/* ===== 童趣配色 ===== */
:root{
  --bg:#FFF7EC;
  --panel:#FFFFFF;
  --primary:#FF8A3D;      /* 暖橙 */
  --primary-d:#F2721B;
  --teal:#1FB6A6;         /* 青 */
  --yellow:#FFC83D;       /* 黄 */
  --pink:#FF6B8A;
  --ink:#3A3530;
  --muted:#9A9289;
  --line:#F0E6D6;
  --shadow:0 6px 20px rgba(255,138,61,.15);
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;height:100%;}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;
  background:var(--bg);color:var(--ink);
  -webkit-font-smoothing:antialiased;
}

/* ===== 顶栏 ===== */
.topbar{
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;
  padding:12px 20px;background:linear-gradient(100deg,var(--primary),var(--yellow));
  color:#fff;box-shadow:var(--shadow);
}
.logo{font-size:20px;font-weight:800;letter-spacing:1px;}
.sub{font-size:13px;opacity:.95;}
.link-go{
  margin-left:auto;color:#fff;font-size:13px;font-weight:700;text-decoration:none;
  background:rgba(255,255,255,.22);border:1px solid rgba(255,255,255,.45);
  padding:7px 14px;border-radius:14px;white-space:nowrap;transition:background .15s;
}
.link-go:hover{background:rgba(255,255,255,.38);}
@media print{.link-go{display:none;}}

/* ===== 布局 ===== */
.layout{display:flex;gap:16px;padding:16px;align-items:flex-start;}
.sidebar{
  flex:0 0 320px;width:320px;background:var(--panel);border-radius:18px;
  padding:16px;box-shadow:var(--shadow);align-self:stretch;
  display:flex;flex-direction:column;gap:14px;max-height:calc(100vh - 110px);
}
.main{flex:1;min-width:0;display:flex;flex-direction:column;gap:14px;}

/* ===== 选择块 ===== */
.sel-block{display:flex;flex-direction:column;gap:8px;}
.sel-block.grow{flex:1;min-height:0;overflow:hidden;display:flex;flex-direction:column;}
.sel-label{font-size:13px;font-weight:700;color:var(--ink);display:flex;justify-content:space-between;align-items:center;}
.sel-label .cnt{font-size:12px;font-weight:600;color:var(--teal);background:#E6F7F4;padding:2px 8px;border-radius:10px;}

/* ===== chips ===== */
.chips{display:flex;flex-wrap:wrap;gap:8px;}
.chip{
  border:2px solid var(--line);background:#FFFDF9;color:var(--ink);
  padding:7px 13px;border-radius:14px;font-size:14px;cursor:pointer;
  transition:.15s;user-select:none;font-weight:600;
}
.chip:hover{border-color:var(--primary);}
.chip.on{background:var(--primary);border-color:var(--primary);color:#fff;box-shadow:0 3px 10px rgba(255,138,61,.35);}
.chip.dis{opacity:.4;cursor:not-allowed;text-decoration:line-through;}

/* ===== 树 ===== */
.tree{flex:1;overflow:auto;margin-top:4px;padding-right:4px;}
.unit{border:2px solid var(--line);border-radius:14px;margin-bottom:10px;overflow:hidden;background:#FFFDF9;}
.unit-head{
  display:flex;align-items:center;gap:8px;padding:10px 12px;cursor:pointer;
  background:linear-gradient(90deg,#FFF3E2,#FFFDF9);font-weight:700;font-size:14px;
}
.unit-head .arrow{transition:.2s;color:var(--primary);font-size:12px;}
.unit.open .arrow{transform:rotate(90deg);}
.unit-head .all{margin-left:auto;font-size:12px;color:var(--teal);font-weight:600;}
.lessons{display:none;padding:6px 10px 10px;}
.unit.open .lessons{display:block;}
.lesson{
  display:flex;align-items:center;gap:8px;padding:7px 8px;border-radius:10px;cursor:pointer;font-size:14px;
}
.lesson:hover{background:#FFF3E2;}
.lesson input{width:16px;height:16px;accent-color:var(--primary);}
.lesson.on{color:var(--primary-d);font-weight:700;}

/* 英语单元：整单元可直接勾选 */
.en-unit{
  display:flex;align-items:center;gap:8px;padding:10px 12px;margin-bottom:8px;
  border:2px solid #FFE3B3;border-radius:14px;background:#FFF7E9;cursor:pointer;font-size:14px;font-weight:600;
}
.en-unit.on{background:#FFE9CC;border-color:#FFB661;color:var(--primary-d);}
.en-unit input{width:16px;height:16px;accent-color:var(--primary);}
.en-name{flex:1;}
.en-cnt{font-size:12px;color:#B5832E;font-weight:600;}

/* ===== 工具栏 ===== */
.toolbar{background:var(--panel);border-radius:18px;padding:14px 16px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:12px;}
.tb-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;}
.tb-label{font-size:13px;font-weight:700;min-width:56px;}
.tb-hint{font-size:12px;color:var(--muted);}
#totalInput{width:84px;padding:7px 10px;border:2px solid var(--line);border-radius:12px;font-size:15px;font-weight:700;text-align:center;color:var(--ink);}
#totalInput:focus{outline:none;border-color:var(--primary);}
.chk{font-size:13px;display:flex;align-items:center;gap:5px;cursor:pointer;font-weight:600;}
.chk input{width:16px;height:16px;accent-color:var(--teal);}
.btns{justify-content:flex-end;}
.btn{
  border:none;border-radius:14px;padding:10px 18px;font-size:15px;font-weight:700;cursor:pointer;
  background:#F3ECE1;color:var(--ink);transition:.15s;
}
.btn:hover{transform:translateY(-1px);}
.btn.primary{background:linear-gradient(100deg,var(--primary),var(--primary-d));color:#fff;box-shadow:0 4px 14px rgba(255,138,61,.4);}
.btn.ghost{background:transparent;border:2px solid var(--line);}
.btn.accent{background:linear-gradient(100deg,var(--teal),#159B8D);color:#fff;box-shadow:0 4px 14px rgba(31,182,166,.4);}

/* ===== 纸张 ===== */
.paper-wrap{flex:1;overflow:auto;display:flex;justify-content:center;padding:6px;}
.paper{
  width:794px;min-height:1123px;background:#fff;border-radius:6px;
  box-shadow:0 8px 30px rgba(0,0,0,.12);padding:54px 56px;
  background-image:repeating-linear-gradient(transparent,transparent 39px,#F3F3F3 40px);
  position:relative;
}
.paper-empty{color:var(--muted);text-align:center;margin-top:200px;font-size:16px;line-height:2;background:none!important;box-shadow:none!important;}

/* 试卷内容 */
.p-title{font-size:22px;font-weight:800;text-align:center;margin-bottom:4px;color:var(--ink);}
.p-meta{font-size:13px;color:var(--muted);text-align:center;margin-bottom:18px;}
.p-list{list-style:none;margin:0;padding:0;counter-reset:q;}
.p-item{display:flex;align-items:flex-start;gap:10px;margin-bottom:18px;font-size:16px;line-height:1.5;}
.p-item .num{counter-increment:q;flex:0 0 22px;color:var(--primary);font-weight:700;}
.p-item .num::before{content:counter(q) ".";}
.p-item .body{flex:1;}
.p-item .ans{color:var(--teal);font-weight:700;margin-left:8px;}
.p-blank{display:inline-block;border-bottom:2px solid #555;min-width:54px;height:22px;vertical-align:-6px;margin:0 4px;}
.ans-key{margin-top:26px;border-top:3px dashed var(--line);padding-top:16px;}
.ans-key h4{margin:0 0 10px;color:var(--teal);font-size:15px;}
.ans-key .ak{font-size:14px;line-height:1.9;color:#666;}

/* ===== 练字 / 描红纸（田字格 + 四线三格） ===== */
.copy-paper{display:flex;flex-direction:column;gap:4px;margin-top:6px;}
.zi-block,.en-block{padding:8px 4px;border-bottom:1px dashed #F0E6D6;page-break-inside:avoid;}
.zi-block:last-child,.en-block:last-child{border-bottom:none;}

/* 示范大字行：开头给孩子看正确写法 */
.model-line{display:flex;align-items:baseline;gap:10px;margin:2px 0 10px;padding:8px 12px;background:#FAF6EF;border-radius:12px;page-break-inside:avoid;}
.model-char{font-size:44px;font-weight:800;color:var(--ink);line-height:1;}
.model-py{font-size:18px;color:var(--teal);font-weight:700;}
.model-en{font-size:32px;font-weight:800;color:var(--ink);}
.model-zh{font-size:15px;color:var(--muted);font-weight:600;}
.model-tip{margin-left:auto;font-size:12px;color:var(--muted);}

/* 拼音行（浅灰描红，供照抄） */
.py-row{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:5px;}
.py-cell{
  width:56px;height:24px;display:flex;align-items:center;justify-content:center;
  font-size:14px;color:#c4c4c4;border-bottom:1px dashed #e2e2e2;
}

/* 田字格：浅灰十字，适合黑白激光打印 */
.tzg-row{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px;}
.tzg{
  width:56px;height:56px;display:inline-flex;align-items:center;justify-content:center;
  border:1px solid #d2d2d2;border-radius:3px;
  background-color:#fff;
  background-image:
    linear-gradient(to right, transparent calc(50% - 0.6px), #e6e6e6 calc(50% - 0.6px), #e6e6e6 calc(50% + 0.6px), transparent calc(50% + 0.6px)),
    linear-gradient(to bottom, transparent calc(50% - 0.6px), #e6e6e6 calc(50% - 0.6px), #e6e6e6 calc(50% + 0.6px), transparent calc(50% + 0.6px));
  font-size:30px;font-weight:700;color:#c6c6c6;
}
.tzg.faint{color:#c6c6c6;}   /* 描红：浅灰字，孩子描着写 */
.tzg:not(.faint){color:transparent;}

/* 英语四线三格：浅灰四条线 */
.eline-row{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:12px;}
.eline{
  min-width:104px;height:42px;padding:0 8px;display:inline-flex;align-items:center;justify-content:center;
  border:1px solid #e3e3e3;border-radius:4px;background-color:#fff;white-space:nowrap;
  background-image:
    linear-gradient(#e6e6e6,#e6e6e6),
    linear-gradient(#e6e6e6,#e6e6e6),
    linear-gradient(#e6e6e6,#e6e6e6),
    linear-gradient(#e6e6e6,#e6e6e6);
  background-repeat:no-repeat;
  background-size:100% 1px,100% 1px,100% 1px,100% 1px;
  background-position:0 0,0 33.33%,0 66.66%,0 100%;
  font-size:19px;font-weight:600;color:#c6c6c6;
  print-color-adjust:exact;-webkit-print-color-adjust:exact;
}
.eline.faint{color:#c6c6c6;}  /* 描红 */

/* ===== 手机 ===== */
.mobilebar{display:none;}
@media(max-width:860px){
  .layout{flex-direction:column;padding:10px;}
  .sidebar{flex:none;width:100%;max-height:none;}
  .tree{max-height:340px;}
  .toolbar .btns{justify-content:flex-start;}
  .paper{width:100%;min-height:auto;padding:26px 20px;background-image:none;}
  .mobilebar{
    display:flex;gap:10px;position:sticky;bottom:0;padding:10px 14px;
    background:#fff;box-shadow:0 -4px 16px rgba(0,0,0,.08);
  }
  .mobilebar .btn{flex:1;}
}

/* ===== 打印 ===== */
@media print{
  .topbar,.sidebar,.toolbar,.mobilebar{display:none!important;}
  body{background:#fff;}
  .layout{padding:0;display:block;}
  .paper-wrap{display:block;padding:0;}
  .paper{width:auto;min-height:auto;box-shadow:none;background-image:none;padding:0;}
  .paper-empty{display:none;}
  .p-blank{border-bottom:1px solid #000;}
  /* 田字格 / 四线三格的浅灰线必须打印出来（否则激光打印只剩空白格） */
  .tzg,.eline,.py-cell,.model-line{print-color-adjust:exact;-webkit-print-color-adjust:exact;}
  @page{size:A4;margin:14mm;}
}