*{box-sizing:border-box}body{margin:0;font-family:system-ui,"Noto Sans","Noto Sans Thai","Noto Sans Lao","Noto Sans Khmer",sans-serif;color:#13293d;background:#f4f8fb}
main{max-width:1100px;margin:auto;padding:20px}.card{background:#fff;border-radius:10px;padding:16px;margin:12px 0;box-shadow:0 1px 3px #0002}
#map{height:520px;border-radius:10px}.warn{background:#fff4d6;border-left:4px solid #e0a800;padding:10px;border-radius:6px}
.tiers{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:14px}.tier h2{margin-top:0}.price{font-size:1.6em;font-weight:700}
button,.btn{background:#1677c9;color:#fff;border:0;padding:9px 16px;border-radius:6px;cursor:pointer;text-decoration:none;display:inline-block}
input,select{padding:8px;margin:4px 0 10px;width:100%;max-width:400px;border:1px solid #bbb;border-radius:6px}
.sev-MODERATE{color:#8a5300}.sev-HIGH{color:#c0392b}.tag{font-size:.8em;background:#eee;padding:2px 6px;border-radius:4px}
footer{text-align:center;color:#4f5d6b;font-size:.85em;padding:20px}table{border-collapse:collapse}td,th{padding:4px 10px;border-bottom:1px solid #ddd;text-align:left}

/* v2.7: grouped nav, mobile layout */
header{background:#0b3c5d;color:#fff;padding:10px 20px;display:flex;flex-wrap:wrap;gap:6px 18px;align-items:center;position:relative;z-index:1000}
header a{color:#cfe8ff;text-decoration:none}header a.on{color:#fff;font-weight:600}.brand{font-weight:700;font-size:1.2em;color:#fff!important;margin-right:8px}
header nav{display:flex;flex-wrap:wrap;gap:4px 18px;align-items:center;flex:1}.navacct{margin-left:auto}
.navg{position:relative}.navg summary{cursor:pointer;list-style:none;color:#cfe8ff;padding:4px 0}.navg summary::-webkit-details-marker{display:none}
.navg summary::after{content:" ▾";font-size:.8em}.navg summary.on{color:#fff;border-bottom:2px solid #5ec2f2}
.navd{position:absolute;top:100%;left:0;background:#0e4a72;border-radius:8px;padding:6px 0;min-width:200px;box-shadow:0 6px 18px #0005;z-index:1001}
.navd a{display:block;padding:7px 14px;white-space:nowrap}.navd a:hover,.navd a:focus{background:#13609a}
.navtoggle{display:none;background:#13609a;margin-left:auto;padding:6px 12px}
#langsw{width:auto;max-width:160px;margin:0 0 0 8px;padding:4px}
img,svg,canvas,video,iframe{max-width:100%}img{height:auto}
pre,code{white-space:pre-wrap;overflow-wrap:anywhere}
.leaflet-container img{max-width:none}
@media (max-width:760px){
 header{padding:10px 14px}.navtoggle{display:inline-block}header nav{display:none;flex-direction:column;align-items:stretch;width:100%;gap:0}header nav.open{display:flex}
 .navacct{margin-left:0}.navg summary{padding:10px 4px;border-top:1px solid #ffffff22}.navd{position:static;box-shadow:none;background:transparent;padding:0 0 6px 10px;min-width:0}
 #langsw{margin:10px 0 4px}
 main{padding:12px}#map{height:380px}
 table{display:block;overflow-x:auto;max-width:100%;-webkit-overflow-scrolling:touch}
 h1{font-size:1.5em}.card{padding:12px}
}
/* v2.7 mobile fixes round 2 */
svg{max-width:100%;height:auto}
.leaflet-container{max-width:100%;overflow:hidden}
#tbl,#dams,.tablewrap{max-width:100%;overflow-x:auto}
#ba{max-width:100%;overflow:hidden}
@media (max-width:760px){main{overflow-wrap:anywhere}#opts,#pick{display:flex;flex-wrap:wrap;gap:4px 12px}#pick label,#opts label{white-space:normal}}
input[type=checkbox],input[type=radio]{width:auto}
/* v2.8 map legend */
.maplegend{background:#fff;padding:8px 10px;border-radius:6px;box-shadow:0 1px 4px rgba(0,0,0,.3);font-size:13px;line-height:1.5;max-width:230px}
.maplegend i{display:inline-block;width:12px;height:12px;border-radius:50%;margin-right:6px;vertical-align:-1px;border:1px solid #333}
@media (max-width:760px){.maplegend{font-size:11px;max-width:170px}}
/* v3.6 accessibility */
.skip{position:absolute;left:-9999px;top:0;background:#fff;color:#000;padding:.5em 1em;z-index:9999}
.skip:focus{left:.5em;top:.5em}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #f5a623;outline-offset:2px}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* v6.5: bigger tap targets for checkboxes/radios on touch screens */
input[type=checkbox],input[type=radio]{padding:0;margin:0 6px 0 0;width:20px;height:20px;min-width:20px;vertical-align:middle;accent-color:#1677c9}
@media (pointer:coarse){input[type=checkbox],input[type=radio]{width:24px;height:24px}}
/* v9.4 mobile tidy-up for field use: bigger tap targets, scrollable tables, readable type, no sideways page scroll */
@media (max-width:760px){
 html{-webkit-text-size-adjust:100%}body{font-size:17px;line-height:1.5}main{padding:10px 12px!important;max-width:100%!important}
 h1{font-size:1.45em;line-height:1.25}h2{font-size:1.15em}
 table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch;max-width:100%;font-size:15px}th,td{padding:8px 6px}
 a.btn,button,.btn,input[type=submit]{min-height:44px;padding:10px 14px;font-size:16px}a.btn{display:inline-block;margin:4px 2px}
 input,select,textarea{font-size:16px;min-height:40px;max-width:100%}
 nav a,header a{display:inline-block;padding:8px 6px}
 img,svg,canvas,video,iframe{max-width:100%;height:auto}.card{padding:12px!important;margin:10px 0!important}
 .grid2{grid-template-columns:1fr!important}#map,.map{height:55vh!important}
}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}.big{font-size:1.15em}.warn{border-left:4px solid #c77700}.ok{border-left:4px solid #2e7d32}
@media print{nav,.btn,button{display:none!important}}