:root{--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;--font-size-small: .875rem;--font-size-normal: 1rem;--font-size-medium: 1.125rem;--font-size-large: 1.25rem;--font-size-xl: 1.5rem;--font-size-xxl: 2rem;--border-radius-sm: .25rem;--border-radius-md: .5rem;--border-radius-lg: .75rem;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-xxl: 3rem;--box-shadow: 0 4px 6px rgba(0, 0, 0, .1);--box-shadow-lg: 0 10px 15px rgba(0, 0, 0, .1)}@keyframes pulse{0%{opacity:1;transform:scaleX(1)}50%{opacity:.8;transform:scaleX(1.02)}to{opacity:1;transform:scaleX(1)}}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font-family);font-size:var(--font-size-normal);line-height:1.5}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.2;margin-bottom:var(--spacing-md)}h1{font-size:var(--font-size-xxl)}h2{font-size:var(--font-size-xl)}h3{font-size:var(--font-size-large)}a{color:#1976d2;text-decoration:none}a:hover{text-decoration:underline}.app-container{display:flex;flex-direction:column;min-height:100vh}.app-header{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing-md) var(--spacing-xl);background-color:#fff;box-shadow:var(--box-shadow);position:sticky;top:0;z-index:10}.app-content{display:flex;flex:1}.sidebar{width:250px;background-color:#fff;padding:var(--spacing-lg);border-right:1px solid #e9ecef}.main-content{flex:1;padding:var(--spacing-xl);background-color:#f8f9fa}.app-footer{padding:var(--spacing-lg) var(--spacing-xl);background-color:#fff;border-top:1px solid #e9ecef;text-align:center}.main-nav ul,.sidebar-nav ul{display:flex;list-style:none}.main-nav ul{gap:var(--spacing-lg)}.sidebar-nav ul{flex-direction:column;gap:var(--spacing-md)}.sidebar-nav a{display:block;padding:var(--spacing-sm) 0;color:#495057}.sidebar-nav a:hover{color:var(--primary-color);text-decoration:none}.page-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-xl)}.stats-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:var(--spacing-lg);margin-bottom:var(--spacing-xl)}.stat-card{background-color:#fff;border-radius:var(--border-radius-md);padding:var(--spacing-lg);box-shadow:var(--box-shadow)}.stat-value{font-size:var(--font-size-xxl);font-weight:700;margin:var(--spacing-sm) 0;color:var(--primary-color)}.stat-progress{margin-top:var(--spacing-md)}.progress-bar{height:8px;background-color:var(--primary-color);border-radius:4px;margin-bottom:var(--spacing-xs)}.activity-list{display:flex;flex-direction:column;gap:var(--spacing-md)}.activity-item{display:flex;gap:var(--spacing-md);padding:var(--spacing-md);background-color:#fff;border-radius:var(--border-radius-md);box-shadow:var(--box-shadow)}.activity-icon{color:var(--primary-color)}.activity-title{font-weight:600}.activity-time{color:#adb5bd;font-size:var(--font-size-small);margin-top:var(--spacing-xs)}.loading-state{display:flex;justify-content:center;align-items:center;padding:var(--spacing-xl);color:#6c757d}@media(max-width:768px){.app-content{flex-direction:column}.sidebar{width:100%;border-right:none;border-bottom:1px solid #e9ecef}.stats-cards{grid-template-columns:1fr}}