:root{--bg-main:#f8fafc;--bg-card:#fff;--bg-sidebar:#fff;--text-primary:#0f172a;--text-secondary:#64748b;--primary:#3b82f6;--primary-hover:#2563eb;--danger:#ef4444;--success-bg:#dcfce7;--success-text:#166534;--border-light:#e2e8f0;--border-radius-sm:6px;--border-radius-md:8px;--border-radius-lg:12px;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -2px #0000001a;--header-height:72px;--sidebar-width:260px}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-main);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}a{color:inherit;text-decoration:none}ul{list-style:none}.app-container{min-height:100vh;display:flex}.sidebar{width:var(--sidebar-width);background:var(--bg-sidebar);border-right:1px solid var(--border-light);flex-direction:column;padding:24px 0;display:flex}.main-content{flex-direction:column;flex:1;display:flex}.top-nav{height:var(--header-height);border-bottom:1px solid var(--border-light);background:var(--bg-card);color:var(--text-secondary);align-items:center;padding:0 32px;font-weight:500;display:flex}.top-nav strong{color:var(--text-primary);margin-left:8px}.page-content{flex:1;padding:32px;overflow-y:auto}.page-title{margin-bottom:24px;font-size:24px;font-weight:700}.card{background:var(--bg-card);border:1px solid var(--border-light);border-radius:var(--border-radius-lg);box-shadow:var(--shadow-sm);padding:24px}.btn{border-radius:var(--border-radius-md);cursor:pointer;border:none;justify-content:center;align-items:center;padding:10px 16px;font-size:14px;font-weight:500;transition:all .2s;display:inline-flex}.btn-primary{background-color:var(--primary);color:#fff}.btn-primary:hover{background-color:var(--primary-hover)}.btn-danger{background-color:var(--danger);color:#fff}.btn-outline{border:1px solid var(--border-light);color:var(--text-primary);background-color:#0000}.btn-outline:hover{background-color:var(--bg-main)}