/* ==========================================================================
   幼儿启蒙字母乐园 · 暖阳陶土
   陶土暖橙 · 手工质感 · 柔和阴影 · 自然肌理
   ========================================================================== */
@import url('https://fonts.googleapis.com/css2?family=Quicksand:wght@500;600;700&family=Noto+Serif+SC:wght@500;600;700&display=swap');

:root{
  --c-primary:#32ae63;
  --c-secondary:#9f4bbe;
  --c-accent:#2dd2c1;
  --c-bg:#f8fbfa;
  --c-surface:#ffffff;
  --c-text:#1b2c22;
  --c-muted:#5c7a68;
  --c-line:#dbe6df;
  --radius:16px;
  --font-head:'Quicksand','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  --font-body:'Noto Serif SC','Songti SC','STSong',Georgia,'Times New Roman',serif;
  --shadow-soft:0 8px 20px rgba(27,44,34,.09), 0 3px 6px rgba(27,44,34,.05);
  --shadow-lift:0 16px 34px rgba(27,44,34,.15), 0 5px 12px rgba(27,44,34,.08);
  --shadow-inset:inset 0 2px 6px rgba(27,44,34,.06);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-body);
  color:var(--c-text);
  background:var(--c-bg);
  min-height:100vh;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  position:relative;
}
/* 自然肌理：细微噪点 */
body::before{
  content:"";
  position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix type='saturate' values='0'/></filter><rect width='160' height='160' filter='url(%23n)' opacity='0.05'/></svg>");
  opacity:.7;
}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
ul{list-style:none}

/* ---------- 顶部 ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
  border-bottom:1px solid var(--c-line);
  box-shadow:0 2px 10px rgba(27,44,34,.05);
}
.header-inner{
  max-width:1100px;margin:0 auto;padding:12px 20px;
  display:flex;align-items:center;gap:16px;flex-wrap:wrap;
}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-head);font-weight:700;font-size:1.2rem;letter-spacing:.3px;color:var(--c-text)}
.brand-logo{
  width:44px;height:44px;border-radius:14px;
  background:linear-gradient(135deg,var(--c-primary),var(--c-accent));
  display:grid;place-items:center;color:#fff;
  font-family:var(--font-head);font-weight:700;font-size:1.05rem;letter-spacing:-1px;
  box-shadow:var(--shadow-soft);transform:rotate(-5deg);
}
.nav{display:flex;gap:6px;margin-left:auto;flex-wrap:wrap}
.nav a{
  padding:8px 14px;border-radius:12px;
  font-family:var(--font-head);font-weight:600;font-size:.95rem;
  color:var(--c-muted);transition:background .2s,color .2s,transform .15s;
}
.nav a:hover{background:rgba(50,174,99,.1);color:var(--c-primary)}
.nav a.active{background:var(--c-primary);color:#fff;box-shadow:var(--shadow-soft)}
.nav a:active{transform:scale(.95)}

.page{position:relative;z-index:1;max-width:1100px;margin:0 auto;padding:26px 20px 70px}

/* ---------- 主视觉 Hero ---------- */
.hero{
  position:relative;overflow:hidden;text-align:center;
  background:var(--c-surface);
  border:1px solid var(--c-line);
  border-radius:28px;
  padding:44px 26px 40px;
  box-shadow:var(--shadow-soft);
}
.hero::after{ /* 手作缝合线 */
  content:"";position:absolute;left:18px;right:18px;top:12px;
  border-top:2px dashed rgba(45,210,193,.35);border-radius:4px;
}
.hero-blob{position:absolute;border-radius:50%;opacity:.16;pointer-events:none}
.hero-blob.b1{width:180px;height:180px;background:var(--c-primary);top:-60px;left:-50px}
.hero-blob.b2{width:120px;height:120px;background:var(--c-secondary);bottom:-40px;right:-30px}
.hero-blob.b3{width:70px;height:70px;background:var(--c-accent);top:30%;right:8%}
.hero-sticker{
  position:absolute;font-size:2.1rem;top:22px;right:26px;
  filter:drop-shadow(0 4px 8px rgba(27,44,34,.18));
  animation:float 4s ease-in-out infinite;
}
.hero-eyebrow{
  font-family:var(--font-head);font-weight:600;letter-spacing:3px;
  font-size:.8rem;color:var(--c-muted);text-transform:uppercase;
}
.hero h1{
  font-family:var(--font-head);font-weight:700;
  font-size:clamp(1.9rem,5vw,3rem);margin-top:6px;color:var(--c-text);
}
.hero .hl{color:var(--c-primary);position:relative;white-space:nowrap}
.hero .hl::after{
  content:"";position:absolute;left:2px;right:2px;bottom:2px;height:.35em;
  background:rgba(45,210,193,.35);border-radius:4px;z-index:-1;
}
.hero .sub{color:var(--c-muted);font-size:1.05rem;max-width:620px;margin:10px auto 0}
.hero-today{
  display:inline-flex;align-items:center;gap:12px;flex-wrap:wrap;justify-content:center;
  margin-top:22px;background:var(--c-bg);border:1px solid var(--c-line);
  border-radius:var(--radius);padding:10px 14px;box-shadow:var(--shadow-inset);
  font-family:var(--font-head);color:var(--c-muted);font-size:.95rem;
}
.today-letter{
  width:52px;height:52px;border-radius:14px;
  background:linear-gradient(135deg,var(--c-secondary),var(--c-accent));
  color:#fff;font-family:var(--font-head);font-weight:700;font-size:1.7rem;
  box-shadow:var(--shadow-soft);transform:rotate(-4deg);
  transition:transform .2s;
}
.today-letter:hover{transform:rotate(0) translateY(-2px)}
.hero-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:24px}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:var(--radius);
  font-family:var(--font-head);font-weight:700;font-size:1rem;line-height:1.2;
  transition:transform .15s,box-shadow .15s,background .2s,color .2s;
  box-shadow:var(--shadow-soft);
}
.btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-lift)}
.btn:active{transform:translateY(0) scale(.96)}
.btn-lg{padding:15px 30px;font-size:1.1rem}
.btn-sm{padding:8px 14px;font-size:.85rem}
.btn-primary{background:var(--c-primary);color:#fff}
.btn-primary:hover{background:#2b9a56}
.btn-accent{background:var(--c-accent);color:#0b3b35}
.btn-accent:hover{background:#24bfae}
.btn-secondary{background:var(--c-secondary);color:#fff}
.btn-secondary:hover{background:#8c3fa8}
.btn-ghost{background:var(--c-surface);color:var(--c-primary);border:2px solid var(--c-line)}
.btn-ghost:hover{border-color:var(--c-primary);background:rgba(50,174,99,.06)}

/* ---------- 分区 ---------- */
.section{margin-top:52px}
.section-head{display:flex;align-items:baseline;gap:12px;margin-bottom:20px;flex-wrap:wrap}
.section-head h2{font-family:var(--font-head);font-size:clamp(1.3rem,3vw,1.6rem);font-weight:700}
.section-head .tile{width:15px;height:15px;border-radius:5px;background:var(--c-secondary);transform:rotate(14deg);flex:none;box-shadow:var(--shadow-soft)}
.section-head .tile.t2{background:var(--c-primary);transform:rotate(-12deg)}
.section-head .tile.t3{background:var(--c-accent)}

/* ---------- 字母卡片墙 ---------- */
.letter-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(148px,1fr));gap:16px}
.letter-card{
  position:relative;display:block;text-align:center;
  background:var(--c-surface);border:1px solid var(--c-line);
  border-radius:var(--radius);padding:20px 12px 14px;
  box-shadow:var(--shadow-soft);
  transition:transform .18s,box-shadow .18s,border-color .18s;
  transform:rotate(var(--tilt,0deg));
}
.letter-card:nth-child(6n+1){--tilt:-1.6deg}
.letter-card:nth-child(6n+2){--tilt:1.4deg}
.letter-card:nth-child(6n+3){--tilt:-1deg}
.letter-card:nth-child(6n+4){--tilt:1.8deg}
.letter-card:nth-child(6n+5){--tilt:-1.2deg}
.letter-card:nth-child(6n){--tilt:1.1deg}
.letter-card:hover{transform:rotate(0) translateY(-6px);box-shadow:var(--shadow-lift);border-color:var(--c-accent)}
.letter-card:active{transform:scale(.96)}
.letter-card .big{font-family:var(--font-head);font-weight:700;font-size:3rem;line-height:1;display:block}
.letter-card .pic{font-size:1.8rem;margin:8px 0 2px;display:block;filter:drop-shadow(0 3px 4px rgba(27,44,34,.15))}
.letter-card .word{font-family:var(--font-head);font-weight:600;color:var(--c-muted);font-size:.92rem;display:block}
.letter-card .ring{position:absolute;top:10px;left:10px;width:26px;height:26px;border-radius:9px;background:var(--c-secondary);color:#fff;font-family:var(--font-head);font-size:.7rem;font-weight:700;display:grid;place-items:center;transform:rotate(-8deg);box-shadow:var(--shadow-soft)}
.learned-badge{
  position:absolute;top:-8px;right:-8px;font-size:1.15rem;
  filter:drop-shadow(0 3px 4px rgba(27,44,34,.25));
  animation:pop .4s ease;
}

/* ---------- 学习账本（家长视图） ---------- */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:16px}
.stat{
  background:var(--c-surface);border:1px solid var(--c-line);
  border-radius:var(--radius);padding:20px;
  box-shadow:var(--shadow-soft);transition:transform .18s,box-shadow .18s;
}
.stat:hover{transform:translateY(-3px);box-shadow:var(--shadow-lift)}
.stat .num{font-family:var(--font-head);font-weight:700;font-size:1.9rem;color:var(--c-primary)}
.stat .num span{font-size:1rem;color:var(--c-muted)}
.stat .lbl{color:var(--c-muted);font-size:.9rem;margin-top:2px}
.bar{height:12px;background:var(--c-line);border-radius:99px;overflow:hidden;margin-top:12px;box-shadow:var(--shadow-inset)}
.bar>i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--c-primary),var(--c-accent));border-radius:99px;transition:width .7s ease}
.progress-tip{
  margin-top:14px;background:rgba(159,75,190,.07);border:1px dashed var(--c-secondary);
  border-radius:var(--radius);padding:12px 16px;color:var(--c-muted);font-size:.9rem;
}
.row-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}

/* ---------- 详情页 ---------- */
.crumbs{display:flex;align-items:center;gap:8px;color:var(--c-muted);font-size:.9rem;margin-bottom:16px}
.crumbs a{color:var(--c-secondary);font-family:var(--font-head);font-weight:600}
.letter-hero{
  display:grid;grid-template-columns:1fr 1.05fr;gap:28px;align-items:center;
  background:var(--c-surface);border:1px solid var(--c-line);
  border-radius:28px;padding:34px 30px;box-shadow:var(--shadow-soft);
}
.letter-big-wrap{text-align:center}
.letter-clay{
  width:clamp(150px,30vw,210px);height:clamp(150px,30vw,210px);margin:0 auto;
  border-radius:50%;display:grid;place-items:center;
  background:radial-gradient(circle at 30% 24%,#eaffe9,var(--c-primary) 68%,#289a56);
  box-shadow:var(--shadow-lift),var(--shadow-inset);
  position:relative;
}
.letter-clay::after{ /* 高光 */
  content:"";position:absolute;width:46px;height:22px;border-radius:50%;
  background:rgba(255,255,255,.5);top:22%;left:22%;transform:rotate(-18deg);
}
.letter-clay .big{font-family:var(--font-head);font-weight:700;font-size:clamp(4.6rem,16vw,7rem);color:#fff;text-shadow:0 5px 12px rgba(27,44,34,.22)}
.speak-row{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-top:22px}
.letter-info h1{font-family:var(--font-head);font-weight:700;font-size:clamp(1.7rem,4vw,2.4rem)}
.letter-info .phon{font-family:var(--font-head);color:var(--c-muted);font-size:1.05rem;margin:2px 0 14px}
.word-chip{
  display:inline-flex;align-items:center;gap:12px;
  background:var(--c-bg);border:1px solid var(--c-line);
  border-radius:14px;padding:12px 18px;box-shadow:var(--shadow-inset);
  font-family:var(--font-head);font-weight:600;font-size:1.2rem;
}
.word-chip .pic{font-size:1.7rem}
.tip-box{
  margin-top:16px;background:rgba(45,210,193,.1);border:1px solid rgba(45,210,193,.4);
  border-radius:var(--radius);padding:14px 16px;font-size:.98rem;color:var(--c-text);
}
.tip-box b{color:var(--c-accent);font-family:var(--font-head)}
.example-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px}
.example-chip{
  display:flex;align-items:center;gap:10px;
  background:var(--c-surface);border:1px solid var(--c-line);
  border-radius:var(--radius);padding:14px 16px;text-align:left;
  font-family:var(--font-head);font-weight:600;font-size:1rem;
  box-shadow:var(--shadow-soft);transition:transform .15s,box-shadow .15s,border-color .15s;
}
.example-chip:hover{transform:translateY(-3px) rotate(-1deg);box-shadow:var(--shadow-lift);border-color:var(--c-primary)}
.example-chip:active{transform:scale(.96)}
.example-chip .ltr{width:38px;height:38px;border-radius:11px;background:rgba(50,174,99,.12);color:var(--c-primary);display:grid;place-items:center;font-size:1.2rem;flex:none}
.example-chip .vol{margin-left:auto;color:var(--c-muted);font-size:1rem}
.letter-actions{display:flex;gap:12px;justify-content:center;margin-top:30px;flex-wrap:wrap}
.nav-letters{display:flex;justify-content:space-between;gap:12px;margin-top:26px;flex-wrap:wrap}

/* ---------- 游戏页 ---------- */
.game-intro{text-align:center;margin-bottom:22px}
.game-intro h1{font-family:var(--font-head);font-weight:700;font-size:clamp(1.6rem,4vw,2.2rem)}
.game-intro p{color:var(--c-muted);margin-top:6px}
.tabs{display:flex;gap:10px;margin-bottom:22px;flex-wrap:wrap;justify-content:center}
.tab{
  padding:11px 20px;border-radius:14px;
  font-family:var(--font-head);font-weight:600;font-size:1rem;color:var(--c-muted);
  background:var(--c-surface);border:2px solid var(--c-line);box-shadow:var(--shadow-soft);
  transition:all .18s;
}
.tab:hover{border-color:var(--c-accent);color:var(--c-text);transform:translateY(-2px)}
.tab.active{background:var(--c-primary);color:#fff;border-color:var(--c-primary);box-shadow:var(--shadow-soft)}
.game-card{
  background:var(--c-surface);border:1px solid var(--c-line);
  border-radius:28px;padding:26px 22px;box-shadow:var(--shadow-soft);
}
.game-bar{display:flex;justify-content:space-between;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:18px;font-family:var(--font-head);color:var(--c-muted);font-size:.95rem}
.game-bar .moves{background:var(--c-bg);border:1px solid var(--c-line);padding:5px 12px;border-radius:99px;box-shadow:var(--shadow-inset)}

/* 配对：翻牌 */
.card-table{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;max-width:660px;margin:0 auto}
.ptile{perspective:900px;aspect-ratio:1/1;border-radius:var(--radius)}
.ptile .inner{position:relative;width:100%;height:100%;transform-style:preserve-3d;transition:transform .5s}
.ptile.flip .inner{transform:rotateY(180deg)}
.ptile .face{
  position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;
  border-radius:var(--radius);display:grid;place-items:center;
  box-shadow:var(--shadow-soft);border:2px solid var(--c-line);
}
.ptile .back{
  background:linear-gradient(135deg,var(--c-primary),var(--c-accent));
  color:#fff;font-family:var(--font-head);font-weight:700;font-size:2rem;
  background-image:radial-gradient(circle at 30% 25%,rgba(255,255,255,.28),transparent 45%);
}
.ptile .front{
  background:var(--c-surface);transform:rotateY(180deg);
  display:flex;flex-direction:column;gap:2px;
  font-family:var(--font-head);
}
.ptile .front .pic{font-size:2.2rem;filter:drop-shadow(0 3px 4px rgba(27,44,34,.15))}
.ptile .front .big{font-size:2.8rem;font-weight:700;color:var(--c-text)}
.ptile .front small{color:var(--c-muted);font-weight:600;font-size:.8rem}
.ptile.matched .front{border-color:var(--c-primary);background:#f0faf3;animation:pop .35s ease}
.ptile.wrong .inner{animation:shake .4s}
.ptile.wrong .front{border-color:#e25f5f}
.game-center{display:flex;justify-content:center;margin-top:24px}

/* 排序 */
.order-hint{text-align:center;color:var(--c-muted);font-family:var(--font-head);font-size:.9rem;margin:6px 0 16px}
.order-row{display:flex;gap:10px;min-height:92px;align-items:center;justify-content:center;flex-wrap:wrap;padding:12px 4px;margin-bottom:6px}
.order-slot{
  width:70px;height:70px;border-radius:16px;
  background:var(--c-surface);border:2px dashed var(--c-accent);
  display:grid;place-items:center;font-family:var(--font-head);font-weight:700;font-size:1.9rem;color:var(--c-accent);
  box-shadow:var(--shadow-inset);transition:all .25s;
}
.order-slot.filled{border-style:solid;background:var(--c-primary);color:#fff;animation:pop .35s ease}
.order-tray{
  display:flex;gap:12px;flex-wrap:wrap;justify-content:center;
  padding:22px;background:var(--c-bg);border:2px dashed var(--c-line);
  border-radius:var(--radius);box-shadow:var(--shadow-inset);
}
.order-tile{
  width:76px;height:86px;border-radius:16px;
  background:var(--c-surface);border:2px solid var(--c-line);
  display:grid;place-items:center;font-family:var(--font-head);font-weight:700;font-size:2rem;
  box-shadow:var(--shadow-soft);transition:transform .15s,box-shadow .15s,border-color .15s;
}
.order-tile:hover{transform:translateY(-4px) rotate(-2deg);border-color:var(--c-accent);box-shadow:var(--shadow-lift)}
.order-tile:active{transform:scale(.94)}
.order-tile.shake{animation:shake .4s}

/* ---------- 弹窗 ---------- */
.modal-backdrop{
  position:fixed;inset:0;background:rgba(27,44,34,.45);z-index:100;
  display:grid;place-items:center;padding:20px;
  opacity:0;pointer-events:none;transition:opacity .25s;
}
.modal-backdrop.show{opacity:1;pointer-events:auto}
.modal{
  background:var(--c-surface);border-radius:24px;padding:32px 36px;text-align:center;
  box-shadow:var(--shadow-lift);max-width:400px;width:100%;
  transform:scale(.85) translateY(10px);transition:transform .25s;
}
.modal-backdrop.show .modal{transform:scale(1) translateY(0)}
.modal-icon{font-size:3rem;animation:bounce 1.2s ease infinite}
.modal-title{font-family:var(--font-head);font-weight:700;font-size:1.5rem;margin:8px 0 6px}
.modal-body p{color:var(--c-muted);margin:3px 0}
.modal .btn{margin-top:18px}

/* ---------- Toast ---------- */
.toast{
  position:fixed;left:50%;bottom:30px;transform:translateX(-50%) translateY(16px);
  background:var(--c-text);color:#fff;padding:11px 20px;border-radius:12px;
  font-family:var(--font-head);font-size:.95rem;z-index:120;
  opacity:0;pointer-events:none;transition:opacity .3s,transform .3s;box-shadow:var(--shadow-lift);
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ---------- 纸屑 ---------- */
.confetti{position:fixed;top:-16px;z-index:200;pointer-events:none;border-radius:3px;animation:confettiFall linear forwards}

/* ---------- 页脚 ---------- */
.site-footer{position:relative;z-index:1;text-align:center;padding:0 20px 40px;color:var(--c-muted);font-size:.9rem}
.tile-strip{
  display:flex;justify-content:center;gap:8px;margin-bottom:16px;flex-wrap:wrap;
}
.tile-strip i{width:16px;height:16px;border-radius:5px;display:inline-block;box-shadow:var(--shadow-soft);opacity:.85}
.tile-strip i:nth-child(3n+1){background:var(--c-primary);transform:rotate(14deg)}
.tile-strip i:nth-child(3n+2){background:var(--c-secondary);transform:rotate(-10deg)}
.tile-strip i:nth-child(3n){background:var(--c-accent);transform:rotate(8deg)}

/* ---------- 动画 ---------- */
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-9px)}}
@keyframes pop{0%{transform:scale(.6)}60%{transform:scale(1.12)}100%{transform:scale(1)}}
@keyframes shake{0%,100%{transform:translateX(0)}20%{transform:translateX(-7px)}40%{transform:translateX(7px)}60%{transform:translateX(-5px)}80%{transform:translateX(5px)}}
@keyframes bounce{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
@keyframes confettiFall{0%{transform:translateY(-20px) rotate(0);opacity:1}100%{transform:translateY(110vh) rotate(720deg);opacity:.35}}

/* ---------- 响应式 ---------- */
@media (max-width:760px){
  .letter-hero{grid-template-columns:1fr;padding:26px 18px}
  .card-table{gap:10px}
  .ptile .front .pic{font-size:1.7rem}
  .ptile .front .big{font-size:2rem}
  .header-inner{padding:10px 14px;gap:10px}
  .brand{font-size:1.05rem}
  .order-tile{width:62px;height:70px;font-size:1.6rem}
  .order-slot{width:58px;height:58px;font-size:1.5rem}
}
@media (max-width:430px){
  .card-table{grid-template-columns:repeat(4,1fr);gap:8px}
  .ptile .front small{font-size:.68rem}
  .hero{padding:36px 18px 32px}
  .hero-sticker{display:none}
}
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  html{scroll-behavior:auto}
}