:root{--color-primary:#34495e;--color-background:#fff;--color-surface:#f5f6f7;--color-border:#ddd;--color-text:#222;--color-text-muted:#777}*{box-sizing:border-box}body{background-color:var(--color-background);color:var(--color-text);margin:0;line-height:1.5}h1,h2,h3{color:var(--color-primary)}a{color:var(--color-primary);text-decoration:none}a:hover{text-decoration:underline}table{border-collapse:collapse;text-align:center;width:100%}th,td{text-align:center;border-bottom:1px solid var(--color-border);padding:10px 14px}thead th{background-color:var(--color-surface);font-weight:600}tbody tr:hover{background-color:var(--color-surface)}input,select{border:1px solid var(--color-border);color:var(--color-text);border-radius:4px;padding:6px 10px;font-family:inherit;font-size:14px}input::placeholder{color:var(--color-text-muted)}form{flex-direction:column;gap:12px;max-width:500px;margin-top:16px;display:flex}form label{flex-direction:column;gap:4px;font-weight:500;display:flex}form input,form select{width:100%}select[multiple]{min-height:120px;padding:6px}select[multiple] option{border-radius:3px;padding:6px 8px}select[multiple] option:checked{background-color:var(--color-primary);color:#fff}form button[type=submit]{align-self:flex-start;margin-top:8px}button{background-color:var(--color-primary);color:#fff;cursor:pointer;border:none;border-radius:4px;padding:8px 16px;font-size:14px;transition:background-color .15s}button:hover{background-color:#2c3e50}nav{background-color:#2c3e50;align-items:center;gap:1rem;padding:1rem 1.5rem;display:flex}nav a{color:#ecf0f1;border-radius:4px;padding:.5rem 1rem;font-weight:500;text-decoration:none;transition:background-color .15s}nav a:hover{background-color:#34495e}nav a.active{color:#fff;background-color:#1abc9c}.app-container{max-width:1200px;margin:0 auto;padding:24px}