/* ===== 汉字乐园 · 小学生识字平台 样式 ===== */
:root{
  --c-sky:#a8d8ff; --c-sky-d:#7cc0f5;
  --c-sun:#ffd98a; --c-sun-d:#ffc04d;
  --c-coral:#ff9ec4; --c-coral-d:#ff6fa5;
  --c-mint:#8fe3c4; --c-mint-d:#4fcfa3;
  --c-grape:#c9a3ff; --c-grape-d:#a877e8;
  --c-ink:#5a4a66; --c-ink-soft:#8a7a96;
  --c-paper:#fff7fb;
  --c-bg1:#ffe3f1; --c-bg2:#e7e1ff; --c-bg3:#ffe9d6;
  --radius:24px; --radius-sm:16px;
  --shadow:0 8px 0 rgba(120,80,140,.10), 0 14px 28px rgba(120,80,140,.18);
  --shadow-sm:0 4px 0 rgba(120,80,140,.10), 0 8px 16px rgba(120,80,140,.15);
  --font-fun:'ZCOOL KuaiLe','PingFang SC','Microsoft YaHei',sans-serif;
  --font-body:'PingFang SC','Microsoft YaHei','Hiragino Sans GB',sans-serif;
  --font-hanzi:'KaiTi','STKaiti','Kaiti SC','楷体','Kaiti TC',serif;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
html,body{height:100%;margin:0;}
body{
  font-family:var(--font-body);
  color:var(--c-ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, var(--c-bg3), transparent 60%),
    radial-gradient(1000px 500px at 110% 10%, var(--c-bg2), transparent 55%),
    linear-gradient(160deg, var(--c-bg1), var(--c-bg2) 60%, var(--c-bg3));
  background-attachment:fixed;
  display:flex;flex-direction:column;
  overflow:hidden;
  user-select:none;
  -webkit-user-select:none;
}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit;}
h1,h2,h3{font-family:var(--font-fun);margin:0;font-weight:normal;letter-spacing:1px;}

/* 顶部栏 */
#topbar{
  flex:0 0 auto;display:flex;align-items:center;justify-content:space-between;
  padding:10px 16px;padding-top:calc(10px + env(safe-area-inset-top));
  gap:10px;z-index:20;
}
.brand{display:flex;align-items:center;gap:8px;}
.brand-logo{font-size:30px;filter:drop-shadow(0 3px 0 rgba(0,0,0,.12));animation:bob 3s ease-in-out infinite;}
.brand-name{font-family:var(--font-fun);font-size:24px;color:var(--c-coral-d);text-shadow:0 2px 0 #fff;}
.stats{display:flex;gap:8px;}
.stat{
  background:linear-gradient(180deg,#ffffff,var(--c-paper));border-radius:999px;padding:6px 10px;
  font-size:15px;font-weight:700;box-shadow:var(--shadow-sm);
  display:flex;align-items:center;gap:3px;transition:transform .12s;
  border:2px solid #fff;position:relative;
}
.stat::after{content:"";position:absolute;inset:0;border-radius:999px;box-shadow:inset 0 1px 2px rgba(255,255,255,.9);pointer-events:none;}
.stat:active{transform:scale(.92);}
.stat b{color:var(--c-grape-d);font-size:15px;}
#stat-reward,#stat-sound{padding:6px 10px;font-size:20px;}
/* 积分区图标（精致 SVG 金币 / 星形，替代原 CSS 形状） */
.stat-ic{display:inline-flex;align-items:center;}
.ic-coin{width:20px;height:20px;vertical-align:-4px;filter:drop-shadow(0 1px 1px rgba(180,120,0,.35));}
.ic-star{width:13px;height:13px;vertical-align:-1px;}
.ic-star.on{filter:drop-shadow(0 0 3px rgba(255,190,60,.85));}
.stat-stars{display:inline-flex;gap:1px;margin-left:3px;}

/* 主内容 */
#app{flex:1 1 auto;position:relative;overflow:hidden;}
.screen{
  position:absolute;inset:0;overflow-y:auto;overflow-x:hidden;
  padding:14px 16px 24px;padding-bottom:calc(24px + env(safe-area-inset-bottom));
  opacity:0;transform:translateY(12px);pointer-events:none;
  transition:opacity .25s, transform .25s;
}
.screen.active{opacity:1;transform:none;pointer-events:auto;}
.screen::-webkit-scrollbar{width:0;}

/* 底部导航 */
#bottomnav{
  flex:0 0 auto;display:flex;justify-content:space-around;align-items:stretch;
  background:var(--c-paper);box-shadow:0 -6px 18px rgba(80,60,120,.12);
  padding-bottom:env(safe-area-inset-bottom);z-index:20;
}
.nav-btn{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:2px;padding:10px 4px 12px;color:var(--c-ink-soft);position:relative;
  transition:transform .12s;
}
.nav-btn span{font-size:24px;transition:transform .2s;}
.nav-btn small{font-size:12px;font-family:var(--font-fun);}
.nav-btn.active{color:var(--c-grape-d);}
.nav-btn.active span{transform:translateY(-3px) scale(1.12);}
.nav-btn:active{transform:scale(.9);}
.nav-btn.active::before{
  content:"";position:absolute;top:6px;width:38px;height:38px;border-radius:50%;
  background:radial-gradient(circle, var(--c-sun), transparent 70%);opacity:.5;
}

/* 通用卡片 / 按钮 */
.card{
  background:var(--c-paper);border-radius:var(--radius);box-shadow:var(--shadow);
  padding:16px;
}
.btn{
  border-radius:var(--radius-sm);padding:14px 18px;font-size:18px;font-weight:800;
  color:#fff;box-shadow:var(--shadow-sm);transition:transform .12s, filter .12s;
  font-family:var(--font-fun);letter-spacing:1px;
}
.btn:active{transform:translateY(3px);box-shadow:0 2px 0 rgba(0,0,0,.1);}
.btn-sky{background:linear-gradient(180deg,var(--c-sky),var(--c-sky-d));}
.btn-sun{background:linear-gradient(180deg,var(--c-sun),var(--c-sun-d));}
.btn-coral{background:linear-gradient(180deg,var(--c-coral),var(--c-coral-d));}
.btn-mint{background:linear-gradient(180deg,var(--c-mint),var(--c-mint-d));}
.btn-grape{background:linear-gradient(180deg,var(--c-grape),var(--c-grape-d));}
.btn-theme{background:linear-gradient(180deg,var(--c-coral),var(--c-coral-d));}
.btn-ghost{background:#fff;color:var(--c-grape-d);border:3px solid var(--c-grape);box-shadow:var(--shadow-sm);}
.btn:disabled{filter:grayscale(.6);opacity:.6;}

/* 首页 */
.hero{
  background:linear-gradient(135deg,var(--c-coral),var(--c-grape));
  border-radius:var(--radius);padding:18px;color:#fff;box-shadow:var(--shadow);
  display:flex;align-items:center;gap:14px;margin-bottom:16px;position:relative;overflow:hidden;
}
.hero::after{content:"💕";position:absolute;right:-6px;top:-14px;font-size:80px;opacity:.3;transform:rotate(15deg);animation:bob 3s ease-in-out infinite;}
.hero::before{content:"🌸";position:absolute;right:54px;bottom:-14px;font-size:54px;opacity:.35;transform:rotate(-12deg);}
.hero-mascot{font-size:56px;animation:bob 2.4s ease-in-out infinite;filter:drop-shadow(0 4px 0 rgba(0,0,0,.15));cursor:pointer;}
.hero-mascot:active{transform:scale(.92);}
.nick-hint{display:inline-block;margin-top:2px;font-size:12px;color:#fff;background:rgba(255,255,255,.22);padding:2px 10px;border-radius:999px;cursor:pointer;}
.hero-text h2{font-size:24px;color:#fff;text-shadow:0 2px 0 rgba(0,0,0,.15);}
.hero-text p{margin:4px 0 0;font-size:14px;opacity:.95;}

.section-title{font-size:20px;color:var(--c-coral-d);margin:18px 4px 10px;display:flex;align-items:center;gap:8px;}
.section-title .pill{font-size:13px;background:var(--c-sun);color:#7a5a00;padding:2px 10px;border-radius:999px;font-family:var(--font-body);font-weight:700;}

.chapter-list{display:flex;flex-direction:column;gap:12px;}
.chapter{
  display:flex;align-items:center;gap:14px;background:var(--c-paper);
  border-radius:var(--radius);padding:14px 16px;box-shadow:var(--shadow-sm);
  transition:transform .12s;position:relative;overflow:hidden;
}
.chapter:active{transform:scale(.98);}
.chapter .emoji{font-size:40px;width:56px;height:56px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--c-bg2),var(--c-bg3));border-radius:18px;flex:0 0 auto;}
.chapter .info{flex:1;min-width:0;}
.chapter .info h3{font-size:19px;color:var(--c-ink);}
.chapter .info .sub{font-size:13px;color:var(--c-ink-soft);margin-top:2px;}
.progress{height:10px;background:#eee;border-radius:999px;overflow:hidden;margin-top:8px;}
.progress > i{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,var(--c-mint),var(--c-sky));transition:width .5s;}
.chapter .lock{position:absolute;inset:0;background:rgba(255,255,255,.72);backdrop-filter:blur(2px);
  display:flex;align-items:center;justify-content:center;font-size:14px;color:var(--c-ink-soft);font-weight:700;gap:6px;}
.chapter.locked{pointer-events:none;}
/* 关卡完成留痕：已学 / 已通关 标记 */
.chapter-done{position:absolute;top:10px;right:12px;font-size:12px;font-weight:800;padding:3px 10px;border-radius:999px;box-shadow:var(--shadow-sm);z-index:2;}
.chapter-done.part{background:linear-gradient(135deg,#bfead0,#8fe3c4);color:#0a5b41;}
.chapter-done.full{background:linear-gradient(135deg,#ffe08a,#ffb300);color:#7a4a00;animation:bob 2.6s ease-in-out infinite;}

.quick-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;}
.quick{
  border-radius:var(--radius);padding:16px;color:#fff;box-shadow:var(--shadow-sm);
  display:flex;flex-direction:column;gap:6px;transition:transform .12s;text-align:left;
}
.quick:active{transform:translateY(3px);}
.quick .qi{font-size:34px;}
.quick .qt{font-family:var(--font-fun);font-size:18px;}
.quick .qs{font-size:12px;opacity:.92;}

/* 模块通用头部 */
.module-head{display:flex;align-items:center;gap:10px;margin-bottom:14px;}
.module-head .back{font-size:22px;background:#fff;border-radius:14px;width:42px;height:42px;box-shadow:var(--shadow-sm);}
.module-head h2{font-size:22px;color:var(--c-grape-d);}
.module-head .chapter-tag{margin-left:auto;background:var(--c-sun);color:#7a5a00;font-weight:800;
  padding:6px 12px;border-radius:999px;font-size:13px;box-shadow:var(--shadow-sm);}

/* 识字卡片 */
.flash-wrap{display:flex;flex-direction:column;align-items:center;gap:16px;padding-top:6px;}
.flash-card{
  width:min(78vw,340px);height:min(78vw,340px);perspective:1000px;cursor:pointer;position:relative;
}
.flash-inner{position:absolute;inset:0;transition:transform .6s;transform-style:preserve-3d;}
.flash-card.flipped .flash-inner{transform:rotateY(180deg);}
.flash-face{
  position:absolute;inset:0;backface-visibility:hidden;border-radius:28px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;box-shadow:var(--shadow);
  padding:18px;
}
.flash-front{background:linear-gradient(160deg,#fff,#eaf6ff);}
.flash-back{background:linear-gradient(160deg,#fff,#fff0f6);transform:rotateY(180deg);}
.flash-hanzi{font-size:150px;line-height:1;font-family:var(--font-hanzi);color:var(--c-coral-d);text-shadow:0 6px 0 rgba(255,122,138,.18);}
.flash-py{font-size:26px;color:var(--c-grape-d);font-weight:800;margin-top:6px;}
.flash-flip-hint{position:absolute;bottom:12px;font-size:12px;color:var(--c-ink-soft);}
.flash-pic{font-size:58px;line-height:1;margin-bottom:2px;filter:drop-shadow(0 3px 0 rgba(120,80,140,.12));}
.b-pic{font-size:38px;margin:4px 0 2px;filter:drop-shadow(0 2px 0 rgba(120,80,140,.12));}
.flash-back .row{display:flex;flex-direction:column;align-items:center;gap:4px;width:100%;}
.flash-back .b-py{font-size:24px;color:var(--c-grape-d);font-weight:800;}
.flash-back .b-rad{font-size:15px;color:var(--c-ink-soft);}
.flash-back .b-m{font-size:16px;color:var(--c-ink);margin:6px 0;text-align:center;line-height:1.4;}
.flash-back .b-w{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;}
.flash-back .b-w span{background:var(--c-mint);color:#0a5b41;padding:4px 10px;border-radius:999px;font-size:14px;font-weight:700;}
.flash-actions{display:flex;gap:12px;width:100%;justify-content:center;}
.flash-actions .btn{flex:1;max-width:160px;}
.flash-progress{font-size:14px;color:var(--c-ink-soft);font-weight:700;}
/* 数字类限时模式倒计时条 */
.flash-timer{width:min(80vw,340px);height:10px;background:#f0e6f5;border-radius:999px;overflow:hidden;margin-bottom:2px;}
.flash-timer i{display:block;height:100%;width:100%;background:linear-gradient(90deg,var(--c-coral),var(--c-sun));transition:width .1s linear;}

/* 发音跟读 */
.read-wrap{display:flex;flex-direction:column;align-items:center;gap:16px;}
.big-char{font-size:130px;font-family:var(--font-hanzi);color:var(--c-grape-d);text-shadow:0 6px 0 rgba(138,92,246,.16);line-height:1;}
.big-py{font-size:28px;font-weight:800;color:var(--c-coral-d);}
.read-pic{font-size:64px;line-height:1;margin-top:6px;filter:drop-shadow(0 3px 0 rgba(120,80,140,.12));}
.read-btns{display:flex;gap:12px;flex-wrap:wrap;justify-content:center;}
.mic-orb{
  width:120px;height:120px;border-radius:50%;background:linear-gradient(135deg,var(--c-mint),var(--c-sky));
  display:flex;align-items:center;justify-content:center;font-size:54px;color:#fff;box-shadow:var(--shadow);
  transition:transform .15s;position:relative;
}
.mic-orb.listening{animation:pulse 1s ease-in-out infinite;}
.mic-orb:active{transform:scale(.92);}
.wave{display:flex;gap:4px;align-items:flex-end;height:40px;justify-content:center;margin-top:4px;}
.wave i{width:6px;background:var(--c-grape);border-radius:4px;height:8px;}
.wave.on i{animation:wave .6s ease-in-out infinite;}
.wave.on i:nth-child(2){animation-delay:.1s}.wave.on i:nth-child(3){animation-delay:.2s}
.wave.on i:nth-child(4){animation-delay:.3s}.wave.on i:nth-child(5){animation-delay:.4s}
.feedback-stars{font-size:34px;letter-spacing:6px;min-height:42px;}

/* 书写练习 */
.write-wrap{display:flex;flex-direction:column;align-items:center;gap:14px;}
#writer-target{width:min(80vw,320px);height:min(80vw,320px);background:#fff;border-radius:24px;
  box-shadow:var(--shadow);position:relative;}
#writer-target .hint{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  color:var(--c-ink-soft);font-size:16px;text-align:center;padding:20px;}
.write-info{text-align:center;}
.write-info .w-py{font-size:24px;color:var(--c-grape-d);font-weight:800;}
.write-info .w-m{font-size:15px;color:var(--c-ink);margin-top:2px;}
.write-pic{font-size:44px;margin-top:4px;filter:drop-shadow(0 3px 0 rgba(120,80,140,.12));}
.write-toolbar{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;}

/* 游戏 */
.game-pick{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;}
.game-card{border-radius:var(--radius);padding:18px;color:#fff;box-shadow:var(--shadow-sm);text-align:left;transition:transform .12s;}
.game-card:active{transform:translateY(3px);}
.game-card .gi{font-size:40px;}
.game-card .gt{font-family:var(--font-fun);font-size:19px;margin-top:6px;}
.game-card .gd{font-size:13px;opacity:.92;margin-top:2px;}
/* 难度等级角标（由易到难 1→20） */
.game-lv{position:absolute;top:10px;left:10px;font-family:var(--font-fun);font-size:12px;font-weight:800;
  background:rgba(255,255,255,.85);color:var(--c-grape-d);padding:2px 9px;border-radius:999px;box-shadow:var(--shadow-sm);z-index:3;}
/* 未解锁遮罩 + 所需积分/星星门槛 */
.game-card{position:relative;overflow:hidden;}
.game-card.locked{cursor:not-allowed;filter:saturate(.55);}
.game-lock{position:absolute;inset:0;background:rgba(255,255,255,.74);backdrop-filter:blur(2px);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;z-index:4;}
.game-lock .gl-ic{font-size:26px;}
.game-lock .gl-req{font-size:13px;font-weight:800;color:var(--c-ink);background:var(--c-sun);padding:3px 12px;border-radius:999px;box-shadow:var(--shadow-sm);}
.game-stage{display:flex;flex-direction:column;align-items:center;gap:16px;}
.game-q{font-family:var(--font-fun);font-size:22px;color:var(--c-ink);text-align:center;}
.game-hint{font-size:15px;color:var(--c-ink-soft);background:#fff;border-radius:999px;padding:6px 16px;box-shadow:var(--shadow-sm);}
.option-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;width:100%;max-width:420px;}
.opt{
  background:#fff;border-radius:var(--radius-sm);padding:22px 10px;font-size:46px;font-family:var(--font-hanzi);
  color:var(--c-ink);box-shadow:var(--shadow-sm);transition:transform .12s, background .2s;
  display:flex;align-items:center;justify-content:center;min-height:96px;
}
.opt:active{transform:scale(.94);}
.opt.correct{background:var(--c-mint);color:#fff;animation:pop .4s;}
.opt.wrong{background:var(--c-coral);color:#fff;animation:shake .4s;}
.opt.py-opt{font-size:30px;color:var(--c-grape-d);}
.game-score{font-size:18px;font-weight:800;color:var(--c-grape-d);}
.life{font-size:20px;letter-spacing:3px;}

/* 记忆翻牌 */
.memory-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;width:100%;max-width:460px;}
.mem{
  aspect-ratio:1/1;border-radius:16px;position:relative;cursor:pointer;
  transform-style:preserve-3d;transition:transform .4s;box-shadow:var(--shadow-sm);
}
.mem .face{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  backface-visibility:hidden;border-radius:16px;font-family:var(--font-hanzi);}
.mem .back{background:linear-gradient(135deg,var(--c-grape),var(--c-sky));color:#fff;font-size:34px;}
.mem .front{background:#fff;color:var(--c-ink);font-size:30px;transform:rotateY(180deg);}
.mem.flipped{transform:rotateY(180deg);}
.mem.matched{transform:rotateY(180deg);}
.mem.matched .front{background:linear-gradient(135deg,var(--c-mint),var(--c-mint-d));color:#fff;}
.mem.matched .front::after{content:"✓";position:absolute;top:4px;right:7px;font-size:18px;font-weight:800;}

/* 奖励 */
.reward-head{text-align:center;margin-bottom:14px;}
.reward-head .big{font-family:var(--font-fun);font-size:26px;color:var(--c-coral-d);}
.badge-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;}
.badge{
  background:var(--c-paper);border-radius:var(--radius);padding:16px 10px;text-align:center;box-shadow:var(--shadow-sm);
  display:flex;flex-direction:column;align-items:center;gap:6px;transition:transform .2s;
}
.badge .bi{font-size:46px;filter:grayscale(1);opacity:.4;}
.badge.earned .bi{filter:none;opacity:1;animation:bob 2.6s ease-in-out infinite;}
.badge .bn{font-family:var(--font-fun);font-size:15px;color:var(--c-ink);}
.badge .bd{font-size:12px;color:var(--c-ink-soft);}
.badge.earned{border:3px solid var(--c-sun);}
/* 奖励页：积分用金币图案展示 */
.rci{display:inline-flex;vertical-align:middle;margin:0 2px;}
.rci svg{width:34px;height:34px;}

/* 浮层 */
.overlay{position:fixed;inset:0;background:rgba(40,30,70,.45);backdrop-filter:blur(3px);
  display:flex;align-items:flex-end;justify-content:center;z-index:60;transition:opacity .2s;}
.overlay.hidden{opacity:0;pointer-events:none;}
.overlay-card{background:var(--c-paper);width:100%;max-width:560px;border-radius:28px 28px 0 0;
  padding:18px;max-height:80vh;overflow-y:auto;box-shadow:0 -10px 30px rgba(0,0,0,.2);
  animation:slideUp .3s ease;}
.overlay-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px;}
.overlay-head h3{font-size:22px;color:var(--c-grape-d);}
.icon-btn{font-size:22px;background:#f0ecff;border-radius:50%;width:40px;height:40px;color:var(--c-grape-d);}
.overlay-back{font-family:var(--font-fun);font-size:15px;font-weight:700;color:var(--c-grape-d);
  background:#f0ecff;border-radius:999px;padding:8px 14px;display:flex;align-items:center;gap:2px;transition:transform .12s;}
.overlay-back:active{transform:scale(.94);}
.overlay-body{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;}
.chip{background:#fff;border:3px solid var(--c-sky);border-radius:18px;padding:14px;text-align:center;
  box-shadow:var(--shadow-sm);transition:transform .12s;}
.chip:active{transform:scale(.95);}
.chip.locked{filter:grayscale(.7);opacity:.55;border-color:#ccc;}
.chip .ce{font-size:34px;}
.chip .cn{font-family:var(--font-fun);font-size:16px;color:var(--c-ink);margin-top:4px;}
.chip .cs{font-size:12px;color:var(--c-ink-soft);}

/* 撒花 & 提示 */
#confetti{position:fixed;inset:0;pointer-events:none;z-index:80;}
.toast{position:fixed;left:50%;bottom:90px;transform:translateX(-50%) translateY(20px);
  background:var(--c-ink);color:#fff;padding:12px 20px;border-radius:999px;font-weight:700;font-size:15px;
  box-shadow:var(--shadow);z-index:90;opacity:0;transition:opacity .25s, transform .25s;max-width:90vw;text-align:center;}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0);}

/* 弹窗（过关） */
.modal{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;z-index:70;
  background:rgba(40,30,70,.4);backdrop-filter:blur(3px);}
.modal.hidden{display:none;}
.modal-card{background:var(--c-paper);border-radius:28px;padding:26px 24px;text-align:center;max-width:340px;
  box-shadow:var(--shadow);animation:pop .4s;position:relative;}
.modal-card .mc-emoji{font-size:70px;animation:bob 2s ease-in-out infinite;}
.modal-card h2{font-size:26px;color:var(--c-coral-d);margin:8px 0;}
.modal-card p{color:var(--c-ink-soft);font-size:15px;margin:0 0 16px;}
.modal-card .stars{font-size:40px;letter-spacing:8px;margin-bottom:14px;}

/* 动画 */
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
@keyframes pulse{0%,100%{transform:scale(1)}50%{transform:scale(1.08)}}
@keyframes pop{0%{transform:scale(.6);opacity:0}60%{transform:scale(1.12)}100%{transform:scale(1);opacity:1}}
@keyframes shake{0%,100%{transform:translateX(0)}20%,60%{transform:translateX(-8px)}40%,80%{transform:translateX(8px)}}
@keyframes wave{0%,100%{height:8px}50%{height:34px}}
@keyframes slideUp{from{transform:translateY(40px);opacity:.6}to{transform:translateY(0);opacity:1}}
.float-up{animation:floatUp .9s ease forwards;}
@keyframes floatUp{0%{transform:translateY(0);opacity:1}100%{transform:translateY(-60px);opacity:0}}

@media (max-width:380px){
  .flash-hanzi{font-size:120px;}
  .big-char{font-size:104px;}
}
@media (min-width:900px){
  #app{max-width:760px;margin:0 auto;}
  #bottomnav{max-width:760px;margin:0 auto;}
}