:root{--primary: #00e676;--secondary: #2979ff;--bg: #121212;--surface: #1e1e1e;--text: #ffffff;--text-secondary: #b0b0b0;--danger: #ff1744}body{margin:0;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:var(--bg);color:var(--text)}*{box-sizing:border-box}button{cursor:pointer;border:none;border-radius:8px;padding:10px 20px;font-weight:600;transition:all .2s ease}button:active{transform:scale(.98)}.btn-primary{background:var(--primary);color:#000}.btn-secondary{background:var(--surface);color:var(--primary);border:1px solid var(--primary)}.btn-danger{background:var(--danger);color:#fff}.container{max-width:100%;margin:0 auto;padding:20px;min-height:100vh;display:flex;flex-direction:column}.card{background:var(--surface);border-radius:16px;padding:20px;margin-bottom:20px;box-shadow:0 4px 20px #0000004d}input[type=text],input[type=number],input[type=file]{width:100%;padding:12px;background:#2c2c2c;border:1px solid #333;border-radius:8px;color:#fff;margin-bottom:10px}h1,h2,h3{margin-top:0}.camera-container{position:relative;width:100%;overflow:hidden;border-radius:16px;background:#000}video{width:100%;height:auto;display:block}canvas{position:absolute;top:0;left:0;width:100%;height:100%}.overlay-controls{position:absolute;bottom:20px;left:0;width:100%;display:flex;justify-content:center;gap:20px;z-index:10}.capture-btn{width:70px;height:70px;border-radius:50%;background:#fff;border:4px solid rgba(255,255,255,.3);box-shadow:0 0 20px #00000080}.nav-bar{display:flex;justify-content:space-around;background:var(--surface);padding:15px;position:fixed;bottom:0;left:0;width:100%;z-index:100;border-top:1px solid #333}.nav-item{color:var(--text-secondary);text-decoration:none;font-size:14px;display:flex;flex-direction:column;align-items:center}.nav-item.active{color:var(--primary)}.measure-label{background:#000000b3;color:#fff;padding:2px 5px;border-radius:4px;font-size:12px;pointer-events:none}