:root{
  --bg:#FFFCF6; --card:#FFFFFF; --ink:#2B2118; --text:#5B5245; --mute:#857A6B;
  --line:#EFE6D8; --sun:#F59E0B; --sun-deep:#B45309; --sun-soft:#FFF4E0;
  --sky:#0EA5E9; --sky-soft:#E8F6FE; --leaf:#10B981; --coral:#FB7185; --coral-soft:#FFEDF0;
  --radius:18px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;min-height:100%}
body{
  background:radial-gradient(1200px 600px at 80% -10%, #FFF1D6 0%, transparent 60%), var(--bg);
  color:var(--ink); font-family:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",system-ui,sans-serif;
  padding:16px 14px 30px; display:flex; justify-content:center;
}
.app{width:100%;max-width:980px}

/* ---------- 品牌 ---------- */
.brand{display:flex;align-items:center;gap:12px;margin:4px 2px 18px}
.logo{width:52px;height:52px;border-radius:16px;flex:none;text-decoration:none;
  background:linear-gradient(135deg,#38BDF8,#0EA5E9);display:grid;place-items:center;
  color:#fff;font-size:26px;font-weight:800;box-shadow:0 6px 16px rgba(14,165,233,.35)}
.brand h1{margin:0;font-size:22px;letter-spacing:.5px}
.brand p{margin:3px 0 0;font-size:12.5px;color:var(--mute)}

/* ---------- 首页 ---------- */
.daily{display:flex;align-items:center;gap:14px;background:linear-gradient(135deg,#E8F6FE,#D6EEFC);
  border:1px solid #BFE3F7;border-radius:20px;padding:15px 18px;margin-bottom:16px}
.daily .dinfo{flex:1;min-width:0}
.daily .dtitle{font-size:15.5px;font-weight:800}
.daily .dsub{font-size:12px;color:#3A6C87;margin-top:3px}
.daily button{border:0;background:var(--sky);color:#fff;border-radius:12px;padding:11px 18px;
  font-weight:800;font-family:inherit;cursor:pointer;font-size:13.5px;white-space:nowrap}

.quick{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:16px}
.qcard{border-radius:var(--radius);padding:16px 14px;text-align:left;cursor:pointer;
  background:var(--card);box-shadow:0 6px 18px rgba(120,95,60,.10);border:1px solid var(--line);
  transition:transform .08s, box-shadow .15s;font-family:inherit}
.qcard:hover{box-shadow:0 8px 22px rgba(120,95,60,.16)}
.qcard:active{transform:scale(.98)}
.qtag{font-size:11.5px;font-weight:700;letter-spacing:.5px}
.qtitle{font-size:17px;font-weight:800;margin:6px 0 4px}
.qsub{font-size:12px;color:var(--text);line-height:1.45}

.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;box-shadow:0 8px 24px rgba(120,95,60,.08)}
.row{display:flex;align-items:center;gap:14px;margin-bottom:14px;flex-wrap:wrap}
.row>label{width:52px;font-size:13px;font-weight:700;color:var(--mute);flex:none}
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{border:1px solid var(--line);background:#fff;color:var(--text);border-radius:999px;
  padding:9px 14px;font-size:13.5px;font-weight:600;cursor:pointer;font-family:inherit;transition:.12s}
.chip:hover{border-color:var(--sky);color:#0369A1}
.chip.on{background:var(--sky);border-color:var(--sky);color:#fff;box-shadow:0 4px 12px rgba(14,165,233,.3)}
.start{width:100%;margin-top:6px;border:0;border-radius:14px;padding:16px;font-size:17px;font-weight:800;
  color:#fff;background:linear-gradient(135deg,#38BDF8,#0EA5E9);cursor:pointer;font-family:inherit;
  box-shadow:0 8px 20px rgba(14,165,233,.32)}
.pid{display:flex;align-items:center;gap:8px;margin-top:12px;font-size:13px;color:var(--mute)}
.pid input{flex:1;border:1px solid var(--line);border-radius:10px;padding:9px 12px;font-size:14px;
  font-family:inherit;color:var(--ink);background:#FFFDF9;min-width:0}
.pid button{border:1px solid var(--line);background:#fff;border-radius:10px;padding:9px 14px;
  font-size:13px;font-weight:700;cursor:pointer;font-family:inherit;color:var(--text)}
.resume{width:100%;margin-top:14px;border:1px dashed #C8B79B;background:#FFFBF2;border-radius:14px;
  padding:13px;font-size:14px;font-weight:700;color:#8A6A3B;cursor:pointer;font-family:inherit}
.stats{display:flex;gap:10px;margin-top:16px}
.stat{flex:1;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px 14px}
.stat b{display:block;font-size:20px;color:#0369A1}
.stat span{font-size:11.5px;color:var(--mute)}
.links{display:flex;gap:10px;margin-top:14px;flex-wrap:wrap}
.links a{border:1px solid var(--line);background:#fff;border-radius:12px;padding:10px 14px;
  font-size:13px;font-weight:700;color:var(--text);text-decoration:none}
.links a:hover{border-color:var(--sky);color:#0369A1}

/* ---------- 答题 ---------- */
#game{display:none}
#game.on{display:block}
.topbar{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.back{border:1px solid var(--line);background:#fff;border-radius:12px;padding:9px 13px;cursor:pointer;
  font-family:inherit;font-size:13px;font-weight:700;color:var(--text)}
.level{flex:1;font-size:14px;font-weight:800}
.meta{display:flex;gap:8px}
.pill{background:#E8F6FE;color:#0369A1;border-radius:999px;padding:6px 11px;font-size:12.5px;
  font-weight:800;font-variant-numeric:tabular-nums}
.pill.gray{background:#F6F2EA;color:var(--mute)}

.board{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:14px;
  box-shadow:0 10px 30px rgba(120,95,60,.10);
  display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:22px;align-items:start}

.grid{display:grid;aspect-ratio:1/1;width:100%;max-width:min(560px,58vh);margin:0 auto;
  border:3px solid var(--ink);border-radius:10px;overflow:hidden;background:#fff;grid-auto-rows:1fr}
.cell{position:relative;display:grid;place-items:center;background:#fff;cursor:pointer;
  user-select:none;transition:background .08s}
.cell .v{font-size:var(--fs);font-weight:800;line-height:1;color:var(--ink)}
.cell.given .v{color:var(--ink)}
.cell.user .v{color:#0369A1}
.cell.hint .v{color:#0EA5E9}
.cell.peer{background:#F6FAFD}
.cell.same{background:#E3F2FD}
.cell.sel{background:#D6EEFC;box-shadow:inset 0 0 0 3px var(--sky)}
.cell.err{background:#FFE9EC}
.cell.err .v{color:#E11D48}
.cell .notes{position:absolute;inset:6%;display:grid;color:#9A8F80;font-weight:700;line-height:1}
.cell .notes span{display:grid;place-items:center}

.side{display:flex;flex-direction:column;gap:12px}
.mode{display:grid;grid-template-columns:1fr 1fr;gap:6px;background:#F7F2E9;border-radius:12px;padding:5px}
.mode button{border:0;background:transparent;border-radius:9px;padding:9px 0;font-size:13.5px;
  font-weight:800;color:var(--mute);cursor:pointer;font-family:inherit}
.mode button.on{background:#fff;color:#0369A1;box-shadow:0 2px 8px rgba(0,0,0,.08)}
.pad{display:grid;gap:8px}
.pad button{border:1px solid var(--line);background:#fff;border-radius:14px;padding:14px 0;
  font-size:22px;font-weight:800;color:var(--ink);cursor:pointer;font-family:inherit;transition:.1s}
.pad button:hover{background:var(--sky-soft);border-color:var(--sky)}
.pad button:active{transform:scale(.96)}
.pad button.erase{font-size:14px;color:var(--text);background:#FAF6EF}
.acts{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.acts button{border-radius:13px;padding:12px 0;font-size:14px;font-weight:700;cursor:pointer;
  font-family:inherit;border:1px solid var(--line);background:#fff;color:var(--text)}
.acts button.primary{grid-column:span 2;background:var(--sky);border-color:var(--sky);color:#fff}
.acts button:disabled{opacity:.45;cursor:not-allowed}
.msg{min-height:22px;font-size:13px;font-weight:700;color:var(--text);text-align:center}
.msg.ok{color:#047857}.msg.bad{color:#BE123C}

/* ---------- 通关 ---------- */
.win{position:fixed;inset:0;background:rgba(43,33,24,.45);display:none;align-items:center;
  justify-content:center;padding:20px;z-index:50}
.win.on{display:flex}
.wincard{background:#fff;border-radius:24px;padding:28px 26px;max-width:380px;width:100%;text-align:center;
  box-shadow:0 20px 60px rgba(0,0,0,.25);animation:pop .22s ease-out}
@keyframes pop{from{transform:scale(.92)}to{transform:scale(1)}}
.stars{font-size:38px;letter-spacing:6px;margin-bottom:6px;color:var(--sun);line-height:1}
.stars .off{color:#E7DED0}
.wincard h2{margin:6px 0 8px;font-size:22px}
.wincard p{margin:0 0 18px;color:var(--text);font-size:13.5px;line-height:1.6}
.winbtn{width:100%;border:0;border-radius:14px;padding:14px;font-size:16px;font-weight:800;
  cursor:pointer;font-family:inherit;margin-bottom:8px}
.winbtn.main{background:var(--sky);color:#fff}
.winbtn.ghost{background:#F7F3EC;color:var(--text)}
.confetti{position:fixed;inset:0;pointer-events:none;overflow:hidden;z-index:49}
.confetti i{position:absolute;width:9px;height:14px;border-radius:2px;animation:fall linear forwards}
@keyframes fall{to{transform:translateY(110vh) rotate(720deg);opacity:.9}}

footer{margin-top:18px;text-align:center;font-size:11.5px;color:var(--mute);line-height:1.8}

@media (max-width:760px){
  .board{grid-template-columns:1fr;gap:14px}
  .quick{grid-template-columns:1fr;gap:10px}
  .grid{max-width:none}
  .brand h1{font-size:19px}
}