:root{--ink:#17251f;--muted:#69766f;--green:#176b4d;--green-dark:#15352f;--green-soft:#e5f0e9;--gold:#bf9147;--line:#d5ddd7;--paper:#eef2ee;--white:#fff;--shadow:0 16px 42px rgba(24,48,37,.09);--safe-top:env(safe-area-inset-top,0px);--safe-bottom:env(safe-area-inset-bottom,0px)}
*{box-sizing:border-box}html{background:var(--paper)}body{margin:0;min-width:320px;color:var(--ink);background:radial-gradient(circle at 8% -5%,#dbe8df 0,transparent 25%),var(--paper);font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","PingFang SC","Helvetica Neue",sans-serif;letter-spacing:0;-webkit-font-smoothing:antialiased}button,input,select{font:inherit;letter-spacing:0}button{color:inherit}button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid rgba(23,107,77,.18);outline-offset:2px}.app-shell{min-height:100svh;padding:calc(14px + var(--safe-top)) 16px calc(38px + var(--safe-bottom))}.topbar{max-width:1080px;height:58px;margin:0 auto 18px;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{display:flex;align-items:center;gap:12px}.brand-icon{width:44px;height:44px;border-radius:11px;box-shadow:0 8px 22px rgba(16,43,39,.22)}.brand h1{margin:0;font-size:20px;line-height:1.1;font-weight:780}.brand p{margin:4px 0 0;color:var(--muted);font-size:11px}.icon-button{width:40px;height:40px;display:grid;place-items:center;border:1px solid var(--line);border-radius:9px;background:rgba(255,255,255,.86);cursor:pointer}.icon-button svg{width:20px;height:20px;stroke-width:1.8}main{max-width:1080px;margin:0 auto}.panel{padding:22px;border:1px solid rgba(198,210,201,.9);border-radius:10px;background:rgba(255,255,255,.95);box-shadow:var(--shadow)}.panel-heading,.result-summary{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;margin-bottom:22px}.eyebrow{display:block;margin-bottom:5px;color:var(--green);font-size:11px;font-weight:780}.panel-heading h2,.result-summary h2{margin:0;font-size:22px;line-height:1.25}.source-badge,.complete-badge{flex:0 0 auto;display:flex;align-items:center;gap:6px;padding:8px 10px;border-radius:999px;color:var(--green);background:var(--green-soft);font-size:11px;font-weight:730}.source-badge svg,.complete-badge svg{width:15px;height:15px}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:17px}.field{min-width:0}.field.full,.toggle-row.full{grid-column:1/-1}.field label,.field legend{display:block;margin:0 0 8px;padding:0;color:#4f5e56;font-size:12px;font-weight:650}.field small{display:block;margin-top:6px;color:#879189;font-size:10px;line-height:1.4}.field input,.field select{width:100%;height:46px;padding:0 12px;border:1px solid #cbd4cd;border-radius:8px;background:#fafbf9;color:var(--ink);font-size:15px;outline:none}.field input:focus,.field select:focus{border-color:var(--green);box-shadow:0 0 0 4px rgba(23,107,77,.07)}fieldset.field{margin:0;border:0;padding:0}.segmented{display:grid;grid-template-columns:repeat(2,1fr);gap:3px;padding:3px;border-radius:9px;background:#e9ede9}.segment{min-height:42px;display:flex;align-items:center;justify-content:center;gap:7px;border:0;border-radius:7px;background:transparent;color:var(--muted);font-size:12px;cursor:pointer}.segment svg{width:17px;height:17px}.segment.active{background:#fff;color:var(--ink);font-weight:700;box-shadow:0 1px 6px rgba(20,35,28,.11)}.range-field{display:none}.range-field.visible{display:block}.toggle-row{min-height:66px;display:flex;align-items:center;gap:14px;padding:12px 14px;border:1px solid var(--line);border-radius:9px;background:#f8faf8;cursor:pointer}.toggle-row>span:first-child{min-width:0;flex:1}.toggle-row strong{display:block;font-size:13px}.toggle-row small{display:block;margin-top:4px;color:var(--muted);font-size:10px;line-height:1.35}.toggle-row input{position:absolute;opacity:0;pointer-events:none}.toggle{position:relative;flex:0 0 auto;width:46px;height:27px;border-radius:999px;background:#cbd3cd;transition:160ms ease}.toggle::after{content:"";position:absolute;top:3px;left:3px;width:21px;height:21px;border-radius:50%;background:#fff;box-shadow:0 1px 4px rgba(0,0,0,.2);transition:160ms ease}.toggle-row input:checked+.toggle{background:var(--green)}.toggle-row input:checked+.toggle::after{transform:translateX(19px)}.data-note{display:flex;align-items:flex-start;gap:9px;margin-top:18px;padding:12px 13px;border-left:3px solid var(--gold);background:#fbf6ea;color:#675637;font-size:11px;line-height:1.55}.data-note svg{flex:0 0 auto;width:18px;height:18px;margin-top:1px}.generate-button{width:100%;min-height:56px;margin-top:15px;display:flex;align-items:center;justify-content:center;gap:9px;border:0;border-radius:10px;background:var(--green);color:#fff;font-weight:740;cursor:pointer;box-shadow:0 12px 26px rgba(23,107,77,.21)}.generate-button:hover{background:#115d43}.generate-button:disabled{opacity:.6;cursor:wait}.generate-button svg{width:21px;height:21px}.progress-panel{margin-top:14px}.progress-head{display:flex;align-items:center;gap:18px}.progress-head strong{display:block;font-size:14px}.progress-head small{display:block;margin-top:4px;color:var(--muted);font-size:11px}.progress-track{height:5px;margin-top:17px;overflow:hidden;border-radius:999px;background:#e2e8e3}.progress-track span{display:block;width:10%;height:100%;border-radius:inherit;background:var(--green);transition:width 240ms ease}.contour-loader{position:relative;flex:0 0 auto;width:62px;height:42px}.contour-loader span{position:absolute;inset:auto 0;height:21px;border:2px solid var(--green);border-color:var(--green) transparent transparent transparent;border-radius:50%}.contour-loader span:nth-child(1){top:0;transform:scale(.62)}.contour-loader span:nth-child(2){top:10px;transform:scale(.82);opacity:.72}.contour-loader span:nth-child(3){top:20px;opacity:.42}.results{margin-top:22px}.result-summary{padding:0 3px}.result-summary h2{font-size:24px}.result-summary p{margin:6px 0 0;color:var(--muted);font-size:12px}.map-card{margin:0 0 16px;padding:17px;border:1px solid var(--line);border-radius:10px;background:#fff;box-shadow:var(--shadow)}.map-card-head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:13px}.map-card-head>div{display:flex;align-items:center;gap:10px}.map-card-head span{width:28px;height:24px;display:grid;place-items:center;border-radius:6px;background:var(--green-dark);color:#fff;font-size:10px;font-weight:750}.map-card-head h3{margin:0;font-size:16px}.canvas-shell{overflow:hidden;border:1px solid #cbd4ce;border-radius:8px;background:#edf1ee;aspect-ratio:10/7}canvas{display:block;width:100%;height:100%;object-fit:contain;background:#f8faf8}.download-button{min-height:38px;display:flex;align-items:center;justify-content:center;gap:6px;padding:0 12px;border:1px solid var(--line);border-radius:8px;background:#fff;font-size:11px;cursor:pointer}.download-button.primary{border-color:var(--green);background:var(--green);color:#fff}.download-button svg{width:17px;height:17px}.data-actions{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.data-button{min-height:65px;display:flex;align-items:center;gap:11px;padding:10px 13px;text-align:left;border:1px solid var(--line);border-radius:9px;background:#fff;cursor:pointer}.data-button>svg{width:22px;height:22px;color:var(--green)}.data-button strong,.data-button small{display:block}.data-button strong{font-size:12px}.data-button small{margin-top:4px;color:var(--muted);font-size:10px}.source-note{margin:13px 2px 0;color:var(--muted);font-size:10px;line-height:1.6}dialog{width:min(420px,calc(100% - 28px));padding:0;border:1px solid var(--line);border-radius:10px;box-shadow:0 28px 90px rgba(18,30,23,.28)}dialog::backdrop{background:rgba(14,25,19,.38);backdrop-filter:blur(5px)}.dialog-head{display:flex;align-items:center;justify-content:space-between;padding:18px 18px 8px}.dialog-head h2{margin:0;font-size:18px}.dialog-body{padding:5px 18px 20px;color:var(--muted);font-size:13px;line-height:1.7}.toast{position:fixed;left:50%;bottom:calc(20px + var(--safe-bottom));z-index:40;max-width:calc(100% - 28px);transform:translate(-50%,20px);padding:10px 14px;border-radius:8px;background:var(--green-dark);color:#fff;font-size:12px;opacity:0;pointer-events:none;transition:180ms ease}.toast.show{opacity:1;transform:translate(-50%,0)}
@media(max-width:720px){.form-grid{grid-template-columns:1fr}.field.full,.toggle-row.full{grid-column:auto}.panel{padding:17px}.panel-heading h2{font-size:20px}.canvas-shell{aspect-ratio:10/7}.data-actions{grid-template-columns:1fr}}
@media(max-width:480px){.app-shell{padding-left:10px;padding-right:10px}.topbar{margin-bottom:11px}.brand p{display:none}.brand-icon{width:39px;height:39px}.brand h1{font-size:18px}.panel{padding:15px}.panel-heading{margin-bottom:18px}.source-badge{padding:7px 8px}.map-card{padding:12px}.map-card-head{align-items:flex-start}.map-card-head>div{align-items:flex-start}.download-button{min-width:96px}.result-summary{display:block}.complete-badge{width:max-content;margin-top:9px}.result-summary h2{font-size:21px}.canvas-shell{aspect-ratio:10/7}}
.segmented{grid-template-columns:repeat(3,1fr)}.range-field,.bbox-field,.admin-field{display:none}.range-field.visible,.bbox-field.visible,.admin-field.visible{display:block}.advanced{border:1px solid var(--line);border-radius:9px;background:#f8faf8}.advanced summary{min-height:48px;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:0 13px;cursor:pointer;list-style:none;color:#425149;font-size:12px;font-weight:700}.advanced summary::-webkit-details-marker{display:none}.advanced summary>span{display:flex;align-items:center;gap:7px}.advanced summary svg{width:17px;height:17px}.advanced[open] summary>svg{transform:rotate(180deg)}.option-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;padding:0 11px 11px}.check-option{min-height:57px;display:flex;align-items:flex-start;gap:9px;padding:10px;border:1px solid #dce3dd;border-radius:8px;background:#fff;cursor:pointer}.check-option input{width:17px;height:17px;margin:1px 0 0;accent-color:var(--green)}.check-option span{min-width:0}.check-option strong,.check-option small{display:block}.check-option strong{font-size:11px}.check-option small{margin-top:3px;color:var(--muted);font-size:9px;line-height:1.35}.data-actions{grid-template-columns:repeat(3,1fr)}
@media(max-width:720px){.segmented{grid-template-columns:1fr}.option-grid{grid-template-columns:1fr}.data-actions{grid-template-columns:1fr}}
.advanced.full{grid-column:1/-1}@media(max-width:720px){.advanced.full{grid-column:auto}}
.simple-form{display:grid;grid-template-columns:1fr;gap:18px}.simple-form .field.full{grid-column:auto}.quick-buttons,.range-picker{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin-top:8px}.quick-buttons button,.range-picker button{min-height:39px;border:1px solid var(--line);border-radius:8px;background:#f7f9f7;color:var(--muted);font-size:12px;cursor:pointer}.quick-buttons button.active,.range-picker button.active{border-color:#91b8a5;background:var(--green-soft);color:var(--green);font-weight:720}.output-options{margin:0;padding:0;border:0}.output-options legend{margin-bottom:8px}.output-options .option-grid{padding:0}.output-options .check-option{min-height:61px}.map-card[hidden]{display:none!important}
@media(max-width:480px){.quick-buttons,.range-picker{gap:5px}.quick-buttons button,.range-picker button{min-height:38px;font-size:11px}.output-options .option-grid{grid-template-columns:1fr 1fr}.output-options .check-option{min-height:70px}.output-options .check-option small{font-size:8px}}
/* teacher-dem-4 additions */
.workflow-tabs{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin-bottom:16px}.workflow-tabs span{padding:9px 8px;border-radius:999px;background:#eef4f0;color:#176b4d;text-align:center;font-size:11px;font-weight:720}.teacher-form{gap:16px}.form-step{padding:14px;border:1px solid var(--line);border-radius:12px;background:#fbfcfb}.step-title{display:flex;align-items:flex-start;gap:10px;margin-bottom:12px}.step-title>span{width:28px;height:28px;display:grid;place-items:center;border-radius:50%;background:var(--green);color:#fff;font-weight:800}.step-title strong{display:block;font-size:15px}.step-title small{display:block;margin-top:3px;color:var(--muted);font-size:10px;line-height:1.45}.inline-action{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:8px}.inline-action button,.map-tools button{min-height:46px;padding:0 14px;border:1px solid #b8c9bf;border-radius:8px;background:#fff;color:var(--green);font-size:12px;font-weight:720;cursor:pointer}.small-action{grid-template-columns:minmax(0,1fr) 110px}.selector-map{height:330px;border:1px solid #cbd4ce;border-radius:12px;overflow:hidden;background:#e8eee9}.map-tools{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-top:9px}.bbox-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin-top:10px}.compact-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.range-readout{margin-top:10px;padding:10px 12px;border-radius:8px;background:#eef4f0;color:#325145;font-size:12px;font-weight:650}.quick-buttons{grid-template-columns:repeat(7,1fr)}.data-actions{grid-template-columns:repeat(4,1fr)}.leaflet-container{font-family:-apple-system,"PingFang SC",sans-serif}.leaflet-control-attribution{font-size:9px!important}.canvas-shell{aspect-ratio:16/9}
@media(max-width:720px){.workflow-tabs{grid-template-columns:repeat(2,1fr)}.map-tools,.bbox-grid,.compact-grid,.data-actions{grid-template-columns:1fr}.selector-map{height:280px}.quick-buttons{grid-template-columns:repeat(4,1fr)}}
@media(max-width:480px){.workflow-tabs span{font-size:10px}.inline-action{grid-template-columns:1fr}.small-action{grid-template-columns:1fr}.selector-map{height:245px}.quick-buttons{grid-template-columns:repeat(3,1fr)}.output-options .option-grid{grid-template-columns:1fr}}
/* v4.1 map fallback: prevents blank range selector when external Leaflet CDN is unavailable */
.selector-map{position:relative;isolation:isolate;min-height:260px}
.fallback-map{cursor:grab;background:#dfe8e2;touch-action:none;user-select:none}
.fallback-map:active{cursor:grabbing}.fallback-tiles{position:absolute;inset:0;overflow:hidden;background:linear-gradient(45deg,#dfe8e2 25%,#edf3ef 25%,#edf3ef 50%,#dfe8e2 50%,#dfe8e2 75%,#edf3ef 75%);background-size:32px 32px}.fallback-tiles img{position:absolute;width:256px;height:256px;user-select:none;-webkit-user-drag:none}.fallback-bbox{position:absolute;z-index:3;border:2px solid #176b4d;background:rgba(23,107,77,.08);box-shadow:0 0 0 9999px rgba(255,255,255,.08);pointer-events:none}.fallback-marker{position:absolute;z-index:4;width:18px;height:18px;margin:-18px 0 0 -9px;border-radius:50% 50% 50% 0;background:#bf5147;border:2px solid #fff;box-shadow:0 2px 8px rgba(0,0,0,.25);transform:rotate(-45deg);pointer-events:none}.fallback-controls{position:absolute;z-index:5;top:10px;left:10px;display:grid;border:1px solid rgba(0,0,0,.18);border-radius:8px;overflow:hidden;background:#fff;box-shadow:0 2px 8px rgba(0,0,0,.12)}.fallback-controls button{width:34px;height:32px;border:0;border-bottom:1px solid #e1e5e2;background:#fff;font-size:18px;line-height:1;cursor:pointer}.fallback-controls button:last-child{border-bottom:0}.fallback-tip{position:absolute;z-index:5;left:10px;right:10px;bottom:10px;padding:7px 9px;border-radius:999px;background:rgba(21,53,47,.84);color:#fff;text-align:center;font-size:10px;pointer-events:none}.leaflet-container{min-height:260px}

/* v5.1 内置地图：完全不依赖 Leaflet/CDN，防止地图视窗空白 */
.selector-map{position:relative;min-height:330px;background:#e8eee9}
.fallback-map{position:relative;overflow:hidden;background:linear-gradient(135deg,#dce9df 0%,#eef4ef 45%,#d7e5dd 100%);touch-action:none}
.fallback-tiles{position:absolute;inset:0;overflow:hidden;background:radial-gradient(circle at 25% 35%,rgba(116,143,104,.30),transparent 26%),radial-gradient(circle at 75% 70%,rgba(95,132,145,.22),transparent 30%),linear-gradient(45deg,rgba(255,255,255,.28) 25%,transparent 25%,transparent 50%,rgba(255,255,255,.28) 50%,rgba(255,255,255,.28) 75%,transparent 75%);background-size:100% 100%,100% 100%,32px 32px}
.fallback-grid-line{position:absolute;z-index:1;background:rgba(36,77,64,.22);pointer-events:none}.fallback-grid-line.v{top:0;bottom:0;width:1px}.fallback-grid-line.h{left:0;right:0;height:1px}.fallback-grid-label{position:absolute;z-index:2;padding:2px 5px;border-radius:999px;background:rgba(255,255,255,.72);color:#355247;font-size:10px;font-weight:700;white-space:nowrap;pointer-events:none}.fallback-grid-label.lon{top:8px;transform:translateX(-50%)}.fallback-grid-label.lat{left:8px;transform:translateY(-50%)}.fallback-center-label{position:absolute;z-index:2;right:10px;top:10px;padding:6px 9px;border-radius:999px;background:rgba(255,255,255,.82);color:#244d40;font-size:10px;font-weight:750;box-shadow:0 2px 8px rgba(0,0,0,.08);pointer-events:none}
.fallback-bbox{position:absolute;z-index:3;border:2px solid #176b4d;background:rgba(23,107,77,.10);box-shadow:0 0 0 9999px rgba(255,255,255,.10);pointer-events:none}.fallback-marker{position:absolute;z-index:4;width:18px;height:18px;margin:-18px 0 0 -9px;border-radius:50% 50% 50% 0;background:#bf5147;border:2px solid #fff;box-shadow:0 2px 8px rgba(0,0,0,.25);transform:rotate(-45deg);pointer-events:none}.fallback-controls{position:absolute;z-index:5;top:10px;left:10px;display:grid;border:1px solid rgba(0,0,0,.18);border-radius:8px;overflow:hidden;background:#fff;box-shadow:0 2px 8px rgba(0,0,0,.12)}.fallback-controls button{width:34px;height:32px;border:0;border-bottom:1px solid #e1e5e2;background:#fff;font-size:18px;line-height:1;cursor:pointer}.fallback-controls button:last-child{border-bottom:0}.fallback-tip{position:absolute;z-index:5;left:10px;right:10px;bottom:10px;padding:7px 9px;border-radius:999px;background:rgba(21,53,47,.84);color:#fff;text-align:center;font-size:10px;pointer-events:none}


/* v5.2: 内置定位图增强，支持拖动范围框与四角缩放 */
.selector-map{position:relative;min-height:360px;background:#dfe9e1}
.fallback-map{cursor:grab;background:linear-gradient(135deg,#d8e7dc 0%,#f2f7f0 45%,#d2e2d7 100%);touch-action:none;user-select:none}
.fallback-map:active{cursor:grabbing}
.fallback-tiles{position:absolute;inset:0;overflow:hidden;background:radial-gradient(circle at 18% 28%,rgba(92,130,88,.25),transparent 25%),radial-gradient(circle at 76% 35%,rgba(142,118,77,.22),transparent 28%),radial-gradient(circle at 62% 78%,rgba(63,111,136,.18),transparent 34%),linear-gradient(45deg,rgba(255,255,255,.25) 25%,transparent 25%,transparent 50%,rgba(255,255,255,.25) 50%,rgba(255,255,255,.25) 75%,transparent 75%);background-size:100% 100%,100% 100%,100% 100%,34px 34px}
.fallback-landform{position:absolute;z-index:0;transform:translate(-50%,-50%) rotate(-18deg);border-radius:50%;pointer-events:none;filter:blur(.2px)}
.fallback-landform.ridge{background:repeating-radial-gradient(ellipse at center,rgba(76,111,72,.22) 0 4px,transparent 5px 11px)}
.fallback-landform.mountain{background:repeating-radial-gradient(ellipse at center,rgba(129,98,61,.22) 0 4px,transparent 5px 12px)}
.fallback-landform.valley{transform:translate(-50%,-50%) rotate(24deg);background:linear-gradient(90deg,transparent,rgba(72,122,147,.20),transparent);border-radius:999px}
.fallback-grid-line{position:absolute;z-index:1;background:rgba(36,77,64,.20);pointer-events:none}.fallback-grid-line.v{top:0;bottom:0;width:1px}.fallback-grid-line.h{left:0;right:0;height:1px}.fallback-grid-label{position:absolute;z-index:2;padding:2px 5px;border-radius:999px;background:rgba(255,255,255,.78);color:#355247;font-size:10px;font-weight:700;white-space:nowrap;pointer-events:none}.fallback-grid-label.lon{top:8px;transform:translateX(-50%)}.fallback-grid-label.lat{left:8px;transform:translateY(-50%)}.fallback-center-label{position:absolute;z-index:2;right:10px;top:10px;padding:6px 9px;border-radius:999px;background:rgba(255,255,255,.86);color:#244d40;font-size:10px;font-weight:750;box-shadow:0 2px 8px rgba(0,0,0,.08);pointer-events:none}
.fallback-bbox{position:absolute;z-index:6;border:2px solid #176b4d;background:rgba(23,107,77,.12);box-shadow:0 0 0 9999px rgba(255,255,255,.12),0 8px 24px rgba(16,43,39,.12);cursor:move;pointer-events:auto;min-width:30px;min-height:30px}.fallback-bbox:hover{border-color:#0d5239;background:rgba(23,107,77,.16)}.bbox-handle{position:absolute;width:14px;height:14px;border:2px solid #fff;border-radius:50%;background:#176b4d;box-shadow:0 1px 5px rgba(0,0,0,.22)}.bbox-handle.nw{left:-8px;top:-8px;cursor:nwse-resize}.bbox-handle.ne{right:-8px;top:-8px;cursor:nesw-resize}.bbox-handle.sw{left:-8px;bottom:-8px;cursor:nesw-resize}.bbox-handle.se{right:-8px;bottom:-8px;cursor:nwse-resize}.bbox-label{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);padding:5px 8px;border-radius:999px;background:rgba(255,255,255,.86);color:#176b4d;font-size:10px;font-weight:800;white-space:nowrap;pointer-events:none;box-shadow:0 2px 8px rgba(0,0,0,.08)}
.fallback-marker{position:absolute;z-index:7;width:18px;height:18px;margin:-18px 0 0 -9px;border-radius:50% 50% 50% 0;background:#bf5147;border:2px solid #fff;box-shadow:0 2px 8px rgba(0,0,0,.25);transform:rotate(-45deg);pointer-events:none}.fallback-controls{position:absolute;z-index:8;top:10px;left:10px;display:grid;border:1px solid rgba(0,0,0,.18);border-radius:8px;overflow:hidden;background:#fff;box-shadow:0 2px 8px rgba(0,0,0,.12)}.fallback-controls button{width:34px;height:32px;border:0;border-bottom:1px solid #e1e5e2;background:#fff;font-size:18px;line-height:1;cursor:pointer}.fallback-controls button:last-child{border-bottom:0}.fallback-tip{position:absolute;z-index:8;left:10px;right:10px;bottom:10px;padding:7px 9px;border-radius:999px;background:rgba(21,53,47,.86);color:#fff;text-align:center;font-size:10px;pointer-events:none}
@media(max-width:720px){.selector-map{min-height:300px}.bbox-label{display:none}}
/* v6 true DEM + real basemap */
.fallback-tiles img.fallback-tile{position:absolute;z-index:0;width:256px;height:256px;user-select:none;-webkit-user-drag:none;image-rendering:auto}
.fallback-attribution{position:absolute;z-index:8;right:8px;bottom:8px;padding:3px 6px;border-radius:6px;background:rgba(255,255,255,.82);color:#40554e;font-size:9px;pointer-events:none}
.fallback-tip{bottom:30px}

/* v6.3 完整合并：紧凑 UI、干净地图、版权页脚 */
.app-shell{padding-top:calc(10px + var(--safe-top));padding-bottom:calc(22px + var(--safe-bottom))}.topbar{height:auto;margin-bottom:12px}.panel{padding:18px}.panel-heading{margin-bottom:16px}.simple-form{gap:14px}.form-step{padding:13px}.step-title{margin-bottom:10px}.field input,.field select{height:42px}.check-option{min-height:52px}.output-options .check-option{min-height:54px}.selector-map{height:315px;min-height:315px}.map-layer-row{margin:8px 0}.layer-options{margin-top:2px}.layer-option-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.fallback-landform,.fallback-marker{display:none!important}.fallback-tip{bottom:30px}.site-footer{max-width:1080px;margin:18px auto 0;padding:12px 4px 0;text-align:center;color:#77827a;font-size:11px;line-height:1.6}.site-footer small{display:block;font-size:10px;color:#8b958e}.brand-icon{background:#15352f;object-fit:cover}
@media(min-width:900px){.teacher-form{grid-template-columns:1.1fr .9fr}.teacher-form .form-step:first-child{grid-row:span 3}.teacher-form .form-step.full{grid-column:auto}.teacher-form .form-step:nth-child(4){grid-column:1/-1}.option-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.output-options .option-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.quick-buttons{grid-template-columns:repeat(7,1fr)}}
@media(max-width:720px){.selector-map{height:285px;min-height:285px}.layer-option-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.panel{padding:15px}.form-step{padding:11px}.option-grid,.output-options .option-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.brand h1{font-size:19px}}
@media(max-width:480px){.selector-map{height:255px;min-height:255px}.layer-option-grid,.option-grid,.output-options .option-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.check-option{padding:8px;gap:7px}.check-option strong{font-size:10.5px}.check-option small{font-size:8.5px}.workflow-tabs{display:none}.bbox-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.map-tools{grid-template-columns:1fr}.brand p{display:block;font-size:10px}}


/* v6.4 final merge fixes */
.fallback-landform,.fallback-marker{display:none!important}
.fallback-bbox{pointer-events:auto!important;cursor:move!important;z-index:9!important}
.bbox-handle{pointer-events:auto!important}
.fallback-center-label{background:rgba(255,255,255,.88);font-size:10px}
.brand-icon{background:#12382f;object-fit:cover}
.site-footer{max-width:1080px;margin:18px auto 0;padding:12px 4px 0;text-align:center;color:#6f7c74;font-size:11px;line-height:1.6}
.site-footer small{display:block;font-size:10px;color:#8a948e}
@media (min-width: 860px){.teacher-form{gap:12px}.form-step{padding:12px}.option-grid{gap:7px}.check-option{min-height:50px}.field input,.field select{height:40px}.selector-map{height:320px}.panel{padding:18px}}
@media (max-width: 720px){.workflow-tabs{grid-template-columns:repeat(2,1fr)}.layer-option-grid,.option-grid,.bbox-grid,.compact-grid,.map-tools{grid-template-columns:1fr}.selector-map{height:360px}.inline-action{grid-template-columns:1fr}.small-action{grid-template-columns:1fr}.quick-buttons{grid-template-columns:repeat(4,1fr)}}


/* v6.5：紧凑可读 UI、纸张嵌入式步骤、安装按钮、图层选择修复 */
.topbar{height:auto;min-height:62px;align-items:center}.install-tool{display:flex;align-items:center;gap:7px;min-height:42px;padding:0 11px;border:1px solid rgba(23,107,77,.18);border-radius:13px;background:rgba(255,255,255,.92);color:#15352f;box-shadow:0 6px 18px rgba(16,43,39,.08);cursor:pointer}.install-tool svg{width:20px;height:20px;stroke-width:2}.install-tool span{font-size:11px;font-weight:750;white-space:nowrap;color:#5e6b64}.workflow-tabs{gap:8px}.workflow-tabs span{position:relative;background:#fffdf8;border:1px solid rgba(196,182,145,.62);box-shadow:inset 0 1px 0 rgba(255,255,255,.8),0 3px 10px rgba(77,62,31,.06);color:#384a42;border-radius:11px;padding:9px 10px 9px 12px;font-size:13px;font-weight:800}.workflow-tabs span::before{content:"";position:absolute;left:6px;top:6px;bottom:6px;width:3px;border-radius:999px;background:#176b4d;opacity:.52}.form-step{padding:16px 16px 15px;border-radius:14px}.step-title{align-items:center}.step-title>span{width:34px;height:34px;border-radius:10px;background:linear-gradient(145deg,#fffdf8,#ece4cc);border:1px solid rgba(181,165,120,.7);color:#176b4d;box-shadow:inset 0 1px 0 rgba(255,255,255,.95),0 4px 10px rgba(50,39,18,.08);font-size:17px;font-weight:900}.step-title strong{font-size:17px}.step-title small{font-size:12px;line-height:1.45}.field label,.field legend{font-size:13px;color:#34483f}.field input,.field select{height:48px;font-size:16px;padding:0 13px}.field small{font-size:11px}.quick-buttons{gap:8px}.quick-buttons button{min-height:38px;padding:0 12px;font-size:13px;border-radius:10px}.check-option{min-height:68px;padding:12px 13px;border-radius:12px;align-items:center}.check-option input{width:20px;height:20px;accent-color:#176b4d}.check-option strong{font-size:14px}.check-option small{font-size:11px;line-height:1.35}.option-grid{gap:10px}.layer-option-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.selector-map{min-height:340px;border-radius:14px}.map-tools button,.inline-action button,.generate-button{font-size:14px}.bbox-grid{gap:9px}.source-badge,.complete-badge{font-size:12px}.site-footer{max-width:1080px;margin:24px auto 0;text-align:center;color:#53645c;font-size:12px;line-height:1.6}.site-footer div{font-weight:760;letter-spacing:.02em}.site-footer small{display:block;margin-top:2px;color:#7c8982;font-size:11px}.fallback-tip{font-size:11px}.fallback-attribution{bottom:5px;right:5px;font-size:9px;opacity:.82}.fallback-center-label{font-size:10px}
@media (max-width:720px){.app-shell{padding-left:12px;padding-right:12px}.brand h1{font-size:19px}.brand p{font-size:11px}.install-tool{padding:0 9px}.install-tool span{font-size:10px}.workflow-tabs{grid-template-columns:repeat(2,1fr)}.workflow-tabs span{font-size:12px;padding:8px 8px 8px 11px}.form-step{padding:14px 12px}.step-title>span{width:30px;height:30px;font-size:15px}.step-title strong{font-size:16px}.field input,.field select{height:46px;font-size:15px}.layer-option-grid,.option-grid{grid-template-columns:1fr}.check-option{min-height:62px}.selector-map{min-height:310px}.quick-buttons{grid-template-columns:repeat(3,1fr)}}
@media (min-width:900px){.teacher-form{gap:15px}.compact-grid{gap:12px}.panel{padding:20px}.input-panel{padding-bottom:18px}}
.check-option:has(input:checked){border-color:rgba(23,107,77,.42);background:linear-gradient(180deg,#ffffff,#f3f8f4);box-shadow:inset 0 0 0 1px rgba(23,107,77,.08)}