/* hanzi 视觉规范 v1 — 与拼音站同源 */
:root{
  --bg: #f5f1e8;
  --card: #ffffff;
  --ink: #232323;
  --ink-2: #5f6368;
  --primary: #1a73e8;
  --warn: #d97706;
  --green: #188038;
  --yellow: #f9ab00;
  --red: #d93025;
  --line: #e8e2d4;
  --shadow: 0 1px 6px rgba(0,0,0,.08);
  --shadow-hi: 0 4px 16px rgba(0,0,0,.10);
  --radius-card: 16px;
  --radius-btn: 12px;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  min-height:100vh;
  padding-bottom: env(safe-area-inset-bottom);
}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
button{font: inherit; color: inherit; cursor: pointer;}

/* 通用吸顶头 + 字体族双写兼容 */
header.site{
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--card);
  border-bottom: 1px solid var(--line);
  box-shadow: var(--shadow);
}
header.site .bar{
  display:flex; align-items:center; gap:12px;
  padding: 12px 16px;
  min-height: 56px;
}
header.site h1{
  font-size: 20px; font-weight: 600; margin: 0;
  flex: 1;
}
header.site nav{display:flex; gap:8px; flex-wrap:wrap}
header.site nav a{
  display:inline-flex; align-items:center; justify-content:center;
  /* 视觉规范铁律：触摸目标 ≥48px（原来 40px，iPad 实测不达标，已按 spec 调齐） */
  min-height: 48px; padding: 0 14px;
  border-radius: var(--radius-btn);
  border: 1px solid transparent;
}
header.site nav a.on{
  background: var(--primary); color:#fff;
  border-color: var(--primary);
}

/* 容器 */
main{padding: 12px 16px 32px; max-width: 1100px; margin: 0 auto;}
section + section{margin-top: 16px;}

/* ============== index：12 册格子入口 ============== */
.books-grid{
  display:grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
}
.book-tile{
  background: var(--card);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow);
  padding: 16px 12px;
  min-height: 96px;
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  border: 1px solid transparent;
  transition: transform .15s ease, box-shadow .15s ease;
}
.book-tile:active{transform: scale(.98)}
.book-tile .num{font-size: 24px; font-weight: 700; color: var(--primary);}
.book-tile .ttl{font-size: 13px; color: var(--ink-2); margin-top: 4px; text-align:center}
.book-tile.empty{opacity:.55}

.quiz-today{
  background: var(--card);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow);
  padding: 16px;
  display:flex; align-items:center; gap: 12px;
  border: 1px solid var(--line);
}
.quiz-today .ico{
  width:48px; height:48px; border-radius:50%;
  background: var(--primary); color:#fff;
  display:flex; align-items:center; justify-content:center; font-size:20px;
}
.quiz-today .txt{flex:1}
.quiz-today .ttl{font-weight:600}
.quiz-today .sub{font-size:13px; color:var(--ink-2)}
.quiz-today .go{
  min-height:48px; min-width:88px;
  border-radius: var(--radius-btn);
  border: 1px solid var(--primary);
  background:#fff; color: var(--primary); font-weight:600;
  display:inline-flex; align-items:center; justify-content:center; padding:0 18px;
}
.quiz-today .go.on{background:var(--primary); color:#fff}

/* ============== 通用：筛选器（卡片墙顶部吸顶第二行） ============== */
.filter-bar{
  position: -webkit-sticky;
  position: sticky;
  top: 56px;
  z-index: 15;
  background: var(--bg);
  padding: 10px 0 12px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 12px;
}
.filter-row{display:flex; gap:8px; align-items:center; margin-bottom:6px;}
.filter-row .label{font-size:13px; color:var(--ink-2); min-width:48px;}
.chip-row{display:flex; gap:8px; flex-wrap:wrap;}
.chip{
  min-height: 48px;
  padding: 0 14px;
  border-radius: var(--radius-btn);
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  display:inline-flex; align-items:center; gap:6px;
  position: relative;
}
.chip input[type=radio]{
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}
.chip:has(input:checked),
.chip.on{
  background: var(--primary); color:#fff; border-color: var(--primary);
}
.chip .dot{
  width:10px; height:10px; border-radius:50%; display:inline-block; background: var(--ink-2);
}
.chip[data-lamp="red"] .dot{background: var(--red);}
.chip[data-lamp="yellow"] .dot{background: var(--yellow);}
.chip[data-lamp="green"] .dot{background: var(--green);}

/* ============== cards：卡片墙 ============== */
.card-grid{
  display:grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
}
.flash{
  perspective: 1000px;
  position: relative;
}
.flash .inner{
  position: relative;
  width: 100%;
  min-height: 200px;
  transform-style: preserve-3d;
  transition: transform .45s ease;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow);
  background: var(--card);
}
.flash.is-flipped .inner{transform: rotateY(180deg);}
.flash .face{
  position:absolute; inset:0;
  -webkit-backface-visibility: hidden; backface-visibility: hidden;
  display:flex; flex-direction:column;
  padding: 14px;
  border-radius: var(--radius-card);
  background: var(--card);
  overflow: hidden;
}
.flash .back{transform: rotateY(180deg);}
.flash .char{
  font-family: "KaiTi","Kaiti SC","STKaiti",serif;
  font-size: clamp(96px, 28vw, 160px);
  line-height: 1;
  text-align:center;
  flex: 1;
  display:flex; align-items:center; justify-content:center;
}
.flash .meta{
  display:flex; justify-content:space-between; align-items:center;
  font-size: 13px; color: var(--ink-2);
}
.flash .lamp-dot{
  width: 12px; height:12px; border-radius:50%;
  border: 2px solid var(--ink-2);
  background: transparent;
  cursor: pointer;
}
.flash .lamp-dot[data-lamp="red"]{border-color: var(--red); background: var(--red);}
.flash .lamp-dot[data-lamp="yellow"]{border-color: var(--yellow); background: var(--yellow);}
.flash .lamp-dot[data-lamp="green"]{border-color: var(--green); background: var(--green);}
/* 背面 */
.flash .back{padding: 14px;}
.flash .pinyin{
  font-size: clamp(28px, 8vw, 40px);
  font-weight: 600;
  text-align:center;
  margin: 4px 0 10px;
}
.flash .meaning{font-size:16px; line-height:1.5; margin-bottom:8px;}
.flash .group{
  font-size: 14px; color: var(--ink-2);
  margin-bottom: 4px;
}
.flash .group b{color: var(--ink); font-weight:600;}
.flash .sentence{
  font-size: 16px; line-height:1.5;
  background: #fbf7ec;
  border-left: 3px solid var(--warn);
  padding: 8px 10px;
  border-radius: 6px;
  margin-top: 6px;
}
.flash .write-btn{
  margin-top: 8px;
  align-self: flex-start;
  min-height: 40px;
  padding: 0 12px;
  border-radius: 8px;
  border: 1px solid var(--primary);
  background:#fff; color: var(--primary);
  font-size: 14px;
}
.flash .writer{
  display:none;
  margin-top: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 6px;
}
.flash .writer.open{display:block;}
.flash .writer svg{max-width:100%; height:auto; display:block; margin:0 auto;}
.flash .writer-tools{
  display:flex; gap:6px; justify-content:flex-end; margin-top:4px;
}
.flash .writer-tools button{
  min-height: 36px; padding: 0 10px; font-size:13px;
  border-radius: 8px; border:1px solid var(--line); background:#fff;
}

/* ============== quiz：一屏一题 ============== */
.quiz-stage{
  background: var(--card);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow);
  padding: 24px 16px;
  margin-top: 12px;
}
.quiz-prompt{
  text-align:center;
  margin-bottom: 16px;
}
.quiz-prompt .qmark{
  font-size: 13px; color: var(--ink-2);
}
.quiz-prompt .big{
  font-family: "KaiTi","Kaiti SC","STKaiti",serif;
  font-size: clamp(96px, 28vw, 160px);
  line-height: 1.1;
  display:inline-flex; align-items:center; justify-content:center;
  width: 1.2em; height: 1.2em;
  border-radius: 12px;
  background: var(--bg);
}
.quiz-prompt .big[data-feedback="green"]{box-shadow: 0 0 0 4px var(--green) inset; color: var(--green);}
.quiz-prompt .big[data-feedback="red"]{box-shadow: 0 0 0 4px var(--red) inset; color: var(--red);}
.quiz-options{
  display:grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.quiz-options .opt{
  min-height: 64px;
  border-radius: var(--radius-card);
  border: 1px solid var(--line);
  background: #fff;
  font-family: "KaiTi","Kaiti SC","STKaiti",serif;
  font-size: clamp(28px, 7vw, 40px);
  font-weight: 600;
  display:flex; align-items:center; justify-content:center;
  padding: 8px;
  transition: transform .1s ease, background .2s ease, border-color .2s ease;
}
.quiz-options .opt:active{transform: scale(.98)}
.quiz-options .opt.correct{background: #e6f4ea; border-color: var(--green); color: var(--green);}
.quiz-options .opt.wrong{background: #fce8e6; border-color: var(--red); color: var(--red);}
.quiz-options .opt[disabled]{pointer-events:none; opacity:.85}
.quiz-progress{
  display:flex; justify-content:space-between; align-items:center;
  margin: 16px 0 8px;
  font-size: 13px; color: var(--ink-2);
}
.quiz-progress .lamp{
  width:10px; height:10px; border-radius:50%; display:inline-block;
  background: transparent; border: 2px solid var(--ink-2); margin-right:6px;
}
.quiz-progress .lamp.red{background: var(--red); border-color: var(--red);}
.quiz-progress .lamp.yellow{background: var(--yellow); border-color: var(--yellow);}
.quiz-progress .lamp.green{background: var(--green); border-color: var(--green);}

/* 通用：横屏溢出保险 */
html, body { overflow-x: hidden; }
img, svg { max-width: 100%; }

/* 小屏：测验选项两列过窄时回到一列 */
@media (max-width: 360px){
  .quiz-options{grid-template-columns: 1fr;}
}

/* ============================================================
   M1 新增：维度归类浏览
   ============================================================ */

/* 小节标题 */
.sec-title{
  font-size: 16px; font-weight: 600; margin: 4px 0 10px;
  display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap;
}
.sec-title .sub{font-size: 13px; font-weight: 400; color: var(--ink-2)}

/* 维度切换条：小屏可横滑，别把按钮压扁 */
.dim-row{align-items: flex-start}
#dim-bar{
  flex-wrap: nowrap; overflow-x: auto; -webkit-overflow-scrolling: touch;
  padding-bottom: 2px; max-width: 100%;
}
#dim-bar .chip{flex: 0 0 auto}
#value-bar{max-height: 108px; overflow-y: auto}

/* 按钮式 chip（v2 用 button，不再靠 radio） */
button.chip{border: 1px solid var(--line); background: #fff; color: var(--ink)}
button.chip.on{background: var(--primary); color: #fff; border-color: var(--primary)}
button.chip.dim{font-weight: 600}
button.chip.disabled{opacity: .45; cursor: not-allowed}
.chip .tag{
  font-size: 11px; padding: 1px 5px; border-radius: 6px;
  background: var(--line); color: var(--ink-2); margin-left: 2px;
}
button.chip.on .tag{background: rgba(255,255,255,.28); color:#fff}
/* 取值按钮上的字数 */
.chip .cnt{
  font-size: 11px; color: var(--ink-2); background: var(--bg);
  border-radius: 6px; padding: 1px 5px; margin-left: 2px;
}
button.chip.on .cnt{background: rgba(255,255,255,.28); color:#fff}

/* 当前范围一句话 */
.scope{font-size: 13px; color: var(--ink-2); margin-top: 4px}

/* 分组 */
.dim-group{margin: 18px 0 6px}
.group-head{
  font-size: 15px; font-weight: 600; margin: 0 0 8px;
  display: flex; align-items: baseline; gap: 8px;
  padding-bottom: 6px; border-bottom: 1px solid var(--line);
}
.group-head .gcount{font-size: 12px; font-weight: 400; color: var(--ink-2)}

/* 卡片密一点：3772 字要能扫得动 */
.card-grid{grid-template-columns: repeat(auto-fill, minmax(132px, 1fr)); gap: 10px}
.flash .inner{min-height: 176px}
.flash .char{font-size: clamp(64px, 20vw, 104px)}
.flash .back .pinyin{font-size: clamp(22px, 6vw, 30px); margin: 2px 0 6px}
.flash .meaning{font-size: 13px}
.flash .group{font-size: 12px}
.flash .sentence{font-size: 13px; padding: 6px 8px}
.flash .write-btn{min-height: 36px; font-size: 13px}

/* 加载更多 */
.load-more{
  display: block; width: 100%; margin: 10px 0 4px;
  min-height: 48px; border-radius: var(--radius-btn);
  border: 1px dashed var(--line); background: #fff; color: var(--primary);
}
.load-cards{width: auto; margin: 8px 0 0}

/* 空态 / 错误 / 小注 */
.empty-note, .note{color: var(--ink-2); font-size: 13px; padding: 8px 0}
.load-error{color: var(--red); padding: 16px; white-space: pre-wrap}

/* 出题页范围条 */
.quiz-scope-bar{
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  font-size: 13px; color: var(--ink-2); margin: 4px 0 0;
}
.quiz-scope-bar #quiz-scope{flex: 1; min-width: 200px}
.quiz-done{text-align: center; padding: 16px 4px}
.quiz-done h2{margin: 4px 0}
.wrong-list{text-align: left; margin: 12px 0}
.wrong-list .chips{display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px}
.wrong-chip{flex-direction: column; gap: 2px; min-height: 56px}
.wrong-chip .py{font-size: 12px; opacity: .8}
.done-actions{
  display: flex; gap: 10px; justify-content: center; align-items: center;
  flex-wrap: wrap; margin-top: 12px;
}
.done-actions #restart{
  min-height: 48px; padding: 0 20px; border-radius: var(--radius-btn);
  border: 1px solid var(--primary); background: var(--primary); color: #fff; font-weight: 600;
}

/* ============================================================
   M4 家长模式
   ============================================================ */
.pin-row{display:flex; gap:10px; align-items:center; flex-wrap:wrap; margin: 8px 0}
.pin-row input{
  min-height: 48px; width: 160px; padding: 0 12px; font-size: 20px; letter-spacing: 4px;
  border-radius: var(--radius-btn); border: 1px solid var(--line); background:#fff; color: var(--ink);
}
.pin-row button{
  min-height: 48px; padding: 0 20px; border-radius: var(--radius-btn);
  border: 1px solid var(--primary); background: var(--primary); color:#fff; font-weight: 600;
}
.bulk-actions{justify-content: flex-start}
.bulk-actions button{
  min-height: 48px; padding: 0 16px; border-radius: var(--radius-btn);
  border: 1px solid var(--line); background:#fff;
}
.done-actions button.danger{border-color: var(--red); color: var(--red)}
.pchar{
  flex-direction: column; gap: 2px;
  min-height: 64px; min-width: 64px; font-size: 22px;
  font-family: "KaiTi","Kaiti SC","STKaiti",serif;
}
.pchar .lv{font-size: 11px; font-family: -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}
.pchar.lv-hard{border-color: var(--red)}
.pchar.lv-ok{border-color: var(--yellow)}
.pchar.lv-known{border-color: var(--green)}

/* ============================================================
   M5 出题器
   ============================================================ */
.quiz-setup{
  background: var(--card); border-radius: var(--radius-card); box-shadow: var(--shadow);
  padding: 14px 12px; margin-top: 8px;
}
.quiz-setup .filter-row{align-items: flex-start}
.select-row{display:flex; gap:8px; flex-wrap:wrap; flex:1}
.select-row select{
  min-height: 48px; padding: 0 10px; font-size: 15px; max-width: 100%;
  border-radius: var(--radius-btn); border: 1px solid var(--line); background:#fff; color: var(--ink);
}
.primary-btn{
  min-height: 48px; padding: 0 22px; border-radius: var(--radius-btn);
  border: 1px solid var(--primary); background: var(--primary); color:#fff; font-weight: 600; font-size: 16px;
}
/* 题干（释义做题干时用文字，不是大字） */
.quiz-prompt .stem{
  font-size: clamp(17px, 4.6vw, 22px); line-height: 1.5; margin: 8px auto 0; max-width: 34em;
  background: var(--bg); border-radius: 12px; padding: 12px 14px;
}
.quiz-prompt .stem[data-feedback="green"]{box-shadow: 0 0 0 3px var(--green) inset;}
.quiz-prompt .stem[data-feedback="red"]{box-shadow: 0 0 0 3px var(--red) inset;}
/* 拼音选项：不能用楷体大字，改用常规字体小一号 */
.quiz-options.pinyin-options .opt{
  font-family: -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  font-size: clamp(18px, 5vw, 24px); font-weight: 600; letter-spacing: .5px;
}
.quiz-tools{display:flex; justify-content:center; margin-top: 12px}
.quiz-tools button{
  min-height: 40px; padding: 0 14px; border-radius: 8px; font-size: 13px;
  border: 1px solid var(--line); background:#fff; color: var(--ink-2);
}

/* ============================================================
   页脚：数据流向声明（每个页面都有；未成年人数据从严）
   ============================================================ */
.site-foot{
  margin: 28px 0 8px; padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 12px; line-height: 1.7; color: var(--ink-2);
}
.site-foot b{color: var(--ink)}