/* ============================================================
   作业撕条 · 样式
   画风沿用英语小屋：奶油底 + 深棕粗描边 + 圆角，同一家人。
   只按 375×812 手机端设计。
   ============================================================ */
:root{
  --bg:#FFF8EF; --ink:#4A3728; --paper:#FFFDF6; --soft:#F3E9DC; --muted:#8B7B6B;
  --red:#FF6B6B; --yellow:#FFC93C; --green:#7BC96F; --blue:#5BB0E8; --purple:#9B7BE8;
  --zh:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--zh);font-size:15px;
     min-height:100dvh;overflow-x:hidden;user-select:none;-webkit-text-size-adjust:100%}
.wrap{max-width:440px;margin:0 auto;padding:16px 16px calc(30px + env(safe-area-inset-bottom))}

/* ---------- 顶部 ---------- */
.top{display:flex;align-items:flex-start;gap:10px;margin-bottom:12px}
.top .ti{flex:1;min-width:0}
h1{font-size:21px;margin:0;display:flex;align-items:center;gap:7px}
.date{font-size:12.5px;opacity:.55;margin-top:1px}
.gear{flex:0 0 auto;width:38px;height:38px;border:2.5px solid var(--ink);border-radius:11px;
      background:#fff;display:grid;place-items:center;font-size:17px;cursor:pointer;
      box-shadow:0 3px 0 rgba(74,55,40,.2);font-family:inherit;padding:0}
.gear:active{transform:translateY(3px);box-shadow:none}

.syncdot{width:8px;height:8px;border-radius:50%;background:var(--green);flex:0 0 auto;opacity:.85}
.syncdot.syncing{background:var(--yellow);animation:dotpulse 1s infinite}
.syncdot.offline{background:#CFC6B8}
@keyframes dotpulse{0%,100%{opacity:1}50%{opacity:.35}}

.count{display:flex;align-items:baseline;gap:8px;margin:2px 0 9px}
.count b{font-size:38px;line-height:1}
.count span{font-size:14px;opacity:.62}
.bar-wrap{display:flex;gap:5px;margin:0 0 18px;min-height:13px}
.seg{flex:1;height:13px;border:2.5px solid var(--ink);border-radius:4px;background:#fff;
     transition:background .45s cubic-bezier(.2,1.4,.4,1),transform .45s}
.seg.on{background:var(--green);transform:scaleY(1.22)}

/* ---------- 纸条 ---------- */
#list{position:relative}
.row{position:relative;height:76px;margin-bottom:11px;
     transition:height .3s cubic-bezier(.3,0,.2,1),margin-bottom .3s cubic-bezier(.3,0,.2,1),opacity .22s}
.row.gone{height:0;margin-bottom:0;opacity:0;pointer-events:none}
.strip{position:absolute;inset:0;background:var(--paper);border:2.5px solid var(--ink);
  border-radius:10px;box-shadow:0 3px 0 rgba(74,55,40,.18);display:flex;align-items:center;
  gap:11px;padding:0 13px;touch-action:pan-y;cursor:grab;will-change:transform}
.perf{position:absolute;left:33px;top:6px;bottom:6px;border-left:2.5px dashed rgba(74,55,40,.32)}
.dot{width:8px;height:8px;border-radius:50%;background:var(--ink);opacity:.15;position:absolute;left:12px}
.d1{top:15px}.d2{bottom:15px}
.tag{flex:0 0 auto;margin-left:30px;width:30px;height:30px;border-radius:9px;display:grid;
     place-items:center;font-size:15px;border:2px solid var(--ink)}
.txt{flex:1;min-width:0}
.txt .t{font-size:16px;font-weight:800;line-height:1.3}
.txt .m{font-size:11.5px;opacity:.5;margin-top:1px}
.hint{position:absolute;right:11px;font-size:11px;opacity:.35;font-weight:700}

/* 撕开后飞走的两半 */
.piece{position:fixed;background:var(--paper);border:2.5px solid var(--ink);pointer-events:none;
  z-index:50;will-change:transform,opacity;display:flex;align-items:center;padding:0 10px;
  overflow:hidden;white-space:nowrap;font-size:16px;font-weight:800}

/* ---------- 空状态 / 全撕完 ---------- */
.empty,.done{text-align:center;padding:34px 14px;border:2.5px dashed rgba(74,55,40,.28);
             border-radius:16px;background:rgba(255,255,255,.5)}
.empty .big,.done .big{font-size:42px}
.empty h2,.done h2{font-size:19px;margin:8px 0 4px}
.empty p,.done p{font-size:13.5px;opacity:.62;margin:0}

/* ---------- 碎片堆 ---------- */
.pile{margin-top:24px;border-top:2.5px dashed rgba(74,55,40,.25);padding-top:13px}
.pile h2{font-size:13.5px;margin:0 0 9px;opacity:.65;font-weight:800}
.pile .lite{font-weight:400;opacity:.75}
.scraps{display:flex;flex-wrap:wrap;gap:7px}
.scrap{background:#F0E6D8;border:2px solid rgba(74,55,40,.45);border-radius:7px;padding:3px 9px;
  font-size:12px;font-weight:700;opacity:.72;transform:rotate(var(--r));cursor:pointer;
  animation:drop .34s cubic-bezier(.2,1.3,.4,1)}
.scrap:active{transform:rotate(var(--r)) scale(.94)}
@keyframes drop{from{transform:translateY(-16px) rotate(var(--r)) scale(.8);opacity:0}}

/* ---------- 家长区 ---------- */
.sheet{position:fixed;inset:0;z-index:60;background:rgba(74,55,40,.42);display:none}
.sheet.on{display:block}
.panel{position:absolute;left:0;right:0;bottom:0;max-height:92dvh;overflow:auto;background:var(--bg);
  border-top:3px solid var(--ink);border-radius:20px 20px 0 0;
  padding:16px 16px calc(24px + env(safe-area-inset-bottom));max-width:440px;margin:0 auto}
.ph{display:flex;align-items:center;margin-bottom:4px}
.ph h2{font-size:18px;margin:0;flex:1}
.pbanner{background:var(--ink);color:#fff;font-size:12px;font-weight:700;text-align:center;
  border-radius:9px;padding:5px;margin:8px 0 14px}
.sec{font-size:13.5px;font-weight:800;margin:18px 0 7px;opacity:.75}
textarea,input[type=text]{width:100%;font-family:inherit;font-size:15px;border:2.5px solid var(--ink);
  border-radius:11px;padding:10px 12px;background:#fff;color:var(--ink);user-select:text}
textarea{height:110px;resize:vertical;line-height:1.6}
.btn{border:2.5px solid var(--ink);background:#fff;border-radius:11px;padding:10px 14px;
  font-family:inherit;font-size:14.5px;font-weight:800;cursor:pointer;box-shadow:0 3px 0 rgba(74,55,40,.25)}
.btn:active{transform:translateY(3px);box-shadow:none}
.btn.y{background:var(--yellow)} .btn.g{background:var(--green)}
.btn.sm{padding:7px 11px;font-size:13px;box-shadow:0 2px 0 rgba(74,55,40,.25)}
.btnrow{display:flex;gap:8px;flex-wrap:wrap;margin-top:9px}
.chips{display:flex;gap:7px;flex-wrap:wrap;margin-top:8px}
.chip{border:2px solid var(--ink);background:#fff;border-radius:20px;padding:4px 11px;
  font-size:13px;font-weight:700;cursor:pointer;display:flex;align-items:center;gap:5px}
.chip.on{background:var(--yellow)}
.chip .tx{opacity:.4;font-weight:800;padding:0 2px}
.prev{margin-top:10px;display:flex;flex-direction:column;gap:7px}
.pv,.mi{display:flex;align-items:center;gap:9px;background:#fff;border:2px solid var(--ink);
  border-radius:10px;padding:8px 11px;font-size:14px}
.pv .pt,.mi .mt{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.mi .mt.off{text-decoration:line-through;opacity:.45}
.pv .x,.mi .x{margin-left:auto;font-weight:800;opacity:.45;cursor:pointer;padding:0 4px;flex:0 0 auto}
.mlist{display:flex;flex-direction:column;gap:7px;margin-top:8px}
.tiny{font-size:12px;opacity:.58;line-height:1.7;margin:7px 0 0}
.keybox{background:#fff;border:2.5px solid var(--ink);border-radius:12px;padding:10px 13px;margin:10px 0}
.keybox .kb-label{font-size:12px;opacity:.6;margin-bottom:3px}
.keybox .kb-key{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:14px;
  font-weight:700;word-break:break-all;user-select:all;line-height:1.5}