*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,'PingFang SC',sans-serif;background:#F8FAFC;color:#0F172A;line-height:1.5;min-height:100vh}
:root{--primary:#2563EB;--accent:#10B981;--bg:#F8FAFC;--card:#fff;--muted:#64748B;--border:#E2E8F0;--contact-footer-h:72px;--danger:#EF4444}
.hidden{display:none!important}
.page{padding:16px;max-width:720px;margin:0 auto}
.r143-view{display:none;padding-bottom:12px}
.r143-view.active{display:block}
.hero{background:linear-gradient(135deg,#2563EB,#3B82F6);color:#fff;padding:24px 20px;margin:-12px -16px 16px;border-radius:0 0 20px 20px}
.hero h1{margin:0 0 6px;font-size:22px}
.hero p{margin:0;font-size:13px;opacity:.92}
.top-bar{display:flex;align-items:center;gap:8px;padding:12px 16px;background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50}
.top-bar h1{flex:1;font-size:16px;margin:0;text-align:center}
.tab-row{display:flex;gap:6px;margin-bottom:12px}
.tab-btn{flex:1;padding:8px;border-radius:8px;border:1px solid var(--border);background:#fff;font-size:13px;cursor:pointer}
.tab-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:14px;margin-bottom:10px;cursor:pointer;box-shadow:0 2px 8px rgba(0,0,0,.04)}
.card h3{margin:0 0 6px;font-size:15px}
.card p{margin:0;font-size:13px;color:var(--muted)}
.tag{display:inline-block;padding:2px 8px;border-radius:999px;font-size:10px;margin-right:4px}
.tag-active{background:#EFF6FF;color:var(--primary)}
.tag-closed{background:#F1F5F9;color:var(--muted)}
.tag-pending{background:#FEF3C7;color:#D97706}
.tag-graded{background:#ECFDF5;color:#059669}
.btn{display:inline-block;padding:10px 16px;border-radius:8px;border:none;font-weight:600;cursor:pointer;font-size:14px;text-decoration:none;text-align:center}
.btn-primary{background:var(--primary);color:#fff}
.btn-secondary{background:#fff;border:1px solid var(--border);color:var(--text,#0F172A)}
.btn-block{display:block;width:100%;margin-top:8px}
.btn-sm{padding:6px 12px;font-size:12px}
.form-label{display:block;font-size:13px;color:var(--muted);margin-bottom:4px}
.form-input,.form-textarea,.form-select{width:100%;padding:12px;border:1px solid var(--border);border-radius:8px;margin:4px 0 12px;font-size:14px}
.form-textarea{min-height:100px;resize:vertical}
.drop-zone{border:2px dashed var(--border);border-radius:12px;padding:24px;text-align:center;background:#fff;margin:12px 0;color:var(--muted)}
.drop-zone.dragover{border-color:var(--primary);background:#EFF6FF}
.file-list{font-size:12px;color:var(--muted);margin:8px 0}
.sub-row{display:flex;align-items:center;gap:10px;padding:12px;background:var(--card);border:1px solid var(--border);border-radius:10px;margin-bottom:8px}
.sub-row strong{flex:1}
.grade-layout{display:grid;gap:12px}
@media(min-width:640px){.grade-layout{grid-template-columns:1fr 1fr}}
.grade-panel{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:14px}
.quick-chips{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0}
.chip{padding:6px 10px;border-radius:999px;border:1px solid var(--border);background:#fff;font-size:12px;cursor:pointer}
.chip:hover{background:#EFF6FF;border-color:var(--primary)}
.annotate-canvas{width:100%;border:1px solid var(--border);border-radius:8px;touch-action:none;background:#fff}
.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:12px}
.stat-box{background:var(--card);border-radius:10px;padding:12px;text-align:center;border:1px solid var(--border)}
.stat-box strong{display:block;font-size:20px;color:var(--primary)}
.empty{padding:40px;text-align:center;color:var(--muted)}
.r143-toast{position:fixed;bottom:calc(var(--contact-footer-h) + 16px);left:50%;transform:translateX(-50%);background:rgba(0,0,0,.85);color:#fff;padding:10px 18px;border-radius:999px;z-index:999;opacity:0;transition:opacity .2s;font-size:14px}
.r143-toast.show{opacity:1}
.toast-success{background:#065f46}
.toast-error{background:#991b1b}
body.has-contact-footer{padding-bottom:calc(var(--contact-footer-h) + env(safe-area-inset-bottom))}
body.has-contact-footer .zw-root .zw-fab{bottom:calc(var(--contact-footer-h) + 12px + env(safe-area-inset-bottom))}
.contact-footer{position:fixed;left:0;right:0;bottom:0;z-index:110;padding:10px 16px calc(10px + env(safe-area-inset-bottom));background:#1a1a1a;color:#fff;text-align:center}
.contact-footer__btns{display:grid;grid-template-columns:repeat(3,minmax(0,88px));gap:8px;max-width:320px;margin:0 auto 6px;justify-content:center}
.contact-footer__cta,.contact-footer__btn{padding:.48rem .2rem;border-radius:999px;font-size:.72rem;text-decoration:none;border:none;cursor:pointer;display:block;text-align:center}
.contact-footer__cta{background:#c41e1e!important;color:#fff!important}
.contact-footer__btn{background:#333;color:#fff}
.contact-footer__brand{font-size:11px;opacity:.7;margin:0}
.share-main{padding:20px 16px;max-width:480px;margin:0 auto}
.share-card{background:var(--card);border-radius:12px;padding:24px;text-align:center;border:1px solid var(--border)}
.chart-canvas{width:100%;height:140px;margin:12px 0}