:root{--color-primary: #173B6C;--color-primary-dark: #0F284D;--color-accent: #F2A71B;--color-success: #2E7D50;--color-danger: #B3261E;--color-text: #1A1A1A;--color-text-muted: #5B6472;--color-bg: #F5F6F8;--color-surface: #FFFFFF;--color-border: #E1E4E8;--font-stack: "Segoe UI", Roboto, Arial, sans-serif}*{box-sizing:border-box}body{margin:0;font-family:var(--font-stack);background:var(--color-bg);color:var(--color-text)}a{color:var(--color-primary)}.app-shell{display:flex;min-height:100vh}.app-nav{width:220px;background:var(--color-primary);color:#fff;padding:24px 16px;flex-shrink:0}.app-nav a{display:block;color:#fff;text-decoration:none;padding:10px 0;opacity:.85}.app-nav a:hover{opacity:1}.app-main{flex:1;padding:32px;max-width:1100px}.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:8px;padding:24px;margin-bottom:24px}.btn{background:var(--color-accent);color:var(--color-text);border:none;border-radius:6px;padding:10px 20px;font-weight:700;cursor:pointer}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:transparent;border:1px solid var(--color-primary);color:var(--color-primary)}table{width:100%;border-collapse:collapse}th,td{text-align:left;padding:8px 12px;border-bottom:1px solid var(--color-border)}.gap-positive{color:var(--color-success)}.gap-negative{color:var(--color-danger)}