*{box-sizing:border-box}body{margin:0;background:#f5f5f0;color:#263d32;font:16px/1.5 "Segoe UI",Arial,sans-serif}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}[hidden]{display:none!important}
main{max-width:780px;margin:0 auto;padding:28px 24px 70px}header{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:35px;font-size:.9rem}header a{font-weight:650;color:#263d32;text-decoration:none}#accuracy{font-variant-numeric:tabular-nums;color:#637063;font-size:.82rem}
button{border:1px solid #cdd7c9;border-radius:7px;background:#fffefa;color:#294632;min-height:44px;padding:10px 18px;cursor:pointer}button:hover:not(:disabled){background:#edf2e7}button:disabled{opacity:.4;cursor:default}button.primary{background:#234a3b;border-color:#234a3b;color:#fff}button.primary:hover:not(:disabled){background:#35604a}
:focus-visible{outline:3px solid #b18b30;outline-offset:3px}a{color:#315641;text-underline-offset:3px}.toolbar{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:28px}.modes{display:flex;background:#e7ece2;border-radius:8px;padding:3px}.modes button{background:transparent;border:0;padding:7px 15px;min-height:38px;font-size:.84rem}.modes button[aria-pressed=true]{background:#fffefa;box-shadow:0 1px 3px #25462d18}
details.filters{position:relative}summary{cursor:pointer;list-style:none;min-height:44px;display:flex;align-items:center;color:#637063;font-size:.82rem;padding:0 4px}summary::-webkit-details-marker{display:none}summary:after{content:" +";margin-left:6px}details[open] summary:after{content:" -"}.filter-fields{position:absolute;z-index:2;right:0;top:46px;width:285px;background:#fffefa;border:1px solid #d3dccf;box-shadow:0 8px 24px #17311d15;border-radius:9px;padding:18px;display:grid;gap:16px}
label{display:block;font-size:.8rem}select,input[type=text],input[type=number]{width:100%;min-height:44px;padding:10px;border:1px solid #cbd5c6;border-radius:6px;background:#fffefa;color:#263d32;margin-top:5px}select:disabled,input:disabled{background:#f0f2e9;color:#7b8579}.checkbox{display:flex;align-items:center;gap:9px;min-height:30px}.checkbox input{width:17px;height:17px;accent-color:#234a3b}
h1{font-size:clamp(1.2rem,2.8vw,1.5rem);font-weight:500;line-height:1.55;margin:0 0 26px;letter-spacing:-.015em}fieldset{border:0;margin:0;padding:0;min-width:0}.choices{display:grid;gap:10px}.choice{display:flex;align-items:center;gap:13px;border:1px solid #d4ddcf;background:#fffefa;border-radius:8px;min-height:58px;padding:15px 17px;cursor:pointer;font-size:.94rem;line-height:1.45}.choice:hover{border-color:#8ca17f}.choice.selected{border-color:#7a946b;background:#eef4e5}.choice input{margin:0;min-width:18px;width:18px;height:18px;accent-color:#234a3b}
.location-fields{display:grid;grid-template-columns:1fr 1fr;gap:18px 20px}.location-fields label small{font-size:.69rem;color:#697767;margin-left:4px}input:disabled,select:disabled{opacity:.7}.actions{display:flex;justify-content:flex-end;margin-top:25px}.actions button{min-width:116px}.empty{padding:40px 0}.empty p{color:#637063;margin:0 0 18px}#notice{padding:12px 15px;background:#fff0d6;border:1px solid #e2c99b;border-radius:7px;font-size:.83rem;margin:0 0 22px}
.correction{scroll-margin-top:20px}.result-heading{font-size:1.1rem;font-weight:650;margin:0 0 12px;color:#235538}.answer-result{padding:22px 24px;background:#e8f1e2;border-left:5px solid #397048;border-radius:8px}.correct-answer{color:#174a2b;font-size:clamp(1.5rem,3.8vw,2rem);font-weight:700;line-height:1.3;margin:0;overflow-wrap:anywhere}.your-answer{display:block;color:#525e51;font-size:.94rem;font-weight:400;line-height:1.5;margin:10px 0 0}.explanation{font-size:1rem;color:#3d513e;margin:18px 0}.source{border-top:1px solid #d4ddcf;padding-top:16px;margin-top:20px;font-size:.92rem}.source-line{font-weight:600;line-height:1.65}.source p{margin:8px 0;color:#526450;font-size:.94rem}.scan-links{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}.scan-link{font-size:.9rem;min-height:44px}.layer-results{list-style:none;padding:0;margin:0;display:grid;gap:10px}.layer-results li{display:flex;align-items:flex-start;gap:14px;padding:18px 20px;background:#e8f1e2;border-radius:8px}.layer-results li>div{min-width:0}.layer-mark{color:#235538;font-size:1.6rem;line-height:1.3;font-weight:bold;font-family:Arial,sans-serif;flex:0 0 24px}.layer-mark.wrong{color:#9b3e32}.correct-value{color:#174a2b;display:block;font-size:clamp(1.18rem,3vw,1.5rem);font-weight:700;line-height:1.4;overflow-wrap:anywhere}
.location-fields legend{font-size:.8rem;padding:0}.location-fields legend small{font-size:.69rem;color:#697767;margin-left:4px}.location-list{margin-top:5px;border:1px solid #cbd5c6;border-radius:6px;background:#fffefa;max-height:280px;overflow-y:auto;scroll-padding:6px}.location-choice{display:flex;align-items:center;gap:10px;min-height:44px;padding:10px 12px;cursor:pointer;line-height:1.4}.location-choice+.location-choice{border-top:1px solid #e3e8df}.location-choice:hover{background:#f4f6ef}.location-choice.selected{background:#e7efdf}.location-choice input{margin:0;flex:0 0 17px;width:17px;height:17px;accent-color:#234a3b}.location-choice:focus-within{outline:2px solid #b18b30;outline-offset:-2px}.location-choice input:focus-visible{outline:none}.location-fields fieldset:disabled .location-choice{cursor:default;color:#7b8579}.location-hint{padding:12px;margin:0;font-size:.8rem;color:#697767}
@media(max-width:600px){main{padding:22px 18px 45px}header{margin-bottom:27px}.toolbar{margin-bottom:24px}.modes button{padding:7px 12px}.choice{padding:13px;font-size:.9rem}.location-fields{grid-template-columns:1fr;gap:14px}h1{font-size:1.22rem}.filter-fields{width:min(285px,calc(100vw - 36px))}.source-line{line-height:1.65}.source a{white-space:nowrap}.actions button{width:100%;min-height:46px}}

.incorrect-result{padding:22px 24px;background:#fff2c4;border-left:5px solid #b88918;border-radius:8px;margin-bottom:14px}.incorrect-result .result-heading{color:#765309}.incorrect-answer{color:#624818;font-size:1.12rem;font-weight:600;line-height:1.4;margin:0;overflow-wrap:anywhere}
.correction:focus,#stem:focus{outline:none}
.header-actions{display:flex;align-items:center;gap:12px}.header-actions form{margin:0}.signout{font-size:.78rem;border:0;background:transparent;padding:8px 0;color:#526450;white-space:nowrap}.auth-page{max-width:480px;padding-top:clamp(36px,12vh,120px)}.auth-home{font-weight:650;text-decoration:none}.auth-card{margin-top:36px}.auth-card h1{font-size:1.75rem;font-weight:650}.auth-card p{overflow-wrap:anywhere}.auth-note{font-size:.9rem;color:#526450}.google-signin{width:100%;font-weight:600;min-height:48px}.auth-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}.auth-actions form{margin:0}.button-link{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 18px;border-radius:7px;text-decoration:none}.button-link.primary{background:#234a3b;color:#fff}
.scan-dialog{padding:0;border:0;border-radius:12px;background:#18211c;color:#fff;width:calc(100vw - 48px);height:calc(100dvh - 48px);max-width:1400px;max-height:none;overflow:hidden;box-shadow:0 20px 90px #0008}
.scan-dialog::backdrop{background:#0b1715c9}
.scan-shell{display:flex;flex-direction:column;height:100%;min-height:0}
.scan-header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 16px;background:#f5f5f0;color:#263d32;flex:none}
.scan-header h2{font-size:1rem;line-height:1.4;font-weight:600;margin:0;min-width:0;overflow-wrap:anywhere}
.scan-close{flex:none;display:flex;align-items:center;gap:12px;min-width:90px}
.scan-close span{font-size:1.5rem;line-height:1}
.scan-tools{display:flex;align-items:center;gap:8px;padding:8px 16px;background:#e7ece2;color:#263d32;flex:none;flex-wrap:wrap}
.scan-tools button{min-width:46px;padding:7px 12px;line-height:1.2;font-size:.95rem;touch-action:manipulation}
.scan-tools button[data-zoom=in],.scan-tools button[data-zoom=out]{font-size:1.5rem}
.scan-help{font-size:.8rem;color:#526450;margin-left:auto}
.scan-viewport{flex:1;min-height:0;position:relative;overflow:hidden;touch-action:none;overscroll-behavior:contain;user-select:none;-webkit-user-select:none}
.scan-viewport:focus-visible{outline-offset:-4px}
.scan-viewport.zoomed{cursor:grab}.scan-viewport.dragging{cursor:grabbing}
.scan-image{position:absolute;top:0;left:0;max-width:none;transform-origin:0 0;will-change:transform;pointer-events:none;user-select:none;-webkit-user-select:none}
.scan-status{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:12px;text-align:center;padding:24px}
.scan-status p{margin:0}
@media(max-width:600px){
 .answer-result,.incorrect-result{padding:18px}.layer-results li{padding:16px;gap:10px}
 .scan-dialog{width:100%;height:100dvh;max-width:none;max-height:none;margin:0;border-radius:0}
 .scan-header{padding:calc(10px + env(safe-area-inset-top)) 12px 10px}.scan-header h2{font-size:.9rem}
 .scan-tools{padding:8px 12px;gap:8px}.scan-help{flex-basis:100%;margin-left:0;font-size:.78rem}
 .scan-shell{padding-bottom:env(safe-area-inset-bottom)}
}