:root{--sender-bg: #0f1419;--sender-surface: #1a2332;--sender-fg: #e6edf3;--sender-muted: #8b9cad;--sender-link: #7cc4ff;--sender-border: #2d3a4d;--sender-warn: #f0b429;--sender-danger: #f85149}*,*:before,*:after{box-sizing:border-box}html,body{height:100%}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--sender-bg);color:var(--sender-fg);line-height:1.45}a{color:var(--sender-link)}button{font:inherit;cursor:pointer}input,textarea,select{font:inherit}