:root {
    --primary: #6366f1; /* Modern Indigo */
    --bg-light: #f8fafc;
    --text-main: #1e293b;
    --sidebar-bg: #ffffff;
    --border: #e2e8f0;
}

body { 
    font-family: 'Inter', system-ui, sans-serif; 
    margin: 0; 
    display: flex; 
    height: 100vh; 
    background: var(--bg-light); 
    color: var(--text-main);
}

/* Sidebar - Modern White */
.sidebar { 
    width: 260px; 
    background: var(--sidebar-bg); 
    border-right: 1px solid var(--border);
    height: 100%; 
    position: fixed; 
}
.sidebar h2 { 
    padding: 30px 24px; 
    font-size: 20px; 
    font-weight: 800; 
    color: var(--primary); 
    margin: 0; 
    letter-spacing: -0.5px;
}
.sidebar ul { list-style: none; padding: 0 16px; margin: 0; }
.sidebar .section-title { 
    font-size: 11px; 
    text-transform: uppercase; 
    letter-spacing: 1px; 
    color: #94a3b8; 
    padding: 20px 10px 10px; 
}
.sidebar ul li a { 
    display: flex; 
    align-items: center;
    padding: 12px 16px; 
    color: #64748b; 
    text-decoration: none; 
    border-radius: 8px;
    margin-bottom: 4px;
    transition: 0.2s;
}
.sidebar ul li a:hover { background: #f1f5f9; color: var(--primary); }

/* Main Content area */
.main-content { margin-left: 260px; width: calc(100% - 260px); }
.top-bar { 
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    padding: 15px 40px; 
    border-bottom: 1px solid var(--border);
    display: flex; 
    justify-content: space-between; 
    position: sticky; top: 0; z-index: 10;
}

.content-area { padding: 40px; }

/* Modern Cards */
.card { 
    background: #fff; 
    padding: 30px; 
    border-radius: 16px; 
    border: 1px solid var(--border);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

/* Modern Inputs */
input, select { 
    padding: 12px; 
    margin: 8px 0 20px; 
    width: 100%; 
    border: 1px solid var(--border); 
    border-radius: 10px; 
    background: #fcfcfd;
}
button { 
    background: var(--primary); 
    color: white; 
    border: none; 
    padding: 12px 24px; 
    font-weight: 600;
    cursor: pointer; 
    border-radius: 10px; 
    transition: 0.3s;
}
button:hover { opacity: 0.9; transform: translateY(-1px); }