:root{
  --blue:#006EFF;
  --blue-dark:#0052C4;
  --blue-light:#EAF2FF;
  --blue-bg:#F4F8FF;
  --text:#1F2937;
  --text-sub:#6B7280;
  --border:#E2E8F0;
  --white:#ffffff;
  --danger:#E5484D;
  --success:#30A46C;
  --warn:#F5A623;
  --radius:12px;
  --shadow:0 8px 28px rgba(0,110,255,.10);
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;background:var(--blue-bg);color:var(--text);font-size:14px;line-height:1.65;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{text-decoration:none;color:var(--blue)}
a:hover{color:var(--blue-dark)}
input,textarea,select,button{font-family:inherit;font-size:inherit}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:none;border-radius:8px;cursor:pointer;font-size:15px;padding:11px 22px;transition:all .18s ease;user-select:none}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 4px 14px rgba(0,110,255,.30)}
.btn-primary:hover{background:var(--blue-dark);box-shadow:0 6px 18px rgba(0,110,255,.38)}
.btn-primary:disabled{opacity:.6;cursor:not-allowed}
.btn-ghost{background:var(--white);color:var(--blue);border:1px solid var(--blue)}
.btn-ghost:hover{background:var(--blue-light)}
.btn-danger{background:#fff;color:var(--danger);border:1px solid #F3C1C3}
.btn-danger:hover{background:#FFF1F1}
.btn-sm{padding:6px 12px;font-size:13px;border-radius:6px}
.input{width:100%;border:1px solid var(--border);border-radius:8px;padding:11px 14px;outline:none;background:#fff;transition:border-color .18s,box-shadow .18s}
.input:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(0,110,255,.12)}
.input::placeholder{color:#A6B2C3}
.label{display:block;font-size:13px;color:var(--text-sub);margin-bottom:7px;font-weight:500}
.card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}
.tag{display:inline-flex;align-items:center;padding:3px 10px;border-radius:20px;font-size:12px;font-weight:500}
.tag-blue{background:var(--blue-light);color:var(--blue)}
.tag-green{background:#E8F7EF;color:var(--success)}
.tag-gray{background:#F1F4F8;color:var(--text-sub)}
.tag-red{background:#FDECEC;color:var(--danger)}
.tag-orange{background:#FFF4E5;color:var(--warn)}
/* login */
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;background:linear-gradient(160deg,#EAF4FF 0%,#F7FBFF 55%,#EFF6FF 100%)}
.login-card{width:100%;max-width:420px;padding:40px 36px 34px;position:relative;overflow:hidden}
.login-card::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--blue),#4DA3FF)}
.login-card.no-topbar::before{display:none}
.login-head{text-align:center;margin-bottom:30px}
.login-title{font-size:21px;font-weight:700;color:var(--text)}
.login-sub{font-size:13px;color:var(--text-sub);margin-top:6px}
.form-item{margin-bottom:20px}
.login-btn{width:100%;margin-top:6px}
.login-tip{text-align:center;margin-top:18px;font-size:12px;color:#9AA6B8}
.login-err{display:none;background:#FDECEC;color:var(--danger);border:1px solid #F5C6C8;border-radius:8px;padding:10px 14px;font-size:13px;margin-bottom:18px}
.login-err.show{display:block}
.mask{position:fixed;inset:0;background:rgba(23,32,50,.45);display:none;align-items:center;justify-content:center;z-index:120;padding:20px}
.mask.show{display:flex}
.modal{background:#fff;border-radius:16px;max-width:440px;width:100%;padding:28px 26px;box-shadow:0 24px 60px rgba(15,40,90,.28);text-align:center}
.modal h3{font-size:18px;font-weight:700;margin-bottom:10px}
.modal p{font-size:14px;color:var(--text-sub);line-height:1.7;margin-bottom:4px}
.modal .m-actions{display:flex;gap:12px;margin-top:22px;justify-content:center}
.modal .m-actions .btn{flex:1}
@media(max-width:520px){.login-card{padding:26px 18px 22px}.login-title{font-size:18px}.login-head{margin-bottom:24px}.login-sub{margin-top:4px}}
@media(max-width:360px){.login-wrap{padding:14px}.login-title{font-size:16px}.btn{padding:11px 16px}}

/* score page */
.score-card{max-width:440px}
.score-hero{width:52px;height:52px;margin:0 auto 14px;border-radius:16px;background:linear-gradient(135deg,var(--blue),#4DA3FF);color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 20px rgba(0,110,255,.30)}
.grading-box{margin-top:24px;background:var(--blue-light);border:1px solid #D6E6FF;border-radius:14px;padding:26px 18px;text-align:center}
.gb-loading{display:flex;justify-content:center;gap:6px;margin-bottom:12px}
.gb-dot{width:9px;height:9px;border-radius:50%;background:var(--blue);opacity:.25;animation:gbPulse 1.2s infinite}
.gb-dot:nth-child(2){animation-delay:.2s}
.gb-dot:nth-child(3){animation-delay:.4s}
@keyframes gbPulse{0%,100%{opacity:.25;transform:scale(1)}50%{opacity:1;transform:scale(1.25)}}
.gb-title{font-size:16px;font-weight:700;color:var(--blue)}
.gb-desc{font-size:13px;color:var(--text-sub);margin-top:6px;line-height:1.7}
.score-total{background:linear-gradient(135deg,var(--blue) 0%,#3D8CFF 100%);border-radius:16px;padding:22px 16px 20px;text-align:center;color:#fff;box-shadow:0 10px 24px rgba(0,110,255,.25)}
.st-label{font-size:13px;opacity:.85;letter-spacing:2px}
.st-num{margin:6px 0 8px}
.st-num span{font-size:52px;font-weight:800;line-height:1.1;font-variant-numeric:tabular-nums}
.st-num em{font-style:normal;font-size:15px;margin-left:4px;opacity:.9}
.st-grade{display:inline-flex;align-items:center;padding:3px 14px;border-radius:20px;font-size:13px;font-weight:700;background:rgba(255,255,255,.18)}
.st-grade.ok{background:#E8F7EF;color:var(--success)}
.st-grade.no{background:#FDECEC;color:var(--danger)}
.score-stats{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:14px}
.ss-item{background:var(--blue-bg);border:1px solid var(--border);border-radius:12px;padding:14px 12px;text-align:center}
.ss-key{font-size:12px;color:var(--text-sub)}
.ss-val{font-size:20px;font-weight:800;color:var(--text);margin-top:4px;font-variant-numeric:tabular-nums}
.score-name{text-align:center;font-size:12px;color:var(--text-sub);margin-top:14px}
/* score entry on login */
.score-entry{margin-top:20px;border-top:1px dashed var(--border);padding-top:16px}
.score-entry-link{display:flex;align-items:center;gap:12px;padding:12px 14px;border:1px solid var(--border);border-radius:12px;background:var(--blue-bg);transition:all .18s ease}
.score-entry-link:hover{border-color:var(--blue);background:var(--blue-light);box-shadow:0 6px 16px rgba(0,110,255,.12)}
.se-icon{width:38px;height:38px;flex:0 0 auto;border-radius:11px;background:var(--white);color:var(--blue);display:flex;align-items:center;justify-content:center;border:1px solid var(--border)}
.se-text{flex:1;display:flex;flex-direction:column;min-width:0}
.se-text b{font-size:14px;color:var(--text)}
.se-text em{font-style:normal;font-size:12px;color:var(--text-sub);margin-top:1px}
.se-arrow{color:#A6B2C3;flex:0 0 auto;transition:transform .18s ease}
.score-entry-link:hover .se-arrow{transform:translateX(3px);color:var(--blue)}
@media(max-width:360px){.score-stats{grid-template-columns:1fr}.st-num span{font-size:44px}}
.score-meta{display:flex;justify-content:center;gap:20px;flex-wrap:wrap;margin-top:14px;font-size:12px;color:var(--text-sub)}
.score-meta b{color:var(--text);font-weight:600}
@media(max-width:520px){.score-meta{gap:6px 14px}}
.loading-box{margin-top:24px;text-align:center;padding:36px 16px}
.lb-spin{animation:lbRotate 1s linear infinite}
@keyframes lbRotate{to{transform:rotate(360deg)}}
.lb-text{margin-top:14px;font-size:14px;color:var(--text-sub)}
.score-code{display:flex;align-items:center;justify-content:center;gap:10px;margin-top:14px;padding:10px 14px;background:var(--blue-bg);border:1px dashed #BBD5FF;border-radius:10px}
.sc-label{font-size:12px;color:var(--text-sub)}
.sc-value{font-family:Consolas,Menlo,monospace;font-size:14px;font-weight:700;letter-spacing:1px;color:var(--text)}
.score-wm{position:fixed;inset:0;pointer-events:none;z-index:60;background-repeat:repeat;background-size:320px 160px}
/* login flow pages */
.flow-steps{display:flex;align-items:center;justify-content:center;gap:18px;margin-bottom:24px}
.fs-item{display:flex;align-items:center;gap:7px;color:var(--text-sub);font-size:12px}
.fs-dot{width:24px;height:24px;border-radius:50%;background:#EEF2F7;color:var(--text-sub);display:inline-flex;align-items:center;justify-content:center;font-size:12px;font-weight:700}
.fs-item.active .fs-dot{background:var(--blue);color:#fff}
.fs-item.active{color:var(--blue);font-weight:600}
.fs-item.done .fs-dot{background:var(--success);color:#fff}
.confirm-box{display:flex;align-items:center;gap:22px;background:var(--blue-bg);border:1px solid var(--border);border-radius:14px;padding:22px 20px}
.confirm-avatar{width:96px;height:96px;border-radius:50%;background:#E9EEF5;border:2px dashed #C6D2E0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;flex:0 0 auto}
.confirm-avatar i{font-style:normal;font-size:11px;color:#9AA5B1}
.confirm-info{flex:1;display:flex;flex-direction:column;gap:9px}
.ci-row{display:flex;justify-content:space-between;align-items:center;font-size:14px}
.ci-row span{color:var(--text-sub)}
.ci-row b{color:var(--text);font-size:15px}
.notice-list{display:flex;flex-direction:column;gap:12px}
.nl-item{display:flex;gap:13px;background:var(--blue-bg);border:1px solid var(--border);border-radius:12px;padding:14px 15px}
.nl-item svg{flex:0 0 auto;color:var(--blue);margin-top:2px}
.nl-item.warn{background:#FFF7EA;border-color:#FFE0B0}
.nl-item.warn svg{color:var(--warn)}
.nl-item b{font-size:14px;color:var(--text);display:block}
.nl-item p{font-size:13px;color:var(--text-sub);margin-top:3px;line-height:1.65}
.sign-board-wrap{border:1px solid var(--border);border-radius:14px;overflow:hidden;background:#fff}
#signCanvas{display:block;width:100%;height:auto;touch-action:none;cursor:crosshair}
.sign-hint{font-size:12px;color:var(--text-sub);text-align:center;padding:8px 0;background:#FAFBFD;border-top:1px solid var(--border)}
.sign-actions{display:flex;gap:12px;margin-top:16px}
.sign-actions .btn{flex:1}
.sign-tip{font-size:12px;color:#9AA5B1;text-align:center;margin-top:12px}
@media(max-width:520px){.confirm-box{flex-direction:column;text-align:center}.ci-row{flex-direction:column;gap:2px}.nl-item{flex-direction:column}.flow-steps{gap:8px}.fs-txt{display:none}}
/* flow pages mobile enhance */
@media(max-width:520px){
  .flow-steps{gap:10px;margin-bottom:18px}
  .fs-dot{width:22px;height:22px}
  .login-card{padding:22px 16px 20px}
  .confirm-box{padding:18px 14px}
  .confirm-avatar{width:80px;height:80px}
  .confirm-avatar svg{width:28px;height:28px}
  .ci-row{font-size:14px}
  .ci-row b{font-size:14px}
  .notice-list{gap:10px}
  .nl-item{padding:12px 13px;gap:10px}
  .nl-item p{font-size:13px}
  .sign-actions{flex-direction:column;gap:10px}
  .sign-actions .btn{width:100%}
  .sign-board-wrap{border-radius:12px}
  #signCanvas{min-height:150px}
  .sign-hint{font-size:12px;padding:7px 0}
  .flow-steps .fs-txt{display:none}
}
@media(max-width:360px){
  .fs-dot{width:20px;height:20px}
  .login-title{font-size:17px}
  .nl-item b{font-size:13px}
  .sign-tip{font-size:11px}
}
/* unified flow action buttons */
.flow-actions{display:flex;flex-direction:column;gap:12px;margin-top:22px}
.flow-actions .btn{width:100%}
.sign-actions .btn{flex:1}
.sign-actions .btn:first-child{flex:0 0 40%}
@media(min-width:521px){.sign-actions .btn{min-width:150px}}
/* fullscreen signature board */
.expand-btn{margin-top:12px;width:100%}
.full-mask{position:fixed;inset:0;z-index:200;background:#F4F8FF;display:none;flex-direction:column}
.full-mask.show{display:flex}
.full-top{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;background:#fff;border-bottom:1px solid var(--border)}
.full-title{font-size:16px;font-weight:700;color:var(--text)}
.full-board{flex:1;display:flex;align-items:center;justify-content:center;padding:14px;min-height:0}
.full-canvas-box{width:100%;height:100%;display:flex;align-items:center;justify-content:center}
#fullCanvas{max-width:100%;max-height:100%;background:#fff;border:1px solid var(--border);border-radius:14px;box-shadow:0 10px 30px rgba(0,110,255,.10);touch-action:none;cursor:crosshair}
.full-actions{display:flex;justify-content:center;padding:0 14px 10px}
.full-tip{text-align:center;font-size:13px;color:var(--text-sub);padding:0 14px 22px}
/* global no-select / no tap highlight */
*{-webkit-tap-highlight-color:transparent}
body{-webkit-user-select:none;user-select:none}
input,textarea,[contenteditable]{-webkit-user-select:text;user-select:text}
button,.btn,a{-webkit-user-select:none;user-select:none}
button:focus,button:focus-visible,.btn:focus,a:focus{outline:none}
@media print{*{-webkit-user-select:text;user-select:text}}