:root{--bg: #0f1419;--surface: #1a2332;--border: #2d3a4d;--text: #e6edf3;--muted: #8b949e;--accent: #58a6ff;--success: #3fb950;--danger: #f85149;--radius: 10px;--font: "Segoe UI", system-ui, sans-serif}*{box-sizing:border-box}body{margin:0;font-family:var(--font);background:var(--bg);color:var(--text);min-height:100vh;line-height:1.5}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}input,select,button,textarea{font-family:inherit;font-size:1rem}button{cursor:pointer}.container{max-width:720px;margin:0 auto;padding:1.5rem}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem;margin-bottom:1rem}.form-group{margin-bottom:1rem}.form-group label{display:block;margin-bottom:.35rem;color:var(--muted);font-size:.9rem}.form-group input,.form-group select{width:100%;padding:.6rem .75rem;border:1px solid var(--border);border-radius:8px;background:var(--bg);color:var(--text)}.form-group input:focus,.form-group select:focus{outline:none;border-color:var(--accent)}.btn{padding:.6rem 1.2rem;border-radius:8px;border:none;font-weight:600;transition:opacity .2s}.btn:hover{opacity:.9}.btn-primary{background:var(--accent);color:#fff}.btn-secondary{background:var(--border);color:var(--text)}.btn-danger{background:var(--danger);color:#fff}.error-msg{color:var(--danger);font-size:.9rem;margin-top:.25rem}.nav{display:flex;align-items:center;justify-content:space-between;padding:1rem 1.5rem;border-bottom:1px solid var(--border);background:var(--surface)}.nav h1{margin:0;font-size:1.25rem}.nav-right{display:flex;align-items:center;gap:1rem}.table-wrap{overflow-x:auto}table{width:100%;border-collapse:collapse}th,td{padding:.6rem .75rem;text-align:left;border-bottom:1px solid var(--border)}th{color:var(--muted);font-weight:600;font-size:.85rem}.empty{color:var(--muted);text-align:center;padding:2rem}.success-toast{background:var(--success);color:#fff;padding:.75rem 1rem;border-radius:8px;margin-bottom:1rem}.phone-input{font-variant-numeric:tabular-nums}