/* ============================================================
   小学生硬笔书法练习库 · 全站样式
   视觉规范：稳重蓝调卡片化布局（按指定色值）、细描边、克制动效
   ============================================================ */

:root{
  --c-primary:#a73997;
  --c-accent:#64b851;
  --c-cta:#34cb3e;
  --c-bg:#fbf8fb;
  --c-card:#ffffff;
  --c-text:#2c1b2a;
  --c-muted:#7a5c76;
  --c-line:#e6dbe4;
  --radius:10px;
  --shadow-sm:0 1px 2px rgba(44,27,42,.05);
  --shadow-md:0 8px 22px rgba(167,57,151,.10);
  --font-head:'Poppins','Noto Sans SC',system-ui,sans-serif;
  --font-body:system-ui,-apple-system,'PingFang SC','Microsoft YaHei','Segoe UI',sans-serif;
  --font-kai:'KaiTi','STKaiti','Kaiti SC','FangSong','STFangsong','SimSun','Noto Serif SC',serif;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--c-bg);
  color:var(--c-text);
  font-family:var(--font-body);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%}
a{color:var(--c-primary)}
button{font-family:inherit;cursor:pointer}
input,select,textarea{font-family:inherit;font-size:14px}
.hidden{display:none!important}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(251,248,251,.9);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--c-line);
}
.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:11px;text-decoration:none;color:var(--c-text)}
.brand-mark{
  width:40px;height:40px;border-radius:var(--radius);
  background:var(--c-primary);color:#fff;
  display:grid;place-items:center;
  font-family:var(--font-kai);font-size:21px;font-weight:700;
  box-shadow:0 3px 10px rgba(167,57,151,.25);
}
.brand-name{display:block;font-family:var(--font-head);font-weight:700;font-size:17px;letter-spacing:.4px}
.brand-sub{display:block;font-size:11px;color:var(--c-muted);letter-spacing:.5px}
.main-nav{margin-left:auto;display:flex;gap:6px;flex-wrap:wrap}
.main-nav a{
  padding:8px 15px;border-radius:8px;
  color:var(--c-muted);text-decoration:none;
  font-size:14px;font-weight:500;transition:all .2s;
}
.main-nav a:hover{color:var(--c-primary);background:rgba(167,57,151,.07)}
.main-nav a.active{color:#fff;background:var(--c-primary);box-shadow:0 3px 10px rgba(167,57,151,.25)}

/* ---------- 主区域 ---------- */
.site-main{max-width:1100px;margin:0 auto;padding:26px 20px 70px}
.page-head{margin-bottom:22px;animation:fadeUp .5s ease both}
.page-head h1{font-family:var(--font-head);font-size:26px;margin:0 0 6px;letter-spacing:.3px}
.page-head p{margin:0;color:var(--c-muted)}

@keyframes fadeUp{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* ---------- Hero ---------- */
.hero{
  display:flex;gap:22px;align-items:center;justify-content:space-between;flex-wrap:wrap;
  background:linear-gradient(120deg,#ffffff 0%,#f9eef8 100%);
  border:1px solid var(--c-line);border-radius:var(--radius);
  padding:30px 32px;margin-bottom:22px;animation:fadeUp .5s ease both;
  box-shadow:var(--shadow-sm);
}
.hero h1{font-family:var(--font-head);font-size:27px;margin:0 0 8px;letter-spacing:.3px}
.hero-copy{flex:1;min-width:260px}
.hero p{margin:0 0 18px;color:var(--c-muted);max-width:560px}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap}
.hero-cards{display:flex;gap:12px;flex-wrap:wrap}
.stat{
  min-width:92px;padding:14px 16px;text-align:center;
  background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);
}
.stat b{display:block;font-family:var(--font-head);font-size:24px;color:var(--c-primary);line-height:1.2}
.stat span{font-size:12px;color:var(--c-muted)}

/* ---------- 卡片 ---------- */
.card{
  background:var(--c-card);border:1px solid var(--c-line);
  border-radius:var(--radius);box-shadow:var(--shadow-sm);
  padding:22px;margin-bottom:18px;animation:fadeUp .55s ease both;
  transition:box-shadow .25s;
}
.card:hover{box-shadow:var(--shadow-md)}
.card-title{
  font-family:var(--font-head);font-weight:600;font-size:16px;
  margin:0 0 16px;display:flex;align-items:center;gap:9px;letter-spacing:.2px;
}
.card-title::before{content:"";width:4px;height:16px;border-radius:2px;background:var(--c-primary)}
.card-title .sub{margin-left:auto;font-size:12px;font-weight:400;color:var(--c-muted)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:7px;
  border:none;border-radius:8px;padding:9px 18px;
  font-size:14px;font-weight:600;text-decoration:none;
  transition:transform .15s,box-shadow .2s,background .2s,color .2s,border-color .2s;
}
.btn:active{transform:scale(.97)}
.btn-primary{background:var(--c-primary);color:#fff}
.btn-primary:hover{box-shadow:0 5px 14px rgba(167,57,151,.32)}
.btn-cta{background:var(--c-cta);color:#0b2a10}
.btn-cta:hover{box-shadow:0 5px 14px rgba(52,203,62,.4)}
.btn-ghost{background:#fff;border:1px solid var(--c-line);color:var(--c-text)}
.btn-ghost:hover{border-color:var(--c-primary);color:var(--c-primary)}
.btn-danger{background:#fff;border:1px solid var(--c-line);color:#b0465c}
.btn-danger:hover{border-color:#b0465c;color:#b0465c}
.btn-sm{padding:6px 12px;font-size:13px}

/* ---------- 表单 ---------- */
.toolbar{display:flex;flex-wrap:wrap;gap:14px;align-items:flex-end}
.field{display:flex;flex-direction:column;gap:6px;min-width:120px}
.field label{font-size:13px;color:var(--c-muted);font-weight:500}
.field select,.field input[type=text],.field input[type=date],.field textarea{
  padding:8px 10px;border:1px solid var(--c-line);border-radius:8px;
  background:#fff;color:var(--c-text);outline:none;transition:border-color .2s,box-shadow .2s;
}
.field select:focus,.field input:focus,.field textarea:focus{
  border-color:var(--c-primary);box-shadow:0 0 0 3px rgba(167,57,151,.12);
}
.check{display:flex;flex-direction:row;align-items:center;gap:8px;font-size:14px;color:var(--c-text);cursor:pointer;margin-top:0}
.check input{accent-color:var(--c-primary);width:16px;height:16px}
.hint{font-size:13px;color:var(--c-muted)}

/* ---------- 年级选择 ---------- */
.chips{display:flex;flex-wrap:wrap;gap:10px}
.chip{
  border:1px solid var(--c-line);background:#fff;border-radius:20px;
  padding:7px 17px;font-size:14px;color:var(--c-muted);
  transition:all .18s;
}
.chip:hover{border-color:var(--c-primary);color:var(--c-primary)}
.chip.active{background:var(--c-primary);border-color:var(--c-primary);color:#fff;box-shadow:0 3px 10px rgba(167,57,151,.25)}

/* ---------- 田字格 ---------- */
.tiancell{
  position:relative;width:var(--cell,58px);height:var(--cell,58px);
  border:1px solid #4a4a4a;background:#fff;flex:none;
}
.tiancell .mid-h,.tiancell .mid-v,.tiancell .diag{position:absolute;pointer-events:none}
.tiancell .mid-h{left:0;right:0;top:50%;height:1px;background:rgba(60,60,60,.28)}
.tiancell .mid-v{top:0;bottom:0;left:50%;width:1px;background:rgba(60,60,60,.28)}
.tiancell .diag{
  inset:0;
  background:
    linear-gradient(to top right, transparent calc(50% - .5px), rgba(60,60,60,.24) calc(50% - .5px), rgba(60,60,60,.24) calc(50% + .5px), transparent calc(50% + .5px)),
    linear-gradient(to bottom right, transparent calc(50% - .5px), rgba(60,60,60,.24) calc(50% - .5px), rgba(60,60,60,.24) calc(50% + .5px), transparent calc(50% + .5px));
}
.tiancell .char{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  font-family:var(--font-kai);font-size:calc(var(--cell,58px)*.8);
  line-height:1;color:var(--c-text);
}
.tiancell .pinyin{
  position:absolute;top:2px;left:4px;text-align:left;
  font-size:10px;line-height:1;color:var(--c-primary);white-space:nowrap;pointer-events:none;
}
.tiancell .grid-guide{position:absolute;inset:0;pointer-events:none}

/* ---------- 字帖 ---------- */
.print-area{display:block}
.sheet{background:#fff;padding:26px;border:1px solid var(--c-line);border-radius:var(--radius);overflow-x:auto}
.sheet-head{
  display:flex;justify-content:space-between;align-items:flex-end;flex-wrap:wrap;gap:8px;
  border-bottom:1.5px dashed #b8b8b8;padding-bottom:12px;margin-bottom:18px;
}
.sheet-head .title{font-family:var(--font-kai);font-size:24px;letter-spacing:3px;color:var(--c-text)}
.sheet-head .meta{font-size:13px;color:#555;letter-spacing:.5px}
.sheet-rows{padding:2px}
.sheet-group{margin-bottom:12px;page-break-inside:avoid;break-inside:avoid}
.sheet-row{display:flex;gap:8px;margin-bottom:8px;flex-wrap:wrap;page-break-inside:avoid;break-inside:avoid}
.sheet-note{font-size:12px;color:#999;margin-top:14px}

/* ---------- 笔画示范页 ---------- */
.stroke-stage{display:grid;grid-template-columns:350px 1fr;gap:22px;align-items:start}
@media(max-width:860px){.stroke-stage{grid-template-columns:1fr}}
.canvas-box{
  background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);
  padding:16px;display:flex;flex-direction:column;align-items:center;
}
.canvas-box canvas{width:100%;max-width:330px;height:auto;display:block}
.stroke-controls{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-top:14px}
.stroke-legend{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px;justify-content:center}
.stroke-legend .dot{
  width:26px;height:26px;border-radius:7px;display:grid;place-items:center;
  font-size:12px;font-weight:600;background:#f4edf3;color:var(--c-muted);
  border:1px solid var(--c-line);transition:all .2s;
}
.stroke-legend .dot.done{background:var(--c-primary);color:#fff;border-color:var(--c-primary)}
.stroke-legend .dot.cur{background:var(--c-cta);color:#0b2a10;border-color:var(--c-cta);transform:scale(1.12)}

.stroke-info .info-head{display:flex;align-items:center;gap:16px;margin-bottom:16px}
.stroke-info .big-char{
  font-family:var(--font-kai);font-size:66px;line-height:1;color:var(--c-primary);
}
.stroke-info h3{font-family:var(--font-head);font-size:22px;margin:0 0 4px}
.stroke-info .muted{color:var(--c-muted);font-size:14px}
.info-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(108px,1fr));gap:10px;margin-bottom:16px}
.info-item{background:var(--c-bg);border:1px solid var(--c-line);border-radius:8px;padding:9px 12px}
.info-item b{display:block;font-size:12px;color:var(--c-muted);font-weight:500}
.info-item span{font-size:15px;font-weight:600}
.tips-box{
  background:linear-gradient(135deg,#fff 0%,#f9eff8 100%);
  border:1px solid var(--c-line);border-left:3px solid var(--c-primary);
  border-radius:8px;padding:12px 14px;font-size:14px;color:var(--c-text);margin-bottom:16px;
}
.tips-box b{color:var(--c-primary);font-size:13px;margin-right:6px}
.words-box{
  border:1px solid var(--c-line);border-radius:8px;padding:10px 14px;
  font-size:14px;background:#fff;margin-bottom:16px;
}
.words-box b{color:var(--c-primary);font-size:13px;margin-right:6px}

.char-picker{display:flex;flex-wrap:wrap;gap:9px}
.char-picker button{
  width:46px;height:46px;border:1px solid var(--c-line);background:#fff;border-radius:8px;
  font-family:var(--font-kai);font-size:25px;line-height:1;display:grid;place-items:center;
  color:var(--c-text);transition:all .16s;
}
.char-picker button:hover{border-color:var(--c-primary);color:var(--c-primary);transform:translateY(-2px)}
.char-picker button.active{background:var(--c-primary);border-color:var(--c-primary);color:#fff;box-shadow:0 3px 10px rgba(167,57,151,.28)}
.range-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;font-size:13px;color:var(--c-muted);margin-bottom:12px}
.range-row input[type=range]{flex:1;min-width:120px;accent-color:var(--c-primary)}

/* ---------- 作品展示页 ---------- */
.upload-drop{
  margin-top:16px;border:1.5px dashed var(--c-primary);border-radius:var(--radius);
  background:#fdf8fd;padding:30px 16px;text-align:center;cursor:pointer;transition:all .2s;
}
.upload-drop:hover,.upload-drop.drag{background:#f8ecf7;border-color:var(--c-primary)}
.upload-drop p{margin:0 0 4px;font-weight:600;color:var(--c-primary);font-size:15px}
.upload-drop span{font-size:12px;color:var(--c-muted)}
.gallery-section{margin-top:6px}
.gallery-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px}
.work-card{
  overflow:hidden;border:1px solid var(--c-line);border-radius:var(--radius);
  background:#fff;transition:transform .2s,box-shadow .2s;animation:fadeUp .5s ease both;
}
.work-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.work-card img{aspect-ratio:4/3;object-fit:cover;width:100%;display:block;background:#f0e8ef}
.work-card .work-info{padding:12px 14px;border-top:1px solid var(--c-line)}
.work-card .work-name{font-weight:700;font-size:15px;margin-bottom:2px}
.work-card .work-date{font-size:12px;color:var(--c-muted);margin-bottom:6px}
.work-card .work-note{font-size:13px;color:var(--c-text);margin-bottom:10px;min-height:18px}
.work-card .work-actions{display:flex;gap:8px}
.work-card.selected{border-color:var(--c-accent);box-shadow:0 0 0 2px rgba(100,184,81,.35)}
.empty-state{text-align:center;padding:46px 20px;color:var(--c-muted)}
.empty-state .icon{font-size:42px;margin-bottom:10px}

.compare-bar{
  position:sticky;bottom:12px;z-index:40;display:flex;align-items:center;gap:10px;flex-wrap:wrap;
  background:#fff;border:1px solid var(--c-primary);border-radius:var(--radius);
  box-shadow:0 8px 24px rgba(167,57,151,.16);padding:12px 16px;margin-top:18px;
}
.compare-bar .label{font-weight:600;color:var(--c-primary)}
.compare-thumbs{display:flex;gap:8px;flex:1;min-width:140px;flex-wrap:wrap}
.compare-thumbs .th{position:relative;width:54px;height:54px;border-radius:8px;overflow:hidden;border:1px solid var(--c-line)}
.compare-thumbs .th img{width:100%;height:100%;object-fit:cover}
.compare-thumbs .th button{
  position:absolute;top:-2px;right:-2px;width:18px;height:18px;border-radius:50%;
  border:none;background:var(--c-primary);color:#fff;font-size:11px;line-height:1;padding:0;
}
.compare-view{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px;margin-top:16px}
.compare-view .c-item{border:1px solid var(--c-line);border-radius:var(--radius);overflow:hidden;background:#fff}
.compare-view .c-item img{width:100%;aspect-ratio:4/3;object-fit:cover;display:block}
.compare-view .c-item .c-cap{padding:10px 12px;font-size:13px}
.compare-view .c-item .c-cap b{display:block;font-size:14px}
.compare-view .c-item .c-cap span{color:var(--c-muted);font-size:12px}
.compare-note{
  margin-top:14px;padding:12px 14px;background:#f0fbea;border:1px solid #cdeec3;
  border-radius:8px;font-size:13px;color:#2f5c28;
}

/* ---------- 页脚 ---------- */
.site-footer{
  border-top:1px solid var(--c-line);background:#fff;
  padding:22px 20px;text-align:center;color:var(--c-muted);font-size:13px;
}
.site-footer b{color:var(--c-primary);font-weight:600}

/* ---------- 响应式 ---------- */
@media (max-width:720px){
  .header-inner{gap:8px}
  .brand-name{font-size:15px}
  .site-main{padding:18px 12px 50px}
  .hero{padding:22px 18px}
  .hero h1{font-size:22px}
  .sheet{padding:16px 10px}
  .tiancell{--cell:46px}
}

/* ---------- 打印样式 ---------- */
@media print{
  @page{size:A4;margin:12mm}
  body{background:#fff;color:#000}
  .no-print,.site-header,.site-footer,.hero{display:none!important}
  .site-main{max-width:none;margin:0;padding:0}
  .print-area{display:block!important;margin:0}
  .sheet{border:none;box-shadow:none;border-radius:0;padding:0;overflow:visible}
  .sheet-row{page-break-inside:avoid;break-inside:avoid}
  .tiancell{border-color:#000;background:#fff;-webkit-print-color-adjust:exact;print-color-adjust:exact}
  .tiancell .char{color:#000}
}