:root{color-scheme:dark;--bg:#08151d;--pane:#0d1d26;--pane2:#122631;--pane3:#172e39;--mint:#55e5ca;--mint2:#a1f3e4;--text:#e6f0f2;--muted:#91a9b4;--line:#25404b;--red:#ff9e98;--amber:#f4c483;--radius:16px;font-family:Inter,-apple-system,BlinkMacSystemFont,"SF Pro Display","PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased;font-size:14px}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--bg);color:var(--text)}body{overscroll-behavior:none}button,input{font:inherit}button{cursor:pointer;touch-action:manipulation}button:disabled{opacity:.38;cursor:not-allowed}button:focus-visible,input:focus-visible{outline:2px solid var(--mint);outline-offset:2px}button:not(.tool){border:1px solid transparent;border-radius:10px;font-weight:650}a{color:var(--mint)}h1,h2,h3,p{margin-top:0}.app{min-height:100dvh;display:flex;flex-direction:column}.app[hidden],.gate[hidden],.modal-bg[hidden],[hidden]{display:none!important}
.topbar{height:76px;display:flex;align-items:center;justify-content:space-between;padding:0 clamp(16px,3vw,38px);border-bottom:1px solid var(--line);background:#0a1922}.top-brand{display:flex;align-items:center;gap:12px}.brand-mark,.brand-emblem{font-family:Georgia,serif;display:grid;place-items:center;color:var(--mint);border:1.5px solid #31796e;background:#102c30}.brand-mark{width:40px;height:40px;border-radius:11px;font-size:34px}.top-brand strong{display:block;letter-spacing:.12em;font-size:15px}.top-brand small{color:var(--muted);display:block;font-size:11px;margin-top:4px;letter-spacing:.045em}.status-stack{text-align:right;display:flex;align-items:center;gap:12px}.status-stack #app-version{font:700 10px ui-monospace,monospace;letter-spacing:.08em;color:#7c96a2}.conn{border:1px solid var(--line);font-size:11px;letter-spacing:.04em;color:var(--muted);padding:6px 9px;border-radius:30px}.conn.online{border-color:#27756b;color:var(--mint)}.conn.offline{border-color:#5b5e57;color:#e0c8a9}
.filebar{display:flex;align-items:center;gap:14px;padding:15px clamp(16px,3vw,38px);min-height:84px;border-bottom:1px solid var(--line)}.primary{background:var(--mint);color:#08201d;padding:12px 17px;white-space:nowrap}.primary:hover{background:var(--mint2)}.primary .symbol{font-size:19px;margin-right:8px;vertical-align:-1px}.file-meta{min-width:0;flex:1;display:flex;flex-direction:column;gap:5px}.file-meta strong{font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.file-meta span{color:var(--muted);font-size:11px;line-height:1.2}.icon-button{color:var(--muted);border:1px solid var(--line)!important;background:var(--pane);font-size:20px;min-width:42px;height:42px}.icon-button:hover{color:var(--text)}
.main{display:grid;grid-template-columns:minmax(0,1fr) 344px;gap:16px;padding:18px clamp(16px,3vw,38px);flex:1;min-height:0;max-width:1800px;width:100%;margin:0 auto}.drawing-panel{border:1px solid var(--line);border-radius:var(--radius);background:#0b1922;display:flex;flex-direction:column;min-width:0;height:calc(100dvh - 196px);min-height:480px;overflow:hidden}.canvas-topline,.canvas-footer{height:46px;flex-shrink:0;display:flex;align-items:center;justify-content:space-between;padding:0 17px;background:var(--pane);gap:10px}.canvas-topline{border-bottom:1px solid var(--line)}.canvas-footer{border-top:1px solid var(--line)}.paper-id{font-size:11px;color:#c7d9de;display:flex;align-items:center;gap:8px;min-width:0}.paper-id span:last-child{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.live-dot{width:7px;height:7px;background:var(--mint);border-radius:50%;box-shadow:0 0 10px #36daba55;flex-shrink:0}.zoom-tools,.page-nav{display:flex;align-items:center;gap:10px}.zoom-tools button,.page-nav button{background:#17313c;color:var(--text);height:30px;min-width:32px;border:1px solid var(--line);border-radius:8px;font-size:20px;line-height:1}.zoom-tools span,.page-nav span{color:var(--muted);font:600 11px ui-monospace,monospace;min-width:46px;text-align:center}.page-nav span{min-width:56px}.canvas-footer #scale-caption{color:var(--muted);font-size:10.5px;line-height:1.25;text-align:right}
.viewer{position:relative;flex:1;min-height:0;overflow:hidden;touch-action:none;user-select:none;background-color:#0b1922;background-image:radial-gradient(#2a424e 0.7px, transparent 0.7px);background-size:18px 18px;cursor:grab}.viewer.measuring{cursor:crosshair}.viewer:active{cursor:grabbing}.page-wrap{position:absolute;top:0;left:0;transform-origin:top left;will-change:transform;box-shadow:0 6px 38px #01070baa;background:white}.page-wrap canvas{display:block}.page-wrap svg{position:absolute;inset:0;width:100%;height:100%;overflow:visible;pointer-events:none}.floating-help{position:absolute;bottom:18px;left:50%;transform:translateX(-50%);border:1px solid #4a8378;color:#e0fcf4;background:#103c39ed;backdrop-filter:blur(8px);border-radius:99px;padding:10px 15px;text-align:center;font-size:11px;white-space:nowrap;max-width:calc(100% - 16px);overflow:hidden;text-overflow:ellipsis;pointer-events:none}
.empty-screen{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:25px}.empty-art{height:110px;width:150px;position:relative;display:grid;place-items:center;margin-bottom:4px}.empty-art span{color:var(--mint);font-size:102px;font-family:Georgia,serif;font-weight:200;line-height:1}.empty-art>div{position:absolute;border:1px dashed #5b9a9c;width:90px;height:90px;transform:rotate(45deg);opacity:.6}.empty-screen h2{font-weight:700;letter-spacing:.025em;font-size:20px;margin:22px 0 10px}.empty-screen p{color:var(--muted);line-height:1.8;font-size:12px;margin-bottom:24px}.subtle-btn{background:#17343b;color:var(--mint);border-color:#2f6769!important;padding:12px 16px}
.sidebar{min-width:0;max-height:calc(100dvh - 196px);overflow-y:auto;scrollbar-width:thin;scrollbar-color:#274550 transparent;padding:5px 2px 28px}.section-head,.records-title{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:16px}.section-head h2{font-size:18px;margin:6px 0 0}.section-head h3,.records-title h3{margin:0;font-size:13px}.eyebrow{color:var(--mint);font:700 10px ui-monospace,SFMono-Regular,monospace;letter-spacing:.18em}.secondary{background:var(--pane2);color:#d7e8e9;border:1px solid var(--line)!important;padding:10px 12px}.small{font-size:11px;padding:7px 12px}.tools-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:14px}.tool{border:1px solid #28444e;background:#0f212b;color:#b9ced4;border-radius:12px;min-height:83px;padding:10px 6px;display:flex;align-items:center;justify-content:center;gap:9px;flex-direction:column;font-size:11px;font-weight:650}.tool:hover{border-color:#4e7d7c}.tool.active{background:#123c3a;border-color:#4bd9bc;color:var(--mint2);box-shadow:inset 0 0 0 1px #4bd9bc22}.tool-icon{font-family:Georgia,serif;font-size:27px;line-height:1;font-weight:400}
.measure-card{padding:18px;background:linear-gradient(145deg,#16323b,#102832);border:1px solid #2c555a;border-radius:15px;margin-bottom:22px}.measure-kicker{color:#a8c2c9;font-size:11px;display:flex;justify-content:space-between;gap:8px}.measure-kicker span{color:var(--mint)}.measure-number{font:600 clamp(29px,3vw,42px) ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:-.06em;margin:13px 0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.measure-number small{font-size:15px;letter-spacing:0;color:var(--mint)}.measure-explain{font-size:12px;color:#c4d7dd;line-height:1.65;min-height:38px}.hint{font-size:11px;color:#80abb1;margin-top:14px;padding-top:11px;border-top:1px solid #305157;line-height:1.45}.compact{margin-bottom:9px}.chip{font:11px ui-monospace,monospace;color:#92b4b9;background:#173038;padding:6px 9px;border-radius:7px}.diagnostics{border:1px solid var(--line);border-radius:11px;padding:12px;background:#0c1e27;margin-bottom:22px;font-size:11px;line-height:1.65;color:#9eb6be}.diagnostics p{margin:0 0 5px}.diagnostics p:last-child{margin-bottom:0}.diagnostics .warn{color:var(--amber)}.diagnostics .error{color:var(--red)}.records-title{margin-bottom:11px}.records-title span{font-size:11px;color:var(--muted)}.records{display:flex;flex-direction:column;gap:7px}.record-empty{border:1px dashed #31515c;color:#819da6;border-radius:10px;text-align:center;padding:18px 6px;font-size:11px}.record{display:flex;justify-content:space-between;align-items:center;background:var(--pane);border:1px solid var(--line);border-radius:10px;padding:10px 11px;gap:10px}.record strong{font-size:11px}.record .record-sub{font-size:10px;color:var(--muted);margin-top:5px}.record .record-val{color:var(--mint);font:700 13px ui-monospace,monospace;white-space:nowrap}.privacy{font-size:10px;line-height:1.7;color:#6e8b95;text-align:center;margin-top:22px}.privacy #offline-ready{color:#a6c7c5}
.gate{position:fixed;inset:0;z-index:100;background:radial-gradient(ellipse at 50% 25%,#174341 0%,#08151d 54%);display:grid;place-items:center;padding:22px;overflow:auto}.gate-card{width:min(440px,100%);border:1px solid #315358;background:linear-gradient(165deg,#112831f5,#0b1b24f7);border-radius:22px;box-shadow:0 28px 110px #0008;padding:clamp(25px,5vw,42px)}.brand-emblem{width:62px;height:62px;border-radius:16px;font-size:51px;margin-bottom:28px}.gate h1{font-size:31px;letter-spacing:.025em;margin:10px 0 12px}.muted{color:var(--muted);font-size:12px;line-height:1.9}.gate label,.modal label{display:block;font-size:11px;font-weight:650;margin:22px 0 9px;color:#c3d7dc}.gate input,.modal input{width:100%;background:#08171e;border:1px solid #34545d;color:#edf8fa;border-radius:10px;padding:15px;outline:0;letter-spacing:.04em}.gate input:focus,.modal input:focus{border-color:var(--mint)}.gate .large{width:100%;margin-top:14px;padding:15px;display:flex;justify-content:space-between}.notice{font-size:11px;color:#c7d5c8;line-height:1.7;border:1px solid #304c4d;background:#0d282c;border-radius:8px;padding:11px;margin-top:20px}.notice.error{color:var(--red);border-color:#784b4b;background:#342123}.gate-foot{font-size:10px;color:#76949e;line-height:1.65;margin-top:26px}.modal-bg{position:fixed;z-index:90;inset:0;background:#020b0bcc;display:grid;place-items:center;padding:20px}.modal{background:#11232e;border:1px solid #355c63;padding:25px;border-radius:18px;width:min(420px,100%)}.modal h2{font-size:19px;margin:9px 0 14px}.modal p{font-size:12px;line-height:1.7;color:var(--muted)}.modal-actions{display:flex;gap:9px;justify-content:flex-end;margin-top:20px}.toast{position:fixed;bottom:calc(23px + env(safe-area-inset-bottom));left:50%;transform:translateX(-50%);background:#163536;border:1px solid #3b8a7b;box-shadow:0 9px 30px #000a;color:#d6faf2;padding:11px 16px;border-radius:9px;max-width:90%;min-width:190px;text-align:center;font-size:12px;line-height:1.5;z-index:110;pointer-events:none}
@media(max-width:1000px){.main{grid-template-columns:minmax(0,1fr) 290px;gap:11px;padding:12px 16px}.drawing-panel,.sidebar{height:calc(100dvh - 176px);max-height:calc(100dvh - 176px)}.filebar{min-height:78px}.tools-grid{grid-template-columns:repeat(2,1fr)}.tool{min-height:70px;gap:6px}}
@media(max-width:720px){.topbar{height:60px;padding:0 15px}.brand-mark{width:34px;height:34px;font-size:29px}.top-brand strong{font-size:12px}.top-brand small{font-size:9.5px}.status-stack #app-version{display:none}.conn{font-size:10px}.filebar{min-height:70px;padding:9px 12px;gap:10px}.filebar .primary{font-size:11px;padding:10px;min-height:43px}.filebar .primary .symbol{font-size:15px;margin-right:3px}.file-meta strong{font-size:11px}.file-meta span{font-size:9px}.icon-button{min-width:36px;height:40px}.main{display:flex;flex-direction:column;gap:12px;padding:10px 10px 60px}.drawing-panel{width:100%;height:clamp(335px,51dvh,590px);min-height:335px;max-height:initial;flex-shrink:0}.sidebar{height:auto;max-height:none;padding:4px 1px}.canvas-topline,.canvas-footer{height:40px;padding:0 10px}.canvas-footer #scale-caption{font-size:9px}.zoom-tools{gap:5px}.zoom-tools span{font-size:10px}.tools-grid{grid-template-columns:repeat(3,1fr)}.tool{min-height:65px;font-size:11px}.tool-icon{font-size:24px}.measure-number{font-size:36px}.section-head h2{font-size:17px}.floating-help{font-size:10px}}
@media(max-width:360px){.filebar{gap:7px}.file-meta span{display:none}.filebar .primary{font-size:10px;padding:8px}.tools-grid{gap:6px}.tool{font-size:10px}.canvas-footer #scale-caption{max-width:190px}}