:root{
  --pink:#FF9EC8; --pink-soft:#FFE0EF;
  --blue:#7FC8F8; --blue-soft:#E1F3FF;
  --yellow:#FFD66B; --yellow-soft:#FFF3D1;
  --green:#8FE0A4; --green-soft:#E2FBEB;
  --purple:#C9A3F2; --purple-soft:#F1E6FF;
  --ink:#4A3B5C; --ink-soft:#7C6E8E;
  --bg:#FFF7FB; --card:#FFFFFF;
  --shadow:0 8px 24px rgba(180,140,200,.18);
  --radius:22px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
html,body{margin:0;padding:0;}
body{
  font-family:var(--font);color:var(--ink);background:
    radial-gradient(circle at 12% 8%,var(--pink-soft) 0,transparent 42%),
    radial-gradient(circle at 88% 12%,var(--blue-soft) 0,transparent 40%),
    radial-gradient(circle at 50% 100%,var(--green-soft) 0,transparent 45%),
    var(--bg);
  min-height:100vh;-webkit-font-smoothing:antialiased;
}
button{font-family:var(--font);cursor:pointer;border:none;background:none;color:inherit;}
.tap{min-width:44px;min-height:44px;}

/* ===== Layout ===== */
.app{display:flex;min-height:100vh;}
.sidebar{
  width:200px;flex:0 0 200px;background:linear-gradient(180deg,var(--purple-soft),var(--blue-soft));
  padding:18px 12px;display:flex;flex-direction:column;gap:8px;position:sticky;top:0;height:100vh;
}
.brand{display:flex;align-items:center;gap:8px;padding:6px 8px 14px;font-weight:800;font-size:18px;color:var(--ink);}
.brand .logo{width:38px;height:38px;border-radius:14px;background:linear-gradient(135deg,var(--pink),var(--yellow));display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow);}
.nav-item{
  display:flex;align-items:center;gap:10px;padding:12px 14px;border-radius:16px;font-size:15px;font-weight:700;
  color:var(--ink-soft);transition:.18s;min-height:48px;
}
.nav-item svg{width:22px;height:22px;flex:0 0 22px;}
.nav-item:hover{background:rgba(255,255,255,.6);}
.nav-item.active{background:#fff;color:var(--ink);box-shadow:var(--shadow);}
.nav-item .emoji{font-size:20px;}

.main{flex:1;min-width:0;display:flex;flex-direction:column;}
.topbar{
  display:flex;align-items:center;justify-content:space-between;padding:14px 20px;gap:12px;position:sticky;top:0;z-index:20;
  background:rgba(255,247,251,.85);backdrop-filter:blur(8px);
}
.topbar .title{font-size:20px;font-weight:800;}
.top-right{display:flex;align-items:center;gap:10px;}
.sync-badge{
  display:flex;align-items:center;gap:6px;font-size:13px;font-weight:700;padding:7px 12px;border-radius:20px;
  background:#fff;box-shadow:var(--shadow);color:var(--ink-soft);
}
.sync-dot{width:9px;height:9px;border-radius:50%;background:var(--green);}
.sync-badge.syncing .sync-dot{background:var(--yellow);animation:pulse 1s infinite;}
.sync-badge.offline .sync-dot{background:#bbb;}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.3}}

.content{padding:8px 20px 120px;max-width:1100px;width:100%;margin:0 auto;}

/* ===== Home cards ===== */
.hero{
  background:linear-gradient(120deg,var(--pink),var(--purple) 55%,var(--blue));
  border-radius:var(--radius);padding:22px;color:#fff;box-shadow:var(--shadow);position:relative;overflow:hidden;
}
.hero h1{margin:0 0 6px;font-size:26px;}
.hero p{margin:0;opacity:.95;font-weight:600;}
.star-count{position:absolute;right:18px;top:18px;background:rgba(255,255,255,.25);border-radius:18px;padding:8px 14px;font-weight:800;display:flex;align-items:center;gap:6px;}
.progress-wrap{margin-top:16px;background:rgba(255,255,255,.3);border-radius:14px;height:16px;overflow:hidden;}
.progress-bar{height:100%;background:#fff;border-radius:14px;transition:width .5s;}

.section-title{font-size:17px;font-weight:800;margin:22px 4px 12px;display:flex;align-items:center;gap:8px;}
.tiles{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px;}
.tile{
  background:var(--card);border-radius:var(--radius);padding:18px;text-align:center;box-shadow:var(--shadow);
  transition:.18s;min-height:120px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;
}
.tile:active{transform:scale(.96);}
.tile .ic{width:54px;height:54px;border-radius:18px;display:flex;align-items:center;justify-content:center;}
.tile .nm{font-weight:800;font-size:15px;}
.tile .ds{font-size:12px;color:var(--ink-soft);}

.panel{background:var(--card);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);margin-bottom:18px;}
.panel h2{margin:0 0 14px;font-size:19px;display:flex;align-items:center;gap:8px;}

/* ===== Letters ===== */
.letter-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(92px,1fr));gap:12px;}
.letter-card{
  background:var(--card);border-radius:18px;padding:14px 6px;text-align:center;box-shadow:var(--shadow);
  transition:.15s;display:flex;flex-direction:column;align-items:center;gap:4px;
}
.letter-card:active{transform:scale(.94);}
.letter-big{font-size:34px;font-weight:900;line-height:1;}
.letter-small{font-size:18px;font-weight:700;color:var(--ink-soft);}
.letter-word{font-size:11px;color:var(--ink-soft);margin-top:2px;}

/* ===== Poem ===== */
.poem-list{display:grid;gap:14px;}
.poem-card{background:var(--card);border-radius:18px;padding:16px;box-shadow:var(--shadow);}
.poem-card .ttl{font-weight:800;font-size:16px;display:flex;justify-content:space-between;align-items:center;gap:8px;}
.poem-read{background:var(--green);color:#fff;border-radius:14px;padding:8px 14px;font-weight:700;min-height:40px;}
.poem-body{margin-top:10px;line-height:2.1;}
.poem-line{display:flex;flex-wrap:wrap;gap:10px 14px;}
.char{display:flex;flex-direction:column;align-items:center;}
.char .py{font-size:11px;color:var(--purple);font-weight:700;}
.char .hz{font-size:20px;font-weight:700;}

/* ===== Number ===== */
.num-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(80px,1fr));gap:10px;}
.num-card{background:var(--card);border-radius:16px;padding:12px 4px;text-align:center;box-shadow:var(--shadow);font-size:28px;font-weight:900;transition:.15s;}
.num-card:active{transform:scale(.93);}
.quiz-box{text-align:center;padding:10px 0;}
.quiz-q{font-size:40px;font-weight:900;margin:14px 0;letter-spacing:2px;}
.opts{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;max-width:360px;margin:0 auto;}
.opt{
  background:var(--yellow-soft);border-radius:18px;padding:18px;font-size:30px;font-weight:900;color:var(--ink);
  transition:.15s;box-shadow:var(--shadow);min-height:64px;
}
.opt:active{transform:scale(.95);}
.opt.right{background:var(--green);color:#fff;}
.opt.wrong{background:#FFB3B3;color:#7a2b2b;}
.feedback{font-size:18px;font-weight:800;margin-top:14px;min-height:26px;}

/* ===== Logic ===== */
.logic-seq{display:flex;justify-content:center;align-items:center;gap:10px;flex-wrap:wrap;margin:14px 0;font-size:40px;font-weight:900;}
.logic-seq .q{color:var(--purple);background:var(--purple-soft);border-radius:50%;width:58px;height:58px;display:flex;align-items:center;justify-content:center;}

/* ===== Adventure ===== */
.badge-wall{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:14px;margin-top:6px;}
.badge{
  background:var(--card);border-radius:18px;padding:16px 10px;text-align:center;box-shadow:var(--shadow);
  display:flex;flex-direction:column;align-items:center;gap:8px;
}
.badge .medal{width:62px;height:62px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:30px;background:var(--yellow-soft);filter:grayscale(1);opacity:.5;}
.badge.unlocked .medal{filter:none;opacity:1;background:linear-gradient(135deg,var(--yellow),var(--pink));}
.badge .bn{font-weight:800;font-size:13px;}
.badge .bd{font-size:11px;color:var(--ink-soft);}
.level-pill{display:inline-flex;align-items:center;gap:6px;background:var(--blue-soft);border-radius:14px;padding:6px 12px;font-weight:700;font-size:13px;}

/* ===== Bottom tab (mobile) ===== */
.bottom-tab{display:none;}
@media(max-width:768px){
  .sidebar{display:none;}
  .bottom-tab{
    display:flex;position:fixed;bottom:0;left:0;right:0;z-index:30;
    background:rgba(255,255,255,.96);backdrop-filter:blur(10px);
    box-shadow:0 -4px 18px rgba(180,140,200,.18);
    padding:6px 4px calc(6px + env(safe-area-inset-bottom));
    justify-content:space-around;
  }
  .tab-btn{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;padding:6px 2px;color:var(--ink-soft);font-size:11px;font-weight:700;min-height:52px;justify-content:center;}
  .tab-btn svg{width:24px;height:24px;}
  .tab-btn.active{color:var(--purple);}
  .content{padding:8px 14px 130px;}
  .topbar{padding:12px 14px;}
  .hero h1{font-size:22px;}
  .quiz-q{font-size:32px;}
}
.hidden{display:none!important;}
.toast{
  position:fixed;left:50%;bottom:90px;transform:translateX(-50%) translateY(20px);
  background:var(--ink);color:#fff;padding:12px 22px;border-radius:24px;font-weight:700;font-size:15px;
  opacity:0;transition:.25s;z-index:50;pointer-events:none;box-shadow:var(--shadow);
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0);}
.row{display:flex;gap:10px;flex-wrap:wrap;}
.btn{
  background:var(--purple);color:#fff;border-radius:16px;padding:13px 22px;font-weight:800;font-size:15px;
  box-shadow:var(--shadow);min-height:48px;transition:.15s;
}
.btn:active{transform:scale(.96);}
.btn.ghost{background:#fff;color:var(--ink);}
.btn.blue{background:var(--blue);}
.btn.green{background:var(--green);}
.btn.yellow{background:var(--yellow);color:var(--ink);}
.hint{font-size:13px;color:var(--ink-soft);line-height:1.7;}

/* ===== Login overlay ===== */
.login-overlay{
  position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--pink-soft),var(--blue-soft));
  padding:20px;
}
.login-card{
  background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);
  padding:28px 24px;width:100%;max-width:360px;text-align:center;
}
.login-logo{font-size:46px;}
.login-card h1{font-size:22px;margin:6px 0 4px;}
.login-tabs{display:flex;gap:8px;margin:18px 0 6px;}
.login-tab{flex:1;padding:10px;border-radius:14px;font-weight:800;background:var(--bg);color:var(--ink-soft);min-height:44px;}
.login-tab.active{background:var(--purple);color:#fff;}
.login-input{
  width:100%;min-height:48px;margin:8px 0;padding:0 16px;
  border:2px solid var(--purple-soft);border-radius:14px;font-size:16px;font-family:var(--font);outline:none;
}
.login-input:focus{border-color:var(--purple);}
.login-msg{color:#e0567a;font-size:13px;font-weight:700;min-height:18px;margin-top:6px;}