c-ink: #2F4858;
  --c-ink2: #5E7387;
  --c-ink3: #93A5B5;

  --fs-stem: 30px;
  --fs-title: 20px;
  --fs-body: 15px;
  --fs-cap: 12px;

  --r-sm: 8px;
  --r: 14px;
  --r-lg: 18px;
  --bd: 2px solid var(--c-primary-b);
  --sh-sticker: 0 3px 0 var(--c-primary-b);

  --sp-1: 8px;
  --sp-2: 12px;
  --sp-3: 16px;
  --sp-4: 24px;

  --font: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  margin: 0;
  height: 100%;
  font-family: var(--font);
  color: var(--c-ink);
  font-size: var(--fs-body);
  font-weight: 500;
}

body {
  background: linear-gradient(180deg, var(--bg-sky-1) 0%, var(--bg-sky-2) 100%) fixed;
  overflow: hidden;
}

/* 纸纹：极淡噪点，3% 透明度 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.8' numOctaves='2'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)'/%3E%3C/svg%3E");
}

#app {
  position: relative;
  width: 100%;
  max-width: 430px;
  height: 100dvh;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.screen {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  padding: var(--sp-3);
  padding-bottom: calc(var(--sp-3) + env(safe-area-inset-bottom));
}
.screen.on { display: flex; }

/* ---------- 通用 ---------- */
.topbar {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  min-height: 28px;
  margin-bottom: var(--sp-2);
}
.spacer { flex: 1; }

.progress {
  height: 6px;
  border-radius: 99px;
  background: #DCEFFB;
  overflow: hidden;
  flex: 1;
}
.progress > i {
  display: block;
  height: 100%;
  border-radius: 99px;
  background: var(--c-primary);
  transition: width 240ms ease-out;
}
.counter { font-size: var(--fs-cap); color: var(--c-ink3); min-width: 34px; text-align: right; }

.btn {
  height: 52px;
  width: 100%;
  border-radius: var(--r);
  border: var(--bd);
  border-bottom-color: #9FC5DF;
  background: var(--c-primary);
  color: #fff;
  font-size: 17px;
  font-weight: 700;
  font-family: var(--font);
  box-shadow: var(--sh-sticker);
  transition: transform 120ms, box-shadow 120ms;
  cursor: pointer;
}
.btn:active { transform: translateY(2px); box-shadow: 0 1px 0 var(--c-primary-b); }
.btn[disabled] { opacity: .6; filter: saturate(.6); box-shadow: none; transform: none; }
.btn.ghost {
  background: #fff;
  color: var(--c-primary);
  border: var(--bd);
  box-shadow: var(--sh-sticker);
}
.btn.ghost:active { background: var(--c-primary-l); transform: none; }
.btn.small { height: 40px; font-size: 15px; }
.btn.gold { background: var(--c-gold); border-color: #A87C24; color: #fff; }
.btn-row { display: flex; gap: var(--sp-2); }

.card {
  background: #fff;
  border-radius: var(--r-lg);
  border: 2px solid #DCE8F2;
  padding: var(--sp-3);
}
.card.flat { padding: var(--sp-2); }

.title { font-size: var(--fs-title); font-weight: 750; margin: 0 0 var(--sp-2); }
.cap { font-size: var(--fs-cap); color: var(--c-ink3); }
.muted { color: var(--c-ink2); }
.center { text-align: center; }

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 28px;
  padding: 0 10px;
  border-radius: 99px;
  background: var(--c-gold-l);
  border: 1.5px solid #E4CE9E;
  color: #8A6614;
  font-size: 14px;
  font-weight: 700;
}
.pill svg { width: 16px; height: 16px; }

.bubble {
  position: relative;
  background: #fff;
  border: var(--bd);
  border-radius: 18px 18px 18px 4px;
  padding: 12px 16px;
  max-width: 78%;
  font-size: var(--fs-body);
  line-height: 1.5;
}

/* ---------- 领养 ---------- */
.adopt-wrap { flex: 1; display: flex; flex-direction: column; justify-content: center; gap: var(--sp-3); }
.adopt-title { font-size: 24px; font-weight: 750; text-align: center; line-height: 1.4; }
.cat-choices { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--sp-3); }
.cat-choice {
  background: #fff;
  border: var(--bd);
  border-radius: var(--r-lg);
  box-shadow: var(--sh-sticker);
  padding: var(--sp-2);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  transition: transform 120ms;
}
.cat-choice:active { transform: translateY(2px); }
.cat-choice.sel { border-color: var(--c-primary); background: var(--c-primary-l); }
.cat-choice svg { width: 92px; height: 92px; }
.name-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-2); }
.name-chip {
  height: 48px;
  border-radius: var(--r);
  border: var(--bd);
  background: #fff;
  box-shadow: 0 2px 0 var(--c-primary-b);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-ink);
  font-family: var(--font);
}
.name-chip.sel { background: var(--c-primary-l); border-color: var(--c-primary); }
.pers-grid { display: grid; gap: var(--sp-2); }
.pers-item {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  background: #fff;
  border: var(--bd);
  border-radius: var(--r);
  padding: 10px 14px;
  box-shadow: 0 2px 0 var(--c-primary-b);
  font-size: 16px;
  text-align: left;
}
.pers-item.sel { background: var(--c-primary-l); border-color: var(--c-primary); }
.pers-item .emoji { font-size: 22px; }

/* ---------- 答题 ---------- */
.quiz-main { flex: 1; display: flex; flex-direction: column; justify-content: center; gap: var(--sp-3); }
.stem {
  font-size: var(--fs-stem);
  font-weight: 700;
  line-height: 1.45;
  text-align: center;
  letter-spacing: .5px;
  transition: color .25s;
}
.stem.ok { color: var(--c-mint); }
.stem.long { font-size: 22px; }
.stem.xlong { font-size: 18px; }

.answer-box {
  height: 52px;
  width: 172px;
  margin: 0 auto;
  border-radius: 12px;
  background: var(--c-primary-l);
  border: 1.5px solid var(--c-primary-b);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 0 14px;
  font-size: 26px;
  font-weight: 700;
  color: var(--c-primary);
  letter-spacing: 1px;
  position: relative;
}
.answer-box .caret {
  width: 2.5px; height: 26px; background: var(--c-primary); margin-left: 2px;
  animation: blink 1.1s infinite;
}
@keyframes blink { 0%,45%{opacity:1} 50%,95%{opacity:0} 100%{opacity:1} }
.answer-box.shake { animation: shake .32s; }
.answer-box.err { border-color: var(--c-coral); }
@keyframes shake {
  0%,100%{transform:translateX(0)} 20%{transform:translateX(-4px)} 40%{transform:translateX(4px)}
  60%{transform:translateX(-4px)} 80%{transform:translateX(4px)}
}

.frac-box { display: flex; flex-direction: column; align-items: center; gap: 4px; margin: 0 auto; width: 96px; }
.frac-box .fcell {
  width: 84px; height: 40px; border-radius: 10px; background: var(--c-primary-l);
  border: 1.5px solid var(--c-primary-b); display: flex; align-items: center; justify-content: center;
  font-size: 22px; font-weight: 700; color: var(--c-primary);
}
.frac-box .fbar { width: 84px; height: 2px; background: var(--c-ink2); border-radius: 2px; }
.frac-box .fcell.active { border-color: var(--c-primary); box-shadow: 0 0 0 2px rgba(62,143,203,.15); }

/* 竖式逐格板 */
.grid-board {
  display: none;
  justify-content: center;
  gap: 6px;
  flex-wrap: wrap;
  padding: var(--sp-2) 0;
}
.grid-board.on { display: flex; }
.gcell {
  width: 38px; height: 48px;
  border-radius: 8px;
  border: 1.5px solid var(--c-primary-b);
  background: var(--c-primary-l);
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; font-weight: 700; color: var(--c-primary);
}
.gcell.cur { border-color: var(--c-primary); border-width: 2px; }
.gcell.dot { width: 14px; background: none; border: none; color: var(--c-ink2); font-size: 24px; }
.gcell.flash { animation: flash .5s; }
@keyframes flash { 0%,100%{border-color:var(--c-primary-b)} 50%{border-color:var(--c-primary)} }

.hint-row { display: flex; align-items: center; justify-content: center; gap: var(--sp-2); min-height: 26px; }
.feedback {
  text-align: center; font-size: 15px; color: var(--c-mint); font-weight: 700;
  min-height: 24px;
}
.feedback.bad { color: var(--c-coral); }

/* 键盘 */
.keypad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-1);
  margin-top: auto;
}
.key {
  height: 56px;
  border-radius: 10px;
  background: #fff;
  border: 1.5px solid var(--c-primary-b);
  font-size: 17px;
  font-weight: 700;
  color: var(--c-ink);
  font-family: var(--font);
  box-shadow: 0 2px 0 var(--c-primary-b);
  transition: transform 90ms, background 90ms;
}
.key:active { background: #E1EFF9; transform: scale(.97); }
.key.wide { grid-column: span 3; background: var(--c-primary); color: #fff; height: 54px; border-color: #9FC5DF; }
.key.wide[disabled] { opacity: .45; box-shadow: none; }

.quiz-flash {
  position: absolute; right: 12px; top: 56px;
  font-size: 15px; font-weight: 700; color: var(--c-gold);
  opacity: 0; transform: translateY(6px);
  transition: opacity .2s, transform .2s;
  pointer-events: none;
}
.quiz-flash.on { opacity: 1; transform: translateY(-6px); }

/* ---------- 结算 ---------- */
.result-hero { text-align: center; margin: var(--sp-3) 0; }
.result-num { font-size: 44px; font-weight: 800; color: var(--c-primary); line-height: 1.1; }
.result-sub { color: var(--c-ink2); margin-top: 4px; }
.goal-list { display: grid; gap: var(--sp-1); }
.goal {
  display: flex; gap: var(--sp-1); align-items: center;
  font-size: 14px; color: var(--c-ink2);
}
.goal .dot { width: 18px; height: 18px; border-radius: 99px; border: 2px solid var(--c-primary-b); flex: none; }
.goal.done .dot { background: var(--c-mint); border-color: var(--c-mint); }
.goal.done { color: var(--c-ink); }

/* ---------- 猫的房间 ---------- */
.room-stage {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 260px;
}
.room-stage svg.cat { width: 78%; max-width: 300px; height: auto; }
.room-badges { display: flex; gap: var(--sp-1); justify-content: center; margin-bottom: var(--sp-2); }
.room-actions { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-2); }
.room-actions .btn { height: 48px; font-size: 15px; }
.cat-name { text-align: center; font-size: 17px; font-weight: 700; }
.cat-meta { text-align: center; font-size: var(--fs-cap); color: var(--c-ink3); margin-top: 2px; }
.stage-bar { height: 6px; border-radius: 99px; background: #DCEFFB; overflow: hidden; margin: 8px auto 0; width: 160px; }
.stage-bar > i { display: block; height: 100%; background: var(--c-mint); border-radius: 99px; }
.bubble-float { position: absolute; top: 6px; left: 50%; transform: translateX(-50%); }

/* ---------- 商店 ---------- */
.slot-tabs { display: flex; gap: 6px; overflow-x: auto; padding-bottom: var(--sp-1); }
.tab {
  flex: none; height: 34px; padding: 0 12px; border-radius: 99px;
  border: 1.5px solid var(--c-primary-b); background: #fff; color: var(--c-ink2);
  font-size: 13px; font-weight: 700; font-family: var(--font);
}
.tab.on { background: var(--c-primary); color: #fff; border-color: var(--c-primary); }
.shop-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--sp-2); overflow-y: auto; padding-bottom: 80px; }
.item {
  background: #fff; border: 2px solid #DCE8F2; border-radius: var(--r);
  padding: 10px; display: flex; flex-direction: column; gap: 4px; position: relative;
}
.item .ic { font-size: 30px; line-height: 1.1; }
.item .nm { font-weight: 700; font-size: 14px; }
.item .pr { font-size: var(--fs-cap); color: var(--c-gold); font-weight: 700; }
.item .st { font-size: 11px; color: var(--c-ink3); }
.item.owned { background: #F7FBFE; }
.item.equipped { border-color: var(--c-mint); }
.item button { margin-top: 4px; height: 32px; font-size: 13px; }

/* ---------- 地图 ---------- */
.map-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--sp-2); }
.cell {
  aspect-ratio: 1 / .92;
  border-radius: 12px;
  border: 2px solid #D5E4EF;
  background: #EDF4FA;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 2px; font-size: 12px; color: var(--c-ink3); font-weight: 700;
  padding: 4px; text-align: center;
}
.cell .ic { font-size: 20px; }
.cell.half { background: #C7E6DA; border-color: var(--c-mint); border-style: dashed; color: #216B53; }
.cell.full { background: var(--c-mint); border-color: #2C7B60; color: #fff; }
.cell.full .ic { filter: drop-shadow(0 1px 0 rgba(0,0,0,.15)); }
.map-note { margin-top: var(--sp-3); }

/* ---------- 弹层 ---------- */
.sheet-mask {
  position: fixed; inset: 0; display: none;
  background: rgba(234,246,255,.55);
  backdrop-filter: blur(2px);
  z-index: 20;
  align-items: flex-end; justify-content: center;
}
.sheet-mask.on { display: flex; }
.sheet {
  width: 100%; max-width: 430px; background: #fff;
  border-radius: 18px 18px 0 0; border: 2px solid var(--c-primary-b);
  padding: var(--sp-3); padding-bottom: calc(var(--sp-3) + env(safe-area-inset-bottom));
  animation: up 240ms cubic-bezier(.34,1.56,.64,1);
}
@keyframes up { from { transform: translateY(100%); } to { transform: translateY(0); } }
.sheet h3 { margin: 0 0 var(--sp-2); font-size: 17px; }

/* ---------- 提示音 / 动效 ---------- */
.cat-hop { animation: hop .5s; }
@keyframes hop { 0%,100%{transform:translateY(0)} 40%{transform:translateY(-10px)} 70%{transform:translateY(-3px)} }
.cat-breathe { animation: breathe 3.2s ease-in-out infinite; }
@keyframes breathe { 0%,100%{transform:scale(1)} 50%{transform:scale(1.012)} }

.page-enter { animation: enter .24s cubic-bezier(.34,1.56,.64,1); }
@keyframes enter { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }

.hidden { display: none !important; }