:root {
  --bg: #F7F8F5;
  --surface: #FFF;
  --ink: #233633;
  --muted: #66766D;
  --teal: #1F6F6A;
  --line: #DDE4DF;
  --light: #EEF3F0;
  --selected: #D4E8E1;
  --peer: #F0F5F2;
  --same: #E1ECE7;
  --danger: #B44E47;
  --bad: #F5D6D2;
  --shadow: 0 14px 50px #284E3B08;
  --cell-line: #DBE3DE;
  --box-line: #82968D;
  --grid-edge: #58756B;
}

*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{margin:0;padding:0;min-height:100%}
body{
  min-height:100dvh;
  background:var(--bg);
  color:var(--ink);
  font-family:"PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei","Source Han Sans SC",system-ui,sans-serif;
  -webkit-font-smoothing:antialiased;
}
button,input,a{font:inherit;color:inherit}
button{cursor:pointer;-webkit-tap-highlight-color:transparent;border:0;background:transparent}
button:focus-visible,input:focus-visible,a:focus-visible{outline:2px solid var(--teal);outline-offset:3px}
button:disabled{opacity:.38;cursor:default}
.numeric,.cell,.pad,.time,.val,.idx{font-family:"Avenir Next","SF Pro Rounded",Arial,sans-serif;font-variant-numeric:tabular-nums}
.muted{color:var(--muted)}

.app{
  width:min(420px,100%);
  margin:0 auto;
  min-height:100dvh;
  padding:0 20px calc(28px + env(safe-area-inset-bottom));
  display:flex;
  flex-direction:column;
}

/* —— Top bar —— */
.topbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:72px;
  border-bottom:1px solid var(--line);
  margin:0 -2px;
  flex:0 0 auto;
}
.brand{
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:600;
  font-size:20px;
  letter-spacing:1px;
  border:0;
  background:transparent;
  padding:0;
  text-align:left;
}
.brand-mark{
  display:grid;
  grid-template-columns:repeat(3,6px);
  gap:2.5px;
}
.brand-mark i{
  width:6px;height:6px;border-radius:1px;background:#A2BCB3;
}
.brand-mark .s1,.brand-mark .s3,.brand-mark .s4,.brand-mark .s7{background:var(--teal)}
.brand-en{
  display:block;
  font:7px/1.2 Arial,sans-serif;
  letter-spacing:2px;
  color:var(--muted);
  margin-top:2px;
}
.header-right{display:flex;align-items:center;gap:12px}
.icon-btn{
  width:32px;height:32px;display:grid;place-items:center;color:#6F7B76;padding:0;
}
.icon-btn svg{width:20px;height:20px}
.login-chip{
  height:32px;padding:0 12px;border-radius:999px;
  background:var(--teal);color:#fff;font-size:13px;font-weight:500;
}
.avatar{
  width:32px;height:32px;border-radius:50%;overflow:hidden;
  flex:0 0 auto;background:var(--light);display:block;
}
.avatar.lg{width:67px;height:67px}
.avatar.sm{width:27px;height:27px}
.avatar img,.mini img,.avatar-option img,.avatar-upload-preview img{
  display:block;width:100%;height:100%;object-fit:cover;
}
.profile-btn{padding:0;border:0;background:transparent;border-radius:50%}

/* —— Home —— */
#screen-home{padding-top:20px}
.hello{
  display:flex;align-items:center;gap:9px;
  font-size:12px;color:var(--muted);margin-bottom:16px;
}
.home-title{
  margin:0;font-size:30px;font-weight:600;letter-spacing:-.6px;line-height:1.25;
}
.intro{margin:10px 0 0;font-size:13px;color:var(--muted);line-height:1.5}
.difficulty-list{margin-top:24px;border-top:1px solid var(--line)}
.diff{
  display:flex;align-items:center;width:100%;
  height:69px;gap:16px;padding:0;
  border:0;border-bottom:1px solid var(--line);
  background:transparent;text-align:left;
}
.diff-icon{
  display:grid;grid-template-columns:repeat(2,7px);gap:4px;width:26px;flex:0 0 auto;
}
.diff-icon i{width:7px;height:7px;background:#DEE6E0;border-radius:1px}
.diff-icon i.filled{background:#7B9F91}
.diff-copy{flex:1;display:flex;align-items:center;justify-content:space-between;padding-right:8px;min-width:0}
.diff-copy b{font-size:17px;font-weight:500}
.diff-copy small{font-size:11px;color:var(--muted);font-weight:400}
.diff-arrow{color:#7A8D85;font-size:18px;line-height:1}
.rank-link{
  display:inline-flex;align-items:center;gap:8px;
  margin-top:18px;padding:0;border:0;background:transparent;
  color:var(--muted);font-size:12px;
}
.rank-link svg{width:16px;height:16px}
.resume-pane{
  margin-top:22px;padding:18px;
  border:1px solid var(--line);background:var(--surface);
  border-radius:12px;
}
.resume-heading{
  display:flex;justify-content:space-between;align-items:center;
  font-size:14px;font-weight:500;margin:0 0 14px;
}
.saved{
  font-size:10px;color:var(--muted);font-weight:400;
  display:flex;align-items:center;gap:6px;
}
.saved:before{
  content:"";width:5px;height:5px;background:#6E9E83;border-radius:50%;display:inline-block;
}
.resume-info{
  display:flex;align-items:center;justify-content:space-between;
  margin:0 0 14px;
}
.resume-info b{font-size:13px;font-weight:500}
.resume-info strong{font-size:20px;font-weight:500;color:#526B62}
.primary,.btn.primary{
  display:flex;align-items:center;justify-content:center;gap:10px;
  width:100%;height:46px;border-radius:9px;
  background:var(--teal);color:#fff;border:1px solid var(--teal);
  font-size:13px;font-weight:500;
}
.secondary,.btn.ghost{
  display:flex;align-items:center;justify-content:center;
  width:100%;height:44px;border-radius:9px;
  background:#fff;border:1px solid var(--line);
  font-size:13px;font-weight:500;margin-top:10px;
}
.site-footer{
  margin-top:28px;padding:18px 0 8px;
  border-top:1px solid var(--line);
  color:var(--muted);font-size:10px;line-height:1.6;
}

/* —— Game —— */
#screen-game{padding-top:18px}
.hud{
  display:flex;align-items:flex-end;justify-content:space-between;
  margin-bottom:14px;gap:12px;
}
.hud-left .name{font-size:20px;font-weight:600;line-height:1.2}
.hud-left .sub{display:block;margin-top:4px;font-size:10px;color:var(--muted);font-weight:400}
.hud .time{font-size:23px;font-weight:500;color:#466151;line-height:1}
.grid-wrap{position:relative}
.grid{
  width:100%;aspect-ratio:1;
  display:grid;grid-template-columns:repeat(9,1fr);grid-template-rows:repeat(9,1fr);
  background:#fff;border:1.6px solid var(--grid-edge);border-radius:2px;overflow:hidden;
}
.cell{
  position:relative;min-width:0;min-height:0;padding:0;
  border:0;border-right:1px solid var(--cell-line);border-bottom:1px solid var(--cell-line);
  background:transparent;display:flex;align-items:center;justify-content:center;
  font-size:22px;font-weight:500;line-height:1;color:#2B4038;
  transition:background .12s ease,transform .12s ease;
}
.cell.vr{border-right:1.6px solid var(--box-line)}
.cell.hb{border-bottom:1.6px solid var(--box-line)}
.cell.c8{border-right:0}
.cell.r8{border-bottom:0}
.cell.given{color:var(--ink);font-weight:600}
.cell.locked{color:var(--ink);font-weight:600}
.cell.player{color:var(--teal);font-weight:400}
.cell.peer{background:var(--peer)}
.cell.same{background:var(--same);color:var(--teal);font-weight:500}
.cell.selected{
  background:var(--selected)!important;
  box-shadow:inset 0 0 0 2px var(--teal);
  z-index:1;
}
.cell.conflict{background:var(--bad)!important;color:var(--danger)!important;font-weight:700}
.cell.selected.conflict{box-shadow:inset 0 0 0 2px var(--danger)}
.cell.tap{transform:scale(.92)}
.cell.flash-wrong{animation:wrongPulse .45s ease}
@keyframes wrongPulse{0%,100%{background:var(--bad)}}
.marks{
  display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);
  width:88%;height:88%;color:#526A60;font-size:9px;font-weight:500;line-height:1;
}
.marks span{display:flex;align-items:center;justify-content:center}
.generating{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  background:rgba(247,248,245,.9);color:var(--muted);letter-spacing:.06em;font-size:14px;
}
.game-stats{
  display:flex;gap:28px;padding:14px 0 8px;font-size:11px;color:var(--muted);
}
.game-stats b{font-size:14px;font-weight:500;color:var(--ink);margin-left:6px}
.input-heading{
  display:flex;align-items:center;justify-content:space-between;
  font-size:11px;color:var(--muted);margin:4px 0 12px;
}
.mark-toggle{
  border:1px solid var(--line);background:var(--surface);
  height:34px;display:inline-flex;align-items:center;gap:6px;
  border-radius:7px;padding:0 10px;font-size:11px;color:var(--ink);
}
.mark-toggle svg{width:14px;height:14px}
.mark-toggle .mark-state{
  color:var(--muted);font-size:11px;border-left:1px solid var(--line);padding-left:7px;
}
.mark-toggle.on{background:#E4EFE9;border-color:#A9C3B5}
.pad{
  display:grid;grid-template-columns:repeat(3,1fr);gap:8px;
}
.pad button{
  height:55px;border-radius:8px;border:1px solid #DBE4DE;
  background:#fff;font-size:25px;font-weight:500;color:#2B6253;padding:0;
  transition:transform .1s ease,background .12s ease;
}
.pad button.active{background:#E4EFE9;border-color:#A9C3B5}
.pad button.flash,.mark-toggle.flash{transform:scale(.94)}
.restart{
  display:block;width:100%;text-align:center;
  padding:18px 0 6px;color:var(--muted);font-size:11px;background:transparent;border:0;
}
.toast{
  text-align:center;min-height:1.2em;margin:0 0 8px;
  font-size:13px;color:var(--danger);font-weight:600;opacity:0;transition:opacity .15s ease;
}
.toast.show{opacity:1}

/* —— Result —— */
#screen-result{padding-top:40px;text-align:center}
.completion-symbol{
  width:56px;height:56px;margin:0 auto 18px;border-radius:50%;
  background:#E4EEE6;color:var(--teal);display:grid;place-items:center;
}
.completion-symbol svg{width:26px;height:26px}
.eyebrow{margin:0;color:var(--teal);font-size:11px;letter-spacing:1px}
#screen-result h1{
  margin:12px 0 0;font-size:28px;font-weight:500;letter-spacing:-.3px;
}
.result-msg{margin:12px 0 0;font-size:12px;color:var(--muted)}
.result-stats{
  display:grid;grid-template-columns:repeat(3,1fr);
  margin:28px 0 24px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  padding:22px 0;
}
.result-stats>div{padding:0 6px}
.result-stats>div+div{border-left:1px solid var(--line)}
.result-stats span{display:block;font-size:10px;color:var(--muted);margin-bottom:8px}
.result-stats b{font-size:24px;font-weight:500}
.speed-line{text-align:center;margin:0 0 16px;font-size:13px}
.speed-line.yes{color:var(--teal)}
.speed-line.no{color:var(--muted)}
#screen-result .btn.primary{margin-top:0}
#screen-result .btn.ghost{margin-top:10px}

/* —— Ranking —— */
#screen-board{padding-top:22px}
.back{
  border:0;background:transparent;padding:0;color:var(--muted);font-size:12px;
  display:inline-flex;align-items:center;gap:4px;margin-bottom:14px;
}
.page-title{text-align:center}
.page-title .eyebrow{font-size:9px;letter-spacing:2px}
.page-title h1{margin:10px 0 8px;font-size:24px;font-weight:500}
.page-title p{margin:0;font-size:11px;color:var(--muted)}
.ranking-card{
  margin-top:22px;padding:0 14px 14px;
  border:1px solid var(--line);border-radius:12px;background:#fff;
}
.rank-toolbar{
  display:flex;align-items:center;justify-content:space-between;
  border-bottom:1px solid var(--line);height:56px;
}
.tabs{display:flex;gap:22px;align-items:center;height:100%}
.tabs button{
  height:100%;padding:0;border:0;background:transparent;
  color:var(--muted);font-size:12px;position:relative;
}
.tabs button.on{color:var(--teal);font-weight:600}
.tabs button.on:after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;background:var(--teal);
}
.sync-state{font-size:9px;color:var(--muted);display:flex;align-items:center;gap:5px}
.sync-state:before{content:"";width:5px;height:5px;background:#6E9E83;border-radius:50%}
.chips{display:flex;gap:6px;padding:16px 0;flex-wrap:wrap}
.chips button{
  border:0;background:transparent;font-size:11px;
  width:60px;height:29px;border-radius:6px;color:var(--muted);
}
.chips button.on{background:#E8F0EB;color:var(--teal)}
.table-labels{
  display:grid;grid-template-columns:40px 1fr 70px;
  font-size:11px;color:var(--muted);padding:0 6px 12px;
}
.table-labels span:last-child{text-align:right}
.rank{
  display:grid;grid-template-columns:40px 1fr auto;
  gap:8px;align-items:center;padding:12px 6px;min-height:64px;
  border-top:1px solid #EFF2EF;
}
.rank .idx{color:var(--muted);font-size:13px;font-weight:500}
.rank .idx.first{color:var(--teal)}
.rank .who-wrap{display:flex;align-items:center;gap:9px;min-width:0}
.rank .who{font-size:12px;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.rank .val{font-size:17px;font-weight:500;color:#3F594C;text-align:right}
.rank .mini{width:34px;height:34px;border-radius:50%;overflow:hidden;flex:0 0 auto;background:var(--light)}
.pinned .rank{background:#EEF4EF;border:none;border-radius:9px;margin-top:8px}
.empty{text-align:center;color:var(--muted);padding:40px 0 20px;font-size:13px}
.device-note,.ranking-footnote{
  text-align:center;color:var(--muted);font-size:10px;margin-top:16px;
}

/* —— Overlays / sheets —— */
.overlay{
  position:fixed;inset:0;z-index:20;
  background:#233A3333;backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px);
  display:flex;align-items:center;justify-content:center;padding:20px;
}
.sheet{
  position:relative;width:min(390px,100%);
  background:#FCFDFB;border:1px solid #fff;border-radius:16px;
  padding:28px 22px 22px;box-shadow:0 30px 100px #21342A16;
  max-height:min(90dvh,720px);overflow:auto;
}
.sheet h2,.sheet .sheet-title{margin:0 0 8px;font-size:24px;font-weight:500}
.sheet p.msg{margin:0 0 18px;font-size:12px;color:var(--muted);line-height:1.7}
.modal-close{
  position:absolute;right:16px;top:14px;color:#86958D;
  width:32px;height:32px;display:grid;place-items:center;padding:0;
}
.modal-close svg{width:16px;height:16px}
.label{display:block;font-size:12px;color:var(--ink);margin:10px 0 8px}
.sheet input[type="text"],
.sheet input[type="email"],
.otp-row input{
  box-sizing:border-box;width:100%;height:42px;
  font-size:14px;padding:0 12px;border-radius:7px;
  border:1px solid #D5E0D8;background:#fff;
}
.form-error{color:var(--danger);font-size:12px;margin:8px 0 0;min-height:1.2em}
.field-hint,.sheet .hint{margin:8px 0 0;color:var(--muted);font-size:11px;line-height:1.5}
.setting-row{
  display:flex;justify-content:space-between;align-items:center;
  padding:18px 0;border-top:1px solid var(--line);font-size:13px;
}
.segmented{
  display:flex;background:#EDF1EC;padding:3px;border-radius:7px;font-size:11px;gap:0;
}
.segmented .chip{
  border:0;background:transparent;padding:7px 14px;border-radius:5px;
  color:var(--ink);font-weight:400;
}
.segmented .chip.on{
  background:#fff;color:var(--teal);box-shadow:0 1px 5px #12251C08;font-weight:500;
}
.otp-row{display:flex;gap:8px;margin-top:8px}
.otp-row input{flex:1;min-width:0}
.otp-row button{
  background:#E8F0E9;border:0;border-radius:7px;padding:0 12px;
  font-size:11px;color:var(--teal);white-space:nowrap;height:42px;
}
.auth-divider{
  display:flex;align-items:center;gap:12px;margin:16px 0;
  color:#92A097;font-size:10px;
}
.auth-divider:before,.auth-divider:after{content:"";height:1px;background:var(--line);flex:1}
.danger-text{
  display:block;width:100%;text-align:center;
  font-size:12px;color:var(--danger);padding:18px 0 4px;background:transparent;border:0;
}
#restart-layer .btn.primary{margin-top:8px}
#settings-layer .btn.primary{margin-top:18px}
#login-layer .btn.primary{margin-top:16px}

/* —— Profile editor —— */
#editor .sheet{padding-top:24px}
.profile-identity{
  display:grid;grid-template-columns:68px 1fr;column-gap:16px;align-items:start;
  margin:16px 0 20px;
}
.profile-identity .large-avatar{grid-row:1 / span 3}
.avatar-upload-row{margin-top:10px;grid-column:2}
.upload-btn{
  position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center;gap:8px;
  height:36px;border-radius:7px;border:1px solid var(--line);background:#fff;
  font-size:11px;width:100%;
}
.upload-btn input{position:absolute;inset:0;opacity:0;cursor:pointer}
.picker-header{
  display:flex;align-items:center;justify-content:space-between;margin-bottom:8px;
}
.picker-header h3{margin:0;font-size:15px;font-weight:500}
.picker-header span{font-size:10px;color:var(--muted)}
.avatars{
  display:grid;grid-template-columns:repeat(4,1fr);gap:12px 10px;
  margin:12px 0 16px;
}
.avatars button{
  width:100%;aspect-ratio:1;max-width:72px;margin:0 auto;
  padding:3px;border-radius:50%;border:1.5px solid transparent;
  background:transparent;overflow:visible;position:relative;display:block;
}
.avatars button img{
  width:100%;height:100%;object-fit:cover;border-radius:50%;display:block;
}
.avatars button.on{border-color:var(--teal)}
.avatars button.on:after{
  content:"";position:absolute;right:0;bottom:0;
  width:16px;height:16px;border-radius:50%;
  background:var(--teal);border:2px solid var(--bg);
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m5 12 4 4L19 6'/%3E%3C/svg%3E");
  background-size:10px;background-repeat:no-repeat;background-position:center;
}
.avatar-upload-preview{
  width:36px;height:36px;border-radius:50%;overflow:hidden;
  border:2px solid transparent;background:var(--light);flex:0 0 auto;
  display:inline-block;vertical-align:middle;margin-right:8px;
}
.avatar-upload-preview.on{border-color:var(--teal)}
.profile-actions{
  display:grid;grid-template-columns:1fr 1fr;gap:10px;
  margin-top:8px;padding-top:16px;border-top:1px solid var(--line);
}
.profile-actions .btn{margin:0;height:42px;font-size:12px}
.auth-label{display:none}
#editor-toast.toast{margin:0 0 10px}

@media(min-width:421px){
  .app{padding-left:24px;padding-right:24px}
  .cell{font-size:24px}
}

#logout-btn{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);}